Forecast Discussions mentioning any of
"HRRR" "RAP" "RR" "RUC13" "RUC" received at GSD on 03/14/14
AREA FORECAST DISCUSSION
NWS SAN JOAQUIN VALLEY - HANFORD CA
250 PM PDT WED MAR 12 2014
.UPDATE...
ADDED SLIGHT CHANCE OF SHOWERS TO THE SOUTHERN SIERRA NEVADA THIS
AFTERNOON AND EVENING.
&&
.SYNOPSIS...
FEW CLOUDS AND ABOVE NORMAL TEMPERATURES ARE EXPECTED THROUGH
MONDAY. AFTERNOONS WILL BE WARMEST SUNDAY AND MONDAY AND WILL
APPROACH RECORD LEVELS IN THE SAN JOAQUIN VALLEY AND NEARBY
FOOTHILLS. A WEAK LOW PRESSURE SYSTEM WILL APPROACH TUESDAY PUSHING
TEMPERATURES BACK DOWN BUT STILL REMAINING ABOVE NORMAL.
&&
.DISCUSSION...
UPSLOPE CLOUDS HAVE DEVELOPED OVER THE EAST SLOPES OF THE
SOUTHERN SIERRA NEVADA THIS AFTERNOON DUE TO FAVORABLE OROGRAPHICS
IN THE EASTERLY FLOW ALOFT. CUMULUS CLOUDS HAVE SPILLED OVER THE
CREST INTO THE HIGH COUNTRY...AND HANFORD DOPPLER RADAR HAS
DETECTED POSSIBLE ISOLATED SHOWERS NEAR GIANT FOREST. PER
DISCUSSION WITH WFO LAS VEGAS...HAVE ADDED A SLIGHT CHANCE OF
SHOWERS OVER THE HIGH COUNTRY IN FRESNO AND NORTHERN TULARE
COUNTIES FOR THE REMAINDER OF THIS AFTERNOON AND THIS EVENING.
&&
.AVIATION...
WINDS WILL BE DECREASING ACROSS THE REGION THIS AFTERNOON AND BY 03Z
WILL BE PRIMARILY TERRAIN DRIVEN. NON IMPACTFUL WINDS EXPECTED
THURSDAY ALL AREAS. FEW TO SCT CLOUDS NEAR 10KFT AND LOCALIZED MVFR
CEILINGS IN THE SIERRA MOUNTAINS AND FOOTHILLS DURING THE AFTERNOON
HOURS.
&&
.PREV DISC... /ISSUED 126 PM PDT WED MAR 12 2014/
DISCUSSION...
WIND EVENT IS QUICKLY WINDING DOWN ACROSS OUR FORECAST AREA PRETTY
MUCH AS EXPECTED. ISOLATED ADVISORY LEVEL GUST STILL POSSIBLE
THROUGH 2 PM BUT THE TREND IS DEFINITELY DOWN FOR THE REST OF THE
AFTERNOON PER HRRR WIND GRIDS AND MODELED MASS/THERMAL FIELDS.
PEAK WIND GUSTS WERE NEAR 50 MPH IN YOSEMITE NP AND IN THE 50S
THROUGH THE PASSES OF CENTRAL KERN COUNTY. OTHER INTERESTING
FEATURE WAS PATCH OF MID CLOUDS THAT DEVELOPED THIS MORNING AND
ARE STILL IN THE PROCESS OF DECAYING. THIS WAS LIKELY DUE TO
STRONG EASTERLY FLOW JUST ABOVE THE STABLE LAYER OVER THE SJV
CAUSING ENOUGH UPWARD MOVEMENT TO SATURATE THE AIR PARCELS.
REALLY GOOD AGREEMENT BETWEEN DETERMINISTIC/ENSEMBLE DATA THROUGH
THE WEEKEND AS H5 RIDGE POPS OVER CALIFORNIA. CENTRAL HEIGHTS VARY
BUT TIME-AVERAGED DETERMINISTIC GFS PEAKS AT ABOUT 586DM WHICH IS
ABOUT 2 STANDARD DEVIATIONS ABOVE CLIMO. THERMAL FIELDS SHOW
PERTURBATIONS OF SIMILAR STRENGTH ALL PEAKING SUNDAY /WITH LASTING
EFFECTS INTO MONDAY/. LOCAL BIAS-CORRECTED DATA SUGGEST WIDESPREAD
80S ARE IN THE CARDS FOR THE SJV AND LOWER FOOTHILLS SUN-MON WITH
SOME 90S EVEN POSSIBLE. THIS IS WELL ABOVE NORMAL /UPPER 60S/ AND
APPROACHING RECORD VALUES /SEE WEATHER STORY GRAPHIC ON OUR
WEBSITE/.
FOR NOW IT APPEARS THE SPRING HEAT WILL BE SHORT LIVED AS A WEAK
SHORTWAVE WILL IMPINGE ON THE WESTERN PERIPHERY OF THE ANTI-CYCLONE
AND NUDGE IT EASTWARD. QUITE A BIT OF SPREAD IN THE MODEL DATA FOR
THIS SHORTWAVE REGARDING STRENGTH/TIMING...THOUGH THAT ISN/T
UNUSUAL FOR SOMETHING SEVEN DAYS OUT. MEAN ENSEMBLE DATA HOWEVER
DO SUPPORT A TROUGH COMING IN MID-WEEK WHICH WILL SUPPRESS
TEMPERATURES A BIT /THOUGH STILL ABOVE AVERAGE/ AND BRING ABOUT A
SLIGHT CHANCE OF PRECIPITATION /OPTED FOR NEAR CLIMO POPS/. FWIW
THE DETERMINISTIC GFS IS TRENDING A LITTLE DEEPER WITH THE SYSTEM
WHILE THE TIMING HAS REMAINED FAIRLY STEADY. REGARDLESS IT DOESN/T
LOOK LIKE A LARGE PRECIP MAKER AT ALL.
&&
.AIR QUALITY ISSUES...
NONE.
&&
.CERTAINTY...
THE LEVEL OF CERTAINTY FOR DAYS 1 AND 2 IS HIGH.
THE LEVEL OF CERTAINTY FOR DAYS 3 THROUGH 7 IS HIGH.
THIS INFORMATION IS PROVIDED AS PART OF A TRIAL PROJECT CONDUCTED
BY THE NATIONAL WEATHER SERVICE SAN JOAQUIN VALLEY - HANFORD.
CERTAINTY LEVELS INCLUDE LOW...MEDIUM...AND HIGH. PLEASE VISIT
WWW.WEATHER.GOV/HNX/CERTAINTY.PHP /ALL LOWER CASE/ FOR ADDITIONAL
INFORMATION AND/OR TO PROVIDE FEEDBACK.
&&
.CLIMATE...
RECORDS
SITE DATE HI_MAX:YEAR LO_MAX:YEAR HI_MIN:YEAR LO_MIN:YEAR
KFAT 03-12 84:1910 50:1952 55:2005 28:1950
KFAT 03-13 84:2007 53:1981 59:1932 31:1950
KFAT 03-14 83:2007 48:1975 55:1995 29:1944
KBFL 03-12 88:1910 51:2006 56:1979 25:1907
KBFL 03-13 88:2007 53:1969 59:1979 21:1907
KBFL 03-14 88:1916 53:1944 62:1900 28:1907
&&
.HNX WATCHES/WARNINGS/ADVISORIES...
NONE.
&&
$$
PUBLIC...SANGER
AVN/FW...INIGUEZ
PREV DISCUSSION...INIGUEZ
SYNOPSIS...INIGUEZ
WEATHER.GOV/HANFORD
AREA FORECAST DISCUSSION
NWS SAN JOAQUIN VALLEY - HANFORD CA
126 PM PDT WED MAR 12 2014
.SYNOPSIS...
FEW CLOUDS AND ABOVE NORMAL TEMPERATURES ARE EXPECTED THROUGH
MONDAY. AFTERNOONS WILL BE WARMEST SUNDAY AND MONDAY AND WILL
APPROACH RECORD LEVELS IN THE SAN JOAQUIN VALLEY AND NEARBY
FOOTHILLS. A WEAK LOW PRESSURE SYSTEM WILL APPROACH TUESDAY PUSHING
TEMPERATURES BACK DOWN BUT STILL REMAINING ABOVE NORMAL.
&&
.DISCUSSION...
WIND EVENT IS QUICKLY WINDING DOWN ACROSS OUR FORECAST AREA PRETTY
MUCH AS EXPECTED. ISOLATED ADVISORY LEVEL GUST STILL POSSIBLE
THROUGH 2 PM BUT THE TREND IS DEFINITELY DOWN FOR THE REST OF THE
AFTERNOON PER HRRR WIND GRIDS AND MODELED MASS/THERMAL FIELDS.
PEAK WIND GUSTS WERE NEAR 50 MPH IN YOSEMITE NP AND IN THE 50S
THROUGH THE PASSES OF CENTRAL KERN COUNTY. OTHER INTERESTING
FEATURE WAS PATCH OF MID CLOUDS THAT DEVELOPED THIS MORNING AND
ARE STILL IN THE PROCESS OF DECAYING. THIS WAS LIKELY DUE TO
STRONG EASTERLY FLOW JUST ABOVE THE STABLE LAYER OVER THE SJV
CAUSING ENOUGH UPWARD MOVEMENT TO SATURATE THE AIR PARCELS.
REALLY GOOD AGREEMENT BETWEEN DETERMINISTIC/ENSEMBLE DATA THROUGH
THE WEEKEND AS H5 RIDGE POPS OVER CALIFORNIA. CENTRAL HEIGHTS VARY
BUT TIME-AVERAGED DETERMINISTIC GFS PEAKS AT ABOUT 586DM WHICH IS
ABOUT 2 STANDARD DEVIATIONS ABOVE CLIMO. THERMAL FIELDS SHOW
PERTURBATIONS OF SIMILAR STRENGTH ALL PEAKING SUNDAY /WITH LASTING
EFFECTS INTO MONDAY/. LOCAL BIAS-CORRECTED DATA SUGGEST WIDESPREAD
80S ARE IN THE CARDS FOR THE SJV AND LOWER FOOTHILLS SUN-MON WITH
SOME 90S EVEN POSSIBLE. THIS IS WELL ABOVE NORMAL /UPPER 60S/ AND
APPROACHING RECORD VALUES /SEE WEATHER STORY GRAPHIC ON OUR
WEBSITE/.
FOR NOW IT APPEARS THE SPRING HEAT WILL BE SHORT LIVED AS A WEAK
SHORTWAVE WILL IMPINGE ON THE WESTERN PERIPHERY OF THE ANTI-CYCLONE
AND NUDGE IT EASTWARD. QUITE A BIT OF SPREAD IN THE MODEL DATA FOR
THIS SHORTWAVE REGARDING STRENGTH/TIMING...THOUGH THAT ISN/T
UNUSUAL FOR SOMETHING SEVEN DAYS OUT. MEAN ENSEMBLE DATA HOWEVER
DO SUPPORT A TROUGH COMING IN MID-WEEK WHICH WILL SUPPRESS
TEMPERATURES A BIT /THOUGH STILL ABOVE AVERAGE/ AND BRING ABOUT A
SLIGHT CHANCE OF PRECIPITATION /OPTED FOR NEAR CLIMO POPS/. FWIW
THE DETERMINISTIC GFS IS TRENDING A LITTLE DEEPER WITH THE SYSTEM
WHILE THE TIMING HAS REMAINED FAIRLY STEADY. REGARDLESS IT DOESN/T
LOOK LIKE A LARGE PRECIP MAKER AT ALL.
&&
.AVIATION...
WINDS WILL BE DECREASING ACROSS THE REGION THIS AFTERNOON AND BY 03Z
WILL BE PRIMARILY TERRAIN DRIVEN. NON IMPACTFUL WINDS EXPECTED
THURSDAY ALL AREAS. FEW TO SCT CLOUDS NEAR 10KFT AND LOCALIZED MVFR
CEILINGS IN THE SIERRA MOUNTAINS AND FOOTHILLS DURING THE AFTERNOON
HOURS.
&&
.AIR QUALITY ISSUES...
NONE.
&&
.CERTAINTY...
THE LEVEL OF CERTAINTY FOR DAYS 1 AND 2 IS HIGH.
THE LEVEL OF CERTAINTY FOR DAYS 3 THROUGH 7 IS HIGH.
THIS INFORMATION IS PROVIDED AS PART OF A TRIAL PROJECT CONDUCTED
BY THE NATIONAL WEATHER SERVICE SAN JOAQUIN VALLEY - HANFORD.
CERTAINTY LEVELS INCLUDE LOW...MEDIUM...AND HIGH. PLEASE VISIT
WWW.WEATHER.GOV/HNX/CERTAINTY.PHP /ALL LOWER CASE/ FOR ADDITIONAL
INFORMATION AND/OR TO PROVIDE FEEDBACK.
&&
.CLIMATE...
RECORDS
SITE DATE HI_MAX:YEAR LO_MAX:YEAR HI_MIN:YEAR LO_MIN:YEAR
KFAT 03-12 84:1910 50:1952 55:2005 28:1950
KFAT 03-13 84:2007 53:1981 59:1932 31:1950
KFAT 03-14 83:2007 48:1975 55:1995 29:1944
KBFL 03-12 88:1910 51:2006 56:1979 25:1907
KBFL 03-13 88:2007 53:1969 59:1979 21:1907
KBFL 03-14 88:1916 53:1944 62:1900 28:1907
&&
.HNX WATCHES/WARNINGS/ADVISORIES...
NONE.
&&
$$
PUBLIC...INIGUEZ
AVN/FW...INIGUEZ
PREV DISCUSSION...INIGUEZ
SYNOPSIS...INIGUEZ
WEATHER.GOV/HANFORD
AREA FORECAST DISCUSSION
NWS GRAND JUNCTION CO
1104 PM MDT TUE MAR 11 2014
.UPDATE...
ISSUED AT 1055 PM MDT TUE MAR 11 2014
THE NEW COLDER AIR MASS CONTINUES TO BE REINFORCED FROM THE NE
TONIGHT. SKIES HAVE CLEARED ACROSS THE FORECAST AREA EXCEPT IN THE
NW SAN JUAN MTNS. THE 03Z RAP SHOWS ENHANCED VORTICITY IN THE
DEFORMATION AXIS THAT IS STRETCHED ACROSS SOUTHERN UTAH AND SW
COLORADO. LIGHT SNOW AND OBSCURED MTNS LIKELY TO CONTINUE UNTIL
3AM OR SO THEN CLEAR THERE TOO.
THE WESTERN PORTION OF THE SHEARED TROUGH CLOSES JUST TO THE NW OF
LAS VEGAS ON WEDNESDAY. A WEAK DEFORMATION ZONE REMAINS STRETCHED
ACROSS THE CENTRAL FORECAST AREA THAT MAY PRODUCE SOME CLOUDS BUT
NO SNOW. AFTER A COLD MORNING AFTERNOON TEMPERATURES WILL BE JUST
A FEW DEGREES BELOW NORMAL.
&&
.SHORT TERM...(TONIGHT THROUGH WEDNESDAY NIGHT)
ISSUED AT 319 PM MDT TUE MAR 11 2014
SHEARING E-W ORIENTED TROF IS DROPPING ACROSS NORTHERN COLORADO
AND UTAH THIS AFTERNOON. WATER VAPOR IS SHOWING TWO CIRCULATIONS
BECOMING MORE DEFINED IN WATER VAPOR THIS AFTERNOON...ONE
RETROGRADING TOWARD SALT LAKE CITY AND ANOTHER DROPPING ACROSS THE
CHEYENNE RIDGE OF THE FRONT RANGE. DECENT COLD POOL ARCING
SOUTHWARD BETWEEN THESE TWO FEATURES WITH THE DELTA T OR
INSTABILITY AXIS LINING UP WELL WITH MOST ROBUST CONVECTION THIS
AFTERNOON. DRY AIR IN THE LOW LAYERS AND THE CONVECTIVE NATURE IS
HELPING SNOW MAKE IT TO THE GROUND WITH SURFACE TEMPERATURES WELL
INTO THE 40S. LOOKING AT SNOW STAKES AND SNOTELS A GOOD 6 TO 10
INCHES LOOKS TO HAVE FALLEN ACROSS THE ADVISORY AREA WITH LOCALLY
HIGHER AMOUNTS AIDED BY THE INSTABILITY.
STILL EXPECT A RATHER QUICK DOWNTURN TO THE PRECIPITATION THIS
EVENING WITH THE LOSS OF SURFACE HEATING. THE TWO CIRCULATIONS
WILL CONTINUE TO DIVERGE WITH THE WESTERN CIRCULATION LIKELY FORMING A
CLOSED LOW IN THE MID LEVELS BY WEDNESDAY AFTERNOON OVER SOUTHERN
NEVADA. THIS WILL BECOME A REX LOW AS THE UPPER RIDGE BUILDS
ACROSS THE NORTHERN ROCKIES AND KEEPS THINGS MORE QUIET FOR
WEDNESDAY. MOSTLY SUNNY SKIES SHOULD BE IN PLACE WITH JUST A FEW
HIGH BASED CLOUDS AND SHOWERS POPPING OVER THE HIGH PEAKS OF THE
SAN JUANS WHERE THE INSTABILITY WILL BE THE HIGHEST. WITH CLEARING
SKIES TONIGHT TEMPERATURES WILL BE QUITE A BIT COOLER THAN LAST
NIGHT WITH LOWS DROPPING BACK INTO THE SINGLE DIGITS OVER THE
HIGHER VALLEYS AND BASINS. TOMORROW/S HIGHS SHOULD BE A TAD WARMER
BUT THEY STILL LOOK LIKE THEY/LL END UP ON THE COLD SIDE OF NORMAL.
THE UPPER LOW WILL BEGIN TO GET A KICK EASTWARD WEDNESDAY NIGHT AS
STRONGER ENERGY WORKS IT/S WAY THROUGH THE RIDGE. MOISTURE
TRANSPORT VECTORS AROUND 300K SHOW THIS LOW PULLING IN THE PACIFIC
MOISTURE TAP OFF THE BAJA COAST WHICH IT LOOKS TO USE FOR
INCREASED PRECIPITATION CHANCES GOING INTO THURSDAY.
.LONG TERM...(THURSDAY THROUGH TUESDAY)
ISSUED AT 319 PM MDT TUE MAR 11 2014
THE UPPER LEVEL LOW AFOREMENTIONED BEGINS TO PROPAGATE EASTWARD
ON THURSDAY WITH THE HELP OF AN UPPER LEVEL TROUGH COMING ONSHORE
OVER THE PACIFIC NW AND MOVING EAST OVER THE NORTHERN ROCKIES.
THOUGH THE CENTER OF ENERGY FROM THIS UPPER LEVEL LOW WILL MAINLY
STAY TO THE SOUTH OF THE GRAND JUNCTION CWA...WE ARE EXPECTING A
FEW AFTERNOON AND EARLY EVENING THUNDERSTORMS DUE TO INSTABILITY
AND WRAP-AROUND MOISTURE ON THURSDAY IN THE FOUR CORNERS REGION.
THE BEST FORCING ON THURSDAY IS FORECAST TO STAY JUST SOUTH OF THE
FOUR CORNERS BUT CONVECTIVE SHOWERS AND THUNDERSTORMS ARE EXPECTED
AS FAR NORTH AS THE UNCOMPAHGRE AND POTENTIALLY INTO THE CENTRAL
MTNS. ONCE THIS DISTURBANCE PASSES...THE REGION REMAINS IN
NORTHWEST FLOW WITH A JET MAX OVERHEAD WHICH MEANS THE RECENT
PATTERN OF ACTIVE WEATHER EVERY FEW DAYS IS LIKELY TO CONTINUE
THROUGH AT LEAST THE WEEKEND. BOTH THE GFS AND EC BRING THE NEXT
WEATHER DISTURBANCE INTO WESTERN COLORADO ON SATURDAY WHICH HAS
THE POTENTIAL TO CAUSE MAJOR IMPACTS ALONG COLORADO HIGHWAYS
SATURDAY MORNING THROUGH SATURDAY NIGHT. AT THIS TIME...THIS
DISTURBANCE IS FAIRLY PROGRESSIVE SO SHOULD SWING THROUGH WESTERN
COLORADO QUICKLY AND NOT CAUSE PROBLEMS INTO SUNDAY MORNING. THIS
TIMING COULD CHANGE BUT CONFIDENCE IS MODERATE AS MODELS THIS FAR
OUT AGREE ON A SIMILAR SOLUTION.
FROM SUNDAY ON IS WHEN MODEL CONFIDENCE DECREASES. THE LATEST 12Z
EC HAS DRASTICALLY CHANGED FROM THE PREVIOUS 00Z RUN TO LINE UP
MORE CLOSELY WITH THE 00Z AND 12Z GFS RUNS WHICH BUILD HIGH
PRESSURE OVER THE GREAT BASIN. THE EC DOES KEEP NORTH CENTRAL
COLORADO IN NORTHWEST FLOW AND SUGGESTS A DISTURBANCE COMES
THROUGH MID WEEK BUT THIS DISTURBANCE LOOKS VERY WEAK AT THIS
TIME.
TEMPERATURES WILL REMAIN NEAR NORMAL OR SLIGHTLY ABOVE NORMAL THROUGHOUT
NEXT WEEK.
&&
.AVIATION...(FOR THE 06Z TAFS THROUGH 06Z WEDNESDAY EVENING)
ISSUED AT 1055 PM MDT TUE MAR 11 2014
VFR CONDITIONS WILL DOMINATE THROUGH WEDNESDAY NIGHT WITH ONE
EXCEPTION. IN THE NW SAN JUAN MTNS UNTIL 10Z TONIGHT....FROM KTEX
EAST TO SLUMGULLION PASS...MVFR TO LOCAL IFR CIGS IN -SHSN WITH
MTN TOPS FREQUENTLY OBSCURED.
&&
.GJT WATCHES/WARNINGS/ADVISORIES...
CO...NONE.
UT...NONE.
&&
$$
UPDATE...JOE
SHORT TERM...15
LONG TERM...JAM
AVIATION...TGR
AREA FORECAST DISCUSSION
NWS TAUNTON MA
657 PM EDT WED MAR 12 2014
.SYNOPSIS...
AN INTENSIFYING LOW PRESSURE WILL CROSS SOUTHERN NEW ENGLAND LATER
THIS EVENING AND OVERNIGHT. RAIN WILL TRANSITION TO SNOW AS THIS
LOW PRESSURE MOVES BY. TEMPERATURES PLUMMET TONIGHT...ALLOWING FOR
A FLASH FREEZE. BITTERLY COLD AIR AND STRONG WINDS EXPECTED
THURSDAY WITH LINGERING SNOW SHOWERS TAPER OFF DURING THE
AFTERNOON. MILDER WEATHER RETURNS FRI AND SAT...BEFORE COLDER AIR
RETURNS SUNDAY INTO EARLY NEXT WEEK.
&&
.NEAR TERM /UNTIL 6 AM THURSDAY MORNING/...
7 PM UPDATE...RAIN HAS BECOME WIDESPREAD ACROSS SOUTHERN NEW
ENGLAND THIS EVENING. TWO LOCATIONS TO NOTE...ONE IS A BAND OF
HEAVIER RAIN STRETCHED FROM MANCHESTER NEW HAMPSHIRE SOUTHWESTWARD
TO HARTFORD CONNECTICUT. SEEING RAINFALL RATES OF A TENTH OF AN
INCH PER HOUR WITHIN THIS BAND OF HEAVY RAIN. THE OTHER AREA OF
NOTE IS A CLUSTER FOR STRONGER ECHOES EAST OF CAPE COD. AS THIS
AREA MOVED OVER NANTUCKET...LIGHTNING AND THUNDER OCCURRED AND A
QUICK BURST OF HEAVY RAINFALL. EXPECT THE STRONGER ECHOES EAST OF
CAPE COD AND SOUTH OF NANTUCKET TO REMAIN OFFSHORE BUT FOLKS ON
NANTUCKET MAY HEAR A FEW RUMBLES OF THUNDER AS THEY PASS THE
ISLAND.
CAN SEE THE FRONTS PROGRESSION IN THE TEMPERATURES WITH 30S NORTH
AND WEST OF A BEVERLY TO WORCESTER TO HARTFORD LINE AND UPPER 40S
TO EVEN MID 50S STILL SOUTH AND EAST OF THAT LINE.
MADE SOME MINOR MODIFICATIONS TO THE POPS THROUGH EARLY TOMORROW
MORNING BASED ON THE LATEST TRENDS AND THE RAP POPS.
OTHERWISE...THE FORECAST REMAINS ON TRACK.
PREVIOUS DISCUSSION...
FOR TONIGHT...EXPECTING RAINFALL TO TRANSITION TO SNOW...WITH A
PERIOD OF FREEZING RAIN AND SLEET IN THE MIDDLE. WILL CONTINUE THE
WINTER WEATHER ADVISORIES WHERE ALREADY ISSUED. THE MOST
SIGNIFICANT CONCERN WILL BE TEMPERATURES FALLING WELL BELOW
OVERNIGHT. THIS WILL LEAD TO A FREEZING OF UNTREATED SURFACES.
HIGH TEMPERATURE FOR THE DAY THURSDAY SHOULD BE NEAR OR SHORTLY
AFTER MIDNIGHT.
SNOW ACCUMULATIONS STILL EXPECTED TO REMAIN BELOW WARNING LEVEL.
&&
.SHORT TERM /6 AM THURSDAY MORNING THROUGH 6 PM THURSDAY/...
THURSDAY...
BITTERLY COLD WITH NORTHWEST WIND GUSTS OF 40 TO 50 MPH EXPECTED
TO BE THE CHARACTER OF THE DAY. DESPITE A SURFACE LOW PRESSURE
BEING TO OUR EAST...OUR REGION WILL STILL HAVE TO CONTEND WITH A
MID LEVEL TROUGH AND SHORTWAVE. STILL THINKING THERE WILL BE
SCATTERED TO NUMEROUS SNOW SHOWERS DURING THE MORNING...INCLUDING
THE THURSDAY MORNING COMMUTE...MAINLY ACROSS RI AND EASTERN MA.
SNOW SHOWERS TAPER OFF FROM WEST TO EAST THROUGH THE DAY.
STILL EVALUATING THE NEED FOR WIND ADVISORIES. IT STILL APPEARS
RATHER MARGINAL...SO DECIDED TO HOLD OFF AND LET THE NEXT SHIFT
TAKE A CLOSER LOOK. STRONG COLD AIR ADVECTION WILL RESULT IN
RATHER DEEP MIXING...PARTICULARLY ACROSS THE COASTAL WATERS.
TEMPERATURES WILL REMAIN IN THE UPPER TEENS AND LOWER 20S ALL
DAY...WHICH IS VERY IMPRESSIVE COLD FOR THIS TIME OF YEAR. WIND
CHILL VALUES WILL BE BELOW ZERO.
DRY AND COLD CONDITIONS EXPECTED THURSDAY NIGHT. WITH AMBIENT
MIN TEMPERATURES IN THE SINGLE DIGITS AND LOW TEENS...COMBINED
WITH GUSTY NORTHWEST WINDS...WIND CHILL VALUES MAY APPROACH
WIND CHILL ADVISORY LEVELS. STILL TIME TO EVALUATE THAT RISK.
&&
.LONG TERM /THURSDAY NIGHT THROUGH WEDNESDAY/...
12/12Z MODELS ARE IN GOOD AGREEMENT THROUGH THE LONG TERM. THERE
ARE SOME DISCREPANCIES OUT TOWARDS THE END OF THE PERIOD BUT OVERALL
THE SYNOPTIC PATTERN BOTH ALOFT AND AT THE SURFACE IS IN GOOD
AGREEMENT. THERE ARE BASICALLY TWO POTENTIAL PERIODS OF
PRECIPITATION IN THE LONG TERM. ONE LATE FRIDAY NIGHT INTO SATURDAY
MORNING AND THE OTHER IS TUESDAY NIGHT INTO WEDNESDAY NEXT WEEK.
BOTH ASSOCIATED WITH LOW PRESSURE MOVING THROUGH QUEBEC PULLING A
COLD FRONT THROUGH SOUTHERN NEW ENGLAND. ASIDE FROM THESE TWO
PERIODS OF PRECIPITATION...LOOKING AT DRY WEATHER WITH BELOW NORMAL
TEMPERATURES.
FRIDAY...LOW PRESSURE MOVES THROUGH THE GREAT LAKES INTO SOUTHERN
QUEBEC. WEATHER SHOULD BE QUIET FOR MUCH OF THE DAY THOUGH EXPECT
INCREASING CLOUDS FRIDAY NIGHT AHEAD OF A COLD FRONT.
SATURDAY AND SUNDAY...COULD SEE A PERIOD OF MIXED PRECIPITATION
AHEAD OF THE COLD FRONT BEGINNING EARLY SATURDAY MORNING...MAINLY
ACROSS THE NORTHWEST INTERIOR PORTION OF THE AREA. THIS WILL BE
SHORT LIVED AND COME TO AN END AS THE FRONT SWEEPS ACROSS SOUTHERN
NEW ENGLAND BY MIDDAY SATURDAY. HIGH TEMPERATURES WILL ACTUALLY BE
SLIGHTLY ABOVE NORMAL...REACHING INTO THE UPPER 40S TO AROUND 50.
DESPITE THE PRECIPITATION...SATURDAY WILL BE THE PICK OF THE WEEKEND
IN TERMS OF TEMPERATURES AS COLDER AIR MOVES IN SATURDAY NIGHT.
HIGHS SUNDAY ARE EXPECTED TO BE IN THE 30S TO MID 40S AS HIGH
PRESSURE BUILDS INTO SOUTHERN NEW ENGLAND.
MONDAY...TEMPERATURES JUST BELOW NORMAL WILL CONTINUE AS HIGH
PRESSURE CRESTS OVER THE REGION.
TUESDAY AND WEDNESDAY...ANOTHER LOW PRESSURE CENTER WILL MOVE
THROUGH THE GREAT LAKES INTO SOUTHERN QUEBEC BRINGING ANOTHER CHANCE
OF PRECIPITATION /CURRENTLY LOOKING LIKE SNOW TUESDAY NIGHT
TRANSITIONING TO RAIN WEDNESDAY/ TO THE REGION. PRECIPITATION WILL
COME TO AN END LATE WEDNESDAY AS THE COLD FRONT MOVES THROUGH
SOUTHERN NEW ENGLAND. TEMPERATURES REMAIN BELOW NORMAL FOR MID
MARCH.
&&
.AVIATION /00Z THURSDAY THROUGH MONDAY/...
LOW...LESS THAN 30 PERCENT.
MODERATE...30 TO 60 PERCENT.
HIGH...GREATER THAN 60 PERCENT.
SHORT TERM...THROUGH THURSDAY NIGHT.
HIGH CONFIDENCE IN TRENDS...LOWER CONFIDENCE IN EXACT TIMING.
TONIGHT...MAINLY IFR WITH SOME MVFR CONDITIONS. RAIN TRANSITIONS
TO SNOW FROM NORTHWEST TO SOUTHEAST AS THE NIGHT WEARS ON. A BRIEF
PERIOD OF SLEET/FREEZING RAIN IS POSSIBLE DURING THE TRANSITION
ESPECIALLY NORTH OF THE MA TURNPIKE. NORTHERLY WINDS WILL GUST
BETWEEN 20 AND 30 KNOTS BEHIND THE STORM BY LATE EVENING INTO THE
OVERNIGHT HOURS. SOME LLWS POSSIBLE AS WINDS SHIFT TO THE NW
RAPIDLY.
THURSDAY...MVFR TO IFR CONDITIONS IN SNOW SHOWERS IN THE MORNING
SHOULD IMPROVE SOME DURING THE AFTERNOON FROM WEST TO EAST.
EXPECTING CONDITIONS TO IMPROVE TO MVFR...IF NOT VFR...BY MID TO
LATE AFTERNOON. NORTHWEST WIND GUSTS OF 30 TO 45 KNOTS EXPECTED.
THURSDAY NIGHT...HIGH CONFIDENCE VFR.
PRELIMINARY SNOWFALL FORECAST...
BOS...1 TO 2 INCHES TONIGHT/THU AM
PVD...1/2 TO 2 INCHES TONIGHT/THU AM
BDL...1/2 TO 2 INCHES TONIGHT/THU AM
ORH...1-3 INCHES LATE TONIGHT/THU AM
MHT...2-5 INCHES LATE TONIGHT/THU AM
KBOS TERMINAL...HIGH CONFIDENCE IN TRENDS...MODERATE CONFIDENCE IN
TIMING.
KBDL TERMINAL...HIGH CONFIDENCE IN TRENDS...MODERATE CONFIDENCE IN
TIMING.
OUTLOOK...FRIDAY THROUGH MONDAY.
FRIDAY...HIGH CONFIDENCE. VFR.
FRIDAY NIGHT INTO SATURDAY MORNING...MODERATE CONFIDENCE.
CONDITIONS DETERIORATE TO MVFR/IFR IN A WINTRY MIX OF PRECIP ACROSS
THE NW INTERIOR.
SATURDAY AFTERNOON THROUGH MONDAY...HIGH CONFIDENCE. VFR.
&&
.MARINE...
FORECASTER CONFIDENCE LEVELS...
LOW...LESS THAN 30 PERCENT.
MODERATE...30 TO 60 PERCENT.
HIGH...GREATER THAN 60 PERCENT.
SHORT TERM /TONIGHT THROUGH THURSDAY/...HIGH CONFIDENCE.
MIXED WIND ACROSS THE WATERS THIS AFTERNOON AND EVENING WITH A
BOUNDARY EXTENDING EAST FROM NEAR MARSHFIELD MA ACROSS THE
SOUTHERN EXTENT OF STELLWAGEN BANK. EAST TO NORTH WINDS NORTH OF
THIS BOUNDARY...WITH STRONG SOUTH WINDS SOUTH OF THIS BOUNDARY.
GALE FORCE WIND GUSTS ARE EXPECTED AS A DEVELOPING LOW PRESSURE
MOVES EAST ALONG THIS BOUNDARY OVERNIGHT. LOWER VSBYS IN RAIN AND
SNOW EXPECTED. MODERATE FREEZING SPRAY WILL DEVELOP DURING
THURSDAY AFTERNOON INTO THURSDAY NIGHT AS AN USUALLY COLD AIR MASS
FOR MID MARCH ADVANCES OVER THE WATERS. LATER SHIFTS WILL LIKELY
NEED TO ISSUE A FREEZING SPRAY ADVISORY. IN ADDITION...SEAS ACROSS
THE EASTERN ATLANTIC WATERS WILL BUILD TO BETWEEN 7 AND 13 FEET
FOR THURSDAY. WINDS AND SEAS DIMINISH THURSDAY NIGHT.
OUTLOOK...FRIDAY THROUGH MONDAY...
FRIDAY THROUGH SATURDAY...HIGH CONFIDENCE. SMALL CRAFT ADVISORIES
LIKELY NEEDED WITH SOUTHWESTERLY WINDS GUSTING TO 30 KTS AHEAD OF A
COLD FRONT MOVING OVER THE WATERS. SEAS INCREASE TO 5 TO 7 FEET ON
THE OUTER WATERS.
SATURDAY NIGHT...HIGH CONFIDENCE. WINDS SHIFT TO THE NORTHWEST AND
WINDS AND SEAS GRADUALLY DIMINISH BEHIND THE COLD FRONT.
SUNDAY...MODERATE CONFIDENCE. WINDS AND SEAS SHOULD REMAIN BELOW
SMALL CRAFT CRITERIA FOR MOST OF THE PERIOD AS HIGH PRESSURE BUILDS
OVER THE WATERS.
MONDAY...MODERATE CONFIDENCE. WINDS AND SEAS INCREASE TO JUST OVER
SMALL CRAFT CRITERIA ON THE OUTER WATERS.
&&
.CLIMATE...
NEAR RECORD COLD POSSIBLE THU NIGHT INTO EARLY FRIDAY. HERE ARE
RECORD LOW TEMPERATURES FOR FRIDAY MARCH 14TH...
BOSTON.......12/1896...FORECAST LOW...14
PROVIDENCE...12/1948...FORECAST LOW...13
BRADLEY ARPT..7/1948...FORECAST LOW...9
WORCESTER.....4/1948...FORECAST LOW...8
&&
.BOX WATCHES/WARNINGS/ADVISORIES...
CT...WINTER WEATHER ADVISORY FROM 10 PM THIS EVENING TO NOON EDT
THURSDAY FOR CTZ002>004.
MA...WINTER WEATHER ADVISORY UNTIL NOON EDT THURSDAY FOR MAZ002-003.
WINTER WEATHER ADVISORY FROM 10 PM THIS EVENING TO NOON EDT
THURSDAY FOR MAZ004>019-026.
NH...WINTER WEATHER ADVISORY UNTIL NOON EDT THURSDAY FOR NHZ011-012-
015.
RI...WINTER WEATHER ADVISORY FROM 10 PM THIS EVENING TO NOON EDT
THURSDAY FOR RIZ001>005.
MARINE...GALE WARNING FROM 8 AM TO 8 PM EDT THURSDAY FOR ANZ232>235-237-
254>256.
GALE WARNING FROM 5 AM TO 8 PM EDT THURSDAY FOR ANZ230-236.
GALE WARNING FROM 2 AM TO 8 PM EDT THURSDAY FOR ANZ231-250-251.
&&
$$
SYNOPSIS...BELK/RLG
NEAR TERM...BELK/RLG
SHORT TERM...BELK
LONG TERM...RLG
AVIATION...BELK/RLG
MARINE...BELK/RLG
CLIMATE...
AREA FORECAST DISCUSSION
NWS TAUNTON MA
1047 AM EDT WED MAR 12 2014
.SYNOPSIS...
AN INTENSIFYING LOW PRESSURE SYSTEM APPROACHING FROM THE WEST WILL
RESULT IN STEADY RAIN DEVELOPING THIS AFTERNOON. RAIN WILL
TRANSITION TO FREEZING RAIN/SLEET THEN SNOW LATER TONIGHT AS
TEMPERATURES CRASH ALLOWING FOR A FLASH FREEZE. BITTERLY COLD AIR
AND STRONG WINDS ARE EXPECTED ON THURSDAY AS LINGERING SNOW SHOWERS
TAPER OFF DURING THE AFTERNOON. MILDER WEATHER RETURNS FRI AND
SAT...BEFORE ANOTHER INSTALLMENT OF COLDER AIR ARRIVES SUNDAY INTO
EARLY NEXT WEEK.
&&
.NEAR TERM /UNTIL 6 PM THIS EVENING/...
***STEADY RAIN WILL NOT AFFECT MOST LOCATIONS UNTIL THIS AFTERNOON
AND POSSIBLY NOT REACHING THE COASTAL PLAIN UNTIL EARLY EVENING***
1045 AM UPDATE...
12/12Z OBSERVED SOUNDINGS INDICATE A PRONOUNCED WARM NOSE ALREADY
IN PLACE ACROSS SOUTHERN NEW ENGLAND. REGIONAL RADARS SHOWING
PRECIPITATION ON OUR DOORSTEP...BUT DRYING UP SOMEWHAT AS IT
MOVES EAST. 12/14Z OBSERVATIONS STILL HAD RATHER LARGE DEW POINT
DEPRESSIONS...PARTICULARLY TOWARD SOUTHEAST MA AND RI. EXPECTING
THESE CONDITIONS TO CHANGE AS THE AFTERNOON PROGRESSES. DID ADJUST
THE ARRIVAL TIME OF RAINFALL LATER THIS AFTERNOON...LEANING
HEAVILY UPON THE 12/12Z NAM AND 12/13Z RAP GUIDANCE.
OTHERWISE...MADE SOME MINOR TWEAKS TO NEAR TERM CONDITIONS TO KEEP
THEM IN LINE WITH OBSERVED TRENDS. NO CHANGES TO EXISTING
HEADLINES AT THIS TIME.
PREVIOUS DISCUSSION FOLLOWS...
LOW PRESSURE ACROSS THE OHIO VALLEY WILL MOVE EAST NORTHEAST TODAY
AS IT INTENSIFIES. THE BULK OF THE FORCING/LIFT WILL BE WELL TO OUR
NORTHWEST THIS MORNING. THEREFORE...OTHER THAN SCATTERED SHOWERS
ACROSS THE INTERIOR THIS MORNING..MAINLY DRY WEATHER WILL PREVAIL.
PTYPE SHOULD BE LIQUID ACROSS MOST OF THE REGION THIS MORNING...BUT
A FEW WET SNOW FLAKES ARE POSSIBLE ACROSS THE HIGHER TERRAIN OF
SOUTHWEST NH BUT NO ACCUMULATIONS ARE EXPECTED.
STEADY RAIN WILL MOVE INTO AREAS NORTHWEST OF I-95 DURING THE MID TO
LATE AFTERNOON. IT MAY TAKE UNTIL EARLY EVENING FOR THE STEADY RAIN
TO REACH THE COASTAL PLAIN. GIVEN THE TRACK OF THE STORM...BULK OF
THE MID LEVEL FORCING/FRONTOGENESIS WILL BE ACROSS THE INTERIOR THIS
AFTERNOON.
AS FOR PTYPE...MODELS SOUNDINGS INDICATE IT WILL BE WARM ENOUGH FOR
RAIN FOR MUCH OF THE AFTERNOON FOR SOUTHERN NEW ENGLAND.
HOWEVER...WILL HAVE TO WATCH FOR SOME POCKETS OF SLEET/FREEZING RAIN
DEVELOPING BY LATE AFTERNOON IN SOUTHWEST NH/NORTHWEST MA AS SHALLOW
COLD AIR BEGINS TO WORK INTO THE AREA.
ACROSS THE REST OF THE REGION HIGH TEMPS WILL MAINLY BE IN THE 40S
BUT SOME LOWER TO MIDDLE 50S ARE POSSIBLE IN THE WARM SECTION OF
INTERIOR RHODE ISLAND/SOUTHEAST MA.
&&
.SHORT TERM /6 PM THIS EVENING THROUGH 6 PM THURSDAY/...
***RAIN CHANGES TO BRIEF PERIOD OF SLEET/FREEZING RAIN AND THEN TO
SNOW FROM NORTHWEST TO SOUTHEAST TONIGHT***
***FLASH FREEZE OVERNIGHT WITH IMPACT ON THURSDAY AM RUSH HOUR A
MUCH BIGGER CONCERN THAN SNOW ACCUMULATIONS***
INTENSE LOW PRESSURE WILL TRACK ACROSS RHODE ISLAND AND SOUTHEAST MA
TONIGHT. ONCE THE LOW PASSES TO THE EAST...TEMPERATURES WILL CRASH
AN RAIN WILL CHANGE TO SNOW. THE COLD AIR INITIALLY COMES DOWN
SHALLOW...SO A BRIEF PERIOD OF SLEET/FREEZING RAIN IS POSSIBLE
ESPECIALLY NORTH OF THE MA TURNPIKE. THE RAIN SHOULD CHANGE TO
SLEET/FREEZING THEN SNOW ACROSS SOUTHWEST NH/WESTERN MA BY LATE
EVENING...THEN BETWEEN 11 PM AND 3 AM ON THE COASTAL PLAIN.
THE MID LEVEL CENTERS OF THE STORM TRACK TO THE WEST OF OUR REGION.
THAT MEANS THAT THE VERY HEAVY SNOW AMOUNTS WILL CONFINED TO
NORTHERN NEW ENGLAND. THE ONE THING WILL HAVE TO WATCH IS NORTHERN
CHESHIRE/NORTHWEST HILLSBOROUGH COUNTIES WHERE SOME 6+ INCH SNOW
AMOUNTS ARE POSSIBLE. WE WERE NOT CONFIDENT ENOUGH THAT THESE
AMOUNTS WOULD COVER A LARGE ENOUGH PORTION OF THE COUNTIES FOR AN
UPGRADE TO A WARNING...BUT SOMETHING LATER SHIFTS MAY HAVE TO
CONSIDER. BEST CHANCE FOR THAT WILL BE ACROSS CHESHIRE COUNTY.
ACROSS MOST OTHER AREAS...HAVE HOISTED A WINTER WEATHER ADVISORY
EXCEPT FOR THE SOUTH COAST/CAPE AND ISLANDS. FOR MOST LOCATIONS
WERE JUST EXPECTING 1 TO 2 INCHES OF SNOW...WITH PERHAPS 2 TO 4
INCHES NORTH OF ROUTE 2. HOWEVER...GIVEN THE POTENTIAL FOR A BRIEF
PERIOD OF SLEET/FREEZING RAIN AND FLASH FREEZE WITH TEMPS EXPECTED
TO CRASH INTO THE TEENS AND LOWER 20S...FELT AN ADVISORY WAS WORTH
IT. ESPECIALLY WITH AN IMPACT EXPECTED ON THE THURSDAY AM RUSH HOUR.
VERY IMPRESSIVE TEMPERATURE FALL AS SOME LOCATIONS IN RHODE
ISLAND/SOUTHEAST MA MAY BE NEAR 50 THIS EVENING AND INTO THE UPPER
TEENS LOWER 20S BY EARLY THU AM!
THURSDAY...
***BITTERLY COLD WITH NORTHWEST WIND GUSTS OF 40 TO 50 MPH***
POTENT UPPER TROUGH WILL BE LAGGING BEHIND SURFACE LOW PRESSURE.
THEREFORE...EXPECT SNOW SHOWERS TO CONTINUE THROUGHOUT THE MORNING
BEFORE TAPERING OFF DURING THE AFTERNOON. TEMPERATURES WILL REMAIN
IN THE UPPER TEENS AND LOWER 20S ALL DAY...WHICH IS VERY IMPRESSIVE
COLD FOR THIS TIME OF YEAR. WIND CHILLS WILL BE BELOW ZERO. IN
ADDITION...NORTHWEST WIND GUSTS OF 40 TO 50 MPH IN STRONG COLD
ADVECTION WILL LIKELY REQUIRE THE NEED FOR A WIND ADVISORY. SINCE
ITS A 3RD PERIOD EVENT AND THERE IS A LOT GOING ON WILL LET THE NEXT
SHIFT HANDLE.
&&
.LONG TERM /THURSDAY NIGHT THROUGH TUESDAY/...
*** TYPICAL MARCH WEATHER WITH A MIX OF SPRING AND WINTER-LIKE
TEMPS THIS PERIOD ***
OVERVIEW AND MODEL PREFERENCES...
12.00Z MODEL GUIDANCE SUITE IS IN FAIRLY GOOD SYNOPTIC SCALE
AGREEMENT THROUGH THE WEEKEND AT LEAST BUT THEN BEGINS TO SHOW
TYPICAL SPREAD/BIASES BY EARLY TO MID NEXT WEEK.
THE KEY TO THE EXTENDED PERIOD WILL BE AN ARCTIC CUTOFF...THAT IS
A PIECE OF THE POLAR VORTEX WHICH WILL GRADUALLY SETTLE ACROSS
NORTHERN QUEBEC. THIS WILL BE EMBEDDED WITHIN A GENERAL POSITIVE
NAO/AO REGIME...SUGGESTING A PROGRESSIVE STORM TRACK FROM THE ERN
CONUS INTO THE NRN ATLANTIC. THEREFORE...THE KEY TO THE ULTIMATE
STORM TRACK FOR EARLY NEXT WEEK WILL BE EXACTLY WHERE THE VORTEX
AND ITS LONGWAVE TROF EXTENSION INTO THE ERN CONUS SETS UP. LATEST
ECMWF AS WELL AS SOME OF THE GEFS/ECENS MEMBERS SUGGEST A SLIGHTLY
LESS PROGRESSIVE TRACK...ALLOWING THE TROF TO SET UP MAINLY FROM
THE GREAT LAKES INTO THE GULF OF MEXICO...PICKING UP ENERGY AND
MOISTURE AS IT DOES. IT IS THIS SOLUTION THAT WOULD BRING THE BEST
SHOT AT ANOTHER COASTAL STORM FOR EARLY NEXT WEEK. THE GFS
SOLUTION IS MORE PROGRESSIVE AND SUPPRESSED TO THE S. ONCE AGAIN
THOUGH...ASIDE FROM THE LONGWAVE TROF IT WILL REQUIRE ADDITIONAL
SHORTWAVE ENERGY...BOTH FROM ARCTIC THE NRN PACIFIC. EACH OF THESE
WAVES WILL NOT BE IN AN OBSERVATION RICH AREA FOR ABOUT 48+
HOURS...SO EXPECT THE TRACK TO SETTLE BETTER BY THE WEEKEND. FOR
NOW...WILL BLEND OPERATIONAL GUIDANCE TO TAKE INTO ACCOUNT ALL
POSSIBILITIES.
DETAILS...
THU NIGHT INTO FRI NIGHT...
MAINLY DRY WX THROUGH THE PERIOD AS A RIDGE OF HIGH PRES NOSES
OVER THE REGION FROM THE S. THU NIGHT IS EXPECTED TO START
COLD...WITH AMBIENT MINS DROPPING INTO THE SINGLE DIGITS AND LOW
TEENS. THIS WILL BE COMBINED WITH GUSTY NW WINDS AND MAY YIELD
WIND CHILLS APPROACHING -10F TO -15F...SO NOT OUT OF THE QUESTION
WIND CHILL ADVISORIES MAY BE NEEDED. OTHERWISE...TEMPERATURES
REBOUND BY FRI...SHIFTING INTO THE LOW TO UPPER 30S AND ONLY
DROPPING BACK INTO THE MID 20S TO LOW 30S THANKS TO INCREASING
CLOUDS FRI NIGHT.
SAT INTO SUN NIGHT...
MODERATING TEMPERATURES EXPECTED UNDER WEAK WARM ADVECTION AHEAD
OF A COLD FRONT SAT. THIS SHOULD ALLOW HIGHS TO REACH INTO THE MID
40S TO LOW 50S. THE COLD FRONT IS EXPECTED TO SLIDE THROUGH BY
AFTERNOON...LIFT WITH IT IS WEAK...MAINLY FROM THE ISENTROPIC
SUPPORT WITHIN THE WARM ADVECTION AHEAD OF IT. MOISTURE IS ALSO
LACKING...WITH ONLY ABOUT A QUARTER TO HALF INCH PWAT VALUES.
SO...A FEW SHOWERS MAY ACCOMPANY THIS FRONT AS IT PASSES...BUT
CERTAINLY NOT A WASHOUT AND SOME AREAS MAY STAY DRY ALTOGETHER.
COLD AND DRIER AIR SETTLES IN BEHIND THE FRONT SAT NIGHT INTO SUN
NIGHT. LOWS IN THE LOW TO UPPER 20S EXPECTED SAT NIGHT UNDER
CLOUD COVER AND HIGHS SUN ONLY IN THE 30S. ANOTHER ROUND OF COLD
MINS SUN NIGHT...SETTLING IN THE TEENS AND LOW 20S.
MON INTO TUE...
THE COLD FRONT SETTLES OFFSHORE SUN...ORIENTING ALONG THE MEAN
STORM TRACK...WHICH REMAINS A BIT IN QUESTION BASED ON THE
OVERVIEW DISCUSSION ABOVE. THERE ARE INGREDIENTS FOR ANOTHER
COASTAL WAVE OF LOW PRES TO DEVELOP...BUT ITS POTENCY AND TRACK
ARE UNCERTAIN. AS MENTIONED ABOVE...CURRENT ECMWF /AS WELL AS
GEFS/ECENS MEMBERS AND EVEN THE GLOBAL CMC/ SUGGEST IT MAY MAKE A
CLOSE ENOUGH PASS FOR SOME WRAP-AROUND SNOWS ACROSS SRN NEW
ENGLAND...BUT THE MORE PROGRESSIVE PATTERN /GFS AND SOME ENSEMBLE
MEMBERS/ WOULD KEEP IT TOO FAR OFFSHORE. WILL NEED TO MONITOR ONCE
SHORTWAVE ENERGY IN THE PACIFIC AND ARCTIC ARE BETTER SAMPLED.
TOWARD THE MIDDLE OF NEXT WEEK...
IN EITHER CASE...ANOTHER ROUND OF ARCTIC HIGH PRES LOOKS TO
SETTLE ACROSS THE REGION AS ANY STORM SYSTEM MOVES FURTHER
OFFSHORE...SO A PERIOD OF TEMPERATURES BELOW NORMAL LOOKS
POSSIBLE.
&&
.AVIATION /15Z WEDNESDAY THROUGH SUNDAY/...
LOW...LESS THAN 30 PERCENT.
MODERATE...30 TO 60 PERCENT.
HIGH...GREATER THAN 60 PERCENT.
SHORT TERM...THROUGH THURSDAY.
TODAY...HIGH CONFIDENCE IN TRENDS...LOWER CONFIDENCE IN EXACT
TIMING.
VFR TO START THE MORNING. A FEW LIGHT SHOWERS POSSIBLE MAINLY
TERMINALS N OF ROUTE 2 THIS MORNING...BUT SUSPECT BULK OF THE
MORNING REMAINS DRY. EXPECTING CONDITIONS TO GRADUALLY LOWER TO
MVFR THIS AFTERNOON...THEN TO IFR FROM ABOUT 17Z-21Z ACROSS THE
WESTERN HALF OF SOUTHERN NEW ENGLAND AS RAIN ARRIVES. RAINFALL
BECOMES HEAVIER THIS EVENING WITH MOST LOCATIONS SEEING IFR
CONDITIONS AFTER 22Z. MAY SEE POCKETS OF LLWS OUT OF THE S AT
TIMES THIS AFTERNOON...MOSTLY CAPE/ISLAND TERMINALS.
TONIGHT...ASIDE FROM SLIGHT ADJUSTMENTS TO TIMING...MOSTLY ON
TRACK FOR 12Z UPDATE....MAINLY IFR WITH SOME MVFR CONDITIONS.
RAIN TRANSITIONS TO SNOW FROM NORTHWEST TO SOUTHEAST AS THE NIGHT
WEARS ON. A BRIEF PERIOD OF SLEET/FREEZING RAIN IS POSSIBLE DURING
THE TRANSITION ESPECIALLY NORTH OF THE MA TURNPIKE. NORTHERLY
WINDS WILL GUST BETWEEN 20 AND 30 KNOTS BEHIND THE STORM BY LATE
EVENING INTO THE OVERNIGHT HOURS. SOME LLWS POSSIBLE AS WINDS
SHIFT TO THE NW RAPIDLY.
THURSDAY...MVFR TO IFR CONDITIONS IN SNOW SHOWERS IN THE MORNING
SHOULD IMPROVE SOME DURING THE AFTERNOON FROM WEST TO EAST. EXPECT
CONDITIONS TO IMPROVE TO MVFR IF NOT VFR BY MID TO LATE AFTERNOON.
NORTHWEST WIND GUSTS OF 30 TO 45 KNOTS EXPECTED.
PRELIMINARY SNOWFALL FORECAST...
BOS...1 TO 2 INCHES OVERNIGHT/THU AM
PVD...1/2 TO 2 INCHES OVERNIGHT/THU AM
BDL...1/2 TO 2 INCHES OVERNIGHT/THU AM
ORH...1-3 INCHES LATE OVERNIGHT/THU AM
MHT...2-5 INCHES LATE OVERNIGHT/THU AM
KBOS TERMINAL...HIGH CONFIDENCE IN TAF THROUGH 18Z TODAY.
MODERATE CONFIDENCE THEREAFTER. RAIN TRANSITIONS TO A BRIEF PERIOD
OF SLEET/FREEZING RAIN BETWEEN 04Z AND 06Z TONIGHT. THEN A CHANGE
TO ALL SNOW BETWEEN 06Z AND 08Z.
KBDL TERMINAL...HIGH CONFIDENCE IN TAF THROUGH 18Z TODAY.
MODERATE CONFIDENCE THEREAFTER. RAIN TRANSITIONS TO SNOW BETWEEN
02Z AND 05Z TONIGHT WITH A BRIEF PERIOD OF SLEET/FREEZING RAIN
POSSIBLE DURING THE TRANSITION.
OUTLOOK...THURSDAY NIGHT THROUGH SUNDAY.
THU NIGHT THROUGH FRI NIGHT...HIGH CONFIDENCE.
MAINLY VFR. STRONG NW WINDS DIMINISH THU NIGHT THEN SHIFT BACK TO
THE SW ON FRI AND FRI NIGHT.
SAT...MODERATE CONFIDENCE.
MAINLY VFR...BUT OCCASIONAL MVFR POSSIBLE IN LIGHT RAIN/SNOW
SHOWERS AHEAD OF A COLD FRONT.
SUN...MODERATE CONFIDENCE.
MAINLY VFR...BUT LOW PROBABILITY OF A LATE DAY OCEAN LOW PRES
LEADING TO SOME SNOW SHOWERS PARTICULARLY SE MASS. MVFR/IFR WOULD
BE POSSIBLE SHOULD THIS OCCUR.
&&
.MARINE...
FORECASTER CONFIDENCE LEVELS...
LOW...LESS THAN 30 PERCENT.
MODERATE...30 TO 60 PERCENT.
HIGH...GREATER THAN 60 PERCENT.
SHORT TERM /TONIGHT THROUGH THURSDAY/...HIGH CONFIDENCE.
TODAY...WINDS/SEAS WILL BE BELOW SCA THRESHOLDS THROUGH THE MORNING.
SOUTHERLY FLOW AHEAD OF LOW PRESSURE WILL RESULT IN 20 TO 25 KNOT
GUSTS AND 3 TO 6 FOOT SEAS DEVELOP DURING THE AFTERNOON ACROSS THE
SOUTHERN ATLANTIC WATERS.
TONIGHT AND THURSDAY...NORTHWEST GALE FORCE WIND GUSTS OF 40 KNOTS
DEVELOP LATE TONIGHT AND THURSDAY AS INTENSE LOW PRESSURE PASSES TO
OUR EAST. IN ADDITION...MODERATE FREEZING SPRAY WILL DEVELOP DURING
THU AFTERNOON AS AN USUALLY COLD AIR MASS FOR MID MARCH INVADES THE
REGION. LATER SHIFTS WILL LIKELY NEED TO ISSUE A FREEZING SPRAY
ADVISORY. IN ADDITION...SEAS ACROSS THE EASTERN ATLANTIC WATERS
WILL BUILD TO BETWEEN 7 AND 13 FEET ON THURSDAY.
OUTLOOK...THURSDAY NIGHT THROUGH SUNDAY...
THURSDAY NIGHT...MODERATE CONFIDENCE NW GALES LIKELY ALONG WITH
MODERATE FREEZING SPRAY POSSIBLE BY LATE DAY THU. VSBY REDUCED IN
LIGHT SNOW DURING THE DAY. VERY ROUGH SEAS ESPECIALLY SOUTH WATERS
FROM LEFTOVER SOUTH SWELLS COMBINING WITH NEW NW WIND WAVES.
FRI...MODERATE CONFIDENCE.
NW WIND BECOMING SW DURING THE AFTERNOON. A FEW GUSTS TO 25 KT
POSSIBLE DURING THE AFTERNOON...WITH SEAS REMAINING ELEVATED ABOVE
5 FT ESPECIALLY ON THE OCEAN WATERS.
FRI NIGHT INTO SAT...MODERATE CONFIDENCE.
SW WINDS SHIFT TO THE W DURING THE DAY SATE. GUSTS SHOULD
GENERALLY REMAIN BELOW SMALL CRAFT CRITERIA BUT A BUILDING SWELL
OF 5-7 FT EXPECTED ON THE OCEAN WATERS.
SUN...
MODEST NW WIND MAY INCREASE BY SUN EVENING. DRY AND GOOD VSBY.
&&
.TIDES/COASTAL FLOODING...
NO FLOODING EXPECTED GIVEN RELATIVELY LOW ASTRO TIDES AND NOT MUCH
WIND AND SURGE ANTICIPATED AS TRACK OF SURFACE LOW PRESSURE LOOKS
TO BE DIRECTLY OVER SRN NEW ENGLAND. THIS WILL LIMIT THE ABILITY
FOR FETCH IN ANY ONE DIRECTION.
&&
.CLIMATE...
NEAR RECORD COLD POSSIBLE THU NIGHT INTO EARLY FRIDAY. HERE ARE
RECORD LOW TEMPERATURES FOR FRIDAY MARCH 14TH...
BOSTON.......12/1896...FORECAST LOW...14
PROVIDENCE...12/1948...FORECAST LOW...13
BRADLEY ARPT..7/1948...FORECAST LOW...9
WORCESTER.....4/1948...FORECAST LOW...8
&&
.BOX WATCHES/WARNINGS/ADVISORIES...
CT...WINTER WEATHER ADVISORY FROM 10 PM THIS EVENING TO NOON EDT
THURSDAY FOR CTZ002>004.
MA...WINTER WEATHER ADVISORY FROM 4 PM THIS AFTERNOON TO NOON EDT
THURSDAY FOR MAZ002-003.
WINTER WEATHER ADVISORY FROM 10 PM THIS EVENING TO NOON EDT
THURSDAY FOR MAZ004>019-026.
NH...WINTER WEATHER ADVISORY FROM 4 PM THIS AFTERNOON TO NOON EDT
THURSDAY FOR NHZ011-012-015.
RI...WINTER WEATHER ADVISORY FROM 10 PM THIS EVENING TO NOON EDT
THURSDAY FOR RIZ001>005.
MARINE...GALE WARNING FROM 8 AM TO 8 PM EDT THURSDAY FOR ANZ232>235-237-
254>256.
GALE WARNING FROM 5 AM TO 8 PM EDT THURSDAY FOR ANZ230-236.
GALE WARNING FROM 2 AM TO 8 PM EDT THURSDAY FOR ANZ231-250-251.
&&
$$
SYNOPSIS...FRANK/DOODY
NEAR TERM...BELK/FRANK/DOODY
SHORT TERM...FRANK
LONG TERM...DOODY
AVIATION...BELK/FRANK/DOODY
MARINE...FRANK/DOODY
TIDES/COASTAL FLOODING...STAFF
CLIMATE...STAFF
AREA FORECAST DISCUSSION
NWS MOUNT HOLLY NJ
927 AM EDT WED MAR 12 2014
.SYNOPSIS...
LOW PRESSURE IN SOUTHERN OHIO LATE THIS MORNING WILL INTENSIFY VERY
RAPIDLY AS IT CROSSES NORTHERN NEW JERSEY THIS EVENING. IT WILL
WHIP A VERY STRONG COLD FRONT ACROSS OUR AREA WITH THE STORM THEN
RACING TO NOVA SCOTIA THURSDAY MORNING. LOW PRESSURE IN EASTERN
CANADA FRIDAY AND SATURDAY WILL SEND ANOTHER COLD FRONT THROUGH
THE MID ATLANTIC STATES EARLY SUNDAY. LOW PRESSURE THEN DEVELOPS
ALONG THE SOUTHEAST COAST OF THE UNITED STATES NEXT MONDAY AND
TUESDAY AND COULD PASS CLOSE TO OUR REGION.
&&
.NEAR TERM /UNTIL 6 PM THIS EVENING/...
HIGH RESOLUTION MODELS SUCH AS THE HRRR SHOW THE PRIMARY AXIS OF
PRECIPITATION ASSOCIATED WITH THE WAA GENERALLY NW OF OUR REGION
THROUGH ABOUT 18Z. AFTER 18Z, COULD START TO SEE SHOWERS SPREADING
FROM DELMARVA AND POCONOS ACROSS THE REST OF THE REGION. HOWEVER,
GIVEN THE LIMITED INSTABILITY, IT STILL LOOKS LIKE THE MAIN SHOW
WILL BE WITH THE COLD FRONT.
GUSTY SSW WINDS TO 25 MPH POSSIBLE PHL AREA SOUTHWARD AFTER 3 PM.
IAD 12Z SOUNDING OFFERS 73F FOR FULL SS. OUR FCST MAX TEMPS LOOK
GOOD AT THIS TIME.
AT 1030AM WE MAY ISSUE A FLASH FREEZE SPS FOR THE POCONOS TO
BEGIN IN THE 7 PM TIME FRAME AS SHOWERY RAINS CHANGE TO FREEZING
PRECIPITATION AND END BUT MOISTURE ON ROADS QUICKLY ICES OVER.
&&
.SHORT TERM /6 PM THIS EVENING THROUGH 6 AM THURSDAY/...
COLD FRONT SHOULD SWEEP THROUGH THE REGION BETWEEN 22 AND 03Z.
FORCING WITH THE COLD FRONT SHOULD BE ENOUGH TO OVERCOME THE
STRONGLY SHEARED ENVIRONMENT FOR LINEAR CONVECTIVE SYSTEM. THINK THE
SEVERE RISK WILL BE PRIMARILY OVER DELMARVA, FAR SE PA, AND S NJ
WHERE THE CLOUDS WILL BE LAST TO ARRIVE, THUS WILL HAVE A BIT MORE
HEATING TO ENHANCE THE INSTABILITY.
THEN THE ATTENTION TURNS TO THE WINDS. THE STRONGEST WINDS ON LAND
ARE EXPECTED IN THE POCONOS, WHERE TERRAIN EFFECTS WILL HELP MIXING,
AND IN THE SOUTHERN HALF OF THE CWA WHERE THE ISALLOBARIC WIND
COMPONENT IS EXPECTED TO BE THE STRONGEST. HAVE ISSUED A WIND
ADVISORY FOR THESE LOCATIONS. THERE IS SOME RISK OF HIGH WIND
WARNING FOR CAPE MAY AND COASTAL SUSSEX DUE TO THE FUNNELING EFFECTS
THROUGH THE BAY, BUT WILL HOLD OFF ON THAT FOR NOW UNTIL WE SEE THE
TREND OF UPSTREAM OBS BEHIND THE FRONT.
&&
.LONG TERM /THURSDAY THROUGH TUESDAY/...
AT THE START OF THE LONGTERM WE WILL BE DEALING WITH THE RAPID
COOL-DOWN BEHIND THE INTENSE COLD FRONT AS IT MOVES WELL TO OUR
EAST. WE WILL BE DRY BUT WITH LINGERING GUSTS AROUND 25 TO 30MPH AND
TEMPERATURES NEARLY 20 DEGREES COLDER THAN NORMAL, WIND CHILL VALUES
WILL REMAIN IN THE SINGLE DIGITS, POSSIBLY BELOW ZERO ACROSS THE
NORTHERN ZONES, FOR MOST OF THE DAY.
THE GOOD NEWS IS WE REALLY ONLY HAVE ONE DAY TO DEAL WITH THE ABRUPT
COLD SHOT, THE BAD NEWS IS THAT THE WARMING TREND INTO THE WEEKEND
LOOKS TO BE FLEETING, CREATING ANOTHER ROLLER COASTER EFFECT AS WE
HEAD INTO THE NEW WORK WEEK. SOUTHWEST WINDS AHEAD OF THE NEXT COLD
FRONT, PROGGED TO MOVE THROUGH LATER ON SATURDAY, WILL ALLOW
TEMPERATURES TO CLIMB CLOSER TO NORMAL ON FRIDAY AND EVEN SLIGHTLY
HIGHER ON SATURDAY. MUCH LIKE LAST WEEKEND, THE FRONTAL BOUNDARY ON
SATURDAY IS NOT ALL THAT STRONG WITH LIMITED MOISTURE WITH MORE
SPLIT FLOW EXPECTED. DO CARRY SLIGHT CHANCE POPS ACROSS THE NORTH
WITH A FEW HUNDREDTHS OF PRECIPITATION POSSIBLE. THERMAL FIELDS
WOULD ALLOW FOR SOME LIGHT SNOW SHOWERS ACROSS THE HIGHER TERRAIN
AND A MIX CHANGING TO RAIN FURTHER SOUTH. SREF AND GEFS PROBS KEEP
THE SOUTHERN HALF OF THE CWA DRY AT THIS TIME.
SUNDAY WILL FEATURE AMPLE SUNSHINE AND A NEW COOLER AIRMASS. HIGH
PRESSURE ACROSS THE UPPER MID-WEST SLIDES TO OUR NORTH HELPING TO
REINFORCE COOLER TEMPERATURES. THIS WILL YIELD HIGHS SLIGHTLY BELOW
AVERAGE. THE NEXT SYSTEM OF INTEREST BEGINS TO DEVELOP ALONG THE
FRONTAL BOUNDARY THAT JUST DRAPED THROUGH THE REGION. THERE IS STILL
A LOT OF UNCERTAINTY WITH THIS SYSTEM AS THE MID-LEVEL PATTERN
DOESN`T PROVIDE A GOOD CONSENSUS AMONGST THE MID-RANGE GUIDANCE.
LEANED HEAVILY ON THE WPC GUIDANCE AT THIS POINT BRINGING CHANCE
POPS INTO THE REGION LATE SUNDAY NIGHT INTO MONDAY. THERMAL PROFILES
AT THIS POINT WOULD INDICATE WIDESPREAD SNOW ACROSS THE NORTHERN
HALF OF THE CWA WITH A BIT MORE MIXING ACROSS THE SOUTH. STILL
PLENTY OF TIME TO FIGURE OUT HOW THIS SYSTEM WILL TRACK.
&&
.AVIATION /13Z WEDNESDAY THROUGH SUNDAY/...
THE FOLLOWING DISCUSSION IS FOR KPHL, KPNE, KTTN, KABE, KRDG, KILG,
KMIV, KACY AND SURROUNDING AREAS.
REMAINDER OF TODAY...VFR CIGS MOSTLY AOA 10000 FT BUT EXPECT MVFR
CEILINGS TO MOVE IN FROM WEST TO EAST DURING THE AFTERNOON. MVFR
VISIBILITIES WILL BE POSSIBLE WITH SHRA LATE IN THE DAY. THERE IS
A RISK FOR ISOLATED TSRA BETWEEN 22Z AND 02Z NEAR THE COLD FRONTAL
PASSAGE. OTHERWISE THE GRADIENT SSW WIND MAY GUST 25 KT AFTER 20Z
KPHL REGION SOUTHWARD OTRW SE WINDS BECOMING S ELSEWHERE.
TONIGHT...THE COLD FRONT THIS EVENING WILL BRING AN ABRUPT WIND SHIFT
TO NW WITH GUSTS 30-40 KT. CONDITIONS SHOULD IMPROVE TO MAINLY VFR
CIGS AOA 3000 FT WITHIN A FEW HOURS OF THE WIND SHIFT TO WEST
NORTHWEST.
OUTLOOK...
THURSDAY...VFR. GUSTY NORTHWEST WINDS AROUND 30 TO 35 KNOTS
POSSIBLE.
FRIDAY...VFR. WINDS VEER TOWARDS THE SOUTHWEST AND COULD BE GUSTY AT
TIMES.
SATURDAY...MOSTLY VFR. COLD FRONT WILL CROSS THE REGION ON SATURDAY
WITH SUB-VFR POSSIBLE IN RAIN SHOWERS.
SUNDAY...VFR.
&&
.MARINE...
WINDS AND SEAS WILL CONTINUE TO INCREASE THROUGH THE DAY. HOWEVER,
THE STRONGEST WINDS ARE EXPECTED WITH AND BEHIND THE COLD FRONT
WHICH SHOULD ARRIVE THIS EVENING. WINDS WILL STAY UP FOR MUCH OF THE
NIGHT. GALES ARE EXPECTED ACROSS THE REGION, AND STORM FORCE WINDS
POSSIBLE IN THE LOWER DE BAY AND ADJACENT OCEAN WATERS DUE TO THE
FUNNELING EFFECTS. WINDS ARE NOT EXPECTED TO SUBSTANTIALLY SUBSIDE
OVERNIGHT.
OUTLOOK...
THURSDAY...CONTINUATION OF GALES THROUGH THE EVENING HOURS
DROPPING TO SCA THEREAFTER.
FRIDAY...SCA LIKELY WITH WINDS VEERING TOWARDS THE SOUTHWEST.
SATURDAY - SUNDAY...SUB-SCA CONDITIONS EXPECTED BY LATE SATURDAY
MORNING. WINDS SHIFT BACK TOWARDS THE WEST-NORTHWEST BEHIND A COLD
FRONT LATER ON SATURDAY.
&&
.HYDROLOGY...
OPERATIONAL QPF AMOUNTS ARE NOT EXPECTED TO MAKE ANY OF OUR RIVERS
REACH FLOOD LEVELS, THERE WILL BE RISES DUE TO THE COMBINED RAINFALL
AND MELT OFF OF THE SNOW ACROSS THE NORTHERN HALF OF THE AREA.
WITH ANY THUNDERSTORMS LATE IN THE DAY, THERE COULD ALSO BE SOME
HEAVY RAINFALL THAT COULD PRODUCE URBAN AND POOR DRAINAGE TYPE
FLOODING.
SOMETHING TO KEEP AN EYE...PER THE HYDRO ENSEMBLES, WHICH ARE RUNNING
WITH MORE RAINFALL THAN OPERATIONAL SOLUTIONS, 1.00 TO 1.50 INCHES
OF BASIN-WIDE RAINFALL WOULD INCREASE THE FLOOD THREAT ACROSS THE
NORTHERN HALF OF THE HSA.
LUCKILY, WE DO HAVE SOME WIGGLE ROOM WITH 0.50 TO 0.75 INCHES IN THE
FORECAST.
&&
.EQUIPMENT...
NWR...NO TONE ALERT TEST TODAY DUE TO POTENTIAL FOR REAL TIME WATCHES
AND WARNING ISSUANCE`S THIS AFTERNOON. NWR TONE ALERT POSTPONED TIL
THURSDAY FORENOON. PNS AND FB POSTED AS WELL.
&&
.PHI WATCHES/WARNINGS/ADVISORIES...
PA...WIND ADVISORY FROM 6 PM THIS EVENING TO 11 AM EDT THURSDAY FOR
PAZ054-055-060>062-070-071-101>104.
NJ...WIND ADVISORY FROM 6 PM THIS EVENING TO 11 AM EDT THURSDAY FOR
NJZ016>018-021>025.
DE...WIND ADVISORY FROM 6 PM THIS EVENING TO 11 AM EDT THURSDAY FOR
DEZ001>004.
MD...WIND ADVISORY FROM 6 PM THIS EVENING TO 11 AM EDT THURSDAY FOR
MDZ008-012-015-019-020.
MARINE...GALE WARNING FROM 7 PM THIS EVENING TO 1 AM EDT FRIDAY FOR
ANZ450>452.
STORM WARNING FROM 11 PM THIS EVENING TO 11 AM EDT THURSDAY
FOR ANZ431-453>455.
GALE WARNING FROM 7 PM THIS EVENING TO 8 PM EDT THURSDAY FOR
ANZ430.
&&
$$
SYNOPSIS...DRAG 927
NEAR TERM...DRAG/JOHNSON 927
SHORT TERM...JOHNSON
LONG TERM...HEAVENER
AVIATION...DRAG/HEAVENER/JOHNSON 927
MARINE...DRAG/HEAVENER/JOHNSON
HYDROLOGY...927
EQUIPMENT...GAINES/GORSE 927
AREA FORECAST DISCUSSION
NWS MOUNT HOLLY NJ
420 AM EDT WED MAR 12 2014
.SYNOPSIS...
LOW PRESSURE IN THE MID MISSISSIPPI VALLEY WILL INTENSIFY RAPIDLY AS
IT ARRIVES IN SOUTHERN OHIO THIS MORNING, THEN ACROSS NORTHERN NEW
JERSEY LATER THIS EVENING. A VERY STRONG COLD FRONT WILL WHIP ACROSS OUR
AREA WEDNESDAY EVENING, WITH THE STORM THEN RACING TO NOVA SCOTIA
THURSDAY MORNING. LOW PRESSURE IN EASTERN CANADA FRIDAY AND SATURDAY
WILL SEND ANOTHER COLD FRONT THROUGH THE MID ATLANTIC STATES EARLY
SUNDAY. LOW PRESSURE THEN DEVELOPS ALONG THE SOUTHEAST COAST OF THE
UNITED STATES NEXT MONDAY AND TUESDAY AND COULD PASS CLOSE TO OUR
REGION.
&&
.NEAR TERM /UNTIL 6 PM THIS EVENING/...
HIGH RESOLUTION MODELS SUCH AS THE HRRR SHOW THE PRIMARY AXIS OF
PRECIPITATION ASSOCIATED WITH THE WAA GENERALLY NW OF OUR REGION
THROUGH ABOUT 18Z. AFTER 18Z, COULD START TO SEE SHOWERS SPREADING
FROM DELMARVA AND POCONOS ACROSS THE REST OF THE REGION. HOWEVER,
GIVEN THE LIMITED INSTABILITY, IT STILL LOOKS LIKE THE MAIN SHOW
WILL BE WITH THE COLD FRONT.
&&
.SHORT TERM /6 PM THIS EVENING THROUGH 6 AM THURSDAY/...
COLD FRONT SHOULD SWEEP THROUGH THE REGION BETWEEN 22 AND 03Z.
FORCING WITH THE COLD FRONT SHOULD BE ENOUGH TO OVERCOME THE
STRONGLY SHEARED ENVIRONMENT FOR LINEAR CONVECTIVE SYSTEM. THINK THE
SEVERE RISK WILL BE PRIMARILY OVER DELMARVA, FAR SE PA, AND S NJ
WHERE THE CLOUDS WILL BE LAST TO ARRIVE, THUS WILL HAVE A BIT MORE
HEATING TO ENHANCE THE INSTABILITY.
THEN THE ATTENTION TURNS TO THE WINDS. THE STRONGEST WINDS ON LAND
ARE EXPECTED IN THE POCONOS, WHERE TERRAIN EFFECTS WILL HELP MIXING,
AND IN THE SOUTHERN HALF OF THE CWA WHERE THE ISALLOBARIC WIND
COMPONENT IS EXPECTED TO BE THE STRONGEST. HAVE ISSUED A WIND
ADVISORY FOR THESE LOCATIONS. THERE IS SOME RISK OF HIGH WIND
WARNING FOR CAPE MAY AND COASTAL SUSSEX DUE TO THE FUNNELING EFFECTS
THROUGH THE BAY, BUT WILL HOLD OFF ON THAT FOR NOW UNTIL WE SEE THE
TREND OF UPSTREAM OBS BEHIND THE FRONT.
&&
.LONG TERM /THURSDAY THROUGH TUESDAY/...
AT THE START OF THE LONGTERM WE WILL BE DEALING WITH THE RAPID
COOL-DOWN BEHIND THE INTENSE COLD FRONT AS IT MOVES WELL TO OUR
EAST. WE WILL BE DRY BUT WITH LINGERING GUSTS AROUND 25 TO 30MPH AND
TEMPERATURES NEARLY 20 DEGREES COLDER THAN NORMAL, WIND CHILL VALUES
WILL REMAIN IN THE SINGLE DIGITS, POSSIBLY BELOW ZERO ACROSS THE
NORTHERN ZONES, FOR MOST OF THE DAY.
THE GOOD NEWS IS WE REALLY ONLY HAVE ONE DAY TO DEAL WITH THE ABRUPT
COLD SHOT, THE BAD NEWS IS THAT THE WARMING TREND INTO THE WEEKEND
LOOKS TO BE FLEETING, CREATING ANOTHER ROLLER COASTER EFFECT AS WE
HEAD INTO THE NEW WORK WEEK. SOUTHWEST WINDS AHEAD OF THE NEXT COLD
FRONT, PROGGED TO MOVE THROUGH LATER ON SATURDAY, WILL ALLOW
TEMPERATURES TO CLIMB CLOSER TO NORMAL ON FRIDAY AND EVEN SLIGHTLY
HIGHER ON SATURDAY. MUCH LIKE LAST WEEKEND, THE FRONTAL BOUNDARY ON
SATURDAY IS NOT ALL THAT STRONG WITH LIMITED MOISTURE WITH MORE
SPLIT FLOW EXPECTED. DO CARRY SLIGHT CHANCE POPS ACROSS THE NORTH
WITH A FEW HUNDREDTHS OF PRECIPITATION POSSIBLE. THERMAL FIELDS
WOULD ALLOW FOR SOME LIGHT SNOW SHOWERS ACROSS THE HIGHER TERRAIN
AND A MIX CHANGING TO RAIN FURTHER SOUTH. SREF AND GEFS PROBS KEEP
THE SOUTHERN HALF OF THE CWA DRY AT THIS TIME.
SUNDAY WILL FEATURE AMPLE SUNSHINE AND A NEW COOLER AIRMASS. HIGH
PRESSURE ACROSS THE UPPER MID-WEST SLIDES TO OUR NORTH HELPING TO
REINFORCE COOLER TEMPERATURES. THIS WILL YIELD HIGHS SLIGHTLY BELOW
AVERAGE. THE NEXT SYSTEM OF INTEREST BEGINS TO DEVELOP ALONG THE
FRONTAL BOUNDARY THAT JUST DRAPED THROUGH THE REGION. THERE IS STILL
A LOT OF UNCERTAINTY WITH THIS SYSTEM AS THE MID-LEVEL PATTERN
DOESN`T PROVIDE A GOOD CONSENSUS AMONGST THE MID-RANGE GUIDANCE.
LEANED HEAVILY ON THE WPC GUIDANCE AT THIS POINT BRINGING CHANCE
POPS INTO THE REGION LATE SUNDAY NIGHT INTO MONDAY. THERMAL PROFILES
AT THIS POINT WOULD INDICATE WIDESPREAD SNOW ACROSS THE NORTHERN
HALF OF THE CWA WITH A BIT MORE MIXING ACROSS THE SOUTH. STILL
PLENTY OF TIME TO FIGURE OUT HOW THIS SYSTEM WILL TRACK.
&&
.AVIATION /08Z WEDNESDAY THROUGH SUNDAY/...
THE FOLLOWING DISCUSSION IS FOR KPHL, KPNE, KTTN, KABE, KRDG, KILG,
KMIV, KACY AND SURROUNDING AREAS.
STARTING OFF WITH VFR CONDITIONS, BUT EXPECT MVFR CEILINGS TO MOVE
IN FROM WEST TO EAST THROUGH THE DAY. ALSO MVFR VISIBILITIES WILL BE
POSSIBLE WITH SHRA THROUGH THE DAY. THERE IS A RISK FOR ISOLATED
TSRA THROUGH 21Z, BUT COVERAGE IS EXPECTED TO BE TOO LIMITED TO
INCLUDE IN THE TAFS FOR NOW. TSRA IS MORE LIKELY WITH AND JUST
BEHIND THE COLD FRONT THAT SHOULD BE SWEEPING THROUGH THE REGION
BETWEEN 22 AND 03Z. THE COLD FRONT WILL ALSO BRING AN ABRUPT SHIFT
FROM BREEZY S OR SE WINDS TO GUSTY NW WINDS. CONDITIONS SHOULD
IMPROVE TO VFR WITHIN A FEW HOURS OF THE FRONT, BUT WINDS MAY NOT
DIMINISH UNTIL NEAR SUNRISE.
OUTLOOK...
THURSDAY...VFR. GUSTY NORTHWEST WINDS AROUND 30 TO 35 KNOTS
POSSIBLE.
FRIDAY...VFR. WINDS VEER TOWARDS THE SOUTHWEST AND COULD BE GUSTY AT
TIMES.
SATURDAY...MOSTLY VFR. COLD FRONT WILL CROSS THE REGION ON SATURDAY
WITH SUB-VFR POSSIBLE IN RAIN SHOWERS.
SUNDAY...VFR.
&&
.MARINE...
WINDS AND SEAS WILL CONTINUE TO INCREASE THROUGH THE DAY. HOWEVER,
THE STRONGEST WINDS ARE EXPECTED WITH AND BEHIND THE COLD FRONT
WHICH SHOULD ARRIVE THIS EVENING. WINDS WILL STAY UP FOR MUCH OF THE
NIGHT. GALES ARE EXPECTED ACROSS THE REGION, AND STORM FORCE WINDS
POSSIBLE IN THE LOWER DE BAY AND ADJACENT OCEAN WATERS DUE TO THE
FUNNELING EFFECTS. WINDS ARE NOT EXPECTED TO SUBSTANTIALLY SUBSIDE
OVERNIGHT.
OUTLOOK...
THURSDAY...CONTINUATION OF GALES THROUGH THE EVENING HOURS
DROPPING TO SCA THEREAFTER.
FRIDAY...SCA LIKELY WITH WINDS VEERING TOWARDS THE SOUTHWEST.
SATURDAY - SUNDAY...SUB-SCA CONDITIONS EXPECTED BY LATE SATURDAY
MORNING. WINDS SHIFT BACK TOWARDS THE WEST-NORTHWEST BEHIND A COLD
FRONT LATER ON SATURDAY.
&&
.PHI WATCHES/WARNINGS/ADVISORIES...
PA...WIND ADVISORY FROM 6 PM THIS EVENING TO 11 AM EDT THURSDAY FOR
PAZ054-055-060>062-070-071-101>104.
NJ...WIND ADVISORY FROM 6 PM THIS EVENING TO 11 AM EDT THURSDAY FOR
NJZ016>018-021>025.
DE...WIND ADVISORY FROM 6 PM THIS EVENING TO 11 AM EDT THURSDAY FOR
DEZ001>004.
MD...WIND ADVISORY FROM 6 PM THIS EVENING TO 11 AM EDT THURSDAY FOR
MDZ008-012-015-019-020.
MARINE...GALE WARNING FROM 7 PM THIS EVENING TO 1 AM EDT FRIDAY FOR
ANZ450>452.
STORM WARNING FROM 11 PM THIS EVENING TO 11 AM EDT THURSDAY
FOR ANZ431-453>455.
GALE WARNING FROM 7 PM THIS EVENING TO 8 PM EDT THURSDAY FOR
ANZ430.
&&
$$
SYNOPSIS...DRAG/GORSE
NEAR TERM...JOHNSON
SHORT TERM...JOHNSON
LONG TERM...HEAVENER
AVIATION...HEAVENER/JOHNSON
MARINE...HEAVENER/JOHNSON
AREA FORECAST DISCUSSION
NWS MELBOURNE FL
950 AM EDT WED MAR 12 2014
.DISCUSSION...
...WINDY AND VERY WARM TODAY WITH SHOWERS AND A FEW STORMS...
CURRENT...DEEPENING WINTER STORM OVER THE OH VALLEY CONTINUES TO
MOVE ENE TOWARD THE MID ATLC STATES...WITH A WEAK SURFACE TROUGH
OVER THE SERN CONUS BISECTING THE FL PANHANDLE THIS MORNING. THE
TIGHTENING LCL PGRAD IS CAUSING SW SFC WINDS TO STRENGTHEN OVER THE
PENINSULA. WATERVAPOR IMAGERY AND RUC ANLYS FIELDS SHOW A RAPIDLY
DEFORMING MID-UPPER LEVEL TROUGH OVER NORTH FL...WHICH IS POISED TO
QUICKLY MOVE ENE-NE OFF THE SERN SEABOARD BY AROUND NOON. LOCAL 88D
DATA SHOWS SHOWERS AND A FEW TS WHICH DEVELOPED OVERNIGHT INTO THIS
MORNING IN FAVORABLE MID LEVEL PVA/FORCED ASCENT MOVING RAPIDLY E TO
ENE ACROSS THE NORTHERN HALF CWA.
MORNING RAOBS HAVE CAPTURED THE MID LEVEL COOL POCKET WELL...WITH
H50 TEMPS -13C TO -14C CREATING H85-H50 LAPSE RATES SUPPORTIVE OF
SPORADIC CONVECTIVE CELLS BECOMING DEEP ENOUGH TO PRODUCE TS/LTG.
IN ADDITION...DEEP LAYER WIND FIELDS HAVE ALSO STRENGTHENED TO WHERE
STEERING WINDS ARE IN THE 40-50KT (45-55+MPH) RANGE FOR PRECIP.
FORTUNATELY...DOWNDRAFTS DO NOT APPEAR TO BE VIGOROUS GIVEN THE
TIME OF DAY AS HAVEN`T SEEN SFC STRONG CONVECTIVE GUSTS BENEATH ANY
CELLS AS OF YET.
REST OF TODAY...TROUGH EXITS STAGE RIGHT AS DIURNAL HEATING HEADS
TOWARD IT PEAK. THIS PUTS THE TWO PRIMARY CONVECTIVE PARAMETERS
ABOUT 4-6HR OUT OF PHASE FROM WORKING IN TANDEM TO PRODUCE A PRETTY
DECENT EVENT. WHILE WIND FIELDS WILL REMAIN ROBUST...THE WEAKENING/
DEPARTING TROUGH WILL SPELL RISING MID LEVEL HGTS/TEMPS..WEAKENING
THE SFC TROUGH AND ASCD CONVGC ZONE. ADDITIONALLY...H25 DIVG HAS
ALREADY PUSHED OFFSHORE. THIS ALL PORTENDS AN INCREASINGLY
UNFAVORABLE DYNAMICAL ENVIRONMENT FOR ISOLD STORMS BECOMING STRONG
BY THIS AFTERNOON.
ALL IN ALL...THE EVENT HAS BEEN WELL-HANDLED BY THE LAST COUPLE DAYS
OF FORECASTS. LAKE WIND ADVISORY IS ALREADY UP...AND THAT LOOKS TO
VERIFY NICELY. ABOUT THE ONLY TWEAK NEEDED WILL BE TO NUDGE POPS
ACROSS THE NORTH AND CENTRAL UPWARD TO ACCOUNT FOR ONGOING ACTIVITY.
&&
.AVIATION...CONVECTIVE SHOWERS AND A FEW TS TO PRODUCE LCL IFR
CONDITIONS...BUT COVERAGE PROBABLY WARRANTS TEMPO MVFR CIGS/VSBYS
FROM ABOUT MLB NWD.
&&
.MARINE...NO CHGS NEEDED AS THE CAUTIONARY STMT BEYOND 20NM
OFFSHORE WILL BE FOLLOWED BY AN SCA BY THIS EVENING. THE SCA WILL
EXPAND TO COVER THE ENTIRE MAOR BY 03Z/11PM TONIGHT.
&&
SHORT TERM/AVIATION...CRISTALDI
LONG TERM/IMPACT WX/RADAR...SEDLOCK
&&
.PREV DISCUSSION... /ISSUED 417 AM EDT WED MAR 12 2014/
...STRONG COLD FRONT TONIGHT WILL BRING MUCH COOLER WEATHER THROUGH
THURSDAY NIGHT...
...HAZARDOUS MARINE CONDITIONS DEVELOPING TONIGHT INTO THURSDAY...
TONIGHT...WESTERLY FLOW IN THE EVENING WILL BECOME NW OVERNIGHT AS
THE COLD FRONT MOVES INTO E CENTRAL FL TOWARD MIDNIGHT ACROSS NRN
SECTIONS AND THEN THROUGH THE AREA OVERNIGHT. SHOULD SEE SOME
CLOUDINESS ALONG THE FRONTAL BOUNDARY BUT MOISTURE DEPTH LOOKS TOO
SCANT TO INCLUDE SHOWER MENTION. LOWS WILL RANGE FROM 45-50 ACROSS
NRN LAKE AND VOLUSIA COUNTIES TO THE UPPER 50S ACROSS INLAND ST
LUCIE AND MARTIN COUNTIES.
THU-FRI...
QUIET WX PATTERN THRU THE LATTER HALF OF THE WEEK AS THE POST
FRONTAL HI PRES RIDGE BUILDS ACRS THE GOMEX/DEEP SOUTH. TIGHT PGRAD
ACRS THE FL PENINSULA ON THU WILL GENERATE A BREEZY N/NW FLOW...
RESULTING IN A STRONG COLD AIR ADVECTION THAT WILL KEEP MAX TEMPS
ACRS MOST OF THE CWA AOB 70F...A 15-20F DEG DROP FROM WED. TEMPS
WILL BEGIN TO RECOVER THU NIGHT AS THE RIDGE AXIS BUILDS OFF THE MID
ATLC/SERN SEABOARD AND WINDS VEER TO E/NE. OCEAN MODIFIED AIR WILL
KEEP MIN TEMPS IN THE L/M50S ALONG THE IMMEDIATE COAST. INTERIOR
TEMPS...HOWEVER...WILL FALL INTO THE L/M40S ONCE AGAIN AS THE
ONSHORE BREEZE WILL NOT HAVE SUFFICIENT TIME TO PUSH THE MODIFIED
AIR MUCH FARTHER E THAN THE I-95 CORRIDOR.
AIRMASS MODIFICATION WILL CONTINUE INTO FRI AS THE RIDGE BUILDS INTO
THE W ATLC...FORCING WINDS TO VEER TO THE E/SE. MAX TEMPS IN THE
U60S/L70S ALONG THE COAST AND M70S INTERIOR.
SAT-TUE...
ZONAL JET PATTERN ACRS THE SRN TIER STATES WILL GRADUALLY TRANSITION
TO A LIFTING ORIENTATION OVER THE WEEKEND IN ADVANCE OF THE NEXT
FRONTAL TROF. WITH RIDGING OVER THE W ATLC ALREADY IN PLACE...THE
STAGE WILL BE SET FOR ANOTHER SLOW MOVING FRONTAL BNDRY THRU CENTRAL
FL THAT WILL REQUIRE AN EXTENDED PD OF PRECIP IN THE FCST INTO EARLY
NEXT WEEK.
AS THE FRONT STALLS OVER THE PANHANDLE AND WINDS VEER TO THE S/SW...
A WARM AIR ADVECTION PATTERN WILL DVLP THAT WILL PUSH TEMPS INTO THE
U70S/L80S ON SAT...THEN INTO THE L/M80S AREAWIDE ON SUN. AS THE
FRONT SLIDES INTO THE NRN PENINSULA...CLOUDS AND PERIODIC SHRAS WILL
KEEP MAX TEMPS IN THE M/U70S...WHILE PREFRONTAL TEMPS OVER THE SRN
CWA REMAIN IN THE L/M80S. MIN TEMPS GENERALLY IN THE U50S/L60S...
EXCEPT L/M60S ALONG THE TREASURE COAST
WHILE THIS PARTICULAR WX PATTERN USUALLY DOES NOT GENERATE LARGE
OUTBREAKS OF STRONG/SVR WX...CANNOT RULE TSRAS OUT COMPLETELY ESP
ACRS THE SRN CWA WHERE TEMPS WILL WARM INTO THE L/M80S DURING THE
HEAT OF THE DAY. WILL GO WITH A MIX OF SHRAS/TSRAS THRU THE PD...
CAPPING POPS ARND 40PCT SUN NIGHT INTO TUE.
&&
.AVIATION...MAINLY VFR OUTSIDE OF SCATTERED SHRA ACTIVITY TODAY.
GUSTY WSW WINDS THIS AFTERNOON WILL BECOME BREEZY FROM THE NW LATE
TONIGHT. EXPECT VFR CONDS TO CONTINUE TONIGHT WITH A FRONTAL
PASSAGE AT KMCO AROUND 07Z TONIGHT.
&&
.MARINE...
SW WINDS TO 15-20 KNOTS OFFSHORE WILL BECOME WEST BY THIS EVENING
AND THEN STRONG AND GUSTY FROM THE NW OVERNIGHT. SMALL CRAFT
ADVISORIES WILL BEGIN ACROSS THE OFFSHORE WATERS THIS EVENING AND
NEAR SHORE WATERS BY 10 PM TONIGHT AS WINDS STRENGTHEN FROM THE NW
AFTER MIDNIGHT. SEAS WILL BUILD TO 8-9 FT OFFSHORE.
THU-THU NIGHT...HAZARDOUS BOATING CONDITIONS WILL CONTINUE BUT WILL
IMPROVE SLOWLY AS THE POST FRONTAL HI PRES RIDGE BUILDS ACRS THE
GOMEX/DEEP SOUTH AND ALLOWS THE LCL PGRAD TO SLACKEN. SFC/BNDRY LYR
WINDS TO DIMINISH FROM A FRESH TO STRONG NW BREEZE AT SUNRISE TO A
MODERATE TO FRESH NRLY BREEZE AT SUNSET...THEN TO A GENTLE TO
MODERATE E/NE BREEZE OVERNIGHT. SEAS SUBSIDING FROM 6-8FT NEARSHORE
AND 8-10FT OFFSHORE TO 3-5FT NEARSHORE AND 4-6FT OFFSHORE.
FRI-FRI NIGHT...WINDS BCMG A GENTLE TO MODERATE ERLY BREEZE THRU THE
AFTN...THEN E/SE OVERNIGHT AS THE HI PRES RIDGE BUILDS ACRS THE FL
PENINSULA AND INTO THE SW ATLC. SEAS TO 3-4FT NEARSHORE AND 4-6FT
OFFSHORE SUBSIDING TO 2-4FT NEARSHORE AND 3-5FT OFFSHORE.
SAT-SUN...ATLC HI PRES RIDGE WILL BE THE DOMINANT WX FEATURE THRU
THE UPCOMING WEEKEND AS A NEW COLD FRONT PUSHES INTO THE DEEP SOUTH
AND STALLS OVER THE FL PANHANDLE. INTERACTION BTWN THESE TWO SYSTEMS
WILL GENERATE A GENTLE TO MODERATE S/SERLY BREEZE WITH SEAS 2-4FT ON
SAT SUBSIDING TO 2-3FT SUN. CHC SHRAS ON SUN N OF SEBASTIAN INLET...
SLGT CHC S OF THE INLET.
&&
.FIRE WEATHER...
MIN RHS FROM 45-50 PERCENT TODAY...BUT GUSTY WINDS FROM THE SW/WSW
IN THE AFTERNOON AND BECOMING NW OVERNIGHT WILL POSE A FIRE WX
CONCERN.
THU...STRONG POST FRONTAL DRY AIR ADVECTION WITH BREEZY N/NW
SFC/TRANSPORT WINDS...MIN RH VALUES ARND 20-25PCT INTERIOR FROM
OSCEOLA COUNTY NWD AND 30-35PCT ALONG THE COAST AND OKEECHOBEE
COUNTY.
FRI...HI PRES WILL BUILD ACRS THE FL PENINSULA AND INTO THE W
ATLC...ALLOWING WINDS TO VEER TO THE E. THE ONSHORE FLOW WILL MODIFY
THE DRY AIR...THOUGH RH VALUES BLO 35PCT WILL LINGER ALONG AND N OF
THE I-4 CORRIDOR.
&&
.CLIMATE...
RECORD HIGH TEMPS FOR TODAY...
DAB 90 1935
MCO 89 2001
MLB 90 1962
VRB 88 1962
&&
.PRELIMINARY POINT TEMPS/POPS...
DAB 83 47 63 47 / 40 10 10 0
MCO 84 51 68 45 / 40 10 10 10
MLB 85 54 65 51 / 40 10 10 10
VRB 86 58 66 52 / 40 10 10 10
LEE 83 45 66 42 / 40 10 10 0
SFB 83 50 67 45 / 40 10 10 0
ORL 83 51 67 46 / 40 10 10 10
FPR 86 60 67 53 / 40 10 10 10
&&
.MLB WATCHES/WARNINGS/ADVISORIES...
FL...LAKE WIND ADVISORY FROM 1 PM THIS AFTERNOON TO 8 PM EDT THIS
EVENING FOR COASTAL VOLUSIA-INDIAN RIVER-INLAND VOLUSIA-
MARTIN-NORTHERN BREVARD-NORTHERN LAKE-OKEECHOBEE-ORANGE-
OSCEOLA-SEMINOLE-SOUTHERN BREVARD-SOUTHERN LAKE-ST. LUCIE.
AM...SMALL CRAFT ADVISORY FROM 11 PM THIS EVENING TO 10 PM EDT
THURSDAY FOR COASTAL WATERS FROM FLAGLER BEACH TO VOLUSIA
BREVARD COUNTY LINE OUT 20 NM-COASTAL WATERS FROM SEBASTIAN
INLET TO JUPITER INLET OUT 20 NM-COASTAL WATERS FROM
VOLUSIA BREVARD COUNTY LINE TO SEBASTIAN INLET OUT 20 NM.
SMALL CRAFT ADVISORY FROM 8 PM THIS EVENING TO 4 AM EDT FRIDAY
FOR WATERS FROM FLAGLER BEACH TO VOLUSIA BREVARD COUNTY
LINE 20 TO 60 NM OFFSHORE-WATERS FROM SEBASTIAN INLET TO
JUPITER INLET 20 TO 60 NM OFFSHORE-WATERS FROM VOLUSIA
BREVARD COUNTY LINE TO SEBASTIAN INLET 20 TO 60 NM OFFSHORE.
&&
$$
AREA FORECAST DISCUSSION
NWS CHARLESTON SC
933 AM EDT WED MAR 12 2014
.SYNOPSIS...
A STRONG COLD FRONT WILL APPROACH THE AREA FROM THE WEST TODAY AND
WILL MOVE THROUGH TONIGHT...FOLLOWED BY UNSEASONABLY COOL HIGH
PRESSURE THROUGH FRIDAY. ANOTHER COLD FRONT WILL MOVE SOUTH OVER
THE WEEKEND...LIKELY PUSHING INTO SOUTHEAST SOUTH CAROLINA AND
SOUTHEAST GEORGIA SUNDAY. THE FRONT WILL EITHER STALL OVER THE
AREA OR CONTINUE PUSHING SOUTH INTO FLORIDA EARLY NEXT WEEK. AT
LEAST ONE WAVE OF LOW PRESSURE WILL DEVELOP ALONG THIS FRONT.
&&
.NEAR TERM /UNTIL 6 PM THIS EVENING/...
THROUGH MIDDAY/EARLY AFTERNOON...EXPECT BRIEF PERIODS OF SUNSHINE
EAST OF I-95... BUT WIDESPREAD WRAP-AROUND CLOUDS AND
ISOLATED/SCATTERED SHOWERS WILL PUSH THROUGH THE REGION.
OVERALL...CLOUD COVER WILL HOLD TEMPS DOWN THROUGH MIDDAY/EARLY
AFTERNOON. THEN...DEEP LAYER DRYING COULD RESULT IN DECREASING
CLOUD COVER ALLOWING TEMPERATURES WILL PUSH TO AROUND 80F BY LATE
AFTERNOON. HOWEVER...LATEST RUC SOUNDINGS SUGGESTS THAT CLOUDS
WILL PERSIST. IF THIS OCCURS...WE WILL HAVE TO LOWER TEMPERATURES
THIS AFTERNOON.
ALSO...AS SURFACE LOW PRESSURE DEEPENS NORTH OF THE REGION...THE
SURFACE PRESSURE GRADIENT WILL TIGHTEN AND LOW-LEVEL WINDS WILL
STRENGTHEN. THIS WILL TRANSLATE TO GUSTY W/SW WINDS ACROSS THE
FORECAST AREA. EVEN WITH CLOUD COVER...GUSTS 30-35 MPH SHOULD
OCCUR. IF CLOUDS BREAK UP AND ALLOW FOR WARMER TEMPS AND A DEEPER
MIXED LAYER...GUSTS AS HIGH AS 35-40 MPH COULD OCCUR. AS OF LATE
WEDNESDAY MORNING...NO PLANS TO ISSUE A WIND ADVISORY.
LAKE WINDS...SOUTHWEST WINDS WILL INCREASE TODAY INTO THE 20-25 KT
RANGE AHEAD OF AN APPROACHING COLD FRONT. A LAKE WIND ADVISORY
STARTS AT 10 AM AND RUNS THROUGH THE DAY.
&&
.SHORT TERM /6 PM THIS EVENING THROUGH SATURDAY/...
TONIGHT...THE STRONG COLD FRONT APPROACHING FROM THE WEST WILL PUSH
INTO THE AREA AND IS CURRENTLY PROGGED TO PASS THROUGH IN THE 8PM TO
MIDNIGHT TIME FRAME. CANNOT RULE OUT A FEW SHOWERS WITH FROPA.
OTHERWISE...WINDS WILL VEER TO W/NW AND REMAIN QUITE GUSTY
THROUGH MUCH OF THE OVERNIGHT IN THE STOUT COLD ADVECTION. MODELS
SHOW AT LEAST A BAND OF LOW/MID LEVEL CLOUDS ALONG THE
FRONT...WITH VERY LIGHT PRECIPITATION. I HAVE KEPT THE FORECAST
DRY DUE TO THE LACK OF MOISTURE DEPTH. SKIES WILL RAPIDLY CLEAR
BEHIND THE FRONT AND TEMPERATURES WILL QUICKLY FALL. THE FORECAST
HAS LOWS FALLING INTO THE 30S FOR MOST OF THE FORECAST AREA...WITH
SOME MID 30S FAR INLAND. THIS IS A DECREASING TREND FROM PREVIOUS
MODEL RUNS...SO THERE IS A VERY LOW CHANCE FOR AN ADVECTIVE FREEZE
IN THESE FAR INLAND AREAS. THE PROBABILITY IS LOW ENOUGH TO NOT
MENTION IN THE HWO...BUT IT IS SOMETHING TO KEEP AN EYE ON.
THURSDAY...HIGH PRESSURE WILL BUILD FROM THE WEST AS THE UPPER
TROUGH SHIFTS OFFSHORE. HOWEVER...A LINGERING CHILLY AIR MASS WILL
KEEP TEMPS WELL BELOW NORMAL IN THE MID TO UPPER 50S WITH
DIMINISHING WINDS THROUGH THE DAY. TEMPS WILL DROP QUICKLY THURSDAY
NIGHT DUE TO RATHER IDEAL RADIATIONAL COOLING CONDITIONS AS HIGH
PRESSURE SLIDES EAST AND BECOMES CENTERED OVER SOUTHEAST NORTH
CAROLINA. BY DAYBREAK FRIDAY TEMPERATURES SHOULD FREEZING OR
SLIGHTLY BELOW FOR MOST AREAS...ESPECIALLY WEST OF HIGHWAY 17 IN
SOUTH CAROLINA CLOSER TO THE CENTER OF THE HIGH. THUS...A FREEZE WATCH
WILL LIKELY BE ISSUED FOR THESE AREAS LATER TODAY.
FRIDAY...TEMPS WILL MODERATE AS HIGH PRESSURE SLIDES INTO THE
ATLANTIC ALLOWING A MILDER SOUTH/SOUTHEAST FLOW TO SET UP. HIGHS
SHOULD REACH THE LOWER TO MID 60S...EXCEPT LIKELY STRUGGLING
TO REACH 60 AT THE COAST DUE TO THE ONSHORE WINDS OFF THE COOLER
ATLANTIC WATERS...STILL BELOW NORMAL FOR THIS TIME OF YEAR. DRY
WEATHER WILL CONTINUE FRIDAY NIGHT ALTHOUGH CLOUDS WILL BE ON THE
INCREASE WHICH WILL KEEP LOW TEMPS CLOSER TO THE MID/UPPER
40S...WARMEST ALONG THE COAST.
SATURDAY...ATLANTIC HIGH PRESSURE WILL BEGIN TO WEAKEN AS A COLD
FRONT APPROACHES FROM THE NORTHWEST. DESPITE INCREASING CLOUDS AND
POSSIBLY A FEW SHOWERS TEMPERATURES SHOULD REACH NEAR 70 DEGREES MOST
LOCALES WITH SOME MID 70S POSSIBLE DEPENDING ON THE AMOUNT OF CLOUD
COVER.
LAKE WINDS...WINDS WILL INCREASE TONIGHT IMMEDIATELY BEHIND THE
FRONT...WITH GUSTS TO AROUND OR JUST ABOVE 30 KTS IN THE EARLY
MORNING HOURS. A LAKE WIND ADVISORY RUNS THROUGH THE NIGHT UNTIL
MIDDAY THURSDAY.
&&
.LONG TERM /SATURDAY NIGHT THROUGH TUESDAY/...
CONDITIONS LOOK UNSETTLED THROUGH EARLY NEXT WEEK AS A COLD
FRONT IS EXPECTED TO PUSH SOUTH INTO SOUTHERN SOUTH CAROLINA SUNDAY
AND THEN EITHER STALL OUT OR CONTINUE TO PUSH SOUTH INTO FLORIDA
SUNDAY NIGHT INTO MONDAY. HIGH PRESSURE SHOULD THEN BUILD IN THROUGH
WEDNESDAY WITH GENERALLY DRY CONDITIONS AND MODERATING TEMPS.
&&
.AVIATION /13Z WEDNESDAY THROUGH SUNDAY/...
THIS MORNING...LOW LEVEL MOISTURE WILL SUPPORT AT LEAST OCCASIONAL
FLIGHT RESTRICTIONS INCLUDING LIFR CEILINGS AND MVFR/IFR VISIBILITY.
ADDITIONAL SHOWERS WILL ALSO PUSH THROUGH THE REGION...ESPECIALLY
THE KCHS AREA.
THIS AFTERNOON...VFR WITH W/SW WINDS GUSTING TO AROUND 30 KT.
LOW PROBABILITY FOR MVFR CEILINGS EARLY. THIS EVENING...COLD FROPA
WILL BRING A WIND SHIFT TO THE WNW ACCOMPANIED BY GUSTS TO AT
LEAST 30 KT...WITH A LOW PROBABILITY FOR MVFR CEILINGS. 06Z OF
LATER...GUSTS SETTLE BACK TO AROUND 25 KT...AND THE PROBABILITY
FOR VFR CONDITIONS IS HIGH.
EXTENDED AVIATION OUTLOOK...VFR THURSDAY THROUGH SATURDAY. MVFR
CEILINGS AND/OR VSBYS LIKELY SATURDAY NIGHT INTO AT LEAST EARLY
MONDAY ALONG WITH SHOWERS DUE TO A COLD FRONT. GUSTY WINDS EXPECTED
INTO THURSDAY AFTERNOON.
&&
.MARINE...
TODAY AND TONIGHT...GUSTY SW WINDS WILL CREATE SCA CONDITIONS
TODAY. THEN...CONDITIONS ACROSS THE LOCAL WATERS WILL QUICKLY
DETERIORATE TONIGHT AS A STRONG COLD FRONT MOVES THROUGH FROM THE
WEST. WINDS WILL INCREASE FURTHER AS THE INITIAL PUNCH OF THE COLD
FRONT THIS EVENING. WINDS WILL TURN MORE W/NW AND FREQUENT GUSTS TO
35 KTS ARE EXPECTED ACROSS ALL NEARSHORE WATERS...AND GUSTS TO 40
KTS FOR THE OUTER WATERS. GALE WARNINGS HAVE BEEN HOISTED FOR ALL
ZONES OUTSIDE OF THE CHARLESTON HARBOR STARTING THIS EVENING AND
RUNNING THROUGH THURSDAY MORNING. THE CHARLESTON HARBOR MAY SEE AN
ISOLATED GUST TO 35 KTS IMMEDIATELY BEHIND THE FRONT...BUT WINDS
OF THIS STRENGTH ARE EXPECTED TO BE TEMPORARY ENOUGH TO NOT GO
WITH A GALE WARNING THERE. THE DAY SHIFT MAY NEED TO REEVALUATE
LATER FOR POSSIBLE UPGRADE. DANGEROUS MARINE CONDITIONS ARE
EXPECTED TONIGHT WITH THE COMBINATION OF THE GALES AND BUILDING
SEAS. SEAS WILL BE AS HIGH AS 6-7 FT RIGHT AROUND 20 NM AND UP TO
9-10 FT BEYOND 20 NM.
THURSDAY THROUGH MONDAY...CONDITIONS WILL IMPROVE DRASTICALLY
THURSDAY AS THE PRESSURE GRADIENT...LOW-LEVEL JET AND COLD ADVECTION
WANE. ALL HEADLINES FOR THE NEARSHORE WATERS SHOULD COME DOWN IN THE
MORNING WITH THE OUTER WATERS FOLLOWING IN THE AFTERNOON. GENERALLY
TRANQUIL CONDITIONS THEN EXPECTED THURSDAY NIGHT THROUGH SATURDAY
BEFORE THINGS LIKELY GO DOWNHILL EARLY NEXT WEEK AS A COLD FRONT
PUSHES INTO THE AREA FROM THE NORTH SUNDAY WITH THE WORST CONDITIONS
LIKELY SUNDAY NIGHT AND/OR MONDAY AS LOW PRESSURE PUSHES OFFSHORE
AND HIGH PRESSURE BUILDS FROM THE NORTH.
&&
.CHS WATCHES/WARNINGS/ADVISORIES...
GA...NONE.
SC...LAKE WIND ADVISORY UNTIL NOON EDT THURSDAY FOR SCZ045.
MARINE...SMALL CRAFT ADVISORY UNTIL 8 PM EDT THIS EVENING FOR AMZ352-
354.
GALE WARNING FROM 8 PM THIS EVENING TO 8 AM EDT THURSDAY FOR
AMZ350-352-354-374.
SMALL CRAFT ADVISORY UNTIL 8 PM EDT THIS EVENING FOR AMZ350-
374.
SMALL CRAFT ADVISORY UNTIL NOON EDT THURSDAY FOR AMZ330.
&&
$$
SYNOPSIS...
NEAR TERM...SPR
SHORT TERM...RJB
LONG TERM...RJB
AVIATION...SPR
MARINE...BSH/RJB/SPR
AREA FORECAST DISCUSSION
NWS CHARLESTON SC
201 AM EDT WED MAR 12 2014
.SYNOPSIS...
AN UPPER DISTURBANCE AND PRE-FRONTAL TROUGH OF LOW PRESSURE WILL
MOVE EAST TOWARD THE SOUTHERN ATLANTIC COAST OVERNIGHT BRINGING
SHOWERS TO MUCH OF SOUTHEAST GEORGIA AND SOUTHERN SOUTH CAROLINA. A
STRONG COLD FRONT WILL THEN MOVE WEDNESDAY NIGHT...FOLLOWED BY
MUCH COOLER HIGH PRESSURE THROUGH FRIDAY. ANOTHER COLD FRONT WILL
MOVE THROUGH OVER THE WEEKEND AND WILL STALL NOT FAR OFFSHORE. A
WAVE OF LOW PRESSURE WILL RIDE ALONG THE FRONT EARLY NEXT
WEEK...AS A HIGH PRESSURE WEDGE DEVELOPS INLAND.
&&
.NEAR TERM /UNTIL 6 AM THIS MORNING/...
THROUGH SUNRISE...WIDESPREAD RAINFALL WILL CONTINUE TO FILL IN
ACROSS THE FORECAST AREA FROM THE SOUTHWEST. THIS AREA OF
PRECIPITATION IS BEING DRIVEN BY A NOTABLE SOUTHERN STREAM
SHORTWAVE THAT IS BEGINNING TO DAMPEN OUT AS IT PUSHES FURTHER
EASTWARD. POPS HAVE BEEN INCREASED SUCH THAT ALL LOCATIONS GET
CATEGORICAL POPS THROUGH SUNRISE. THIS FEATURE IS MOVING FAIRLY
QUICKLY AND THE RAP APPEARS TO HAVE THE BEST BEAT ON ITS TIMING
MOVING FORWARD. THIS WILL BE A RELATIVELY QUICK SHOT OF RAINFALL
AND WILL BE EXITING THE FORECAST AREA NOT TOO LONG AFTER SUNRISE.
TEMPERATURES WILL NOT LIKELY FALL VERY MUCH THROUGH THE REST OF
THE NIGHT...WITH LOWS ONLY BOTTOMING OUT IN THE LOW 60S TO AROUND
60.
&&
.SHORT TERM /6 AM THIS MORNING THROUGH FRIDAY/...
A POTENT UPPER SHORTWAVE WILL SHIFT ACROSS THE OHIO VALLEY AND INTO
THE NORTHEAST UNITED STATES WEDNESDAY AND WEDNESDAY NIGHT. A
SOUTHERN STREAM VORTICITY CENTER WILL MOVE ACROSS THE SOUTHEAST
STATES WEDNESDAY MORNING AND OFF THE COAST BY EARLY AFTERNOON. ANY
LINGERING PRECIPITATION WILL SHIFT OFFSHORE WITH THE SHORTWAVE...
AFTER WHICH THE LOW AND MID LEVEL FLOW VEERS TO WESTERLY. MEANWHILE
A STRONG COLD FRONT ASSOCIATED WITH THE NORTHERN SHORTWAVE WILL PUSH
INTO OUR AREA WEDNESDAY EVENING. AHEAD OF THE FRONT BUT BEHIND THE
SHORTWAVE WE EXPECT PARTIAL CLEARING DURING THE AFTERNOON ALONG WITH
STRONG PRE-FRONTAL COMPRESSION. NUMERICAL GUIDANCE HAS INCREASED A
FEW DEGREES FOR AFTERNOON HIGH TEMPS...ESPECIALLY ACROSS SOUTHEAST
GA WHERE SKIES MAY CLEAR A BIT EARLIER. WE NUDGED HIGH TEMPS UP TO
SHOW 80-83F ACROSS THE SOUTHEASTERN HALF OF THE AREA WITH UPPER 70S
FARTHER INLAND.
A SUBSTANTIAL LOW-LEVEL JET WILL DEVELOP LATE WEDNESDAY MORNING AS
THE UPPER TROUGH AXIS APPROACHES. 850 MB WINDS INCREASE TO 40-50 KT
BETWEEN 18-00Z DEPENDING ON WHICH MODEL YOU ANALYZE. WITH STRONG
WARMING THE MIXED LAYER MAY EXPAND AS HIGH AS 825 MB WHICH WILL TAP
INTO THESE STRONG WINDS ALOFT. THUS A WINDY DAY IS IN STORE FOR MUCH
OF THE AREA. AT THIS POINT WE ARE SHOWING BOTH SUSTAINED WINDS AND
GUSTS REMAINING BELOW WIND ADVISORY CRITERIA BUT LATER SHIFTS MAY
NEED TO CONSIDER AN ADVISORY IN SOME AREAS IF WIND PROGS INCREASE
FURTHER.
CLEARING SKIES AND COLD ADVECTION EXPECTED WEDNESDAY NIGHT WITH LOW
TEMPS DROPPING INTO THE MIDDLE TO UPPER 30S. A FAIRLY STRONG
GRADIENT THROUGH THE NIGHT WILL PRECLUDE FROST ISSUES BUT MAKE FOR
CHILLY CONDITIONS BY DAYBREAK THURSDAY.
THE LOW-LEVEL RIDGE AXIS WILL SHIFT TOWARD THE AREA ON THURSDAY
WHILE COLD ADVECTION PERSISTS. DOWNSLOPE WARMING WILL PUSH TEMPS
UPWARD A TAD BUT HIGH TEMPS WILL ONLY REACH THE UPPER 50S DESPITE
FULL SUNSHINE.
DEEP LAYERED RIDGING THURSDAY NIGHT WILL ALLOW FOR CLEAR SKIES AND A
DECOUPLING BOUNDARY LAYER...YIELDING OPTIMAL RADIATIONAL COOLING
CONDITIONS. A COLD NIGHT IS THUS IN STORE...WITH A FREEZE OCCURRING
MANY AREAS AWAY FROM THE COAST. WE ARE STILL SHOWING UPPER 20S TO
LOWER 30S FOR LOW TEMPS WHICH WILL EVENTUALLY REQUIRE A FREEZE WATCH.
FRIDAY BEGINS A WARM UP AS THE RIDGE AXIS SHIFTS EAST OF THE AREA
AND WARM ADVECTION COMMENCES. HIGH TEMPS WILL PUSH INTO THE 60S WITH
DRY CONDITIONS.
LAKE WINDS...GUSTY WINDS WILL DEVELOP ON LAKE MOULTRIE LATE
WEDNESDAY MORNING AHEAD OF A STRONG COLD FRONT AND WITH A
STRENGTHENING LOW-LEVEL JET. WE ISSUED A LAKE WIND ADVISORY STARTING
AT 10 AM WEDNESDAY. GUSTY WINDS WILL PERSIST THROUGH THURSDAY
MORNING BEFORE QUICKLY IMPROVING.
&&
.LONG TERM /FRIDAY NIGHT THROUGH TUESDAY/...
THE ATLANTIC HIGH LATE IN THE WEEK GIVES WAY TO OUR NEXT COLD FRONT.
THAT FRONT LIMPS THROUGH THE AREA OVER THE WEEKEND AS IT BECOMES
PARALLEL TO THE THE QUASI-ZONAL FLOW UPSTAIRS. ALTHOUGH THERE IS A
DECENT RETURN OF MOISTURE...FORCING REMAINS IN DOUBT SO WE DON/T SEE
TOO MUCH IN THE WAY OF SHOWERS JUST YET. THE FRONT FINALLY SHIFTS
THROUGH AND STALLS OUT OVER THE NEARBY ATLANTIC EARLY NEXT
WEEK...AWAITING FOR THE POTENTIAL FORMATION OF A SURFACE WAVE TO
RIDE NE ALONG THE FRONT AS A HIGH PRESSURE WEDGE DEVELOPS INLAND.
SINCE THERE IS MUCH CONCERN ON EXACTLY HOW THIS EVOLVES WE COULD GO
ANYWHERE FROM SOME SIGNIFICANT RAINFALL TO A DRY FORECAST...WE HAVE
PLAYED A CLIMATOLOGICAL FORECAST OF NO MORE THAN CHANCE POPS.
TEMPS WILL NOT STRAY FAR FROM MID MARCH AVERAGES THROUGH THE
WEEKEND...THEN SHOULD DROP BELOW NORMALS MONDAY AND TUESDAY PROVIDED
THE SCENARIO WE JUST MENTIONED PANS OUT.
&&
.AVIATION /06Z WEDNESDAY THROUGH SUNDAY/...
WIDESPREAD PRECIPITATION CONTINUES TO FILL IN ACROSS THE FORECAST
AREA FROM THE SOUTHWEST AND WILL FIRST IMPACT KSAV FOLLOWED BY
KCHS. LOOKING AT UPSTREAM OBSERVATIONS...MOST SITES ARE NOT SEEING
VISIBILITIES REDUCED BELOW VFR LEVELS WITH THE RAINFALL...THOUGH
THERE ARE SOME CEILING RESTRICTIONS NOTED. IN FACT...GUIDANCE
FEATURES MVFR CEILINGS BEGINNING AROUND 08-09Z AT KSAV AND THAT IS
WHAT I HAVE TIMED INTO THE FORECAST. SIMILAR CONDITIONS ARE
EXPECTED AT KCHS...THOUGH AN HOUR OR TWO LATER. THERE IS STILL A
LOW END POTENTIAL FOR SHORT LIVED IFR CEILINGS...BUT THERE ISN/T
MUCH NOTED IN UPSTREAM OBSERVATIONS SO I HAVE KEPT THE FORECAST
MVFR AT WORST. PRECIPITATION WILL LARGELY WRAP UP IN THE MID/LATE
MORNING HOURS AND THE REST OF THE DAY IS EXPECTED TO BE DRY.
LINGERING MVFR CEILINGS WILL SCATTER OUT AND VFR CONDITIONS ARE IN
PLACE THE REST OF THE PERIOD. WINDS WILL INCREASE STARTING IN THE
MID MORNING AND WILL PEAK WITH WIND GUSTS APPROACHING 30 KTS IN
THE AFTERNOON FROM THE SOUTHWEST. WINDS WILL REMAIN ELEVATED AND
GUSTY THROUGH THE EARLY THURSDAY MORNING HOURS AS THE FRONT PUSHES
THROUGH AND WINDS VEER AROUND TO WESTERLY.
EXTENDED AVIATION OUTLOOK...VFR LATE THURSDAY MORNING THROUGH
SATURDAY. MVFR CEILINGS AND/OR VSBYS POSSIBLE SATURDAY NIGHT AND
SUNDAY WITH A COLD FRONT. GUSTY WINDS EXPECTED WEDNESDAY AFTERNOON
THROUGH THURSDAY MORNING...THEN AGAIN SATURDAY AFTERNOON.
&&
.MARINE...
OVERNIGHT...LOW PRESSURE WILL STRENGTHEN WELL NORTHWEST OF THE
REGION AND THE SURFACE PRESSURE GRADIENT/LOW LEVEL WINDS WILL
INTENSIFY ACCORDINGLY...SUPPORTING INCREASING SOUTHWEST WINDS. AFTER
MIDNIGHT...THE POTENTIAL FOR GUSTS TO 25 KT WILL INCREASE BEYOND
20 NM. ELSEWHERE...WINDS WILL STEADILY INCREASE. EVENING SEAS 1-2
FT WITHIN NEARSHORE WATERS AND 2-3 FT BEYOND 20 NM WILL WILL BUILD
IN RESPONSE TO THE INCREASING WINDS...BECOMING 3-4 FT WITHIN 20 NM
AND 4-5 FT BEYOND.
CANNOT RULE OUT PATCHY SEA FOG WITHIN NEARSHORE WATERS/OUTSIDE
CHARLESTON HARBOR TOWARD DAYBREAK AS LOW-LEVEL MOISTURE INCREASES.
HOWEVER...THE CHANCE FOR SIGNIFICANT SEA FOG IS TOO LOW AT THIS
TIME TO MENTION.
WEDNESDAY WE EXPECT INCREASING SOUTHWESTERLY FLOW AHEAD OF A COLD
FRONT BEFORE WINDS SHIFT TO WNW BEHIND THE FRONT WEDNESDAY NIGHT. A
WARM ADVECTION REGIME ON WEDNESDAY ACROSS COLD ATLANTIC WATERS WILL
NOT SUPPORT GALE CONDITIONS THOUGH WE DO ANTICIPATE SOLID SMALL
CRAFT ADVISORIES ALL WATERS.
BY WEDNESDAY NIGHT THE COLD ADVECTION BEHIND THE COLD FRONT AND
GEOSTROPHIC WINDS INCREASING TO 40-50 KT WILL SUPPORT POSSIBLE GALES
FOR THE SC NEARSHORE AND GA OFFSHORE WATERS SO WE ISSUED A GALE
WATCH FOR THOSE WATERS. ELSEWHERE SOLID SMALL CRAFT CONDITIONS WILL
CONTINUE.
CONDITIONS IMPROVE DRASTICALLY THURSDAY MORNING AS THE UPPER
SHORTWAVE SHIFTS EAST AND THE COLD ADVECTION DIMINISHES.
THURSDAY NIGHT THROUGH SUNDAY...WE ANTICIPATE THE APPROACH OF A WEAK
COLD FRONT LATER SATURDAY THAT STRUGGLES TO MOVE INTO AND THROUGH
THE WATERS SUNDAY...STALLING OVER OR NEAR THE WATERS THROUGH MONDAY.
A HIGH PRESSURE WEDGE WILL FORM INLAND BEHIND THE FRONT...AND
PRESSURE PINCHING WILL TAKE PLACE FOR EARLY NEXT WEEK. SMALL CRAFT
ADVISORIES ARE YET AGAIN POSSIBLE DURING THAT TIME.
&&
.CHS WATCHES/WARNINGS/ADVISORIES...
GA...NONE.
SC...LAKE WIND ADVISORY FROM 10 AM THIS MORNING TO NOON EDT
THURSDAY FOR SCZ045.
MARINE...GALE WATCH FROM THIS EVENING THROUGH THURSDAY MORNING FOR
AMZ350-352-374.
SMALL CRAFT ADVISORY FROM 11 AM THIS MORNING TO 6 PM EDT THIS
EVENING FOR AMZ352.
SMALL CRAFT ADVISORY FROM 8 AM THIS MORNING TO 6 PM EDT THIS
EVENING FOR AMZ350.
SMALL CRAFT ADVISORY FROM NOON TODAY TO NOON EDT THURSDAY FOR
AMZ354.
SMALL CRAFT ADVISORY UNTIL 6 PM EDT THIS EVENING FOR AMZ374.
SMALL CRAFT ADVISORY FROM 11 AM THIS MORNING TO 2 PM EDT
THURSDAY FOR AMZ330.
&&
$$
SYNOPSIS...
NEAR TERM...BSH
SHORT TERM...JRL
LONG TERM...
AVIATION...BSH
MARINE...JRL/SPR
AREA FORECAST DISCUSSION
NWS CHICAGO/ROMEOVILLE IL
256 PM CDT WED MAR 12 2014
.DISCUSSION...
700 AM CDT
HAVE LET THE FEW NORTHERN PARTS OF THE ADVISORY EXPIRE AT 7 AM
WITH NO OTHER CHANGES TO CURRENT HEADLINES. SOME MINOR ADJUSTMENTS
MADE TO THE MORNING FORECAST.
THE PRIMARY UPPER WAVE IS VERY WELL-DEFINED ON SATELLITE AND RADAR
THIS MORNING AND ITS CENTER CONTINUES TO MOVE EAST INTO INDIANA.
THE SYSTEM DEFORMATION CONTINUES TO INTENSIFY WITH THE COLD
CONVEYOR BELT STRENGTHENING INTO THE SYSTEM WITH COPIOUS AMOUNTS OF
MOISTURE CONTINUING TO BE WRAPPED INTO THE BACKSIDE. ALSO
HIGHLIGHTING THIS IS A BLOSSOMING OF REFLECTIVITY ACROSS EAST
CENTRAL ILLINOIS AS OF 700 AM WITH LIKELY SOME 1 IN/HR RATES
TEMPORARILY SEEN WITH THIS AS IT MOVES EAST THROUGH 9 AM.
FROM MONITORING LOCAL MEDIA AND BASED ON A PLETHORA OF
REPORTS...BLOWING SNOW IS OCCURRING IN MANY PLACES DUE TO THE
WINDS. SO CONCERNS ABOUT THE SNOW COMPOSITION POTENTIALLY BEING
TOO WET SEEM TO BE PUT TO REST IN MANY PLACES THANKS TO THE HIGHER
END DEGREE OF GUSTS.
IN ADDITION...THE NORTHERN STREAM SHORT WAVE CONTINUES TO DIG
SOUTH AND HAVE INFLUENCE ON THE MAIN SYSTEM. THIS WAVE IN ITSELF
IS PRODUCING LIGHT PRECIP IN THE FORM OF MAINLY FLURRIES BUT ALSO
SOME FREEZING DRIZZLE. THIS IS ASSOCIATED WITH FOCUSED ASCENT
WITHIN/ABOVE LOW-LEVEL CONVERGENCE. THESE ELEMENTS ON THE RAP DROP
SOUTHWARD INTO NORTHERN ILLINOIS THIS MORNING AND HIGH RES
GUIDANCE SUCH AS THE LOCAL ARW AND THE HOPWRF ENSEMBLE BRING LIGHT
PRECIP SOUTH AS WELL. HAVE INCREASED THE COVERAGE OF FLURRIES IN
THE FORECAST AND ADDED FREEZING DRIZZLE MENTION AS FORECAST PROFILES
REMAIN BORDERLINE FOR EITHER...WHICH LINES UP WITH OBSERVATIONAL
TRENDS. HAVE KEPT THE FREEZING DRIZZLE MENTION WEST OF CHICAGO
FOR THE TIME BEING BASED ON EXTRAPOLATION OF ONGOING REPORTS.
MTF
//PREV DISCUSSION...
350 AM CDT
REST OF TODAY...
THE PRIMARY CHANGES IN THE FORECAST WERE A QUICKER DIMINISHING OF
ANY LIGHT SNOW CHANCES AS WELL AS TO BUMP UP TEMPERATURES NAMELY
THIS MORNING. DEEP DRY AIR AND SUPPRESSION LOOK TO MOVE QUICKLY
INTO THE AREA BY LATE MORNING BEHIND THIS SYSTEM. CONTINUING LOW-
LEVEL CYCLOGENESIS OFF TO THE EAST WILL DRIVE COLD AIR ADVECTION
INTO THE REGION...AND PROFILES WILL BE SUPPORTIVE OF KEEPING
STRATOCU AND MAYBE SOME FLURRIES INTO EARLY TO MID AFTERNOON.
TEMPERATURES ARE FAIRLY HOMOGENEOUS UP TO CENTRAL/SOUTHERN WI
EARLY THIS MORNING...SO LOW-LEVEL THERMAL ADVECTION LOOKS TO BE
NEUTRAL THROUGH DAYBREAK AND THEN SLIGHT COLD AIR ADVECTION THIS
MORNING. TEMPERATURES SHOULD LEVEL OUT THIS AFTERNOON AS AT LEAST
SOME MARCH SUNSHINE OFFSETS ANY COLD AIR ADVECTION. WITH NOT AS
COLD OF AIR QUICKLY COMING INTO THE AREA...THE POSSIBILITY OF LAKE
EFFECT SNOW SHOWERS INTO NORTHWEST INDIANA LOOKS QUITE SMALL...BUT
POSSIBLY SOME CLOUDS GENERATING INTO LAKE AND PORTER COUNTIES THIS
AFTERNOON.
TONIGHT...
HIGH PRESSURE WILL MOVE OVER THE REGION TONIGHT AND SET THE STAGE
FOR A COLD NIGHT BY MID-MARCH STANDARDS. HIGH CLOUDS DO LOOK TO
SPILL INTO THE WESTERN FORECAST AREA AS THE NIGHT PROGRESSES AS A
SHEARED WEAK SHORTWAVE DROPS SOUTHWARD ON THE BACKSIDE OF THE
DEVELOPING LONGWAVE TROUGH. BUT IT LOOKS TO BE A LITTLE TOO LATE
TO STOP TEMPERATURES FROM DROPPING NICELY OVER FRESH SNOW COVER
THIS EVE INTO EARLY OVERNIGHT. FORECAST TEMPERATURES WITH MODEST
CONFIDENCE ARE SINGLE DIGITS IN OUTLYING AREAS TO 10 TO 15 IN THE
CHICAGO METRO. THAT LINES UP WITH THE 850MB TEMPERATURES OF -12C
TO -15C ACROSS THE FORECAST AREA BY TONIGHT...WHICH ARE WELL BELOW
CLIMO. IF CLOUDS WERE TO MOVE IN QUICKER IT WOULD RESULT IN MINS
POTENTIALLY QUITE A BIT WARMER.
THURSDAY AND BEYOND...
WHILE THE UPPER FLOW PATTERN BECOMES NORTHWEST AND REMAINS DECENTLY
ACTIVE THROUGH THE REST OF THE FORECAST PERIOD...WE REMAIN ON THE
ANTICYCLONIC SIDE. THUS WE LOOK TO FREQUENTLY MISS THE BEST
FORCING AND DEEPER SATURATION OF EACH QUICK-MOVING SYSTEM. IT DOES
MAKE FOR A CHALLENGE WITH TEMPERATURES...ESPECIALLY WEIGHING
RECENT SNOW COVER AND OCCASIONALLY PASSING CLOUD COVER. DO
MAINTAIN A SMALL CHANCE FOR LIGHT SNOW THURSDAY MORNING IN
NORTHERN AREAS AS WARM AIR ADVECTION ALOFT MOVES IN BEHIND THE
TROUGH. SATURATION LOOKS TO BE A PROBLEM...BUT THE ISENTROPIC
ASCENT IS PRETTY STRONG AND SATURATION ON BOTH THE NAM AND GFS IS
DEPICTED TO BE LOW ENOUGH FOR SOME LIGHT SNOW TO REACH THE
GROUND...IF IT CAN MATERIALIZE.
FRIDAY LOOKS MILD WITH TEMPERATURES POTENTIALLY PUSHING 50 DEGREES
AS WEST SOUTHWEST LOW-LEVEL FLOW BRING A WARM SECTOR OF ONE OF
THE QUICK-MOVING SYSTEMS INTO OUR AREA.
HAVE GONE WITH AN GFS/EC BLEND FOR THE WEEKEND INTO EARLY NEXT
WEEK. THE GFS IS CONSIDERABLY COLDER FOR SUNDAY AND SUNDAY NIGHT
WITH A STRONG CANADIAN HIGH PASSING OVER THE AREA...WHILE THE EC
FAVORS THIS FEATURE TO BE MUCH FURTHER NORTH AND WEAKER.
MTF
&&
.AVIATION...
//ORD AND MDW CONCERNS...UPDATED 20Z...
* GUSTY NORTH WINDS WITH MAX GUSTS ARND 25 KT BECOMING NNW AFT 00Z.
* SOUTH TO SOUTH-SOUTHEAST WINDS GUSTING TO 15-20 KT TOMORROW
AFTERNOON.
JEE
//DISCUSSION...UPDATED 18Z...
THE LOW IS NOW OVER SOUTHWESTERN PA WITH HIGH PRESSURE OVER
SOUTHERN ONTARIO. THE BAND OF SNOW THAT IMPACTED RFD HAS SHIFTED
SOUTH AND NOT EXPECTING ANY FURTHER PRECIP AT THE TERMINALS.
DID NOT MAKE MANY CHANGES TO THE TAFS AS THE PREVIOUS TAFS SEEM ON
TRACK. STILL NOT 100 PERCENT CERTAIN ON WHEN THE MVFR CIGS WILL
LIFT AS THEY EXTEND UP THROUGH SOUTHERN WI AND CONTINUE TO FILTER
INTO NORTHERN IL AND IN. GUIDANCE CONTINUES TO SUGGEST THEY
DISSIPATE IN THE EARLY AFTN SO KEPT THE 19-21Z TIMING IN THE TAFS.
AS THE LOW CONTINUES OFF TO THE EAST...WINDS WILL BECOME NNW AND
BEGIN TO DIMINISH. A HIGH PRESSURE RIDGE MOVES OVER THE REGION
TONIGHT WITH LIGHT AND VARIABLE WINDS EXPECTED. WINDS WILL BE SSW
BEHIND THE RIDGE TOMORROW MORNING...AND GUST TO 15-20 KT IN THE
AFTERNOON.
JEE
//ORD AND MDW CONFIDENCE...UPDATED 20Z...
* HIGH CONFIDENCE IN ALL FORECAST ELEMENTS.
JEE
//OUTLOOK FOR ORD/MDW FOR 00Z FRIDAY-12Z WEDNESDAY...UPDATED 12Z...
* THURSDAY NIGHT...DRY/VFR.
* FRIDAY...DRY/VFR. GUSTY WESTERLY WINDS.
* SATURDAY THROUGH SUNDAY...DRY/VFR.
* TUESDAY...CHANCE OF RAIN/SNOW. MVFR POSSIBLE.
&&
.MARINE...
210 PM CDT
LOW PRESSURE OVER THE CENTRAL PLAINS WILL CONTINUE TO DEEPEN AS IT
TRACKS EAST ACROSS SOUTHERN ILLINOIS TONIGHT AND INTO THE OHIO
VALLEY WEDNESDAY. AS THE LOW TRACKS SOUTH AND THEN SOUTHEAST OF THE
LAKE...HIGH PRESSURE WILL ALSO BUILD ACROSS THE UPPER GREAT LAKES
REGION...SETTING UP STRONG NORTH WINDS. THE COMBINATION OF A STRONG
GRADIENT AND STRONG COLD ADVECTION WILL LEAD TO WINDS QUICKLY
INCREASING TO GALES BY LATE THIS EVENING. THE LATEST GUIDANCE HAS
BEEN RELATIVELY CONSISTENT IN INDICATING THE POTENTIAL FOR HIGH END
GALES BY LATE WEDNESDAY MORNING AND EARLY AFTERNOON...WITH THE
STRONGEST GALES OVER THE SOUTHERN PORTIONS OF THE LAKE...INCLUDING
THE NEARSHORE WATERS. BY WEDNESDAY EVENING...THE HIGH PRESSURE WILL
BEGIN TO SPREAD ACROSS LAKE MICHIGAN ALLOWING WINDS TO SUBSIDE BELOW
GALE FORCE. BY THURSDAY NIGHT...THE HIGH WILL PUSH TO THE SOUTHEAST
OF THE LAKE AS A CLIPPER DROPS OUT OF NORTHERN ALBERTA AND SWINGS
JUST NORTH OF THE UPPER GREAT LAKES ON FRIDAY. WITH THE SFC HIGH
SAGGING OFF THE SERN COAST...A PERIOD OF SWLY WINDS WILL DEVELOP
AHEAD OF AN APPROACHING COLD FRONT TRAILING FROM THE CLIPPER.
ANTICIPATE A PERIOD OF BRISK SLY TO SWLY WINDS FOR THURSDAY NIGHT
THROUGH FRIDAY...BUT MORE GALES ARE NOT EXPECTED AT THIS TIME. AS
THE CLIPPER TURNS NEWD INTO QUEBEC...IT WILL DRAG A WEAK COLD FRONT
DOWN THE LAKE WITH ANOTHER ARCTIC HIGH BUILDING IN BEHIND THE
FRONT. 25-30KT NORTH WINDS WILL SET UP FOLLOWING THE FROPA FOR
SATURDAY NIGHT AND SUNDAY...BUT AS THE HIGH SPREADS ACROSS THE GREAT
LAKES SUNDAY NIGHT...WINDS SHOULD BECOME MORE LIGHT AND VARIABLE.
KREIN
&&
.LOT WATCHES/WARNINGS/ADVISORIES...
IL...NONE.
IN...NONE.
LM...GALE WARNING...LMZ080-LMZ669-LMZ671-LMZ673-LMZ675-LMZ740-LMZ741-
LMZ742-LMZ743-LMZ744-LMZ745-LMZ777-LMZ779-LMZ870-LMZ872-
LMZ874-LMZ876-LMZ878 UNTIL 10 PM WEDNESDAY.
&&
$$
VISIT US AT HTTP://WEATHER.GOV/CHICAGO (ALL LOWERCASE)
FOLLOW US ON FACEBOOK...TWITTER...AND YOUTUBE AT:
WWW.FACEBOOK.COM/US.NATIONALWEATHERSERVICE.CHICAGO.GOV
WWW.TWITTER.COM/NWSCHICAGO
WWW.YOUTUBE.COM/NWSCHICAGO
AREA FORECAST DISCUSSION
NWS CHICAGO/ROMEOVILLE IL
1248 PM CDT WED MAR 12 2014
.DISCUSSION...
700 AM CDT
HAVE LET THE FEW NORTHERN PARTS OF THE ADVISORY EXPIRE AT 7 AM
WITH NO OTHER CHANGES TO CURRENT HEADLINES. SOME MINOR ADJUSTMENTS
MADE TO THE MORNING FORECAST.
THE PRIMARY UPPER WAVE IS VERY WELL-DEFINED ON SATELLITE AND RADAR
THIS MORNING AND ITS CENTER CONTINUES TO MOVE EAST INTO INDIANA.
THE SYSTEM DEFORMATION CONTINUES TO INTENSIFY WITH THE COLD
CONVEYOR BELT STRENGTHENING INTO THE SYSTEM WITH COPIOUS AMOUNTS OF
MOISTURE CONTINUING TO BE WRAPPED INTO THE BACKSIDE. ALSO
HIGHLIGHTING THIS IS A BLOSSOMING OF REFLECTIVITY ACROSS EAST
CENTRAL ILLINOIS AS OF 700 AM WITH LIKELY SOME 1 IN/HR RATES
TEMPORARILY SEEN WITH THIS AS IT MOVES EAST THROUGH 9 AM.
FROM MONITORING LOCAL MEDIA AND BASED ON A PLETHORA OF
REPORTS...BLOWING SNOW IS OCCURRING IN MANY PLACES DUE TO THE
WINDS. SO CONCERNS ABOUT THE SNOW COMPOSITION POTENTIALLY BEING
TOO WET SEEM TO BE PUT TO REST IN MANY PLACES THANKS TO THE HIGHER
END DEGREE OF GUSTS.
IN ADDITION...THE NORTHERN STREAM SHORT WAVE CONTINUES TO DIG
SOUTH AND HAVE INFLUENCE ON THE MAIN SYSTEM. THIS WAVE IN ITSELF
IS PRODUCING LIGHT PRECIP IN THE FORM OF MAINLY FLURRIES BUT ALSO
SOME FREEZING DRIZZLE. THIS IS ASSOCIATED WITH FOCUSED ASCENT
WITHIN/ABOVE LOW-LEVEL CONVERGENCE. THESE ELEMENTS ON THE RAP DROP
SOUTHWARD INTO NORTHERN ILLINOIS THIS MORNING AND HIGH RES
GUIDANCE SUCH AS THE LOCAL ARW AND THE HOPWRF ENSEMBLE BRING LIGHT
PRECIP SOUTH AS WELL. HAVE INCREASED THE COVERAGE OF FLURRIES IN
THE FORECAST AND ADDED FREEZING DRIZZLE MENTION AS FORECAST PROFILES
REMAIN BORDERLINE FOR EITHER...WHICH LINES UP WITH OBSERVATIONAL
TRENDS. HAVE KEPT THE FREEZING DRIZZLE MENTION WEST OF CHICAGO
FOR THE TIME BEING BASED ON EXTRAPOLATION OF ONGOING REPORTS.
MTF
//PREV DISCUSSION...
350 AM CDT
REST OF TODAY...
THE PRIMARY CHANGES IN THE FORECAST WERE A QUICKER DIMINISHING OF
ANY LIGHT SNOW CHANCES AS WELL AS TO BUMP UP TEMPERATURES NAMELY
THIS MORNING. DEEP DRY AIR AND SUPPRESSION LOOK TO MOVE QUICKLY
INTO THE AREA BY LATE MORNING BEHIND THIS SYSTEM. CONTINUING LOW-
LEVEL CYCLOGENESIS OFF TO THE EAST WILL DRIVE COLD AIR ADVECTION
INTO THE REGION...AND PROFILES WILL BE SUPPORTIVE OF KEEPING
STRATOCU AND MAYBE SOME FLURRIES INTO EARLY TO MID AFTERNOON.
TEMPERATURES ARE FAIRLY HOMOGENEOUS UP TO CENTRAL/SOUTHERN WI
EARLY THIS MORNING...SO LOW-LEVEL THERMAL ADVECTION LOOKS TO BE
NEUTRAL THROUGH DAYBREAK AND THEN SLIGHT COLD AIR ADVECTION THIS
MORNING. TEMPERATURES SHOULD LEVEL OUT THIS AFTERNOON AS AT LEAST
SOME MARCH SUNSHINE OFFSETS ANY COLD AIR ADVECTION. WITH NOT AS
COLD OF AIR QUICKLY COMING INTO THE AREA...THE POSSIBILITY OF LAKE
EFFECT SNOW SHOWERS INTO NORTHWEST INDIANA LOOKS QUITE SMALL...BUT
POSSIBLY SOME CLOUDS GENERATING INTO LAKE AND PORTER COUNTIES THIS
AFTERNOON.
TONIGHT...
HIGH PRESSURE WILL MOVE OVER THE REGION TONIGHT AND SET THE STAGE
FOR A COLD NIGHT BY MID-MARCH STANDARDS. HIGH CLOUDS DO LOOK TO
SPILL INTO THE WESTERN FORECAST AREA AS THE NIGHT PROGRESSES AS A
SHEARED WEAK SHORTWAVE DROPS SOUTHWARD ON THE BACKSIDE OF THE
DEVELOPING LONGWAVE TROUGH. BUT IT LOOKS TO BE A LITTLE TOO LATE
TO STOP TEMPERATURES FROM DROPPING NICELY OVER FRESH SNOW COVER
THIS EVE INTO EARLY OVERNIGHT. FORECAST TEMPERATURES WITH MODEST
CONFIDENCE ARE SINGLE DIGITS IN OUTLYING AREAS TO 10 TO 15 IN THE
CHICAGO METRO. THAT LINES UP WITH THE 850MB TEMPERATURES OF -12C
TO -15C ACROSS THE FORECAST AREA BY TONIGHT...WHICH ARE WELL BELOW
CLIMO. IF CLOUDS WERE TO MOVE IN QUICKER IT WOULD RESULT IN MINS
POTENTIALLY QUITE A BIT WARMER.
THURSDAY AND BEYOND...
WHILE THE UPPER FLOW PATTERN BECOMES NORTHWEST AND REMAINS DECENTLY
ACTIVE THROUGH THE REST OF THE FORECAST PERIOD...WE REMAIN ON THE
ANTICYCLONIC SIDE. THUS WE LOOK TO FREQUENTLY MISS THE BEST
FORCING AND DEEPER SATURATION OF EACH QUICK-MOVING SYSTEM. IT DOES
MAKE FOR A CHALLENGE WITH TEMPERATURES...ESPECIALLY WEIGHING
RECENT SNOW COVER AND OCCASIONALLY PASSING CLOUD COVER. DO
MAINTAIN A SMALL CHANCE FOR LIGHT SNOW THURSDAY MORNING IN
NORTHERN AREAS AS WARM AIR ADVECTION ALOFT MOVES IN BEHIND THE
TROUGH. SATURATION LOOKS TO BE A PROBLEM...BUT THE ISENTROPIC
ASCENT IS PRETTY STRONG AND SATURATION ON BOTH THE NAM AND GFS IS
DEPICTED TO BE LOW ENOUGH FOR SOME LIGHT SNOW TO REACH THE
GROUND...IF IT CAN MATERIALIZE.
FRIDAY LOOKS MILD WITH TEMPERATURES POTENTIALLY PUSHING 50 DEGREES
AS WEST SOUTHWEST LOW-LEVEL FLOW BRING A WARM SECTOR OF ONE OF
THE QUICK-MOVING SYSTEMS INTO OUR AREA.
HAVE GONE WITH AN GFS/EC BLEND FOR THE WEEKEND INTO EARLY NEXT
WEEK. THE GFS IS CONSIDERABLY COLDER FOR SUNDAY AND SUNDAY NIGHT
WITH A STRONG CANADIAN HIGH PASSING OVER THE AREA...WHILE THE EC
FAVORS THIS FEATURE TO BE MUCH FURTHER NORTH AND WEAKER.
MTF
&&
.AVIATION...
//ORD AND MDW CONCERNS...UPDATED 18Z...
* MVFR CIGS INTO EARLY THIS AFTERNOON.
* GUSTY NORTH WINDS WITH MAX GUSTS ARND 30 KT DIMINISHING AND
BECOMING NNW EARLY THIS AFTN. GUSTS ARND 25 KT EXPECTED THIS
AFTN.
* SOUTH TO SOUTH-SOUTHEAST WINDS GUSTING TO 15-20 KT TOMORROW
AFTERNOON.
JEE
//DISCUSSION...UPDATED 18Z...
THE LOW IS NOW OVER SOUTHWESTERN PA WITH HIGH PRESSURE OVER
SOUTHERN ONTARIO. THE BAND OF SNOW THAT IMPACTED RFD HAS SHIFTED
SOUTH AND NOT EXPECTING ANY FURTHER PRECIP AT THE TERMINALS.
DID NOT MAKE MANY CHANGES TO THE TAFS AS THE PREVIOUS TAFS SEEM ON
TRACK. STILL NOT 100 PERCENT CERTAIN ON WHEN THE MVFR CIGS WILL
LIFT AS THEY EXTEND UP THROUGH SOUTHERN WI AND CONTINUE TO FILTER
INTO NORTHERN IL AND IN. GUIDANCE CONTINUES TO SUGGEST THEY
DISSIPATE IN THE EARLY AFTN SO KEPT THE 19-21Z TIMING IN THE TAFS.
AS THE LOW CONTINUES OFF TO THE EAST...WINDS WILL BECOME NNW AND
BEGIN TO DIMINISH. A HIGH PRESSURE RIDGE MOVES OVER THE REGION
TONIGHT WITH LIGHT AND VARIABLE WINDS EXPECTED. WINDS WILL BE SSW
BEHIND THE RIDGE TOMORROW MORNING...AND GUST TO 15-20 KT IN THE
AFTERNOON.
JEE
//ORD AND MDW CONFIDENCE...UPDATED 18Z...
* HIGH CONFIDENCE IN CIG TRENDS...MEDIUM-HIGH CONFIDENCE IN WHEN
MVFR CIGS LIFT TO VFR.
* HIGH CONFIDENCE IN ALL OTHER FORECAST ELEMENTS.
JEE
//OUTLOOK FOR ORD/MDW FOR 00Z FRIDAY-12Z WEDNESDAY...UPDATED 12Z...
* THURSDAY NIGHT...DRY/VFR.
* FRIDAY...DRY/VFR. GUSTY WESTERLY WINDS.
* SATURDAY THROUGH SUNDAY...DRY/VFR.
* TUESDAY...CHANCE OF RAIN/SNOW. MVFR POSSIBLE.
&&
.MARINE...
210 PM CDT
LOW PRESSURE OVER THE CENTRAL PLAINS WILL CONTINUE TO DEEPEN AS IT
TRACKS EAST ACROSS SOUTHERN ILLINOIS TONIGHT AND INTO THE OHIO
VALLEY WEDNESDAY. AS THE LOW TRACKS SOUTH AND THEN SOUTHEAST OF THE
LAKE...HIGH PRESSURE WILL ALSO BUILD ACROSS THE UPPER GREAT LAKES
REGION...SETTING UP STRONG NORTH WINDS. THE COMBINATION OF A STRONG
GRADIENT AND STRONG COLD ADVECTION WILL LEAD TO WINDS QUICKLY
INCREASING TO GALES BY LATE THIS EVENING. THE LATEST GUIDANCE HAS
BEEN RELATIVELY CONSISTENT IN INDICATING THE POTENTIAL FOR HIGH END
GALES BY LATE WEDNESDAY MORNING AND EARLY AFTERNOON...WITH THE
STRONGEST GALES OVER THE SOUTHERN PORTIONS OF THE LAKE...INCLUDING
THE NEARSHORE WATERS. BY WEDNESDAY EVENING...THE HIGH PRESSURE WILL
BEGIN TO SPREAD ACROSS LAKE MICHIGAN ALLOWING WINDS TO SUBSIDE BELOW
GALE FORCE. BY THURSDAY NIGHT...THE HIGH WILL PUSH TO THE SOUTHEAST
OF THE LAKE AS A CLIPPER DROPS OUT OF NORTHERN ALBERTA AND SWINGS
JUST NORTH OF THE UPPER GREAT LAKES ON FRIDAY. WITH THE SFC HIGH
SAGGING OFF THE SERN COAST...A PERIOD OF SWLY WINDS WILL DEVELOP
AHEAD OF AN APPROACHING COLD FRONT TRAILING FROM THE CLIPPER.
ANTICIPATE A PERIOD OF BRISK SLY TO SWLY WINDS FOR THURSDAY NIGHT
THROUGH FRIDAY...BUT MORE GALES ARE NOT EXPECTED AT THIS TIME. AS
THE CLIPPER TURNS NEWD INTO QUEBEC...IT WILL DRAG A WEAK COLD FRONT
DOWN THE LAKE WITH ANOTHER ARCTIC HIGH BUILDING IN BEHIND THE
FRONT. 25-30KT NORTH WINDS WILL SET UP FOLLOWING THE FROPA FOR
SATURDAY NIGHT AND SUNDAY...BUT AS THE HIGH SPREADS ACROSS THE GREAT
LAKES SUNDAY NIGHT...WINDS SHOULD BECOME MORE LIGHT AND VARIABLE.
KREIN
&&
.LOT WATCHES/WARNINGS/ADVISORIES...
IL...NONE.
IN...NONE.
LM...GALE WARNING...LMZ080-LMZ669-LMZ671-LMZ673-LMZ675-LMZ740-LMZ741-
LMZ742-LMZ743-LMZ744-LMZ745-LMZ777-LMZ779-LMZ870-LMZ872-
LMZ874-LMZ876-LMZ878 UNTIL 10 PM WEDNESDAY.
GALE WARNING...LMZ261-LMZ362-LMZ364-LMZ366-LMZ563-LMZ565-LMZ567-
LMZ868 UNTIL 7 PM WEDNESDAY.
&&
$$
VISIT US AT HTTP://WEATHER.GOV/CHICAGO (ALL LOWERCASE)
FOLLOW US ON FACEBOOK...TWITTER...AND YOUTUBE AT:
WWW.FACEBOOK.COM/US.NATIONALWEATHERSERVICE.CHICAGO.GOV
WWW.TWITTER.COM/NWSCHICAGO
WWW.YOUTUBE.COM/NWSCHICAGO
AREA FORECAST DISCUSSION
NWS CHICAGO/ROMEOVILLE IL
1053 AM CDT WED MAR 12 2014
.DISCUSSION...
700 AM CDT
HAVE LET THE FEW NORTHERN PARTS OF THE ADVISORY EXPIRE AT 7 AM
WITH NO OTHER CHANGES TO CURRENT HEADLINES. SOME MINOR ADJUSTMENTS
MADE TO THE MORNING FORECAST.
THE PRIMARY UPPER WAVE IS VERY WELL-DEFINED ON SATELLITE AND RADAR
THIS MORNING AND ITS CENTER CONTINUES TO MOVE EAST INTO INDIANA.
THE SYSTEM DEFORMATION CONTINUES TO INTENSIFY WITH THE COLD
CONVEYOR BELT STRENGTHENING INTO THE SYSTEM WITH COPIOUS AMOUNTS OF
MOISTURE CONTINUING TO BE WRAPPED INTO THE BACKSIDE. ALSO
HIGHLIGHTING THIS IS A BLOSSOMING OF REFLECTIVITY ACROSS EAST
CENTRAL ILLINOIS AS OF 700 AM WITH LIKELY SOME 1 IN/HR RATES
TEMPORARILY SEEN WITH THIS AS IT MOVES EAST THROUGH 9 AM.
FROM MONITORING LOCAL MEDIA AND BASED ON A PLETHORA OF
REPORTS...BLOWING SNOW IS OCCURRING IN MANY PLACES DUE TO THE
WINDS. SO CONCERNS ABOUT THE SNOW COMPOSITION POTENTIALLY BEING
TOO WET SEEM TO BE PUT TO REST IN MANY PLACES THANKS TO THE HIGHER
END DEGREE OF GUSTS.
IN ADDITION...THE NORTHERN STREAM SHORT WAVE CONTINUES TO DIG
SOUTH AND HAVE INFLUENCE ON THE MAIN SYSTEM. THIS WAVE IN ITSELF
IS PRODUCING LIGHT PRECIP IN THE FORM OF MAINLY FLURRIES BUT ALSO
SOME FREEZING DRIZZLE. THIS IS ASSOCIATED WITH FOCUSED ASCENT
WITHIN/ABOVE LOW-LEVEL CONVERGENCE. THESE ELEMENTS ON THE RAP DROP
SOUTHWARD INTO NORTHERN ILLINOIS THIS MORNING AND HIGH RES
GUIDANCE SUCH AS THE LOCAL ARW AND THE HOPWRF ENSEMBLE BRING LIGHT
PRECIP SOUTH AS WELL. HAVE INCREASED THE COVERAGE OF FLURRIES IN
THE FORECAST AND ADDED FREEZING DRIZZLE MENTION AS FORECAST PROFILES
REMAIN BORDERLINE FOR EITHER...WHICH LINES UP WITH OBSERVATIONAL
TRENDS. HAVE KEPT THE FREEZING DRIZZLE MENTION WEST OF CHICAGO
FOR THE TIME BEING BASED ON EXTRAPOLATION OF ONGOING REPORTS.
MTF
//PREV DISCUSSION...
350 AM CDT
REST OF TODAY...
THE PRIMARY CHANGES IN THE FORECAST WERE A QUICKER DIMINISHING OF
ANY LIGHT SNOW CHANCES AS WELL AS TO BUMP UP TEMPERATURES NAMELY
THIS MORNING. DEEP DRY AIR AND SUPPRESSION LOOK TO MOVE QUICKLY
INTO THE AREA BY LATE MORNING BEHIND THIS SYSTEM. CONTINUING LOW-
LEVEL CYCLOGENESIS OFF TO THE EAST WILL DRIVE COLD AIR ADVECTION
INTO THE REGION...AND PROFILES WILL BE SUPPORTIVE OF KEEPING
STRATOCU AND MAYBE SOME FLURRIES INTO EARLY TO MID AFTERNOON.
TEMPERATURES ARE FAIRLY HOMOGENEOUS UP TO CENTRAL/SOUTHERN WI
EARLY THIS MORNING...SO LOW-LEVEL THERMAL ADVECTION LOOKS TO BE
NEUTRAL THROUGH DAYBREAK AND THEN SLIGHT COLD AIR ADVECTION THIS
MORNING. TEMPERATURES SHOULD LEVEL OUT THIS AFTERNOON AS AT LEAST
SOME MARCH SUNSHINE OFFSETS ANY COLD AIR ADVECTION. WITH NOT AS
COLD OF AIR QUICKLY COMING INTO THE AREA...THE POSSIBILITY OF LAKE
EFFECT SNOW SHOWERS INTO NORTHWEST INDIANA LOOKS QUITE SMALL...BUT
POSSIBLY SOME CLOUDS GENERATING INTO LAKE AND PORTER COUNTIES THIS
AFTERNOON.
TONIGHT...
HIGH PRESSURE WILL MOVE OVER THE REGION TONIGHT AND SET THE STAGE
FOR A COLD NIGHT BY MID-MARCH STANDARDS. HIGH CLOUDS DO LOOK TO
SPILL INTO THE WESTERN FORECAST AREA AS THE NIGHT PROGRESSES AS A
SHEARED WEAK SHORTWAVE DROPS SOUTHWARD ON THE BACKSIDE OF THE
DEVELOPING LONGWAVE TROUGH. BUT IT LOOKS TO BE A LITTLE TOO LATE
TO STOP TEMPERATURES FROM DROPPING NICELY OVER FRESH SNOW COVER
THIS EVE INTO EARLY OVERNIGHT. FORECAST TEMPERATURES WITH MODEST
CONFIDENCE ARE SINGLE DIGITS IN OUTLYING AREAS TO 10 TO 15 IN THE
CHICAGO METRO. THAT LINES UP WITH THE 850MB TEMPERATURES OF -12C
TO -15C ACROSS THE FORECAST AREA BY TONIGHT...WHICH ARE WELL BELOW
CLIMO. IF CLOUDS WERE TO MOVE IN QUICKER IT WOULD RESULT IN MINS
POTENTIALLY QUITE A BIT WARMER.
THURSDAY AND BEYOND...
WHILE THE UPPER FLOW PATTERN BECOMES NORTHWEST AND REMAINS DECENTLY
ACTIVE THROUGH THE REST OF THE FORECAST PERIOD...WE REMAIN ON THE
ANTICYCLONIC SIDE. THUS WE LOOK TO FREQUENTLY MISS THE BEST
FORCING AND DEEPER SATURATION OF EACH QUICK-MOVING SYSTEM. IT DOES
MAKE FOR A CHALLENGE WITH TEMPERATURES...ESPECIALLY WEIGHING
RECENT SNOW COVER AND OCCASIONALLY PASSING CLOUD COVER. DO
MAINTAIN A SMALL CHANCE FOR LIGHT SNOW THURSDAY MORNING IN
NORTHERN AREAS AS WARM AIR ADVECTION ALOFT MOVES IN BEHIND THE
TROUGH. SATURATION LOOKS TO BE A PROBLEM...BUT THE ISENTROPIC
ASCENT IS PRETTY STRONG AND SATURATION ON BOTH THE NAM AND GFS IS
DEPICTED TO BE LOW ENOUGH FOR SOME LIGHT SNOW TO REACH THE
GROUND...IF IT CAN MATERIALIZE.
FRIDAY LOOKS MILD WITH TEMPERATURES POTENTIALLY PUSHING 50 DEGREES
AS WEST SOUTHWEST LOW-LEVEL FLOW BRING A WARM SECTOR OF ONE OF
THE QUICK-MOVING SYSTEMS INTO OUR AREA.
HAVE GONE WITH AN GFS/EC BLEND FOR THE WEEKEND INTO EARLY NEXT
WEEK. THE GFS IS CONSIDERABLY COLDER FOR SUNDAY AND SUNDAY NIGHT
WITH A STRONG CANADIAN HIGH PASSING OVER THE AREA...WHILE THE EC
FAVORS THIS FEATURE TO BE MUCH FURTHER NORTH AND WEAKER.
MTF
&&
.AVIATION...
//ORD AND MDW CONCERNS...UPDATED 16Z...
* MVFR CIGS THIS MORNING AND EARLY AFTERNOON.
* GUSTY NORTH WINDS WITH MAX GUSTS ARND 30KT THIS
MORNING...DIMINISHING AND BECOMING NNW EARLY THIS AFTN. GUSTS
ARND 25 KT EXPECTED THIS AFTN.
JEE
//DISCUSSION...UPDATED 12Z...
BACK EDGE OF LIGHT SNOW WILL BE MOVING EAST OF MDW/GYY BY 13Z.
STILL THE POTENTIAL FOR SOME FLURRIES OR VERY LIGHT SNOW THROUGH
MID MORNING BUT NOT EXPECTING ANY VIS/CIGS RESTRICTIONS. BLOWING
SNOW/LOW DRIFTING SNOW WILL CONTINUE INTO THIS AFTERNOON. ONCE
SNOW ENDS...MVFR CIGS WILL CONTINUE INTO THIS AFTERNOON THEN
SCATTER OUT BY EVENING WITH SKC EXPECTED TONIGHT.
STRONG/GUSTY NORTHERLY WINDS WILL CONTINUE THROUGH MUCH OF THE DAY
WITH GUSTS AS HIGH AS 30KTS FOR THE NEXT FEW HOURS...THEN GUSTS
WILL DIMINISH INTO THE MID/UPPER 20KT RANGE BY LATE MORNING...
SLOWLY AND STEADILY DIMINISHING THROUGH AFTERNOON WITH GUSTS
ENDING WITH SUNSET. WINDS WILL BECOME LIGHT AND VARIABLE OVERNIGHT
AS A RIDGE OF HIGH PRESSURE MOVES ACROSS THE AREA. CMS
//ORD AND MDW CONFIDENCE...UPDATED 16Z...
* HIGH CONFIDENCE IN CIG TRENDS...MEDIUM-HIGH CONFIDENCE IN WHEN
MVFR CIGS LIFT TO VFR.
* HIGH CONFIDENCE IN ALL OTHER FORECAST ELEMENTS.
JEE
//OUTLOOK FOR ORD/MDW FOR 00Z FRIDAY-12Z WEDNESDAY...UPDATED 12Z...
* THURSDAY NIGHT...DRY/VFR.
* FRIDAY...DRY/VFR. GUSTY WESTERLY WINDS.
* SATURDAY THROUGH SUNDAY...DRY/VFR.
* TUESDAY...CHANCE OF RAIN/SNOW. MVFR POSSIBLE.
&&
.MARINE...
210 PM CDT
LOW PRESSURE OVER THE CENTRAL PLAINS WILL CONTINUE TO DEEPEN AS IT
TRACKS EAST ACROSS SOUTHERN ILLINOIS TONIGHT AND INTO THE OHIO
VALLEY WEDNESDAY. AS THE LOW TRACKS SOUTH AND THEN SOUTHEAST OF THE
LAKE...HIGH PRESSURE WILL ALSO BUILD ACROSS THE UPPER GREAT LAKES
REGION...SETTING UP STRONG NORTH WINDS. THE COMBINATION OF A STRONG
GRADIENT AND STRONG COLD ADVECTION WILL LEAD TO WINDS QUICKLY
INCREASING TO GALES BY LATE THIS EVENING. THE LATEST GUIDANCE HAS
BEEN RELATIVELY CONSISTENT IN INDICATING THE POTENTIAL FOR HIGH END
GALES BY LATE WEDNESDAY MORNING AND EARLY AFTERNOON...WITH THE
STRONGEST GALES OVER THE SOUTHERN PORTIONS OF THE LAKE...INCLUDING
THE NEARSHORE WATERS. BY WEDNESDAY EVENING...THE HIGH PRESSURE WILL
BEGIN TO SPREAD ACROSS LAKE MICHIGAN ALLOWING WINDS TO SUBSIDE BELOW
GALE FORCE. BY THURSDAY NIGHT...THE HIGH WILL PUSH TO THE SOUTHEAST
OF THE LAKE AS A CLIPPER DROPS OUT OF NORTHERN ALBERTA AND SWINGS
JUST NORTH OF THE UPPER GREAT LAKES ON FRIDAY. WITH THE SFC HIGH
SAGGING OFF THE SERN COAST...A PERIOD OF SWLY WINDS WILL DEVELOP
AHEAD OF AN APPROACHING COLD FRONT TRAILING FROM THE CLIPPER.
ANTICIPATE A PERIOD OF BRISK SLY TO SWLY WINDS FOR THURSDAY NIGHT
THROUGH FRIDAY...BUT MORE GALES ARE NOT EXPECTED AT THIS TIME. AS
THE CLIPPER TURNS NEWD INTO QUEBEC...IT WILL DRAG A WEAK COLD FRONT
DOWN THE LAKE WITH ANOTHER ARCTIC HIGH BUILDING IN BEHIND THE
FRONT. 25-30KT NORTH WINDS WILL SET UP FOLLOWING THE FROPA FOR
SATURDAY NIGHT AND SUNDAY...BUT AS THE HIGH SPREADS ACROSS THE GREAT
LAKES SUNDAY NIGHT...WINDS SHOULD BECOME MORE LIGHT AND VARIABLE.
KREIN
&&
.LOT WATCHES/WARNINGS/ADVISORIES...
IL...NONE.
IN...NONE.
LM...GALE WARNING...LMZ080-LMZ669-LMZ671-LMZ673-LMZ675-LMZ740-LMZ741-
LMZ742-LMZ743-LMZ744-LMZ745-LMZ777-LMZ779-LMZ870-LMZ872-
LMZ874-LMZ876-LMZ878 UNTIL 10 PM WEDNESDAY.
GALE WARNING...LMZ261-LMZ362-LMZ364-LMZ366-LMZ563-LMZ565-LMZ567-
LMZ868 UNTIL 7 PM WEDNESDAY.
&&
$$
VISIT US AT HTTP://WEATHER.GOV/CHICAGO (ALL LOWERCASE)
FOLLOW US ON FACEBOOK...TWITTER...AND YOUTUBE AT:
WWW.FACEBOOK.COM/US.NATIONALWEATHERSERVICE.CHICAGO.GOV
WWW.TWITTER.COM/NWSCHICAGO
WWW.YOUTUBE.COM/NWSCHICAGO
AREA FORECAST DISCUSSION
NWS CHICAGO/ROMEOVILLE IL
920 AM CDT WED MAR 12 2014
.DISCUSSION...
700 AM CDT
HAVE LET THE FEW NORTHERN PARTS OF THE ADVISORY EXPIRE AT 7 AM
WITH NO OTHER CHANGES TO CURRENT HEADLINES. SOME MINOR ADJUSTMENTS
MADE TO THE MORNING FORECAST.
THE PRIMARY UPPER WAVE IS VERY WELL-DEFINED ON SATELLITE AND RADAR
THIS MORNING AND ITS CENTER CONTINUES TO MOVE EAST INTO INDIANA.
THE SYSTEM DEFORMATION CONTINUES TO INTENSIFY WITH THE COLD
CONVEYOR BELT STRENGTHENING INTO THE SYSTEM WITH COPIOUS AMOUNTS OF
MOISTURE CONTINUING TO BE WRAPPED INTO THE BACKSIDE. ALSO
HIGHLIGHTING THIS IS A BLOSSOMING OF REFLECTIVITY ACROSS EAST
CENTRAL ILLINOIS AS OF 700 AM WITH LIKELY SOME 1 IN/HR RATES
TEMPORARILY SEEN WITH THIS AS IT MOVES EAST THROUGH 9 AM.
FROM MONITORING LOCAL MEDIA AND BASED ON A PLETHORA OF
REPORTS...BLOWING SNOW IS OCCURRING IN MANY PLACES DUE TO THE
WINDS. SO CONCERNS ABOUT THE SNOW COMPOSITION POTENTIALLY BEING
TOO WET SEEM TO BE PUT TO REST IN MANY PLACES THANKS TO THE HIGHER
END DEGREE OF GUSTS.
IN ADDITION...THE NORTHERN STREAM SHORT WAVE CONTINUES TO DIG
SOUTH AND HAVE INFLUENCE ON THE MAIN SYSTEM. THIS WAVE IN ITSELF
IS PRODUCING LIGHT PRECIP IN THE FORM OF MAINLY FLURRIES BUT ALSO
SOME FREEZING DRIZZLE. THIS IS ASSOCIATED WITH FOCUSED ASCENT
WITHIN/ABOVE LOW-LEVEL CONVERGENCE. THESE ELEMENTS ON THE RAP DROP
SOUTHWARD INTO NORTHERN ILLINOIS THIS MORNING AND HIGH RES
GUIDANCE SUCH AS THE LOCAL ARW AND THE HOPWRF ENSEMBLE BRING LIGHT
PRECIP SOUTH AS WELL. HAVE INCREASED THE COVERAGE OF FLURRIES IN
THE FORECAST AND ADDED FREEZING DRIZZLE MENTION AS FORECAST PROFILES
REMAIN BORDERLINE FOR EITHER...WHICH LINES UP WITH OBSERVATIONAL
TRENDS. HAVE KEPT THE FREEZING DRIZZLE MENTION WEST OF CHICAGO
FOR THE TIME BEING BASED ON EXTRAPOLATION OF ONGOING REPORTS.
MTF
//PREV DISCUSSION...
350 AM CDT
REST OF TODAY...
THE PRIMARY CHANGES IN THE FORECAST WERE A QUICKER DIMINISHING OF
ANY LIGHT SNOW CHANCES AS WELL AS TO BUMP UP TEMPERATURES NAMELY
THIS MORNING. DEEP DRY AIR AND SUPPRESSION LOOK TO MOVE QUICKLY
INTO THE AREA BY LATE MORNING BEHIND THIS SYSTEM. CONTINUING LOW-
LEVEL CYCLOGENESIS OFF TO THE EAST WILL DRIVE COLD AIR ADVECTION
INTO THE REGION...AND PROFILES WILL BE SUPPORTIVE OF KEEPING
STRATOCU AND MAYBE SOME FLURRIES INTO EARLY TO MID AFTERNOON.
TEMPERATURES ARE FAIRLY HOMOGENEOUS UP TO CENTRAL/SOUTHERN WI
EARLY THIS MORNING...SO LOW-LEVEL THERMAL ADVECTION LOOKS TO BE
NEUTRAL THROUGH DAYBREAK AND THEN SLIGHT COLD AIR ADVECTION THIS
MORNING. TEMPERATURES SHOULD LEVEL OUT THIS AFTERNOON AS AT LEAST
SOME MARCH SUNSHINE OFFSETS ANY COLD AIR ADVECTION. WITH NOT AS
COLD OF AIR QUICKLY COMING INTO THE AREA...THE POSSIBILITY OF LAKE
EFFECT SNOW SHOWERS INTO NORTHWEST INDIANA LOOKS QUITE SMALL...BUT
POSSIBLY SOME CLOUDS GENERATING INTO LAKE AND PORTER COUNTIES THIS
AFTERNOON.
TONIGHT...
HIGH PRESSURE WILL MOVE OVER THE REGION TONIGHT AND SET THE STAGE
FOR A COLD NIGHT BY MID-MARCH STANDARDS. HIGH CLOUDS DO LOOK TO
SPILL INTO THE WESTERN FORECAST AREA AS THE NIGHT PROGRESSES AS A
SHEARED WEAK SHORTWAVE DROPS SOUTHWARD ON THE BACKSIDE OF THE
DEVELOPING LONGWAVE TROUGH. BUT IT LOOKS TO BE A LITTLE TOO LATE
TO STOP TEMPERATURES FROM DROPPING NICELY OVER FRESH SNOW COVER
THIS EVE INTO EARLY OVERNIGHT. FORECAST TEMPERATURES WITH MODEST
CONFIDENCE ARE SINGLE DIGITS IN OUTLYING AREAS TO 10 TO 15 IN THE
CHICAGO METRO. THAT LINES UP WITH THE 850MB TEMPERATURES OF -12C
TO -15C ACROSS THE FORECAST AREA BY TONIGHT...WHICH ARE WELL BELOW
CLIMO. IF CLOUDS WERE TO MOVE IN QUICKER IT WOULD RESULT IN MINS
POTENTIALLY QUITE A BIT WARMER.
THURSDAY AND BEYOND...
WHILE THE UPPER FLOW PATTERN BECOMES NORTHWEST AND REMAINS DECENTLY
ACTIVE THROUGH THE REST OF THE FORECAST PERIOD...WE REMAIN ON THE
ANTICYCLONIC SIDE. THUS WE LOOK TO FREQUENTLY MISS THE BEST
FORCING AND DEEPER SATURATION OF EACH QUICK-MOVING SYSTEM. IT DOES
MAKE FOR A CHALLENGE WITH TEMPERATURES...ESPECIALLY WEIGHING
RECENT SNOW COVER AND OCCASIONALLY PASSING CLOUD COVER. DO
MAINTAIN A SMALL CHANCE FOR LIGHT SNOW THURSDAY MORNING IN
NORTHERN AREAS AS WARM AIR ADVECTION ALOFT MOVES IN BEHIND THE
TROUGH. SATURATION LOOKS TO BE A PROBLEM...BUT THE ISENTROPIC
ASCENT IS PRETTY STRONG AND SATURATION ON BOTH THE NAM AND GFS IS
DEPICTED TO BE LOW ENOUGH FOR SOME LIGHT SNOW TO REACH THE
GROUND...IF IT CAN MATERIALIZE.
FRIDAY LOOKS MILD WITH TEMPERATURES POTENTIALLY PUSHING 50 DEGREES
AS WEST SOUTHWEST LOW-LEVEL FLOW BRING A WARM SECTOR OF ONE OF
THE QUICK-MOVING SYSTEMS INTO OUR AREA.
HAVE GONE WITH AN GFS/EC BLEND FOR THE WEEKEND INTO EARLY NEXT
WEEK. THE GFS IS CONSIDERABLY COLDER FOR SUNDAY AND SUNDAY NIGHT
WITH A STRONG CANADIAN HIGH PASSING OVER THE AREA...WHILE THE EC
FAVORS THIS FEATURE TO BE MUCH FURTHER NORTH AND WEAKER.
MTF
&&
.AVIATION...
//ORD AND MDW CONCERNS...UPDATED 14Z...
* MVFR CIGS THIS MORNING AND EARLY AFTERNOON.
* GUSTY NORTH WINDS WITH MAX GUSTS ARND 30KT THIS
MORNING...DIMINISHING AND BECOMING NNW EARLY THIS AFTN. GUSTS
ARND 25 KT EXPECTED THIS AFTN.
JEE
//DISCUSSION...UPDATED 12Z...
BACK EDGE OF LIGHT SNOW WILL BE MOVING EAST OF MDW/GYY BY 13Z.
STILL THE POTENTIAL FOR SOME FLURRIES OR VERY LIGHT SNOW THROUGH
MID MORNING BUT NOT EXPECTING ANY VIS/CIGS RESTRICTIONS. BLOWING
SNOW/LOW DRIFTING SNOW WILL CONTINUE INTO THIS AFTERNOON. ONCE
SNOW ENDS...MVFR CIGS WILL CONTINUE INTO THIS AFTERNOON THEN
SCATTER OUT BY EVENING WITH SKC EXPECTED TONIGHT.
STRONG/GUSTY NORTHERLY WINDS WILL CONTINUE THROUGH MUCH OF THE DAY
WITH GUSTS AS HIGH AS 30KTS FOR THE NEXT FEW HOURS...THEN GUSTS
WILL DIMINISH INTO THE MID/UPPER 20KT RANGE BY LATE MORNING...
SLOWLY AND STEADILY DIMINISHING THROUGH AFTERNOON WITH GUSTS
ENDING WITH SUNSET. WINDS WILL BECOME LIGHT AND VARIABLE OVERNIGHT
AS A RIDGE OF HIGH PRESSURE MOVES ACROSS THE AREA. CMS
//ORD AND MDW CONFIDENCE...UPDATED 14Z...
* HIGH CONFIDENCE IN CIG TRENDS...MEDIUM-HIGH CONFIDENCE IN WHEN
MVFR CIGS LIFT TO VFR.
* HIGH CONFIDENCE IN ALL OTHER FORECAST ELEMENTS.
JEE
//OUTLOOK FOR ORD/MDW FOR 00Z FRIDAY-12Z WEDNESDAY...UPDATED 12Z...
* THURSDAY NIGHT...DRY/VFR.
* FRIDAY...DRY/VFR. GUSTY WESTERLY WINDS.
* SATURDAY THROUGH SUNDAY...DRY/VFR.
* TUESDAY...CHANCE OF RAIN/SNOW. MVFR POSSIBLE.
&&
.MARINE...
210 PM CDT
LOW PRESSURE OVER THE CENTRAL PLAINS WILL CONTINUE TO DEEPEN AS IT
TRACKS EAST ACROSS SOUTHERN ILLINOIS TONIGHT AND INTO THE OHIO
VALLEY WEDNESDAY. AS THE LOW TRACKS SOUTH AND THEN SOUTHEAST OF THE
LAKE...HIGH PRESSURE WILL ALSO BUILD ACROSS THE UPPER GREAT LAKES
REGION...SETTING UP STRONG NORTH WINDS. THE COMBINATION OF A STRONG
GRADIENT AND STRONG COLD ADVECTION WILL LEAD TO WINDS QUICKLY
INCREASING TO GALES BY LATE THIS EVENING. THE LATEST GUIDANCE HAS
BEEN RELATIVELY CONSISTENT IN INDICATING THE POTENTIAL FOR HIGH END
GALES BY LATE WEDNESDAY MORNING AND EARLY AFTERNOON...WITH THE
STRONGEST GALES OVER THE SOUTHERN PORTIONS OF THE LAKE...INCLUDING
THE NEARSHORE WATERS. BY WEDNESDAY EVENING...THE HIGH PRESSURE WILL
BEGIN TO SPREAD ACROSS LAKE MICHIGAN ALLOWING WINDS TO SUBSIDE BELOW
GALE FORCE. BY THURSDAY NIGHT...THE HIGH WILL PUSH TO THE SOUTHEAST
OF THE LAKE AS A CLIPPER DROPS OUT OF NORTHERN ALBERTA AND SWINGS
JUST NORTH OF THE UPPER GREAT LAKES ON FRIDAY. WITH THE SFC HIGH
SAGGING OFF THE SERN COAST...A PERIOD OF SWLY WINDS WILL DEVELOP
AHEAD OF AN APPROACHING COLD FRONT TRAILING FROM THE CLIPPER.
ANTICIPATE A PERIOD OF BRISK SLY TO SWLY WINDS FOR THURSDAY NIGHT
THROUGH FRIDAY...BUT MORE GALES ARE NOT EXPECTED AT THIS TIME. AS
THE CLIPPER TURNS NEWD INTO QUEBEC...IT WILL DRAG A WEAK COLD FRONT
DOWN THE LAKE WITH ANOTHER ARCTIC HIGH BUILDING IN BEHIND THE
FRONT. 25-30KT NORTH WINDS WILL SET UP FOLLOWING THE FROPA FOR
SATURDAY NIGHT AND SUNDAY...BUT AS THE HIGH SPREADS ACROSS THE GREAT
LAKES SUNDAY NIGHT...WINDS SHOULD BECOME MORE LIGHT AND VARIABLE.
KREIN
&&
.LOT WATCHES/WARNINGS/ADVISORIES...
IL...WINTER STORM WARNING...ILZ013-ILZ014-ILZ020-ILZ021-ILZ022-ILZ023
UNTIL 11 AM WEDNESDAY.
WINTER WEATHER ADVISORY...ILZ019-ILZ032-ILZ033-ILZ039 UNTIL 11
AM WEDNESDAY.
IN...WINTER STORM WARNING...INZ001-INZ002 UNTIL 11 AM WEDNESDAY.
WINTER WEATHER ADVISORY...INZ010-INZ011-INZ019 UNTIL 11 AM
WEDNESDAY.
LM...GALE WARNING...LMZ080-LMZ669-LMZ671-LMZ673-LMZ675-LMZ740-LMZ741-
LMZ742-LMZ743-LMZ744-LMZ745-LMZ777-LMZ779-LMZ870-LMZ872-
LMZ874-LMZ876-LMZ878 UNTIL 10 PM WEDNESDAY.
GALE WARNING...LMZ261-LMZ362-LMZ364-LMZ366-LMZ563-LMZ565-LMZ567-
LMZ868 UNTIL 7 PM WEDNESDAY.
&&
$$
VISIT US AT HTTP://WEATHER.GOV/CHICAGO (ALL LOWERCASE)
FOLLOW US ON FACEBOOK...TWITTER...AND YOUTUBE AT:
WWW.FACEBOOK.COM/US.NATIONALWEATHERSERVICE.CHICAGO.GOV
WWW.TWITTER.COM/NWSCHICAGO
WWW.YOUTUBE.COM/NWSCHICAGO
AREA FORECAST DISCUSSION...UPDATED
NWS CHICAGO/ROMEOVILLE IL
706 AM CDT WED MAR 12 2014
.DISCUSSION...
700 AM CDT
HAVE LET THE FEW NORTHERN PARTS OF THE ADVISORY EXPIRE AT 7 AM
WITH NO OTHER CHANGES TO CURRENT HEADLINES. SOME MINOR ADJUSTMENTS
MADE TO THE MORNING FORECAST.
THE PRIMARY UPPER WAVE IS VERY WELL-DEFINED ON SATELLITE AND RADAR
THIS MORNING AND ITS CENTER CONTINUES TO MOVE EAST INTO INDIANA.
THE SYSTEM DEFORMATION CONTINUES TO INTENSIFY WITH THE COLD
CONVEYOR BELT STRENGTHENING INTO THE SYSTEM WITH COPIOUS AMOUNTS OF
MOISTURE CONTINUING TO BE WRAPPED INTO THE BACKSIDE. ALSO
HIGHLIGHTING THIS IS A BLOSSOMING OF REFLECTIVITY ACROSS EAST
CENTRAL ILLINOIS AS OF 700 AM WITH LIKELY SOME 1 IN/HR RATES
TEMPORARILY SEEN WITH THIS AS IT MOVES EAST THROUGH 9 AM.
FROM MONITORING LOCAL MEDIA AND BASED ON A PLETHORA OF
REPORTS...BLOWING SNOW IS OCCURRING IN MANY PLACES DUE TO THE
WINDS. SO CONCERNS ABOUT THE SNOW COMPOSITION POTENTIALLY BEING
TOO WET SEEM TO BE PUT TO REST IN MANY PLACES THANKS TO THE HIGHER
END DEGREE OF GUSTS.
IN ADDITION...THE NORTHERN STREAM SHORT WAVE CONTINUES TO DIG
SOUTH AND HAVE INFLUENCE ON THE MAIN SYSTEM. THIS WAVE IN ITSELF
IS PRODUCING LIGHT PRECIP IN THE FORM OF MAINLY FLURRIES BUT ALSO
SOME FREEZING DRIZZLE. THIS IS ASSOCIATED WITH FOCUSED ASCENT
WITHIN/ABOVE LOW-LEVEL CONVERGENCE. THESE ELEMENTS ON THE RAP DROP
SOUTHWARD INTO NORTHERN ILLINOIS THIS MORNING AND HIGH RES
GUIDANCE SUCH AS THE LOCAL ARW AND THE HOPWRF ENSEMBLE BRING LIGHT
PRECIP SOUTH AS WELL. HAVE INCREASED THE COVERAGE OF FLURRIES IN
THE FORECAST AND ADDED FREEZING DRIZZLE MENTION AS FORECAST PROFILES
REMAIN BORDERLINE FOR EITHER...WHICH LINES UP WITH OBSERVATIONAL
TRENDS. HAVE KEPT THE FREEZING DRIZZLE MENTION WEST OF CHICAGO
FOR THE TIME BEING BASED ON EXTRAPOLATION OF ONGOING REPORTS.
MTF
&&
.PREV DISCUSSION...
350 AM CDT
REST OF TODAY...
THE PRIMARY CHANGES IN THE FORECAST WERE A QUICKER DIMINISHING OF
ANY LIGHT SNOW CHANCES AS WELL AS TO BUMP UP TEMPERATURES NAMELY
THIS MORNING. DEEP DRY AIR AND SUPPRESSION LOOK TO MOVE QUICKLY
INTO THE AREA BY LATE MORNING BEHIND THIS SYSTEM. CONTINUING LOW-
LEVEL CYCLOGENESIS OFF TO THE EAST WILL DRIVE COLD AIR ADVECTION
INTO THE REGION...AND PROFILES WILL BE SUPPORTIVE OF KEEPING
STRATOCU AND MAYBE SOME FLURRIES INTO EARLY TO MID AFTERNOON.
TEMPERATURES ARE FAIRLY HOMOGENEOUS UP TO CENTRAL/SOUTHERN WI
EARLY THIS MORNING...SO LOW-LEVEL THERMAL ADVECTION LOOKS TO BE
NEUTRAL THROUGH DAYBREAK AND THEN SLIGHT COLD AIR ADVECTION THIS
MORNING. TEMPERATURES SHOULD LEVEL OUT THIS AFTERNOON AS AT LEAST
SOME MARCH SUNSHINE OFFSETS ANY COLD AIR ADVECTION. WITH NOT AS
COLD OF AIR QUICKLY COMING INTO THE AREA...THE POSSIBILITY OF LAKE
EFFECT SNOW SHOWERS INTO NORTHWEST INDIANA LOOKS QUITE SMALL...BUT
POSSIBLY SOME CLOUDS GENERATING INTO LAKE AND PORTER COUNTIES THIS
AFTERNOON.
TONIGHT...
HIGH PRESSURE WILL MOVE OVER THE REGION TONIGHT AND SET THE STAGE
FOR A COLD NIGHT BY MID-MARCH STANDARDS. HIGH CLOUDS DO LOOK TO
SPILL INTO THE WESTERN FORECAST AREA AS THE NIGHT PROGRESSES AS A
SHEARED WEAK SHORTWAVE DROPS SOUTHWARD ON THE BACKSIDE OF THE
DEVELOPING LONGWAVE TROUGH. BUT IT LOOKS TO BE A LITTLE TOO LATE
TO STOP TEMPERATURES FROM DROPPING NICELY OVER FRESH SNOW COVER
THIS EVE INTO EARLY OVERNIGHT. FORECAST TEMPERATURES WITH MODEST
CONFIDENCE ARE SINGLE DIGITS IN OUTLYING AREAS TO 10 TO 15 IN THE
CHICAGO METRO. THAT LINES UP WITH THE 850MB TEMPERATURES OF -12C
TO -15C ACROSS THE FORECAST AREA BY TONIGHT...WHICH ARE WELL BELOW
CLIMO. IF CLOUDS WERE TO MOVE IN QUICKER IT WOULD RESULT IN MINS
POTENTIALLY QUITE A BIT WARMER.
THURSDAY AND BEYOND...
WHILE THE UPPER FLOW PATTERN BECOMES NORTHWEST AND REMAINS DECENTLY
ACTIVE THROUGH THE REST OF THE FORECAST PERIOD...WE REMAIN ON THE
ANTICYCLONIC SIDE. THUS WE LOOK TO FREQUENTLY MISS THE BEST
FORCING AND DEEPER SATURATION OF EACH QUICK-MOVING SYSTEM. IT DOES
MAKE FOR A CHALLENGE WITH TEMPERATURES...ESPECIALLY WEIGHING
RECENT SNOW COVER AND OCCASIONALLY PASSING CLOUD COVER. DO
MAINTAIN A SMALL CHANCE FOR LIGHT SNOW THURSDAY MORNING IN
NORTHERN AREAS AS WARM AIR ADVECTION ALOFT MOVES IN BEHIND THE
TROUGH. SATURATION LOOKS TO BE A PROBLEM...BUT THE ISENTROPIC
ASCENT IS PRETTY STRONG AND SATURATION ON BOTH THE NAM AND GFS IS
DEPICTED TO BE LOW ENOUGH FOR SOME LIGHT SNOW TO REACH THE
GROUND...IF IT CAN MATERIALIZE.
FRIDAY LOOKS MILD WITH TEMPERATURES POTENTIALLY PUSHING 50 DEGREES
AS WEST SOUTHWEST LOW-LEVEL FLOW BRING A WARM SECTOR OF ONE OF
THE QUICK-MOVING SYSTEMS INTO OUR AREA.
HAVE GONE WITH AN GFS/EC BLEND FOR THE WEEKEND INTO EARLY NEXT
WEEK. THE GFS IS CONSIDERABLY COLDER FOR SUNDAY AND SUNDAY NIGHT
WITH A STRONG CANADIAN HIGH PASSING OVER THE AREA...WHILE THE EC
FAVORS THIS FEATURE TO BE MUCH FURTHER NORTH AND WEAKER.
MTF
&&
.AVIATION...
//ORD AND MDW CONCERNS...UPDATED 12Z...
* LIGHT SNOW ENDING BY 13Z.
* BLOWING SNOW THIS MORNING.
* MVFR CIGS THROUGH THIS AFTERNOON.
* STRONG/GUSTY NORTHERLY WINDS THROUGH MID/LATE AFTERNOON. CMS
//DISCUSSION...UPDATED 12Z...
BACK EDGE OF LIGHT SNOW WILL BE MOVING EAST OF MDW/GYY BY 13Z.
STILL THE POTENTIAL FOR SOME FLURRIES OR VERY LIGHT SNOW THROUGH
MID MORNING BUT NOT EXPECTING ANY VIS/CIGS RESTRICTIONS. BLOWING
SNOW/LOW DRIFTING SNOW WILL CONTINUE INTO THIS AFTERNOON. ONCE
SNOW ENDS...MVFR CIGS WILL CONTINUE INTO THIS AFTERNOON THEN
SCATTER OUT BY EVENING WITH SKC EXPECTED TONIGHT.
STRONG/GUSTY NORTHERLY WINDS WILL CONTINUE THROUGH MUCH OF THE DAY
WITH GUSTS AS HIGH AS 30KTS FOR THE NEXT FEW HOURS...THEN GUSTS
WILL DIMINISH INTO THE MID/UPPER 20KT RANGE BY LATE MORNING...
SLOWLY AND STEADILY DIMINISHING THROUGH AFTERNOON WITH GUSTS
ENDING WITH SUNSET. WINDS WILL BECOME LIGHT AND VARIABLE OVERNIGHT
AS A RIDGE OF HIGH PRESSURE MOVES ACROSS THE AREA. CMS
//ORD AND MDW CONFIDENCE...UPDATED 12Z...
* HIGH FOR SNOW END TIMING.
* HIGH FOR CIG TRENDS.
* HIGH FOR WINDS SPEEDS/GUSTS/DIRECTIONS. CMS
//OUTLOOK FOR ORD/MDW FOR 00Z FRIDAY-12Z WEDNESDAY...UPDATED 12Z...
* THURSDAY NIGHT...DRY/VFR.
* FRIDAY...DRY/VFR. GUSTY WESTERLY WINDS.
* SATURDAY THROUGH SUNDAY...DRY/VFR.
* TUESDAY...CHANCE OF RAIN/SNOW. MVFR POSSIBLE.
&&
.MARINE...
210 PM CDT
LOW PRESSURE OVER THE CENTRAL PLAINS WILL CONTINUE TO DEEPEN AS IT
TRACKS EAST ACROSS SOUTHERN ILLINOIS TONIGHT AND INTO THE OHIO
VALLEY WEDNESDAY. AS THE LOW TRACKS SOUTH AND THEN SOUTHEAST OF THE
LAKE...HIGH PRESSURE WILL ALSO BUILD ACROSS THE UPPER GREAT LAKES
REGION...SETTING UP STRONG NORTH WINDS. THE COMBINATION OF A STRONG
GRADIENT AND STRONG COLD ADVECTION WILL LEAD TO WINDS QUICKLY
INCREASING TO GALES BY LATE THIS EVENING. THE LATEST GUIDANCE HAS
BEEN RELATIVELY CONSISTENT IN INDICATING THE POTENTIAL FOR HIGH END
GALES BY LATE WEDNESDAY MORNING AND EARLY AFTERNOON...WITH THE
STRONGEST GALES OVER THE SOUTHERN PORTIONS OF THE LAKE...INCLUDING
THE NEARSHORE WATERS. BY WEDNESDAY EVENING...THE HIGH PRESSURE WILL
BEGIN TO SPREAD ACROSS LAKE MICHIGAN ALLOWING WINDS TO SUBSIDE BELOW
GALE FORCE. BY THURSDAY NIGHT...THE HIGH WILL PUSH TO THE SOUTHEAST
OF THE LAKE AS A CLIPPER DROPS OUT OF NORTHERN ALBERTA AND SWINGS
JUST NORTH OF THE UPPER GREAT LAKES ON FRIDAY. WITH THE SFC HIGH
SAGGING OFF THE SERN COAST...A PERIOD OF SWLY WINDS WILL DEVELOP
AHEAD OF AN APPROACHING COLD FRONT TRAILING FROM THE CLIPPER.
ANTICIPATE A PERIOD OF BRISK SLY TO SWLY WINDS FOR THURSDAY NIGHT
THROUGH FRIDAY...BUT MORE GALES ARE NOT EXPECTED AT THIS TIME. AS
THE CLIPPER TURNS NEWD INTO QUEBEC...IT WILL DRAG A WEAK COLD FRONT
DOWN THE LAKE WITH ANOTHER ARCTIC HIGH BUILDING IN BEHIND THE
FRONT. 25-30KT NORTH WINDS WILL SET UP FOLLOWING THE FROPA FOR
SATURDAY NIGHT AND SUNDAY...BUT AS THE HIGH SPREADS ACROSS THE GREAT
LAKES SUNDAY NIGHT...WINDS SHOULD BECOME MORE LIGHT AND VARIABLE.
KREIN
&&
.LOT WATCHES/WARNINGS/ADVISORIES...
IL...WINTER STORM WARNING...ILZ013-ILZ014-ILZ020-ILZ021-ILZ022-ILZ023
UNTIL 11 AM WEDNESDAY.
WINTER WEATHER ADVISORY...ILZ006-ILZ011-ILZ012 UNTIL 7 AM
WEDNESDAY.
WINTER WEATHER ADVISORY...ILZ019-ILZ032-ILZ033-ILZ039 UNTIL 11
AM WEDNESDAY.
IN...WINTER STORM WARNING...INZ001-INZ002 UNTIL 11 AM WEDNESDAY.
WINTER WEATHER ADVISORY...INZ010-INZ011-INZ019 UNTIL 11 AM
WEDNESDAY.
LM...GALE WARNING...LMZ080-LMZ669-LMZ671-LMZ673-LMZ675-LMZ740-LMZ741-
LMZ742-LMZ743-LMZ744-LMZ745-LMZ777-LMZ779-LMZ870-LMZ872-
LMZ874-LMZ876-LMZ878 UNTIL 10 PM WEDNESDAY.
GALE WARNING...LMZ261-LMZ362-LMZ364-LMZ366-LMZ563-LMZ565-LMZ567-
LMZ868 UNTIL 7 PM WEDNESDAY.
&&
$$
VISIT US AT HTTP://WEATHER.GOV/CHICAGO (ALL LOWERCASE)
FOLLOW US ON FACEBOOK...TWITTER...AND YOUTUBE AT:
WWW.FACEBOOK.COM/US.NATIONALWEATHERSERVICE.CHICAGO.GOV
WWW.TWITTER.COM/NWSCHICAGO
WWW.YOUTUBE.COM/NWSCHICAGO
AREA FORECAST DISCUSSION
NWS CHICAGO/ROMEOVILLE IL
645 AM CDT WED MAR 12 2014
.DISCUSSION...
350 AM CDT
HAVE MADE SOME ADJUSTMENTS TO HEADLINES...NAMELY TO BRING UP
EXPIRATION TIMES...INCLUDING WARNING FOR THE CHICAGO AREA. ALSO
DID DOWNGRADE THE WARNING IN A HANDFUL OF COUNTIES THAT EITHER 1.
RECEIVED CONSIDERABLY LESS SNOWFALL THAN ORIGINALLY FORECAST OR 2.
WILL HAVE AN EARLIER END TIME WITH LESS BLOWING SNOW THAN INITIALLY
THOUGHT AND THUS IMPACTS AFTER SUNRISE WILL BE CONSIDERABLY
LESS...SO DID NOT FEEL WARNING WAS ANY LONGER APPROPRIATE FOR
THOSE AREAS.
THE VERY WELL-DEFINED UPPER LOW IS ENTERING WESTERN IL AS OF 330
AM WITH FURTHER AMPLIFICATION OCCURRING AS NORTHERN STREAM SHORT
WAVE FROM MN DIGS SOUTHEAST TOWARD/INTO THIS SYSTEM. THE
DEFORMATION AREA SEEMS TO BE FOLLOWING SUIT...WITH INCREASED
REFLECTIVITY SINCE 300 AM IN A SOUTHWEST TO NORTHEAST CORRIDOR
ALIGNING WITH FRONTOGENESIS...INCLUDING OVER CHICAGO. HAVE HAD A
COUPLE LIGHTNING STRIKES NEAR PONTIAC IN THE PAST COUPLE HOURS AND
JUST PRIOR TO THAT SEVERAL REPORTS THROUGH SOCIAL MEDIA OF HEARING
THUNDER. SO SOME EMBEDDED HEAVIER RATES ARE LIKELY WITHIN THIS
AXIS GIVEN REFLECTIVITY AND JUST WHAT IS OCCURRING OUT THE WINDOW
IN ROMEOVILLE...INCLUDING WITH LARGE FLAKES COMMON OF HIGH MIXING
RATIO SCENARIOS.
CONTINUE THE WARNING FOR THE CHICAGO METRO AREA AND FAR NORTHWEST
INDIANA BUT MOVE UP THE EXPIRATION TIME TO 11 AM...AND IT COULD
END UP BEING CANCELLED EVEN EARLIER IF BLOWING SNOW AND ATTENDANT
IMPACTS ARE DETERMINED TO BE LESS.
FURTHER TO THE SOUTHEAST...MAINLY SOUTH OF A PONTIAC TO RENSSELAER
LINE...GREATER ELEVATED INSTABILITY IS PRESENT PER LOOK OF RADAR
ECHOES AND RAP ANALYSIS. MUCH OF THIS AREA HOWEVER CHANGED OVER
TO ALL SNOW ONLY AT 2-330 AM AND THUS ACCUMULATIONS LOOK
LIMITED...WHICH WE KNEW WOULD COULD OCCUR. SOME OF THE HEAVIEST
CONVECTION JUST MISSED OVERRIDING THIS AREA HAS NOW SKIRTED INTO
NORTHERN INDIANA. SO FOR THAT REASON AND REPORTS RECEIVED THROUGH
DISPATCH...HAVE DOWNGRADED THOSE SOUTHERN AREAS...AS BLOWING SNOW
SHOULD BE QUITE LIMITED THIS MORNING.
REST OF TODAY...
THE PRIMARY CHANGES IN THE FORECAST WERE A QUICKER DIMINISHING OF
ANY LIGHT SNOW CHANCES AS WELL AS TO BUMP UP TEMPERATURES NAMELY
THIS MORNING. DEEP DRY AIR AND SUPPRESSION LOOK TO MOVE QUICKLY
INTO THE AREA BY LATE MORNING BEHIND THIS SYSTEM. CONTINUING LOW-
LEVEL CYCLOGENESIS OFF TO THE EAST WILL DRIVE COLD AIR ADVECTION
INTO THE REGION...AND PROFILES WILL BE SUPPORTIVE OF KEEPING
STRATOCU AND MAYBE SOME FLURRIES INTO EARLY TO MID AFTERNOON.
TEMPERATURES ARE FAIRLY HOMOGENEOUS UP TO CENTRAL/SOUTHERN WI
EARLY THIS MORNING...SO LOW-LEVEL THERMAL ADVECTION LOOKS TO BE
NEUTRAL THROUGH DAYBREAK AND THEN SLIGHT COLD AIR ADVECTION THIS
MORNING. TEMPERATURES SHOULD LEVEL OUT THIS AFTERNOON AS AT LEAST
SOME MARCH SUNSHINE OFFSETS ANY COLD AIR ADVECTION. WITH NOT AS
COLD OF AIR QUICKLY COMING INTO THE AREA...THE POSSIBILITY OF LAKE
EFFECT SNOW SHOWERS INTO NORTHWEST INDIANA LOOKS QUITE SMALL...BUT
POSSIBLY SOME CLOUDS GENERATING INTO LAKE AND PORTER COUNTIES THIS
AFTERNOON.
TONIGHT...
HIGH PRESSURE WILL MOVE OVER THE REGION TONIGHT AND SET THE STAGE
FOR A COLD NIGHT BY MID-MARCH STANDARDS. HIGH CLOUDS DO LOOK TO
SPILL INTO THE WESTERN FORECAST AREA AS THE NIGHT PROGRESSES AS A
SHEARED WEAK SHORTWAVE DROPS SOUTHWARD ON THE BACKSIDE OF THE
DEVELOPING LONGWAVE TROUGH. BUT IT LOOKS TO BE A LITTLE TOO LATE
TO STOP TEMPERATURES FROM DROPPING NICELY OVER FRESH SNOW COVER
THIS EVE INTO EARLY OVERNIGHT. FORECAST TEMPERATURES WITH MODEST
CONFIDENCE ARE SINGLE DIGITS IN OUTLYING AREAS TO 10 TO 15 IN THE
CHICAGO METRO. THAT LINES UP WITH THE 850MB TEMPERATURES OF -12C
TO -15C ACROSS THE FORECAST AREA BY TONIGHT...WHICH ARE WELL BELOW
CLIMO. IF CLOUDS WERE TO MOVE IN QUICKER IT WOULD RESULT IN MINS
POTENTIALLY QUITE A BIT WARMER.
THURSDAY AND BEYOND...
WHILE THE UPPER FLOW PATTERN BECOMES NORTHWEST AND REMAINS DECENTLY
ACTIVE THROUGH THE REST OF THE FORECAST PERIOD...WE REMAIN ON THE
ANTICYCLONIC SIDE. THUS WE LOOK TO FREQUENTLY MISS THE BEST
FORCING AND DEEPER SATURATION OF EACH QUICK-MOVING SYSTEM. IT DOES
MAKE FOR A CHALLENGE WITH TEMPERATURES...ESPECIALLY WEIGHING
RECENT SNOW COVER AND OCCASIONALLY PASSING CLOUD COVER. DO
MAINTAIN A SMALL CHANCE FOR LIGHT SNOW THURSDAY MORNING IN
NORTHERN AREAS AS WARM AIR ADVECTION ALOFT MOVES IN BEHIND THE
TROUGH. SATURATION LOOKS TO BE A PROBLEM...BUT THE ISENTROPIC
ASCENT IS PRETTY STRONG AND SATURATION ON BOTH THE NAM AND GFS IS
DEPICTED TO BE LOW ENOUGH FOR SOME LIGHT SNOW TO REACH THE
GROUND...IF IT CAN MATERIALIZE.
FRIDAY LOOKS MILD WITH TEMPERATURES POTENTIALLY PUSHING 50 DEGREES
AS WEST SOUTHWEST LOW-LEVEL FLOW BRING A WARM SECTOR OF ONE OF
THE QUICK-MOVING SYSTEMS INTO OUR AREA.
HAVE GONE WITH AN GFS/EC BLEND FOR THE WEEKEND INTO EARLY NEXT
WEEK. THE GFS IS CONSIDERABLY COLDER FOR SUNDAY AND SUNDAY NIGHT
WITH A STRONG CANADIAN HIGH PASSING OVER THE AREA...WHILE THE EC
FAVORS THIS FEATURE TO BE MUCH FURTHER NORTH AND WEAKER.
MTF
&&
.AVIATION...
//ORD AND MDW CONCERNS...UPDATED 12Z...
* LIGHT SNOW ENDING BY 13Z.
* BLOWING SNOW THIS MORNING.
* MVFR CIGS THROUGH THIS AFTERNOON.
* STRONG/GUSTY NORTHERLY WINDS THROUGH MID/LATE AFTERNOON. CMS
//DISCUSSION...UPDATED 12Z...
BACK EDGE OF LIGHT SNOW WILL BE MOVING EAST OF MDW/GYY BY 13Z.
STILL THE POTENTIAL FOR SOME FLURRIES OR VERY LIGHT SNOW THROUGH
MID MORNING BUT NOT EXPECTING ANY VIS/CIGS RESTRICTIONS. BLOWING
SNOW/LOW DRIFTING SNOW WILL CONTINUE INTO THIS AFTERNOON. ONCE
SNOW ENDS...MVFR CIGS WILL CONTINUE INTO THIS AFTERNOON THEN
SCATTER OUT BY EVENING WITH SKC EXPECTED TONIGHT.
STRONG/GUSTY NORTHERLY WINDS WILL CONTINUE THROUGH MUCH OF THE DAY
WITH GUSTS AS HIGH AS 30KTS FOR THE NEXT FEW HOURS...THEN GUSTS
WILL DIMINISH INTO THE MID/UPPER 20KT RANGE BY LATE MORNING...
SLOWLY AND STEADILY DIMINISHING THROUGH AFTERNOON WITH GUSTS
ENDING WITH SUNSET. WINDS WILL BECOME LIGHT AND VARIABLE OVERNIGHT
AS A RIDGE OF HIGH PRESSURE MOVES ACROSS THE AREA. CMS
//ORD AND MDW CONFIDENCE...UPDATED 12Z...
* HIGH FOR SNOW END TIMING.
* HIGH FOR CIG TRENDS.
* HIGH FOR WINDS SPEEDS/GUSTS/DIRECTIONS. CMS
//OUTLOOK FOR ORD/MDW FOR 00Z FRIDAY-12Z WEDNESDAY...UPDATED 12Z...
* THURSDAY NIGHT...DRY/VFR.
* FRIDAY...DRY/VFR. GUSTY WESTERLY WINDS.
* SATURDAY THROUGH SUNDAY...DRY/VFR.
* TUESDAY...CHANCE OF RAIN/SNOW. MVFR POSSIBLE.
&&
.MARINE...
210 PM CDT
LOW PRESSURE OVER THE CENTRAL PLAINS WILL CONTINUE TO DEEPEN AS IT
TRACKS EAST ACROSS SOUTHERN ILLINOIS TONIGHT AND INTO THE OHIO
VALLEY WEDNESDAY. AS THE LOW TRACKS SOUTH AND THEN SOUTHEAST OF THE
LAKE...HIGH PRESSURE WILL ALSO BUILD ACROSS THE UPPER GREAT LAKES
REGION...SETTING UP STRONG NORTH WINDS. THE COMBINATION OF A STRONG
GRADIENT AND STRONG COLD ADVECTION WILL LEAD TO WINDS QUICKLY
INCREASING TO GALES BY LATE THIS EVENING. THE LATEST GUIDANCE HAS
BEEN RELATIVELY CONSISTENT IN INDICATING THE POTENTIAL FOR HIGH END
GALES BY LATE WEDNESDAY MORNING AND EARLY AFTERNOON...WITH THE
STRONGEST GALES OVER THE SOUTHERN PORTIONS OF THE LAKE...INCLUDING
THE NEARSHORE WATERS. BY WEDNESDAY EVENING...THE HIGH PRESSURE WILL
BEGIN TO SPREAD ACROSS LAKE MICHIGAN ALLOWING WINDS TO SUBSIDE BELOW
GALE FORCE. BY THURSDAY NIGHT...THE HIGH WILL PUSH TO THE SOUTHEAST
OF THE LAKE AS A CLIPPER DROPS OUT OF NORTHERN ALBERTA AND SWINGS
JUST NORTH OF THE UPPER GREAT LAKES ON FRIDAY. WITH THE SFC HIGH
SAGGING OFF THE SERN COAST...A PERIOD OF SWLY WINDS WILL DEVELOP
AHEAD OF AN APPROACHING COLD FRONT TRAILING FROM THE CLIPPER.
ANTICIPATE A PERIOD OF BRISK SLY TO SWLY WINDS FOR THURSDAY NIGHT
THROUGH FRIDAY...BUT MORE GALES ARE NOT EXPECTED AT THIS TIME. AS
THE CLIPPER TURNS NEWD INTO QUEBEC...IT WILL DRAG A WEAK COLD FRONT
DOWN THE LAKE WITH ANOTHER ARCTIC HIGH BUILDING IN BEHIND THE
FRONT. 25-30KT NORTH WINDS WILL SET UP FOLLOWING THE FROPA FOR
SATURDAY NIGHT AND SUNDAY...BUT AS THE HIGH SPREADS ACROSS THE GREAT
LAKES SUNDAY NIGHT...WINDS SHOULD BECOME MORE LIGHT AND VARIABLE.
KREIN
&&
.LOT WATCHES/WARNINGS/ADVISORIES...
IL...WINTER STORM WARNING...ILZ013-ILZ014-ILZ020-ILZ021-ILZ022-ILZ023
UNTIL 11 AM WEDNESDAY.
WINTER WEATHER ADVISORY...ILZ006-ILZ011-ILZ012 UNTIL 7 AM
WEDNESDAY.
WINTER WEATHER ADVISORY...ILZ019-ILZ032-ILZ033-ILZ039 UNTIL 11
AM WEDNESDAY.
IN...WINTER STORM WARNING...INZ001-INZ002 UNTIL 11 AM WEDNESDAY.
WINTER WEATHER ADVISORY...INZ010-INZ011-INZ019 UNTIL 11 AM
WEDNESDAY.
LM...GALE WARNING...LMZ080-LMZ669-LMZ671-LMZ673-LMZ675-LMZ740-LMZ741-
LMZ742-LMZ743-LMZ744-LMZ745-LMZ777-LMZ779-LMZ870-LMZ872-
LMZ874-LMZ876-LMZ878 UNTIL 10 PM WEDNESDAY.
GALE WARNING...LMZ261-LMZ362-LMZ364-LMZ366-LMZ563-LMZ565-LMZ567-
LMZ868 UNTIL 7 PM WEDNESDAY.
&&
$$
VISIT US AT HTTP://WEATHER.GOV/CHICAGO (ALL LOWERCASE)
FOLLOW US ON FACEBOOK...TWITTER...AND YOUTUBE AT:
WWW.FACEBOOK.COM/US.NATIONALWEATHERSERVICE.CHICAGO.GOV
WWW.TWITTER.COM/NWSCHICAGO
WWW.YOUTUBE.COM/NWSCHICAGO
AREA FORECAST DISCUSSION
NWS CHICAGO/ROMEOVILLE IL
427 AM CDT WED MAR 12 2014
.MESOSCALE DISCUSSION...
350 AM CDT
HAVE MADE SOME ADJUSTMENTS TO HEADLINES...NAMELY TO BRING UP
EXPIRATION TIMES...INCLUDING WARNING FOR THE CHICAGO AREA. ALSO
DID DOWNGRADE THE WARNING IN A HANDFUL OF COUNTIES THAT EITHER 1.
RECEIVED CONSIDERABLY LESS SNOWFALL THAN ORIGINALLY FORECAST OR 2.
WILL HAVE AN EARLIER END TIME WITH LESS BLOWING SNOW THAN INITIALLY
THOUGHT AND THUS IMPACTS AFTER SUNRISE WILL BE CONSIDERABLY
LESS...SO DID NOT FEEL WARNING WAS ANY LONGER APPROPRIATE FOR
THOSE AREAS.
THE VERY WELL-DEFINED UPPER LOW IS ENTERING WESTERN IL AS OF 330
AM WITH FURTHER AMPLIFICATION OCCURRING AS NORTHERN STREAM SHORT
WAVE FROM MN DIGS SOUTHEAST TOWARD/INTO THIS SYSTEM. THE
DEFORMATION AREA SEEMS TO BE FOLLOWING SUIT...WITH INCREASED
REFLECTIVITY SINCE 300 AM IN A SOUTHWEST TO NORTHEAST CORRIDOR
ALIGNING WITH FRONTOGENESIS...INCLUDING OVER CHICAGO. HAVE HAD A
COUPLE LIGHTNING STRIKES NEAR PONTIAC IN THE PAST COUPLE HOURS AND
JUST PRIOR TO THAT SEVERAL REPORTS THROUGH SOCIAL MEDIA OF HEARING
THUNDER. SO SOME EMBEDDED HEAVIER RATES ARE LIKELY WITHIN THIS
AXIS GIVEN REFLECTIVITY AND JUST WHAT IS OCCURRING OUT THE WINDOW
IN ROMEOVILLE...INCLUDING WITH LARGE FLAKES COMMON OF HIGH MIXING
RATIO SCENARIOS.
CONTINUE THE WARNING FOR THE CHICAGO METRO AREA AND FAR NORTHWEST
INDIANA BUT MOVE UP THE EXPIRATION TIME TO 11 AM...AND IT COULD
END UP BEING CANCELLED EVEN EARLIER IF BLOWING SNOW AND ATTENDANT
IMPACTS ARE DETERMINED TO BE LESS.
FURTHER TO THE SOUTHEAST...MAINLY SOUTH OF A PONTIAC TO RENSSELAER
LINE...GREATER ELEVATED INSTABILITY IS PRESENT PER LOOK OF RADAR
ECHOES AND RAP ANALYSIS. MUCH OF THIS AREA HOWEVER CHANGED OVER
TO ALL SNOW ONLY AT 2-330 AM AND THUS ACCUMULATIONS LOOK
LIMITED...WHICH WE KNEW WOULD COULD OCCUR. SOME OF THE HEAVIEST
CONVECTION JUST MISSED OVERRIDING THIS AREA HAS NOW SKIRTED INTO
NORTHERN INDIANA. SO FOR THAT REASON AND REPORTS RECEIVED THROUGH
DISPATCH...HAVE DOWNGRADED THOSE SOUTHERN AREAS...AS BLOWING SNOW
SHOULD BE QUITE LIMITED THIS MORNING.
REST OF TODAY...
THE PRIMARY CHANGES IN THE FORECAST WERE A QUICKER DIMINISHING OF
ANY LIGHT SNOW CHANCES AS WELL AS TO BUMP UP TEMPERATURES NAMELY
THIS MORNING. DEEP DRY AIR AND SUPPRESSION LOOK TO MOVE QUICKLY
INTO THE AREA BY LATE MORNING BEHIND THIS SYSTEM. CONTINUING LOW-
LEVEL CYCLOGENESIS OFF TO THE EAST WILL DRIVE COLD AIR ADVECTION
INTO THE REGION...AND PROFILES WILL BE SUPPORTIVE OF KEEPING
STRATOCU AND MAYBE SOME FLURRIES INTO EARLY TO MID AFTERNOON.
TEMPERATURES ARE FAIRLY HOMOGENEOUS UP TO CENTRAL/SOUTHERN WI
EARLY THIS MORNING...SO LOW-LEVEL THERMAL ADVECTION LOOKS TO BE
NEUTRAL THROUGH DAYBREAK AND THEN SLIGHT COLD AIR ADVECTION THIS
MORNING. TEMPERATURES SHOULD LEVEL OUT THIS AFTERNOON AS AT LEAST
SOME MARCH SUNSHINE OFFSETS ANY COLD AIR ADVECTION. WITH NOT AS
COLD OF AIR QUICKLY COMING INTO THE AREA...THE POSSIBILITY OF LAKE
EFFECT SNOW SHOWERS INTO NORTHWEST INDIANA LOOKS QUITE SMALL...BUT
POSSIBLY SOME CLOUDS GENERATING INTO LAKE AND PORTER COUNTIES THIS
AFTERNOON.
TONIGHT...
HIGH PRESSURE WILL MOVE OVER THE REGION TONIGHT AND SET THE STAGE
FOR A COLD NIGHT BY MID-MARCH STANDARDS. HIGH CLOUDS DO LOOK TO
SPILL INTO THE WESTERN FORECAST AREA AS THE NIGHT PROGRESSES AS A
SHEARED WEAK SHORTWAVE DROPS SOUTHWARD ON THE BACKSIDE OF THE
DEVELOPING LONGWAVE TROUGH. BUT IT LOOKS TO BE A LITTLE TOO LATE
TO STOP TEMPERATURES FROM DROPPING NICELY OVER FRESH SNOW COVER
THIS EVE INTO EARLY OVERNIGHT. FORECAST TEMPERATURES WITH MODEST
CONFIDENCE ARE SINGLE DIGITS IN OUTLYING AREAS TO 10 TO 15 IN THE
CHICAGO METRO. THAT LINES UP WITH THE 850MB TEMPERATURES OF -12C
TO -15C ACROSS THE FORECAST AREA BY TONIGHT...WHICH ARE WELL BELOW
CLIMO. IF CLOUDS WERE TO MOVE IN QUICKER IT WOULD RESULT IN MINS
POTENTIALLY QUITE A BIT WARMER.
THURSDAY AND BEYOND...
WHILE THE UPPER FLOW PATTERN BECOMES NORTHWEST AND REMAINS DECENTLY
ACTIVE THROUGH THE REST OF THE FORECAST PERIOD...WE REMAIN ON THE
ANTICYCLONIC SIDE. THUS WE LOOK TO FREQUENTLY MISS THE BEST
FORCING AND DEEPER SATURATION OF EACH QUICK-MOVING SYSTEM. IT DOES
MAKE FOR A CHALLENGE WITH TEMPERATURES...ESPECIALLY WEIGHING
RECENT SNOW COVER AND OCCASIONALLY PASSING CLOUD COVER. DO
MAINTAIN A SMALL CHANCE FOR LIGHT SNOW THURSDAY MORNING IN
NORTHERN AREAS AS WARM AIR ADVECTION ALOFT MOVES IN BEHIND THE
TROUGH. SATURATION LOOKS TO BE A PROBLEM...BUT THE ISENTROPIC
ASCENT IS PRETTY STRONG AND SATURATION ON BOTH THE NAM AND GFS IS
DEPICTED TO BE LOW ENOUGH FOR SOME LIGHT SNOW TO REACH THE
GROUND...IF IT CAN MATERIALIZE.
FRIDAY LOOKS MILD WITH TEMPERATURES POTENTIALLY PUSHING 50 DEGREES
AS WEST SOUTHWEST LOW-LEVEL FLOW BRING A WARM SECTOR OF ONE OF
THE QUICK-MOVING SYSTEMS INTO OUR AREA.
HAVE GONE WITH AN GFS/EC BLEND FOR THE WEEKEND INTO EARLY NEXT
WEEK. THE GFS IS CONSIDERABLY COLDER FOR SUNDAY AND SUNDAY NIGHT
WITH A STRONG CANADIAN HIGH PASSING OVER THE AREA...WHILE THE EC
FAVORS THIS FEATURE TO BE MUCH FURTHER NORTH AND WEAKER.
MTF
&&
.AVIATION...
//ORD AND MDW CONCERNS...UPDATED 06Z...
* HEAVY SNOW THROUGH 10Z-11Z WITH VLIFR CIGS/VIS.
* STRONG/GUSTY NORTHERLY WINDS THROUGH MID/LATE AFTERNOON.
* MVFR CIGS AFTER SNOW ENDS THROUGH MID AFTERNOON. CMS
//DISCUSSION...UPDATED 06Z...
PRECIPITATION HAS TRANSITIONED TO A WET SNOW ACROSS THE CHICAGO
TERMINALS WITH A MIX OF RAIN STILL POSSIBLE ALONG A GYY/JOT LINE.
LARGE AREA OF SNOW OVER SOUTHEAST IA/NORTHERN MO AND WESTERN IL
WILL CONTINUE EAST/NORTHEAST ACROSS THE TERMINALS THROUGH THE
EARLY MORNING HOURS WITH PREVAILING MODERATE SNOW EXPECTED.
PERIODS/BURSTS OF HEAVY SNOW ALSO POSSIBLE AND MAINTAINED PREVIOUS
TEMPO. WITH A SHARP EDGE EXPECTED ALONG THE NORTHERN EDGE OF THE
SNOW...PREVAILING VISIBILITIES AT ORD/DPA COULD BE A BIT HIGHER
THAN ADVERTISED AND WILL NEED TO MONITOR TRENDS OVER THE NEXT FEW
HOURS. STILL A FEW LIGHTNING STRIKES...AT TIMES...WHICH WILL BE
POSSIBLE IN THE BURSTS OF HEAVIER SNOW BUT EXPECTED COVERAGE TOO
LOW FOR MENTION IN THE FORECAST. SHORT TERM/HI RES GUIDANCE IN
GOOD AGREEMENT WITH THE HEAVIEST SNOW SHIFTING EAST OF THE CHICAGO
TERMINALS 10Z-11Z WITH RAPID IMPROVEMENT IN BOTH CIGS AND VIS
EXPECTED IN THE 11Z-13Z TIME PERIOD.
FURTHER NORTHWEST AT RFD...PERIOD OF LIGHT SNOW STILL POSSIBLE FOR
A FEW HOURS...BUT HEAVIER SNOW AND LOWER CONDITIONS APPEAR TO
REMAIN SOUTH OF RFD.
NORTH/NORTHEAST WINDS HAVE BEEN GUSTING INTO THE 20-25KT RANGE AT
TIMES BUT ONE MINUTE DATA AT ORD/MDW HAVE BEEN RELATIVELY GUST
FREE SINCE PRECIP HAS CHANGED OVER TO SNOW. WINDS WILL INCREASE
OVERNIGHT...BUT NOT QUITE AS FAST OR STRONG AS PREVIOUSLY
EXPECTED. STRONGEST WINDS LIKELY TO OCCUR AFTER SNOW ENDS AND
CONTINUE FOR MUCH OF THE DAY WITH NORTHERLY DIRECTIONS. SNOW IS
FAIRLY WET WITH TEMPS STILL IN THE LOWER 30S AND WITH EXPECTED
LOWER SPEEDS/GUSTS DURING MUCH OF THE FALLING SNOW...HAVE REMOVED
BLOWING SNOW...WHICH MAY STILL BE POSSIBLE WITH ANY LIGHTER/DRIER
SNOW THAT FALLS AS SNOWFALL IS ENDING TOWARD DAYBREAK. CMS
//ORD AND MDW CONFIDENCE...UPDATED 06Z...
* HIGH FOR SNOW/CIG/VIS TRENDS.
* MEDIUM FOR WIND SPEEDS/GUSTS/DIRECTIONS AND TIMING.
* MEDIUM FOR MVFR CIGS INTO THIS AFTERNOON. CMS
//OUTLOOK FOR ORD/MDW FOR 12Z THURSDAY-12Z TUESDAY...UPDATED 00Z...
* THURSDAY...DRY/VFR. GUSTY SOUTHWEST WINDS.
* FRIDAY...DRY/VFR. GUSTY WESTERLY WINDS.
* SATURDAY...DRY/VFR.
* SUNDAY...SLIGHT CHANCE OF SNOW.
* MONDAY...DRY/VFR.
KJB
&&
.MARINE...
210 PM CDT
LOW PRESSURE OVER THE CENTRAL PLAINS WILL CONTINUE TO DEEPEN AS IT
TRACKS EAST ACROSS SOUTHERN ILLINOIS TONIGHT AND INTO THE OHIO
VALLEY WEDNESDAY. AS THE LOW TRACKS SOUTH AND THEN SOUTHEAST OF THE
LAKE...HIGH PRESSURE WILL ALSO BUILD ACROSS THE UPPER GREAT LAKES
REGION...SETTING UP STRONG NORTH WINDS. THE COMBINATION OF A STRONG
GRADIENT AND STRONG COLD ADVECTION WILL LEAD TO WINDS QUICKLY
INCREASING TO GALES BY LATE THIS EVENING. THE LATEST GUIDANCE HAS
BEEN RELATIVELY CONSISTENT IN INDICATING THE POTENTIAL FOR HIGH END
GALES BY LATE WEDNESDAY MORNING AND EARLY AFTERNOON...WITH THE
STRONGEST GALES OVER THE SOUTHERN PORTIONS OF THE LAKE...INCLUDING
THE NEARSHORE WATERS. BY WEDNESDAY EVENING...THE HIGH PRESSURE WILL
BEGIN TO SPREAD ACROSS LAKE MICHIGAN ALLOWING WINDS TO SUBSIDE BELOW
GALE FORCE. BY THURSDAY NIGHT...THE HIGH WILL PUSH TO THE SOUTHEAST
OF THE LAKE AS A CLIPPER DROPS OUT OF NORTHERN ALBERTA AND SWINGS
JUST NORTH OF THE UPPER GREAT LAKES ON FRIDAY. WITH THE SFC HIGH
SAGGING OFF THE SERN COAST...A PERIOD OF SWLY WINDS WILL DEVELOP
AHEAD OF AN APPROACHING COLD FRONT TRAILING FROM THE CLIPPER.
ANTICIPATE A PERIOD OF BRISK SLY TO SWLY WINDS FOR THURSDAY NIGHT
THROUGH FRIDAY...BUT MORE GALES ARE NOT EXPECTED AT THIS TIME. AS
THE CLIPPER TURNS NEWD INTO QUEBEC...IT WILL DRAG A WEAK COLD FRONT
DOWN THE LAKE WITH ANOTHER ARCTIC HIGH BUILDING IN BEHIND THE
FRONT. 25-30KT NORTH WINDS WILL SET UP FOLLOWING THE FROPA FOR
SATURDAY NIGHT AND SUNDAY...BUT AS THE HIGH SPREADS ACROSS THE GREAT
LAKES SUNDAY NIGHT...WINDS SHOULD BECOME MORE LIGHT AND VARIABLE.
KREIN
&&
.LOT WATCHES/WARNINGS/ADVISORIES...
IL...WINTER STORM WARNING...ILZ013-ILZ014-ILZ020-ILZ021-ILZ022-ILZ023
UNTIL 11 AM WEDNESDAY.
WINTER WEATHER ADVISORY...ILZ006-ILZ011-ILZ012 UNTIL 7 AM
WEDNESDAY.
WINTER WEATHER ADVISORY...ILZ019-ILZ032-ILZ033-ILZ039 UNTIL 11
AM WEDNESDAY.
IN...WINTER STORM WARNING...INZ001-INZ002 UNTIL 11 AM WEDNESDAY.
WINTER WEATHER ADVISORY...INZ010-INZ011-INZ019 UNTIL 11 AM
WEDNESDAY.
LM...GALE WARNING...LMZ080-LMZ669-LMZ671-LMZ673-LMZ675-LMZ740-LMZ741-
LMZ742-LMZ743-LMZ744-LMZ745-LMZ777-LMZ779-LMZ870-LMZ872-
LMZ874-LMZ876-LMZ878 UNTIL 10 PM WEDNESDAY.
GALE WARNING...LMZ261-LMZ362-LMZ364-LMZ366-LMZ563-LMZ565-LMZ567-
LMZ868 UNTIL 7 PM WEDNESDAY.
&&
$$
VISIT US AT HTTP://WEATHER.GOV/CHICAGO (ALL LOWERCASE)
FOLLOW US ON FACEBOOK...TWITTER...AND YOUTUBE AT:
WWW.FACEBOOK.COM/US.NATIONALWEATHERSERVICE.CHICAGO.GOV
WWW.TWITTER.COM/NWSCHICAGO
WWW.YOUTUBE.COM/NWSCHICAGO
AREA FORECAST DISCUSSION
NWS CHICAGO/ROMEOVILLE IL
410 AM CDT WED MAR 12 2014
.MESOSCALE DISCUSSION...
350 AM CDT
HAVE MADE SOME ADJUSTMENTS TO HEADLINES...NAMELY TO BRING UP
EXPIRATION TIMES...INCLUDING WARNING FOR THE CHICAGO AREA. ALSO
DID DOWNGRADE THE WARNING IN A HANDFUL OF COUNTIES THAT EITHER 1.
RECEIVED CONSIDERABLY LESS SNOWFALL THAN ORIGINALLY FORECAST OR 2.
WILL HAVE AN EARLIER END TIME WITH LESS BLOWING SNOW THAN INITIALLY
THOUGHT AND THUS IMPACTS AFTER SUNRISE WILL BE CONSIDERABLY
LESS...SO DID NOT FEEL WARNING WAS ANY LONGER APPROPRIATE FOR
THOSE AREAS.
THE VERY WELL-DEFINED UPPER LOW IS ENTERING WESTERN IL AS OF 330
AM WITH FURTHER AMPLIFICATION OCCURRING AS NORTHERN STREAM SHORT
WAVE FROM MN DIGS SOUTHEAST TOWARD/INTO THIS SYSTEM. THE
DEFORMATION AREA SEEMS TO BE FOLLOWING SUIT...WITH INCREASED
REFLECTIVITY SINCE 300 AM IN A SOUTHWEST TO NORTHEAST CORRIDOR
ALIGNING WITH FRONTOGENESIS...INCLUDING OVER CHICAGO. HAVE HAD A
COUPLE LIGHTNING STRIKES NEAR PONTIAC IN THE PAST COUPLE HOURS AND
JUST PRIOR TO THAT SEVERAL REPORTS THROUGH SOCIAL MEDIA OF HEARING
THUNDER. SO SOME EMBEDDED HEAVIER RATES ARE LIKELY WITHIN THIS
AXIS GIVEN REFLECTIVITY AND JUST WHAT IS OCCURRING OUT THE WINDOW
IN ROMEOVILLE...INCLUDING WITH LARGE FLAKES COMMON OF HIGH MIXING
RATIO SCENARIOS.
CONTINUE THE WARNING FOR THE CHICAGO METRO AREA AND FAR NORTHWEST
INDIANA BUT MOVE UP THE EXPIRATION TIME TO 11 AM...AND IT COULD
END UP BEING CANCELLED EVEN EARLIER IF BLOWING SNOW AND ATTENDANT
IMPACTS ARE DETERMINED TO BE LESS.
FURTHER TO THE SOUTHEAST...MAINLY SOUTH OF A PONTIAC TO RENSSELAER
LINE...GREATER ELEVATED INSTABILITY IS PRESENT PER LOOK OF RADAR
ECHOES AND RAP ANALYSIS. MUCH OF THIS AREA HOWEVER CHANGED OVER
TO ALL SNOW ONLY AT 2-330 AM AND THUS ACCUMULATIONS LOOK
LIMITED...WHICH WE KNEW WOULD COULD OCCUR. SOME OF THE HEAVIEST
CONVECTION JUST MISSED OVERRIDING THIS AREA HAS NOW SKIRTED INTO
NORTHERN INDIANA. SO FOR THAT REASON AND REPORTS RECEIVED THROUGH
DISPATCH...HAVE DOWNGRADED THOSE SOUTHERN AREAS...AS BLOWING SNOW
SHOULD BE QUITE LIMITED THIS MORNING.
REMAINDER OF DISCUSSION FORTHCOMING...
MTF
&&
.AVIATION...
//ORD AND MDW CONCERNS...UPDATED 09Z...
* MODERATE/HEAVY SNOW THROUGH 10Z-11Z WITH VLIFR CIGS/VIS.
* LIGHT SNOW THROUGH 12Z-14Z.
* STRONG/GUSTY NORTHERLY WINDS THROUGH MID/LATE AFTERNOON.
* MVFR CIGS AFTER SNOW ENDS THROUGH MID AFTERNOON. CMS
//DISCUSSION...UPDATED 09Z...
NO SIGNIFICANT CHANGES WITH THE 09Z UPDATE. BACK EDGE OF MODERATE
TO HEAVY SNOW NOW ALONG A MDW/JOT/C09 LINE AND SHIFTING EAST.
BEHIND THIS LINE WILL BE A 2-3 HOUR PERIOD OF LIGHT SNOW WITH VIS
GENERALLY AROUND 1SM. END OF THE SNOW NOW PUSHING ACROSS NORTHWEST
IL AND WILL PASS ACROSS THE CHICAGO AREA TERMINALS BETWEEN 12Z-14Z.
WINDS HAVE INCREASED WITH GUSTS ON ONE MINUTE DATA AT ORD/MDW
CURRENTLY IN THE UPPER 20KT RANGE. SO GUSTS AROUND 30KTS ON TRACK
FOR MUCH OF THE MORNING HOURS. CMS
PREVIOUS 06Z DISCUSSION...
PRECIPITATION HAS TRANSITIONED TO A WET SNOW ACROSS THE CHICAGO
TERMINALS WITH A MIX OF RAIN STILL POSSIBLE ALONG A GYY/JOT LINE.
LARGE AREA OF SNOW OVER SOUTHEAST IA/NORTHERN MO AND WESTERN IL
WILL CONTINUE EAST/NORTHEAST ACROSS THE TERMINALS THROUGH THE
EARLY MORNING HOURS WITH PREVAILING MODERATE SNOW EXPECTED.
PERIODS/BURSTS OF HEAVY SNOW ALSO POSSIBLE AND MAINTAINED PREVIOUS
TEMPO. WITH A SHARP EDGE EXPECTED ALONG THE NORTHERN EDGE OF THE
SNOW...PREVAILING VISIBILITIES AT ORD/DPA COULD BE A BIT HIGHER
THAN ADVERTISED AND WILL NEED TO MONITOR TRENDS OVER THE NEXT FEW
HOURS. STILL A FEW LIGHTNING STRIKES...AT TIMES...WHICH WILL BE
POSSIBLE IN THE BURSTS OF HEAVIER SNOW BUT EXPECTED COVERAGE TOO
LOW FOR MENTION IN THE FORECAST. SHORT TERM/HI RES GUIDANCE IN
GOOD AGREEMENT WITH THE HEAVIEST SNOW SHIFTING EAST OF THE CHICAGO
TERMINALS 10Z-11Z WITH RAPID IMPROVEMENT IN BOTH CIGS AND VIS
EXPECTED IN THE 11Z-13Z TIME PERIOD.
FURTHER NORTHWEST AT RFD...PERIOD OF LIGHT SNOW STILL POSSIBLE FOR
A FEW HOURS...BUT HEAVIER SNOW AND LOWER CONDITIONS APPEAR TO
REMAIN SOUTH OF RFD.
NORTH/NORTHEAST WINDS HAVE BEEN GUSTING INTO THE 20-25KT RANGE AT
TIMES BUT ONE MINUTE DATA AT ORD/MDW HAVE BEEN RELATIVELY GUST
FREE SINCE PRECIP HAS CHANGED OVER TO SNOW. WINDS WILL INCREASE
OVERNIGHT...BUT NOT QUITE AS FAST OR STRONG AS PREVIOUSLY
EXPECTED. STRONGEST WINDS LIKELY TO OCCUR AFTER SNOW ENDS AND
CONTINUE FOR MUCH OF THE DAY WITH NORTHERLY DIRECTIONS. SNOW IS
FAIRLY WET WITH TEMPS STILL IN THE LOWER 30S AND WITH EXPECTED
LOWER SPEEDS/GUSTS DURING MUCH OF THE FALLING SNOW...HAVE REMOVED
BLOWING SNOW...WHICH MAY STILL BE POSSIBLE WITH ANY LIGHTER/DRIER
SNOW THAT FALLS AS SNOWFALL IS ENDING TOWARD DAYBREAK. CMS
//ORD AND MDW CONFIDENCE...UPDATED 09Z...
* HIGH FOR SNOW/CIG/VIS TRENDS.
* MEDIUM FOR WIND SPEEDS/GUSTS/DIRECTIONS AND TIMING.
* MEDIUM FOR MVFR CIGS INTO THIS AFTERNOON. CMS
//OUTLOOK FOR ORD/MDW FOR 12Z THURSDAY-12Z TUESDAY...UPDATED 00Z...
* THURSDAY...DRY/VFR. GUSTY SOUTHWEST WINDS.
* FRIDAY...DRY/VFR. GUSTY WESTERLY WINDS.
* SATURDAY...DRY/VFR.
* SUNDAY...SLIGHT CHANCE OF SNOW.
* MONDAY...DRY/VFR.
KJB
&&
.MARINE...
410 AM...LOW PRESSURE OVER SOUTHERN INDIANA WILL DEEPEN THROUGH
TONIGHT WHEN IT REACHES NEW ENGLAND. THE GRADIENT WILL REMAIN TIGHT
AS HIGH PRESSURE BUILDS ACROSS THE UPPER MIDWEST AND ONTARIO. GALE
FORCE WINDS WILL SLOWLY DIMINISH FROM THE NORTH THIS AFTERNOON TO
THE SOUTH EARLY THIS EVENING. WINDS THEN QUICKLY DIMINISH AFTER
MIDNIGHT AS THE RIDGE PASSES OVER THE LAKE. WINDS TURN BACK
SOUTHWESTERLY ON THE BACK SIDE OF THE DEPARTING HIGH WITH A PERIOD
OF 30KTS EXPECTED THURSDAY INTO THURSDAY NIGHT AS LOW PRESSURE
MOVES ACROSS THE UPPER LAKES THURSDAY NIGHT INTO FRIDAY. A
TRAILING COLD FRONT WILL PUSH ACROSS THE LAKES FRIDAY AFTERNOON. A
LARGE HIGH WILL SETTLE ACROSS THE LAKES REGION SUNDAY INTO SUNDAY
NIGHT. CMS
&&
.LOT WATCHES/WARNINGS/ADVISORIES...
IL...WINTER STORM WARNING...ILZ013-ILZ014-ILZ020-ILZ021-ILZ022-ILZ023
UNTIL 11 AM WEDNESDAY.
WINTER WEATHER ADVISORY...ILZ006-ILZ011-ILZ012 UNTIL 7 AM
WEDNESDAY.
WINTER WEATHER ADVISORY...ILZ019-ILZ032-ILZ033-ILZ039 UNTIL 11
AM WEDNESDAY.
IN...WINTER STORM WARNING...INZ001-INZ002 UNTIL 11 AM WEDNESDAY.
WINTER WEATHER ADVISORY...INZ010-INZ011-INZ019 UNTIL 11 AM
WEDNESDAY.
LM...GALE WARNING...LMZ080-LMZ669-LMZ671-LMZ673-LMZ675-LMZ740-LMZ741-
LMZ742-LMZ743-LMZ744-LMZ745-LMZ777-LMZ779-LMZ870-LMZ872-
LMZ874-LMZ876-LMZ878 UNTIL 10 PM WEDNESDAY.
GALE WARNING...LMZ261-LMZ362-LMZ364-LMZ366-LMZ563-LMZ565-LMZ567-
LMZ868 UNTIL 7 PM WEDNESDAY.
&&
$$
VISIT US AT HTTP://WEATHER.GOV/CHICAGO (ALL LOWERCASE)
FOLLOW US ON FACEBOOK...TWITTER...AND YOUTUBE AT:
WWW.FACEBOOK.COM/US.NATIONALWEATHERSERVICE.CHICAGO.GOV
WWW.TWITTER.COM/NWSCHICAGO
WWW.YOUTUBE.COM/NWSCHICAGO
AREA FORECAST DISCUSSION
NWS CHICAGO/ROMEOVILLE IL
351 AM CDT WED MAR 12 2014
.MESOSCALE DISCUSSION...
350 AM CDT
HAVE MADE SOME ADJUSTMENTS TO HEADLINES...NAMELY TO BRING UP
EXPIRATION TIMES...INCLUDING WARNING FOR THE CHICAGO AREA. ALSO
DID DOWNGRADE THE WARNING IN A HANDFUL OF COUNTIES THAT EITHER 1.
RECEIVED CONSIDERABLY LESS SNOWFALL THAN ORIGINALLY FORECAST OR 2.
WILL HAVE AN EARLIER END TIME WITH LESS BLOWING SNOW THAN INITIALLY
THOUGHT AND THUS IMPACTS AFTER SUNRISE WILL BE CONSIDERABLY
LESS...SO DID NOT FEEL WARNING WAS ANY LONGER APPROPRIATE FOR
THOSE AREAS.
THE VERY WELL-DEFINED UPPER LOW IS ENTERING WESTERN IL AS OF 330
AM WITH FURTHER AMPLIFICATION OCCURRING AS NORTHERN STREAM SHORT
WAVE FROM MN DIGS SOUTHEAST TOWARD/INTO THIS SYSTEM. THE
DEFORMATION AREA SEEMS TO BE FOLLOWING SUIT...WITH INCREASED
REFLECTIVITY SINCE 300 AM IN A SOUTHWEST TO NORTHEAST CORRIDOR
ALIGNING WITH FRONTOGENESIS...INCLUDING OVER CHICAGO. HAVE HAD A
COUPLE LIGHTNING STRIKES NEAR PONTIAC IN THE PAST COUPLE HOURS AND
JUST PRIOR TO THAT SEVERAL REPORTS THROUGH SOCIAL MEDIA OF HEARING
THUNDER. SO SOME EMBEDDED HEAVIER RATES ARE LIKELY WITHIN THIS
AXIS GIVEN REFLECTIVITY AND JUST WHAT IS OCCURRING OUT THE WINDOW
IN ROMEOVILLE...INCLUDING WITH LARGE FLAKES COMMON OF HIGH MIXING
RATIO SCENARIOS.
CONTINUE THE WARNING FOR THE CHICAGO METRO AREA AND FAR NORTHWEST
INDIANA BUT MOVE UP THE EXPIRATION TIME TO 11 AM...AND IT COULD
END UP BEING CANCELLED EVEN EARLIER IF BLOWING SNOW AND ATTENDANT
IMPACTS ARE DETERMINED TO BE LESS.
FURTHER TO THE SOUTHEAST...MAINLY SOUTH OF A PONTIAC TO RENSSELAER
LINE...GREATER ELEVATED INSTABILITY IS PRESENT PER LOOK OF RADAR
ECHOES AND RAP ANALYSIS. MUCH OF THIS AREA HOWEVER CHANGED OVER
TO ALL SNOW ONLY AT 2-330 AM AND THUS ACCUMULATIONS LOOK
LIMITED...WHICH WE KNEW WOULD COULD OCCUR. SOME OF THE HEAVIEST
CONVECTION JUST MISSED OVERRIDING THIS AREA HAS NOW SKIRTED INTO
NORTHERN INDIANA. SO FOR THAT REASON AND REPORTS RECEIVED THROUGH
DISPATCH...HAVE DOWNGRADED THOSE SOUTHERN AREAS...AS BLOWING SNOW
SHOULD BE QUITE LIMITED THIS MORNING.
REMAINDER OF DISCUSSION FORTHCOMING...
MTF
&&
.DISCUSSION...
905 PM CDT
NO CHANGES PLANNED WITH THE CURRENT HEADLINES. THE LOW PRESSURE
HAS PUSHED EAST INTO CENTRAL MISSOURI THIS EVENING...AND CONTINUES
TO SLOWLY SLIDE EAST TO NORTHEAST. PRECIPITATION HAS TAKEN JUST A
LITTLE LONGER TO DEVELOP...HOWEVER LOCAL RADAR INDICATES SEVERAL
AREAS BEGINNING TO DEVELOP. IN ADDITION SOME CONVECTION HAS
DEVELOPED THIS EVENING AS WELL ACROSS THE FORECAST AREA...MAINLY
SOUTH OF I-88 IN NORTHERN IL. DUE TO THE LOW TOPPED NATURE OF
THESE THUNDERSTORMS...REPORTS OF PEA SIZE HAIL. TEMPERATURES WILL
BEGIN TO FALL...WHICH WILL LIKELY ALLOW A TRANSITION TOWARDS SNOW
LATER THIS EVENING. ONE ITEM THAT HAS BEEN UPDATED FOR TONIGHT WAS
TO INCLUDE THE MENTION OF SLT CHC THUNDER FOR AREAS ALONG AND
SOUTH OF I-80 IN NORTHERN IL/NORTHWEST IN. IT IS POSSIBLE THAT
ONCE THE STEADY HEAVY SNOW GETS GOING...THAT GIVEN HOW UNSTABLE
THE ENVIRONMENT REMAINS...THAT THUNDERSNOW MAY OCCUR IN A FEW
LOCATIONS ACROSS NORTHEAST IL/NORTHWEST IN...JUST SOUTH OF
CHICAGO.
BEACHLER
//PREV DISCUSSION...
355 PM CDT
HEADLINES...UPGRADED THE SOUTHEASTERN COUNTIES FROM A WINTER STORM
WATCH TO A WINTER STORM WARNING. OTHERWISE NO CHANGES WERE MADE TO
THE HEADLINES.
REST OF TODAY THROUGH WEDNESDAY AFTERNOON...
AN UPPER LEVEL TROUGH AXIS STRETCHES FROM HUDSON BAY THROUGH THE
NORTHERN ROCKIES...WITH ANOTHER WEAK SHORTWAVE IS MOVING INTO NORTH
DAKOTA AND NORTHERN MINNESOTA. THE SURFACE LOW IS OVER SOUTHEASTERN
KANSAS AND IS BEGINNING TO DEEPEN.
A STATIONARY FRONT IS OVER THE FAR SOUTHERN SECTION OF THE CWA...AND
STRETCHING FROM NORTHERN MO THROUGH LOGANSPORT INDIANA. TEMPS HAVE
BEEN RATHER IMPRESSIVE TODAY GIVEN THE CLOUD COVER. EVERYWHERE
JUMPED TO AT LEAST 40 WITH AREAS SOUTH OF I-88 REACHING INTO THE
UPPER 40S TO AROUND 60 IN CENTRAL IL. EVEN SEEING 40 DEGREE TEMPS
THROUGHOUT SOUTHERN WI DESPITE THE NORTHERLY WINDS. AS WINDS BECOME
NORTH ACROSS THE CWA WILL SEE TEMPS START TO FALL THIS AFTERNOON.
MAY HAVE TOO QUICK OF A TREND IN THE GRIDS...BUT EXPECTING TEMPS TO
FALL PRETTY QUICKLY.
THE LOW WILL CONTINUE TO DEEPEN AS IT CROSSES OVER SOUTHERN IL AND
CONTINUES EAST INTO THE UPPER OHIO RIVER VALLEY TOMORROW AFTERNOON.
HIGH PRESSURE IS CENTERED OVER MANITOBA AND IT WILL MOVE OVER SW
ONTARIO BY TOMORROW MORNING. AS SUCH THE PRESSURE GRADIENT WILL
TIGHTEN OVERNIGHT RESULTING IN STRONG WINDS. IN GENERAL WINDS WILL
BE 20-30 MPH WITH GUSTS UP TO 40 MPH. THE STRONGEST GUSTS...UP TO 45
MPH...WILL BE ALONG THE LAKESHORE.
RIGHT NOW THERE IS A BAND OF LIGHT RAIN OVER SOUTHERN WI AND A FEW
STRAY ECHOES OVER NW ILLINOIS. EXPECTING THAT BAND TO SLOWLY SHIFT
SOUTH INTO NORTHERN IL LATE THIS AFTERNOON AND INITIALLY FALL AS
RAIN. EXPECTING SNOW TO SPREAD ACROSS THE CENTRAL AND SOUTHWESTERN
PORTIONS OF THE CWA THIS EVENING AS THE LOW MOVES OVER SOUTHERN IL.
AT THE SAME TIME...THE MAIN TROUGH AXIS AND ASSOCIATED VORT STREAMER
WILL BE MOVING OVER THE MISSISSIPPI RIVER BRINGING IMPRESSIVE
FORCING TO THE REGION. GUIDANCE INDICATES THERE WILL BE A BAND OF
FRONTOGENESIS ASSOCIATED WITH NEGATIVE EPV ROUGHLY ALONG THE I-55
CORRIDOR. ADDITIONAL FORCING WILL BE PROVIDED BY THE UPPER LEVEL
JET. WE WILL BE UNDER THE LEFT EXIT REGION OF THE JET STREAK
ASSOCIATED WITH THE DEEPENING LOW...AND THEN AT THE NOSE OF THE JET
PUSHING IN FROM THE NORTH. ALL OF THIS FORCING IS OVER THE
DGZ...WHICH VARIES FROM 100MB TO 200MB DEEP. THEREFORE...KEPT THE
SAME IDEA AS THE PREVIOUS FORECAST WITH THE MAJORITY OF SNOW FALLING
OVERNIGHT TONIGHT. RATES OF 1-2 INCHES PER HOUR ARE EXPECTED ALONG
AND EAST OF I-55.
LEFT THUNDERSNOW OUT OF THE FORECAST BECAUSE DO NOT HAVE ENOUGH
CONFIDENCE IN IT. FORECAST SOUNDINGS FEATURE MINIMUM CAPE
VALUES...LESS THAN 50 J/KG. MAY SEE A RANDOM STRIKE OF LIGHTNING
ASSOCIATED WITH THE HEAVY SNOW...BUT NOT EXPECTING AN ABUNDANCE OF
THUNDERSNOW.
THEREFORE THE WINTER STORM WARNING IS FOR PERIODS OF HEAVY SNOW AND
NEAR BLIZZARD LIKE CONDITIONS WITH THE GUSTY WINDS. VISIBILITIES AT
OR BELOW A QUARTER OF A MILE ARE POSSIBLE OVERNIGHT AND INTO THE
PRE-DAWN HOURS WEDNESDAY MORNING. THE MORNING COMMUTE WILL PROBABLY
BE IMPACTED BY THE LINGERING SNOW AND GUSTY WINDS. EVEN IF IT IS
NOT SNOWING THAT HARD DURING THE COMMUTE...THE GUSTY WINDS WILL
LIKELY BE BLOWING SNOW AROUND AND REDUCING VISIBILITY.
SNOW INTENSITY DWINDLES TOMORROW MORNING AS FORCING AND SATURATION
IN THE DGZ BOTH DIMINISH. AS THE TROUGH MOVES THROUGH...THE SNOW
ENDS FROM WEST TO EAST. MAY SEE SOME LIGHT SNOW PERSIST OVER
NORTHWEST INDIANA AFTER THE WARNING EXPIRES...BUT THINKING THE MAIN
SHOW WILL BE OVER. SNOW TOTALS WILL VARY FROM 2 TO 4 INCHES ACROSS
THE IL/WI STATE LINE TO 4 TO 8 INCHES ALONG AND SOUTH OF I-88. MAY
SEE A FEW LOCALLY HIGHER TOTALS ESPECIALLY IF WE SEE SOME
THUNDERSNOW.
WINDS WILL BE DUE NORTH DOWN THE LAKE AND MAY SEE A FEW LIGHT SNOW
SHOWERS PRIMARILY OVER NORTHWEST INDIANA IN THE AFTERNOON. DO NOT
THINK THE SHOWERS WILL AMOUNT TO MUCH WITH THE EXTENSIVE ICE COVER
OVER THE LAKE. ALSO MAY SEE A FEW STRAY LIGHT SNOW SHOWERS OVER THE
WESTERN CWA LATE WEDNESDAY MORNING INTO EARLY WEDNESDAY AFTERNOON AS
ANOTHER VORT STREAMER MOVES THROUGH THE REGION. CONFIDENCE IS LOW
WITH THESE SNOW SHOWERS AS THE FORCING AND MOISTURE DO NOT LOOK
OVERLY IMPRESSIVE AT THIS TIME.
AS MENTIONED ABOVE...TEMPS WILL FALL LATER THIS AFTERNOON THROUGH
THIS EVENING WITH OVERNIGHT LOWS IN THE 20S. WITH THE STRONG
WINDS...WIND CHILLS WILL BE IN THE SINGLE DIGITS TONIGHT. TEMPS WILL
NOT REBOUND MUCH TOMORROW WITH THE HIGH TEMP BEING REACHED IN THE
MORNING. THE COLD AIR ASSOCIATED WITH THE TROUGH MOVES OVER THE
REGION DURING THE DAY...SO HIGH TEMPS WILL BE IN THE 20S. WIND
CHILLS WILL MAKE IT FEEL LIKE +10 OR LOWER.
WEDNESDAY NIGHT AND THURSDAY...
THE TROUGH SHIFTS EAST WEDNESDAY NIGHT AND UPPER LEVEL TEMPS BEGIN
TO RISE. OVERNIGHT LOWS WILL BE IN THE SINGLE DIGITS...EXCEPT 10-15
DEGREES OVER THE CITY. WIND CHILLS WILL BE AROUND ZERO WITH SOME
OUTLYING AREAS GETTING AS LOW AS -5.
THERE IS A SLIGHT CHANCE OF LIGHT SNOW NORTH OF I-88 THURSDAY
MORNING AS A WEAK WARM FRONT MOVES INTO THE REGION. FORCING DOES
NOT LOOK IMPRESSIVE WITH THE FRONT SO HAVE LOW CONFIDENCE IN THIS
CHANCE OF SNOW.
HIGH TEMPS ON THURSDAY WILL BE IN THE 30S DUE TO WAA ASSOCIATED WITH
THE FRONT. THE WARMING TREND CONTINUES OVERNIGHT WITH LOWS AROUND
30.
JEE
&&
.AVIATION...
//ORD AND MDW CONCERNS...UPDATED 06Z...
* HEAVY SNOW THROUGH 10Z-11Z WITH VLIFR CIGS/VIS.
* STRONG/GUSTY NORTHERLY WINDS THROUGH MID/LATE AFTERNOON.
* MVFR CIGS AFTER SNOW ENDS THROUGH MID AFTERNOON. CMS
//DISCUSSION...UPDATED 06Z...
PRECIPITATION HAS TRANSITIONED TO A WET SNOW ACROSS THE CHICAGO
TERMINALS WITH A MIX OF RAIN STILL POSSIBLE ALONG A GYY/JOT LINE.
LARGE AREA OF SNOW OVER SOUTHEAST IA/NORTHERN MO AND WESTERN IL
WILL CONTINUE EAST/NORTHEAST ACROSS THE TERMINALS THROUGH THE
EARLY MORNING HOURS WITH PREVAILING MODERATE SNOW EXPECTED.
PERIODS/BURSTS OF HEAVY SNOW ALSO POSSIBLE AND MAINTAINED PREVIOUS
TEMPO. WITH A SHARP EDGE EXPECTED ALONG THE NORTHERN EDGE OF THE
SNOW...PREVAILING VISIBILITIES AT ORD/DPA COULD BE A BIT HIGHER
THAN ADVERTISED AND WILL NEED TO MONITOR TRENDS OVER THE NEXT FEW
HOURS. STILL A FEW LIGHTNING STRIKES...AT TIMES...WHICH WILL BE
POSSIBLE IN THE BURSTS OF HEAVIER SNOW BUT EXPECTED COVERAGE TOO
LOW FOR MENTION IN THE FORECAST. SHORT TERM/HI RES GUIDANCE IN
GOOD AGREEMENT WITH THE HEAVIEST SNOW SHIFTING EAST OF THE CHICAGO
TERMINALS 10Z-11Z WITH RAPID IMPROVEMENT IN BOTH CIGS AND VIS
EXPECTED IN THE 11Z-13Z TIME PERIOD.
FURTHER NORTHWEST AT RFD...PERIOD OF LIGHT SNOW STILL POSSIBLE FOR
A FEW HOURS...BUT HEAVIER SNOW AND LOWER CONDITIONS APPEAR TO
REMAIN SOUTH OF RFD.
NORTH/NORTHEAST WINDS HAVE BEEN GUSTING INTO THE 20-25KT RANGE AT
TIMES BUT ONE MINUTE DATA AT ORD/MDW HAVE BEEN RELATIVELY GUST
FREE SINCE PRECIP HAS CHANGED OVER TO SNOW. WINDS WILL INCREASE
OVERNIGHT...BUT NOT QUITE AS FAST OR STRONG AS PREVIOUSLY
EXPECTED. STRONGEST WINDS LIKELY TO OCCUR AFTER SNOW ENDS AND
CONTINUE FOR MUCH OF THE DAY WITH NORTHERLY DIRECTIONS. SNOW IS
FAIRLY WET WITH TEMPS STILL IN THE LOWER 30S AND WITH EXPECTED
LOWER SPEEDS/GUSTS DURING MUCH OF THE FALLING SNOW...HAVE REMOVED
BLOWING SNOW...WHICH MAY STILL BE POSSIBLE WITH ANY LIGHTER/DRIER
SNOW THAT FALLS AS SNOWFALL IS ENDING TOWARD DAYBREAK. CMS
//ORD AND MDW CONFIDENCE...UPDATED 06Z...
* HIGH FOR SNOW/CIG/VIS TRENDS.
* MEDIUM FOR WIND SPEEDS/GUSTS/DIRECTIONS AND TIMING.
* MEDIUM FOR MVFR CIGS INTO THIS AFTERNOON. CMS
//OUTLOOK FOR ORD/MDW FOR 12Z THURSDAY-12Z TUESDAY...UPDATED 00Z...
* THURSDAY...DRY/VFR. GUSTY SOUTHWEST WINDS.
* FRIDAY...DRY/VFR. GUSTY WESTERLY WINDS.
* SATURDAY...DRY/VFR.
* SUNDAY...SLIGHT CHANCE OF SNOW.
* MONDAY...DRY/VFR.
KJB
&&
.MARINE...
210 PM CDT
LOW PRESSURE OVER THE CENTRAL PLAINS WILL CONTINUE TO DEEPEN AS IT
TRACKS EAST ACROSS SOUTHERN ILLINOIS TONIGHT AND INTO THE OHIO
VALLEY WEDNESDAY. AS THE LOW TRACKS SOUTH AND THEN SOUTHEAST OF THE
LAKE...HIGH PRESSURE WILL ALSO BUILD ACROSS THE UPPER GREAT LAKES
REGION...SETTING UP STRONG NORTH WINDS. THE COMBINATION OF A STRONG
GRADIENT AND STRONG COLD ADVECTION WILL LEAD TO WINDS QUICKLY
INCREASING TO GALES BY LATE THIS EVENING. THE LATEST GUIDANCE HAS
BEEN RELATIVELY CONSISTENT IN INDICATING THE POTENTIAL FOR HIGH END
GALES BY LATE WEDNESDAY MORNING AND EARLY AFTERNOON...WITH THE
STRONGEST GALES OVER THE SOUTHERN PORTIONS OF THE LAKE...INCLUDING
THE NEARSHORE WATERS. BY WEDNESDAY EVENING...THE HIGH PRESSURE WILL
BEGIN TO SPREAD ACROSS LAKE MICHIGAN ALLOWING WINDS TO SUBSIDE BELOW
GALE FORCE. BY THURSDAY NIGHT...THE HIGH WILL PUSH TO THE SOUTHEAST
OF THE LAKE AS A CLIPPER DROPS OUT OF NORTHERN ALBERTA AND SWINGS
JUST NORTH OF THE UPPER GREAT LAKES ON FRIDAY. WITH THE SFC HIGH
SAGGING OFF THE SERN COAST...A PERIOD OF SWLY WINDS WILL DEVELOP
AHEAD OF AN APPROACHING COLD FRONT TRAILING FROM THE CLIPPER.
ANTICIPATE A PERIOD OF BRISK SLY TO SWLY WINDS FOR THURSDAY NIGHT
THROUGH FRIDAY...BUT MORE GALES ARE NOT EXPECTED AT THIS TIME. AS
THE CLIPPER TURNS NEWD INTO QUEBEC...IT WILL DRAG A WEAK COLD FRONT
DOWN THE LAKE WITH ANOTHER ARCTIC HIGH BUILDING IN BEHIND THE
FRONT. 25-30KT NORTH WINDS WILL SET UP FOLLOWING THE FROPA FOR
SATURDAY NIGHT AND SUNDAY...BUT AS THE HIGH SPREADS ACROSS THE GREAT
LAKES SUNDAY NIGHT...WINDS SHOULD BECOME MORE LIGHT AND VARIABLE.
KREIN
&&
.LOT WATCHES/WARNINGS/ADVISORIES...
IL...WINTER STORM WARNING...ILZ013-ILZ014-ILZ020-ILZ021-ILZ022-ILZ023
UNTIL 11 AM WEDNESDAY.
WINTER WEATHER ADVISORY...ILZ006-ILZ011-ILZ012 UNTIL 7 AM
WEDNESDAY.
WINTER WEATHER ADVISORY...ILZ019-ILZ032-ILZ033-ILZ039 UNTIL 11
AM WEDNESDAY.
IN...WINTER STORM WARNING...INZ001-INZ002 UNTIL 11 AM WEDNESDAY.
WINTER WEATHER ADVISORY...INZ010-INZ011-INZ019 UNTIL 11 AM
WEDNESDAY.
LM...GALE WARNING...LMZ080-LMZ669-LMZ671-LMZ673-LMZ675-LMZ740-LMZ741-
LMZ742-LMZ743-LMZ744-LMZ745-LMZ777-LMZ779-LMZ870-LMZ872-
LMZ874-LMZ876-LMZ878 UNTIL 10 PM WEDNESDAY.
GALE WARNING...LMZ261-LMZ362-LMZ364-LMZ366-LMZ563-LMZ565-LMZ567-
LMZ868 UNTIL 7 PM WEDNESDAY.
&&
$$
VISIT US AT HTTP://WEATHER.GOV/CHICAGO (ALL LOWERCASE)
FOLLOW US ON FACEBOOK...TWITTER...AND YOUTUBE AT:
WWW.FACEBOOK.COM/US.NATIONALWEATHERSERVICE.CHICAGO.GOV
WWW.TWITTER.COM/NWSCHICAGO
WWW.YOUTUBE.COM/NWSCHICAGO
AREA FORECAST DISCUSSION
NWS INDIANAPOLIS IN
701 PM EDT WED MAR 12 2014
.UPDATE...
THE NEAR TERM SECTION HAS BEEN UPDATED BELOW.
&&
.SYNOPSIS...
ISSUED AT 321 PM EDT WED MAR 12 2014
MUCH COLDER AIR WILL RETURN INTO THE REGION TONIGHT WITH HIGH
PRESSURE. THE CHILLY WEATHER WILL BE SHORT-LIVED...AS THE PASSAGE OF
A WARM FRONT THURSDAY NIGHT WILL USHER IN MILDER TEMPERATURES
FRIDAY. AFTER A WEAK COLD FRONT BRINGS A CHANCE FOR LIGHT RAIN
FRIDAY NIGHT...COOLER WEATHER WILL RETURN INTO EARLY NEXT WEEK.
&&
.NEAR TERM /TONIGHT/...
ISSUED AT 701 PM EDT WED MAR 12 2014
DID A QUICK UPDATE TO ADD FLURRIES PAST 00Z ACROSS THE FAR WESTERN
FORECAST AREA AS RADAR SHOWS SNOW SHOWERS AND FLURRIES ACROSS
EASTERN ILLINOIS MOVING SOUTHEAST. KEPT MENTIONABLE POPS ACROSS THE
FAR SOUTHWEST WHO WILL HAVE THE BEST CHANCE /BUT STILL LOW/ OF
SEEING MEASURABLE SNOW.
PREVIOUS DISCUSSION FOLLOWS...
BACK EDGE OF THE LIGHT SNOW ASSOCIATED WITH THE LOW PRESSURE
MOVING ACROSS THE EASTERN HALF OF THE FORECAST AREA AS OF 19Z.
ANOTHER AREA OF WHAT APPEARS TO BE CONVECTIVE SNOW SHOWERS OVER
NORTHERN/CENTRAL ILLINOIS ASSOCIATED WITH AN UPPER LEVEL WAVE
CONTINUES TO MOVE SLOWLY SOUTHEAST. TEMPS HAVE BEEN GENERALLY
STEADY-STATE IN THE LOWER/MID 30S OVER THE LAST FEW HOURS.
WENT AHEAD AND DROPPED BOTH HEADLINES /WINTER WEATHER AND WIND
ADVISORIES/ AS SNOW HAS LIGHTENED CONSIDERABLY AND WIND GUSTS HAVE
DROPPED BELOW 40MPH. ADDITIONALLY...WITH A GENERALLY HEAVY WET SNOW
IN THE LOCATIONS WHERE SOME ACCUMULATION WAS EXPERIENCED...THE
BLOWING SNOW CONCERNS HAVE BEEN GREATLY DIMINISHED.
INITIAL ISSUE FOCUSES ON THE AREA OF SNOW OVER ILLINOIS. MOST SHORT
RANGE MODEL GUIDANCE STRUGGLING WITH THIS...BUT HRRR HINTS AT
BRINGING THE AXIS OF SNOW ACROSS THE LOWER WABASH VALLEY INTO THE
EVENING. ADDITIONALLY...RAP SOUNDINGS SHOWING SUBTLE INSTABILITY
PRESENT FOR THE NEXT FEW HOURS. WILL PUT LOW CHANCE POPS IN THROUGH
MID EVENING FROM TERRE HAUTE TO WASHINGTON AND POINTS WEST. EVEN
THOUGH MAY HAVE BRIEF BURSTS OF HEAVIER SNOW SHOWERS WITHIN
CONVECTION...SURFACE/GROUND TEMPS ARE ABOVE FREEZING AND EXPECT
IMPACTS TO BE MINIMAL.
REMAINDER OF THE FORECAST IS QUIET FOR TONIGHT AS WEAK HIGH PRESSURE
BUILDS IN OVERNIGHT. EXPECT SKIES TO BECOME CLEAR TONIGHT WITH WIND
GUSTS DIMINISHING DURING THE EVENING AS THE SURFACE PRESSURE
GRADIENT RELAXES.
TEMPS...COLD NIGHT BY MARCH STANDARDS AS CLEAR SKIES WITH A FRESH
SNOWPACK OVER NORTHERN COUNTIES SHOULD ENABLE TEMPS TO TUMBLE INTO
THE SINGLE DIGITS. EVEN FOR THE REMAINDER OF THE FORECAST AREA THAT
IS FREE OF SNOW COVER...EXPECT TEMPS TO BOTTOM OUT IN THE TEENS.
GENERALLY WENT WITH WARMER MAVMOS IN SNOW-FREE AREAS...AND MUCH
CLOSER TO COLDER METMOS OVER NORTHERN COUNTIES.
&&
.SHORT TERM /THURSDAY THROUGH SATURDAY/...
ISSUED AT 321 PM EDT WED MAR 12 2014
FORECAST CHALLENGES FOCUS ON PRECIP CHANCES WITH A WEAK FRONT LATE
FRIDAY...AND TEMPS THROUGHOUT THE FORECAST PERIOD.
THE FRENETIC PACE TO WEATHER ACROSS THE REGION AS OF LATE WILL
CONTINUE THROUGH THE PERIOD...WITH THIS BRIEF RETURN TO WINTER
FOLLOWED BY YET ANOTHER REMINDER BY FRIDAY THAT SPRING IS DEFINITELY
ON THE HORIZON. COLD BUT SUNNY START ON THURSDAY WITH HIGH PRESSURE
RIDGE OVER THE OHIO VALLEY. THE SURFACE RIDGE WILL SHIFT EAST
QUICKLY BY THURSDAY AFTERNOON WITH INCREASING LOW LEVEL WARM
ADVECTION COMMENCING BY LATE DAY...FOLLOWED BY THE PASSAGE OF A DRY
WARM FRONT THURSDAY NIGHT. EXPECT A PERIOD WITH INCREASED MID/HIGH
LEVEL CLOUDS THURSDAY AFTERNOON AND EVENING IMMEDIATELY AHEAD OF THE
WARM FRONT...WITH SKIES CLEARING OVERNIGHT.
RETURN OF RIDGING ALOFT ON FRIDAY AND SOUTHWEST FLOW AHEAD OF AN
APPROACHING WEAK COLD FRONT WILL SET THE STAGE FOR A MILD YET WINDY
DAY. LOW LEVEL JET WILL OVERSPREAD THE REGION BY FRIDAY AFTERNOON
AHEAD OF THE FRONT AND WITH MODEST MIXING LEVELS UP TO ABOUT
3KFT...SHOULD HAVE NO PROBLEM PULLING SOME STRONGER GUSTS TO
30-35MPH DOWN TO THE SURFACE. THE FRONT WILL INITIALLY BE LACKING
MOISTURE BUT AS IT MOVES INTO THE OHIO VALLEY FRIDAY EVENING...IT
WILL TAP INTO A SLIGHTLY BETTER FETCH OF GULF MOISTURE. COMBINED
WITH AN AXIS OF LOW LEVEL CONVERGENCE ALONG THE FRONT AND A BRIEF
YET SUBTLE PERIOD OF ISENTROPIC LIFT...EXPECT A FEW LIGHT RAIN
SHOWERS TO DEVELOP FRIDAY EVENING...SHIFTING SOUTH OF THE FORECAST
AREA PRIOR TO DAYBREAK SATURDAY. THE DEEPER MOISTURE DEPARTS AHEAD
OF THE COLDER AIR...SO ANTICIPATE PRECIP TO FALL ENTIRELY AS LIGHT
RAIN. WEAK HIGH PRESSURE WILL THEN REESTABLISH FOR SATURDAY WITH DRY
WEATHER AND SLIGHTLY COOLER TEMPS.
TEMPS...ARRIVAL OF WARM ADVECTION BY AFTERNOON SHOULD ENABLE A NICE
RECOVERY THURS WITH HIGHS INTO THE 30S. MAVMOS IN PARTICULAR APPEARS
TO BE A LITTLE TOO AGGRESSIVE WITH THE WARMUP...AND UNDERCUT BY A
FEW DEGREES IN GENERAL. FOLLOWED THE RECENT TREND OF GOING ABOVE MOS
FOR HIGHS FRIDAY AS COMBINATION OF WARM ADVECTION...SOUTHWEST FLOW
AND COMPRESSIONAL HEATING AHEAD OF THE FRONT WILL ALLOW TEMPS TO
APPROACH 60 ACROSS ALL BUT NORTHERN COUNTIES. MOS LOOKED REASONABLE
FOR HIGHS SATURDAY GENERALLY IN THE UPPER 40S AND 50S. BOUNDARY
LAYER THERMALS SUPPORTED MOS GUIDANCE FOR LOWS THROUGH THE PERIOD.
&&
.LONG TERM /SATURDAY NIGHT THROUGH WEDNESDAY/...
ISSUED AT 149 PM EDT WED MAR 12 2014
HIGH VARIABILITY AND LOW CONFIDENCE DURING THIS PERIOD AS MODELS
SUGGEST SEVERAL WEAKER SYSTEMS PASSING THROUGH THE AREA ALBEIT
WITH LIMITED MOISTURE. GFS PUSHES SOME UPPER SUPPORT AND A WEAK
TROUGH THROUGH THE AREA ON MONDAY...HOWEVER MOISTURE REMAINS
LIMITED AND CONFIDENCE IS LOW AS THE ECMWF PUSHES BETTER SUPPORT
THROUGH DEEP SOUTH.
A WARMING TREND IS NOTED THROUGH THE PERIOD AS STRONG WARM AIR
ADVECTION IS SEEN IN THE GFS ON TUE THROUGH WEDNESDAY. A THERMAL
RIDGE ACTUALLY BUILD ACROSS ILLINOIS AND INDIANA WITH 850MB TEMPS
RISING TOWARD 11C. THIS SHOULD PRODUCE SOME TEMPS AT OR ABOVE
NORMALS. HAVE INCLUDED A CHC FOR RAIN ON WEDNESDAY AS A GFS SUGGEST
A COLD FRONTAL PASSAGE...STILL VERY LOW CONFIDENCE.
&&
.AVIATION /DISCUSSION FOR THE 130000Z TAFS/...
ISSUED AT 646 PM EDT WED MAR 12 2014
HIGH PRESSURE WILL BUILD ACROSS THE AREA TONIGHT AND SUBSIDENCE
RETURNS. ASIDE FROM SOME LINGERING MFVR FOR SITES SUCH AS
KIND/KHUF/KLAF THROUGH 02Z...FORECAST SOUNDINGS INDICATE A DRY
COLUMN...THUS WILL TREND TOWARD VFR OVERNIGHT. SOME GOOD WARM AIR
ADVECTION IS EXPECTED ON THURSDAY AND THIS SHOULD RESULT IN SOME
MID TO HIGH CLOUDS ACROSS THE AREA....BUT STILL VFR CONDITIONS.
&&
.IND WATCHES/WARNINGS/ADVISORIES...
NONE.
&&
$$
SYNOPSIS...RYAN
NEAR TERM...RYAN/50
SHORT TERM...RYAN
LONG TERM....PUMA
AVIATION...SMF
VISIT US AT HTTP://WWW.WEATHER.GOV/IND
FOLLOW US ON TWITTER AND YOUTUBE AT:
WWW.TWITTER.COM/NWSINDIANAPOLIS
WWW.YOUTUBE.COM/NWSINDIANAPOLIS
AREA FORECAST DISCUSSION
NWS INDIANAPOLIS IN
649 PM EDT WED MAR 12 2014
.UPDATE...
THE AVIATION SECTION HAS BEEN UPDATED BELOW.
&&
.SYNOPSIS...
ISSUED AT 321 PM EDT WED MAR 12 2014
MUCH COLDER AIR WILL RETURN INTO THE REGION TONIGHT WITH HIGH
PRESSURE. THE CHILLY WEATHER WILL BE SHORT-LIVED...AS THE PASSAGE OF
A WARM FRONT THURSDAY NIGHT WILL USHER IN MILDER TEMPERATURES
FRIDAY. AFTER A WEAK COLD FRONT BRINGS A CHANCE FOR LIGHT RAIN
FRIDAY NIGHT...COOLER WEATHER WILL RETURN INTO EARLY NEXT WEEK.
&&
.NEAR TERM /TONIGHT/...
ISSUED AT 321 PM EDT WED MAR 12 2014
BACK EDGE OF THE LIGHT SNOW ASSOCIATED WITH THE LOW PRESSURE
MOVING ACROSS THE EASTERN HALF OF THE FORECAST AREA AS OF 19Z.
ANOTHER AREA OF WHAT APPEARS TO BE CONVECTIVE SNOW SHOWERS OVER
NORTHERN/CENTRAL ILLINOIS ASSOCIATED WITH AN UPPER LEVEL WAVE
CONTINUES TO MOVE SLOWLY SOUTHEAST. TEMPS HAVE BEEN GENERALLY
STEADY-STATE IN THE LOWER/MID 30S OVER THE LAST FEW HOURS.
WENT AHEAD AND DROPPED BOTH HEADLINES /WINTER WEATHER AND WIND
ADVISORIES/ AS SNOW HAS LIGHTENED CONSIDERABLY AND WIND GUSTS HAVE
DROPPED BELOW 40MPH. ADDITIONALLY...WITH A GENERALLY HEAVY WET SNOW
IN THE LOCATIONS WHERE SOME ACCUMULATION WAS EXPERIENCED...THE
BLOWING SNOW CONCERNS HAVE BEEN GREATLY DIMINISHED.
INITIAL ISSUE FOCUSES ON THE AREA OF SNOW OVER ILLINOIS. MOST SHORT
RANGE MODEL GUIDANCE STRUGGLING WITH THIS...BUT HRRR HINTS AT
BRINGING THE AXIS OF SNOW ACROSS THE LOWER WABASH VALLEY INTO THE
EVENING. ADDITIONALLY...RAP SOUNDINGS SHOWING SUBTLE INSTABILITY
PRESENT FOR THE NEXT FEW HOURS. WILL PUT LOW CHANCE POPS IN THROUGH
MID EVENING FROM TERRE HAUTE TO WASHINGTON AND POINTS WEST. EVEN
THOUGH MAY HAVE BRIEF BURSTS OF HEAVIER SNOW SHOWERS WITHIN
CONVECTION...SURFACE/GROUND TEMPS ARE ABOVE FREEZING AND EXPECT
IMPACTS TO BE MINIMAL.
REMAINDER OF THE FORECAST IS QUIET FOR TONIGHT AS WEAK HIGH PRESSURE
BUILDS IN OVERNIGHT. EXPECT SKIES TO BECOME CLEAR TONIGHT WITH WIND
GUSTS DIMINISHING DURING THE EVENING AS THE SURFACE PRESSURE
GRADIENT RELAXES.
TEMPS...COLD NIGHT BY MARCH STANDARDS AS CLEAR SKIES WITH A FRESH
SNOWPACK OVER NORTHERN COUNTIES SHOULD ENABLE TEMPS TO TUMBLE INTO
THE SINGLE DIGITS. EVEN FOR THE REMAINDER OF THE FORECAST AREA THAT
IS FREE OF SNOW COVER...EXPECT TEMPS TO BOTTOM OUT IN THE TEENS.
GENERALLY WENT WITH WARMER MAVMOS IN SNOW-FREE AREAS...AND MUCH
CLOSER TO COLDER METMOS OVER NORTHERN COUNTIES.
&&
.SHORT TERM /THURSDAY THROUGH SATURDAY/...
ISSUED AT 321 PM EDT WED MAR 12 2014
FORECAST CHALLENGES FOCUS ON PRECIP CHANCES WITH A WEAK FRONT LATE
FRIDAY...AND TEMPS THROUGHOUT THE FORECAST PERIOD.
THE FRENETIC PACE TO WEATHER ACROSS THE REGION AS OF LATE WILL
CONTINUE THROUGH THE PERIOD...WITH THIS BRIEF RETURN TO WINTER
FOLLOWED BY YET ANOTHER REMINDER BY FRIDAY THAT SPRING IS DEFINITELY
ON THE HORIZON. COLD BUT SUNNY START ON THURSDAY WITH HIGH PRESSURE
RIDGE OVER THE OHIO VALLEY. THE SURFACE RIDGE WILL SHIFT EAST
QUICKLY BY THURSDAY AFTERNOON WITH INCREASING LOW LEVEL WARM
ADVECTION COMMENCING BY LATE DAY...FOLLOWED BY THE PASSAGE OF A DRY
WARM FRONT THURSDAY NIGHT. EXPECT A PERIOD WITH INCREASED MID/HIGH
LEVEL CLOUDS THURSDAY AFTERNOON AND EVENING IMMEDIATELY AHEAD OF THE
WARM FRONT...WITH SKIES CLEARING OVERNIGHT.
RETURN OF RIDGING ALOFT ON FRIDAY AND SOUTHWEST FLOW AHEAD OF AN
APPROACHING WEAK COLD FRONT WILL SET THE STAGE FOR A MILD YET WINDY
DAY. LOW LEVEL JET WILL OVERSPREAD THE REGION BY FRIDAY AFTERNOON
AHEAD OF THE FRONT AND WITH MODEST MIXING LEVELS UP TO ABOUT
3KFT...SHOULD HAVE NO PROBLEM PULLING SOME STRONGER GUSTS TO
30-35MPH DOWN TO THE SURFACE. THE FRONT WILL INITIALLY BE LACKING
MOISTURE BUT AS IT MOVES INTO THE OHIO VALLEY FRIDAY EVENING...IT
WILL TAP INTO A SLIGHTLY BETTER FETCH OF GULF MOISTURE. COMBINED
WITH AN AXIS OF LOW LEVEL CONVERGENCE ALONG THE FRONT AND A BRIEF
YET SUBTLE PERIOD OF ISENTROPIC LIFT...EXPECT A FEW LIGHT RAIN
SHOWERS TO DEVELOP FRIDAY EVENING...SHIFTING SOUTH OF THE FORECAST
AREA PRIOR TO DAYBREAK SATURDAY. THE DEEPER MOISTURE DEPARTS AHEAD
OF THE COLDER AIR...SO ANTICIPATE PRECIP TO FALL ENTIRELY AS LIGHT
RAIN. WEAK HIGH PRESSURE WILL THEN REESTABLISH FOR SATURDAY WITH DRY
WEATHER AND SLIGHTLY COOLER TEMPS.
TEMPS...ARRIVAL OF WARM ADVECTION BY AFTERNOON SHOULD ENABLE A NICE
RECOVERY THURS WITH HIGHS INTO THE 30S. MAVMOS IN PARTICULAR APPEARS
TO BE A LITTLE TOO AGGRESSIVE WITH THE WARMUP...AND UNDERCUT BY A
FEW DEGREES IN GENERAL. FOLLOWED THE RECENT TREND OF GOING ABOVE MOS
FOR HIGHS FRIDAY AS COMBINATION OF WARM ADVECTION...SOUTHWEST FLOW
AND COMPRESSIONAL HEATING AHEAD OF THE FRONT WILL ALLOW TEMPS TO
APPROACH 60 ACROSS ALL BUT NORTHERN COUNTIES. MOS LOOKED REASONABLE
FOR HIGHS SATURDAY GENERALLY IN THE UPPER 40S AND 50S. BOUNDARY
LAYER THERMALS SUPPORTED MOS GUIDANCE FOR LOWS THROUGH THE PERIOD.
&&
.LONG TERM /SATURDAY NIGHT THROUGH WEDNESDAY/...
ISSUED AT 149 PM EDT WED MAR 12 2014
HIGH VARIABILITY AND LOW CONFIDENCE DURING THIS PERIOD AS MODELS
SUGGEST SEVERAL WEAKER SYSTEMS PASSING THROUGH THE AREA ALBEIT
WITH LIMITED MOISTURE. GFS PUSHES SOME UPPER SUPPORT AND A WEAK
TROUGH THROUGH THE AREA ON MONDAY...HOWEVER MOISTURE REMAINS
LIMITED AND CONFIDENCE IS LOW AS THE ECMWF PUSHES BETTER SUPPORT
THROUGH DEEP SOUTH.
A WARMING TREND IS NOTED THROUGH THE PERIOD AS STRONG WARM AIR
ADVECTION IS SEEN IN THE GFS ON TUE THROUGH WEDNESDAY. A THERMAL
RIDGE ACTUALLY BUILD ACROSS ILLINOIS AND INDIANA WITH 850MB TEMPS
RISING TOWARD 11C. THIS SHOULD PRODUCE SOME TEMPS AT OR ABOVE NORMALS.
HAVE INCLUDED A CHC FOR RAIN ON WEDNESDAY AS A GFS SUGGEST A COLD
FRONTAL PASSAGE...STILL VERY LOW CONFIDENCE.
&&
.AVIATION /DISCUSSION FOR THE 130000Z TAFS/...
ISSUED AT 646 PM EDT WED MAR 12 2014
HIGH PRESSURE WILL BUILD ACROSS THE AREA TONIGHT AND SUBSIDENCE
RETURNS. ASIDE FROM SOME LINGERING MFVR FOR SITES SUCH AS
KIND/KHUF/KLAF THROUGH 02Z...FORECAST SOUNDINGS INDICATE A DRY
COLUMN...THUS WILL TREND TOWARD VFR OVERNIGHT. SOME GOOD WARM AIR
ADVECTION IS EXPECTED ON THURSDAY AND THIS SHOULD RESULT IN SOME
MID TO HIGH CLOUDS ACROSS THE AREA....BUT STILL VFR CONDITIONS.
&&
.IND WATCHES/WARNINGS/ADVISORIES...
NONE.
&&
$$
SYNOPSIS...RYAN
NEAR TERM...RYAN
SHORT TERM...RYAN
LONG TERM....PUMA
AVIATION...SMF
VISIT US AT HTTP://WWW.WEATHER.GOV/IND
FOLLOW US ON TWITTER AND YOUTUBE AT:
WWW.TWITTER.COM/NWSINDIANAPOLIS
WWW.YOUTUBE.COM/NWSINDIANAPOLIS
AREA FORECAST DISCUSSION
NWS INDIANAPOLIS IN
422 PM EDT WED MAR 12 2014
.UPDATE...
THE AVIATION SECTION HAS BEEN UPDATED BELOW.
&&
.SYNOPSIS...
ISSUED AT 321 PM EDT WED MAR 12 2014
MUCH COLDER AIR WILL RETURN INTO THE REGION TONIGHT WITH HIGH
PRESSURE. THE CHILLY WEATHER WILL BE SHORT-LIVED...AS THE PASSAGE OF
A WARM FRONT THURSDAY NIGHT WILL USHER IN MILDER TEMPERATURES
FRIDAY. AFTER A WEAK COLD FRONT BRINGS A CHANCE FOR LIGHT RAIN
FRIDAY NIGHT...COOLER WEATHER WILL RETURN INTO EARLY NEXT WEEK.
&&
.NEAR TERM /TONIGHT/...
ISSUED AT 321 PM EDT WED MAR 12 2014
BACK EDGE OF THE LIGHT SNOW ASSOCIATED WITH THE LOW PRESSURE
MOVING ACROSS THE EASTERN HALF OF THE FORECAST AREA AS OF 19Z.
ANOTHER AREA OF WHAT APPEARS TO BE CONVECTIVE SNOW SHOWERS OVER
NORTHERN/CENTRAL ILLINOIS ASSOCIATED WITH AN UPPER LEVEL WAVE
CONTINUES TO MOVE SLOWLY SOUTHEAST. TEMPS HAVE BEEN GENERALLY
STEADY-STATE IN THE LOWER/MID 30S OVER THE LAST FEW HOURS.
WENT AHEAD AND DROPPED BOTH HEADLINES /WINTER WEATHER AND WIND
ADVISORIES/ AS SNOW HAS LIGHTENED CONSIDERABLY AND WIND GUSTS HAVE
DROPPED BELOW 40MPH. ADDITIONALLY...WITH A GENERALLY HEAVY WET SNOW
IN THE LOCATIONS WHERE SOME ACCUMULATION WAS EXPERIENCED...THE
BLOWING SNOW CONCERNS HAVE BEEN GREATLY DIMINISHED.
INITIAL ISSUE FOCUSES ON THE AREA OF SNOW OVER ILLINOIS. MOST SHORT
RANGE MODEL GUIDANCE STRUGGLING WITH THIS...BUT HRRR HINTS AT
BRINGING THE AXIS OF SNOW ACROSS THE LOWER WABASH VALLEY INTO THE
EVENING. ADDITIONALLY...RAP SOUNDINGS SHOWING SUBTLE INSTABILITY
PRESENT FOR THE NEXT FEW HOURS. WILL PUT LOW CHANCE POPS IN THROUGH
MID EVENING FROM TERRE HAUTE TO WASHINGTON AND POINTS WEST. EVEN
THOUGH MAY HAVE BRIEF BURSTS OF HEAVIER SNOW SHOWERS WITHIN
CONVECTION...SURFACE/GROUND TEMPS ARE ABOVE FREEZING AND EXPECT
IMPACTS TO BE MINIMAL.
REMAINDER OF THE FORECAST IS QUIET FOR TONIGHT AS WEAK HIGH PRESSURE
BUILDS IN OVERNIGHT. EXPECT SKIES TO BECOME CLEAR TONIGHT WITH WIND
GUSTS DIMINISHING DURING THE EVENING AS THE SURFACE PRESSURE
GRADIENT RELAXES.
TEMPS...COLD NIGHT BY MARCH STANDARDS AS CLEAR SKIES WITH A FRESH
SNOWPACK OVER NORTHERN COUNTIES SHOULD ENABLE TEMPS TO TUMBLE INTO
THE SINGLE DIGITS. EVEN FOR THE REMAINDER OF THE FORECAST AREA THAT
IS FREE OF SNOW COVER...EXPECT TEMPS TO BOTTOM OUT IN THE TEENS.
GENERALLY WENT WITH WARMER MAVMOS IN SNOW-FREE AREAS...AND MUCH
CLOSER TO COLDER METMOS OVER NORTHERN COUNTIES.
&&
.SHORT TERM /THURSDAY THROUGH SATURDAY/...
ISSUED AT 321 PM EDT WED MAR 12 2014
FORECAST CHALLENGES FOCUS ON PRECIP CHANCES WITH A WEAK FRONT LATE
FRIDAY...AND TEMPS THROUGHOUT THE FORECAST PERIOD.
THE FRENETIC PACE TO WEATHER ACROSS THE REGION AS OF LATE WILL
CONTINUE THROUGH THE PERIOD...WITH THIS BRIEF RETURN TO WINTER
FOLLOWED BY YET ANOTHER REMINDER BY FRIDAY THAT SPRING IS DEFINITELY
ON THE HORIZON. COLD BUT SUNNY START ON THURSDAY WITH HIGH PRESSURE
RIDGE OVER THE OHIO VALLEY. THE SURFACE RIDGE WILL SHIFT EAST
QUICKLY BY THURSDAY AFTERNOON WITH INCREASING LOW LEVEL WARM
ADVECTION COMMENCING BY LATE DAY...FOLLOWED BY THE PASSAGE OF A DRY
WARM FRONT THURSDAY NIGHT. EXPECT A PERIOD WITH INCREASED MID/HIGH
LEVEL CLOUDS THURSDAY AFTERNOON AND EVENING IMMEDIATELY AHEAD OF THE
WARM FRONT...WITH SKIES CLEARING OVERNIGHT.
RETURN OF RIDGING ALOFT ON FRIDAY AND SOUTHWEST FLOW AHEAD OF AN
APPROACHING WEAK COLD FRONT WILL SET THE STAGE FOR A MILD YET WINDY
DAY. LOW LEVEL JET WILL OVERSPREAD THE REGION BY FRIDAY AFTERNOON
AHEAD OF THE FRONT AND WITH MODEST MIXING LEVELS UP TO ABOUT
3KFT...SHOULD HAVE NO PROBLEM PULLING SOME STRONGER GUSTS TO
30-35MPH DOWN TO THE SURFACE. THE FRONT WILL INITIALLY BE LACKING
MOISTURE BUT AS IT MOVES INTO THE OHIO VALLEY FRIDAY EVENING...IT
WILL TAP INTO A SLIGHTLY BETTER FETCH OF GULF MOISTURE. COMBINED
WITH AN AXIS OF LOW LEVEL CONVERGENCE ALONG THE FRONT AND A BRIEF
YET SUBTLE PERIOD OF ISENTROPIC LIFT...EXPECT A FEW LIGHT RAIN
SHOWERS TO DEVELOP FRIDAY EVENING...SHIFTING SOUTH OF THE FORECAST
AREA PRIOR TO DAYBREAK SATURDAY. THE DEEPER MOISTURE DEPARTS AHEAD
OF THE COLDER AIR...SO ANTICIPATE PRECIP TO FALL ENTIRELY AS LIGHT
RAIN. WEAK HIGH PRESSURE WILL THEN REESTABLISH FOR SATURDAY WITH DRY
WEATHER AND SLIGHTLY COOLER TEMPS.
TEMPS...ARRIVAL OF WARM ADVECTION BY AFTERNOON SHOULD ENABLE A NICE
RECOVERY THURS WITH HIGHS INTO THE 30S. MAVMOS IN PARTICULAR APPEARS
TO BE A LITTLE TOO AGGRESSIVE WITH THE WARMUP...AND UNDERCUT BY A
FEW DEGREES IN GENERAL. FOLLOWED THE RECENT TREND OF GOING ABOVE MOS
FOR HIGHS FRIDAY AS COMBINATION OF WARM ADVECTION...SOUTHWEST FLOW
AND COMPRESSIONAL HEATING AHEAD OF THE FRONT WILL ALLOW TEMPS TO
APPROACH 60 ACROSS ALL BUT NORTHERN COUNTIES. MOS LOOKED REASONABLE
FOR HIGHS SATURDAY GENERALLY IN THE UPPER 40S AND 50S. BOUNDARY
LAYER THERMALS SUPPORTED MOS GUIDANCE FOR LOWS THROUGH THE PERIOD.
&&
.LONG TERM /SATURDAY NIGHT THROUGH WEDNESDAY/...
ISSUED AT 149 PM EDT WED MAR 12 2014
HIGH VARIABILITY AND LOW CONFIDENCE DURING THIS PERIOD AS MODELS
SUGGEST SEVERAL WEAKER SYSTEMS PASSING THROUGH THE AREA ALBEIT
WITH LIMITED MOISTURE. GFS PUSHES SOME UPPER SUPPORT AND A WEAK
TROUGH THROUGH THE AREA ON MONDAY...HOWEVER MOISTURE REMAINS
LIMITED AND CONFIDENCE IS LOW AS THE ECMWF PUSHES BETTER SUPPORT
THROUGH DEEP SOUTH.
A WARMING TREND IS NOTED THROUGH THE PERIOD AS STRONG WARM AIR
ADVECTION IS SEEN IN THE GFS ON TUE THROUGH WEDNESDAY. A THERMAL
RIDGE ACTUALLY BUILD ACROSS ILLINOIS AND INDIANA WITH 850MB TEMPS
RISING TOWARD 11C. THIS SHOULD PRODUCE SOME TEMPS AT OR ABOVE NORMALS.
HAVE INCLUDED A CHC FOR RAIN ON WEDNESDAY AS A GFS SUGGEST A COLD
FRONTAL PASSAGE...STILL VERY LOW CONFIDENCE.
&&
.AVIATION /DISCUSSION FOR THE 121800Z TAFS/...
ISSUED AT 419 PM EDT WED MAR 12 2014
2020Z UPDATE...KIND IS CURRENTLY VFR AND TRENDS ARE FOR THIS TO
BECOME PREDOMINATE OVER THE NEXT FEW HOURS. HOWEVER SOME MFVR
CLOUDS MAY CONTINUE TO DRIFT THROUGH BEFORE 00Z SO A BKN DECK
AROUND 025 WAS TEMPO/D IN FOR THE NEXT FEW HOURS. OTHER TAFS LOOK
GOOD. NO OTHER CHANGES NEEDED AT THIS TIME. PREVIOUS DISCUSSION
FOLLOWS.
RADAR RETURNS OVER THE AREA SHOW RETURNS DIMINISHING AND QUICKLY
MOVING EAST...EXITING THE AREA. AS SNOW WAS EXITING CEILINGS WERE
BECOMING MVFR. THUS AS THE BACK EDGE OF THE CLOUD SHIELD WITH THE
DEPARTING LOW PASSES ACROSS THE AREA...EXPECT MVFR CEILINGS TO
PERSIST THE NEXT 6 HOURS.
HIGH PRESSURE IS THEN EXPECTED TO BUILD ACROSS THE AREA TONIGHT
AND SUBSIDENCE RETURNS. FORECAST SOUNDINGS INDICATE A DRY
COLUMN...THUS WILL TREND TOWARD VFR OVERNIGHT.
SOME GOOD WARM AIR ADVECTION IS EXPECTED ON THURSDAY AND THIS
SHOULD RESULT IN SOME HIGH CLOUDS ACROSS THE AREA....BUT STILL
VFR CONDITIONS.
&&
.IND WATCHES/WARNINGS/ADVISORIES...
NONE.
&&
$$
SYNOPSIS...RYAN
NEAR TERM...RYAN
SHORT TERM...RYAN
LONG TERM....PUMA
AVIATION...SMF
VISIT US AT HTTP://WWW.WEATHER.GOV/IND
FOLLOW US ON TWITTER AND YOUTUBE AT:
WWW.TWITTER.COM/NWSINDIANAPOLIS
WWW.YOUTUBE.COM/NWSINDIANAPOLIS
AREA FORECAST DISCUSSION
NWS INDIANAPOLIS IN
321 PM EDT WED MAR 12 2014
.UPDATE...
THE SYNOPSIS...NEAR TERM AND SHORT TERM SECTIONS HAVE BEEN UPDATED
BELOW.
&&
.SYNOPSIS...
ISSUED AT 321 PM EDT WED MAR 12 2014
MUCH COLDER AIR WILL RETURN INTO THE REGION TONIGHT WITH HIGH
PRESSURE. THE CHILLY WEATHER WILL BE SHORT-LIVED...AS THE PASSAGE OF
A WARM FRONT THURSDAY NIGHT WILL USHER IN MILDER TEMPERATURES
FRIDAY. AFTER A WEAK COLD FRONT BRINGS A CHANCE FOR LIGHT RAIN
FRIDAY NIGHT...COOLER WEATHER WILL RETURN INTO EARLY NEXT WEEK.
&&
.NEAR TERM /TONIGHT/...
ISSUED AT 321 PM EDT WED MAR 12 2014
BACK EDGE OF THE LIGHT SNOW ASSOCIATED WITH THE LOW PRESSURE
MOVING ACROSS THE EASTERN HALF OF THE FORECAST AREA AS OF 19Z.
ANOTHER AREA OF WHAT APPEARS TO BE CONVECTIVE SNOW SHOWERS OVER
NORTHERN/CENTRAL ILLINOIS ASSOCIATED WITH AN UPPER LEVEL WAVE
CONTINUES TO MOVE SLOWLY SOUTHEAST. TEMPS HAVE BEEN GENERALLY
STEADY-STATE IN THE LOWER/MID 30S OVER THE LAST FEW HOURS.
WENT AHEAD AND DROPPED BOTH HEADLINES /WINTER WEATHER AND WIND
ADVISORIES/ AS SNOW HAS LIGHTENED CONSIDERABLY AND WIND GUSTS HAVE
DROPPED BELOW 40MPH. ADDITIONALLY...WITH A GENERALLY HEAVY WET SNOW
IN THE LOCATIONS WHERE SOME ACCUMULATION WAS EXPERIENCED...THE
BLOWING SNOW CONCERNS HAVE BEEN GREATLY DIMINISHED.
INITIAL ISSUE FOCUSES ON THE AREA OF SNOW OVER ILLINOIS. MOST SHORT
RANGE MODEL GUIDANCE STRUGGLING WITH THIS...BUT HRRR HINTS AT
BRINGING THE AXIS OF SNOW ACROSS THE LOWER WABASH VALLEY INTO THE
EVENING. ADDITIONALLY...RAP SOUNDINGS SHOWING SUBTLE INSTABILITY
PRESENT FOR THE NEXT FEW HOURS. WILL PUT LOW CHANCE POPS IN THROUGH
MID EVENING FROM TERRE HAUTE TO WASHINGTON AND POINTS WEST. EVEN
THOUGH MAY HAVE BRIEF BURSTS OF HEAVIER SNOW SHOWERS WITHIN
CONVECTION...SURFACE/GROUND TEMPS ARE ABOVE FREEZING AND EXPECT
IMPACTS TO BE MINIMAL.
REMAINDER OF THE FORECAST IS QUIET FOR TONIGHT AS WEAK HIGH PRESSURE
BUILDS IN OVERNIGHT. EXPECT SKIES TO BECOME CLEAR TONIGHT WITH WIND
GUSTS DIMINISHING DURING THE EVENING AS THE SURFACE PRESSURE
GRADIENT RELAXES.
TEMPS...COLD NIGHT BY MARCH STANDARDS AS CLEAR SKIES WITH A FRESH
SNOWPACK OVER NORTHERN COUNTIES SHOULD ENABLE TEMPS TO TUMBLE INTO
THE SINGLE DIGITS. EVEN FOR THE REMAINDER OF THE FORECAST AREA THAT
IS FREE OF SNOW COVER...EXPECT TEMPS TO BOTTOM OUT IN THE TEENS.
GENERALLY WENT WITH WARMER MAVMOS IN SNOW-FREE AREAS...AND MUCH
CLOSER TO COLDER METMOS OVER NORTHERN COUNTIES.
&&
.SHORT TERM /THURSDAY THROUGH SATURDAY/...
ISSUED AT 321 PM EDT WED MAR 12 2014
FORECAST CHALLENGES FOCUS ON PRECIP CHANCES WITH A WEAK FRONT LATE
FRIDAY...AND TEMPS THROUGHOUT THE FORECAST PERIOD.
THE FRENETIC PACE TO WEATHER ACROSS THE REGION AS OF LATE WILL
CONTINUE THROUGH THE PERIOD...WITH THIS BRIEF RETURN TO WINTER
FOLLOWED BY YET ANOTHER REMINDER BY FRIDAY THAT SPRING IS DEFINITELY
ON THE HORIZON. COLD BUT SUNNY START ON THURSDAY WITH HIGH PRESSURE
RIDGE OVER THE OHIO VALLEY. THE SURFACE RIDGE WILL SHIFT EAST
QUICKLY BY THURSDAY AFTERNOON WITH INCREASING LOW LEVEL WARM
ADVECTION COMMENCING BY LATE DAY...FOLLOWED BY THE PASSAGE OF A DRY
WARM FRONT THURSDAY NIGHT. EXPECT A PERIOD WITH INCREASED MID/HIGH
LEVEL CLOUDS THURSDAY AFTERNOON AND EVENING IMMEDIATELY AHEAD OF THE
WARM FRONT...WITH SKIES CLEARING OVERNIGHT.
RETURN OF RIDGING ALOFT ON FRIDAY AND SOUTHWEST FLOW AHEAD OF AN
APPROACHING WEAK COLD FRONT WILL SET THE STAGE FOR A MILD YET WINDY
DAY. LOW LEVEL JET WILL OVERSPREAD THE REGION BY FRIDAY AFTERNOON
AHEAD OF THE FRONT AND WITH MODEST MIXING LEVELS UP TO ABOUT
3KFT...SHOULD HAVE NO PROBLEM PULLING SOME STRONGER GUSTS TO
30-35MPH DOWN TO THE SURFACE. THE FRONT WILL INITIALLY BE LACKING
MOISTURE BUT AS IT MOVES INTO THE OHIO VALLEY FRIDAY EVENING...IT
WILL TAP INTO A SLIGHTLY BETTER FETCH OF GULF MOISTURE. COMBINED
WITH AN AXIS OF LOW LEVEL CONVERGENCE ALONG THE FRONT AND A BRIEF
YET SUBTLE PERIOD OF ISENTROPIC LIFT...EXPECT A FEW LIGHT RAIN
SHOWERS TO DEVELOP FRIDAY EVENING...SHIFTING SOUTH OF THE FORECAST
AREA PRIOR TO DAYBREAK SATURDAY. THE DEEPER MOISTURE DEPARTS AHEAD
OF THE COLDER AIR...SO ANTICIPATE PRECIP TO FALL ENTIRELY AS LIGHT
RAIN. WEAK HIGH PRESSURE WILL THEN REESTABLISH FOR SATURDAY WITH DRY
WEATHER AND SLIGHTLY COOLER TEMPS.
TEMPS...ARRIVAL OF WARM ADVECTION BY AFTERNOON SHOULD ENABLE A NICE
RECOVERY THURS WITH HIGHS INTO THE 30S. MAVMOS IN PARTICULAR APPEARS
TO BE A LITTLE TOO AGGRESSIVE WITH THE WARMUP...AND UNDERCUT BY A
FEW DEGREES IN GENERAL. FOLLOWED THE RECENT TREND OF GOING ABOVE MOS
FOR HIGHS FRIDAY AS COMBINATION OF WARM ADVECTION...SOUTHWEST FLOW
AND COMPRESSIONAL HEATING AHEAD OF THE FRONT WILL ALLOW TEMPS TO
APPROACH 60 ACROSS ALL BUT NORTHERN COUNTIES. MOS LOOKED REASONABLE
FOR HIGHS SATURDAY GENERALLY IN THE UPPER 40S AND 50S. BOUNDARY
LAYER THERMALS SUPPORTED MOS GUIDANCE FOR LOWS THROUGH THE PERIOD.
&&
.LONG TERM /SATURDAY NIGHT THROUGH WEDNESDAY/...
ISSUED AT 149 PM EDT WED MAR 12 2014
HIGH VARIABILITY AND LOW CONFIDENCE DURING THIS PERIOD AS MODELS
SUGGEST SEVERAL WEAKER SYSTEMS PASSING THROUGH THE AREA ALBEIT
WITH LIMITED MOISTURE. GFS PUSHES SOME UPPER SUPPORT AND A WEAK
TROUGH THROUGH THE AREA ON MONDAY...HOWEVER MOISTURE REMAINS
LIMITED AND CONFIDENCE IS LOW AS THE ECMWF PUSHES BETTER SUPPORT
THROUGH DEEP SOUTH.
A WARMING TREND IS NOTED THROUGH THE PERIOD AS STRONG WARM AIR
ADVECTION IS SEEN IN THE GFS ON TUE THROUGH WEDNESDAY. A THERMAL
RIDGE ACTUALLY BUILD ACROSS ILLINOIS AND INDIANA WITH 850MB TEMPS
RISING TOWARD 11C. THIS SHOULD PRODUCE SOME TEMPS AT OR ABOVE NORMALS.
HAVE INCLUDED A CHC FOR RAIN ON WEDNESDAY AS A GFS SUGGEST A COLD
FRONTAL PASSAGE...STILL VERY LOW CONFIDENCE.
&&
.AVIATION /DISCUSSION FOR THE 121800Z TAFS/...
ISSUED AT 1250 PM EDT WED MAR 12 2014
RADAR RETURNS OVER THE AREA SHOW RETURNS DIMINISHING AND QUICKLY
MOVING EAST...EXITING THE AREA. AS SNOW WAS EXITING CEILINGS WERE
BECOMING MVFR. THUS AS THE BACK EDGE OF THE CLOUD SHIELD WITH THE
DEPARTING LOW PASSES ACROSS THE AREA...EXPECT MVFR CEILINGS TO
PERSIST THE NEXT 6 HOURS.
HIGH PRESSURE IS THEN EXPECTED TO BUILD ACROSS THE AREA TONIGHT
AND SUBSIDENCE RETURNS. FORECAST SOUNDINGS INDICATE A DRY
COLUMN...THUS WILL TREND TOWARD VFR OVERNIGHT.
SOME GOOD WARM AIR ADVECTION IS EXPECTED ON THURSDAY AND THIS
SHOULD RESULT IN SOME HIGH CLOUDS ACROSS THE AREA....BUT STILL
VFR CONDITIONS.
&&
.IND WATCHES/WARNINGS/ADVISORIES...NONE.
&&
$$
SYNOPSIS...RYAN
NEAR TERM...RYAN
SHORT TERM...RYAN
LONG TERM....PUMA
AVIATION...JP
VISIT US AT HTTP://WWW.WEATHER.GOV/IND
FOLLOW US ON TWITTER AND YOUTUBE AT:
WWW.TWITTER.COM/NWSINDIANAPOLIS
WWW.YOUTUBE.COM/NWSINDIANAPOLIS
AREA FORECAST DISCUSSION
NWS DODGE CITY KS
711 PM CDT Thu Mar 13 2014
...Update to update...
.UPDATE...
ISSUED AT 711 PM CDT THU MAR 13 2014
Allowed the red flag warning to expire at 00Z. Marginal conditions
expected between 7 pm and 8 pm. HRRR shows winds weakening considerably
within the next hour.
&&
.SHORT TERM...(This evening through Friday)
ISSUED AT 130 PM CDT THU MAR 13 2014
Gusty south to southwest had developed earlier this afternoon as
a surface trough of low pressure deepens along the lee of the
Rockies. If not already these winds will range from 15 to 25 mph
range by late day. In addition relative humidities will range from
10 to 15 percent. Current red flag warning still look on track so
will continue this warning through 7 pm.
An upper level disturbance, which was located over northern Idaho
at 12z Thursday, will move out of the Rockies and out into the
Western High Plains early tonight. As this system crosses into the
the High Plains a surface trough of low pressure will move east
across western Kansas and a cold front will move south across
Nebraska. The winds across western Kansas will decrease to around
10kts and veer to the west northwest as this surface boundary
passes early this evening. Gusty North winds will then develop
during the early morning hours as a cold front moves across
western Kansas. Skies early tonight will be mostly clear, however
after midnight mid to high level moisture will begin to increase
across western Kansas. Given clear skies early along with a period
of decreasing winds have favored the new, slightly cooler, MAV/MET
guidance. Lows tonight are expected to range from the lower 30s in
west central Kansas to near 40 in south central Kansas.
High pressure a the surface will build into western Kansas by
Friday afternoon and 850mb temperatures are expected to cool into
the 5c to near 8c range by 00z Saturday. 12z NAM and 12z GFS were
both in decent agreement with increasing moisture in the 600mb to
400mb level during the early morning hours as a 500mb deformation
zone moves slowly into southwest Kansas. Based on the expected
cloud cover early Friday and 850mb temperatures at 00z Saturday
will trend highs Friday afternoon towards what the cooler 850mb
mix down temperature which suggested highs will range from the
upper 50s in west central Kansas to the mid 60s near the Oklahoma
border in south central Kansas.
.LONG TERM...(Friday night through Thursday)
ISSUED AT 322 PM CDT THU MAR 13 2014
At this time the weekend precipitation chances appear most likely
across the Colorado line and through south central Kansas. Models
continue to indicate as upper PV anomaly diving just south of
western Kansas Saturday night, with a broad PVA and weak mid level
frontogenetic zone extending into western Kansas just ahead of a
moderate intensity cold frontal boundary for Saturday night. Ahead
of the boundary a narrow corridor of enhanced MUCapes on the order
of a couple of hundred J/kg will develop in the afternoon, but not
necessarily coincident with the best frontogenesis. Nevertheless,
isolated thunderstorms were also added to the rain chances (mainly
south of a Ulysses to Pratt line) beginning in the afternoon and
extending into the very early evening Saturday. A deepening colder
airmass spreading from the higher terrain will promote a
precipitation phase change to snow with time, but as the colder
air arrives, any real lifting mechanism appears to be minimized
with time as deep northwest flow begins to become established. The
models indicate continued breezy if not implied windy conditions
on Sunday as the upper low drops into eastern Texas. A slow
warming trend through Monday may only be temporary as the models
indicate yet another sharp wave diving through the westerly flow
by Tuesday night.
&&
.AVIATION...(For the 00Z TAFS through 00Z Friday evening)
ISSUED AT 600 PM CDT THU MAR 13 2014
VFR conditions expected through TAF pd. Some mid to high level clouds,
but no operational/flight impacts. A sfc trof/weak front moves through
the region through the overnight with winds veering SW to NW/N. Magnitudes
15-22 kt this early evening becoming 11-18 kt tomorrow morning.
&&
.PRELIMINARY POINT TEMPS/POPS...
DDC 37 61 36 63 / 0 10 0 20
GCK 36 60 34 62 / 0 10 0 30
EHA 40 59 36 62 / 0 10 0 40
LBL 38 60 35 63 / 0 10 0 30
HYS 37 61 35 62 / 0 0 0 20
P28 41 65 37 64 / 0 10 0 20
&&
.DDC WATCHES/WARNINGS/ADVISORIES...
NONE.
&&
$$
UPDATE...Sugden
SHORT TERM...Burgert
LONG TERM...Russell
AVIATION...Sugden
AREA FORECAST DISCUSSION
NWS TOPEKA KS
1159 PM CDT Tue Mar 11 2014
...Update to aviation forecast discussion...
.SHORT TERM...(This Evening through Tonight)
Issued at 322 PM CDT TUE MAR 11 2014
Late this afternoon, surface boundary bisects the CWA stretching
just west of Wichita to the northeast to Topeka and further east
north of KM CI. Several convergence zones ahead this boundary, with
strongest axis stretching along the I-35/335 corridor. Will need to
watch for potential development of convection along this corridor
through 6pm as primary cold front moves east. Instability along and
head of this front remains meager, with RAP analysis only indicating
CAPE values 100-300 J/KG. If storms would happen to develop, the
main impact would be small hail with the longevity of convection
in the CWA minimal.
The other concern heading into the overnight hours will be strong
gradient winds. We`re already seeing advisory level winds in the
far NW portion of the CWA at this hour, and as the surface boundary
settles southeast, these strong gradient winds will swing through
the CWA. By midnight, sfc pressure gradient should begin to weaken
as the developing sfc low moves through the MO bootheel.
The shortwave responsible for these strong winds and increasing
precipitation chances is just beginning to enter the Western Plains
this afternoon. A linear band of mid-level frontogenesis across
NE/IA slopes back to western KS at 3pm. Short term model guidance
continues to suggest that this band will slowly move southeast this
evening. While the western flank of the mid-level lift should hold
together the further southeast it tracks, the eastern areas of
precip across NE/IA will dissipate as a new baroclinic zone is
reestablished further south across eastern KS and northern
Missouri. Precipitation should blossom shortly after 00Z along the
eastern edges of the CWA. Given the position of the shortwave and
how the wave pivots eastward, the majority of the heavy
precipitation should take place just east of the CWA. Latest
hopWRF, HRRR, RAP support the idea of a brief window of 3-5 hrs of a
rain/snow mixture bisecting the CWA with most of the activity
diminishing or moving east by 1am. Accumulations should remain light
given the warm grounds, but could see up to an inch of snow in some
spots where efficient rates can overtake boundary layer temps.
.LONG TERM...(Wednesday Night through Tuesday)
Issued at 322 PM CDT TUE MAR 11 2014
After the past two days, Wednesday will feel
chilly with temperatures rebounding into the upper 40s to lower
50s. Will watch for an increase in low-level clouds late morning,
as a secondary wave rotates southward into the area. A quick rebound
above normal is expected by Thursday and Friday ahead of yet another
shortwave pivoting through the southern Rockies. Temperatures on
Thursday will rebound into the 60s, with a front dropping southward
on Friday lowering readings a few degrees.
Saturday-Monday: The aforementioned shortwave should pass far enough
to the south Friday night to have minimal impact on the CWA leaving
conditions pleasant for Saturday. A slightly more amplified flow
pattern will drop colder air southward again on Sunday, but this
cooldown should last no longer than a day as increasing
southwesterly flow ushers above normal temperatures into the region
to begin next week. Have bumped up temperatures for Monday.
&&
.AVIATION...(For the 06Z TAFs through 06Z Wednesday Night)
Issued at 1141 PM CDT TUE MAR 11 2014
Kept mention of light rain/snow mix at TOP and FOE for another
hour as last band progged to pass through in that timeframe. Low
cigs also move out quickly and brought vfr back to sites by 07z as
well. Winds remain northwest with some gusts overnight but can
likely be diminished and backed with the next taf issuance late in
the forecast period.
&&
.TOP WATCHES/WARNINGS/ADVISORIES...
WIND ADVISORY until 1 AM CDT Wednesday FOR KSZ011-012-022>024-
026-036>040-054>056-058-059.
&&
$$
SHORT TERM...DUX
LONG TERM...DUX
AVIATION...67
AREA FORECAST DISCUSSION...UPDATED
NWS JACKSON KY
325 PM EDT WED MAR 12 2014
.SHORT TERM...(THIS EVENING THROUGH THURSDAY NIGHT)
ISSUED AT 315 PM EDT WED MAR 12 2014
18Z SFC ANALYSIS SHOWS THE DEEP LOW NOW OVER SOUTHWESTERN
PENNSYLVANIA WITH ITS COLD FRONT EAST OF KENTUCKY. THIS FRONT WAS
ACCOMPANIED AND TRAILED BY THE HIGHEST WINDS OF THE DAY WITH MANY
GUSTS TO 45 AND 50 MPH REPORTED IN ADDITION TO A 54 MPH GUST AT THE
KNOTT COUNTY MESONET. THE WINDS WILL CONTINUE GUSTY INTO THE EVENING
AS THE COLD AIR CONTINUES TO POUR INTO THIS PART OF THE STATE. THESE
WINDS ARE BRINGING IN THE SOON TO BE SUB FREEZING AIR WITH MID 30S
ALREADY NOTED IN THE NORTHWEST PARTS OF THE AREA WHILE MID 40S HOLD
IN THE FAR EAST...THOUGH BLACK MOUNTAIN IS DOWN TO 38 DEGREES.
DEWPOINTS ARE IN THE LOWER 30S NORTH TO THE UPPER 30S ACROSS THE
SOUTHEAST.
THE UPSLOPE FLOW IS KICKING IN ACROSS THE AREA AND WE CAN SEE THE
RAIN SHOWERS REDEVELOPING THROUGH THE HEART OF THE CWA. SOME FLURRIES
HAVE BEEN REPORTED WITH THESE HERE AT JKL...AND ALSO IN OUR NORTHERN
FRINGES...ON TRACK WITH EXPECTATIONS AND TIMING FROM THE LATEST HRRR.
THIS MODEL ALSO HAS BETTER REDEVELOPMENT OF SNOW TOWARD DUSK. AFTER
REVIEWING THE LATEST MODEL GUIDANCE...AND IN PARTICULAR THE
HRRR...HAVE DECIDED TO HOIST A WINTER WEATHER ADVISORY FOR THREE OF
OUR NORTHERN BORDER COUNTIES WITH VIRGINIA FOR A 1 TO 2 INCH SNOWFALL
MAINLY AT ELEVATIONS ABOVE 2500 FEET.
THE MODELS ARE IN GOOD AGREEMENT ALOFT WITH THE DEEP LATE WINTER
TROUGH CROSSING THE OHIO VALLEY TONIGHT. THEY ALL HAVE ENERGY
WRAPPING IN HERE THROUGH 12Z THURSDAY BEFORE THE MASS OF IT PULLS
OFF THE EAST AND HEIGHTS QUICKLY RISE DURING THE DAY THURSDAY. THESE
HEIGHTS FLATTEN OUT LATER THURSDAY NIGHT AS A SHALLOW TROUGH MOVES
THIS WAY FROM THE NORTHERN PLAINS. WITH THIS GOOD AGREEMENT...AND THE
ONGOING WINTER STORM...HAVE LEANED MOST HEAVILY ON THE HIGHER
RESOLUTION NAM12 AND HRRR FOR WEATHER DETAILS.
SENSIBLE WEATHER WILL FEATURE THE UPSLOPE RAIN...CHANGING TO SNOW
LATE THIS AFTERNOON AND EARLY EVENING AND THEN CONTINUING THROUGH
THE EVENING FOR MOST LOCATIONS. THE SNOW WILL LINGER THE LONGEST IN
THE FAR EASTERN PARTS OF THE AREA THROUGH THE MIDDLE OF THE NIGHT.
LOOKING AT AN INCH OR LESS OF ACCUMULATION FOR MOST AREAS...WITH
THOSE HIGHER TOTALS MAINLY ON THE RIDGES. DO EXPECT NEARLY ALL SPOTS
TO GET A DUSTING OF SNOW EVEN IN THE VALLEYS...BUT THE LAG IN THE
COOLING OF THE ROADS SHOULD KEEP THEM MOSTLY CLEAR. THE FAR SOUTHEAST
PARTS OF THE CWA ARE A BIT DIFFERENT...THOUGH...AS THE UPSLOPE WILL
HOLD IN LONGER THERE...TEMPERATURES ARE DROPPING OFF QUICKER IN THE
HIGHER ELEVATIONS...THE HRRR IS HITTING THEM HARDEST WITH QPF...AND
THEY HAVE HIGHER ELEVATION WELL TRAVELED ROADS. FOR THESE REASONS
HAVE ISSUED A WSW FOR HARLAN...LETCHER...AND PIKE COUNTIES THROUGH
4Z...MATCHING UP WITH MRX IN WISE COUNTY.
THE SNOW WILL TAPER TO FLURRIES AND END LATE TONIGHT AND EARLY
THURSDAY MORNING FROM WEST TO EAST. TEMPERATURES WILL BOTTOM OUT IN
THE UPPER TEENS MOST PLACES BY DAWN WITH STILL ENOUGH OF A BREEZE TO
GENERATE WIND CHILLS IN THE SINGLE DIGITS OR NEAR ZERO ON THE HIGHEST
RIDGES. THE LOW CLOUDS WILL CLEAR OUR LATER THURSDAY MORNING WITH
SUNSHINE LIKELY EVAPORATING ANY OF THE SNOW FROM THIS SYSTEM BY MID
AFTERNOON DESPITE TEMPERATURES STRUGGLING TO GET TOO DEEP INTO THE
30S. A PARTLY CLOUDY SKY ON THURSDAY NIGHT WILL SET THE STAGE FOR A
MILDER NIGHT...BUT THIS WILL ALSO REPRESENT A DECENT RIDGE TO VALLEY
TEMPERATURE SPLIT SET UP.
USED A MODIFIED COLDER VERSION OF THE CONSSHORT FOR TEMPS DURING THE
NEXT 24 HOURS AND THEN FAVORED THE NAM12 DIURNAL CURVE WITH ADJUSTED
CONSALL MAX AND MIN T STARTING POINTS THROUGH FRIDAY MORNING. ALSO...
USED THE BCCONSSHORT FOR TD AND WINDS WITH THE CONSALL AFTER THE
FIRST 24 HOURS. THESE WERE MASSAGED FOR THE CURRENT CONDITIONS AND
TRENDS. AS FOR POPS...ENDED UP ON THE HIGH SIDE OF ALL GUIDANCE GIVEN
ITS POOR HISTORY OF PICKING UP ON LOW QPF UPSLOPE SNOW EVENTS.
.LONG TERM...(FRIDAY THROUGH WEDNESDAY)
ISSUED AT 325 PM EDT WED MAR 12 2014
SPLIT FLOW PATTERN WILL BE IN PLACE AT THE BEGINNING OF THE LONG
TERM PORTION OF THE FORECAST WITH NEAR ZONAL FLOW ACROSS THE OH AND
TN VALLEYS. AT THE SURFACE HIGH PRESSURE WILL BE TO OUR SOUTHEAST
WITH SOUTHWEST LOW LEVEL FLOW ACROSS OUR AREA. AS A RESULT TEMPERATURES
WILL WARM NICELY WITH MAXIMUM TEMPERATURES ON FRIDAY 20 TO 25
DEGREES WARMER THAN ON THURSDAY.
AS WE MOVE INTO THE WEEKEND A SOUTHERN STREAM SHORT WAVE WILL EMERGE
FROM THE SOUTHERN PLAINS WITH THE ASSOCIATED SURFACE LOW TRACKING
ACROSS THE LOWER MS VALLEY AND THE SOUTHEAST UNITED STATES. AT THE
SAME TIME A NORTHERN STREAM SHORT WAVE WILL BE DROPPING SE FROM THE
NORTHERN PLAINS. THE COMBINED EFFECTS WILL BE TO BRING A CHANCE OF
PRECIPITATION TO THE AREA FOR THE WEEKEND. THERE WILL ONLY BE LOW
CHANCES OF PRECIPITATION ON SATURDAY...WITH PRECIPITATION CHANCES
PEAKING ON SUNDAY. TEMPERATURES WILL BE WARM ENOUGH THAT ANY
PRECIPITATION FROM FRIDAY NIGHT INTO SUNDAY WILL BE IN THE FORM OF
RAIN. ENOUGH COLD AIR LOOKS TO WORK INTO THE AREA ON THE BACKSIDE OF
THE SYSTEM SUNDAY NIGHT INTO EARLY MONDAY MORNING THAT PRECIPITATION
COULD END AS SNOW. THERE IS NOT GOOD MODEL AGREEMENT AT THIS POINT
IN TIME...BUT SOME LIGHT SNOW ACCUMULATION LOOKS POSSIBLE.
THERE IS POOR MODEL AGREEMENT AS WE MOVE INTO NEXT WEEK AND
CONFIDENCE IN THE VARIOUS MODEL SOLUTIONS DECREASES. AFTER A COLD
START TO THE WEEK...TEMPERATURES WILL WARM...BUT THE WHEN AND WHERE
OF THE NEXT SHORT WAVE TO AFFECT THE AREA ARE UNCERTAIN. FOR NOW
WILL KEEP THE WEATHER DRY THROUGH TUESDAY NIGHT...AND BRING A SLIGHT
CHANCE OF SHOWERS INTO THE FAR WESTERN PART OF THE FORECAST AREA ON
WEDNESDAY.
&&
.AVIATION...(FOR THE 18Z TAFS THROUGH 18Z THURSDAY AFTERNOON)
ISSUED AT 205 PM EDT WED MAR 12 2014
LOW MVFR/IFR CIGS WILL AFFECT THE AREA INTO THE EVENING BEHIND THE
COLD FRONT THAT JUST PASSED THROUGH. WITH THIS FROPA...WINDS HAVE
SHIFTED TO THE WEST AND NORTHWEST AT BETWEEN 15 AND 25 KTS WITH WIND
GUSTS CLOSER TO 35 KTS. LINGERING RAIN SHOWERS WILL CHANGEOVER TO
SNOW SHOWERS FROM NORTHWEST TO SOUTHEAST BETWEEN 20 AND 00Z.
FOLLOWING THIS...THERE WILL BE A PERIOD OF SNOW SHOWERS...LASTING
LONGEST IN THE NORTHEAST PARTS OF THE FORECAST AREA. DURING THIS...
CIGS AND VIS WILL BE IFR OR WORSE...FOR AT TIME. CEILINGS WILL
GRADUALLY IMPROVE TOWARDS DAWN FROM WEST TO EAST WITH VFR CONDITIONS
POSSIBLE BY MID MORNING THURSDAY. WINDS WILL SLACKEN LATER TONIGHT
FROM THE NORTHWEST AND THEN CONTINUE AT 5 TO 10 KTS FROM THE WEST
THROUGH THE DAY THURSDAY.
&&
.JKL WATCHES/WARNINGS/ADVISORIES...
WIND ADVISORY UNTIL 10 PM EDT THIS EVENING FOR KYZ044-050>052-
058>060-068-069-079-080-083>088-104-106>120.
WINTER WEATHER ADVISORY FROM 8 PM THIS EVENING TO 4 AM EDT
THURSDAY FOR KYZ088-118-120.
&&
$$
SHORT TERM...GREIF
LONG TERM...SBH
AVIATION...GREIF
AREA FORECAST DISCUSSION...UPDATED
NWS JACKSON KY
210 PM EDT WED MAR 12 2014
.UPDATE...
ISSUED AT 210 PM EDT WED MAR 12 2014
DID A QUICK UPDATE TO THE GRIDS AND FORECAST TO REFLECT THE EXITING
OF THE COLD FRONT AND REMOVE THE RISK OF THUNDER. ALSO...FINE TUNED
POPS/WX AND TEMPERATURES THROUGH THE EVENING. THESE FRESHENED GRIDS
HAVE BEEN SENT WITH THE ZFP AND HWO ALSO REVISED.
UPDATE ISSUED AT 1055 AM EDT WED MAR 12 2014
14Z SFC ANALYSIS SHOWS A DEEP LOW PRESSURE AREA OFF TO OUR NORTHEAST
WHILE ITS SHARP COLD FRONT IS NOW CUTTING INTO EAST KENTUCKY. THIS
BOUNDARY SIGNALS THE DROPOFF IN THE TEMPERATURES AND ARRIVAL OF THE
HIGHER WIND GUSTS...UP TO 45 MPH...ON WEST TO NORTHWEST WINDS. OVER
EAST KENTUCKY THE SOUTHWEST WINDS AHEAD OF THE BOUNDARY HAVE MIXED
THE COLDER VALLEYS OUT SO THAT MOST AREAS ARE NOW IN THE UPPER 50S
AND LOWER 60S WHICH IS WHERE OUR HIGH TEMPS WILL END UP. DEWPOINTS
HAVE SURGED AHEAD OF THE FRONT INTO THE MIDDLE AND UPPER 50S...AS
WELL. THIS MAY BE GIVING JUST ENOUGH ENERGY TO GENERATE A RUMBLE OF
THUNDER WITH THE FRONT. THEREAFTER...TEMPERATURES PLUMMET WITH A BIT
OF A LULL IN THE STEADIER PCPN...THOUGH ANY LINGERING SHOWERS WILL
CHANGE TO SNOW FROM NORTHWEST TO SOUTHEAST LATER THIS AFTERNOON...
GENERALLY FROM 3 PM IN THE FAR NORTH TO 5 PM DOWN TO THE HAL ROGERS
PARKWAY AND THE HIGHER TERRAIN IN THE FAR EAST. THE REST OF THE CWA
SHOULD GO OVER TO SNOW OR BE COLD ENOUGH FOR ALL SNOW AROUND 6 PM.
PER THE LATEST HRRR AND NAM12 THE SNOW SHOULD BE RATHER MEAGER
THROUGH DARK BUT THEN KICK IN FOR SEVERAL HOURS MOST PLACES INTO MID
EVENING BEFORE TAPERING OFF FROM WEST TO EAST. THE WINDS WILL KEEP
THE SNOW BLOWING AROUND AND REDUCE VISIBILITY EVEN AS IT HAS TROUBLE
ACCUMULATING ON THE STILL TEMPORARILY WARM ROADS. THIS WILL CHANGE
WITH TIME...BUT MUCH OF THE SNOW WILL BE GONE BEFORE THE ROAD SFCS
ARE COLD ENOUGH TO STICK. EVEN SO...WOULD NOT BE SURPRISED TO HEAR OF
SLICK SPOTS AND LOW VISIBILITY ISSUES BETWEEN 7 AND 10 PM FOR MUCH
OF THE AREA. THE SPS CURRENTLY HAS THIS ADDRESSED...BUT AN ADVISORY
MAY BE WARRANTED IF WE SEE SIGNS OF BEEFIER SNOWS AND BETTER
ACCUMULATIONS UPSTREAM. WILL CONTINUE TO MONITOR THIS. THE HIGHEST
SNOW ACCUMULATIONS ARE EXPECTED OVER THE HIGHER TERRAIN IN THE FAR
SOUTHEAST WITH UP TO 2 INCHES POSSIBLE ON THE PEAKS NEAR VIRGINA. AN
ADVISORY THERE WOULD NOT BE A STRETCH AT THIS POINT...EITHER. WILL
GIVE THE NEW GFS A GANDER BEFORE MAKING ANY FINAL DECISIONS...THOUGH.
THE GRIDS HAVE BEEN UPDATED TO FINE TUNE THE FROPA...WINDS...AND CAA.
THESE HAVE BEEN SENT TO THE NDFD AND WEB SERVERS. A ZFP UPDATE CAN BE
ANTICIPATED ONCE THE FRONT IS THROUGH THE ENTIRE CWA IN AN HOUR OR SO
TO CLEAR UP WORDING AND TIMING.
UPDATE ISSUED AT 842 AM EDT WED MAR 12 2014
FRESHENED UP THE HOURLY TEMPERATURES...DEW POINTS...AND POPS ACCORDING
TO THE LATEST TRENDS IN OBSERVATIONS AND RADAR. THE SURFACE COLD FRONT
LOOKS TO BE ON OUR DOORSTEP JUST BEFORE 11 AM...WITH A DISTINCTIVE
BREAK IN THE PRECIP BETWEEN SHOWERS AFFECTING OUR AREA RIGHT NOW AND
THE FRONT. THERE IS ALSO ANOTHER BREAK IN THE ACTION BEHIND THE INITIAL
COLD FRONT...BEFORE PRECIP FILLS IN ONCE AGAIN AT THE CUSP OF THE
COLDER AIR. HAVE ATTEMPTED TO TIME ALL OF THIS A BIT BETTER FOR THE
NEXT SEVERAL HOURS. IT DOES APPEAR THAT THE COLD AIR IS LAGGING JUST
A TAD LATER. MOST OF THE STRONGER WIND GUSTS ARE OCCURRING ALONG AND
BEHIND THE FRONT. UPDATES HAVE BEEN SENT.
&&
.SHORT TERM...(TODAY THROUGH THURSDAY)
ISSUED AT 344 AM EDT WED MAR 12 2014
THE LATEST SURFACE MAP FEATURES DEEPENING SURFACE LOW PRESSURE
CURRENTLY CENTERED ACROSS SOUTHERN IL/IN. A SHARP COLD FRONT IS DRAPED
FROM SOUTHEASTERN MO DOWN THROUGH EASTERN TX. HIGH PRESSURE EXTENDS
FROM THE PACIFIC NORTHWEST DOWN ACROSS THE ROCKIES...SETTING UP A
TIGHT PRESSURE GRADIENT ACROSS THE PLAINS. ALOFT...A WEAKENING SHORT
WAVE TROUGH IS ROTATING OVER THE FLORIDA PANHANDLE. A DEEPER TROUGH IS
MOVING INTO THE NORTHERN PLAINS/GREAT LAKES WITH A LEAD SHORT WAVE
MOVING THROUGH MO/IL. EASTERN KENTUCKY REMAINS PLANTED IN THE WARM
SECTOR...WITH MOST LOCATIONS REPORTING TEMPERATURES IN THE 50S AND
LOW 60S...WHILE A FEW SHELTERED VALLEYS REMAIN DECOUPLED...REPORTING
IN THE MID AND UPPER 40S.
THE MODELS ARE IN GOOD AGREEMENT WITH THE SHORT TERM...WITH THE
NORTHERN STREAM TROUGH AMPLIFYING ACROSS THE EASTERN CONUS THROUGH
TONIGHT...AND ALLOWING THE SURFACE LOW TO CONTINUE TO INTENSIFY AS IT
SLIDES ENE ALONG AND JUST NORTH OF THE OHIO RIVER TODAY...REACHING
THE NORTHERN NEW ENGLAND COAST BY EARLY THURSDAY MORNING.
THIS STRONG STORM SYSTEM WILL BRING MULTIPLE IMPACTS TO EASTERN
KENTUCKY TODAY AND TONIGHT. WIDESPREAD SHOWERS...ALONG WITH AN
ISOLATED THUNDERSTORM CAN BE EXPECTED TODAY. SURFACE WINDS WILL ALSO
BECOME STRONG DURING THE DAY...FIRST OUT OF THE SOUTHWEST...AND THEN
QUICKLY SHIFTING TO THE WEST AND NORTHWEST...AS THE COLD FRONT PLOWS
THROUGH THE AREA BETWEEN 12 AND 4 PM. SUSTAINED SPEEDS RANGING FROM
15 TO 30 MPH...WITH GUSTS IN THE 35 TO 45 MPH RANGE STILL LOOK ON
TARGET.
AS COLDER AIR RUSHES IN BEHIND THE FRONT...RAIN SHOWERS WILL CHANGE
OVER TO SNOW SHOWERS. THE MODELS HAVE TRENDED SOMEWHAT SLOWER WITH
THE ARRIVAL OF THE COLDER AIR...PARTICULARLY THE NAM. HAVE ADJUSTED
THE TIMING BACK A TAD...BUT STILL AHEAD OF THE MODELS...AS THEY TEND
TO BE A LITTLE SLOW WITH THESE KINDS OF DYNAMIC SYSTEMS. AS
SUCH...EXPECT THE CHANGEOVER CLOSER TO THE 2 TO 3 PM TIME FRAME IN
THE BLUEGRASS...AND IN THE 5 TO 6 PM RANGE IN THE SOUTHEAST FOR MOST
LOCATIONS. HAVE NOT ADJUSTED AMOUNTS MUCH FROM THE PREVIOUS
FORECAST...WITH A HALF INCH OR LESS FOR VALLEYS...AND UP TO AN INCH
FOR RIDGETOPS. WILL HAVE TO WATCH THE SOUTHEAST TERRAIN COUNTIES
TONIGHT THOUGH...AS THE LATEST NAM IS A LITTLE BEEFIER WITH LIFT AND
MOISTURE. FOR NOW...WILL CONTINUE WITH A SPECIAL WEATHER STATEMENT
HIGHLIGHTING THE MULTIPLE IMPACTS.
SNOW SHOWERS WILL GRADUALLY TAPER OFF FROM NORTHWEST TO SOUTHEAST
TONIGHT...LINGERING LONGEST IN THE FAR SOUTHEAST. NORTHWEST WINDS
WILL DIMINISH THROUGH THE EVENING...HOWEVER THE COMBINATION OF THE
WIND AND TEMPERATURES FALLING INTO THE TEENS...WILL STILL ALLOW FOR
SOME SINGLE DIGIT WIND CHILL READINGS LATE TONIGHT INTO EARLY
THURSDAY MORNING. HIGH PRESSURE WILL MOVE IN FOR THURSDAY...GRADUALLY
BRINGING ANY LINGERING SNOW FLURRIES TO AN END. HIGHS STILL LOOK TO
NOT MAKE IT OUT OF THE 30S.
.LONG TERM...(THURSDAY NIGHT THROUGH TUESDAY)
ISSUED AT 335 AM EDT WED MAR 12 2014
EXTENDED PERIOD WILL BE FAIRLY BENIGN COMPARED TO THE SHORT TERM.
HOWEVER...CONFIDENCE IN MODELS IS FAIRLY LOW FROM 0Z SATURDAY
ON...AS THEY ARE HAVING A VERY HARD TIME AGREEING ON UPPER LEVEL
FLOW...AND AS A RESULT...SURFACE FEATURES TO IMPACT EASTERN KY. WILL
RELY ON THE ALLBLEND SOLUTION FOR DAYS 4 THROUGH 7 WITH A GENERAL
BLEND OF THE MODELS FOR THIS DISCUSSION.
LUCKILY...0Z FRIDAY THROUGH 0Z SATURDAY IS THE ONE PERIOD WHERE SOME
CONFIDENCE DOES EXISTS. THE LONGWAVE TROUGH WHICH CONTRIBUTED TO THE
RETURN OF WINTER PRECIP AND TEMPS WILL BE EXITING FROM THE
REGION...WITH PRESSURE HEIGHTS BUILDING THROUGHOUT THE NIGHT AND
BECOMING MORE ZONAL DURING THE DAY FRIDAY. THIS TREND WILL LEAD TO
SURFACE HIGH PRESSURE AND DRY...WARMING CONDITIONS AT THE SURFACE
THURSDAY NIGHT THROUGH FRIDAY. WHILE HIGHS ON THURSDAY WILL ONLY BE
IN THE LOW TO MID 30S...FRIDAY WILL INCREASE QUITE NICELY INTO THE
MID AND UPPER 50S FOR HIGHS.
MODELS ARE THEN POINTING AT A SHORTWAVE OVER THE SOUTHERN PLAINS BY
06Z SATURDAY. THIS SHORTWAVE WILL HAVE STARTED OFF AS A CLOSED LOW
OVER ARIZONA AND NEW MEXICO FRIDAY...AND MOVED ONLY SLIGHTLY BY
SATURDAY WHILE LOSING SUBSTANTIAL STRENGTH. MODELS ARE ALL IN
AGREEMENT THAT THIS TROUGH WILL CONTINUE TO SLOWLY WEAKEN AS IT
MAKES ITS WAY ENE TOWARDS THE OHIO RIVER VALLEY. HOWEVER...THIS IS
ABOUT ALL THE AGREE ON. AT THE SURFACE...EXPECT THIS SHORTWAVE TO
LEAD TO A SURFACE LOW PRESSURE SYSTEM...WITH SOME IMPACTS TO
KENTUCKY AS IT PASSES THROUGH. HOWEVER...EVERY MODEL VARIES GREATLY
ON THE EXTENT OF THE IMPACTS AND THE TIMING. THE GFS40 IS THE
FASTEST SOLUTION...WITH A LINE OF PRECIP MOVING IN BETWEEN 6 AND 12Z
SATURDAY...THE GEM IS ALMOST 24 HOURS LATER...AND THE ECMWF IS
ANOTHER 6 HOURS AFTER THAT. AS A RESULT...LEANED ON THE ALLBLEND
SOLUTION AS THE BEST COMPROMISE AT THIS POINT.
MODELS CONTINUE TO DIVERGE IN SOLUTIONS FROM HERE ON OUT. DO EXPECT
ANOTHER FEW SHORTWAVES TO IMPACT THE CWA THROUGH THE REST OF THE
EXTENDED...BRINGING MORE CHANCES OF PRECIPITATION...BUT CONFIDENCE
IS SO LOW ON WHEN AND WHERE ANYTHING WILL SET UP THAT WILL GO WITH
ALLBLEND...AND THEN REDUCE ANY CHANCES THAT ARE WITHIN THE ALLBLEND
DOWN TO SLIGHT SO AS NOT TO GIVE PREFERENCE OVER ONE MODEL OR
ANOTHER. CHANCES WILL BE INCREASED AS MODELS START TO COME INTO
BETTER AGREEMENT OVER THE NEXT FEW FORECAST CYCLES.
AS FOR TEMPERATURES AND PRECIPITATION TYPE...SIMILAR PROBLEMS EXIST.
HOWEVER...IF UPPER LEVEL HEIGHTS DO FALL...IT WILL NOT BE BY A
SIGNIFICANT AMOUNT...SO EXPECT TEMPERATURES TO REMAIN RIGHT AROUND
IF NOT SLIGHTLY BELOW NORMAL THROUGH THE REMAINDER OF THE EXTENDED.
IF THIS HOLDS TRUE...PRECIP WILL FALL IN THE FORM OF RAIN DURING THE
DAY AND OVERNIGHT...WITH THE EXCEPTION OF SUNDAY NIGHT...WHERE TEMPS
COULD COOL OFF TO JUST BELOW FREEZING AND CAUSE A RAIN/SNOW MIX
ACROSS THE AREA INSTEAD.
&&
.AVIATION...(FOR THE 18Z TAFS THROUGH 18Z THURSDAY AFTERNOON)
ISSUED AT 205 PM EDT WED MAR 12 2014
LOW MVFR/IFR CIGS WILL AFFECT THE AREA INTO THE EVENING BEHIND THE
COLD FRONT THAT JUST PASSED THROUGH. WITH THIS FROPA...WINDS HAVE
SHIFTED TO THE WEST AND NORTHWEST AT BETWEEN 15 AND 25 KTS WITH WIND
GUSTS CLOSER TO 35 KTS. LINGERING RAIN SHOWERS WILL CHANGEOVER TO
SNOW SHOWERS FROM NORTHWEST TO SOUTHEAST BETWEEN 20 AND 00Z.
FOLLOWING THIS...THERE WILL BE A PERIOD OF SNOW SHOWERS...LASTING
LONGEST IN THE NORTHEAST PARTS OF THE FORECAST AREA. DURING THIS...
CIGS AND VIS WILL BE IFR OR WORSE...FOR AT TIME. CEILINGS WILL
GRADUALLY IMPROVE TOWARDS DAWN FROM WEST TO EAST WITH VFR CONDITIONS
POSSIBLE BY MID MORNING THURSDAY. WINDS WILL SLACKEN LATER TONIGHT
FROM THE NORTHWEST AND THEN CONTINUE AT 5 TO 10 KTS FROM THE WEST
THROUGH THE DAY THURSDAY.
&&
.JKL WATCHES/WARNINGS/ADVISORIES...
WIND ADVISORY UNTIL 10 PM EDT THIS EVENING FOR KYZ044-050>052-
058>060-068-069-079-080-083>088-104-106>120.
&&
$$
UPDATE...GREIF
SHORT TERM...GEOGERIAN
LONG TERM...JMW
AVIATION...GREIF
AREA FORECAST DISCUSSION...UPDATED
NWS JACKSON KY
1055 AM EDT WED MAR 12 2014
.UPDATE...
ISSUED AT 1055 AM EDT WED MAR 12 2014
14Z SFC ANALYSIS SHOWS A DEEP LOW PRESSURE AREA OFF TO OUR NORTHEAST
WHILE ITS SHARP COLD FRONT IS NOW CUTTING INTO EAST KENTUCKY. THIS
BOUNDARY SIGNALS THE DROPOFF IN THE TEMPERATURES AND ARRIVAL OF THE
HIGHER WIND GUSTS...UP TO 45 MPH...ON WEST TO NORTHWEST WINDS. OVER
EAST KENTUCKY THE SOUTHWEST WINDS AHEAD OF THE BOUNDARY HAVE MIXED
THE COLDER VALLEYS OUT SO THAT MOST AREAS ARE NOW IN THE UPPER 50S
AND LOWER 60S WHICH IS WHERE OUR HIGH TEMPS WILL END UP. DEWPOINTS
HAVE SURGED AHEAD OF THE FRONT INTO THE MIDDLE AND UPPER 50S...AS
WELL. THIS MAY BE GIVING JUST ENOUGH ENERGY TO GENERATE A RUMBLE OF
THUNDER WITH THE FRONT. THEREAFTER...TEMPERATURES PLUMMET WITH A BIT
OF A LULL IN THE STEADIER PCPN...THOUGH ANY LINGERING SHOWERS WILL
CHANGE TO SNOW FROM NORTHWEST TO SOUTHEAST LATER THIS AFTERNOON...
GENERALLY FROM 3 PM IN THE FAR NORTH TO 5 PM DOWN TO THE HAL ROGERS
PARKWAY AND THE HIGHER TERRAIN IN THE FAR EAST. THE REST OF THE CWA
SHOULD GO OVER TO SNOW OR BE COLD ENOUGH FOR ALL SNOW AROUND 6 PM.
PER THE LATEST HRRR AND NAM12 THE SNOW SHOULD BE RATHER MEAGER
THROUGH DARK BUT THEN KICK IN FOR SEVERAL HOURS MOST PLACES INTO MID
EVENING BEFORE TAPERING OFF FROM WEST TO EAST. THE WINDS WILL KEEP
THE SNOW BLOWING AROUND AND REDUCE VISIBILITY EVEN AS IT HAS TROUBLE
ACCUMULATING ON THE STILL TEMPORARILY WARM ROADS. THIS WILL CHANGE
WITH TIME...BUT MUCH OF THE SNOW WILL BE GONE BEFORE THE ROAD SFCS
ARE COLD ENOUGH TO STICK. EVEN SO...WOULD NOT BE SURPRISED TO HEAR OF
SLICK SPOTS AND LOW VISIBILITY ISSUES BETWEEN 7 AND 10 PM FOR MUCH
OF THE AREA. THE SPS CURRENTLY HAS THIS ADDRESSED...BUT AN ADVISORY
MAY BE WARRANTED IF WE SEE SIGNS OF BEEFIER SNOWS AND BETTER
ACCUMULATIONS UPSTREAM. WILL CONTINUE TO MONITOR THIS. THE HIGHEST
SNOW ACCUMULATIONS ARE EXPECTED OVER THE HIGHER TERRAIN IN THE FAR
SOUTHEAST WITH UP TO 2 INCHES POSSIBLE ON THE PEAKS NEAR VIRGINA. AN
ADVISORY THERE WOULD NOT BE A STRETCH AT THIS POINT...EITHER. WILL
GIVE THE NEW GFS A GANDER BEFORE MAKING ANY FINAL DECISIONS...THOUGH.
THE GRIDS HAVE BEEN UPDATED TO FINE TUNE THE FROPA...WINDS...AND CAA.
THESE HAVE BEEN SENT TO THE NDFD AND WEB SERVERS. A ZFP UPDATE CAN BE
ANTICIPATED ONCE THE FRONT IS THROUGH THE ENTIRE CWA IN AN HOUR OR SO
TO CLEAR UP WORDING AND TIMING.
UPDATE ISSUED AT 842 AM EDT WED MAR 12 2014
FRESHENED UP THE HOURLY TEMPERATURES...DEW POINTS...AND POPS ACCORDING
TO THE LATEST TRENDS IN OBSERVATIONS AND RADAR. THE SURFACE COLD FRONT
LOOKS TO BE ON OUR DOORSTEP JUST BEFORE 11 AM...WITH A DISTINCTIVE
BREAK IN THE PRECIP BETWEEN SHOWERS AFFECTING OUR AREA RIGHT NOW AND
THE FRONT. THERE IS ALSO ANOTHER BREAK IN THE ACTION BEHIND THE INITIAL
COLD FRONT...BEFORE PRECIP FILLS IN ONCE AGAIN AT THE CUSP OF THE
COLDER AIR. HAVE ATTEMPTED TO TIME ALL OF THIS A BIT BETTER FOR THE
NEXT SEVERAL HOURS. IT DOES APPEAR THAT THE COLD AIR IS LAGGING JUST
A TAD LATER. MOST OF THE STRONGER WIND GUSTS ARE OCCURRING ALONG AND
BEHIND THE FRONT. UPDATES HAVE BEEN SENT.
&&
.SHORT TERM...(TODAY THROUGH THURSDAY)
ISSUED AT 344 AM EDT WED MAR 12 2014
THE LATEST SURFACE MAP FEATURES DEEPENING SURFACE LOW PRESSURE
CURRENTLY CENTERED ACROSS SOUTHERN IL/IN. A SHARP COLD FRONT IS DRAPED
FROM SOUTHEASTERN MO DOWN THROUGH EASTERN TX. HIGH PRESSURE EXTENDS
FROM THE PACIFIC NORTHWEST DOWN ACROSS THE ROCKIES...SETTING UP A
TIGHT PRESSURE GRADIENT ACROSS THE PLAINS. ALOFT...A WEAKENING SHORT
WAVE TROUGH IS ROTATING OVER THE FLORIDA PANHANDLE. A DEEPER TROUGH IS
MOVING INTO THE NORTHERN PLAINS/GREAT LAKES WITH A LEAD SHORT WAVE
MOVING THROUGH MO/IL. EASTERN KENTUCKY REMAINS PLANTED IN THE WARM
SECTOR...WITH MOST LOCATIONS REPORTING TEMPERATURES IN THE 50S AND
LOW 60S...WHILE A FEW SHELTERED VALLEYS REMAIN DECOUPLED...REPORTING
IN THE MID AND UPPER 40S.
THE MODELS ARE IN GOOD AGREEMENT WITH THE SHORT TERM...WITH THE
NORTHERN STREAM TROUGH AMPLIFYING ACROSS THE EASTERN CONUS THROUGH
TONIGHT...AND ALLOWING THE SURFACE LOW TO CONTINUE TO INTENSIFY AS IT
SLIDES ENE ALONG AND JUST NORTH OF THE OHIO RIVER TODAY...REACHING
THE NORTHERN NEW ENGLAND COAST BY EARLY THURSDAY MORNING.
THIS STRONG STORM SYSTEM WILL BRING MULTIPLE IMPACTS TO EASTERN
KENTUCKY TODAY AND TONIGHT. WIDESPREAD SHOWERS...ALONG WITH AN
ISOLATED THUNDERSTORM CAN BE EXPECTED TODAY. SURFACE WINDS WILL ALSO
BECOME STRONG DURING THE DAY...FIRST OUT OF THE SOUTHWEST...AND THEN
QUICKLY SHIFTING TO THE WEST AND NORTHWEST...AS THE COLD FRONT PLOWS
THROUGH THE AREA BETWEEN 12 AND 4 PM. SUSTAINED SPEEDS RANGING FROM
15 TO 30 MPH...WITH GUSTS IN THE 35 TO 45 MPH RANGE STILL LOOK ON
TARGET.
AS COLDER AIR RUSHES IN BEHIND THE FRONT...RAIN SHOWERS WILL CHANGE
OVER TO SNOW SHOWERS. THE MODELS HAVE TRENDED SOMEWHAT SLOWER WITH
THE ARRIVAL OF THE COLDER AIR...PARTICULARLY THE NAM. HAVE ADJUSTED
THE TIMING BACK A TAD...BUT STILL AHEAD OF THE MODELS...AS THEY TEND
TO BE A LITTLE SLOW WITH THESE KINDS OF DYNAMIC SYSTEMS. AS
SUCH...EXPECT THE CHANGEOVER CLOSER TO THE 2 TO 3 PM TIME FRAME IN
THE BLUEGRASS...AND IN THE 5 TO 6 PM RANGE IN THE SOUTHEAST FOR MOST
LOCATIONS. HAVE NOT ADJUSTED AMOUNTS MUCH FROM THE PREVIOUS
FORECAST...WITH A HALF INCH OR LESS FOR VALLEYS...AND UP TO AN INCH
FOR RIDGETOPS. WILL HAVE TO WATCH THE SOUTHEAST TERRAIN COUNTIES
TONIGHT THOUGH...AS THE LATEST NAM IS A LITTLE BEEFIER WITH LIFT AND
MOISTURE. FOR NOW...WILL CONTINUE WITH A SPECIAL WEATHER STATEMENT
HIGHLIGHTING THE MULTIPLE IMPACTS.
SNOW SHOWERS WILL GRADUALLY TAPER OFF FROM NORTHWEST TO SOUTHEAST
TONIGHT...LINGERING LONGEST IN THE FAR SOUTHEAST. NORTHWEST WINDS
WILL DIMINISH THROUGH THE EVENING...HOWEVER THE COMBINATION OF THE
WIND AND TEMPERATURES FALLING INTO THE TEENS...WILL STILL ALLOW FOR
SOME SINGLE DIGIT WIND CHILL READINGS LATE TONIGHT INTO EARLY
THURSDAY MORNING. HIGH PRESSURE WILL MOVE IN FOR THURSDAY...GRADUALLY
BRINGING ANY LINGERING SNOW FLURRIES TO AN END. HIGHS STILL LOOK TO
NOT MAKE IT OUT OF THE 30S.
.LONG TERM...(THURSDAY NIGHT THROUGH TUESDAY)
ISSUED AT 335 AM EDT WED MAR 12 2014
EXTENDED PERIOD WILL BE FAIRLY BENIGN COMPARED TO THE SHORT TERM.
HOWEVER...CONFIDENCE IN MODELS IS FAIRLY LOW FROM 0Z SATURDAY
ON...AS THEY ARE HAVING A VERY HARD TIME AGREEING ON UPPER LEVEL
FLOW...AND AS A RESULT...SURFACE FEATURES TO IMPACT EASTERN KY. WILL
RELY ON THE ALLBLEND SOLUTION FOR DAYS 4 THROUGH 7 WITH A GENERAL
BLEND OF THE MODELS FOR THIS DISCUSSION.
LUCKILY...0Z FRIDAY THROUGH 0Z SATURDAY IS THE ONE PERIOD WHERE SOME
CONFIDENCE DOES EXISTS. THE LONGWAVE TROUGH WHICH CONTRIBUTED TO THE
RETURN OF WINTER PRECIP AND TEMPS WILL BE EXITING FROM THE
REGION...WITH PRESSURE HEIGHTS BUILDING THROUGHOUT THE NIGHT AND
BECOMING MORE ZONAL DURING THE DAY FRIDAY. THIS TREND WILL LEAD TO
SURFACE HIGH PRESSURE AND DRY...WARMING CONDITIONS AT THE SURFACE
THURSDAY NIGHT THROUGH FRIDAY. WHILE HIGHS ON THURSDAY WILL ONLY BE
IN THE LOW TO MID 30S...FRIDAY WILL INCREASE QUITE NICELY INTO THE
MID AND UPPER 50S FOR HIGHS.
MODELS ARE THEN POINTING AT A SHORTWAVE OVER THE SOUTHERN PLAINS BY
06Z SATURDAY. THIS SHORTWAVE WILL HAVE STARTED OFF AS A CLOSED LOW
OVER ARIZONA AND NEW MEXICO FRIDAY...AND MOVED ONLY SLIGHTLY BY
SATURDAY WHILE LOSING SUBSTANTIAL STRENGTH. MODELS ARE ALL IN
AGREEMENT THAT THIS TROUGH WILL CONTINUE TO SLOWLY WEAKEN AS IT
MAKES ITS WAY ENE TOWARDS THE OHIO RIVER VALLEY. HOWEVER...THIS IS
ABOUT ALL THE AGREE ON. AT THE SURFACE...EXPECT THIS SHORTWAVE TO
LEAD TO A SURFACE LOW PRESSURE SYSTEM...WITH SOME IMPACTS TO
KENTUCKY AS IT PASSES THROUGH. HOWEVER...EVERY MODEL VARIES GREATLY
ON THE EXTENT OF THE IMPACTS AND THE TIMING. THE GFS40 IS THE
FASTEST SOLUTION...WITH A LINE OF PRECIP MOVING IN BETWEEN 6 AND 12Z
SATURDAY...THE GEM IS ALMOST 24 HOURS LATER...AND THE ECMWF IS
ANOTHER 6 HOURS AFTER THAT. AS A RESULT...LEANED ON THE ALLBLEND
SOLUTION AS THE BEST COMPROMISE AT THIS POINT.
MODELS CONTINUE TO DIVERGE IN SOLUTIONS FROM HERE ON OUT. DO EXPECT
ANOTHER FEW SHORTWAVES TO IMPACT THE CWA THROUGH THE REST OF THE
EXTENDED...BRINGING MORE CHANCES OF PRECIPITATION...BUT CONFIDENCE
IS SO LOW ON WHEN AND WHERE ANYTHING WILL SET UP THAT WILL GO WITH
ALLBLEND...AND THEN REDUCE ANY CHANCES THAT ARE WITHIN THE ALLBLEND
DOWN TO SLIGHT SO AS NOT TO GIVE PREFERENCE OVER ONE MODEL OR
ANOTHER. CHANCES WILL BE INCREASED AS MODELS START TO COME INTO
BETTER AGREEMENT OVER THE NEXT FEW FORECAST CYCLES.
AS FOR TEMPERATURES AND PRECIPITATION TYPE...SIMILAR PROBLEMS EXIST.
HOWEVER...IF UPPER LEVEL HEIGHTS DO FALL...IT WILL NOT BE BY A
SIGNIFICANT AMOUNT...SO EXPECT TEMPERATURES TO REMAIN RIGHT AROUND
IF NOT SLIGHTLY BELOW NORMAL THROUGH THE REMAINDER OF THE EXTENDED.
IF THIS HOLDS TRUE...PRECIP WILL FALL IN THE FORM OF RAIN DURING THE
DAY AND OVERNIGHT...WITH THE EXCEPTION OF SUNDAY NIGHT...WHERE TEMPS
COULD COOL OFF TO JUST BELOW FREEZING AND CAUSE A RAIN/SNOW MIX
ACROSS THE AREA INSTEAD.
&&
.AVIATION...(FOR THE 12Z TAFS THROUGH 12Z THURSDAY MORNING)
ISSUED AT 842 AM EDT WED MAR 12 2014
A STRENGTHENING AREA OF LOW PRESSURE WILL TRACK ACROSS NORTHERN
KENTUCKY DURING THE DAY...ALLOWING FOR THE REDEVELOPMENT OF SHOWERS
ALONG AND JUST BEHIND THE ASSOCIATED COLD FRONT. CEILINGS WILL DROP
DOWN TO LOW MVFR/IFR BEHIND THE FRONT...WITH POCKETS OF IFR
OCCURRING WITHIN ANY STRONGER SHOWERS. SOUTH TO SOUTHWEST WINDS WILL
INCREASE DURING THE DAY WITH GUSTS AS STRONG AS 25 TO 30 KT POSSIBLE
AHEAD OF THE FRONT. WINDS WILL SHIFT TO THE WEST AND NORTHWEST
BETWEEN 15 AND 18Z...WITH WIND GUSTS INCREASING CLOSER TO THE 30 TO
35 KT RANGE. RAIN SHOWERS WILL CHANGE OVER TO SNOW SHOWERS FROM
NORTHWEST TO SOUTHEAST BETWEEN 20 AND 00Z. CEILINGS WILL GRADUALLY
IMPROVE TOWARDS DAWN FROM NORTHWEST TO SOUTHEAST.
&&
.JKL WATCHES/WARNINGS/ADVISORIES...
WIND ADVISORY UNTIL 10 PM EDT THIS EVENING FOR KYZ044-050>052-
058>060-068-069-079-080-083>088-104-106>120.
&&
$$
UPDATE...GREIF
SHORT TERM...GEOGERIAN
LONG TERM...JMW
AVIATION...GEOGERIAN
AREA FORECAST DISCUSSION...UPDATED
NWS GRAY ME
1041 AM EDT WED MAR 12 2014
.SYNOPSIS...
LOW PRESSURE WILL MOVE NORTHEAST OUT OF THE OHIO VALLEY TODAY AND
WILL RAPIDLY INTENSIFY AS IT MOVES OFF THE NEW ENGLAND COAST
OVERNIGHT. LOW PRESSURE WILL CONTINUE NORTHEAST THROUGH THE
MARITIMES ON THURSDAY. A RIDGE OF HIGH PRESSURE WILL BUILD IN FROM
THE WEST THURSDAY NIGHT. HIGH PRESSURE WILL MOVE OFFSHORE ON
FRIDAY AS A WARM FRONT LIFTS INTO THE REGION FROM THE SOUTHWEST. A
COLD FRONT WILL APPROACH FROM THE WEST FRIDAY NIGHT AND SATURDAY
AND WILL SLOWLY CROSS THE REGION SATURDAY NIGHT. HIGH PRESSURE
WILL GRADUALLY BUILD IN FROM THE WEST SUNDAY THROUGH MONDAY.
&&
.NEAR TERM /THROUGH TONIGHT/...
UPDATE...VERY COMPLEX FORECAST TODAY AS LOW PRES RAMPS UP INVOF
KPIT ATTM. MID LEVEL FNT IS REALLY STARTING TO STRENGTHEN...AS
STRONG WAA DEVELOPS TO THE S OF THE LOW PRES TRACK...AND CAA
PRESSES DOWN FROM THE N. ALONG THIS BOUNDARY SIGNIFICANT PCPN IS
EXPECTED. LATEST TRENDS SHOW NO REASON TO DEVIATE FROM PREVIOUS
SHIFT/S AXIS OF HEAVIEST QPF.
CURRENT PCPN ACROSS MOST OF THE CWFA IS A BIT OF A KITCHEN SINK
SCENARIO...AS LINGERING WARM LAYERS ARE RESULTING IN
SLEET...FZRA...RNFL...AND SNFL. EXPECT THAT AS STRONGER LIFT MOVES
OVERHEAD THAT THINGS WILL FLIP TO SNFL...EXCEPT FOR THE IMMEDIATE
COAST. THEN AS MID LEVELS WARM THIS AFTERNOON...SNFL WILL
TRANSITION BACK TO A MIX FOR CENTRAL AND SRN AREAS.
ACROSS THE FAR N...IT IS IMPORTANT TO NOTE THAT COLD FNT IS
ALREADY DROPPING INTO PARTS OF NRN NEW ENGLAND. TEMPS AND
DEWPOINTS ACROSS NRN VT AND SRN QUEBEC ARE FALLING ATTM. HOW FAR
THIS BOUNDARY CAN ADVANCE SWD AHEAD OF THE LOW PRES WILL DETERMINE
JUST HOW FAR N THE RNFL WILL MAKE IT INTO NH ESPECIALLY. THOUGH
MID LEVELS MAY WARM ABOVE FREEZING...CENTRAL NH SHOULD REMAIN
BELOW FREEZING AT THE SURFACE...YIELDING MORE IN THE WAY OF SLEET
THAN RA.
PREVIOUSLY...
VERY TRICKY AND LOW CONFIDENCE FORECAST CONTINUES FOR THE COASTAL
PLAIN TODAY. MUCH OF THE 00Z GUIDANCE HAS WARMED FOR
TODAY...BASICALLY CATCHING UP TO WHAT THE ECMWF HAS BEEN SHOWING
FOR AWHILE NOW. THIS HAS RESULTED IN THE ADJUSTMENT OF THE TIMING
OF SOME OF THE WARNINGS AND ADVISORIES.
AS A RESULT OF THE COLUMN WARMING ACROSS SOUTHERN AREAS
TODAY...THE MID LEVEL FRONTOGENETICAL ZONE WILL BE PUSHED NORTH.
THE RESULT SHOULD BE A NORTHWARD PUSH OF THE MODERATE TO HEAVY
PRECIPITATION INTO THE MOUNTAINS AND FOOTHILLS FOR MUCH OF THE
DAY. IN FACT...THE LATEST HRRR AND RAP HAVE LITTLE IN THE WAY OF
PRECIPITATION TODAY ACROSS SOUTHERNMOST PORTIONS OF NH AND ME
THROUGH AT LEAST 21Z. THEREFORE...THE LIGHT NATURE OF THE
PRECIPITATION COMBINED WITH A WARMING COLUMN SHOULD NOT ALLOW FOR
WIDESPREAD HAZARDOUS WEATHER CONDITIONS THERE DURING MUCH OF THE
DAY TODAY NEAR THE COAST. IN FACT...JUST A LIGHT TO OCCASIONALLY
MODERATE RAIN MIXED WITH SNOW AND SLEET AT TIMES SEEMS TO BE THE
MOST LIKELY SCENARIO ALONG COASTAL ME SOUTHWESTWARD TO MUCH OF
SOUTHERN NH. CONSIDERED DOWNGRADING THE WARNINGS TO ADVISORIES IN
THESE AREAS...BUT SINCE COLD AIR IS EXPECTED TO RAPIDLY MOVE IN
TONIGHT RESULTING IN A HEAVY MIXED BAG OF SNOW...SLEET...AND
FREEZING RAIN COMBINED WITH STRONG WINDS...FELT IS WAS BEST TO
KEEP THE WARNINGS GOING. A FLASH FREEZE WILL BE POSSIBLE THIS
EVENING AT LOCATIONS THAT HOLD ONTO ABOVE FREEZING TEMPS TODAY.
WE/VE RADIATED DOWN TO AROUND FREEZING EARLY THIS WEDNESDAY
MORNING...AND THIS SHOULD RESULT IN SOME FROZEN/FREEZING
PRECIPITATION EARLY ON. MAY ADDRESS THIS WITH AN SPS DEPENDING ON
HOW THE RADAR LOOKS IN A FEW HOURS.
IN THE MOUNTAINS AND FOOTHILLS...EXPECT HEAVY SNOW
TODAY...POSSIBLY MIXED WITH SLEET. IN THE TRANSITION AREA BETWEEN
THE FOOTHILLS AND THE COASTAL PLAIN /EG...INTERIOR CUMBERLAND
COUNTY ME/...EXPECT OSCILLATING PRECIPITATION TYPES MAKING FOR
HAZARDOUS DRIVING CONDITIONS TODAY.
A VERY CHANGEABLE SITUATION IS EXPECTED TODAY...AND THEREFORE
FORECAST ADJUSTMENTS ARE LIKELY.
&&
.SHORT TERM /THURSDAY THROUGH THURSDAY NIGHT/...
AS STRONG LOW PRESSURE PULLS INTO THE GULF OF MAINE TONIGHT...LOW
LEVEL COLD AIR SHOULD RACE SOUTHEASTWARD TOWARD THE COAST. THIS
SHOULD CHANGE ANY RAIN OR RAIN/SLEET MIX TO A MIX OF
SNOW...SLEET...AND FREEZING RAIN. CURRENTLY FORECASTING UP TO A
QUARTER INCH OF ICE FOR THE COASTAL PLAIN TONIGHT BEFORE THE
COLUMN COOLS ENOUGH TO SUPPORT ALL SNOW. WINDS ARE EXPECTED TO
INCREASE THIS EVENING AND GUST UP TO 45 MPH. THEREFORE...AREAS
THAT SEE A WET SNOW AND/OR FREEZING RAIN MAY HAVE TO DEAL WITH
POWER OUTAGES AS THE NIGHT WEARS ON. THE SNOW SHOULD TAPER OFF
THURSDAY MORNING AND END BY EARLY AFTERNOON...LEAVING VERY COLD
AIR IN THE STORMS WAKE FOR THE BALANCE OF THE DAY.
&&
.LONG TERM /FRIDAY THROUGH TUESDAY/...
LOW PRESSURE WILL PULL AWAY THURSDAY NIGHT FOLLOWED BY A NARROW
RIDGE OF HIGH PRESSURE. EXPECT ANY LINGERING SNOW SHOWERS TO QUICKLY
COME TO AN END THURSDAY EVENING AND SKIES WILL CLEAR AS HIGH
PRESSURE BUILDS IN FROM THE WEST. TEMPERATURES WILL ONCE AGAIN END
UP WELL BELOW NORMAL WITH LOWS OF ZERO TO AROUND 10 BELOW IN THE
NORTH AND 5 BELOW TO 5 ABOVE IN THE SOUTH.
LOW PRESSURE CROSSING SOUTHERN CANADA FRIDAY WILL LIFT A WARM FRONT
INTO THE REGION IN THE AFTERNOON. WILL SEE INCREASING CLOUDS WITH A
CHANCE OF SNOW SHOWERS...MAINLY IN NORTHWEST ZONES DURING THE LATE
MORNING AND AFTERNOON. HIGH TEMPS WILL RANGE THROUGH THE 20S NORTH
AND IN THE LOWER TO MID 30S SOUTH.
PRE-FRONTAL TROUGH WILL BRING A CHANCE SNOW SHOWERS IN THE NORTH AND
RAIN SHOWERS OR MIXED PRECIP IN THE SOUTH FRIDAY NIGHT. NOT A LOT OF
FORCING WITH THIS BOUNDARY SO NOT LOOKING FOR MUCH IN THE WAY OF QPF.
TROUGH PUSHES OFFSHORE EARLY SATURDAY MORNING AND SKIES SHOULD
BECOME PARTLY TO MOSTLY SUNNY. COLD FRONT APPROACHING FROM THE
NORTHWEST WILL BRING MORE CLOUDS INTO NORTHWEST ZONES IN THE
AFTERNOON. EXPECT HIGHS RANGING THROUGH THE 40S.
COLD FRONT WILL SLOWLY CROSS THE REGION SATURDAY NIGHT WITH LITTLE
IF ANY FANFARE. WILL SEE THICKENING CLOUDS AND A CHANCE OF SNOW
SHOWERS IN THE MOUNTAINS AND JUST VARIABLE CLOUDINESS ELSEWHERE.
TEMPERATURES BY SUNDAY MORNING WILL RANGE FROM THE TEENS NORTH TO
THE LOWER TO MID 20S SOUTH.
SUNDAY LOOKING BREEZY AND COOLER BEHIND THE FRONT AS HIGH PRESSURE
BUILDING IN FROM THE WEST SETS UP A TIGHT NORTHWESTERLY GRADIENT
ACROSS THE REGION. EXPECT CLOUDS TO HANG TOUGH IN THE CONNECTICUT
VALLEY AND THE MOUNTAINS THROUGH THE DAY WITH A MIX OF SUN AND
CLOUDS ELSEWHERE.
HIGH PRESSURE WILL CONTINUE TO BUILD IN FROM THE WEST SUNDAY NIGHT
THROUGH MONDAY. HIGH PRESSURE WILL GRADUALLY SLIP OFFSHORE SOUTH OF
NEW ENGLAND MONDAY NIGHT AS A WEAK WARM FRONT LIFTS NORTH INTO
SOUTHERN CANADA NORTHWEST OF THE FORECAST AREA. WILL SEE INCREASING
CLOUDS OVERNIGHT AND POSSIBLY A FEW SNOW SHOWERS ON TUESDAY AS WEAK
OVER-RUNNING BRUSHES NORTHWEST ZONES.
&&
.AVIATION /15Z WEDNESDAY THROUGH SUNDAY/...
SHORT TERM...VFR CONDITIONS WILL DETERIORATE TO IFR OR LOWER BY
THIS AFTERNOON IN SNOW OR MIXED PRECIPITATION. LIFR CONDITIONS ARE
EXPECTED THROUGH TONIGHT INTO THURSDAY MORNING. WIND GUSTS UP TO
40 KT ARE EXPECTED TONIGHT WHICH WILL RESULT IN MECHANICAL
TURBULENCE.
LONG TERM...VFR THURSDAY NIGHT THROUGH SUNDAY.
&&
.MARINE...
SHORT TERM...GALES THIS AFTERNOON THROUGH THURSDAY IN ASSOCIATION
WITH COASTAL STORM.
LONG TERM...SCAS LIKELY THURSDAY NIGHT AND FRIDAY NIGHT. GALES
POSSIBLE SUNDAY NIGHT.
&&
.GYX WATCHES/WARNINGS/ADVISORIES...
ME...WINTER STORM WARNING UNTIL NOON EDT THURSDAY FOR MEZ007>009-
012>014.
WINTER STORM WARNING UNTIL NOON EDT THURSDAY FOR MEZ018>022.
WINTER STORM WARNING FROM 6 PM THIS EVENING TO NOON EDT
THURSDAY FOR MEZ024>028.
WINTER WEATHER ADVISORY FROM 6 PM THIS EVENING TO NOON EDT
THURSDAY FOR MEZ023.
NH...WINTER STORM WARNING UNTIL NOON EDT THURSDAY FOR NHZ001>007-
009.
WINTER STORM WARNING FROM 6 PM THIS EVENING TO NOON EDT
THURSDAY FOR NHZ008-010.
WINTER WEATHER ADVISORY FROM 6 PM THIS EVENING TO NOON EDT
THURSDAY FOR NHZ013-014.
MARINE...GALE WARNING FROM 4 PM THIS AFTERNOON TO 8 PM EDT THURSDAY FOR
ANZ150>154.
&&
$$
NEAR TERM...LEGRO
AREA FORECAST DISCUSSION...CORRECTED
NWS GRAY ME
945 AM EDT WED MAR 12 2014
.SYNOPSIS...
LOW PRESSURE WILL MOVE NORTHEAST OUT OF THE OHIO VALLEY TODAY AND
WILL RAPIDLY INTENSIFY AS IT MOVES OFF THE NEW ENGLAND COAST
OVERNIGHT. LOW PRESSURE WILL CONTINUE NORTHEAST THROUGH THE
MARITIMES ON THURSDAY. A RIDGE OF HIGH PRESSURE WILL BUILD IN FROM
THE WEST THURSDAY NIGHT. HIGH PRESSURE WILL MOVE OFFSHORE ON
FRIDAY AS A WARM FRONT LIFTS INTO THE REGION FROM THE SOUTHWEST. A
COLD FRONT WILL APPROACH FROM THE WEST FRIDAY NIGHT AND SATURDAY
AND WILL SLOWLY CROSS THE REGION SATURDAY NIGHT. HIGH PRESSURE
WILL GRADUALLY BUILD IN FROM THE WEST SUNDAY THROUGH MONDAY.
&&
.NEAR TERM /UNTIL 6 PM THIS EVENING/...
7 AM UPDATE...NO SIGNIFICANT CHANGES TO THE GOING FORECAST. JUST A
FEW MINOR ADJUSTMENTS BASED ON LATEST TRENDS IN OBSERVATIONAL DATA.
THINGS SEEM TO BE GOING AS PLANNED AT THE MOMENT. HOWEVER...ITS A
VERY CHANGEABLE SITUATION TODAY SOUTH OF THE MOUNTAINS...SO STAY
TUNED FOR FORECAST UPDATES.
PREVIOUSLY...
VERY TRICKY AND LOW CONFIDENCE FORECAST CONTINUES FOR THE COASTAL
PLAIN TODAY. MUCH OF THE 00Z GUIDANCE HAS WARMED FOR
TODAY...BASICALLY CATCHING UP TO WHAT THE ECMWF HAS BEEN SHOWING
FOR AWHILE NOW. THIS HAS RESULTED IN THE ADJUSTMENT OF THE TIMING
OF SOME OF THE WARNINGS AND ADVISORIES.
AS A RESULT OF THE COLUMN WARMING ACROSS SOUTHERN AREAS
TODAY...THE MID LEVEL FRONTOGENETICAL ZONE WILL BE PUSHED NORTH.
THE RESULT SHOULD BE A NORTHWARD PUSH OF THE MODERATE TO HEAVY
PRECIPITATION INTO THE MOUNTAINS AND FOOTHILLS FOR MUCH OF THE
DAY. IN FACT...THE LATEST HRRR AND RAP HAVE LITTLE IN THE WAY OF
PRECIPITATION TODAY ACROSS SOUTHERNMOST PORTIONS OF NH AND ME
THROUGH AT LEAST 21Z. THEREFORE...THE LIGHT NATURE OF THE
PRECIPITATION COMBINED WITH A WARMING COLUMN SHOULD NOT ALLOW FOR
WIDESPREAD HAZARDOUS WEATHER CONDITIONS THERE DURING MUCH OF THE
DAY TODAY NEAR THE COAST. IN FACT...JUST A LIGHT TO OCCASIONALLY
MODERATE RAIN MIXED WITH SNOW AND SLEET AT TIMES SEEMS TO BE THE
MOST LIKELY SCENARIO ALONG COASTAL ME SOUTHWESTWARD TO MUCH OF
SOUTHERN NH. CONSIDERED DOWNGRADING THE WARNINGS TO ADVISORIES IN
THESE AREAS...BUT SINCE COLD AIR IS EXPECTED TO RAPIDLY MOVE IN
TONIGHT RESULTING IN A HEAVY MIXED BAG OF SNOW...SLEET...AND
FREEZING RAIN COMBINED WITH STRONG WINDS...FELT IS WAS BEST TO
KEEP THE WARNINGS GOING. A FLASH FREEZE WILL BE POSSIBLE THIS
EVENING AT LOCATIONS THAT HOLD ONTO ABOVE FREEZING TEMPS TODAY.
WE/VE RADIATED DOWN TO AROUND FREEZING EARLY THIS WEDNESDAY
MORNING...AND THIS SHOULD RESULT IN SOME FROZEN/FREEZING
PRECIPITATION EARLY ON. MAY ADDRESS THIS WITH AN SPS DEPENDING ON
HOW THE RADAR LOOKS IN A FEW HOURS.
IN THE MOUNTAINS AND FOOTHILLS...EXPECT HEAVY SNOW
TODAY...POSSIBLY MIXED WITH SLEET. IN THE TRANSITION AREA BETWEEN
THE FOOTHILLS AND THE COASTAL PLAIN /EG...INTERIOR CUMBERLAND
COUNTY ME/...EXPECT OSCILLATING PRECIPITATION TYPES MAKING FOR
HAZARDOUS DRIVING CONDITIONS TODAY.
A VERY CHANGEABLE SITUATION IS EXPECTED TODAY...AND THEREFORE
FORECAST ADJUSTMENTS ARE LIKELY.
&&
.SHORT TERM /6 PM THIS EVENING THROUGH 6 PM THURSDAY/...
AS STRONG LOW PRESSURE PULLS INTO THE GULF OF MAINE TONIGHT...LOW
LEVEL COLD AIR SHOULD RACE SOUTHEASTWARD TOWARD THE COAST. THIS
SHOULD CHANGE ANY RAIN OR RAIN/SLEET MIX TO A MIX OF
SNOW...SLEET...AND FREEZING RAIN. CURRENTLY FORECASTING UP TO A
QUARTER INCH OF ICE FOR THE COASTAL PLAIN TONIGHT BEFORE THE
COLUMN COOLS ENOUGH TO SUPPORT ALL SNOW. WINDS ARE EXPECTED TO
INCREASE THIS EVENING AND GUST UP TO 45 MPH. THEREFORE...AREAS
THAT SEE A WET SNOW AND/OR FREEZING RAIN MAY HAVE TO DEAL WITH
POWER OUTAGES AS THE NIGHT WEARS ON. THE SNOW SHOULD TAPER OFF
THURSDAY MORNING AND END BY EARLY AFTERNOON...LEAVING VERY COLD
AIR IN THE STORMS WAKE FOR THE BALANCE OF THE DAY.
&&
.LONG TERM /THURSDAY NIGHT THROUGH TUESDAY/...
LOW PRESSURE WILL PULL AWAY THURSDAY NIGHT FOLLOWED BY A NARROW
RIDGE OF HIGH PRESSURE. EXPECT ANY LINGERING SNOW SHOWERS TO QUICKLY
COME TO AN END THURSDAY EVENING AND SKIES WILL CLEAR AS HIGH
PRESSURE BUILDS IN FROM THE WEST. TEMPERATURES WILL ONCE AGAIN END
UP WELL BELOW NORMAL WITH LOWS OF ZERO TO AROUND 10 BELOW IN THE
NORTH AND 5 BELOW TO 5 ABOVE IN THE SOUTH.
LOW PRESSURE CROSSING SOUTHERN CANADA FRIDAY WILL LIFT A WARM FRONT
INTO THE REGION IN THE AFTERNOON. WILL SEE INCREASING CLOUDS WITH A
CHANCE OF SNOW SHOWERS...MAINLY IN NORTHWEST ZONES DURING THE LATE
MORNING AND AFTERNOON. HIGH TEMPS WILL RANGE THROUGH THE 20S NORTH
AND IN THE LOWER TO MID 30S SOUTH.
PRE-FRONTAL TROUGH WILL BRING A CHANCE SNOW SHOWERS IN THE NORTH AND
RAIN SHOWERS OR MIXED PRECIP IN THE SOUTH FRIDAY NIGHT. NOT A LOT OF
FORCING WITH THIS BOUNDARY SO NOT LOOKING FOR MUCH IN THE WAY OF QPF.
TROUGH PUSHES OFFSHORE EARLY SATURDAY MORNING AND SKIES SHOULD
BECOME PARTLY TO MOSTLY SUNNY. COLD FRONT APPROACHING FROM THE
NORTHWEST WILL BRING MORE CLOUDS INTO NORTHWEST ZONES IN THE
AFTERNOON. EXPECT HIGHS RANGING THROUGH THE 40S.
COLD FRONT WILL SLOWLY CROSS THE REGION SATURDAY NIGHT WITH LITTLE
IF ANY FANFARE. WILL SEE THICKENING CLOUDS AND A CHANCE OF SNOW
SHOWERS IN THE MOUNTAINS AND JUST VARIABLE CLOUDINESS ELSEWHERE.
TEMPERATURES BY SUNDAY MORNING WILL RANGE FROM THE TEENS NORTH TO
THE LOWER TO MID 20S SOUTH.
SUNDAY LOOKING BREEZY AND COOLER BEHIND THE FRONT AS HIGH PRESSURE
BUILDING IN FROM THE WEST SETS UP A TIGHT NORTHWESTERLY GRADIENT
ACROSS THE REGION. EXPECT CLOUDS TO HANG TOUGH IN THE CONNECTICUT
VALLEY AND THE MOUNTAINS THROUGH THE DAY WITH A MIX OF SUN AND
CLOUDS ELSEWHERE.
HIGH PRESSURE WILL CONTINUE TO BUILD IN FROM THE WEST SUNDAY NIGHT
THROUGH MONDAY. HIGH PRESSURE WILL GRADUALLY SLIP OFFSHORE SOUTH OF
NEW ENGLAND MONDAY NIGHT AS A WEAK WARM FRONT LIFTS NORTH INTO
SOUTHERN CANADA NORTHWEST OF THE FORECAST AREA. WILL SEE INCREASING
CLOUDS OVERNIGHT AND POSSIBLY A FEW SNOW SHOWERS ON TUESDAY AS WEAK
OVER-RUNNING BRUSHES NORTHWEST ZONES.
&&
.AVIATION /07Z WEDNESDAY THROUGH SUNDAY/...
SHORT TERM...VFR CONDITIONS WILL DETERIORATE TO IFR OR LOWER BY
THIS AFTERNOON IN SNOW OR MIXED PRECIPITATION. LIFR CONDITIONS ARE
EXPECTED THROUGH TONIGHT INTO THURSDAY MORNING. WIND GUSTS UP TO
40 KT ARE EXPECTED TONIGHT WHICH WILL RESULT IN MECHANICAL
TURBULENCE.
LONG TERM...VFR THURSDAY NIGHT THROUGH SUNDAY.
&&
.MARINE...
SHORT TERM...GALES THIS AFTERNOON THROUGH THURSDAY IN ASSOCIATION
WITH COASTAL STORM.
LONG TERM...SCAS LIKELY THURSDAY NIGHT AND FRIDAY NIGHT. GALES
POSSIBLE SUNDAY NIGHT.
&&
.GYX WATCHES/WARNINGS/ADVISORIES...
ME...WINTER STORM WARNING FROM 8 AM THIS MORNING TO NOON EDT
THURSDAY FOR MEZ007>009-012>014.
WINTER STORM WARNING FROM 11 AM THIS MORNING TO NOON EDT
THURSDAY FOR MEZ018>022.
WINTER STORM WARNING FROM 6 PM THIS EVENING TO NOON EDT
THURSDAY FOR MEZ024>028.
WINTER WEATHER ADVISORY FROM 6 PM THIS EVENING TO NOON EDT
THURSDAY FOR MEZ023.
NH...WINTER STORM WARNING FROM 8 AM THIS MORNING TO NOON EDT
THURSDAY FOR NHZ001>007-009.
WINTER STORM WARNING FROM 6 PM THIS EVENING TO NOON EDT
THURSDAY FOR NHZ008-010.
WINTER WEATHER ADVISORY FROM 6 PM THIS EVENING TO NOON EDT
THURSDAY FOR NHZ013-014.
MARINE...GALE WARNING FROM 4 PM THIS AFTERNOON TO 8 PM EDT THURSDAY FOR
ANZ150>154.
&&
$$
NEAR/SHORT TERM...MLE
AREA FORECAST DISCUSSION
NWS GRAY ME
710 AM EDT WED MAR 12 2014
.SYNOPSIS...
LOW PRESSURE WILL MOVE NORTHEAST OUT OF THE OHIO VALLEY TODAY AND
WILL RAPIDLY INTENSIFY AS IT MOVES OFF THE NEW ENGLAND COAST
OVERNIGHT. LOW PRESSURE WILL CONTINUE NORTHEAST THROUGH THE
MARITIMES ON THURSDAY. A RIDGE OF HIGH PRESSURE WILL BUILD IN FROM
THE WEST THURSDAY NIGHT. HIGH PRESSURE WILL MOVE OFFSHORE ON
FRIDAY AS A WARM FRONT LIFTS INTO THE REGION FROM THE SOUTHWEST. A
COLD FRONT WILL APPROACH FROM THE WEST FRIDAY NIGHT AND SATURDAY
AND WILL SLOWLY CROSS THE REGION SATURDAY NIGHT. HIGH PRESSURE
WILL GRADUALLY BUILD IN FROM THE WEST SUNDAY THROUGH MONDAY.
&&
.NEAR TERM /UNTIL 6 PM THIS EVENING/...
7 AM UPDATE...NO SIGNIFICANT CHANGES TO THE GOING FORECAST. JUST A
FEW MINOR ADJUSTMENTS BASED ON LATEST TRENDS IN OBSERVATIONAL DATA.
THINGS SEEM TO BE GOING AS PLANNED AT THE MOMENT. HOWEVER...ITS A
VERY CHANGABLE SITUATION TODAY SOUTH OF THE MOUNTAINS...SO STAY
TUNED FOR FORECAST UPDATES.
PREVIOUSLY...
VERY TRICKY AND LOW CONFIDENCE FORECAST CONTINUES FOR THE COASTAL
PLAIN TODAY. MUCH OF THE 00Z GUIDANCE HAS WARMED FOR
TODAY...BASICALLY CATCHING UP TO WHAT THE ECMWF HAS BEEN SHOWING
FOR AWHILE NOW. THIS HAS RESULTED IN THE ADJUSTMENT OF THE TIMING
OF SOME OF THE WARNINGS AND ADVISORIES.
AS A RESULT OF THE COLUMN WARNING ACROSS SOUTHERN AREAS
TODAY...THE MID LEVEL FRONTOGENETICAL ZONE WILL BE PUSHED NORTH.
THE RESULT SHOULD BE A NORTHWARD PUSH OF THE MODERATE TO HEAVY
PRECIPITATION INTO THE MOUNTAINS AND FOOTHILLS FOR MUCH OF THE
DAY. IN FACT...THE LATEST HRRR AND RAP HAVE LITTLE IN THE WAY OF
PRECIPITATION TODAY ACROSS SOUTHERNMOST PORTIONS OF NH AND ME
THROUGH AT LEAST 21Z. THEREFORE...THE LIGHT NATURE OF THE
PRECIPITATION COMBINED WITH A WARMING COLUMN SHOULD NOT ALLOW FOR
WIDESPREAD HAZARDOUS WEATHER CONDITIONS THERE DURING MUCH OF THE
DAY TODAY NEAR THE COAST. IN FACT...JUST A LIGHT TO OCCASIONALLY
MODERATE RAIN MIXED WITH SNOW AND SLEET AT TIMES SEEMS TO BE THE
MOST LIKELY SCENARIO ALONG COASTAL ME SOUTHWESTWARD TO MUCH OF
SOUTHERN NH. CONSIDERED DOWNGRADING THE WARNINGS TO ADVISORIES IN
THESE AREAS...BUT SINCE COLD AIR IS EXPECTED TO RAPIDLY MOVE IN
TONIGHT RESULTING IN A HEAVY MIXED BAG OF SNOW...SLEET...AND
FREEZING RAIN COMBINED WITH STRONG WINDS...FELT IS WAS BEST TO
KEEP THE WARNINGS GOING. A FLASH FREEZE WILL BE POSSIBLE THIS
EVENING AT LOCATIONS THAT HOLD ONTO ABOVE FREEZING TEMPS TODAY.
WE/VE RADIATED DOWN TO AROUND FREEZING EARLY THIS WEDNESDAY
MORNING...AND THIS SHOULD RESULT IN SOME FROZEN/FREEZING
PRECIPITATION EARLY ON. MAY ADDRESS THIS WITH AN SPS DEPENDING ON
HOW THE RADAR LOOKS IN A FEW HOURS.
IN THE MOUNTAINS AND FOOTHILLS...EXPECT HEAVY SNOW
TODAY...POSSIBLY MIXED WITH SLEET. IN THE TRANSITION AREA BETWEEN
THE FOOTHILLS AND THE COASTAL PLAIN /EG...INTERIOR CUMBERLAND
COUNTY ME/...EXPECT OSCILLATING PRECIPITATION TYPES MAKING FOR
HAZARDOUS DRIVING CONDITIONS TODAY.
A VERY CHANGEABLE SITUATION IS EXPECTED TODAY...AND THEREFORE
FORECAST ADJUSTMENTS ARE LIKELY.
&&
.SHORT TERM /6 PM THIS EVENING THROUGH 6 PM THURSDAY/...
AS STRONG LOW PRESSURE PULLS INTO THE GULF OF MAINE TONIGHT...LOW
LEVEL COLD AIR SHOULD RACE SOUTHEASTWARD TOWARD THE COAST. THIS
SHOULD CHANGE ANY RAIN OR RAIN/SLEET MIX TO A MIX OF
SNOW...SLEET...AND FREEZING RAIN. CURRENTLY FORECASTING UP TO A
QUARTER INCH OF ICE FOR THE COASTAL PLAIN TONIGHT BEFORE THE
COLUMN COOLS ENOUGH TO SUPPORT ALL SNOW. WINDS ARE EXPECTED TO
INCREASE THIS EVENING AND GUST UP TO 45 MPH. THEREFORE...AREAS
THAT SEE A WET SNOW AND/OR FREEZING RAIN MAY HAVE TO DEAL WITH
POWER OUTAGES AS THE NIGHT WEARS ON. THD SNOW SHOULD TAPER OFF
THURSDAY MORNING AND END BY EARLY AFTERNOON...LEAVING VERY COLD
AIR IN THE STORMS WAKE FOR THE BALANCE OF THE DAY.
&&
.LONG TERM /THURSDAY NIGHT THROUGH TUESDAY/...
LOW PRESSURE WILL PULL AWAY THURSDAY NIGHT FOLLOWED BY A NARROW
RIDGE OF HIGH PRESSURE. EXPECT ANY LINGERING SNOW SHOWERS TO QUICKLY
COME TO AN END THURSDAY EVENING AND SKIES WILL CLEAR AS HIGH
PRESSURE BUILDS IN FROM THE WEST. TEMPERATURES WILL ONCE AGAIN END
UP WELL BELOW NORMAL WITH LOWS OF ZERO TO AROUND 10 BELOW IN THE
NORTH AND 5 BELOW TO 5 ABOVE IN THE SOUTH.
LOW PRESSURE CROSSING SOUTHERN CANADA FRIDAY WILL LIFT A WARM FRONT
INTO THE REGION IN THE AFTERNOON. WILL SEE INCREASING CLOUDS WITH A
CHANCE OF SNOW SHOWERS...MAINLY IN NORTHWEST ZONES DURING THE LATE
MORNING AND AFTERNOON. HIGH TEMPS WILL RANGE THROUGH THE 20S NORTH
AND IN THE LOWER TO MID 30S SOUTH.
PRE-FRONTAL TROUGH WILL BRING A CHANCE SNOW SHOWERS IN THE NORTH AND
RAIN SHOWERS OR MIXED PRECIP IN THE SOUTH FRIDAY NIGHT. NOT A LOT
FORCING WITH THIS BOUNDARY SO NOT LOOKING FOR MUCH IN THE WAY OF QPF.
TROUGH PUSHES OFFSHORE EARLY SATURDAY MORNING AND SKIES SHOULD
BECOME PARTLY TO MOSTLY SUNNY. COLD FRONT APPROACHING FROM THE
NORTHWEST WILL BRING MORE CLOUDS INTO NORTHWEST ZONES IN THE
AFTERNOON. EXPECT HIGHS RANGING THROUGH THE 40S.
COLD FRONT WILL SLOWLY CROSS THE REGION SATURDAY NIGHT WITH LITTLE
IF ANY FANFARE. WILL SEE THICKENING CLOUDS AND A CHANCE OF SNOW
SHOWERS IN THE MOUNTAINS AND JUST VARIABLE CLOUDINESS ELSEWHERE.
TEMPERATURES BY SUNDAY MORNING WILL RANGE FROM THE TEENS NORTH TO
THE LOWER TO MID 20S SOUTH.
SUNDAY LOOKING BREEZY AND COOLER BEHIND THE FRONT AS HIGH PRESSURE
BUILDING IN FROM THE WEST SETS UP A TIGHT NORTHWESTERLY GRADIENT
ACROSS THE REGION. EXPECT CLOUDS TO HANG TOUGH IN THE CONNECTICUT
VALLEY AND THE MOUNTAINS THROUGH THE DAY WITH A MIX OF SUN AND
CLOUDS ELSEWHERE.
HIGH PRESSURE WILL CONTINUE TO BUILD IN FROM THE WEST SUNDAY NIGHT
THROUGH MONDAY. HIGH PRESSURE WILL GRADUALLY SLIP OFFSHORE SOUTH OF
NEW ENGLAND MONDAY NIGHT AS A WEAK WARM FRONT LIFTS NORTH INTO
SOUTHERN CANADA NORTHWEST OF THE FORECAST AREA. WILL SEE INCREASING
CLOUDS OVERNIGHT AND POSSIBLY A FEW SNOW SHOWERS ON TUESDAY AS WEAK
OVER-RUNNING BRUSHES NORTHWEST ZONES.
&&
.AVIATION /07Z WEDNESDAY THROUGH SUNDAY/...
SHORT TERM...VFR CONDITIONS WILL DETERIORATE TO IFR OR LOWER BY
THIS AFTERNOON IN SNOW OR MIXED PRECIPITATION. LIFR CONDITIONS ARE
EXPECTED THROUGH TONIGHT INTO THURSDAY MORNING. WIND GUSTS UP TO
40 KT ARE EXPECTED TONIGHT WHICH WILL RESULT IN MECHANICAL
TURBULENCE.
LONG TERM...VFR THURSDAY NIGHT THROUGH SUNDAY.
&&
.MARINE...
SHORT TERM...GALES THIS AFTERNOON THROUGH THURSDAY IN ASSOCIATION
WITH COASTAL STORM.
LONG TERM...SCA`S LIKELY THURSDAY NIGHT AND FRIDAY NIGHT. GALES
POSSIBLE SUNDAY NIGHT.
&&
.GYX WATCHES/WARNINGS/ADVISORIES...
ME...WINTER STORM WARNING FROM 8 AM THIS MORNING TO NOON EDT
THURSDAY FOR MEZ007>009-012>014.
WINTER STORM WARNING FROM 11 AM THIS MORNING TO NOON EDT
THURSDAY FOR MEZ018>022.
WINTER STORM WARNING FROM 6 PM THIS EVENING TO NOON EDT
THURSDAY FOR MEZ024>028.
WINTER WEATHER ADVISORY FROM 6 PM THIS EVENING TO NOON EDT
THURSDAY FOR MEZ023.
NH...WINTER STORM WARNING FROM 8 AM THIS MORNING TO NOON EDT
THURSDAY FOR NHZ001>007-009.
WINTER STORM WARNING FROM 6 PM THIS EVENING TO NOON EDT
THURSDAY FOR NHZ008-010.
WINTER WEATHER ADVISORY FROM 6 PM THIS EVENING TO NOON EDT
THURSDAY FOR NHZ013-014.
MARINE...GALE WARNING FROM 4 PM THIS AFTERNOON TO 8 PM EDT THURSDAY FOR
ANZ150>154.
&&
$$
NEAR/SHORT TERM...MLE
AREA FORECAST DISCUSSION
NWS GRAY ME
358 AM EDT WED MAR 12 2014
.SYNOPSIS...
LOW PRESSURE WILL MOVE NORTHEAST OUT OF THE OHIO VALLEY TODAY AND
WILL RAPIDLY INTENSIFY AS IT MOVES OFF THE NEW ENGLAND COAST
OVERNIGHT. LOW PRESSURE WILL CONTINUE NORTHEAST THROUGH THE
MARITIMES ON THURSDAY. A RIDGE OF HIGH PRESSURE WILL BUILD IN FROM
THE WEST THURSDAY NIGHT. HIGH PRESSURE WILL MOVE OFFSHORE ON
FRIDAY AS A WARM FRONT LIFTS INTO THE REGION FROM THE SOUTHWEST. A
COLD FRONT WILL APPROACH FROM THE WEST FRIDAY NIGHT AND SATURDAY
AND WILL SLOWLY CROSS THE REGION SATURDAY NIGHT. HIGH PRESSURE
WILL GRADUALLY BUILD IN FROM THE WEST SUNDAY THROUGH MONDAY.
&&
.NEAR TERM /UNTIL 6 PM THIS EVENING/...
VERY TRICKY AND LOW CONFIDENCE FORECAST CONTINUES FOR THE COASTAL
PLAIN TODAY. MUCH OF THE 00Z GUIDANCE HAS WARMED FOR
TODAY...BASICALLY CATCHING UP TO WHAT THE ECMWF HAS BEEN SHOWING
FOR AWHILE NOW. THIS HAS RESULTED IN THE ADJUSTMENT OF THE TIMING
OF SOME OF THE WARNINGS AND ADVISORIES.
AS A RESULT OF THE COLUMN WARNING ACROSS SOUTHERN AREAS
TODAY...THE MID LEVEL FRONTOGENETICAL ZONE WILL BE PUSHED NORTH.
THE RESULT SHOULD BE A NORTHWARD PUSH OF THE MODERATE TO HEAVY
PRECIPITATION INTO THE MOUNTAINS AND FOOTHILLS FOR MUCH OF THE
DAY. IN FACT...THE LATEST HRRR AND RAP HAVE LITTLE IN THE WAY OF
PRECIPITATION TODAY ACROSS SOUTHERNMOST PORTIONS OF NH AND ME
THROUGH AT LEAST 21Z. THEREFORE...THE LIGHT NATURE OF THE
PRECIPITATION COMBINED WITH A WARMING COLUMN SHOULD NOT ALLOW FOR
WIDESPREAD HAZARDOUS WEATHER CONDITIONS THERE DURING MUCH OF THE
DAY TODAY NEAR THE COAST. IN FACT...JUST A LIGHT TO OCCASIONALLY
MODERATE RAIN MIXED WITH SNOW AND SLEET AT TIMES SEEMS TO BE THE
MOST LIKELY SCENARIO ALONG COASTAL ME SOUTHWESTWARD TO MUCH OF
SOUTHERN NH. CONSIDERED DOWNGRADING THE WARNINGS TO ADVISORIES IN
THESE AREAS...BUT SINCE COLD AIR IS EXPECTED TO RAPIDLY MOVE IN
TONIGHT RESULTING IN A HEAVY MIXED BAG OF SNOW...SLEET...AND
FREEZING RAIN COMBINED WITH STRONG WINDS...FELT IS WAS BEST TO
KEEP THE WARNINGS GOING. A FLASH FREEZE WILL BE POSSIBLE THIS
EVENING AT LOCATIONS THAT HOLD ONTO ABOVE FREEZING TEMPS TODAY.
WE/VE RADIATED DOWN TO AROUND FREEZING EARLY THIS WEDNESDAY
MORNING...AND THIS SHOULD RESULT IN SOME FROZEN/FREEZING
PRECIPITATION EARLY ON. MAY ADDRESS THIS WITH AN SPS DEPENDING ON
HOW THE RADAR LOOKS IN A FEW HOURS.
IN THE MOUNTAINS AND FOOTHILLS...EXPECT HEAVY SNOW
TODAY...POSSIBLY MIXED WITH SLEET. IN THE TRANSITION AREA BETWEEN
THE FOOTHILLS AND THE COASTAL PLAIN /EG...INTERIOR CUMBERLAND
COUNTY ME/...EXPECT OSCILLATING PRECIPITATION TYPES MAKING FOR
HAZARDOUS DRIVING CONDITIONS TODAY.
A VERY CHANGEABLE SITUATION IS EXPECTED TODAY...AND THEREFORE
FORECAST ADJUSTMENTS ARE LIKELY.
&&
.SHORT TERM /6 PM THIS EVENING THROUGH 6 PM THURSDAY/...
AS STRONG LOW PRESSURE PULLS INTO THE GULF OF MAINE TONIGHT...LOW
LEVEL COLD AIR SHOULD RACE SOUTHEASTWARD TOWARD THE COAST. THIS
SHOULD CHANGE ANY RAIN OR RAIN/SLEET MIX TO A MIX OF
SNOW...SLEET...AND FREEZING RAIN. CURRENTLY FORECASTING UP TO A
QUARTER INCH OF ICE FOR THE COASTAL PLAIN TONIGHT BEFORE THE
COLUMN COOLS ENOUGH TO SUPPORT ALL SNOW. WINDS ARE EXPECTED TO
INCREASE THIS EVENING AND GUST UP TO 45 MPH. THEREFORE...AREAS
THAT SEE A WET SNOW AND/OR FREEZING RAIN MAY HAVE TO DEAL WITH
POWER OUTAGES AS THE NIGHT WEARS ON. THD SNOW SHOULD TAPER OFF
THURSDAY MORNING AND END BY EARLY AFTERNOON...LEAVING VERY COLD
AIR IN THE STORMS WAKE FOR THE BALANCE OF THE DAY.
&&
.LONG TERM /THURSDAY NIGHT THROUGH TUESDAY/...
LOW PRESSURE WILL PULL AWAY THURSDAY NIGHT FOLLOWED BY A NARROW
RIDGE OF HIGH PRESSURE. EXPECT ANY LINGERING SNOW SHOWERS TO QUICKLY
COME TO AN END THURSDAY EVENING AND SKIES WILL CLEAR AS HIGH
PRESSURE BUILDS IN FROM THE WEST. TEMPERATURES WILL ONCE AGAIN END
UP WELL BELOW NORMAL WITH LOWS OF ZERO TO AROUND 10 BELOW IN THE
NORTH AND 5 BELOW TO 5 ABOVE IN THE SOUTH.
LOW PRESSURE CROSSING SOUTHERN CANADA FRIDAY WILL LIFT A WARM FRONT
INTO THE REGION IN THE AFTERNOON. WILL SEE INCREASING CLOUDS WITH A
CHANCE OF SNOW SHOWERS...MAINLY IN NORTHWEST ZONES DURING THE LATE
MORNING AND AFTERNOON. HIGH TEMPS WILL RANGE THROUGH THE 20S NORTH
AND IN THE LOWER TO MID 30S SOUTH.
PRE-FRONTAL TROUGH WILL BRING A CHANCE SNOW SHOWERS IN THE NORTH AND
RAIN SHOWERS OR MIXED PRECIP IN THE SOUTH FRIDAY NIGHT. NOT A LOT
FORCING WITH THIS BOUNDARY SO NOT LOOKING FOR MUCH IN THE WAY OF QPF.
TROUGH PUSHES OFFSHORE EARLY SATURDAY MORNING AND SKIES SHOULD
BECOME PARTLY TO MOSTLY SUNNY. COLD FRONT APPROACHING FROM THE
NORTHWEST WILL BRING MORE CLOUDS INTO NORTHWEST ZONES IN THE
AFTERNOON. EXPECT HIGHS RANGING THROUGH THE 40S.
COLD FRONT WILL SLOWLY CROSS THE REGION SATURDAY NIGHT WITH LITTLE
IF ANY FANFARE. WILL SEE THICKENING CLOUDS AND A CHANCE OF SNOW
SHOWERS IN THE MOUNTAINS AND JUST VARIABLE CLOUDINESS ELSEWHERE.
TEMPERATURES BY SUNDAY MORNING WILL RANGE FROM THE TEENS NORTH TO
THE LOWER TO MID 20S SOUTH.
SUNDAY LOOKING BREEZY AND COOLER BEHIND THE FRONT AS HIGH PRESSURE
BUILDING IN FROM THE WEST SETS UP A TIGHT NORTHWESTERLY GRADIENT
ACROSS THE REGION. EXPECT CLOUDS TO HANG TOUGH IN THE CONNECTICUT
VALLEY AND THE MOUNTAINS THROUGH THE DAY WITH A MIX OF SUN AND
CLOUDS ELSEWHERE.
HIGH PRESSURE WILL CONTINUE TO BUILD IN FROM THE WEST SUNDAY NIGHT
THROUGH MONDAY. HIGH PRESSURE WILL GRADUALLY SLIP OFFSHORE SOUTH OF
NEW ENGLAND MONDAY NIGHT AS A WEAK WARM FRONT LIFTS NORTH INTO
SOUTHERN CANADA NORTHWEST OF THE FORECAST AREA. WILL SEE INCREASING
CLOUDS OVERNIGHT AND POSSIBLY A FEW SNOW SHOWERS ON TUESDAY AS WEAK
OVER-RUNNING BRUSHES NORTHWEST ZONES.
&&
.AVIATION /07Z WEDNESDAY THROUGH SUNDAY/...
SHORT TERM...VFR CONDITIONS WILL DETERIORATE TO IFR OR LOWER BY
THIS AFTERNOON IN SNOW OR MIXED PRECIPITATION. LIFR CONDITIONS ARE
EXPECTED THROUGH TONIGHT INTO THURSDAY MORNING. WIND GUSTS UP TO
40 KT ARE EXPECTED TONIGHT WHICH WILL RESULT IN MECHANICAL
TURBULENCE.
LONG TERM...VFR THURSDAY NIGHT THROUGH SUNDAY.
&&
.MARINE...
SHORT TERM...GALES THIS AFTERNOON THROUGH THURSDAY IN ASSOCIATION
WITH COASTAL STORM.
LONG TERM...SCA`S LIKELY THURSDAY NIGHT AND FRIDAY NIGHT. GALES
POSSIBLE SUNDAY NIGHT.
&&
.GYX WATCHES/WARNINGS/ADVISORIES...
ME...WINTER STORM WARNING FROM 8 AM THIS MORNING TO NOON EDT
THURSDAY FOR MEZ007>009-012>014.
WINTER STORM WARNING FROM 11 AM THIS MORNING TO NOON EDT
THURSDAY FOR MEZ018>022.
WINTER STORM WARNING FROM 6 PM THIS EVENING TO NOON EDT
THURSDAY FOR MEZ024>028.
WINTER WEATHER ADVISORY FROM 6 PM THIS EVENING TO NOON EDT
THURSDAY FOR MEZ023.
NH...WINTER STORM WARNING FROM 8 AM THIS MORNING TO NOON EDT
THURSDAY FOR NHZ001>007-009.
WINTER STORM WARNING FROM 6 PM THIS EVENING TO NOON EDT
THURSDAY FOR NHZ008-010.
WINTER WEATHER ADVISORY FROM 6 PM THIS EVENING TO NOON EDT
THURSDAY FOR NHZ013-014.
MARINE...GALE WARNING FROM 4 PM THIS AFTERNOON TO 8 PM EDT THURSDAY FOR
ANZ150>154.
&&
$$
NEAR/SHORT TERM...MLE
AREA FORECAST DISCUSSION
NWS BALTIMORE MD/WASHINGTON DC
530 PM EDT WED MAR 12 2014
.SYNOPSIS...
A VERY STRONG LOW PRESSURE CENTER AND ITS ASSOCIATED COLD FRONT WILL
PASS THROUGH THE MID-ATLANTIC STATES BY THIS EVENING. AN UPPER LEVEL
TROUGH WILL MOVE ACROSS THE AREA TONIGHT...THEN CANADIAN HIGH
PRESSURE WILL BUILD THROUGH THURSDAY NIGHT AND MOVE OFF THE COAST
FRIDAY. ANOTHER WEAK DISTURBANCE MOVES THROUGH TO START THE WEEKEND.
FOR THE SECOND HALF OF THE WEEKEND...HIGH PRESSURE WILL BUILD OVER
THE GREAT LAKES WHILE ANOTHER UPPER DISTURBANCE PASSES THROUGH THE
MID-ATLANTIC.
&&
.NEAR TERM /THROUGH THURSDAY/...
SEVERE THUNDERSTORM WATCH #28 HAS BEEN ISSUED FOR COUNTIES EAST OF
THE BLUE RIDGE EXCLUDING THE CENTRAL FOOTHILLS...WHERE THE NARROW
LINE OF CONVECTION ALONG THE FRONT HAS ALREADY PASSED THRU. PER
LATEST RADAR TRENDS AND HRRR SIM REFLECTIVITY FORECAST...EXPECT
THIS LINE TO INTENSIFY A BIT OVER THE NEXT COUPLE OF HRS AS IT
REACHES THE I-95 CORRIDOR AND CHESAPEAKE BAY. THE LINE SHOULD
CLEAR THE CHSPK BAY BETWEEN 730 PM AND 830 PM.
PREVIOUS DISCUSSION...
983/984 MB SFC LOW IS NOW IN SRN PA AND THIN CONVECTIVE LINE HAS
EVOLVED FROM THAT LOW SWD ACROSS WV...FAR SWRN VA...AND ERN TN.
CLOUDS ARE TRYING TO BREAK AHEAD OF THIS LINE BUT ARE HAVING
TROUBLE AT THE MOMENT NORTH OF THE VA/NC BORDER. EVEN WITH THE
CLOUD COVER...TEMPS AND DEWPOINTS HAVE SURGED...WITH TEMPS IN THE
MID/UPPER 60S AND DEWPOINTS IN THE 50S SOUTH OF THE FRONT. AN
EARLIER WIND SURGE LED TO 40-50 KNOT GUSTS IN LOUDOUN AND
MONTGOMERY COUNTIES...BUT THIS APPEARS TO HAVE SINCE SUBSIDED. THE
FRONT WILL PASS THROUGH THIS EVENING...USHERING IN MARKEDLY COLDER
AIR.
LETS GO THREAT BY THREAT. FIRST...THE STORM THREAT FOR THIS
AFTERNOON. THE LINE WILL CROSS THE CWA BETWEEN 3 PM AND 8 PM. SO FAR
THERE HAS BEEN LITTLE LIGHTNING IN THIS ACTIVITY AND WIND GUSTS HAVE
NOT REALLY BEEN ANY MORE SIGNIFICANT THAN THE GRADIENT WIND.
REGARDLESS...THIS ACTIVITY IS MOVING INTO A SLIGHTLY WARMER
ENVIRONMENT AS IT GETS HERE...SO IT WILL HAVE TO BE MONITORED. AND
AS WE HAVE SEEN...THE WINDS ARE STRONG ENOUGH ALREADY AS IT IS.
NEXT IS THE WIND THREAT. A WIND ADVISORY STARTS AT 6 PM AND HAS BEEN
EXPANDED TO INCLUDE THE ENTIRE FORECAST AREA. WINDS ARE ALREADY
WIDESPREAD GUSTING TO 25 TO 35 KNOTS AND THIS WILL PICK UP EVEN
FURTHER SINCE THE PRESSURE GRADIENT IS ACTUALLY STRONGER BEHIND THE
FRONT. SOME OF THE GUIDANCE INDICATES WIND GUSTS EXCEEDING 50 KNOTS
THIS EVENING...ESPECIALLY AT HIGHER ELEVATIONS. THEREFORE...THE
POTENTIAL FOR A SHORT-LEAD-TIME UPGRADE TO HIGH WIND WARNING DOES
EXIST BEHIND THE FRONT. WINDS WILL STAY QUITE GUSTY THROUGH THE
MORNING HOURS ON THURSDAY AND THEN VERY GRADUALLY SUBSIDE DURING THE
AFTERNOON.
SHARPLY COLDER TEMPERATURES AND WIND CHILLS ARE ANOTHER THREAT.
TEMPS SHOULD DROP 30-40 DEGREES IN ABOUT FOUR HOURS AS THE FRONT
PASSES...WITH LOWS TONIGHT RANGING FROM THE SINGLE DIGITS IN THE
HIGHLANDS...TO 20-25 EAST OF THE BLUE RIDGE. BETWEEN A LACK OF
RAIN...AND PLENTY OF WIND...THERE PROBABLY WILL NOT BE MUCH IN THE
WAY OF ICING PROBLEMS FOR THE MORNING COMMUTE. WIND CHILLS WILL BE
NO HIGHER THAN THE SINGLE DIGITS AREAWIDE...AND BELOW ZERO IN MANY
LOCATIONS IN THE HIGHLANDS AND NORTHERN MARYLAND. WIND CHILLS COULD
APPROACH 20 BELOW ZERO IN SPOTS IN THE HIGHLANDS. TEMPERATURES WILL
REMAIN NEAR OR BELOW FREEZING IN MOST AREAS ON THURSDAY.
UPSLOPE SNOW WILL DEVELOP WEST OF THE ALLEGHENY FRONT THIS EVENING
AND CONTINUE THROUGH MUCH OF THE NIGHT. CURRENT THINKING IS MAYBE A
COUPLE OF INCHES OF SNOW...BUT THAT AMOUNT COULD VARY GREATLY
DEPENDING ON THE LENGTH OF TIME SNOW OCCURS AND HOW QUICKLY TEMPS
FALL BELOW FREEZING BEHIND THE FRONT. A WINTER WEATHER ADVISORY
CANNOT BE RULED OUT FOR THESE AREAS. ELSEWHERE...SNOW CHANCES APPEAR
SMALL...IF ANY.
FOR DETAILS ON THE MARINE/COASTAL FLOOD/FIRE WEATHER THREATS...SEE
THEIR RESPECTIVE SECTIONS OF THIS DISCUSSION.
&&
.SHORT TERM /THURSDAY NIGHT THROUGH FRIDAY/...
WINDS WILL DIMINISH THURSDAY EVENING AS HIGH PRESSURE MOVES
OVERHEAD. THE LIGHTER WINDS AND A MOSTLY CLEAR SKY SHOULD ALLOW
TEMPERATURES TO PLUMMET THURSDAY EVENING...WITH OVERNIGHT LOWS
GENERALLY AROUND 20 EXPECTED...EXCEPT 20 TO 25 IN THE INNER CITIES.
MILDER WEATHER IS EXPECTED FRIDAY AS COLD HIGH PRESSURE DEPARTS TO
THE EAST AND SOUTHERLY RETURN FLOW SETS UP. HIGHS IN THE 50S TO NEAR
60 ARE EXPECTED.
A COLD FRONT WILL APPROACH THE AREA FROM THE GREAT LAKES FRIDAY
NIGHT INTO SATURDAY...BUT AT THIS TIME DOES NOT APPEAR TO HAVE MUCH
MOISTURE WITH IT. THE BEST CHANCE OF PRECIPITATION WILL BE OVER THE
POTOMAC HIGHLANDS WHERE A FEW RAIN OR SNOW SHOWERS ARE POSSIBLE.
COLDER AIR LAGS BEHIND THE FRONT...SO SATURDAY SHOULD BE ANOTHER
MILD DAY WITH HIGH TEMPERATURES SIMILAR TO THAT OBSERVED ON FRIDAY.
&&
.LONG TERM /FRIDAY NIGHT THROUGH WEDNESDAY/...
SUNDAY WILL LIKELY BE THE NICEST DAY OF THE LONG TERM PERIOD WITH
HIGH TEMPS NEAR 50 DEGREES...NEAR NORMAL FOR THIS TIME OF YEAR...AND
PARTLY SUNNY SKIES. HIGH PRESSURE OVER THE GREAT LAKES WILL KEEP
LIGHT WINDS OUT OF THE NORTH DURING THE DAY. THE FRONTAL BOUNDARY
THAT CROSSED OUR AREA SATURDAY WILL STALL OFF OF THE EAST COAST
SUNDAY NIGHT AND MODAL AGREEMENT IS VERY LOW ON WHAT WILL HAPPEN
NEXT.
UPPER LEVEL TROUGHING OVER THE GREAT LAKES SHOULD ENCOURAGE THE
FORMATION OF A LOW PRESSURE WAVE ALONG THE STALLED BOUNDARY OVER THE
GULF COAST. THIS WAVE SHOULD MOVE UP THE EAST COAST AS THE UPPER
LEVEL TROUGH LIFTS THROUGH THE BEGINNING OF THE WORKWEEK. TRACK AND
TIMING OF THIS COASTAL LOW IS STILL VERY UNCERTAIN...AS THERE IS
VERY HIGH VARIABILITY WITHIN ENSEMBLE MEMBERS OF GLOBAL MODELS.
TRACK WILL PLAY A LARGE ROLL IN PTYPE AND LOCAL IMPACTS. ASSUMING
THAT LOW TRACKS UP THE COAST AND WE REMAIN IN THE COLD SECTOR OF THE
STORM...WINTRY PRECIP IS A REALISTIC EXPECTATION. HAVE FORECAST
HIGHS NEAR 40 AND LOWS IN THE UPPER 20S FOR NEXT WEEK WITH LOW END
CHANCE POPS THROUGH THE ENTIRE BEGINNING OF THE WORKWEEK. HAVE
STARTED PTYPE AS RAIN AND INCLUDED POSSIBILITY OF SNOW OVERNIGHT
MONDAY TO ACCOUNT FOR UNCERTAINTY OF LOW TRACK AND DYNAMICS.
&&
.AVIATION /22Z WEDNESDAY THROUGH MONDAY/...
THIN LINE OF SHRA/POSSIBLE TSRA WILL MOVE THROUGH THE TERMINALS
BETWEEN 20 UTC AND 23 UTC. RELATIVELY BRIEF VSBY/CIG RESTRICTIONS
ARE LIKELY AS THIS LINE PASSES. BIG STORY FOR AVIATION WILL BE THE
GUSTY AND PERSISTENT WIND. WINDS OUT OF THE SOUTH WILL SHIFT OUT OF
THE WEST AND THEN NORTHWEST AS THE FRONT PASSES...AND LIKELY BECOME
EVEN GUSTIER THAN THEY HAVE BEEN. WIND GUSTS OVER 40 KTS ARE LIKELY
AT TIMES. WINDS WILL GRADUALLY SUBSIDE ON THURSDAY. ASIDE FROM THE
CONVECTIVE LINE...VFR CIGS/VSBYS ARE EXPECTED.
VFR CONDITIONS ARE EXPECTED THURSDAY NIGHT THROUGH SATURDAY...WITH
THE EXCEPTION OF TERMINALS OVER THE POTOMAC HIGHLANDS WHERE SUB-VFR
CONDITIONS ARE POSSIBLE IN RAIN OR SNOW SHOWERS. GUSTY NORTHWEST
WINDS OF 15 TO 20 KNOTS WITH GUSTS TO 25 KNOTS ARE EXPECTED THURSDAY
EVENING...BECOMING LIGHT AND VARIABLE AFTER MIDNIGHT. SOUTHERLY
WINDS AROUND 10 KNOTS ARE EXPECTED FRIDAY INTO FRIDAY NIGHT WITH
GUSTS TO 20 KNOTS POSSIBLE. WINDS THEN BECOME WEST AROUND 10 KNOTS
SATURDAY.
&&
.MARINE...
EXPANDED THE GALE WARNING TO ALL WATERS...STARTING EARLIER AND
ENDING LATER. GUSTS OVER 30 KNOTS ARE ALREADY HAPPENING AND WILL
CONTINUE AND EVEN INTENSIFY AS THE FRONT PASSES. GALE-LEVEL GUSTS
WILL CONTINUE THROUGH MOST OF THURSDAY...ESPECIALLY OVER THE MORE
OPEN WATERS OF THE LOWER TIDAL POTOMAC AND MARYLAND CHESAPEAKE BAY.
WINDS WILL GRADUALLY SUBSIDE DURING THE LATE AFTERNOON THURSDAY.
SCA CONDITIONS ARE EXPECTED THURSDAY EVENING IN A GUSTY NORTHWEST
FLOW. A BRIEF LULL IN WINDS IS FORECAST THROUGH FRIDAY
MORNING...WITH GUSTY SOUTHERLY FLOW BRINGING ANOTHER ROUND OF SCA
WINDS FRIDAY AFTERNOON AND EVENING...BEFORE WINDS SLACKEN OFF
OVERNIGHT FRIDAY NIGHT INTO SATURDAY MORNING.
A SMALL CRAFT ADVISORY MAY BE NECESSARY BEGINNING SUNDAY NIGHT AS
A COASTAL LOW MAY MOVE NEAR THE AREA.
&&
.FIRE WEATHER...
ABUNDANTLY DRY AIR WILL ACCOMPANY THE ARCTIC AIRMASS INVADING THE
AREA ON THURSDAY...WITH DEW POINTS BELOW ZERO EXPECTED. THIS WILL
RESULT IN RELATIVE HUMIDITY VALUES BOTTOMING OUT AT 20 TO 25 PERCENT
THURSDAY AFTERNOON...ESPECIALLY EAST OF THE BLUE RIDGE. THE DRY AND
WINDY CONDITIONS MAY RESULT IN AN ENHANCED FIRE SPREAD POTENTIAL. A
FIRE WEATHER WATCH HAS BEEN ISSUED FOR ALL OUR VIRGINIA COUNTIES
EAST OF THE BLUE RIDGE IN COORDINATION WITH NEIGHBORING OFFICES AND
FIRE OFFICIALS. THE REMAINDER OF THE AREA WILL BE FURTHER CONSIDERED
FOR SPS AND POTENTIAL FIRE WEATHER HEADLINES TONIGHT OR TOMORROW.
&&
.TIDES/COASTAL FLOODING...
COASTAL FLOOD ADVISORY HAS EXPIRED. WITH THE ANNAPOLIS BUOY
REMAINING JUST BELOW THRESHOLD DURING THE AFTN HIGH TIDE... COASTAL
FLOODING ELSEWHERE UNLIKELY.
WATER LEVELS WILL SHARPLY DECREASE FOLLOWING FRONTAL PASSAGE...AND
A NEGATIVE ANOMALY OVER ONE FOOT IS LIKELY BY THURSDAY AFTERNOON.
&&
.LWX WATCHES/WARNINGS/ADVISORIES...
DC...WIND ADVISORY UNTIL 11 AM EDT THURSDAY FOR DCZ001.
MD...WIND ADVISORY UNTIL 11 AM EDT THURSDAY FOR MDZ003>007-009>011-
013-014-016>018-501-502.
WIND CHILL ADVISORY FROM 11 PM THIS EVENING TO NOON EDT
THURSDAY FOR MDZ501-502.
VA...WIND ADVISORY UNTIL 11 AM EDT THURSDAY FOR VAZ025>031-036>040-
042-050>057-501>504.
WIND CHILL ADVISORY FROM 11 PM THIS EVENING TO NOON EDT
THURSDAY FOR VAZ503-504.
FIRE WEATHER WATCH FROM THURSDAY MORNING THROUGH THURSDAY
AFTERNOON FOR VAZ036>040-042-050>057-501-502.
WV...WIND ADVISORY UNTIL 11 AM EDT THURSDAY FOR WVZ050>053-055-
501>506.
WIND CHILL ADVISORY FROM 11 PM THIS EVENING TO NOON EDT
THURSDAY FOR WVZ501>506.
MARINE...GALE WARNING UNTIL 8 PM EDT THURSDAY FOR ANZ530>534-537>543.
SMALL CRAFT ADVISORY FROM 11 AM TO 8 PM EDT THURSDAY FOR
ANZ535-536.
GALE WARNING UNTIL 11 AM EDT THURSDAY FOR ANZ535-536.
&&
$$
SYNOPSIS...JCE
NEAR TERM...JRK/JCE
SHORT TERM...DFH
LONG TERM...CEB
AVIATION...JCE/CEB/DFH
MARINE...JCE/CEB/DFH
FIRE WEATHER...JCE
TIDES/COASTAL FLOODING...JRK
AREA FORECAST DISCUSSION
NWS GRAND RAPIDS MI
1151 PM EDT THU MAR 13 2014
LATEST UPDATE...
AVIATION
.SYNOPSIS...
ISSUED AT 323 PM EDT THU MAR 13 2014
A CLIPPER TYPE SURFACE LOW WILL TRACK NORTH OF LAKE SUPERIOR
TONIGHT THEN HEAD EAST TOWARD SOUTHERN QUEBEC FRIDAY NIGHT. THAT
WILL BRING A STRONG WARM FRONT THROUGH THE AREA EARLY FRIDAY
MORNING. TEMPERATURES MAY ACTUALLY RISE OVERNIGHT AS THE MUCH
WARMER AIR SURGES IN. THE COLD FRONT TRAILING THE SYSTEM WILL
CROSS SOUTHWEST LOWER MICHIGAN FRIDAY AFTERNOON BRINGING THE COLD
AIR BACK INTO THE REGION THROUGH THE WEEKEND. THERE COULD BE A
PERIOD OF MIXED LIGHT RAIN AND LIGHT SNOW FRIDAY AFTERNOON THAT
WOULD TURN TO FLURRIES FRIDAY NIGHT AS THE COLD AIR COMES IN.
&&
.SHORT TERM...(THIS EVENING THROUGH SATURDAY NIGHT)
ISSUED AT 323 PM EDT THU MAR 13 2014
THE MAIN ISSUE WITH THIS FORECAST IS JUST HOW WARM DOES IT GET
FRIDAY AS YET ANOTHER STRONG SURGE OF WARM AIR MOVES IN OVER OUR
DEEP SNOW COVER. THERE IS THE POTENTIAL FOR SOME SPRINKLES OR
FLURRIES NEAR AND NORTH OF ROUTE 10 THIS EVENING JUST AHEAD OF THE
WARM FRONT. ALSO A BETTER SHOT AT LIGHT PRECIPITATION FRIDAY
AFTERNOON INTO EARLY SATURDAY AS THE COLD AIR COMES BACK IN ONCE
AGAIN.
CURRENT RADAR LOOPS SHOW SNOW FALLING FROM A MID CLOUD DECK OVER
EASTERN LAKE MICHIGAN HOWEVER THE AIR BELOW THIS IS VERY DRY SO I
DO NOT BELIEVE THIS CAN REACH THE GROUND. I DID NOT PUT POP FOR
THIS SINCE EVEN IF IT DOES HAPPEN IT WOULD NOT BE MEASURABLE.
THE NEXT ISSUE IS TEMPERATURES... JUST WHAT WILL THEY DO?
CURRENTLY WE HAVE TEMPERATURES IN THE 50S IN IOWA AND EVEN IN
EASTERN WISCONSIN LOWER 30S ARE COMMON. DEW POINTS ARE IN THE MID
30S WEST OF THE MISSISSIPPI RIVER. ALL OF THIS IS HEADING TOWARD
SOUTHWEST LOWER MICHIGAN. ALSO GIVEN THE 35 TO 50 KNOT WINDS
OVERNIGHT IN THE 1000 TO 3000 FT AGL LAYER... IT WOULD SEEM TO ME
TEMPERATURES MUST RISE OVERNIGHT... SO THAT IS WHAT I HAVE IN THE
GRIDS. THE RAP AND HRRR OUTGOING LONGWAVE RADIATION FORECAST
SUGGESTS WHAT THE NAM INDICATES THAT THE LOW CLOUDS WILL LIKELY
STAY NEAR AND NORTH OF ROUTE 10 OVERNIGHT.
FRIDAY WILL SEE ANOTHER ONE OF THOSE SURGE WARM UPS... EVEN WITH
THE SNOW COVER THE BOUNDARY LAYER IS SO WARM (925 MB TEMP REACHED
45F BY 12Z OVER GRR) I HAVE TO BELIEVE HIGHS WILL BE BETWEEN 45
AND 50 BUT I WENT CONSERVATIVE WITH HIGHS IN THE MID 40S.
THERE IS A SHORTWAVE WITH THE COLD FRONT AND MOISTURE WHILE STILL
SHALLOW IS DEEP ENOUGH FOR THE DGZ TO ACTIVATE A LITTLE LIGHT
PRECIPITATION FRIDAY EVENING INTO EARLY SATURDAY. NOTHING MUCH
THROUGH... MOSTLY LESS THAN .05 QPF.
THE LOW LEVEL MOISTURE HANGS IN THERE INTO SATURDAY EVENING AS A
SYSTEM GOES BY TO OUR SOUTH SO THERE IS A CHANCE OF FLURRIES
SATURDAY BUT TEMPERATURES WILL MOSTLY BE IN THE LOWER TO MID 30S
DURING THE DAY. SOME CLEARING AND MUCH COLDER BY SUNDAY MORNING AS
AN ARCTIC HIGH MOVES IN FROM.
.LONG TERM...(SUNDAY THROUGH THURSDAY)
ISSUED AT 323 PM EDT THU MAR 13 2014
A SOUTHERN STREAM SYSTEM MOVING ACROSS THE DEEP SOUTH WILL HELP TO
DRAW DOWN COLDER AIR FROM CANADA SUNDAY AND MONDAY. AFTER THAT A
DEVELOPING PLAINS LOW WILL MOVE EAST. LATEST ECMWF AND GFS SHOW THE
LOW MOVING OVER SOUTHEAST WISCONSIN TUESDAY/TUESDAY NIGHT. THE ECMWF
IS THE FARTHEST NORTHWEST WITH THE TRACK. THIS TRACK WOULD RESULT IN
WARMER AIR MOVING OVER THE CWA. WE HAVE A MIX OF RAIN AND SNOW IN
THE GRIDS AND THAT SEEMS LIKE A GOOD POSSIBILITY THIS FAR OUT GIVEN
THICKNESS VALUES IN NEAR 548DAM. AS THE SYSTEM OCCLUDES
WEDNESDAY...COLDER AIR WILL BEGIN TO MOVE INTO THE WRN CWA...SO WE
CHANGED THE MIXED PCPN BACK TO SNOW WEDNESDAY AFTERNOON. COLDER AIR
THEN REMAINS ENTRENCHED OVER THE CWA THROUGH THE REST OF THE PERIOD.
CERTAINLY LOOKS LIKE TEMPS WILL REMAIN WELL BELOW NORMAL THROUGH THE
PERIOD.
&&
.AVIATION...(FOR THE 06Z TAFS THROUGH 06Z FRIDAY NIGHT)
ISSUED AT 1150 PM EDT THU MAR 13 2014
SATELLITE IMAGERY SHOWS THIN STRATUS WITH BASES 1500 TO 2500 FEET
AGL FROM MKG TO LAN LATE THURSDAY EVENING IS FINALLY STARTING TO
LIFT NORTH AND EAST. OTHER THAN THIS VFR CONDITIONS SHOULD PREVAIL
THROUGH FRIDAY. SOUTH WINDS TONIGHT AROUND 10 KNOTS WILL BECOME
SOUTHWEST AND INCREASE FRIDAY WITH GUSTS OVER 20 KNOTS INTO THE
AFTERNOON.
&&
.HYDROLOGY...
ISSUED AT 323 PM EDT THU MAR 13 2014
THE PERIODS OF WARMER TEMPERATURE WITH LIMITED RAIN MIXED WITH COLD
SNAPS OF LATE HAS RESULTED IN A DECREASE IN ICE DEPTH ON RIVERS AND
HAS DECREASED THE MOISTURE TRAPPED IN THE SNOW PACK. CURRENT SNOW
WATER EQUIVALENT VALUES ARE GENERALLY IN THE 2 TO 4 INCH RANGE. THIS
WEATHER PATTERN IS EXPECTED TO CONTINUE THROUGH THE NEXT WEEK...
WHICH SHOULD LOWER THE CHANCES FOR ICE JAM FORMATION AND FLOODING AS
WE PROGRESS INTO SPRING.
&&
.GRR WATCHES/WARNINGS/ADVISORIES...
MI...NONE.
LM...NONE.
&&
$$
SYNOPSIS...WDM
SHORT TERM...WDM
LONG TERM...93
AVIATION...OSTUNO
HYDROLOGY...63
AREA FORECAST DISCUSSION
NWS GRAND RAPIDS MI
751 PM EDT THU MAR 13 2014
LATEST UPDATE...
AVIATION
.SYNOPSIS...
ISSUED AT 323 PM EDT THU MAR 13 2014
A CLIPPER TYPE SURFACE LOW WILL TRACK NORTH OF LAKE SUPERIOR
TONIGHT THEN HEAD EAST TOWARD SOUTHERN QUEBEC FRIDAY NIGHT. THAT
WILL BRING A STRONG WARM FRONT THROUGH THE AREA EARLY FRIDAY
MORNING. TEMPERATURES MAY ACTUALLY RISE OVERNIGHT AS THE MUCH
WARMER AIR SURGES IN. THE COLD FRONT TRAILING THE SYSTEM WILL
CROSS SOUTHWEST LOWER MICHIGAN FRIDAY AFTERNOON BRINGING THE COLD
AIR BACK INTO THE REGION THROUGH THE WEEKEND. THERE COULD BE A
PERIOD OF MIXED LIGHT RAIN AND LIGHT SNOW FRIDAY AFTERNOON THAT
WOULD TURN TO FLURRIES FRIDAY NIGHT AS THE COLD AIR COMES IN.
&&
.SHORT TERM...(THIS EVENING THROUGH SATURDAY NIGHT)
ISSUED AT 323 PM EDT THU MAR 13 2014
THE MAIN ISSUE WITH THIS FORECAST IS JUST HOW WARM DOES IT GET
FRIDAY AS YET ANOTHER STRONG SURGE OF WARM AIR MOVES IN OVER OUR
DEEP SNOW COVER. THERE IS THE POTENTIAL FOR SOME SPRINKLES OR
FLURRIES NEAR AND NORTH OF ROUTE 10 THIS EVENING JUST AHEAD OF THE
WARM FRONT. ALSO A BETTER SHOT AT LIGHT PRECIPITATION FRIDAY
AFTERNOON INTO EARLY SATURDAY AS THE COLD AIR COMES BACK IN ONCE
AGAIN.
CURRENT RADAR LOOPS SHOW SNOW FALLING FROM A MID CLOUD DECK OVER
EASTERN LAKE MICHIGAN HOWEVER THE AIR BELOW THIS IS VERY DRY SO I
DO NOT BELIEVE THIS CAN REACH THE GROUND. I DID NOT PUT POP FOR
THIS SINCE EVEN IF IT DOES HAPPEN IT WOULD NOT BE MEASURABLE.
THE NEXT ISSUE IS TEMPERATURES... JUST WHAT WILL THEY DO?
CURRENTLY WE HAVE TEMPERATURES IN THE 50S IN IOWA AND EVEN IN
EASTERN WISCONSIN LOWER 30S ARE COMMON. DEW POINTS ARE IN THE MID
30S WEST OF THE MISSISSIPPI RIVER. ALL OF THIS IS HEADING TOWARD
SOUTHWEST LOWER MICHIGAN. ALSO GIVEN THE 35 TO 50 KNOT WINDS
OVERNIGHT IN THE 1000 TO 3000 FT AGL LAYER... IT WOULD SEEM TO ME
TEMPERATURES MUST RISE OVERNIGHT... SO THAT IS WHAT I HAVE IN THE
GRIDS. THE RAP AND HRRR OUTGOING LONGWAVE RADIATION FORECAST
SUGGESTS WHAT THE NAM INDICATES THAT THE LOW CLOUDS WILL LIKELY
STAY NEAR AND NORTH OF ROUTE 10 OVERNIGHT.
FRIDAY WILL SEE ANOTHER ONE OF THOSE SURGE WARM UPS... EVEN WITH
THE SNOW COVER THE BOUNDARY LAYER IS SO WARM (925 MB TEMP REACHED
45F BY 12Z OVER GRR) I HAVE TO BELIEVE HIGHS WILL BE BETWEEN 45
AND 50 BUT I WENT CONSERVATIVE WITH HIGHS IN THE MID 40S.
THERE IS A SHORTWAVE WITH THE COLD FRONT AND MOISTURE WHILE STILL
SHALLOW IS DEEP ENOUGH FOR THE DGZ TO ACTIVATE A LITTLE LIGHT
PRECIPITATION FRIDAY EVENING INTO EARLY SATURDAY. NOTHING MUCH
THROUGH... MOSTLY LESS THAN .05 QPF.
THE LOW LEVEL MOISTURE HANGS IN THERE INTO SATURDAY EVENING AS A
SYSTEM GOES BY TO OUR SOUTH SO THERE IS A CHANCE OF FLURRIES
SATURDAY BUT TEMPERATURES WILL MOSTLY BE IN THE LOWER TO MID 30S
DURING THE DAY. SOME CLEARING AND MUCH COLDER BY SUNDAY MORNING AS
AN ARCTIC HIGH MOVES IN FROM.
.LONG TERM...(SUNDAY THROUGH THURSDAY)
ISSUED AT 323 PM EDT THU MAR 13 2014
A SOUTHERN STREAM SYSTEM MOVING ACROSS THE DEEP SOUTH WILL HELP TO
DRAW DOWN COLDER AIR FROM CANADA SUNDAY AND MONDAY. AFTER THAT A
DEVELOPING PLAINS LOW WILL MOVE EAST. LATEST ECMWF AND GFS SHOW THE
LOW MOVING OVER SOUTHEAST WISCONSIN TUESDAY/TUESDAY NIGHT. THE ECMWF
IS THE FARTHEST NORTHWEST WITH THE TRACK. THIS TRACK WOULD RESULT IN
WARMER AIR MOVING OVER THE CWA. WE HAVE A MIX OF RAIN AND SNOW IN
THE GRIDS AND THAT SEEMS LIKE A GOOD POSSIBILITY THIS FAR OUT GIVEN
THICKNESS VALUES IN NEAR 548DAM. AS THE SYSTEM OCCLUDES
WEDNESDAY...COLDER AIR WILL BEGIN TO MOVE INTO THE WRN CWA...SO WE
CHANGED THE MIXED PCPN BACK TO SNOW WEDNESDAY AFTERNOON. COLDER AIR
THEN REMAINS ENTRENCHED OVER THE CWA THROUGH THE REST OF THE PERIOD.
CERTAINLY LOOKS LIKE TEMPS WILL REMAIN WELL BELOW NORMAL THROUGH THE
PERIOD.
&&
.AVIATION...(FOR THE 00Z TAFS THROUGH 00Z FRIDAY EVENING)
ISSUED AT 750 PM EDT THU MAR 13 2014
SOME PATCHY LOW CLOUDS ARE POSSIBLE OVERNIGHT BUT EXPECT VFR
CONDITIONS TO PREVAIL. SOUTHWEST WINDS GUSTING NEAR 20 KNOTS WILL
LIMIT ANY FOG OVERNIGHT DESPITE INCREASING LOW LEVEL MOISTURE.
&&
.HYDROLOGY...
ISSUED AT 323 PM EDT THU MAR 13 2014
THE PERIODS OF WARMER TEMPERATURE WITH LIMITED RAIN MIXED WITH COLD
SNAPS OF LATE HAS RESULTED IN A DECREASE IN ICE DEPTH ON RIVERS AND
HAS DECREASED THE MOISTURE TRAPPED IN THE SNOW PACK. CURRENT SNOW
WATER EQUIVALENT VALUES ARE GENERALLY IN THE 2 TO 4 INCH RANGE. THIS
WEATHER PATTERN IS EXPECTED TO CONTINUE THROUGH THE NEXT WEEK...
WHICH SHOULD LOWER THE CHANCES FOR ICE JAM FORMATION AND FLOODING AS
WE PROGRESS INTO SPRING.
&&
.GRR WATCHES/WARNINGS/ADVISORIES...
MI...NONE.
LM...NONE.
&&
$$
SYNOPSIS...WDM
SHORT TERM...WDM
LONG TERM...93
AVIATION...OSTUNO
HYDROLOGY...63
AREA FORECAST DISCUSSION
NWS MARQUETTE MI
129 PM EDT WED MAR 12 2014
.SHORT TERM...(TODAY AND TONIGHT)
ISSUED AT 403 AM EDT WED MAR 12 2014
THE COLD FRONT THAT SHIFTED SOUTH ACROSS UPPER MICHIGAN LATE
YESTERDAY AFTERNOON AND EVENING PRODUCED SNOW SHOWERS OVER MUCH OF
WESTERN AND CENTRAL UPPER MICHIGAN...WITH THE STRONGEST SHOWERS SEEN
OVER NORTH CENTRAL UPPER MICHIGAN. THIS WAS DUE TO THE NORTH TO
NORTHEAST WINDS PROVIDING TERRAIN ENHANCEMENT TO THE LIGHTER SNOW
SHOWERS AND ENDED UP PRODUCING ABOUT AN INCH OF SNOW AT OUR OFFICE
THROUGH 2AM. THE INTENSITY HAS REALLY DIMINISHED OVER THE LAST HOUR
OR TWO DUE TO THE DRY AIR (ASSOCIATED WITH THE HIGH OVER NORTHWEST
ONTARIO) THAT HAS BEEN SURGING SOUTH ACROSS LAKE SUPERIOR ON IR
SATELLITE. WITH LIMITED BREAKS IN THE ICE...THE COLD AIR (RAP
ANALYZED 900MB TEMPERATURES OF -17C) HAS ONLY BEEN ABLE TO PRODUCE
A COUPLE LAKE EFFECT CLOUD STREAMERS OFF THE OPEN AREA NEAR ISLE
ROYALE AND THAT IS STRETCHING TOWARDS AREAS SOUTHWEST OF THE
PORCUPINE MOUNTAINS. THIS DRYING ABOVE 900MB HAS LED TO SIGNIFICANT
ADJUSTMENTS TO THE GOING FORECAST.
SINCE THE HIGH WILL CONTINUE TO SLIDE SOUTHEAST OVER THE AREA
THROUGH THE DAY TODAY...HAVE TRENDED THE FORECAST TOWARDS A FASTER
END TO THE SNOW. WOULD EXPECT THE CLOUDS AND LIGHT SNOW SHOWERS OR
FLURRIES TO REMAIN THE LONGEST OVER THE NORTH CENTRAL U.P. WHERE THE
NORTHEAST WINDS WILL REMAIN MOST FAVORABLE. LOOKING AT 00Z NAM/GFS
SOUNDINGS THEY DO HOLD ONTO MOISTURE RIGHT BELOW THAT INVERSION INTO
THE AFTERNOON FOR KSAW...BUT THE LAST SEVERAL RAP RUNS REALLY SCOUR
THAT MOISTURE OUT. THUS...WILL KEEP THE TREND TOWARDS PARTLY CLOUDY
SKIES BY AFTERNOON OVER THE NORTH CENTRAL AND PARTLY CLOUDY TO
MOSTLY SUNNY ELSEWHERE AWAY FROM THE UPSLOPE FLOW. AS FOR THE SNOW
SHOWERS...HAVE CUT THAT BACK SIGNIFICANTLY...WITH THEM MAINLY BEING
CONFINED TO THE NORTH CENTRAL FOR THE NEXT FEW HOURS AND THEN
QUICKLY DIMINISHING DURING THE MORNING WITH THE WINDS STARTING TO
BACK MORE TO THE NORTH-NORTHWEST. WILL MONITOR CLOUD/SNOW TRENDS
THROUGH DAY BREAK AND MAY NEED TO DIMINISH THEM EVEN EARLIER THAN
THE GOING FORECAST.
WITH THE COLD AIR ALOFT THAT IS MOVING OVER THE AREA...EXPECT THE
EARLY MORNING TEMPERATURES TO CONTINUE TO SLOWLY FALL. THE 3AM OBS
(RANGING FROM 9 DEGREES IN COPPER HARBOR AND 27 IN MENOMINEE) WILL
LIKELY BE THE WARMEST VALUES FOR THE RESPECTIVE LOCATIONS AND ONLY
HAVE HIGHS IN THE UPPER SINGLE DIGITS TO THE NORTH AND THE MID
TEENS TO THE SOUTH. AM A LITTLE CONCERNED THE WARM MARCH SUN THIS
AFTERNOON COULD PRODUCE HIGHS A LITTLE WARMER THAN EXPECTED AND DID
ADJUST INLAND WEST AREAS UP A COUPLE DEGREES TO ACCOUNT FOR THIS.
FOR SEVERAL COOP SITES OVER THE WEST THAT REPORT ON A 7AM-7AM
CYCLE...DAYTIME HIGHS TODAY COULD BE NEAR OR BREAK RECORD LOW HIGHS
FOR THE OBS THAT WILL BE REPORTED ON MARCH 13TH.
WITH THE HIGH BEING OVER DIRECTLY OVER THE U.P. THIS EVENING AND
CLEAR SKIES...EXPECT TEMPERATURES TO QUICKLY DROP OVER THE WEST AND
CENTRAL INITIALLY WITH THE LIGHT WINDS. THOSE AREAS SHOULD SEE
THEIR LOWS EARLIER THAN THE EAST DUE TO THE HIGH SHIFTING SOUTHEAST
OF THE AREA LATE TONIGHT AND ALLOWING SOUTHERLY FLOW TO DEVELOP. IN
ADDITION...MID CLOUDS WILL BE ARRIVING OVER THE WEST LATE IN
RESPONSE TO INCREASING WARM AIR ADVECTION ALOFT AND COULD EVEN LEAD
TO SOME LIGHT SNOW SHOWERS OVER THE WESTERN QUARTER OF LAKE
SUPERIOR BEFORE 12Z. OVER THE EAST...THE LATER WEAKENING OF THE
WINDS SHOULDN/T HAVE MUCH AFFECT ON THE LOWS AND EXPECT THE LONGER
RADIATIONAL COOLING TIME TO ALLOW LOWS TO EASILY FALL INTO THE
TEENS BELOW ZERO. WILL CONTINUE TO FOLLOW THE NH/REGIONAL CANADIAN
MODEL FOR TEMPERATURES OVER THE EAST...DUE TO IT/S GREAT
PERFORMANCE THIS WINTER ON THESE TYPES OF NIGHTS. DID TREND LOWS
DOWN A LITTLE FOR SOME OF THE TRADITIONAL COLD SPOTS (RAWS SITES
LIKE DOE LAKE AND SPINCICH LAKE)...WHICH WILL LIKELY SEE VALUES
FALLING INTO THE LOWER -20S. CURRENT FORECAST HAS LOWS
NEARING/BREAKING RECORDS FOR MANISTIQUE (-7 IN 1948) AND MUNISING
(-10 IN 1926).
.LONG TERM...(THURSDAY THROUGH TUESDAY)
ISSUED AT 513 AM EDT WED MAR 12 2014
THE OVERALL PATTERN WILL CONTINUE TO BE INFLUENCED BY RIDGING OVER
WRN NOAM AND THE RESULTING DOWNSTREAM TROUGH INTO THE GREAT LAKES
AND NERN CONUS...KEEPING TEMPS MAINLY BELOW NORMAL. A CLIPPER
SHORTWAVE AND LOW MOVING THROUGH THE REGION WILL BRING A WARMUP
FRIDAY WITH A CHANCE OF SOME LIGHT PCPN BUT WILL DRAG MUCH COLDER
AIR INTO THE REGION IN ITS WAKE FOR THE WEEKEND.
THU...AS ARCTIC HIGH PRES SHIFTS TO THE EAST AND MID LEVEL RIDGING
BUILDS TOWARD THE UPPER MS VALLEY...WAA WILL SPREAD CLOUDS
THROUGH UPPER MICHIGAN. ONLY SLIGHT CHANCE POPS FOR LIGHT SNOW WERE
INCLUDED GIVEN ONLY LIMITED MOISTURE AVAILABILITY AND RELATIVELY
SMALL NET ISENTROPIC LIFT AS THE 850-700 MB LAYER WARMS. A LARGE
SPREAD OF HIGH TEMPS IS EXPECTED WITH READINGS RANGING FROM AROUND 20
NEAR ERY TO 40 AT IWD.
THU NIGHT INTO FRI...THE GEM AND ECMWF HAVE REMAINED FARTHER SOUTH
WITH THE TRACK OF THE CLIPPER SHRTWV COMPARED TO THE NAM AND GFS.
EVEN THOUGH THERE IS LINGERING MODEL UNCERTAINTY...THERE SHOULD BE
ENOUGH 700-300 MB QVECTOR CONV WITH THIS FEATURE TO SUPPORT AT LEAST
LOW END PCPN CHANCES OVER MOST OF THE CWA FRI...ESPECIALLY OVER THE
NORTH HALF. ALTHOUGH THERE MAY BE ENOUGH WARM AIR IN THE WARM SECTOR
TO SUPPORT SOME LIGHT RAIN...WET-BULB ZERO HEIGHTS FAVOR MAINLY
SNOW. HIGHS SHOULD STILL CLIMB ABOVE NORMAL INTO THE MID AND UPPER
30S.
FRI NIGHT AND SAT...THE LOW PRESSURE SYSTEM WILL DRAG A COLD FRONT
THROUGH UPPER MI WITH 850 MB TEMPS FALLING TO NEAR -14C BY 12Z/SAT
AND -20C BY 00Z/SUN. THE MOST FAVORABLE PERIOD FOR SNOW SHOWERS...
AIDED BY HEAT/MOISTURE FLUX ACROSS SOME GAPS IN THE ICE COVER AND
UPSLOPE FLOW INTO THE HIGHER TERRAIN...WILL BE BETWEEN 06Z-18Z WHEN
THE GREATER 850-700 MB MOISTURE AND IS PRESENT. ANY SNOW SHOWERS
STILL BE LIGHT...GENERALLY ONLY AN INCH OR TWO AT MOST. TEMPS WILL
STRUGGLE TO AROUND 20 NORTH BUT MAY CLIMB TO THE UPPER 20S SOUTH.
SUN-TUE...AS THE ARCTIC HIGH SETTLES INTO THE REGION SUN...HIGHS
WILL REMAIN IN THE TEENS UNDER MOSTLY SUNNY SKIES AFTER MORNING LOWS
AT OR JUST BELOW ZERO. MODEL DIFFERENCES ARE MUCH GREATER BY MON-TUE
AS THE ECMWF KEEPS MORE TROUGHING AND COLD AIR OVER THE GREAT LAKES
COMPARED TO THE GFS/GEM WHICH KEEPS MOST OF THE PCPN WITH A SHRTWV
AND LOW TO THE SOUTH AND WEST OF UPPER MICHIGAN.
&&
.AVIATION...(FOR THE 18Z TAFS THROUGH 18Z THURSDAY AFTERNOON)
ISSUED AT 127 PM EDT WED MAR 12 2014
GUSTY NORTH WINDS AT KSAW WILL GIVE WAY TO LIGHT WINDS BY THIS
EVENING. MID CLOUDS INCREASE LATE TONIGHT AT ALL THE TAF SITES
AND THESE WILL GRADUALLY LOWER ON THURSDAY. LGT SNOW OR FLURRIES MAY
OCCUR ON THURSDAY AT ANY OF THE TAF SITES...BUT DID NOT MENTION ATTM.
NO REAL REDUCTION TO VSBY IS EXPECTED FROM ANY SNOW THAT WOULD OCCUR.
&&
.MARINE...(FOR THE 4 AM LAKE SUPERIOR FORECAST ISSUANCE)
ISSUED AT 403 AM EDT WED MAR 12 2014
COLD AIR SURGING SOUTH ACROSS LAKE SUPERIOR THIS PAST EVENING LED
TO A PERIOD OF NORTHERLY GUSTS TO 25-30KTS OVER MUCH OF THE LAKE.
THESE WINDS ARE EXPECTED TO QUICKLY DIMINISH TODAY AS AN AREA OF
HIGH PRESSURE IN NORTHWEST ONTARIO QUICKLY SHIFTS SOUTHEAST OVER
THE UPPER GREAT LAKES REGION. THIS HIGH WILL EXIT THE AREA LATE
TONIGHT AND THURSDAY MORNING ALLOWING SOUTHWESTERLY WINDS TO START
TO INCREASE AHEAD OF THE NEXT CLIPPER SYSTEM THAT WILL MOVE ACROSS
LAKE SUPERIOR THURSDAY NIGHT AND FRIDAY MORNING. SOUTHWEST WINDS
MAY INCREASE TO 15-25KTS AHEAD OF THIS LOW...THEN SHIFT TO THE
NORTHWEST AT SIMILAR VALUES ON THE BACK SIDE OF THE LOW. HIGH
PRESSURE WILL THEN BUILD SOUTH FROM CANADA SATURDAY AFTERNOON INTO
SUNDAY AND PRODUCE WEAKENING WINDS.
&&
.MQT WATCHES/WARNINGS/ADVISORIES...
UPPER MICHIGAN...
NONE.
LAKE SUPERIOR...
NONE.
LAKE MICHIGAN...
NONE.
&&
$$
SHORT TERM...SRF
LONG TERM...JLB
AVIATION...JLA
MARINE...SRF
AREA FORECAST DISCUSSION
NWS DETROIT/PONTIAC MI
119 PM EDT WED MAR 12 2014
.AVIATION...
//DISCUSSION...
STRONG NORTHERLY GRADIENT WINDS TRAILING THE SURFACE CYCLONE WILL BE
THE OVERWHELMING INFLUENCE ON THE WEATHER DURING THE NEXT 6 HOURS.
LIFR VSBY RESTRICTIONS OF 1/4 TO 1/2SM DUE TO BLOWING SNOW WILL
TRANSITION TO IFR (1SM) AT THE START OF THE PERIOD WITH THE HEAVY
SNOW BAND PUSHING EAST. THE NORTHERLY WINDS OF 30 TO 40 MPH ARE
EXPECTED TO PERSIST FOR THE AFTERNOON AND EVENING HOURS BEFORE
EASING WITH THE LOSS OF THE DAYTIME BOUNDARY LAYER. SUSTAINED
NORTHWESTERLY WINDS OF 10 MPH WILL HOLD THROUGH THE FIRST HALF OF
TONIGHT.
//DTW THRESHOLD THREATS...
* HIGH CONFIDENCE ON CEILING BELOW 5000 FEET TODAY.
* HIGH CONFIDENCE IN SNOW AS PRECIPITATION TYPE.
&&
.PREV DISCUSSION...ISSUED 1206 PM EDT WED MAR 12 2014
UPDATE...
CURRENT SURFACE ANALYSIS DEPICTS A SURFACE CYCLONE OF 988 MB OVER
WESTERN PA WHICH IS SLIGHTLY AHEAD OF PACE. IN RESPONSE...SURFACE
WINDS OVER SOUTHEASTERN MICHIGAN HAVE VEERED TO THE NORTHEAST
OPENING THE DOORS TO LOW LEVEL COLD AIR ADVECTION. AS OF 11
AM...THE COLD AIR HAS MADE INROADS TO ALONG AND NORTH OF THE
GLACIAL RIDGE. THE INTRODUCTION OF THE RESULTANT STEEPER MIDLEVEL
LAPSE RATES HAS HAD THE EXPECTED IMPACT ON SURFACE WINDS...WITH
MAGNITUDES NOW OF 20 TO 35 MPH ACROSS THE BOARD. THE WINDS IN
COMBINATION WITH THE SMALLER SNOWFLAKES IS CAUSING A SIGNIFICANT
CONTRIBUTION TO THE REDUCED VISIBILITIES.
MAIN DEFORMATION BAND IS NOW IN THE PIVOTING PHASE WITH REGARDS TO
SOUTHEASTERN MICHIGAN. THE HEAVIEST SNOWBAND IS NOW IN POSITION
ACROSS THE FAR SOUTHEASTERN COUNTIES...WHERE LARGER SNOWFLAKES ARE
FALLING PER OBSERVED VIDEO. WIND OBSERVATIONS OUT YIP AND HIGH Z
FROM KDTX SUPPORTS THAT NEAR BLIZZARD CONDITIONS ARE OCCURRING.
THESE CONDITIONS ARE EXPECTED TO BE OF A SHORT DURATION OVER THE
NEXT HOUR (NOT EXPECTING LESS THAN A QUARTER MILE). WILL LIKELY
SEE A GOOD SNOW ACCUMULATING BURST HERE FOR FAR SOUTHEASTERN
SECTIONS WHERE AN ADDITIONAL 2 TO 3 INCHES WILL BE POSSIBLE. FOR
THE REMAINDER OF THE CWA...SNOW IS EXPECTED TO STRIP OUT RAPIDLY
WITH PERHAPS AN ADDITIONAL 1 TO 2 INCHES SOUTH OF I 69. THIS WILL
PLACE THE EVENT TOTALS IN THE 6 TO 10 INCH RANGE...(HIGHEST ALONG
THE GLACIAL RIDGE SPINE AND LOWEST FROM WASHTENAW-WAYNE-EXTREME
SOUTHEASTERN OAKLAND COUNTY. ONCE THE PRECIPITATION ENDS...THE
NARRATIVE WILL SWITCH TO REDUCED VISIBILITIES DUE TO BLOWING SNOW
THAT WILL LINGER THROUGH THE EVENING COMMUTE.
PREV DISCUSSION...ISSUED 353 AM EDT WED MAR 12 2014
SHORT TERM... TODAY AND TONIGHT
A HIGH IMPACT WINTER STORM SYSTEM REMAINS ON TRACK FOR THE SOUTH
HALF OF SE MICHIGAN WITH THE PEAK OF THE EVENT DURING THE MORNING
COMMUTE ALONG AND SOUTH OF THE I-69 CORRIDOR. THE SYSTEM WILL BRING
HEAVY SNOW AND STRONG WIND OVER THE REGION DURING THE MORNING BEFORE
DIMINISHING DURING EARLY AFTERNOON. HEADLINE ADJUSTMENTS CONSIST OF
A WARNING UPGRADE TO LIVINGSTON, SHIAWASSEE, GENESEE, AND LAPEER.
THE CHARACTER OF THIS EVENT CONTINUES TO EXHIBIT A SHARP SNOWFALL
GRADIENT ON THE NORTH FLANK TO THE DEGREE THAT THE NORTHERN REACHES
OF MIDLAND AND BAY COUNTIES WILL SEE JUST A DUSTING OF ACCUMULATION
WHILE LOCATIONS ALONG THE I-69 CORRIDOR COULD SEE 6 INCHES IN 9
HOURS, AND LOCATIONS CLOSE TO THE OHIO BORDER COULD APPROACH 10
INCHES IF MESOSCALE ELEMENTS LINE UP JUST RIGHT. IN ADDITION, STRONG
NORTHERLY WIND GUSTS COULD PRODUCE NEAR BLIZZARD CONDITIONS AT
TIMES. AIDING IN THE DETERMINATION OF HEADLINE ADJUSTMENTS IS THE
00Z MODEL SUITE COMING IN WITH SOLID AGREEMENT ON THE TRACK OF THE
SURFACE LOW DIRECTLY ALONG THE OHIO RIVER TO THE SOUTHWEST
PENNSYLVANIA/WEST VIRGINIA BORDER BY NOON. THAT HELPS ADD CONFIDENCE
TO THE LOCATION, INTENSITY, AND DURATION OF MESOSCALE FORCING
FEATURES TARGETED FOR THE SLIGHT NORTHWARD EXPANSION OF THE WARNING
AREA. IT ALSO REINFORCES THE IDEA OF HIGHLIGHTING THE WIND FOR HURON
AND SANILAC COUNTIES GIVEN THE SHARP GRADIENT OF MEANINGFUL SNOW
ACCUMULATION THERE.
SURFACE OBSERVATIONS AND RADAR DEPICTION AROUND THE MIDNIGHT HOUR
REVEALED THE TENDENCY FOR A RAPID CHANGE TO ALL SNOW IN REGIONS OF
HIGHER PRECIPITATION RATE WITHIN THE LEADING ARM OF MID LEVEL
FRONTAL FORCING. AFTER A BRIEF LULL, AND WITH ADDITIONAL LOW LEVEL
COLD ADVECTION, IT IS NO SURPRISE THAT THIS REGION OF THE SYSTEM HAS
LIT UP AGAIN WITH ALL SNOW AS THE PRIMARY MOISTURE SURGE ARRIVES. A
CLOSED CIRCULATION AND TRUE TROWAL STRUCTURE WILL BE ABSENT FROM THE
SYSTEM BUT A DEEP AND DYNAMIC DEFORMATION ZONE ON THE NW FLANK OF
THE LOW WILL ENSURE A STRONG MESOSCALE RESPONSE TO FORCING AS THE
SYSTEM MOVES THROUGH SE MICHIGAN. THE FIRST SIGNS OF THIS PROCESS IS
THE RAPID CLOUD TOP COOLING IN IR SATELLITE IMAGERY BETWEEN MIDNIGHT
AND 3 AM WITH RADAR COMPOSITE INDICATING A WIDE BAND OF HEAVY
PRECIPITATION FROM NORTHERN MISSOURI INTO OUR AREA ALONG THE I-69
CORRIDOR. CONVECTIVE ELEMENTS TO THE SOUTH ARE MORE INDICATIVE OF
CONVECTIVE INSTABILITY IN THE FRONTAL ZONE BELOW 850 MB, AND THIS IS
WHERE LIGHTNING STRIKES SHOULD REMAIN, BUT SOME THUNDER SNOW WITHIN
THE DEFORMATION AXIS IS NOT OUT OF THE QUESTION AS FAR NORTH AS
METRO DETROIT. MODEL CROSS SECTIONS INDICATE IMPRESSIVE CONVECTIVE
INSTABILITY IN THE 700-500 MB LAYER MATCHING UP WELL WITH THE
OBSERVED BAND FILLING IN OVER THE SOUTH HALF OF SE MICHIGAN. THIS,
ALONG WITH SPECIFIC HUMIDITY OF 3-4 G/KG WILL MAKE MAXIMUM USE OF A
DEEP WEDGE OF FRONTOGENESIS EXCEEDING 100 UNITS. SIMILAR DEPICTION
IN THE LATEST RAP OUTPUT INDICATES THE BURST OF HEAVY SNOWFALL RATES
FROM HIGHER ALTITUDE AND WITH HIGHER SNOW RATIO PERSISTING THROUGH
CENTRAL SECTIONS OF THE REGION WITH A PIVOT OCCURRING IN THE 12-15Z
TIME PERIOD BEFORE MIGRATING SOUTHWARD AND EASTWARD DURING THE LATE
MORNING. THIS IS THE SUSPECTED SOURCE OF OVERACHIEVEMENT IN
SNOWFALL TOTALS ON THE NORTHERN FRINGES OF THE WARNING AREA. FARTHER
SOUTH, THE GOING 6 TO 9 INCH FORECAST LOOKS SOLID AS THE MID LEVEL
FRONTAL ZONE AND DEFORMATION ZONE FILL IN TO FORM ONE SOLID NW FLANK
OF THE SYSTEM WITH 1-2 INCH PER HOUR PEAK RATES FOR LONGER DURATION
THAN POINTS NORTH.
THE SYSTEM WILL EXIT THE AREA BY MID AFTERNOON WITH TRAILING
NORTHERLY FLOW CARRYING IN ANOTHER ROUND OF ARCTIC AIR. DEPENDING ON
THE CLEARING TREND, BELOW ZERO MIN TEMPS ARE ON TARGET WITH FRESH
SNOW COVER BY SUNRISE THURSDAY.
LONG TERM...THURSDAY THROUGH TUESDAY
A QUICK LOOK AT THE LONGWAVE PATTERN THROUGH THE NEXT WEEK SHOW
SPLIT FLOW OVER THE WEST COAST WITH THE TROUGH STILL HOLDING ON OVER
THE EASTERN CONUS. THE JET STREAM IS VERY ACTIVE/ENERGETIC...BOTH
NORTHERN AND SOUTHERN STREAMS...BUT AT THIS POINT IT LOOKS LIKE THE
MAJORITY OF THE PRECIP WILL TRY TO STEER CLEAR OF SOUTHERN MI. THE
GOOD NEWS IS THAT WE ARE STILL GETTING SURGES OF SOUTHERLY FLOW
EVERY THIRD DAY OR SO...BUT THE BAD NEWS IS THAT THESE WARM UPS INTO
THE LOW 40S ARE STRUGGLING TO REACH MID MARCH AVERAGE HIGH TEMPS
WHICH ARE IN THE MID 40S. TO SUM IT UP...THE MARCH
ROLLER COASTER/WAVE TRAIN WILL CONTINUE FOR THE FORESEEABLE FUTURE.
WILL NOW HIT ON A FEW FEATURES OF NOTE IN THE EXTENDED PERIOD.
THURSDAY WILL BE A COLD DAY AS THE MID/UPPER LEVEL ARCTIC TROUGH
REMAINS IN CONTROL WITH NORTHERN EXTENSION OF A HIGH PRESSURE SYSTEM
AT THE SURFACE THAT SLIDE SOUTH BEHIND WEDNESDAYS BIG SYSTEM.
NORTHERLY WINDS WILL BACK TO WESTERLY AS HEIGHTS BUILD THROUGH THE
DAY BUT WE STILL ONLY GET TO 542DAM AT 500MB BY THURSDAY EVENING SO
WE WILL NOT REALIZE THAT INCREASE AT THE SFC DURING DAYLIGHT HOURS.
FRIDAY WE FIND OURSELVES IN BETWEEN THE EXITING HIGH AND A CLIPPER
TRACKING EASTWARD OVER NORTHERN LAKE SUPERIOR. SW TO NE PRESSURE
GRADIENT WILL SET UP GOOD SW FLOW AND WAA. LL JET AT 850MB WILL PEAK
AROUND 45 KNOTS DURING THE AFTERNOON ALTHOUGH WE ONLY LOOK TO MIX UP
TO AROUND 900MB. SHOULD STILL BE FAIRLY BREEZY OUT IN THE AFTERNOON
WITH GUSTS REACHING 20-30 MPH. HIGHS SHOULD REACH INTO THE 40S ONCE
AGAIN. THERE IS A SLIGHT CHANCE THAT A FEW RAIN/SNOW SHOWERS COULD
POP UP LATE FRIDAY OR OVERNIGHT BUT THERE IS NOT MUCH MOISTURE IN
THE COLUMN TO WORK WITH SO WILL CONTINUE TO LEAN TOWARD A DRY
FORECAST. THIS CLIPPER WILL PULL A PAIR OF COLD FRONTS THROUGH THE
REGION WHICH WILL CAUSE TEMPS TO DROP BOTH SATURDAY AND SUNDAY AS
COLDER AND COLDER AIR WORKS INTO THE AREA. SAME HOLDS TRUE FOR
SAT/SUN THAT MODELS ARE TRYING TO POP A FEW SHOWERS BUT DOMINATE
AREA OF HIGH PRESSURE BUILDING IN FROM CANADA WILL CONTINUE TO KEEP
VERY DRY AIR IN PLACE MAKING IT HARD FOR ANYTHING TO DEVELOP. EARLY
NEXT WEEK IT LOOKS LIKE THE NORTHERN AND SOUTHERN STREAMS OF THE
JETS WILL PHASE AGAIN PRODUCING ANOTHER STRONG LOW PRESSURE SYSTEM.
ALL INDICATIONS AT THIS POINT ARE THAT THE STORM WILL DEVELOP MUCH
FURTHER SOUTH AND EAST OF MI.
MARINE...
A STRONG LOW PRESSURE SYSTEM WILL DEEPEN AS IT TRACKS ALONG THE OHIO
RIVER THROUGH THIS AFTERNOON. THE TRACK OF THE STORM PLACES THE
EASTERN GREAT LAKES IN THE TIGHT NORTHEAST TO SOUTHWEST PRESSURE
GRADIENT FIELD WHICH WILL RESULT IN GALE FORCE WINDS TODAY. GALE
WARNINGS ARE IN EFFECT FOR LAKE HURON...LAKE ERIE AND LAKE ST CLAIR
THROUGH THIS EVENING. SEE CURRENT MARINE HEADLINES FOR THE LATEST
INFORMATION. A HIGH PRESSURE SYSTEM WILL THEN DROP THROUGH THE
GREAT LAKES FROM CANADA ALLOWING THE WINDS TO SUBSIDE. YET ANOTHER
LOW PRESSURE SYSTEM WILL MOVE ACROSS NORTHERN LAKE SUPERIOR ON
FRIDAY BRING A RETURN OF MODERATE SOUTHWEST FLOW AND MILDER AIR.
&&
.DTX WATCHES/WARNINGS/ADVISORIES...
MI...WINTER STORM WARNING...MIZ060-MIZ061-MIZ062-MIZ063-MIZ068-MIZ069-
MIZ070-MIZ075-MIZ076-MIZ082-MIZ083...UNTIL 3 PM WEDNESDAY.
WINTER WEATHER ADVISORY...MIZ053-MIZ054-MIZ055...UNTIL 3 PM
WEDNESDAY.
WIND ADVISORY...MIZ049-MIZ055...UNTIL 6 PM WEDNESDAY.
LAKE HURON...
GALE WARNING...LHZ363-LHZ421-LHZ422-LHZ441-LHZ442-LHZ443-LHZ462-
LHZ463-LHZ464...UNTIL 8 PM WEDNESDAY.
LAKE ST CLAIR...
GALE WARNING...UNTIL 8 PM WEDNESDAY.
MI WATERS OF LAKE ERIE...
GALE WARNING...UNTIL 8 PM WEDNESDAY.
&&
$$
AVIATION.....CB
UPDATE.......CB
SHORT TERM...BT
LONG TERM....DRK
MARINE.......DRK
YOU CAN OBTAIN YOUR LATEST NATIONAL WEATHER SERVICE FORECASTS ONLINE
AT WWW.WEATHER.GOV/DETROIT (ALL LOWER CASE).
AREA FORECAST DISCUSSION
NWS DETROIT/PONTIAC MI
1206 PM EDT WED MAR 12 2014
.UPDATE...
CURRENT SURFACE ANALYSIS DEPICTS A SURFACE CYCLONE OF 988 MB OVER
WESTERN PA WHICH IS SLIGHTLY AHEAD OF PACE. IN RESPONSE...SURFACE
WINDS OVER SOUTHEASTERN MICHIGAN HAVE VEERED TO THE NORTHEAST
OPENING THE DOORS TO LOW LEVEL COLD AIR ADVECTION. AS OF 11
AM...THE COLD AIR HAS MADE INROADS TO ALONG AND NORTH OF THE
GLACIAL RIDGE. THE INTRODUCTION OF THE RESULTANT STEEPER MIDLEVEL
LAPSE RATES HAS HAD THE EXPECTED IMPACT ON SURFACE WINDS...WITH
MAGNITUDES NOW OF 20 TO 35 MPH ACROSS THE BOARD. THE WINDS IN
COMBINATION WITH THE SMALLER SNOWFLAKES IS CAUSING A SIGNIFICANT
CONTRIBUTION TO THE REDUCED VISIBILITIES.
MAIN DEFORMATION BAND IS NOW IN THE PIVOTING PHASE WITH REGARDS TO
SOUTHEASTERN MICHIGAN. THE HEAVIEST SNOWBAND IS NOW IN POSITION
ACROSS THE FAR SOUTHEASTERN COUNTIES...WHERE LARGER SNOWFLAKES ARE
FALLING PER OBSERVED VIDEO. WIND OBSERVATIONS OUT YIP AND HIGH Z
FROM KDTX SUPPORTS THAT NEAR BLIZZARD CONDITIONS ARE OCCURRING.
THESE CONDITIONS ARE EXPECTED TO BE OF A SHORT DURATION OVER THE
NEXT HOUR (NOT EXPECTING LESS THAN A QUARTER MILE). WILL LIKELY
SEE A GOOD SNOW ACCUMULATING BURST HERE FOR FAR SOUTHEASTERN
SECTIONS WHERE AN ADDITIONAL 2 TO 3 INCHES WILL BE POSSIBLE. FOR
THE REMAINDER OF THE CWA...SNOW IS EXPECTED TO STRIP OUT RAPIDLY
WITH PERHAPS AN ADDITIONAL 1 TO 2 INCHES SOUTH OF I 69. THIS WILL
PLACE THE EVENT TOTALS IN THE 6 TO 10 INCH RANGE...(HIGHEST ALONG
THE GLACIAL RIDGE SPINE AND LOWEST FROM WASHTENAW-WAYNE-EXTREME
SOUTHEASTERN OAKLAND COUNTY. ONCE THE PRECIPITATION ENDS...THE
NARRATIVE WILL SWITCH TO REDUCED VISIBILITIES DUE TO BLOWING SNOW
THAT WILL LINGER THROUGH THE EVENING COMMUTE.
&&
.AVIATION...ISSUED 727 AM EDT WED MAR 12 2014
//DISCUSSION...
VLIFR/LIFR RESTRICTION IN MODERATE TO HEAVY SNOW WILL PERSIST FOR
THE BULK OF THE MORNING FROM FNT SOUTHWARD THROUGH THE DTW CORRIDOR.
ADD TO THAT A NORTH WIND GUSTING UP AROUND 30 KNOTS TO COMPLICATE
CONDITIONS FOR AVIATION OPERATIONS BOTH ON THE GROUND AND IN THE
AIR. MBS WILL WAVER BETWEEN IFR AND MVFR AND THESE CONDITIONS WILL
SPREAD SOUTHWARD OVER THE REST OF THE SITES AS AN IMPROVEMENT DURING
LATE MORNING AND EARLY AFTERNOON AS THE STRONG WINTER STORM SYSTEM
EXITS THE AREA. A NEW SURGE OF ARCTIC AIR WILL FOSTER A CLEARING
TREND DURING THE EVENING WITH CLEAR AND COLD CONDITIONS IN PLACE
AFTER MIDNIGHT THROUGH SUNRISE THURSDAY.
FOR DTW... NEAR ZERO VISIBILITY AND SNOWFALL RATES OF 1-2 INCHES PER
HOUR WILL PERSIST THROUGH MID MORNING RESULTING IN TOTAL
ACCUMULATION CLOSER TO THE 9 INCH END OF THE 6-9 INCH RANGE OF THE
FORECAST. IMPROVEMENT WILL THEN BE GRADUAL THROUGH IFR TO MVFR IN
BLOWING SNOW BY EARLY AFTERNOON. THIS WILL BE DUE TO NORTH WIND
GUSTING NEAR 35 KNOTS AT TIMES UNTIL CLOSE TO SUNSET.
//DTW THRESHOLD THREATS...
* MODERATE CONFIDENCE IN 1/4SM VISIBILITY AND 200FT CEILING.
* HIGH CONFIDENCE ON CEILING BELOW 5000 FEET TODAY.
* HIGH CONFIDENCE IN SNOW AS PRECIPITATION TYPE.
&&
.PREV DISCUSSION...ISSUED 353 AM EDT WED MAR 12 2014
SHORT TERM... TODAY AND TONIGHT
A HIGH IMPACT WINTER STORM SYSTEM REMAINS ON TRACK FOR THE SOUTH
HALF OF SE MICHIGAN WITH THE PEAK OF THE EVENT DURING THE MORNING
COMMUTE ALONG AND SOUTH OF THE I-69 CORRIDOR. THE SYSTEM WILL BRING
HEAVY SNOW AND STRONG WIND OVER THE REGION DURING THE MORNING BEFORE
DIMINISHING DURING EARLY AFTERNOON. HEADLINE ADJUSTMENTS CONSIST OF
A WARNING UPGRADE TO LIVINGSTON, SHIAWASSEE, GENESEE, AND LAPEER.
THE CHARACTER OF THIS EVENT CONTINUES TO EXHIBIT A SHARP SNOWFALL
GRADIENT ON THE NORTH FLANK TO THE DEGREE THAT THE NORTHERN REACHES
OF MIDLAND AND BAY COUNTIES WILL SEE JUST A DUSTING OF ACCUMULATION
WHILE LOCATIONS ALONG THE I-69 CORRIDOR COULD SEE 6 INCHES IN 9
HOURS, AND LOCATIONS CLOSE TO THE OHIO BORDER COULD APPROACH 10
INCHES IF MESOSCALE ELEMENTS LINE UP JUST RIGHT. IN ADDITION, STRONG
NORTHERLY WIND GUSTS COULD PRODUCE NEAR BLIZZARD CONDITIONS AT
TIMES. AIDING IN THE DETERMINATION OF HEADLINE ADJUSTMENTS IS THE
00Z MODEL SUITE COMING IN WITH SOLID AGREEMENT ON THE TRACK OF THE
SURFACE LOW DIRECTLY ALONG THE OHIO RIVER TO THE SOUTHWEST
PENNSYLVANIA/WEST VIRGINIA BORDER BY NOON. THAT HELPS ADD CONFIDENCE
TO THE LOCATION, INTENSITY, AND DURATION OF MESOSCALE FORCING
FEATURES TARGETED FOR THE SLIGHT NORTHWARD EXPANSION OF THE WARNING
AREA. IT ALSO REINFORCES THE IDEA OF HIGHLIGHTING THE WIND FOR HURON
AND SANILAC COUNTIES GIVEN THE SHARP GRADIENT OF MEANINGFUL SNOW
ACCUMULATION THERE.
SURFACE OBSERVATIONS AND RADAR DEPICTION AROUND THE MIDNIGHT HOUR
REVEALED THE TENDENCY FOR A RAPID CHANGE TO ALL SNOW IN REGIONS OF
HIGHER PRECIPITATION RATE WITHIN THE LEADING ARM OF MID LEVEL
FRONTAL FORCING. AFTER A BRIEF LULL, AND WITH ADDITIONAL LOW LEVEL
COLD ADVECTION, IT IS NO SURPRISE THAT THIS REGION OF THE SYSTEM HAS
LIT UP AGAIN WITH ALL SNOW AS THE PRIMARY MOISTURE SURGE ARRIVES. A
CLOSED CIRCULATION AND TRUE TROWAL STRUCTURE WILL BE ABSENT FROM THE
SYSTEM BUT A DEEP AND DYNAMIC DEFORMATION ZONE ON THE NW FLANK OF
THE LOW WILL ENSURE A STRONG MESOSCALE RESPONSE TO FORCING AS THE
SYSTEM MOVES THROUGH SE MICHIGAN. THE FIRST SIGNS OF THIS PROCESS IS
THE RAPID CLOUD TOP COOLING IN IR SATELLITE IMAGERY BETWEEN MIDNIGHT
AND 3 AM WITH RADAR COMPOSITE INDICATING A WIDE BAND OF HEAVY
PRECIPITATION FROM NORTHERN MISSOURI INTO OUR AREA ALONG THE I-69
CORRIDOR. CONVECTIVE ELEMENTS TO THE SOUTH ARE MORE INDICATIVE OF
CONVECTIVE INSTABILITY IN THE FRONTAL ZONE BELOW 850 MB, AND THIS IS
WHERE LIGHTNING STRIKES SHOULD REMAIN, BUT SOME THUNDER SNOW WITHIN
THE DEFORMATION AXIS IS NOT OUT OF THE QUESTION AS FAR NORTH AS
METRO DETROIT. MODEL CROSS SECTIONS INDICATE IMPRESSIVE CONVECTIVE
INSTABILITY IN THE 700-500 MB LAYER MATCHING UP WELL WITH THE
OBSERVED BAND FILLING IN OVER THE SOUTH HALF OF SE MICHIGAN. THIS,
ALONG WITH SPECIFIC HUMIDITY OF 3-4 G/KG WILL MAKE MAXIMUM USE OF A
DEEP WEDGE OF FRONTOGENESIS EXCEEDING 100 UNITS. SIMILAR DEPICTION
IN THE LATEST RAP OUTPUT INDICATES THE BURST OF HEAVY SNOWFALL RATES
FROM HIGHER ALTITUDE AND WITH HIGHER SNOW RATIO PERSISTING THROUGH
CENTRAL SECTIONS OF THE REGION WITH A PIVOT OCCURRING IN THE 12-15Z
TIME PERIOD BEFORE MIGRATING SOUTHWARD AND EASTWARD DURING THE LATE
MORNING. THIS IS THE SUSPECTED SOURCE OF OVERACHIEVEMENT IN
SNOWFALL TOTALS ON THE NORTHERN FRINGES OF THE WARNING AREA. FARTHER
SOUTH, THE GOING 6 TO 9 INCH FORECAST LOOKS SOLID AS THE MID LEVEL
FRONTAL ZONE AND DEFORMATION ZONE FILL IN TO FORM ONE SOLID NW FLANK
OF THE SYSTEM WITH 1-2 INCH PER HOUR PEAK RATES FOR LONGER DURATION
THAN POINTS NORTH.
THE SYSTEM WILL EXIT THE AREA BY MID AFTERNOON WITH TRAILING
NORTHERLY FLOW CARRYING IN ANOTHER ROUND OF ARCTIC AIR. DEPENDING ON
THE CLEARING TREND, BELOW ZERO MIN TEMPS ARE ON TARGET WITH FRESH
SNOW COVER BY SUNRISE THURSDAY.
LONG TERM...THURSDAY THROUGH TUESDAY
A QUICK LOOK AT THE LONGWAVE PATTERN THROUGH THE NEXT WEEK SHOW
SPLIT FLOW OVER THE WEST COAST WITH THE TROUGH STILL HOLDING ON OVER
THE EASTERN CONUS. THE JET STREAM IS VERY ACTIVE/ENERGETIC...BOTH
NORTHERN AND SOUTHERN STREAMS...BUT AT THIS POINT IT LOOKS LIKE THE
MAJORITY OF THE PRECIP WILL TRY TO STEER CLEAR OF SOUTHERN MI. THE
GOOD NEWS IS THAT WE ARE STILL GETTING SURGES OF SOUTHERLY FLOW
EVERY THIRD DAY OR SO...BUT THE BAD NEWS IS THAT THESE WARM UPS INTO
THE LOW 40S ARE STRUGGLING TO REACH MID MARCH AVERAGE HIGH TEMPS
WHICH ARE IN THE MID 40S. TO SUM IT UP...THE MARCH
ROLLER COASTER/WAVE TRAIN WILL CONTINUE FOR THE FORESEEABLE FUTURE.
WILL NOW HIT ON A FEW FEATURES OF NOTE IN THE EXTENDED PERIOD.
THURSDAY WILL BE A COLD DAY AS THE MID/UPPER LEVEL ARCTIC TROUGH
REMAINS IN CONTROL WITH NORTHERN EXTENSION OF A HIGH PRESSURE SYSTEM
AT THE SURFACE THAT SLIDE SOUTH BEHIND WEDNESDAYS BIG SYSTEM.
NORTHERLY WINDS WILL BACK TO WESTERLY AS HEIGHTS BUILD THROUGH THE
DAY BUT WE STILL ONLY GET TO 542DAM AT 500MB BY THURSDAY EVENING SO
WE WILL NOT REALIZE THAT INCREASE AT THE SFC DURING DAYLIGHT HOURS.
FRIDAY WE FIND OURSELVES IN BETWEEN THE EXITING HIGH AND A CLIPPER
TRACKING EASTWARD OVER NORTHERN LAKE SUPERIOR. SW TO NE PRESSURE
GRADIENT WILL SET UP GOOD SW FLOW AND WAA. LL JET AT 850MB WILL PEAK
AROUND 45 KNOTS DURING THE AFTERNOON ALTHOUGH WE ONLY LOOK TO MIX UP
TO AROUND 900MB. SHOULD STILL BE FAIRLY BREEZY OUT IN THE AFTERNOON
WITH GUSTS REACHING 20-30 MPH. HIGHS SHOULD REACH INTO THE 40S ONCE
AGAIN. THERE IS A SLIGHT CHANCE THAT A FEW RAIN/SNOW SHOWERS COULD
POP UP LATE FRIDAY OR OVERNIGHT BUT THERE IS NOT MUCH MOISTURE IN
THE COLUMN TO WORK WITH SO WILL CONTINUE TO LEAN TOWARD A DRY
FORECAST. THIS CLIPPER WILL PULL A PAIR OF COLD FRONTS THROUGH THE
REGION WHICH WILL CAUSE TEMPS TO DROP BOTH SATURDAY AND SUNDAY AS
COLDER AND COLDER AIR WORKS INTO THE AREA. SAME HOLDS TRUE FOR
SAT/SUN THAT MODELS ARE TRYING TO POP A FEW SHOWERS BUT DOMINATE
AREA OF HIGH PRESSURE BUILDING IN FROM CANADA WILL CONTINUE TO KEEP
VERY DRY AIR IN PLACE MAKING IT HARD FOR ANYTHING TO DEVELOP. EARLY
NEXT WEEK IT LOOKS LIKE THE NORTHERN AND SOUTHERN STREAMS OF THE
JETS WILL PHASE AGAIN PRODUCING ANOTHER STRONG LOW PRESSURE SYSTEM.
ALL INDICATIONS AT THIS POINT ARE THAT THE STORM WILL DEVELOP MUCH
FURTHER SOUTH AND EAST OF MI.
MARINE...
A STRONG LOW PRESSURE SYSTEM WILL DEEPEN AS IT TRACKS ALONG THE OHIO
RIVER THROUGH THIS AFTERNOON. THE TRACK OF THE STORM PLACES THE
EASTERN GREAT LAKES IN THE TIGHT NORTHEAST TO SOUTHWEST PRESSURE
GRADIENT FIELD WHICH WILL RESULT IN GALE FORCE WINDS TODAY. GALE
WARNINGS ARE IN EFFECT FOR LAKE HURON...LAKE ERIE AND LAKE ST CLAIR
THROUGH THIS EVENING. SEE CURRENT MARINE HEADLINES FOR THE LATEST
INFORMATION. A HIGH PRESSURE SYSTEM WILL THEN DROP THROUGH THE
GREAT LAKES FROM CANADA ALLOWING THE WINDS TO SUBSIDE. YET ANOTHER
LOW PRESSURE SYSTEM WILL MOVE ACROSS NORTHERN LAKE SUPERIOR ON
FRIDAY BRING A RETURN OF MODERATE SOUTHWEST FLOW AND MILDER AIR.
&&
.DTX WATCHES/WARNINGS/ADVISORIES...
MI...WINTER STORM WARNING...MIZ060-MIZ061-MIZ062-MIZ063-MIZ068-MIZ069-
MIZ070-MIZ075-MIZ076-MIZ082-MIZ083...UNTIL 3 PM WEDNESDAY.
WINTER WEATHER ADVISORY...MIZ053-MIZ054-MIZ055...UNTIL 3 PM
WEDNESDAY.
WIND ADVISORY...MIZ049-MIZ055...UNTIL 6 PM WEDNESDAY.
LAKE HURON...
GALE WARNING...LHZ363-LHZ421-LHZ422-LHZ441-LHZ442-LHZ443-LHZ462-
LHZ463-LHZ464...UNTIL 8 PM WEDNESDAY.
LAKE ST CLAIR...
GALE WARNING...UNTIL 8 PM WEDNESDAY.
MI WATERS OF LAKE ERIE...
GALE WARNING...UNTIL 8 PM WEDNESDAY.
&&
$$
UPDATE.......CB
AVIATION.....BT
SHORT TERM...BT
LONG TERM....DRK
MARINE.......DRK
YOU CAN OBTAIN YOUR LATEST NATIONAL WEATHER SERVICE FORECASTS ONLINE
AT WWW.WEATHER.GOV/DETROIT (ALL LOWER CASE).
AREA FORECAST DISCUSSION
NWS GRAND RAPIDS MI
1138 AM EDT WED MAR 12 2014
LATEST UPDATE...
UPDATE
.SYNOPSIS...
ISSUED AT 329 AM EDT WED MAR 12 2014
SNOW FALLING ACROSS THE SOUTHERN TWO THIRDS OF THE AREA THIS MORNING
WILL GRADUALLY END THIS MORNING AND INTO EARLY THIS AFTERNOON FROM
NW TO SE. HIGHEST SNOW ACCUMULATIONS WILL BE FOUND SOUTH OF I-69.
SOME BLOWING AND DRIFTING SNOW WILL BE POSSIBLE AS WIND INCREASE
THIS MORNING. SNOW AND CLOUDS WILL CLEAR OUT BY TONIGHT...ALLOWING
FOR A RECORD COLD NIGHT FOR THE AREA.
AFTER ANOTHER COLD DAY ON THURSDAY...TEMPERATURES WILL WARM BACK UP
FOR FRIDAY WITH A SMALL CHANCE OF RAIN UP NORTH IN THE AFTERNOON.
COLDER AIR AND A CHANCE FOR SNOW SHOWERS WILL MOVE BACK IN FOR
SATURDAY.
&&
.UPDATE...
ISSUED AT 1138 AM EDT WED MAR 12 2014
I AM PLANNING ON DROPPING THE HEADLINES FOR ALL BUT JACKSON AND
INGHAM COUNTIES BY NOON AS THE SNOW HAS ENDED OR NEARLY ENDED IN
ALL OTHER COUNTIES. LOOKING AT WEB CAMS AROUND THOSE COUNTIES THE
ROADS SEEM EITHER JUST WET AND I SEE NO SIGNIFICANT BLOWING SNOW
ISSUES EITHER. THE HEADLINES IN JACKSON AND INGHAM COUNTIES SHOULD
BE DONE BY 2 PM (ONE HOUR EARLY).
UPDATE ISSUED AT 942 AM EDT WED MAR 12 2014
GREATEST SNOWFALL REPORTS SO FAR HAVE RANGED FROM 6 TO 7.5 INCHES
ACROSS VAN BUREN...KALAMAZOO...CALHOUN...AND INGHAM COUNTIES. WE ARE
IN THE PROCESS OF SOLICITING REPORTS FROM JACKSON COUNTY.
MOST INTENSE SNOWFALL ASSOCIATED WITH A PRONOUNCED FGEN BAND IS
EXITING OUR SOUTHEASTERN FORECAST AREA. EXPECT SNOWFALL RATES TO
TAPER SIGNIFICANTLY OVER THE NEXT HOUR AS AN UPPER POTENTIAL
VORTICITY MAXIMUM SEEN ON WATER VAPOR/IR SATELLITE CHANNELS LIFTS
NORTHEAST OUT OF OUR SOUTHEAST FORECAST AREA. LATEST HRRR GUIDANCE
INDICATES THE TRAILING EDGE OF PRECIPITATION /CURRENTLY ALONG A
MOUNT PLEASANT TO HOLLAND LINE/ WILL EXIT THE FORECAST AREA BY 2
PM. AS SNOW RATES DECREASE WE EXPECT AN UPTICK IN SNOW RATIOS WHICH
MAKES BLOWING/DRIFTING SNOW MORE OF A CONCERN AS WINDS INCREASE
DURING THE DAY.
&&
.SHORT TERM...(TODAY THROUGH FRIDAY)
ISSUED AT 329 AM EDT WED MAR 12 2014
THE MAIN ITEM OF INTEREST IS THE ONGOING SNOW FALLING ACROSS THE SRN
PORTION OF THE AREA AND WHAT TO DO WITH THE HEADLINES THIS MORNING.
WE WILL HOLD ON TO THE HEADLINES AS THEY ARE FOR NOW AND CONTINUE TO
MONITOR THE POSSIBLE NEED TO UPGRADE IN THE NEAR TERM FOR ANY
HEAVIER BAND THAT MAY SIT OVER AN AREA FOR A PERIOD.
PCPN CHANGED OVER VERY QUICKLY ACROSS THE AREA AROUND 04-06Z THIS
MORNING...JUST AS THE MORE WIDESPREAD PCPN BEGAN TO MOVE IN FROM THE
SW AND THE COLDER AIR WAS BEING DRAWN DOWN FROM THE NORTH. IT
APPEARS THAT WE ARE SEEING THE NRN EXTENT OF THE BETTER PCPN NOW
SHAPING UP FROM ROUGHLY GRAND HAVEN TO ALMA. THE SHORT TERM HI-RES
MODELS ARE INDICATING THAT THIS EXTENT SHOULD HOLD FOR THE NEXT
COUPLE OF HOURS. THIS OCCURS AS WE HAVE THE NRN STREAM AND SRN
STREAM THAT WILL BE OFFSETTING EACH OTHERS PUSH. THE NRN STREAM WILL
EVENTUALLY DOMINATE AND PUSH THE HEAVIER FGEN SOUTH AND EAST OUT OF
THE AREA.
THE FAVORED AREA FOR THE HEAVIEST SNOW CONTINUES TO LOOK LIKE IT
WILL BE WHERE WE CURRENTLY HAVE THE WARNINGS OUT ACROSS CALHOUN AND
JACKSON COUNTIES. THIS IS WHERE THE SNOW WILL BE FALLING THE
LONGEST. IT ALSO APPEARS THAT THE HEAVIER BANDS MOVING UP FROM
INDIANA WILL ALSO ENHANCE THE SNOW ACROSS THE WARNING AREA. WINDS
WILL BE KICKING UP THIS MORNING AS THE STRONGER GRADIENT MOVES OVER
THE AREA. THE SNOW WILL INITIALLY BE A LITTLE TOO WET FOR BLOWING
AND DRIFTING. AS COLDER AIR CONTINUES TO MOVE IN...THE SNOW WILL
BECOME A LITTLE MORE FAVORABLE FOR BLOWING AND DRIFTING.
IN THE ADVISORY AREA...WE EXPECT SOME DECENT SNOW RATES TO OCCUR FOR
THE NEXT FEW HOURS. WE EXPECT THAT BY 12Z ALREADY THAT THE SNOW WILL
BE DIMINISHING IN INTENSITY AND ENDING FROM THE NORTH AND WEST AS
THE STRONGEST PHASED MID LEVEL FGEN MIGRATES SE. BLOWING AND
DRIFTING SNOW WILL GRADUALLY BECOME MORE LIKELY TOWARD THE END OF
THE EVENT IN THIS AREA ALSO. THE THREAT SHOULD DIMINISH ONCE THE
SNOW STOPS FALL THIS MORNING. THE WIDESPREAD PCPN IS EXPECTED TO
COME TO AN END AT ALL LOCATIONS BY 18Z THIS AFTERNOON. WE HAVE
CONTINUED TO LEAVE A SMALL CHC OF SNOW SHOWERS IN THROUGH THE
AFTERNOON WITH THE PASSAGE OF THE UPPER TROUGH.
STRONG SUBSIDENCE BUILDING IN BEHIND THE TROUGH WILL ALLOW FOR
CLEARING TO WORK IN FROM THE NW LATER THIS AFTERNOON. WE CONTINUE TO
EXPECT AN ALMOST IDEAL RADIATIONAL COOLING SITUATION FOR TONIGHT.
SKIES WILL HAVE CLEARED OUT LATE THIS AFTERNOON...AND THE SFC RIDGE
WILL MOVE IN SQUARELY DURING THE OVERNIGHT PERIOD. WITH THE DRY AND
COLD ARCTIC AIR MASS EXPECTED TO BE IN PLACE...TEMPS WILL LIKELY
FREE FALL TONIGHT AFTER SLOWLY FALLING TEMPS DURING THE DAY TODAY.
WE ARE LIKELY LOOKING AT RECORD LOWS FOR 3/13. PLEASE SEE THE
CLIMATE SECTION BELOW FOR MORE DETAILS.
A FAIRLY QUIET PERIOD CAN THEN BE EXPECTED FOR THE THU THROUGH FRI
TIME FRAME WITH MODERATING TEMPS...ESPECIALLY ON FRI. THU CONTINUES
TO LOOK LIKE A MUCH BELOW AVERAGE DAY WITH LITTLE TEMP ADVECTION
EXPECTED UNTIL LATE IN THE DAY. TEMPS WILL LIKELY RISE THROUGH THU
NIGHT AND INTO FRI AS STRONGER WAA TAKES PLACE. IT LOOKS LIKE A BAND
OF MID CLOUDS MOVE THROUGH AT THE LEADING EDGE OF THE WARMER AIR
ALOFT. A SMALL CHANCE OF PCPN WILL BE POSSIBLE ACROSS THE NRN
COUNTIES ON FRI AS LOW PRESSURE MOVES ACROSS LAKE SUPERIOR AND INTO
ONTARIO. DEEPER MOISTURE IS SHOWN TO BE PRESENT UP NORTH.
.LONG TERM...(FRIDAY NIGHT THROUGH TUESDAY)
ISSUED AT 329 AM EDT WED MAR 12 2014
DID NOT MAKE MAJOR CHANGES TO THE GOING LONG TERM FORECAST. GFS AND
ECMWF ARE SIMILAR UNTIL EARLY NEXT WEEK. TEMPERATURES THROUGH THE
PERIOD WILL GENERALLY BE BELOW NORMAL.
AS FOR THE DETAILS...MAINTAINED A CHANCE OF RAIN/SNOW CHANGING TO
SNOW FRIDAY NIGHT AS A COLD FRONT DROPS SOUTH INTO THE AREA. 850MB
TEMPS COOL TO -5 TO -10 C BY 12Z SATURDAY SO THE CHANGEOVER STILL
LOOKS GOOD. THAT SAID...PRECIPITATION DOES NOT LOOK SIGNIFICANT BY
ANY MEANS. STILL HAVE 20 PCT POPS FOR SATURDAY AS THERE WILL LIKELY
BE SOME SNOW SHOWERS AROUND GIVEN THE NORTHWEST FLOW COLD AIR
ADVECTION AND UPPER TROUGHING. AGAIN...LIGHT PRECIPITATION IS
EXPECTED.
SATURDAY NIGHT THROUGH MONDAY NIGHT MAINTAINED A DRY FORECAST WITH
HIGH PRESSURE SHIFTING THROUGH THE GREAT LAKES REGION.
MODELS HAVE DIFFERING SOLUTIONS REGARDING THE TUES/WED SYSTEM OF
NEXT WEEK. THE GFS IS FARTHER NORTH BRINGING SOUTHERLY FLOW INTO THE
AREA...WHILE TH ECMWF IS SOUTH PLACING US NORTH OF A WARM FRONT.
HAVE SOME TIME TO GET THIS WORKED OUT...BUT MODELS LEAD TO A LOW
CONFIDENCE FORECAST AT THIS POINT FOR MID NEXT WEEK. MIXED PRECIP IN
THE FORECAST FOR NOW GIVEN THE UNCERTAINTY.
&&
.AVIATION...(FOR THE 12Z TAFS THROUGH 12Z THURSDAY MORNING)
ISSUED AT 747 AM EDT WED MAR 12 2014
LIFR AND IFR CONDITIONS REMAIN IN THE HEAVIER SNOW BANDS EXTENDING
FROM THE KAZO AND KBTL AREAS EAST TOWARDS KLAN AND KJXN. THE SNOW
WILL QUICKLY LIFT EAST AND DIMINISH THROUGH 16Z THIS MORNING. THIS
AFTERNOON...EXPECTING MVFR CEILINGS TO REMAIN WITH VFR VSBY/S IN
MANY LOCATIONS. THERE MAY BE SOME BRIEF TIMES WHERE THE STRONG
NORTH WINDS OF 15 TO 25 KNOTS CREATE MVFR VSBY/S DUE TO BLOWING
SNOW. AT THIS POINT NOT SURE HOW WIDESPREAD THE BLOWING SNOW WILL
BE THIS AFTERNOON AS THE SNOW HAS HAD A HIGHER MOISTURE CONTENT.
SO...BOTTOM LINE TODAY...IFR/LIFR SNOW THIS MORNING LIFTING OUT
TOWARDS MIDDAY DAY. STRONG NORTH WINDS THIS AFTERNOON.
VFR CONDITIONS ARE EXPECTED FROM LATE THIS AFTERNOON...AFTER
22Z...THROUGH TONIGHT. SKIES SHOULD ACTUALLY BECOME MOSTLY CLEAR
TONIGHT.
&&
.HYDROLOGY...
ISSUED AT 302 PM EDT TUE MAR 11 2014
RISES UNDERWAY AND TODAYS WARMER THAN EXPECTED TEMPERATURES ARE
ALLOWING FOR SOME ENHANCED RUNOFF. STILL WE ARE NOT EXPECTING ANY
HIGHER IMPACTS FROM THIS INITIAL SURGE OF RUNOFF. WITH ICE IN THE
RIVERS...WE STILL NEED TO MONITOR FORECAST POINTS CLOSELY.
TEMPERATURES WILL FALL WELL BELOW FREEZING ON WEDNESDAY AND THAT
SHOULD LOCK UP THE RUNOFF FOR A FEW DAYS.
&&
.CLIMATE...
ISSUED AT 329 AM EDT WED MAR 12 2014
THE COLD AIR MASS COMING IN...COMBINED WITH DIMINISHING WINDS AND
CLEARING SKIES TONIGHT WILL ALLOW TEMPERATURES TO APPROACH OR EXCEED
RECORDS FOR MARCH 13TH. THERE IS EVEN A SLIGHT CHANCE TEMPERATURES
COULD FALL QUICK ENOUGH BEFORE THE END OF THE CLIMATE DAY FOR TODAY
THAT RECORDS COULD BE APPROACHED FOR THE 12TH. HERE ARE THE RECORDS:
3/12 3/13
GRAND RAPIDS 2 DEGREES - 1993...1948 5 DEGREES - 1926
MUSKEGON 2 DEGREES - 1979 2 DEGREES - 1912
LANSING -3 DEGREES - 1877 -3 DEGREES - 1960
&&
.GRR WATCHES/WARNINGS/ADVISORIES...
MI...WINTER WEATHER ADVISORY UNTIL 3 PM EDT THIS AFTERNOON FOR
MIZ057>059-064>067-071-072.
WINTER STORM WARNING UNTIL 3 PM EDT THIS AFTERNOON FOR MIZ073-
074.
LM...NONE.
&&
$$
UPDATE...WDM
SYNOPSIS...NJJ
SHORT TERM...NJJ
LONG TERM...DUKE
AVIATION...DUKE
HYDROLOGY...MJS
CLIMATE...NJJ
AREA FORECAST DISCUSSION
NWS GRAND RAPIDS MI
942 AM EDT WED MAR 12 2014
LATEST UPDATE...
UPDATE
.SYNOPSIS...
ISSUED AT 329 AM EDT WED MAR 12 2014
SNOW FALLING ACROSS THE SOUTHERN TWO THIRDS OF THE AREA THIS MORNING
WILL GRADUALLY END THIS MORNING AND INTO EARLY THIS AFTERNOON FROM
NW TO SE. HIGHEST SNOW ACCUMULATIONS WILL BE FOUND SOUTH OF I-69.
SOME BLOWING AND DRIFTING SNOW WILL BE POSSIBLE AS WIND INCREASE
THIS MORNING. SNOW AND CLOUDS WILL CLEAR OUT BY TONIGHT...ALLOWING
FOR A RECORD COLD NIGHT FOR THE AREA.
AFTER ANOTHER COLD DAY ON THURSDAY...TEMPERATURES WILL WARM BACK UP
FOR FRIDAY WITH A SMALL CHANCE OF RAIN UP NORTH IN THE AFTERNOON.
COLDER AIR AND A CHANCE FOR SNOW SHOWERS WILL MOVE BACK IN FOR
SATURDAY.
&&
.UPDATE...
ISSUED AT 942 AM EDT WED MAR 12 2014
GREATEST SNOWFALL REPORTS SO FAR HAVE RANGED FROM 6 TO 7.5 INCHES
ACROSS VAN BUREN...KALAMAZOO...CALHOUN...AND INGHAM COUNTIES. WE ARE
IN THE PROCESS OF SOLICITING REPORTS FROM JACKSON COUNTY.
MOST INTENSE SNOWFALL ASSOCIATED WITH A PRONOUNCED FGEN BAND IS
EXITING OUR SOUTHEASTERN FORECAST AREA. EXPECT SNOWFALL RATES TO
TAPER SIGNIFICANTLY OVER THE NEXT HOUR AS AN UPPER POTENTIAL
VORTICITY MAXIMUM SEEN ON WATER VAPOR/IR SATELLITE CHANNELS LIFTS
NORTHEAST OUT OF OUR SOUTHEAST FORECAST AREA. LATEST HRRR GUIDANCE
INDICATES THE TRAILING EDGE OF PRECIPITATION /CURRENTLY ALONG A
MOUNT PLEASANT TO HOLLAND LINE/ WILL EXIT THE FORECAST AREA BY 2
PM. AS SNOW RATES DECREASE WE EXPECT AN UPTICK IN SNOW RATIOS WHICH
MAKES BLOWING/DRIFTING SNOW MORE OF A CONCERN AS WINDS INCREASE
DURING THE DAY.
&&
.SHORT TERM...(TODAY THROUGH FRIDAY)
ISSUED AT 329 AM EDT WED MAR 12 2014
THE MAIN ITEM OF INTEREST IS THE ONGOING SNOW FALLING ACROSS THE SRN
PORTION OF THE AREA AND WHAT TO DO WITH THE HEADLINES THIS MORNING.
WE WILL HOLD ON TO THE HEADLINES AS THEY ARE FOR NOW AND CONTINUE TO
MONITOR THE POSSIBLE NEED TO UPGRADE IN THE NEAR TERM FOR ANY
HEAVIER BAND THAT MAY SIT OVER AN AREA FOR A PERIOD.
PCPN CHANGED OVER VERY QUICKLY ACROSS THE AREA AROUND 04-06Z THIS
MORNING...JUST AS THE MORE WIDESPREAD PCPN BEGAN TO MOVE IN FROM THE
SW AND THE COLDER AIR WAS BEING DRAWN DOWN FROM THE NORTH. IT
APPEARS THAT WE ARE SEEING THE NRN EXTENT OF THE BETTER PCPN NOW
SHAPING UP FROM ROUGHLY GRAND HAVEN TO ALMA. THE SHORT TERM HI-RES
MODELS ARE INDICATING THAT THIS EXTENT SHOULD HOLD FOR THE NEXT
COUPLE OF HOURS. THIS OCCURS AS WE HAVE THE NRN STREAM AND SRN
STREAM THAT WILL BE OFFSETTING EACH OTHERS PUSH. THE NRN STREAM WILL
EVENTUALLY DOMINATE AND PUSH THE HEAVIER FGEN SOUTH AND EAST OUT OF
THE AREA.
THE FAVORED AREA FOR THE HEAVIEST SNOW CONTINUES TO LOOK LIKE IT
WILL BE WHERE WE CURRENTLY HAVE THE WARNINGS OUT ACROSS CALHOUN AND
JACKSON COUNTIES. THIS IS WHERE THE SNOW WILL BE FALLING THE
LONGEST. IT ALSO APPEARS THAT THE HEAVIER BANDS MOVING UP FROM
INDIANA WILL ALSO ENHANCE THE SNOW ACROSS THE WARNING AREA. WINDS
WILL BE KICKING UP THIS MORNING AS THE STRONGER GRADIENT MOVES OVER
THE AREA. THE SNOW WILL INITIALLY BE A LITTLE TOO WET FOR BLOWING
AND DRIFTING. AS COLDER AIR CONTINUES TO MOVE IN...THE SNOW WILL
BECOME A LITTLE MORE FAVORABLE FOR BLOWING AND DRIFTING.
IN THE ADVISORY AREA...WE EXPECT SOME DECENT SNOW RATES TO OCCUR FOR
THE NEXT FEW HOURS. WE EXPECT THAT BY 12Z ALREADY THAT THE SNOW WILL
BE DIMINISHING IN INTENSITY AND ENDING FROM THE NORTH AND WEST AS
THE STRONGEST PHASED MID LEVEL FGEN MIGRATES SE. BLOWING AND
DRIFTING SNOW WILL GRADUALLY BECOME MORE LIKELY TOWARD THE END OF
THE EVENT IN THIS AREA ALSO. THE THREAT SHOULD DIMINISH ONCE THE
SNOW STOPS FALL THIS MORNING. THE WIDESPREAD PCPN IS EXPECTED TO
COME TO AN END AT ALL LOCATIONS BY 18Z THIS AFTERNOON. WE HAVE
CONTINUED TO LEAVE A SMALL CHC OF SNOW SHOWERS IN THROUGH THE
AFTERNOON WITH THE PASSAGE OF THE UPPER TROUGH.
STRONG SUBSIDENCE BUILDING IN BEHIND THE TROUGH WILL ALLOW FOR
CLEARING TO WORK IN FROM THE NW LATER THIS AFTERNOON. WE CONTINUE TO
EXPECT AN ALMOST IDEAL RADIATIONAL COOLING SITUATION FOR TONIGHT.
SKIES WILL HAVE CLEARED OUT LATE THIS AFTERNOON...AND THE SFC RIDGE
WILL MOVE IN SQUARELY DURING THE OVERNIGHT PERIOD. WITH THE DRY AND
COLD ARCTIC AIR MASS EXPECTED TO BE IN PLACE...TEMPS WILL LIKELY
FREE FALL TONIGHT AFTER SLOWLY FALLING TEMPS DURING THE DAY TODAY.
WE ARE LIKELY LOOKING AT RECORD LOWS FOR 3/13. PLEASE SEE THE
CLIMATE SECTION BELOW FOR MORE DETAILS.
A FAIRLY QUIET PERIOD CAN THEN BE EXPECTED FOR THE THU THROUGH FRI
TIME FRAME WITH MODERATING TEMPS...ESPECIALLY ON FRI. THU CONTINUES
TO LOOK LIKE A MUCH BELOW AVERAGE DAY WITH LITTLE TEMP ADVECTION
EXPECTED UNTIL LATE IN THE DAY. TEMPS WILL LIKELY RISE THROUGH THU
NIGHT AND INTO FRI AS STRONGER WAA TAKES PLACE. IT LOOKS LIKE A BAND
OF MID CLOUDS MOVE THROUGH AT THE LEADING EDGE OF THE WARMER AIR
ALOFT. A SMALL CHANCE OF PCPN WILL BE POSSIBLE ACROSS THE NRN
COUNTIES ON FRI AS LOW PRESSURE MOVES ACROSS LAKE SUPERIOR AND INTO
ONTARIO. DEEPER MOISTURE IS SHOWN TO BE PRESENT UP NORTH.
.LONG TERM...(FRIDAY NIGHT THROUGH TUESDAY)
ISSUED AT 329 AM EDT WED MAR 12 2014
DID NOT MAKE MAJOR CHANGES TO THE GOING LONG TERM FORECAST. GFS AND
ECMWF ARE SIMILAR UNTIL EARLY NEXT WEEK. TEMPERATURES THROUGH THE
PERIOD WILL GENERALLY BE BELOW NORMAL.
AS FOR THE DETAILS...MAINTAINED A CHANCE OF RAIN/SNOW CHANGING TO
SNOW FRIDAY NIGHT AS A COLD FRONT DROPS SOUTH INTO THE AREA. 850MB
TEMPS COOL TO -5 TO -10 C BY 12Z SATURDAY SO THE CHANGEOVER STILL
LOOKS GOOD. THAT SAID...PRECIPITATION DOES NOT LOOK SIGNIFICANT BY
ANY MEANS. STILL HAVE 20 PCT POPS FOR SATURDAY AS THERE WILL LIKELY
BE SOME SNOW SHOWERS AROUND GIVEN THE NORTHWEST FLOW COLD AIR
ADVECTION AND UPPER TROUGHING. AGAIN...LIGHT PRECIPITATION IS
EXPECTED.
SATURDAY NIGHT THROUGH MONDAY NIGHT MAINTAINED A DRY FORECAST WITH
HIGH PRESSURE SHIFTING THROUGH THE GREAT LAKES REGION.
MODELS HAVE DIFFERING SOLUTIONS REGARDING THE TUES/WED SYSTEM OF
NEXT WEEK. THE GFS IS FARTHER NORTH BRINGING SOUTHERLY FLOW INTO THE
AREA...WHILE TH ECMWF IS SOUTH PLACING US NORTH OF A WARM FRONT.
HAVE SOME TIME TO GET THIS WORKED OUT...BUT MODELS LEAD TO A LOW
CONFIDENCE FORECAST AT THIS POINT FOR MID NEXT WEEK. MIXED PRECIP IN
THE FORECAST FOR NOW GIVEN THE UNCERTAINTY.
&&
.AVIATION...(FOR THE 12Z TAFS THROUGH 12Z THURSDAY MORNING)
ISSUED AT 747 AM EDT WED MAR 12 2014
LIFR AND IFR CONDITIONS REMAIN IN THE HEAVIER SNOW BANDS EXTENDING
FROM THE KAZO AND KBTL AREAS EAST TOWARDS KLAN AND KJXN. THE SNOW
WILL QUICKLY LIFT EAST AND DIMINISH THROUGH 16Z THIS MORNING. THIS
AFTERNOON...EXPECTING MVFR CEILINGS TO REMAIN WITH VFR VSBY/S IN
MANY LOCATIONS. THERE MAY BE SOME BRIEF TIMES WHERE THE STRONG
NORTH WINDS OF 15 TO 25 KNOTS CREATE MVFR VSBY/S DUE TO BLOWING
SNOW. AT THIS POINT NOT SURE HOW WIDESPREAD THE BLOWING SNOW WILL
BE THIS AFTERNOON AS THE SNOW HAS HAD A HIGHER MOISTURE CONTENT.
SO...BOTTOM LINE TODAY...IFR/LIFR SNOW THIS MORNING LIFTING OUT
TOWARDS MIDDAY DAY. STRONG NORTH WINDS THIS AFTERNOON.
VFR CONDITIONS ARE EXPECTED FROM LATE THIS AFTERNOON...AFTER
22Z...THROUGH TONIGHT. SKIES SHOULD ACTUALLY BECOME MOSTLY CLEAR
TONIGHT.
&&
.HYDROLOGY...
ISSUED AT 302 PM EDT TUE MAR 11 2014
RISES UNDERWAY AND TODAYS WARMER THAN EXPECTED TEMPERATURES ARE
ALLOWING FOR SOME ENHANCED RUNOFF. STILL WE ARE NOT EXPECTING ANY
HIGHER IMPACTS FROM THIS INITIAL SURGE OF RUNOFF. WITH ICE IN THE
RIVERS...WE STILL NEED TO MONITOR FORECAST POINTS CLOSELY.
TEMPERATURES WILL FALL WELL BELOW FREEZING ON WEDNESDAY AND THAT
SHOULD LOCK UP THE RUNOFF FOR A FEW DAYS.
&&
.CLIMATE...
ISSUED AT 329 AM EDT WED MAR 12 2014
THE COLD AIR MASS COMING IN...COMBINED WITH DIMINISHING WINDS AND
CLEARING SKIES TONIGHT WILL ALLOW TEMPERATURES TO APPROACH OR EXCEED
RECORDS FOR MARCH 13TH. THERE IS EVEN A SLIGHT CHANCE TEMPERATURES
COULD FALL QUICK ENOUGH BEFORE THE END OF THE CLIMATE DAY FOR TODAY
THAT RECORDS COULD BE APPROACHED FOR THE 12TH. HERE ARE THE RECORDS:
3/12 3/13
GRAND RAPIDS 2 DEGREES - 1993...1948 5 DEGREES - 1926
MUSKEGON 2 DEGREES - 1979 2 DEGREES - 1912
LANSING -3 DEGREES - 1877 -3 DEGREES - 1960
&&
.GRR WATCHES/WARNINGS/ADVISORIES...
MI...WINTER WEATHER ADVISORY UNTIL 3 PM EDT THIS AFTERNOON FOR
MIZ057>059-064>067-071-072.
WINTER STORM WARNING UNTIL 3 PM EDT THIS AFTERNOON FOR MIZ073-
074.
LM...NONE.
&&
$$
UPDATE...TJT
SYNOPSIS...NJJ
SHORT TERM...NJJ
LONG TERM...DUKE
AVIATION...DUKE
HYDROLOGY...MJS
CLIMATE...NJJ
AREA FORECAST DISCUSSION
NWS MARQUETTE MI
743 AM EDT WED MAR 12 2014
.SHORT TERM...(TODAY AND TONIGHT)
ISSUED AT 403 AM EDT WED MAR 12 2014
THE COLD FRONT THAT SHIFTED SOUTH ACROSS UPPER MICHIGAN LATE
YESTERDAY AFTERNOON AND EVENING PRODUCED SNOW SHOWERS OVER MUCH OF
WESTERN AND CENTRAL UPPER MICHIGAN...WITH THE STRONGEST SHOWERS SEEN
OVER NORTH CENTRAL UPPER MICHIGAN. THIS WAS DUE TO THE NORTH TO
NORTHEAST WINDS PROVIDING TERRAIN ENHANCEMENT TO THE LIGHTER SNOW
SHOWERS AND ENDED UP PRODUCING ABOUT AN INCH OF SNOW AT OUR OFFICE
THROUGH 2AM. THE INTENSITY HAS REALLY DIMINISHED OVER THE LAST HOUR
OR TWO DUE TO THE DRY AIR (ASSOCIATED WITH THE HIGH OVER NORTHWEST
ONTARIO) THAT HAS BEEN SURGING SOUTH ACROSS LAKE SUPERIOR ON IR
SATELLITE. WITH LIMITED BREAKS IN THE ICE...THE COLD AIR (RAP
ANALYZED 900MB TEMPERATURES OF -17C) HAS ONLY BEEN ABLE TO PRODUCE
A COUPLE LAKE EFFECT CLOUD STREAMERS OFF THE OPEN AREA NEAR ISLE
ROYALE AND THAT IS STRETCHING TOWARDS AREAS SOUTHWEST OF THE
PORCUPINE MOUNTAINS. THIS DRYING ABOVE 900MB HAS LED TO SIGNIFICANT
ADJUSTMENTS TO THE GOING FORECAST.
SINCE THE HIGH WILL CONTINUE TO SLIDE SOUTHEAST OVER THE AREA
THROUGH THE DAY TODAY...HAVE TRENDED THE FORECAST TOWARDS A FASTER
END TO THE SNOW. WOULD EXPECT THE CLOUDS AND LIGHT SNOW SHOWERS OR
FLURRIES TO REMAIN THE LONGEST OVER THE NORTH CENTRAL U.P. WHERE THE
NORTHEAST WINDS WILL REMAIN MOST FAVORABLE. LOOKING AT 00Z NAM/GFS
SOUNDINGS THEY DO HOLD ONTO MOISTURE RIGHT BELOW THAT INVERSION INTO
THE AFTERNOON FOR KSAW...BUT THE LAST SEVERAL RAP RUNS REALLY SCOUR
THAT MOISTURE OUT. THUS...WILL KEEP THE TREND TOWARDS PARTLY CLOUDY
SKIES BY AFTERNOON OVER THE NORTH CENTRAL AND PARTLY CLOUDY TO
MOSTLY SUNNY ELSEWHERE AWAY FROM THE UPSLOPE FLOW. AS FOR THE SNOW
SHOWERS...HAVE CUT THAT BACK SIGNIFICANTLY...WITH THEM MAINLY BEING
CONFINED TO THE NORTH CENTRAL FOR THE NEXT FEW HOURS AND THEN
QUICKLY DIMINISHING DURING THE MORNING WITH THE WINDS STARTING TO
BACK MORE TO THE NORTH-NORTHWEST. WILL MONITOR CLOUD/SNOW TRENDS
THROUGH DAY BREAK AND MAY NEED TO DIMINISH THEM EVEN EARLIER THAN
THE GOING FORECAST.
WITH THE COLD AIR ALOFT THAT IS MOVING OVER THE AREA...EXPECT THE
EARLY MORNING TEMPERATURES TO CONTINUE TO SLOWLY FALL. THE 3AM OBS
(RANGING FROM 9 DEGREES IN COPPER HARBOR AND 27 IN MENOMINEE) WILL
LIKELY BE THE WARMEST VALUES FOR THE RESPECTIVE LOCATIONS AND ONLY
HAVE HIGHS IN THE UPPER SINGLE DIGITS TO THE NORTH AND THE MID
TEENS TO THE SOUTH. AM A LITTLE CONCERNED THE WARM MARCH SUN THIS
AFTERNOON COULD PRODUCE HIGHS A LITTLE WARMER THAN EXPECTED AND DID
ADJUST INLAND WEST AREAS UP A COUPLE DEGREES TO ACCOUNT FOR THIS.
FOR SEVERAL COOP SITES OVER THE WEST THAT REPORT ON A 7AM-7AM
CYCLE...DAYTIME HIGHS TODAY COULD BE NEAR OR BREAK RECORD LOW HIGHS
FOR THE OBS THAT WILL BE REPORTED ON MARCH 13TH.
WITH THE HIGH BEING OVER DIRECTLY OVER THE U.P. THIS EVENING AND
CLEAR SKIES...EXPECT TEMPERATURES TO QUICKLY DROP OVER THE WEST AND
CENTRAL INITIALLY WITH THE LIGHT WINDS. THOSE AREAS SHOULD SEE
THEIR LOWS EARLIER THAN THE EAST DUE TO THE HIGH SHIFTING SOUTHEAST
OF THE AREA LATE TONIGHT AND ALLOWING SOUTHERLY FLOW TO DEVELOP. IN
ADDITION...MID CLOUDS WILL BE ARRIVING OVER THE WEST LATE IN
RESPONSE TO INCREASING WARM AIR ADVECTION ALOFT AND COULD EVEN LEAD
TO SOME LIGHT SNOW SHOWERS OVER THE WESTERN QUARTER OF LAKE
SUPERIOR BEFORE 12Z. OVER THE EAST...THE LATER WEAKENING OF THE
WINDS SHOULDN/T HAVE MUCH AFFECT ON THE LOWS AND EXPECT THE LONGER
RADIATIONAL COOLING TIME TO ALLOW LOWS TO EASILY FALL INTO THE
TEENS BELOW ZERO. WILL CONTINUE TO FOLLOW THE NH/REGIONAL CANADIAN
MODEL FOR TEMPERATURES OVER THE EAST...DUE TO IT/S GREAT
PERFORMANCE THIS WINTER ON THESE TYPES OF NIGHTS. DID TREND LOWS
DOWN A LITTLE FOR SOME OF THE TRADITIONAL COLD SPOTS (RAWS SITES
LIKE DOE LAKE AND SPINCICH LAKE)...WHICH WILL LIKELY SEE VALUES
FALLING INTO THE LOWER -20S. CURRENT FORECAST HAS LOWS
NEARING/BREAKING RECORDS FOR MANISTIQUE (-7 IN 1948) AND MUNISING
(-10 IN 1926).
.LONG TERM...(THURSDAY THROUGH TUESDAY)
ISSUED AT 513 AM EDT WED MAR 12 2014
THE OVERALL PATTERN WILL CONTINUE TO BE INFLUENCED BY RIDGING OVER
WRN NOAM AND THE RESULTING DOWNSTREAM TROUGH INTO THE GREAT LAKES
AND NERN CONUS...KEEPING TEMPS MAINLY BELOW NORMAL. A CLIPPER
SHORTWAVE AND LOW MOVING THROUGH THE REGION WILL BRING A WARMUP
FRIDAY WITH A CHANCE OF SOME LIGHT PCPN BUT WILL DRAG MUCH COLDER
AIR INTO THE REGION IN ITS WAKE FOR THE WEEKEND.
THU...AS ARCTIC HIGH PRES SHIFTS TO THE EAST AND MID LEVEL RIDGING
BUILDS TOWARD THE UPPER MS VALLEY...WAA WILL SPREAD CLOUDS
THROUGH UPPER MICHIGAN. ONLY SLIGHT CHANCE POPS FOR LIGHT SNOW WERE
INCLUDED GIVEN ONLY LIMITED MOISTURE AVAILABILITY AND RELATIVELY
SMALL NET ISENTROPIC LIFT AS THE 850-700 MB LAYER WARMS. A LARGE
SPREAD OF HIGH TEMPS IS EXPECTED WITH READINGS RANGING FROM AROUND 20
NEAR ERY TO 40 AT IWD.
THU NIGHT INTO FRI...THE GEM AND ECMWF HAVE REMAINED FARTHER SOUTH
WITH THE TRACK OF THE CLIPPER SHRTWV COMPARED TO THE NAM AND GFS.
EVEN THOUGH THERE IS LINGERING MODEL UNCERTAINTY...THERE SHOULD BE
ENOUGH 700-300 MB QVECTOR CONV WITH THIS FEATURE TO SUPPORT AT LEAST
LOW END PCPN CHANCES OVER MOST OF THE CWA FRI...ESPECIALLY OVER THE
NORTH HALF. ALTHOUGH THERE MAY BE ENOUGH WARM AIR IN THE WARM SECTOR
TO SUPPORT SOME LIGHT RAIN...WET-BULB ZERO HEIGHTS FAVOR MAINLY
SNOW. HIGHS SHOULD STILL CLIMB ABOVE NORMAL INTO THE MID AND UPPER
30S.
FRI NIGHT AND SAT...THE LOW PRESSURE SYSTEM WILL DRAG A COLD FRONT
THROUGH UPPER MI WITH 850 MB TEMPS FALLING TO NEAR -14C BY 12Z/SAT
AND -20C BY 00Z/SUN. THE MOST FAVORABLE PERIOD FOR SNOW SHOWERS...
AIDED BY HEAT/MOISTURE FLUX ACROSS SOME GAPS IN THE ICE COVER AND
UPSLOPE FLOW INTO THE HIGHER TERRAIN...WILL BE BETWEEN 06Z-18Z WHEN
THE GREATER 850-700 MB MOISTURE AND IS PRESENT. ANY SNOW SHOWERS
STILL BE LIGHT...GENERALLY ONLY AN INCH OR TWO AT MOST. TEMPS WILL
STRUGGLE TO AROUND 20 NORTH BUT MAY CLIMB TO THE UPPER 20S SOUTH.
SUN-TUE...AS THE ARCTIC HIGH SETTLES INTO THE REGION SUN...HIGHS
WILL REMAIN IN THE TEENS UNDER MOSTLY SUNNY SKIES AFTER MORNING LOWS
AT OR JUST BELOW ZERO. MODEL DIFFERENCES ARE MUCH GREATER BY MON-TUE
AS THE ECMWF KEEPS MORE TROUGHING AND COLD AIR OVER THE GREAT LAKES
COMPARED TO THE GFS/GEM WHICH KEEPS MOST OF THE PCPN WITH A SHRTWV
AND LOW TO THE SOUTH AND WEST OF UPPER MICHIGAN.
&&
.AVIATION...(FOR THE 12Z TAFS THROUGH 12Z THURSDAY MORNING)
ISSUED AT 743 AM EDT WED MAR 12 2014
DRY AIR ASSOCIATED WITH AN AREA OF HIGH PRESSURE JUST TO THE
NORTHWEST OF LAKE SUPERIOR CONTINUES TO DIMINISH CLOUDS ACROSS LAKE
SUPERIOR...ALTHOUGH THERE AREA A COUPLE LAKE EFFECT BANDS OVER THE
WESTERN HALF OF THE LAKE FROM OPEN WATER NEAR ISLE ROYALE. WITH THE
HIGH MOVING OVER THE U.P. THIS AFTERNOON...EXPECT VFR CONDITIONS TO
REMAIN AT KIWD/KCMX THROUGH THE PERIOD. AT KSAW...UPSLOPE NORTHEAST
WINDS ARE CAUSING MVFR CLOUDS (AND ISOLATED SNOW SHOWERS) TO
LINGER...BUT WOULD EXPECT THOSE TO SCATTER OUT AROUND MID DAY. ONCE
THOSE SCATTER OUT VFR CONDITIONS WILL PREVAIL.
AN APPROACHING CLIPPER SYSTEM FOR THURSDAY NIGHT WILL BRING
INCREASING CLOUDS LATE TONIGHT AND MAYBE A FEW SNOW SHOWERS AT
KIWD/KCMX JUST AFTER THE END OF THE TAF PERIOD.
&&
.MARINE...(FOR THE 4 AM LAKE SUPERIOR FORECAST ISSUANCE)
ISSUED AT 403 AM EDT WED MAR 12 2014
COLD AIR SURGING SOUTH ACROSS LAKE SUPERIOR THIS PAST EVENING LED
TO A PERIOD OF NORTHERLY GUSTS TO 25-30KTS OVER MUCH OF THE LAKE.
THESE WINDS ARE EXPECTED TO QUICKLY DIMINISH TODAY AS AN AREA OF
HIGH PRESSURE IN NORTHWEST ONTARIO QUICKLY SHIFTS SOUTHEAST OVER
THE UPPER GREAT LAKES REGION. THIS HIGH WILL EXIT THE AREA LATE
TONIGHT AND THURSDAY MORNING ALLOWING SOUTHWESTERLY WINDS TO START
TO INCREASE AHEAD OF THE NEXT CLIPPER SYSTEM THAT WILL MOVE ACROSS
LAKE SUPERIOR THURSDAY NIGHT AND FRIDAY MORNING. SOUTHWEST WINDS
MAY INCREASE TO 15-25KTS AHEAD OF THIS LOW...THEN SHIFT TO THE
NORTHWEST AT SIMILAR VALUES ON THE BACK SIDE OF THE LOW. HIGH
PRESSURE WILL THEN BUILD SOUTH FROM CANADA SATURDAY AFTERNOON INTO
SUNDAY AND PRODUCE WEAKENING WINDS.
&&
.MQT WATCHES/WARNINGS/ADVISORIES...
UPPER MICHIGAN...
NONE.
LAKE SUPERIOR...
NONE.
LAKE MICHIGAN...
NONE.
&&
$$
SHORT TERM...SRF
LONG TERM...JLB
AVIATION...SRF
MARINE...SRF
AREA FORECAST DISCUSSION
NWS DETROIT/PONTIAC MI
727 AM EDT WED MAR 12 2014
.AVIATION...
//DISCUSSION...
VLIFR/LIFR RESTRICTION IN MODERATE TO HEAVY SNOW WILL PERSIST FOR
THE BULK OF THE MORNING FROM FNT SOUTHWARD THROUGH THE DTW CORRIDOR.
ADD TO THAT A NORTH WIND GUSTING UP AROUND 30 KNOTS TO COMPLICATE
CONDITIONS FOR AVIATION OPERATIONS BOTH ON THE GROUND AND IN THE
AIR. MBS WILL WAVER BETWEEN IFR AND MVFR AND THESE CONDITIONS WILL
SPREAD SOUTHWARD OVER THE REST OF THE SITES AS AN IMPROVEMENT DURING
LATE MORNING AND EARLY AFTERNOON AS THE STRONG WINTER STORM SYSTEM
EXITS THE AREA. A NEW SURGE OF ARCTIC AIR WILL FOSTER A CLEARING
TREND DURING THE EVENING WITH CLEAR AND COLD CONDITIONS IN PLACE
AFTER MIDNIGHT THROUGH SUNRISE THURSDAY.
FOR DTW... NEAR ZERO VISIBILITY AND SNOWFALL RATES OF 1-2 INCHES PER
HOUR WILL PERSIST THROUGH MID MORNING RESULTING IN TOTAL
ACCUMULATION CLOSER TO THE 9 INCH END OF THE 6-9 INCH RANGE OF THE
FORECAST. IMPROVEMENT WILL THEN BE GRADUAL THROUGH IFR TO MVFR IN
BLOWING SNOW BY EARLY AFTERNOON. THIS WILL BE DUE TO NORTH WIND
GUSTING NEAR 35 KNOTS AT TIMES UNTIL CLOSE TO SUNSET.
//DTW THRESHOLD THREATS...
* MODERATE CONFIDENCE IN 1/4SM VISIBILITY AND 200FT CEILING.
* HIGH CONFIDENCE ON CEILING BELOW 5000 FEET TODAY.
* HIGH CONFIDENCE IN SNOW AS PRECIPITATION TYPE.
&&
.PREV DISCUSSION...ISSUED 353 AM EDT WED MAR 12 2014
SHORT TERM... TODAY AND TONIGHT
A HIGH IMPACT WINTER STORM SYSTEM REMAINS ON TRACK FOR THE SOUTH
HALF OF SE MICHIGAN WITH THE PEAK OF THE EVENT DURING THE MORNING
COMMUTE ALONG AND SOUTH OF THE I-69 CORRIDOR. THE SYSTEM WILL BRING
HEAVY SNOW AND STRONG WIND OVER THE REGION DURING THE MORNING BEFORE
DIMINISHING DURING EARLY AFTERNOON. HEADLINE ADJUSTMENTS CONSIST OF
A WARNING UPGRADE TO LIVINGSTON, SHIAWASSEE, GENESEE, AND LAPEER.
THE CHARACTER OF THIS EVENT CONTINUES TO EXHIBIT A SHARP SNOWFALL
GRADIENT ON THE NORTH FLANK TO THE DEGREE THAT THE NORTHERN REACHES
OF MIDLAND AND BAY COUNTIES WILL SEE JUST A DUSTING OF ACCUMULATION
WHILE LOCATIONS ALONG THE I-69 CORRIDOR COULD SEE 6 INCHES IN 9
HOURS, AND LOCATIONS CLOSE TO THE OHIO BORDER COULD APPROACH 10
INCHES IF MESOSCALE ELEMENTS LINE UP JUST RIGHT. IN ADDITION, STRONG
NORTHERLY WIND GUSTS COULD PRODUCE NEAR BLIZZARD CONDITIONS AT
TIMES. AIDING IN THE DETERMINATION OF HEADLINE ADJUSTMENTS IS THE
00Z MODEL SUITE COMING IN WITH SOLID AGREEMENT ON THE TRACK OF THE
SURFACE LOW DIRECTLY ALONG THE OHIO RIVER TO THE SOUTHWEST
PENNSYLVANIA/WEST VIRGINIA BORDER BY NOON. THAT HELPS ADD CONFIDENCE
TO THE LOCATION, INTENSITY, AND DURATION OF MESOSCALE FORCING
FEATURES TARGETED FOR THE SLIGHT NORTHWARD EXPANSION OF THE WARNING
AREA. IT ALSO REINFORCES THE IDEA OF HIGHLIGHTING THE WIND FOR HURON
AND SANILAC COUNTIES GIVEN THE SHARP GRADIENT OF MEANINGFUL SNOW
ACCUMULATION THERE.
SURFACE OBSERVATIONS AND RADAR DEPICTION AROUND THE MIDNIGHT HOUR
REVEALED THE TENDENCY FOR A RAPID CHANGE TO ALL SNOW IN REGIONS OF
HIGHER PRECIPITATION RATE WITHIN THE LEADING ARM OF MID LEVEL
FRONTAL FORCING. AFTER A BRIEF LULL, AND WITH ADDITIONAL LOW LEVEL
COLD ADVECTION, IT IS NO SURPRISE THAT THIS REGION OF THE SYSTEM HAS
LIT UP AGAIN WITH ALL SNOW AS THE PRIMARY MOISTURE SURGE ARRIVES. A
CLOSED CIRCULATION AND TRUE TROWAL STRUCTURE WILL BE ABSENT FROM THE
SYSTEM BUT A DEEP AND DYNAMIC DEFORMATION ZONE ON THE NW FLANK OF
THE LOW WILL ENSURE A STRONG MESOSCALE RESPONSE TO FORCING AS THE
SYSTEM MOVES THROUGH SE MICHIGAN. THE FIRST SIGNS OF THIS PROCESS IS
THE RAPID CLOUD TOP COOLING IN IR SATELLITE IMAGERY BETWEEN MIDNIGHT
AND 3 AM WITH RADAR COMPOSITE INDICATING A WIDE BAND OF HEAVY
PRECIPITATION FROM NORTHERN MISSOURI INTO OUR AREA ALONG THE I-69
CORRIDOR. CONVECTIVE ELEMENTS TO THE SOUTH ARE MORE INDICATIVE OF
CONVECTIVE INSTABILITY IN THE FRONTAL ZONE BELOW 850 MB, AND THIS IS
WHERE LIGHTNING STRIKES SHOULD REMAIN, BUT SOME THUNDER SNOW WITHIN
THE DEFORMATION AXIS IS NOT OUT OF THE QUESTION AS FAR NORTH AS
METRO DETROIT. MODEL CROSS SECTIONS INDICATE IMPRESSIVE CONVECTIVE
INSTABILITY IN THE 700-500 MB LAYER MATCHING UP WELL WITH THE
OBSERVED BAND FILLING IN OVER THE SOUTH HALF OF SE MICHIGAN. THIS,
ALONG WITH SPECIFIC HUMIDITY OF 3-4 G/KG WILL MAKE MAXIMUM USE OF A
DEEP WEDGE OF FRONTOGENESIS EXCEEDING 100 UNITS. SIMILAR DEPICTION
IN THE LATEST RAP OUTPUT INDICATES THE BURST OF HEAVY SNOWFALL RATES
FROM HIGHER ALTITUDE AND WITH HIGHER SNOW RATIO PERSISTING THROUGH
CENTRAL SECTIONS OF THE REGION WITH A PIVOT OCCURRING IN THE 12-15Z
TIME PERIOD BEFORE MIGRATING SOUTHWARD AND EASTWARD DURING THE LATE
MORNING. THIS IS THE SUSPECTED SOURCE OF OVERACHIEVEMENT IN
SNOWFALL TOTALS ON THE NORTHERN FRINGES OF THE WARNING AREA. FARTHER
SOUTH, THE GOING 6 TO 9 INCH FORECAST LOOKS SOLID AS THE MID LEVEL
FRONTAL ZONE AND DEFORMATION ZONE FILL IN TO FORM ONE SOLID NW FLANK
OF THE SYSTEM WITH 1-2 INCH PER HOUR PEAK RATES FOR LONGER DURATION
THAN POINTS NORTH.
THE SYSTEM WILL EXIT THE AREA BY MID AFTERNOON WITH TRAILING
NORTHERLY FLOW CARRYING IN ANOTHER ROUND OF ARCTIC AIR. DEPENDING ON
THE CLEARING TREND, BELOW ZERO MIN TEMPS ARE ON TARGET WITH FRESH
SNOW COVER BY SUNRISE THURSDAY.
LONG TERM...THURSDAY THROUGH TUESDAY
A QUICK LOOK AT THE LONGWAVE PATTERN THROUGH THE NEXT WEEK SHOW
SPLIT FLOW OVER THE WEST COAST WITH THE TROUGH STILL HOLDING ON OVER
THE EASTERN CONUS. THE JET STREAM IS VERY ACTIVE/ENERGETIC...BOTH
NORTHERN AND SOUTHERN STREAMS...BUT AT THIS POINT IT LOOKS LIKE THE
MAJORITY OF THE PRECIP WILL TRY TO STEER CLEAR OF SOUTHERN MI. THE
GOOD NEWS IS THAT WE ARE STILL GETTING SURGES OF SOUTHERLY FLOW
EVERY THIRD DAY OR SO...BUT THE BAD NEWS IS THAT THESE WARM UPS INTO
THE LOW 40S ARE STRUGGLING TO REACH MID MARCH AVERAGE HIGH TEMPS
WHICH ARE IN THE MID 40S. TO SUM IT UP...THE MARCH
ROLLER COASTER/WAVE TRAIN WILL CONTINUE FOR THE FORESEEABLE FUTURE.
WILL NOW HIT ON A FEW FEATURES OF NOTE IN THE EXTENDED PERIOD.
THURSDAY WILL BE A COLD DAY AS THE MID/UPPER LEVEL ARCTIC TROUGH
REMAINS IN CONTROL WITH NORTHERN EXTENSION OF A HIGH PRESSURE SYSTEM
AT THE SURFACE THAT SLIDE SOUTH BEHIND WEDNESDAYS BIG SYSTEM.
NORTHERLY WINDS WILL BACK TO WESTERLY AS HEIGHTS BUILD THROUGH THE
DAY BUT WE STILL ONLY GET TO 542DAM AT 500MB BY THURSDAY EVENING SO
WE WILL NOT REALIZE THAT INCREASE AT THE SFC DURING DAYLIGHT HOURS.
FRIDAY WE FIND OURSELVES IN BETWEEN THE EXITING HIGH AND A CLIPPER
TRACKING EASTWARD OVER NORTHERN LAKE SUPERIOR. SW TO NE PRESSURE
GRADIENT WILL SET UP GOOD SW FLOW AND WAA. LL JET AT 850MB WILL PEAK
AROUND 45 KNOTS DURING THE AFTERNOON ALTHOUGH WE ONLY LOOK TO MIX UP
TO AROUND 900MB. SHOULD STILL BE FAIRLY BREEZY OUT IN THE AFTERNOON
WITH GUSTS REACHING 20-30 MPH. HIGHS SHOULD REACH INTO THE 40S ONCE
AGAIN. THERE IS A SLIGHT CHANCE THAT A FEW RAIN/SNOW SHOWERS COULD
POP UP LATE FRIDAY OR OVERNIGHT BUT THERE IS NOT MUCH MOISTURE IN
THE COLUMN TO WORK WITH SO WILL CONTINUE TO LEAN TOWARD A DRY
FORECAST. THIS CLIPPER WILL PULL A PAIR OF COLD FRONTS THROUGH THE
REGION WHICH WILL CAUSE TEMPS TO DROP BOTH SATURDAY AND SUNDAY AS
COLDER AND COLDER AIR WORKS INTO THE AREA. SAME HOLDS TRUE FOR
SAT/SUN THAT MODELS ARE TRYING TO POP A FEW SHOWERS BUT DOMINATE
AREA OF HIGH PRESSURE BUILDING IN FROM CANADA WILL CONTINUE TO KEEP
VERY DRY AIR IN PLACE MAKING IT HARD FOR ANYTHING TO DEVELOP. EARLY
NEXT WEEK IT LOOKS LIKE THE NORTHERN AND SOUTHERN STREAMS OF THE
JETS WILL PHASE AGAIN PRODUCING ANOTHER STRONG LOW PRESSURE SYSTEM.
ALL INDICATIONS AT THIS POINT ARE THAT THE STORM WILL DEVELOP MUCH
FURTHER SOUTH AND EAST OF MI.
MARINE...
A STRONG LOW PRESSURE SYSTEM WILL DEEPEN AS IT TRACKS ALONG THE OHIO
RIVER THROUGH THIS AFTERNOON. THE TRACK OF THE STORM PLACES THE
EASTERN GREAT LAKES IN THE TIGHT NORTHEAST TO SOUTHWEST PRESSURE
GRADIENT FIELD WHICH WILL RESULT IN GALE FORCE WINDS TODAY. GALE
WARNINGS ARE IN EFFECT FOR LAKE HURON...LAKE ERIE AND LAKE ST CLAIR
THROUGH THIS EVENING. SEE CURRENT MARINE HEADLINES FOR THE LATEST
INFORMATION. A HIGH PRESSURE SYSTEM WILL THEN DROP THROUGH THE
GREAT LAKES FROM CANADA ALLOWING THE WINDS TO SUBSIDE. YET ANOTHER
LOW PRESSURE SYSTEM WILL MOVE ACROSS NORTHERN LAKE SUPERIOR ON
FRIDAY BRING A RETURN OF MODERATE SOUTHWEST FLOW AND MILDER AIR.
&&
.DTX WATCHES/WARNINGS/ADVISORIES...
MI...WINTER STORM WARNING...MIZ060-MIZ061-MIZ062-MIZ063-MIZ068-MIZ069-
MIZ070-MIZ075-MIZ076-MIZ082-MIZ083...UNTIL 3 PM WEDNESDAY.
WINTER WEATHER ADVISORY...MIZ053-MIZ054-MIZ055...UNTIL 3 PM
WEDNESDAY.
WIND ADVISORY...MIZ049-MIZ055...UNTIL 6 PM WEDNESDAY.
LAKE HURON...
GALE WARNING...LHZ363-LHZ421-LHZ422-LHZ441-LHZ442-LHZ443-LHZ462-
LHZ463-LHZ464...UNTIL 8 PM WEDNESDAY.
LAKE ST CLAIR...
GALE WARNING...UNTIL 8 PM WEDNESDAY.
MI WATERS OF LAKE ERIE...
GALE WARNING...UNTIL 8 PM WEDNESDAY.
&&
$$
AVIATION.....BT
SHORT TERM...BT
LONG TERM....DRK
MARINE.......DRK
YOU CAN OBTAIN YOUR LATEST NATIONAL WEATHER SERVICE FORECASTS ONLINE
AT WWW.WEATHER.GOV/DETROIT (ALL LOWER CASE).
AREA FORECAST DISCUSSION
NWS MARQUETTE MI
514 AM EDT WED MAR 12 2014
.SHORT TERM...(TODAY AND TONIGHT)
ISSUED AT 403 AM EDT WED MAR 12 2014
THE COLD FRONT THAT SHIFTED SOUTH ACROSS UPPER MICHIGAN LATE
YESTERDAY AFTERNOON AND EVENING PRODUCED SNOW SHOWERS OVER MUCH OF
WESTERN AND CENTRAL UPPER MICHIGAN...WITH THE STRONGEST SHOWERS SEEN
OVER NORTH CENTRAL UPPER MICHIGAN. THIS WAS DUE TO THE NORTH TO
NORTHEAST WINDS PROVIDING TERRAIN ENHANCEMENT TO THE LIGHTER SNOW
SHOWERS AND ENDED UP PRODUCING ABOUT AN INCH OF SNOW AT OUR OFFICE
THROUGH 2AM. THE INTENSITY HAS REALLY DIMINISHED OVER THE LAST HOUR
OR TWO DUE TO THE DRY AIR (ASSOCIATED WITH THE HIGH OVER NORTHWEST
ONTARIO) THAT HAS BEEN SURGING SOUTH ACROSS LAKE SUPERIOR ON IR
SATELLITE. WITH LIMITED BREAKS IN THE ICE...THE COLD AIR (RAP
ANALYZED 900MB TEMPERATURES OF -17C) HAS ONLY BEEN ABLE TO PRODUCE
A COUPLE LAKE EFFECT CLOUD STREAMERS OFF THE OPEN AREA NEAR ISLE
ROYALE AND THAT IS STRETCHING TOWARDS AREAS SOUTHWEST OF THE
PORCUPINE MOUNTAINS. THIS DRYING ABOVE 900MB HAS LED TO SIGNIFICANT
ADJUSTMENTS TO THE GOING FORECAST.
SINCE THE HIGH WILL CONTINUE TO SLIDE SOUTHEAST OVER THE AREA
THROUGH THE DAY TODAY...HAVE TRENDED THE FORECAST TOWARDS A FASTER
END TO THE SNOW. WOULD EXPECT THE CLOUDS AND LIGHT SNOW SHOWERS OR
FLURRIES TO REMAIN THE LONGEST OVER THE NORTH CENTRAL U.P. WHERE THE
NORTHEAST WINDS WILL REMAIN MOST FAVORABLE. LOOKING AT 00Z NAM/GFS
SOUNDINGS THEY DO HOLD ONTO MOISTURE RIGHT BELOW THAT INVERSION INTO
THE AFTERNOON FOR KSAW...BUT THE LAST SEVERAL RAP RUNS REALLY SCOUR
THAT MOISTURE OUT. THUS...WILL KEEP THE TREND TOWARDS PARTLY CLOUDY
SKIES BY AFTERNOON OVER THE NORTH CENTRAL AND PARTLY CLOUDY TO
MOSTLY SUNNY ELSEWHERE AWAY FROM THE UPSLOPE FLOW. AS FOR THE SNOW
SHOWERS...HAVE CUT THAT BACK SIGNIFICANTLY...WITH THEM MAINLY BEING
CONFINED TO THE NORTH CENTRAL FOR THE NEXT FEW HOURS AND THEN
QUICKLY DIMINISHING DURING THE MORNING WITH THE WINDS STARTING TO
BACK MORE TO THE NORTH-NORTHWEST. WILL MONITOR CLOUD/SNOW TRENDS
THROUGH DAY BREAK AND MAY NEED TO DIMINISH THEM EVEN EARLIER THAN
THE GOING FORECAST.
WITH THE COLD AIR ALOFT THAT IS MOVING OVER THE AREA...EXPECT THE
EARLY MORNING TEMPERATURES TO CONTINUE TO SLOWLY FALL. THE 3AM OBS
(RANGING FROM 9 DEGREES IN COPPER HARBOR AND 27 IN MENOMINEE) WILL
LIKELY BE THE WARMEST VALUES FOR THE RESPECTIVE LOCATIONS AND ONLY
HAVE HIGHS IN THE UPPER SINGLE DIGITS TO THE NORTH AND THE MID
TEENS TO THE SOUTH. AM A LITTLE CONCERNED THE WARM MARCH SUN THIS
AFTERNOON COULD PRODUCE HIGHS A LITTLE WARMER THAN EXPECTED AND DID
ADJUST INLAND WEST AREAS UP A COUPLE DEGREES TO ACCOUNT FOR THIS.
FOR SEVERAL COOP SITES OVER THE WEST THAT REPORT ON A 7AM-7AM
CYCLE...DAYTIME HIGHS TODAY COULD BE NEAR OR BREAK RECORD LOW HIGHS
FOR THE OBS THAT WILL BE REPORTED ON MARCH 13TH.
WITH THE HIGH BEING OVER DIRECTLY OVER THE U.P. THIS EVENING AND
CLEAR SKIES...EXPECT TEMPERATURES TO QUICKLY DROP OVER THE WEST AND
CENTRAL INITIALLY WITH THE LIGHT WINDS. THOSE AREAS SHOULD SEE
THEIR LOWS EARLIER THAN THE EAST DUE TO THE HIGH SHIFTING SOUTHEAST
OF THE AREA LATE TONIGHT AND ALLOWING SOUTHERLY FLOW TO DEVELOP. IN
ADDITION...MID CLOUDS WILL BE ARRIVING OVER THE WEST LATE IN
RESPONSE TO INCREASING WARM AIR ADVECTION ALOFT AND COULD EVEN LEAD
TO SOME LIGHT SNOW SHOWERS OVER THE WESTERN QUARTER OF LAKE
SUPERIOR BEFORE 12Z. OVER THE EAST...THE LATER WEAKENING OF THE
WINDS SHOULDN/T HAVE MUCH AFFECT ON THE LOWS AND EXPECT THE LONGER
RADIATIONAL COOLING TIME TO ALLOW LOWS TO EASILY FALL INTO THE
TEENS BELOW ZERO. WILL CONTINUE TO FOLLOW THE NH/REGIONAL CANADIAN
MODEL FOR TEMPERATURES OVER THE EAST...DUE TO IT/S GREAT
PERFORMANCE THIS WINTER ON THESE TYPES OF NIGHTS. DID TREND LOWS
DOWN A LITTLE FOR SOME OF THE TRADITIONAL COLD SPOTS (RAWS SITES
LIKE DOE LAKE AND SPINCICH LAKE)...WHICH WILL LIKELY SEE VALUES
FALLING INTO THE LOWER -20S. CURRENT FORECAST HAS LOWS
NEARING/BREAKING RECORDS FOR MANISTIQUE (-7 IN 1948) AND MUNISING
(-10 IN 1926).
.LONG TERM...(THURSDAY THROUGH TUESDAY)
ISSUED AT 513 AM EDT WED MAR 12 2014
THE OVERALL PATTERN WILL CONTINUE TO BE INFLUENCED BY RIDGING OVER
WRN NOAM AND THE RESULTING DOWNSTREAM TROUGH INTO THE GREAT LAKES
AND NERN CONUS...KEEPING TEMPS MAINLY BELOW NORMAL. A CLIPPER
SHORTWAVE AND LOW MOVING THROUGH THE REGION WILL BRING A WARMUP
FRIDAY WITH A CHANCE OF SOME LIGHT PCPN BUT WILL DRAG MUCH COLDER
AIR INTO THE REGION IN ITS WAKE FOR THE WEEKEND.
THU...AS ARCTIC HIGH PRES SHIFTS TO THE EAST AND MID LEVEL RIDGING
BUILDS TOWARD THE UPPER MS VALLEY...WAA WILL SPREAD CLOUDS
THROUGH UPPER MICHIGAN. ONLY SLIGHT CHANCE POPS FOR LIGHT SNOW WERE
INCLUDED GIVEN ONLY LIMITED MOISTURE AVAILABILITY AND RELATIVELY
SMALL NET ISENTROPIC LIFT AS THE 850-700 MB LAYER WARMS. A LARGE
SPREAD OF HIGH TEMPS IS EXPECTED WITH READINGS RANGING FROM AROUND 20
NEAR ERY TO 40 AT IWD.
THU NIGHT INTO FRI...THE GEM AND ECMWF HAVE REMAINED FARTHER SOUTH
WITH THE TRACK OF THE CLIPPER SHRTWV COMPARED TO THE NAM AND GFS.
EVEN THOUGH THERE IS LINGERING MODEL UNCERTAINTY...THERE SHOULD BE
ENOUGH 700-300 MB QVECTOR CONV WITH THIS FEATURE TO SUPPORT AT LEAST
LOW END PCPN CHANCES OVER MOST OF THE CWA FRI...ESPECIALLY OVER THE
NORTH HALF. ALTHOUGH THERE MAY BE ENOUGH WARM AIR IN THE WARM SECTOR
TO SUPPORT SOME LIGHT RAIN...WET-BULB ZERO HEIGHTS FAVOR MAINLY
SNOW. HIGHS SHOULD STILL CLIMB ABOVE NORMAL INTO THE MID AND UPPER
30S.
FRI NIGHT AND SAT...THE LOW PRESSURE SYSTEM WILL DRAG A COLD FRONT
THROUGH UPPER MI WITH 850 MB TEMPS FALLING TO NEAR -14C BY 12Z/SAT
AND -20C BY 00Z/SUN. THE MOST FAVORABLE PERIOD FOR SNOW SHOWERS...
AIDED BY HEAT/MOISTURE FLUX ACROSS SOME GAPS IN THE ICE COVER AND
UPSLOPE FLOW INTO THE HIGHER TERRAIN...WILL BE BETWEEN 06Z-18Z WHEN
THE GREATER 850-700 MB MOISTURE AND IS PRESENT. ANY SNOW SHOWERS
STILL BE LIGHT...GENERALLY ONLY AN INCH OR TWO AT MOST. TEMPS WILL
STRUGGLE TO AROUND 20 NORTH BUT MAY CLIMB TO THE UPPER 20S SOUTH.
SUN-TUE...AS THE ARCTIC HIGH SETTLES INTO THE REGION SUN...HIGHS
WILL REMAIN IN THE TEENS UNDER MOSTLY SUNNY SKIES AFTER MORNING LOWS
AT OR JUST BELOW ZERO. MODEL DIFFERENCES ARE MUCH GREATER BY MON-TUE
AS THE ECMWF KEEPS MORE TROUGHING AND COLD AIR OVER THE GREAT LAKES
COMPARED TO THE GFS/GEM WHICH KEEPS MOST OF THE PCPN WITH A SHRTWV
AND LOW TO THE SOUTH AND WEST OF UPPER MICHIGAN.
&&
.AVIATION...(FOR THE 00Z TAFS THROUGH 00Z WEDNESDAY EVENING)
ISSUED AT 727 PM EDT TUE MAR 11 2014
COLDER AIR CONTINUES TO MOVE INTO THE REGION THIS EVENING WITH
STRATOCU DECK IMPACTING THE THREE TAF SITES. KSAW CIGS HOLDING IN
MVFR RANGE WHILE KIWD AND KCMX ARE EXPECTED TO DROP INTO MVFR LEVELS
BY 3Z. PASSAGE OF A WEAK DISTURBANCE IN THE FLOW ALOFT COMBINED WITH
VERY COLD AIR FLOWING OVER SOME GAPS IN THE ICE COVER ON LAKE
SUPERIOR TO INITIATE -SHSN. VISIBILITIES TO STAY VFR EXCEPT AT KSAW
WHERE THERE WILL BE A PERIOD OF MVFR VISIBILITIES WITH BETTER
UPSLOPE FLOW THERE IN NNE WINDS. DRIER AIR BEGINS MOVING INTO THE
AREA WEDNESDAY MORNING AND WILL SCATTER OUT THE CLOUDS OVER THE
WESTERN TAF SITES BY 12Z AND KSAW BY 15Z...WITH VFR PREVAILING
THROUGH THE LATTER HALF OF THE FORECAST.
&&
.MARINE...(FOR THE 4 AM LAKE SUPERIOR FORECAST ISSUANCE)
ISSUED AT 403 AM EDT WED MAR 12 2014
COLD AIR SURGING SOUTH ACROSS LAKE SUPERIOR THIS PAST EVENING LED
TO A PERIOD OF NORTHERLY GUSTS TO 25-30KTS OVER MUCH OF THE LAKE.
THESE WINDS ARE EXPECTED TO QUICKLY DIMINISH TODAY AS AN AREA OF
HIGH PRESSURE IN NORTHWEST ONTARIO QUICKLY SHIFTS SOUTHEAST OVER
THE UPPER GREAT LAKES REGION. THIS HIGH WILL EXIT THE AREA LATE
TONIGHT AND THURSDAY MORNING ALLOWING SOUTHWESTERLY WINDS TO START
TO INCREASE AHEAD OF THE NEXT CLIPPER SYSTEM THAT WILL MOVE ACROSS
LAKE SUPERIOR THURSDAY NIGHT AND FRIDAY MORNING. SOUTHWEST WINDS
MAY INCREASE TO 15-25KTS AHEAD OF THIS LOW...THEN SHIFT TO THE
NORTHWEST AT SIMILAR VALUES ON THE BACK SIDE OF THE LOW. HIGH
PRESSURE WILL THEN BUILD SOUTH FROM CANADA SATURDAY AFTERNOON INTO
SUNDAY AND PRODUCE WEAKENING WINDS.
&&
.MQT WATCHES/WARNINGS/ADVISORIES...
UPPER MICHIGAN...
NONE.
LAKE SUPERIOR...
NONE.
LAKE MICHIGAN...
NONE.
&&
$$
SHORT TERM...SRF
LONG TERM...JLB
AVIATION...RJT
MARINE...SRF
AREA FORECAST DISCUSSION
NWS MARQUETTE MI
403 AM EDT WED MAR 12 2014
.SHORT TERM...(TODAY AND TONIGHT)
ISSUED AT 403 AM EDT WED MAR 12 2014
THE COLD FRONT THAT SHIFTED SOUTH ACROSS UPPER MICHIGAN LATE
YESTERDAY AFTERNOON AND EVENING PRODUCED SNOW SHOWERS OVER MUCH OF
WESTERN AND CENTRAL UPPER MICHIGAN...WITH THE STRONGEST SHOWERS SEEN
OVER NORTH CENTRAL UPPER MICHIGAN. THIS WAS DUE TO THE NORTH TO
NORTHEAST WINDS PROVIDING TERRAIN ENHANCEMENT TO THE LIGHTER SNOW
SHOWERS AND ENDED UP PRODUCING ABOUT AN INCH OF SNOW AT OUR OFFICE
THROUGH 2AM. THE INTENSITY HAS REALLY DIMINISHED OVER THE LAST HOUR
OR TWO DUE TO THE DRY AIR (ASSOCIATED WITH THE HIGH OVER NORTHWEST
ONTARIO) THAT HAS BEEN SURGING SOUTH ACROSS LAKE SUPERIOR ON IR
SATELLITE. WITH LIMITED BREAKS IN THE ICE...THE COLD AIR (RAP
ANALYZED 900MB TEMPERATURES OF -17C) HAS ONLY BEEN ABLE TO PRODUCE
A COUPLE LAKE EFFECT CLOUD STREAMERS OFF THE OPEN AREA NEAR ISLE
ROYALE AND THAT IS STRETCHING TOWARDS AREAS SOUTHWEST OF THE
PORCUPINE MOUNTAINS. THIS DRYING ABOVE 900MB HAS LED TO SIGNIFICANT
ADJUSTMENTS TO THE GOING FORECAST.
SINCE THE HIGH WILL CONTINUE TO SLIDE SOUTHEAST OVER THE AREA
THROUGH THE DAY TODAY...HAVE TRENDED THE FORECAST TOWARDS A FASTER
END TO THE SNOW. WOULD EXPECT THE CLOUDS AND LIGHT SNOW SHOWERS OR
FLURRIES TO REMAIN THE LONGEST OVER THE NORTH CENTRAL U.P. WHERE THE
NORTHEAST WINDS WILL REMAIN MOST FAVORABLE. LOOKING AT 00Z NAM/GFS
SOUNDINGS THEY DO HOLD ONTO MOISTURE RIGHT BELOW THAT INVERSION INTO
THE AFTERNOON FOR KSAW...BUT THE LAST SEVERAL RAP RUNS REALLY SCOUR
THAT MOISTURE OUT. THUS...WILL KEEP THE TREND TOWARDS PARTLY CLOUDY
SKIES BY AFTERNOON OVER THE NORTH CENTRAL AND PARTLY CLOUDY TO
MOSTLY SUNNY ELSEWHERE AWAY FROM THE UPSLOPE FLOW. AS FOR THE SNOW
SHOWERS...HAVE CUT THAT BACK SIGNIFICANTLY...WITH THEM MAINLY BEING
CONFINED TO THE NORTH CENTRAL FOR THE NEXT FEW HOURS AND THEN
QUICKLY DIMINISHING DURING THE MORNING WITH THE WINDS STARTING TO
BACK MORE TO THE NORTH-NORTHWEST. WILL MONITOR CLOUD/SNOW TRENDS
THROUGH DAY BREAK AND MAY NEED TO DIMINISH THEM EVEN EARLIER THAN
THE GOING FORECAST.
WITH THE COLD AIR ALOFT THAT IS MOVING OVER THE AREA...EXPECT THE
EARLY MORNING TEMPERATURES TO CONTINUE TO SLOWLY FALL. THE 3AM OBS
(RANGING FROM 9 DEGREES IN COPPER HARBOR AND 27 IN MENOMINEE) WILL
LIKELY BE THE WARMEST VALUES FOR THE RESPECTIVE LOCATIONS AND ONLY
HAVE HIGHS IN THE UPPER SINGLE DIGITS TO THE NORTH AND THE MID
TEENS TO THE SOUTH. AM A LITTLE CONCERNED THE WARM MARCH SUN THIS
AFTERNOON COULD PRODUCE HIGHS A LITTLE WARMER THAN EXPECTED AND DID
ADJUST INLAND WEST AREAS UP A COUPLE DEGREES TO ACCOUNT FOR THIS.
FOR SEVERAL COOP SITES OVER THE WEST THAT REPORT ON A 7AM-7AM
CYCLE...DAYTIME HIGHS TODAY COULD BE NEAR OR BREAK RECORD LOW HIGHS
FOR THE OBS THAT WILL BE REPORTED ON MARCH 13TH.
WITH THE HIGH BEING OVER DIRECTLY OVER THE U.P. THIS EVENING AND
CLEAR SKIES...EXPECT TEMPERATURES TO QUICKLY DROP OVER THE WEST AND
CENTRAL INITIALLY WITH THE LIGHT WINDS. THOSE AREAS SHOULD SEE
THEIR LOWS EARLIER THAN THE EAST DUE TO THE HIGH SHIFTING SOUTHEAST
OF THE AREA LATE TONIGHT AND ALLOWING SOUTHERLY FLOW TO DEVELOP. IN
ADDITION...MID CLOUDS WILL BE ARRIVING OVER THE WEST LATE IN
RESPONSE TO INCREASING WARM AIR ADVECTION ALOFT AND COULD EVEN LEAD
TO SOME LIGHT SNOW SHOWERS OVER THE WESTERN QUARTER OF LAKE
SUPERIOR BEFORE 12Z. OVER THE EAST...THE LATER WEAKENING OF THE
WINDS SHOULDN/T HAVE MUCH AFFECT ON THE LOWS AND EXPECT THE LONGER
RADIATIONAL COOLING TIME TO ALLOW LOWS TO EASILY FALL INTO THE
TEENS BELOW ZERO. WILL CONTINUE TO FOLLOW THE NH/REGIONAL CANADIAN
MODEL FOR TEMPERATURES OVER THE EAST...DUE TO IT/S GREAT
PERFORMANCE THIS WINTER ON THESE TYPES OF NIGHTS. DID TREND LOWS
DOWN A LITTLE FOR SOME OF THE TRADITIONAL COLD SPOTS (RAWS SITES
LIKE DOE LAKE AND SPINCICH LAKE)...WHICH WILL LIKELY SEE VALUES
FALLING INTO THE LOWER -20S. CURRENT FORECAST HAS LOWS
NEARING/BREAKING RECORDS FOR MANISTIQUE (-7 IN 1948) AND MUNISING
(-10 IN 1926).
.LONG TERM...(WEDNESDAY NIGHT THROUGH TUESDAY)
ISSUED AT 449 PM EDT TUE MAR 11 2014
THE COLDEST PERIOD IN THE NEAR FUTURE WILL BE THURSDAY
MORNING...WITH TEMPS BOTTOMING OUT IN THE SINGLE DIGITS BELOW 0F
OVER THE W HALF...AND IN THE TEENS BELOW IN THE TRADITIONAL LOW
SPOTS OVER THE E HALF. A COUPLE OF SITES DO HAVE WIND CHILLS FALLING
TO -20 TO -28F AROUND DAYBREAK THURSDAY. ON A POSITIVE NOTE...WINDS
WILL BE VERY RELAXED AS THE SFC HIGH STRETCHING FROM JAMES BAY
THROUGH IA AND N TX AS 00Z THURSDAY MOVES OVER LAKE MI AND LOWER BY
BY 12Z THURSDAY.
WITH THE RETURN OF WAA...DOWNSLOPE SSW WINDS THURSDAY WILL LIKELY
BRING TEMPS AT IWD TO RIGHT AROUND 40F...WHILE OUT E THEY WILL
STRUGGLE TO GET INTO THE MID 20S. THE SFC LOW ACROSS MUCH OF
MANITOBA AT 18Z THURSDAY WILL SHIFT ALONG THE MN/ONTARIO BORDER
AROUND 06Z FRIDAY..AND EXIT ACROSS E LAKE SUPERIOR/E UPPER MI AROUND
18Z FRIDAY. LIGHT WARM FRONT PRECIP WILL STILL BE POSSIBLE THURSDAY
AHEAD OF THE LOW /IN THE FORM OF SNOW/. THE BEST CHANCE OF MIXED
PRECIP WILL LIKELY BE DURING THE DAY FRIDAY OVER S UPPER MI WHEN
850MB TEMPS ARE BEGINNING TO FALL BACK FROM THE 2C READINGS EARLIER
IN THE DAY TO AROUND -4 TO -6C. EVEN THEN IT WILL BE LIGHT...AS THE
BEST SWATH OF MOISTURE STAYS ON THE N SIDE OF THE LOW...ACROSS LAKE
SUPERIOR AND JUST N OF LAKE SUPERIOR IN ONTARIO. SIGNIFICANT
DIFFERENCES STILL REMAIN...ALTHOUGH THE TRACK OF THE SFC LOW IS ONLY
APPROX 100MI APART FRIDAY OVER THE AREA...INSTEAD OF THE 200MI IT
WAS YESTERDAY.
THE POSSIBILITY STILL EXISTS FOR SOME LAKE ENHANCED/EFFECT SNOW
FRIDAY NIGHT INTO SATURDAY WITH THE GAPS IN THE ICE OVER W LAKE
SUPERIOR. OTHERWISE...NO MAJOR CHANGES HAVE BEEN DONE TO THE FCST
BEYOND SATURDAY. COLD HIGH PRESSURE WILL BE THE RULE...SINKING OVER
THE CWA THROUGH SUNDAY NIGHT. ONLY MINIMAL LES POPS KEPT IN FOR THE
COLD N WINDS. BY MONDAY THE HIGH WILL SHIFT E...WITH WARMER AIR
SURGING IN MONDAY NIGHT/TUE AHEAD OF THE NEXT LOW FROM S CENTRAL
CANADA.
&&
.AVIATION...(FOR THE 00Z TAFS THROUGH 00Z WEDNESDAY EVENING)
ISSUED AT 727 PM EDT TUE MAR 11 2014
COLDER AIR CONTINUES TO MOVE INTO THE REGION THIS EVENING WITH
STRATOCU DECK IMPACTING THE THREE TAF SITES. KSAW CIGS HOLDING IN
MVFR RANGE WHILE KIWD AND KCMX ARE EXPECTED TO DROP INTO MVFR LEVELS
BY 3Z. PASSAGE OF A WEAK DISTURBANCE IN THE FLOW ALOFT COMBINED WITH
VERY COLD AIR FLOWING OVER SOME GAPS IN THE ICE COVER ON LAKE
SUPERIOR TO INITIATE -SHSN. VISIBILITIES TO STAY VFR EXCEPT AT KSAW
WHERE THERE WILL BE A PERIOD OF MVFR VISIBILITIES WITH BETTER
UPSLOPE FLOW THERE IN NNE WINDS. DRIER AIR BEGINS MOVING INTO THE
AREA WEDNESDAY MORNING AND WILL SCATTER OUT THE CLOUDS OVER THE
WESTERN TAF SITES BY 12Z AND KSAW BY 15Z...WITH VFR PREVAILING
THROUGH THE LATTER HALF OF THE FORECAST.
&&
.MARINE...(FOR THE 4 AM LAKE SUPERIOR FORECAST ISSUANCE)
ISSUED AT 403 AM EDT WED MAR 12 2014
COLD AIR SURGING SOUTH ACROSS LAKE SUPERIOR THIS PAST EVENING LED
TO A PERIOD OF NORTHERLY GUSTS TO 25-30KTS OVER MUCH OF THE LAKE.
THESE WINDS ARE EXPECTED TO QUICKLY DIMINISH TODAY AS AN AREA OF
HIGH PRESSURE IN NORTHWEST ONTARIO QUICKLY SHIFTS SOUTHEAST OVER
THE UPPER GREAT LAKES REGION. THIS HIGH WILL EXIT THE AREA LATE
TONIGHT AND THURSDAY MORNING ALLOWING SOUTHWESTERLY WINDS TO START
TO INCREASE AHEAD OF THE NEXT CLIPPER SYSTEM THAT WILL MOVE ACROSS
LAKE SUPERIOR THURSDAY NIGHT AND FRIDAY MORNING. SOUTHWEST WINDS
MAY INCREASE TO 15-25KTS AHEAD OF THIS LOW...THEN SHIFT TO THE
NORTHWEST AT SIMILAR VALUES ON THE BACK SIDE OF THE LOW. HIGH
PRESSURE WILL THEN BUILD SOUTH FROM CANADA SATURDAY AFTERNOON INTO
SUNDAY AND PRODUCE WEAKENING WINDS.
&&
.MQT WATCHES/WARNINGS/ADVISORIES...
UPPER MICHIGAN...
NONE.
LAKE SUPERIOR...
NONE.
LAKE MICHIGAN...
NONE.
&&
$$
SHORT TERM...SRF
LONG TERM...KF
AVIATION...RJT
MARINE...SRF
AREA FORECAST DISCUSSION
NWS DETROIT/PONTIAC MI
353 AM EDT WED MAR 12 2014
.SHORT TERM... TODAY AND TONIGHT
A HIGH IMPACT WINTER STORM SYSTEM REMAINS ON TRACK FOR THE SOUTH
HALF OF SE MICHIGAN WITH THE PEAK OF THE EVENT DURING THE MORNING
COMMUTE ALONG AND SOUTH OF THE I-69 CORRIDOR. THE SYSTEM WILL BRING
HEAVY SNOW AND STRONG WIND OVER THE REGION DURING THE MORNING BEFORE
DIMINISHING DURING EARLY AFTERNOON. HEADLINE ADJUSTMENTS CONSIST OF
A WARNING UPGRADE TO LIVINGSTON, SHIAWASSEE, GENESEE, AND LAPEER.
THE CHARACTER OF THIS EVENT CONTINUES TO EXHIBIT A SHARP SNOWFALL
GRADIENT ON THE NORTH FLANK TO THE DEGREE THAT THE NORTHERN REACHES
OF MIDLAND AND BAY COUNTIES WILL SEE JUST A DUSTING OF ACCUMULATION
WHILE LOCATIONS ALONG THE I-69 CORRIDOR COULD SEE 6 INCHES IN 9
HOURS, AND LOCATIONS CLOSE TO THE OHIO BORDER COULD APPROACH 10
INCHES IF MESOSCALE ELEMENTS LINE UP JUST RIGHT. IN ADDITION, STRONG
NORTHERLY WIND GUSTS COULD PRODUCE NEAR BLIZZARD CONDITIONS AT
TIMES. AIDING IN THE DETERMINATION OF HEADLINE ADJUSTMENTS IS THE
00Z MODEL SUITE COMING IN WITH SOLID AGREEMENT ON THE TRACK OF THE
SURFACE LOW DIRECTLY ALONG THE OHIO RIVER TO THE SOUTHWEST
PENNSYLVANIA/WEST VIRGINIA BORDER BY NOON. THAT HELPS ADD CONFIDENCE
TO THE LOCATION, INTENSITY, AND DURATION OF MESOSCALE FORCING
FEATURES TARGETED FOR THE SLIGHT NORTHWARD EXPANSION OF THE WARNING
AREA. IT ALSO REINFORCES THE IDEA OF HIGHLIGHTING THE WIND FOR HURON
AND SANILAC COUNTIES GIVEN THE SHARP GRADIENT OF MEANINGFUL SNOW
ACCUMULATION THERE.
SURFACE OBSERVATIONS AND RADAR DEPICTION AROUND THE MIDNIGHT HOUR
REVEALED THE TENDENCY FOR A RAPID CHANGE TO ALL SNOW IN REGIONS OF
HIGHER PRECIPITATION RATE WITHIN THE LEADING ARM OF MID LEVEL
FRONTAL FORCING. AFTER A BRIEF LULL, AND WITH ADDITIONAL LOW LEVEL
COLD ADVECTION, IT IS NO SURPRISE THAT THIS REGION OF THE SYSTEM HAS
LIT UP AGAIN WITH ALL SNOW AS THE PRIMARY MOISTURE SURGE ARRIVES. A
CLOSED CIRCULATION AND TRUE TROWAL STRUCTURE WILL BE ABSENT FROM THE
SYSTEM BUT A DEEP AND DYNAMIC DEFORMATION ZONE ON THE NW FLANK OF
THE LOW WILL ENSURE A STRONG MESOSCALE RESPONSE TO FORCING AS THE
SYSTEM MOVES THROUGH SE MICHIGAN. THE FIRST SIGNS OF THIS PROCESS IS
THE RAPID CLOUD TOP COOLING IN IR SATELLITE IMAGERY BETWEEN MIDNIGHT
AND 3 AM WITH RADAR COMPOSITE INDICATING A WIDE BAND OF HEAVY
PRECIPITATION FROM NORTHERN MISSOURI INTO OUR AREA ALONG THE I-69
CORRIDOR. CONVECTIVE ELEMENTS TO THE SOUTH ARE MORE INDICATIVE OF
CONVECTIVE INSTABILITY IN THE FRONTAL ZONE BELOW 850 MB, AND THIS IS
WHERE LIGHTNING STRIKES SHOULD REMAIN, BUT SOME THUNDER SNOW WITHIN
THE DEFORMATION AXIS IS NOT OUT OF THE QUESTION AS FAR NORTH AS
METRO DETROIT. MODEL CROSS SECTIONS INDICATE IMPRESSIVE CONVECTIVE
INSTABILITY IN THE 700-500 MB LAYER MATCHING UP WELL WITH THE
OBSERVED BAND FILLING IN OVER THE SOUTH HALF OF SE MICHIGAN. THIS,
ALONG WITH SPECIFIC HUMIDITY OF 3-4 G/KG WILL MAKE MAXIMUM USE OF A
DEEP WEDGE OF FRONTOGENESIS EXCEEDING 100 UNITS. SIMILAR DEPICTION
IN THE LATEST RAP OUTPUT INDICATES THE BURST OF HEAVY SNOWFALL RATES
FROM HIGHER ALTITUDE AND WITH HIGHER SNOW RATIO PERSISTING THROUGH
CENTRAL SECTIONS OF THE REGION WITH A PIVOT OCCURRING IN THE 12-15Z
TIME PERIOD BEFORE MIGRATING SOUTHWARD AND EASTWARD DURING THE LATE
MORNING. THIS IS THE SUSPECTED SOURCE OF OVERACHIEVEMENT IN
SNOWFALL TOTALS ON THE NORTHERN FRINGES OF THE WARNING AREA. FARTHER
SOUTH, THE GOING 6 TO 9 INCH FORECAST LOOKS SOLID AS THE MID LEVEL
FRONTAL ZONE AND DEFORMATION ZONE FILL IN TO FORM ONE SOLID NW FLANK
OF THE SYSTEM WITH 1-2 INCH PER HOUR PEAK RATES FOR LONGER DURATION
THAN POINTS NORTH.
THE SYSTEM WILL EXIT THE AREA BY MID AFTERNOON WITH TRAILING
NORTHERLY FLOW CARRYING IN ANOTHER ROUND OF ARCTIC AIR. DEPENDING ON
THE CLEARING TREND, BELOW ZERO MIN TEMPS ARE ON TARGET WITH FRESH
SNOW COVER BY SUNRISE THURSDAY.
&&
.LONG TERM...THURSDAY THROUGH TUESDAY
A QUICK LOOK AT THE LONGWAVE PATTERN THROUGH THE NEXT WEEK SHOW
SPLIT FLOW OVER THE WEST COAST WITH THE TROUGH STILL HOLDING ON OVER
THE EASTERN CONUS. THE JET STREAM IS VERY ACTIVE/ENERGETIC...BOTH
NORTHERN AND SOUTHERN STREAMS...BUT AT THIS POINT IT LOOKS LIKE THE
MAJORITY OF THE PRECIP WILL TRY TO STEER CLEAR OF SOUTHERN MI. THE
GOOD NEWS IS THAT WE ARE STILL GETTING SURGES OF SOUTHERLY FLOW
EVERY THIRD DAY OR SO...BUT THE BAD NEWS IS THAT THESE WARM UPS INTO
THE LOW 40S ARE STRUGGLING TO REACH MID MARCH AVERAGE HIGH TEMPS
WHICH ARE IN THE MID 40S. TO SUM IT UP...THE MARCH
ROLLER COASTER/WAVE TRAIN WILL CONTINUE FOR THE FORESEEABLE FUTURE.
WILL NOW HIT ON A FEW FEATURES OF NOTE IN THE EXTENDED PERIOD.
THURSDAY WILL BE A COLD DAY AS THE MID/UPPER LEVEL ARCTIC TROUGH
REMAINS IN CONTROL WITH NORTHERN EXTENSION OF A HIGH PRESSURE SYSTEM
AT THE SURFACE THAT SLIDE SOUTH BEHIND WEDNESDAYS BIG SYSTEM.
NORTHERLY WINDS WILL BACK TO WESTERLY AS HEIGHTS BUILD THROUGH THE
DAY BUT WE STILL ONLY GET TO 542DAM AT 500MB BY THURSDAY EVENING SO
WE WILL NOT REALIZE THAT INCREASE AT THE SFC DURING DAYLIGHT HOURS.
FRIDAY WE FIND OURSELVES IN BETWEEN THE EXITING HIGH AND A CLIPPER
TRACKING EASTWARD OVER NORTHERN LAKE SUPERIOR. SW TO NE PRESSURE
GRADIENT WILL SET UP GOOD SW FLOW AND WAA. LL JET AT 850MB WILL PEAK
AROUND 45 KNOTS DURING THE AFTERNOON ALTHOUGH WE ONLY LOOK TO MIX UP
TO AROUND 900MB. SHOULD STILL BE FAIRLY BREEZY OUT IN THE AFTERNOON
WITH GUSTS REACHING 20-30 MPH. HIGHS SHOULD REACH INTO THE 40S ONCE
AGAIN. THERE IS A SLIGHT CHANCE THAT A FEW RAIN/SNOW SHOWERS COULD
POP UP LATE FRIDAY OR OVERNIGHT BUT THERE IS NOT MUCH MOISTURE IN
THE COLUMN TO WORK WITH SO WILL CONTINUE TO LEAN TOWARD A DRY
FORECAST. THIS CLIPPER WILL PULL A PAIR OF COLD FRONTS THROUGH THE
REGION WHICH WILL CAUSE TEMPS TO DROP BOTH SATURDAY AND SUNDAY AS
COLDER AND COLDER AIR WORKS INTO THE AREA. SAME HOLDS TRUE FOR
SAT/SUN THAT MODELS ARE TRYING TO POP A FEW SHOWERS BUT DOMINATE
AREA OF HIGH PRESSURE BUILDING IN FROM CANADA WILL CONTINUE TO KEEP
VERY DRY AIR IN PLACE MAKING IT HARD FOR ANYTHING TO DEVELOP. EARLY
NEXT WEEK IT LOOKS LIKE THE NORTHERN AND SOUTHERN STREAMS OF THE
JETS WILL PHASE AGAIN PRODUCING ANOTHER STRONG LOW PRESSURE SYSTEM.
ALL INDICATIONS AT THIS POINT ARE THAT THE STORM WILL DEVELOP MUCH
FURTHER SOUTH AND EAST OF MI.
&&
.MARINE...
A STRONG LOW PRESSURE SYSTEM WILL DEEPEN AS IT TRACKS ALONG THE OHIO
RIVER THROUGH THIS AFTERNOON. THE TRACK OF THE STORM PLACES THE
EASTERN GREAT LAKES IN THE TIGHT NORTHEAST TO SOUTHWEST PRESSURE
GRADIENT FIELD WHICH WILL RESULT IN GALE FORCE WINDS TODAY. GALE
WARNINGS ARE IN EFFECT FOR LAKE HURON...LAKE ERIE AND LAKE ST CLAIR
THROUGH THIS EVENING. SEE CURRENT MARINE HEADLINES FOR THE LATEST
INFORMATION. A HIGH PRESSURE SYSTEM WILL THEN DROP THROUGH THE
GREAT LAKES FROM CANADA ALLOWING THE WINDS TO SUBSIDE. YET ANOTHER
LOW PRESSURE SYSTEM WILL MOVE ACROSS NORTHERN LAKE SUPERIOR ON
FRIDAY BRING A RETURN OF MODERATE SOUTHWEST FLOW AND MILDER AIR.
&&
.AVIATION...ISSUED 1159 PM EDT TUE MAR 11 2014
//DISCUSSION...
CONDITIONS ARE SLOWLY GOING DOWN TO MVFR AS THE FIRST BATCH OF LIGHT
RAIN EXITS THE REGION. CONDITIONS WILL CONTINUE TO DETERIORATE WITH
THE ONSET OF STEADIER SNOW AFTER MIDNIGHT WITH HEAVY SNOWFALL RATES
LIKELY TO BRING IFR TO LIFR CONDITIONS TO KPTK AND POINTS SOUTH
BETWEEN ROUGHLY 09Z AND 15Z. NORTHERLY WINDS WILL GUST TO 30 KNOTS
OR HIGHER DURING THE DAY ON WEDNESDAY WHICH WILL ADD THE
COMPLICATING FACTOR OF BLOWING SNOW WHICH MAY CONTINUE TO IMPEDE
VISIBILITY EVEN AS SNOW WINDS DOWN MIDDAY WEDNESDAY.
FOR DTW...RAPIDLY DETERIORATING CONDITIONS CAN THEN BE EXPECTED WITH
VISIBILITIES FALLING TO 1/4 MILE OR LESS BETWEEN 09Z AND 15Z. ONCE
STEADY SNOW BEGINS AFTER MIDNIGHT...PTYPE WILL REMAIN ALL SNOW
THROUGH THE EVENT. ACCUMULATIONS OF 6 TO 8 INCHES CAN BE
EXPECTED...THE BULK OF WHICH WILL ACCUMULATE DURING THE
AFOREMENTIONED PEAK PERIOD. THE PREDOMINANTLY NORTHERLY WIND
DIRECTION IS EXPECTED TO LIMIT CROSSWIND CONCERNS.
//DTW THRESHOLD THREATS...
* HIGH CONFIDENCE ON CEILING BELOW 5000 FEET TONIGHT AND WEDNESDAY.
* HIGH CONFIDENCE IN PTYPE OF SNOW AFTER 08Z
&&
.DTX WATCHES/WARNINGS/ADVISORIES...
MI...WINTER STORM WARNING...MIZ060-MIZ061-MIZ062-MIZ063-MIZ068-MIZ069-
MIZ070-MIZ075-MIZ076-MIZ082-MIZ083...UNTIL 3 PM WEDNESDAY.
WINTER WEATHER ADVISORY...MIZ053-MIZ054-MIZ055...UNTIL 3 PM
WEDNESDAY.
WIND ADVISORY...MIZ049-MIZ055...FROM 8 AM WEDNESDAY TO 6 PM
WEDNESDAY.
LAKE HURON...
GALE WARNING...LHZ363-LHZ421-LHZ422-LHZ441-LHZ442-LHZ443-LHZ462-
LHZ463-LHZ464...UNTIL 8 PM WEDNESDAY.
LAKE ST CLAIR...
GALE WARNING...FROM 8 AM WEDNESDAY TO 8 PM WEDNESDAY.
MI WATERS OF LAKE ERIE...
GALE WARNING...FROM 8 AM WEDNESDAY TO 8 PM WEDNESDAY.
&&
$$
SHORT TERM...BT
LONG TERM....DRK
MARINE.......DRK
AVIATION.....KURIMSKI
YOU CAN OBTAIN YOUR LATEST NATIONAL WEATHER SERVICE FORECASTS ONLINE
AT WWW.WEATHER.GOV/DETROIT (ALL LOWER CASE).
AREA FORECAST DISCUSSION
NWS RALEIGH NC
145 PM EDT WED MAR 12 2014
.SYNOPSIS...A DEEPENING AREA OF LOW PRESSURE OVER THE OHIO VALLEY
WILL TRACK EAST-NORTHEASTWARD THROUGH THE MIDDLE ATLANTIC STATES
TODAY...WITH ATTENDANT TRAILING COLD FRONT CROSSING CENTRAL NC THIS
EVENING. HIGH PRESSURE WILL BUILD INTO THE AREA FOR THE REMAINDER OF
THE WEEK.
&&
.NEAR TERM /THROUGH TONIGHT/...
AS OF 1030 AM WEDNESDAY...
...A WIND ADVISORY IS IN EFFECT FOR ALL OF CENTRAL NC FOR LATE THIS
AFTERNOON THROUGH MIDNIGHT ...
THINKING HAS NOT CHANGED MUCH REGARDING CONVECTIVE EVOLUTION AND
STRONG WINDS THIS AFTERNOON AND EVENING. LIGHT PRECIP ASSOCIATED
WITH A WEAKENING SOUTHERN STREAM WAVE LIGHTING ACROSS THE AREA IS
MOVING OFF TO THE NORTHEAST AND WILL FOR THE MOST PART BE OUT OF THE
CWA BY JUST AFTER NOON...LEAVING A PERIOD OF NO PRECIP AND POTENTIAL
FOR SOME CLEARING/ADDITIONAL HEATING. REGIONAL VIS IMAGERY SHOWS
WIDESPREAD CLOUD COVER UPSTREAM...THE WINDOW FOR BREAKS IN CLOUDS IS
SHORT BEFORE THE STRONG COLD FRONT SWEEPS ACROSS THE AREA BETWEEN
ROUGHLY 4PM AND 11PM. STRONG SOUTHWESTERLY PREFRONTAL WINDS AND 850MB
TEMPS OF 10-12C SUPPORT HIGHS IN THE LOWER 70S WEST AND UPPER 70S
EAST ONCE PRECIP MOVES OUT OF THE AREA. HAVE MADE SOME MINOR
ADJUSTMENTS ACROSS THE NORTH AND NORTHWEST WHERE HEATING WILL BE
SHORTEST.
THE BIGGEST QUESTION REGARDING CONVECTION ALONG THE COLD FRONT IS
DESTABILIZATION...WHICH APPEARS WILL BE SHALLOW AND CONFINED TO
IMMEDIATELY ALONG AND AHEAD OF THE FRONT. THE LATEST RAP SHOWS
MAYBE 200-400 J/KG OF SBCAPE AT BEST FROM CHARLOTTE TO ROXBORO AND
DWINDLING WITH EASTWARD EXTENT. UNIDIRECTIONAL EFFECTIVE SHEAR
WOULD SUPPORT A BROKEN LINE OF SHOWERS AND LOW-TOPPED STORMS...WITH
BETTER COVERAGE CLOSER TO THE VIRGINIA BORDER WHERE FORCING AND
MOISTURE ARE A LITTLE DEEPER.
THE BIGGEST CONCERN TODAY WILL BE WINDS AHEAD OF AND BEHIND THE
FRONT. INCREASED MIXING THIS AFTERNOON MAY ALLOW SOME OF THE 35-
40KT WIND BETWEEN 925MB AND 850MB TO REACH THE SURFACE...ESPECIALLY
WITHIN SHOWERS/STORMS ALONG THE FRONT. THE STRONGEST WINDS WILL
COME BEHIND THE FRONT WITH 10-12MB PRESSURE RISES (6HR) ASSOCIATED
WITH THE DEEPENING 980MB LOW OVER THE MID-ATLANTIC. THERE IS SOME
INHERENT UNCERTAINTY REGARDING NOCTURNAL STABILIZATION LIMITING
WINDS...BUT THE STRENGTHENING PRESSURE GRADIENT AND SUBSIDENCE
SHOULD AID IN GETTING 40-45KT DOWN TO THE SURFACE IN WHAT WILL BE A
MOSTLY WELL-MIXED BOUNDARY LAYER. THUS THE WIND ADVISORY APPEARS TO
BE WELL TIMED.
LOWS TONIGHT WILL RANGE FROM THE MID-UPPER 20 NW TO LOWER-MID 30S
SE.
&&
.SHORT TERM /THURSDAY THROUGH FRIDAY NIGHT/...
AS OF 300 AM WEDNESDAY...
AFTER SEVERAL DAYS OF SPRING-LIKE TEMPS...DEEP UPPER TROUGHING OVER
THE EAST COAST ON THURSDAY WILL LEAD TO AN ABRUPT CHANGE BACK TO
WINTER-LIKE TEMPS...AS HIGHS WILL ONLY BE IN THE 40S...A GOOD 15-20
DEGREES BELOW NORMAL. IN ADDITION...A STRONG GRADIENT BETWEEN THE
DEPARTING SURFACE LOW AND THE HIGH BUILDING IN WILL RESULT IN BREEZY
CONDITIONS...MAKING IT FEEL EVEN COLDER. THESE BREEZY WINDS...IN
ADDITION TO DEWPOINTS IN THE SINGLE DIGITS RESULTING IN RELATIVE
HUMIDITY VALUES IN THE TEENS...MAY CAUSE SOME FIRE WEATHER CONCERNS.
CONTINUED COORDINATION WILL TAKE PLACE WITH THE FOREST SERVICE LATER
THIS MORNING REGARDING THE NEED FOR ANY STATEMENTS. WINDS WILL RELAX
THURSDAY NIGHT AS HIGH PRESSURE MOVES OVERHEAD AND WITH CLEAR
SKIES...OVERNIGHT LOWS WILL FALL INTO THE MID 20S.
THESE WELL BELOW NORMAL TEMPS WILL BE SHORT LIVED THOUGH AS WEAK
SHORTWAVE RIDGING BUILDS EAST OVER THE AREA AND THE SURFACE HIGH
SLIPS OFFSHORE (SETTING UP RETURN FLOW) ON FRIDAY. ALL OF THIS WILL
RESULT IN TEMPS MODERATING INTO THE MID/UPPER 50S...WITH OVERNIGHT
LOWS IN THE UPPER 30S TO LOWER 40S.
&&
.LONG TERM /SATURDAY THROUGH TUESDAY/...
AS OF 300 AM WEDNESDAY...
A NORTHERN STREAM SHORT WAVE TROUGH WILL MOVE ACROSS THE GREAT LAKES
AND INTO THE NEW ENGLAND AREA SATURDAY INTO SUNDAY...PROPELLING A
COLD FRONT THROUGH OUR AREA LATE SATURDAY NIGHT INTO EARLY SUNDAY
MORNING. HOWEVER...THERE CONTINUES TO BE DISAGREEMENT AMONG THE
MODELS ON OUR PRECIP CHANCES. THE GFS CONTINUES TO BE THE WETTER
MODEL AS IT SHOWS SOME SOUTHERN STREAM ENERGY ALSO TRANSLATING EAST
DURING THIS TIME FRAME. THE ECMWF STILL IS VIRTUALLY DRY AS THE
SOUTHERN STREAM ENERGY DOES NOT KICK EAST AS FAST. WILL MAINTAIN THE
CURRENT FORECAST THINKING UNTIL MODELS COME INTO BETTER AGREEMENT.
THEREFORE...WILL HOLD PRECIP CHANCES DOWN...WITH ONLY AN INCREASE IN
CLOUD COVER. CONTINUED LOW LEVEL SOUTHERLY FLOW WILL RESULT IN MORE
AIR MASS MODIFICATION...WITH HIGHS EXPECTED TO RISE INTO THE MID 60S
ON SATURDAY. BRIEF NORTHERLY WINDS BEHIND THE FRONT EARLY ON SUNDAY
SHOULD RESULT IN SLIGHTLY LOWER TEMPS...GENERALLY MORE IN THE WAY OF
UPPER 50S TO LOWER 60S.
CONFIDENCE DECREASES EVEN FURTHER FOR VERY END OF THE WEEKEND AND
INTO EARLY NEXT WEEK...BUT THE GENERAL CONSENSUS IS THAT ANOTHER
NORTHERN STREAM TROUGH WILL DIG INTO THE SOUTHEAST...WITH YET
ANOTHER COASTAL LOW IMPACTING THE REGION AS SOUTHERN STREAM ENERGY
MOVES EAST. GIVEN THE HANDLING OF THE SOUTHERN STREAM ENERGY EARLIER
IN THE WEEKEND (SEE ABOVE PARAGRAPH)...IT IS NOT SURPRISING THAT
THERE CONTINUES TO BE LARGE MODEL SPREAD. THE GFS IS NOT AS DEEP
WITH THE NORTHERN STREAM TROUGH AND IS STILL INDICATING MUCH LESS
PRECIP FOR CENTRAL NC SUNDAY INTO MONDAY. THE ECMWF SHOWS THE
SOUTHERN STREAM ENERGY FINALLY KICKING EAST AND INDICATES A DEEPER
TROUGH DIGGING ACROSS THE SOUTHEAST. THE RESULTANT SURFACE LOW
TRACKS ACROSS THE SOUTHEAST AND EVENTUALLY OFF THE CAROLINA COAST
LATE SUNDAY INTO MONDAY. WILL LEAN MORE TOWARDS THE ECMWF AS IT HAS
BEEN THE MORE CONSISTENT MODEL (PER WPC) AND THEREFORE WILL SHOW
INCREASING PRECIP CHANCES SUNDAY...WITH HIGHEST POPS CENTERED ON THE
SUNDAY NIGHT/MONDAY TIME FRAME. THERE IS STILL A LOT TO BE IRONED
OUT...GIVEN THIS IS DAYS 5/6...BUT IF THE ECMWF VERIFIES...IT COULD
BE ANOTHER GOOD RAIN EVENT FOR CENTRAL NC. IN ADDITION...THERE WOULD
BE A POSSIBILITY OF SOME WINTRY PRECIP (MOST LIKELY A CHANGEOVER TO
SNOW AT THE TAIL END)...BUT GIVEN THE TIME OF YEAR AND THE NOT SO
FAVORABLE POSITION/STRENGTH OF THE HIGH...WILL MAINTAIN AN ALL
LIQUID FORECAST FOR NOW. TEMPS WILL BE NEAR NORMAL FOR MOST OF THE
WEEKEND BEFORE FALLING BACK TO BELOW NORMAL EARLY NEXT WEEK.
&&
.AVIATION /18Z WEDNESDAY THROUGH MONDAY/...
AS OF 145 PM WEDNESDAY...
IFR CEILINGS AT KGSO/KINT AND MVFR ELSEWHERE WILL SCATTER OUT THIS
AFTERNOON BEFORE A VERY STRONG COLD FRONT SWEEPS ACROSS THE AREA
BETWEEN 21Z AND 03Z. AHEAD OF THE FRONT..WINDS ARE FROM THE
SOUTHWEST IN THE 15-20KT RANGE...GUSTING TO NEAR 30KT FROM KFAY TO
KRWI. A LINE OF SHOWERS AND STORMS WILL ACCOMPANY THE COLD
FRONT...WITH A STRONG WIND SHIFT TO NORTHWESTERLY AND THE POTENTIAL
FOR GUSTS TO AROUND 40KT. THIS WILL CREATE A STRONG CROSSWIND FOR
AT MOST TERMINALS FOR SEVERAL HOURS THIS EVENING AND OVERNIGHT.
STRONG NORTHWESTERLY WINDS WILL CONTINUE ON THURSDAY...THOUGH
WEAKENING FROM WEST TO EAST DURING THE AFTERNOON. VFR CONDITIONS
WILL PREVAIL.
LOOKING AHEAD: EXPECT PREDOMINATELY VFR CONDITIONS THROUGH SATURDAY.
THERE IS A SMALL CHANCE OF LOW LEVEL WIND SHEAR LATER FRIDAY NIGHT.
THE NEXT STORM COULD IMPACT THE AREA AS EARLY AS SUNDAY AND INTO
EARLY NEXT WEEK.
&&
.RAH WATCHES/WARNINGS/ADVISORIES...
WIND ADVISORY FROM 3 PM THIS AFTERNOON TO MIDNIGHT EDT TONIGHT FOR
NCZ007>011-021>028-038>043-073>078-083>086-088-089..
&&
$$
SYNOPSIS...MWS
NEAR TERM...CBL/SMITH
SHORT TERM...KRD
LONG TERM...KRD
AVIATION...SMITH
AREA FORECAST DISCUSSION
NWS RALEIGH NC
1030 AM EDT WED MAR 12 2014
.SYNOPSIS...A DEEPENING AREA OF LOW PRESSURE OVER THE OHIO VALLEY
WILL TRACK EAST-NORTHEASTWARD THROUGH THE MIDDLE ATLANTIC STATES
TODAY...WITH ATTENDANT TRAILING COLD FRONT CROSSING CENTRAL NC THIS
EVENING. HIGH PRESSURE WILL BUILD INTO THE AREA FOR THE REMAINDER OF
THE WEEK.
&&
.NEAR TERM /THROUGH TONIGHT/...
AS OF 1030 AM WEDNESDAY...
...A WIND ADVISORY IS IN EFFECT FOR ALL OF CENTRAL NC FOR LATE THIS
AFTERNOON THROUGH MIDNIGHT ...
THINKING HAS NOT CHANGED MUCH REGARDING CONVECTIVE EVOLUTION AND
STRONG WINDS THIS AFTERNOON AND EVENING. LIGHT PRECIP ASSOCIATED
WITH A WEAKENING SOUTHERN STREAM WAVE LIGHTING ACROSS THE AREA IS
MOVING OFF TO THE NORTHEAST AND WILL FOR THE MOST PART BE OUT OF THE
CWA BY JUST AFTER NOON...LEAVING A PERIOD OF NO PRECIP AND POTENTIAL
FOR SOME CLEARING/ADDITIONAL HEATING. REGIONAL VIS IMAGERY SHOWS
WIDESPREAD CLOUD COVER UPSTREAM...THE WINDOW FOR BREAKS IN CLOUDS IS
SHORT BEFORE THE STRONG COLD FRONT SWEEPS ACROSS THE AREA BETWEEN
ROUGHLY 4PM AND 11PM. STRONG SOUTHWESTERLY PREFRONTAL WINDS AND 850MB
TEMPS OF 10-12C SUPPORT HIGHS IN THE LOWER 70S WEST AND UPPER 70S
EAST ONCE PRECIP MOVES OUT OF THE AREA. HAVE MADE SOME MINOR
ADJUSTMENTS ACROSS THE NORTH AND NORTHWEST WHERE HEATING WILL BE
SHORTEST.
THE BIGGEST QUESTION REGARDING CONVECTION ALONG THE COLD FRONT IS
DESTABILIZATION...WHICH APPEARS WILL BE SHALLOW AND CONFINED TO
IMMEDIATELY ALONG AND AHEAD OF THE FRONT. THE LATEST RAP SHOWS
MAYBE 200-400 J/KG OF SBCAPE AT BEST FROM CHARLOTTE TO ROXBORO AND
DWINDLING WITH EASTWARD EXTENT. UNIDIRECTIONAL EFFECTIVE SHEAR
WOULD SUPPORT A BROKEN LINE OF SHOWERS AND LOW-TOPPED STORMS...WITH
BETTER COVERAGE CLOSER TO THE VIRGINIA BORDER WHERE FORCING AND
MOISTURE ARE A LITTLE DEEPER.
THE BIGGEST CONCERN TODAY WILL BE WINDS AHEAD OF AND BEHIND THE
FRONT. INCREASED MIXING THIS AFTERNOON MAY ALLOW SOME OF THE 35-
40KT WIND BETWEEN 925MB AND 850MB TO REACH THE SURFACE...ESPECIALLY
WITHIN SHOWERS/STORMS ALONG THE FRONT. THE STRONGEST WINDS WILL
COME BEHIND THE FRONT WITH 10-12MB PRESSURE RISES (6HR) ASSOCIATED
WITH THE DEEPENING 980MB LOW OVER THE MID-ATLANTIC. THERE IS SOME
INHERENT UNCERTAINTY REGARDING NOCTURNAL STABILIZATION LIMITING
WINDS...BUT THE STRENGTHENING PRESSURE GRADIENT AND SUBSIDENCE
SHOULD AID IN GETTING 40-45KT DOWN TO THE SURFACE IN WHAT WILL BE A
MOSTLY WELL-MIXED BOUNDARY LAYER. THUS THE WIND ADVISORY APPEARS TO
BE WELL TIMED.
LOWS TONIGHT WILL RANGE FROM THE MID-UPPER 20 NW TO LOWER-MID 30S
SE.
&&
.SHORT TERM /THURSDAY THROUGH FRIDAY NIGHT/...
AS OF 300 AM WEDNESDAY...
AFTER SEVERAL DAYS OF SPRING-LIKE TEMPS...DEEP UPPER TROUGHING OVER
THE EAST COAST ON THURSDAY WILL LEAD TO AN ABRUPT CHANGE BACK TO
WINTER-LIKE TEMPS...AS HIGHS WILL ONLY BE IN THE 40S...A GOOD 15-20
DEGREES BELOW NORMAL. IN ADDITION...A STRONG GRADIENT BETWEEN THE
DEPARTING SURFACE LOW AND THE HIGH BUILDING IN WILL RESULT IN BREEZY
CONDITIONS...MAKING IT FEEL EVEN COLDER. THESE BREEZY WINDS...IN
ADDITION TO DEWPOINTS IN THE SINGLE DIGITS RESULTING IN RELATIVE
HUMIDITY VALUES IN THE TEENS...MAY CAUSE SOME FIRE WEATHER CONCERNS.
CONTINUED COORDINATION WILL TAKE PLACE WITH THE FOREST SERVICE LATER
THIS MORNING REGARDING THE NEED FOR ANY STATEMENTS. WINDS WILL RELAX
THURSDAY NIGHT AS HIGH PRESSURE MOVES OVERHEAD AND WITH CLEAR
SKIES...OVERNIGHT LOWS WILL FALL INTO THE MID 20S.
THESE WELL BELOW NORMAL TEMPS WILL BE SHORT LIVED THOUGH AS WEAK
SHORTWAVE RIDGING BUILDS EAST OVER THE AREA AND THE SURFACE HIGH
SLIPS OFFSHORE (SETTING UP RETURN FLOW) ON FRIDAY. ALL OF THIS WILL
RESULT IN TEMPS MODERATING INTO THE MID/UPPER 50S...WITH OVERNIGHT
LOWS IN THE UPPER 30S TO LOWER 40S.
&&
.LONG TERM /SATURDAY THROUGH TUESDAY/...
AS OF 300 AM WEDNESDAY...
A NORTHERN STREAM SHORT WAVE TROUGH WILL MOVE ACROSS THE GREAT LAKES
AND INTO THE NEW ENGLAND AREA SATURDAY INTO SUNDAY...PROPELLING A
COLD FRONT THROUGH OUR AREA LATE SATURDAY NIGHT INTO EARLY SUNDAY
MORNING. HOWEVER...THERE CONTINUES TO BE DISAGREEMENT AMONG THE
MODELS ON OUR PRECIP CHANCES. THE GFS CONTINUES TO BE THE WETTER
MODEL AS IT SHOWS SOME SOUTHERN STREAM ENERGY ALSO TRANSLATING EAST
DURING THIS TIME FRAME. THE ECMWF STILL IS VIRTUALLY DRY AS THE
SOUTHERN STREAM ENERGY DOES NOT KICK EAST AS FAST. WILL MAINTAIN THE
CURRENT FORECAST THINKING UNTIL MODELS COME INTO BETTER AGREEMENT.
THEREFORE...WILL HOLD PRECIP CHANCES DOWN...WITH ONLY AN INCREASE IN
CLOUD COVER. CONTINUED LOW LEVEL SOUTHERLY FLOW WILL RESULT IN MORE
AIR MASS MODIFICATION...WITH HIGHS EXPECTED TO RISE INTO THE MID 60S
ON SATURDAY. BRIEF NORTHERLY WINDS BEHIND THE FRONT EARLY ON SUNDAY
SHOULD RESULT IN SLIGHTLY LOWER TEMPS...GENERALLY MORE IN THE WAY OF
UPPER 50S TO LOWER 60S.
CONFIDENCE DECREASES EVEN FURTHER FOR VERY END OF THE WEEKEND AND
INTO EARLY NEXT WEEK...BUT THE GENERAL CONSENSUS IS THAT ANOTHER
NORTHERN STREAM TROUGH WILL DIG INTO THE SOUTHEAST...WITH YET
ANOTHER COASTAL LOW IMPACTING THE REGION AS SOUTHERN STREAM ENERGY
MOVES EAST. GIVEN THE HANDLING OF THE SOUTHERN STREAM ENERGY EARLIER
IN THE WEEKEND (SEE ABOVE PARAGRAPH)...IT IS NOT SURPRISING THAT
THERE CONTINUES TO BE LARGE MODEL SPREAD. THE GFS IS NOT AS DEEP
WITH THE NORTHERN STREAM TROUGH AND IS STILL INDICATING MUCH LESS
PRECIP FOR CENTRAL NC SUNDAY INTO MONDAY. THE ECMWF SHOWS THE
SOUTHERN STREAM ENERGY FINALLY KICKING EAST AND INDICATES A DEEPER
TROUGH DIGGING ACROSS THE SOUTHEAST. THE RESULTANT SURFACE LOW
TRACKS ACROSS THE SOUTHEAST AND EVENTUALLY OFF THE CAROLINA COAST
LATE SUNDAY INTO MONDAY. WILL LEAN MORE TOWARDS THE ECMWF AS IT HAS
BEEN THE MORE CONSISTENT MODEL (PER WPC) AND THEREFORE WILL SHOW
INCREASING PRECIP CHANCES SUNDAY...WITH HIGHEST POPS CENTERED ON THE
SUNDAY NIGHT/MONDAY TIME FRAME. THERE IS STILL A LOT TO BE IRONED
OUT...GIVEN THIS IS DAYS 5/6...BUT IF THE ECMWF VERIFIES...IT COULD
BE ANOTHER GOOD RAIN EVENT FOR CENTRAL NC. IN ADDITION...THERE WOULD
BE A POSSIBILITY OF SOME WINTRY PRECIP (MOST LIKELY A CHANGEOVER TO
SNOW AT THE TAIL END)...BUT GIVEN THE TIME OF YEAR AND THE NOT SO
FAVORABLE POSITION/STRENGTH OF THE HIGH...WILL MAINTAIN AN ALL
LIQUID FORECAST FOR NOW. TEMPS WILL BE NEAR NORMAL FOR MOST OF THE
WEEKEND BEFORE FALLING BACK TO BELOW NORMAL EARLY NEXT WEEK.
&&
.AVIATION /12Z WEDNESDAY THROUGH SUNDAY/...
AS OF 735 AM WEDNESDAY...
24-HR TAF PERIOD:
A QUICK MOVING SOUTHERN STREAM WAVE WILL TRAVERSE THE GULF COAST
OVERNIGHT AND WILL MOVE OFF THE SOUTHEAST COAST THIS MORNING.
MEANWHILE ACROSS THE CENTRAL US... AN INTENSIFYING LOW PRESSURE
SYSTEM WILL TRACK FROM THE OH VALLEY ENE INTO THE MID-ATLANTIC
REGION TODAY. MOISTURE WILL RAPIDLY SPREAD NEWD INTO THE AREA THIS
MORNING IN ASSOC/W STRENGTHENING 35-40KT LLJ...WITH SCATTERED
SHOWERS OVERSPREADING THE BETWEEN 12-15Z. COULD SEE A BRIEF PERIOD
OF MVFR CEILINGS...BUT CEILINGS SHOULD REMAIN MOSTLY VFR.
BY THE AFTERNOON AS THE BOUNDARY/MIXED LAYER DEEPENS AND GRADIENT
INCREASES AS THE INTENSIFYING LOW MOVES INTO THE VIRGINIAS... STRONG
SOUTHWESTERLY SURFACE WINDS WILL DEVELOPE...GUSTING TO 35 TO 40 MPH
AT TIME. A STRONG COLD FRONT WILL SWEEP EASTWARD ACROSS CENTRAL NC
BETWEEN 21Z-03Z. A BROKEN LINE OF SHOWERS...AND ISOLATED LOW-TOPPED
THUNDERSTORMS WITH WIND GUSTS IN EXCESS OF 40KTS...WILL LIKELY
ACCOMPANY THE COLD FRONT...FOLLOWED BY 35-40KTS OF POST-FRONTAL
NORTHWESTERLY WINDS....WHICH COULD RESULT IN CROSSWIND IMPACTS FOR
TERMINALS.
LOOKING AHEAD: EXPECT PREDOMINATELY VFR CONDITIONS THROUGH SATURDAY.
THE NEXT STORM COULD IMPACT THE AREA AS EARLY AS SUNDAY AND INTO
EARLY NEXT WEEK.
&&
.RAH WATCHES/WARNINGS/ADVISORIES...
WIND ADVISORY FROM 3 PM THIS AFTERNOON TO MIDNIGHT EDT TONIGHT FOR
NCZ007>011-021>028-038>043-073>078-083>086-088-089..
&&
$$
SYNOPSIS...MWS
NEAR TERM...CBL/SMITH
SHORT TERM...KRD
LONG TERM...KRD
AVIATION...CBL
AREA FORECAST DISCUSSION
NWS BISMARCK ND
1157 PM CDT TUE MAR 11 2014
.UPDATE...
ISSUED AT 1157 PM CDT TUE MAR 11 2014
LATEST SURFACE MAP SHOWS A BACKDOOR COLD FRONT STRETCHED FROM
SOUTHEAST SASKATCHEWAN SOUTHEAST INTO WESTHOPE...DRAKE...AND
ELLENDALE. COLDER AIR TO THE EAST OF THIS FRONT WITH ISOLATED
SNOWSHOWERS IN THE NORTHERN PORTION OF THE JAMES RIVER VALLEY WILL
WANE OVERNIGHT AS VERTICAL MOTION ENDS AND SHIFT EAST. PATCHY FOG
POSSIBLE ALONG/NEAR THE FRONTAL BOUNDARY OVERNIGHT SO WILL KEEP
SOME MENTION OF THIS IN THE FORECAST. LATEST FOG/STRATUS LOOP
OUTLINES THE SURFACE COLD FRONT WELL WITH OVERCAST CONDITIONS
ALONG AND EAST OF THE FRONT. WITH NORTHWEST UPPER FLOW PARALLELING
THE SURFACE COLD FRONT...THE FRONT WILL STALL OUT OVERNIGHT IN ITS
CURRENT POSITION AND THEN BEGIN TO MOVE EAST WEDNESDAY IN THE FORM
OF A WARM FRONT. VERTICAL MOTION INDUCED WITH WARM AIR ADVECTION
IN THE 850MB TO 700MB LAYER PER TIME HEIGHT CROSS SECTIONS WILL BE
FAVORABLE FOR SCT TO BKN CLOUDS WEDNESDAY...BUT DRY CONDITIONS
PREVAIL. THE MAIN FORECAST ELEMENTS HARE IN GOOD SHAPE WITH LITTLE
OR NO UPDATES PLANNED AT THIS TIME.
UPDATE ISSUED AT 1014 PM CDT TUE MAR 11 2014
ONLY A FEW MINOR UPDATES TO THE LATE EVENING FORECAST. AREA OF LOW
VFR-MVFR CLOUDS CONTINUES TO DROP SOUTHEAST FROM CANADA INTO THE
SOURIS RIVER VALLEY AND DEVILS LAKE BASIN. THIS IS FORECAST TO
DROP SOUTHEAST INTO THE JAMES RIVER VALLEY LATE TONIGHT. A FEW
WANING SHOWERS IN THE FAR SOUTH CENTRAL OTHERWISE MOSTLY CLEAR
ALONG AND WEST OF THE HIGHWAY 83 CORRIDOR. WITH THE LATE EVENING
UPDATED WE TRIMMED THE WESTERN EXTENT OF SNOW DROPPING SOUTH FROM
CANADA...KEEPING IT CONFINED TO ONLY EASTERN PORTIONS OF CENTRAL
NORTH DAKOTA. WILL HAVE TO KEEP AN EYE ON TEMPERATURES IN THE WEST
AS SKIES HAVE CLEARED...BUT DEW POINT TEMPERATURES REMAIN IN THE
MID 20S. LOWERED MINS IN THE FAR SOUTHWEST A COUPLE DEGREES.
UPDATE ISSUED AT 727 PM CDT TUE MAR 11 2014
A WEAK INVERTED TROUGH REMAINS OVER CENTRAL NORTH DAKOTA WITH HIGH
PRESSURE SITUATED TO THE WEST AND EAST OF THE TROUGH. ISOLATED
DIURNAL CONVECTION OVER THE WEST CENTRAL AND SOUTHWEST WILL
CONTINUE TO DIMINISH EARLY THIS EVENING. DID EXTEND ISOLATED
SHOWERS INTO THE EARLY EVENING HOURS. TO THE EAST...VERY LIGHT
REFLECTIVITIES IN SOUTHWEST MANITOBA WILL MOVE INTO THE FAR
NORTHEAST CWA WITHING THE NEXT HOUR. OTHERWISE LITTLE IN THE WAY
OF PRECIPITATION NOTED. WILL TREND LOWER ON POPS THIS EVENING OVER
THE NORTHEAST CWA. LATEST 22Z HRRR AND 23Z RAP INDICATE MORE
WIDESPREAD REFLECTIVITIES MID TO LATE EVENING.
UPDATE ISSUED AT 518 PM CDT TUE MAR 11 2014
QUICK UPDATE TO ADD SOME LATE AFTERNOON SHOWERS ACROSS THE WEST.
AN AREA OF CONVECTIVE SHOWERS HAD DEVELOPED FROM AROUND WILLISTON
SOUTH THROUGH DICKINSON TO BOWMAN AND HETTINGER. THESE SHOULD
DISSIPATE QUICKLY EARLY THIS EVENING. TEXT PRODUCTS HAVE BEEN SENT.
&&
.SHORT TERM...(THIS EVENING THROUGH WEDNESDAY)
ISSUED AT 339 PM CDT TUE MAR 11 2014
THE MAIN FORECAST ISSUE CONCERNING THE WEATHER IS TEMPS TONIGHT/WEDNESDAY
AND LIGHT SNOW POTENTIAL EAST TONIGHT. OPERATIONALLY...THE MAIN CONCERN
WILL CONTINUE TO BE THE ONGOING FLOODING FROM SNOW MELT AND ISOLATED
ICE JAMES. SEE HYDRO DISCUSSION BELOW FOR ADDITIONAL DETAILS.
FOR TONIGHT...THERE IS GOOD MODEL CONSENSUS TO SUPPORT LIGHT SNOW
ALONG THE EASTERN FRINGE OF THE FORECAST AREA...FROM THE TURTLE
MOUNTAINS THROUGH THE JAMES RIVER VALLEY. WPC QPF AND SNOW RATIOS
AROUND 15:1 INDICATE SNOWFALL AMOUNTS AROUND AN INCH OR SO.
THE FAMILIAR RECENT TEMPERATURE PATTERN IS EXPECTED TO CONTINUE
OVERNIGHT AND WEDNESDAY...WARMER SOUTHWEST WITH NO SNOW
COVER...COLDER NORTH AND EAST WITH LINGERING SNOW PACK. HAVE LEANED
TOWARD THE BIAS-CORRECTED GUIDANCE WHICH IS DOING A BETTER JOB
HANDLING THE SNOW COVER VARIATIONS.
.LONG TERM...(WEDNESDAY NIGHT THROUGH TUESDAY)
ISSUED AT 339 PM CDT TUE MAR 11 2014
ABOVE NORMAL TEMPERATURES WILL HIGHLIGHT THE MAJORITY OF THE
EXTENDED FORECAST.
THE 12 UTC DETERMINISTIC AND ENSEMBLE SUITE IS IN GOOD AGREEMENT ON
A BROAD UPPER LEVEL RIDGE ACROSS THE WESTERN AND CENTRAL CONUS
WEDNESDAY AND THURSDAY...WITH A BRIEF BREAK DOWN FRIDAY INTO
SATURDAY...BEFORE THE RIDGE BUILDS AGAIN SUNDAY INTO NEXT WEEK.
THIS SUPPORTS A GENERALLY DRY OVERALL PATTERN WITH ABOVE NORMAL
TEMPERATURES...FOLLOWING THE WARMER EDGE OF GUIDANCE WHICH HAS
VERIFIED BEST WITH THE PATTERN CHANGE TO MILDER WEATHER AND THE
LOSS OF SNOW.
&&
.AVIATION...(FOR THE 06Z TAFS THROUGH 06Z WEDNESDAY NIGHT)
ISSUED AT 1157 PM CDT TUE MAR 11 2014
MVFR TO LOW VFR CIGS ACROSS KJMS WILL CONTINUE UNTIL 17Z WEDNESDAY.
ISOLATED SNOW SHOWERS WILL REMAIN A THREAT AT KJMS UNTIL 09Z WEDNESDAY
BEFORE ENDING. THE CURRENT SATELLITE IMAGERY AND RELATIVE HUMIDITY
FOREACST SUGGESTS THAT KMOT AND KBIS WILL REMAIN JUST FAR ENOUGH
WEST OF THE MVFR CIGS OVERNIGHT...BUT WILL MONITOR AND ADJUST IF
THIS CHANGES. KDIK/KISN WILL REMAIN VFR THROUGH THE OVERNIGHT WITH
ALL TERMINALS IN VFR STATUS WEDNESDAY INTO WENDESDAY NIGHT.
&&
.HYDROLOGY...
ISSUED AT 339 PM CDT TUE MAR 11 2014
MULTIPLE FLOOD HEADLINES REMAIN IN EFFECT ACROSS THE MISSOURI
BASIN. WET...DEEPLY FROZEN SOILS HAVE LEAD TO VERY HIGH RUNOFF
RATES OF THE MINIMAL SNOWPACK INTO THE AREA RIVERS AND
STREAMS...RESULTING IN ICE BREAK UP AND JAMS. A FLOOD WATCH HAS
BEEN ISSUED FOR THE HEART RIVER NEAR MANDAN THROUGH FRIDAY
EVENING. AS FLOWS INCREASE AND ICE FROM UPSTREAM MAKES ITS WAY
INTO THE AREA...THE RISK OF ICE JAMS NEAR MANDAN WILL INCREASE.
THE MISSOURI NEAR WILLISTON AT THIS TIME IS FORECAST TO RISE TO
NEAR 21.5 FEET WEDNESDAY NIGHT...SHY OF THE 22 FT FLOOD STAGE.
HOWEVER...THIS WILL HAVE TO BE CLOSELY MONITORED AS BROKEN ICE IN
THE SIDNEY AND FAIRVIEW STRETCHES OF THE YELLOWSTONE RIVER ARE
TRANSPORTED INTO THE WILLISTON AREA. WIDESPREAD RUNOFF...RIVER AND
STREAM RISES AND ICE JAM POTENTIAL WILL INCREASE ACROSS THE
SOURIS AND JAMES BASINS THROUGH THE END OF THE WEEK AS MILDER
WEATHER RETURNS TO THE AREA ONCE AGAIN.
&&
.BIS WATCHES/WARNINGS/ADVISORIES...
NONE.
&&
$$
UPDATE...KS
SHORT TERM...RK
LONG TERM...AYD
AVIATION...KS
HYDROLOGY...AYD
AREA FORECAST DISCUSSION
NWS NORMAN OK
1152 PM CDT TUE MAR 11 2014
.DISCUSSION...
12 MARCH 06Z AVIATION DISCUSSION IS BELOW.
&&
.AVIATION...
WINDS REMAIN THE PRIMARY AVIATION CONCERN. NORTH WINDS ACROSS
WRN AND CENTRAL OK INTO WRN N TX WILL PERSIST... 30 TO 35 KTS...
WITH GUSTS OF 40 TO 45 KTS THROUGH THE EARLY MORNING HOURS. ALONG
WITH WINDS... BLOWING DUST MAY IMPACT VISIBILITIES IN SOME
LOCATIONS... ALONG WITH INCREASING CIGS... WITH SOME FLIRTING
BETWEEN VFR AND MVFR THROUGH SUNRISE. BLOWING DUST ACROSS FAR WRN
OK AND WRN N TX MAY ALSO IMPACT AREA AIRFIELDS OVERNIGHT. WINDS
WILL SLOWLY DECREASE THROUGH SUNRISE... BUT REMAIN BREEZY THROUGH
THE AFTN... WITH GUSTS OF 25 TO 30 KTS. THE N/NW WINDS WILL
FINALLY CALM THROUGH THE END OF THE PERIOD AS SFC HIGH PRESSURE
SETTLES ACROSS THE SRN PLAINS THROUGH THURSDAY MORNING.
JTK
&&
.PREV DISCUSSION... /ISSUED 835 PM CDT TUE MAR 11 2014/
UPDATE...
UPDATE TO TEMPS... WINDS OVERNIGHT...
DISCUSSION...
12/01Z SFC ANALYSIS SHOWS THE LEADING WIND SHIFT OF THE COLD FRONT
HAS FINALLY CLEARED SOUTH CENTRAL OKLAHOMA. GUSTY N/NW WINDS HAVE
SPREAD ACROSS ALL OF CENTRAL AND WRN OK... AND WRN N TX. SUSTAINED
WINDS OF 25 TO 30 MPH... WITH GUSTS 35 TO 40 WILL CONTINUE THROUGH
THE EARLY MORNING HOURS. THIS IS BASED ON UPSTREAM OBS... WHERE
WINDS HAVE REMAINED STOUT ACROSS WRN KS... SUSTAINED 3O TO 35...
GUSTING 40 TO 50 MPH. THIS IS SUPPORTED BY THE STRONG PRESSURE
CHANGES BEHIND THE FRONT... 3HR PRESSURE CHANGES FROM THE RAP AND
H-TRIP SHOW 5 TO 8MB CHANGES ACROSS THE REGION... NOT TO MENTION
0-1KM LAPSE RATES OF 7 TO 9 C/KM. THE STRONGEST SIGNAL EXISTS
THROUGH 06Z... WHEN WINDS WILL SLOWLY EASE... WITH SUSTAINED WINDS
OF 15 TO 25... AND GUSTS 25 TO 30 MPH THROUGH SUNRISE. WINDS WILL
REMAIN OUT OF THE NORTH AND BREEZY THROUGH THE EARLY AFTN
WEDNESDAY.
ALSO ADJUSTED TEMPS... AS LOCATIONS ACROSS NWRN OK HAVE DROPPED
INTO THE MID 40S A TAD FASTER THAN EARLIER EXPECTED.
JTK
&&
.PRELIMINARY POINT TEMPS/POPS...
OKLAHOMA CITY OK 81 35 54 30 / 0 10 0 0
HOBART OK 83 33 56 30 / 0 10 0 0
WICHITA FALLS TX 90 35 58 32 / 0 0 10 0
GAGE OK 74 28 53 26 / 0 10 0 0
PONCA CITY OK 82 33 53 27 / 0 10 0 0
DURANT OK 81 38 56 35 / 0 0 10 0
&&
.OUN WATCHES/WARNINGS/ADVISORIES...
OK...WIND ADVISORY UNTIL 7 AM CDT WEDNESDAY FOR OKZ004>048-050>052.
TX...WIND ADVISORY UNTIL 7 AM CDT WEDNESDAY FOR TXZ083>090.
&&
$$
AREA FORECAST DISCUSSION
NWS STATE COLLEGE PA
754 AM EDT WED MAR 12 2014
.SYNOPSIS...
A STRONG LATE-WINTER STORM WILL IMPACT THE AREA TODAY...FOLLOWED
BY COLD AND BLUSTERY CONDITIONS WITH WELL-BELOW NORMAL
TEMPERATURES FOR THURSDAY. TEMPERATURES WILL REBOUND TO NEAR
SEASONAL LEVELS FRIDAY INTO THE WEEKEND...AHEAD OF A FRONTAL
SYSTEM PUSHING SOUTHEAST FROM THE GREAT LAKES. THIS FRONT MAY
PRODUCE SOME RAIN OR SNOW SHOWERS ON SATURDAY.
&&
.NEAR TERM /THROUGH TONIGHT/...
STRONG AND FAST MOVING STORM SYSTEM OVER WESTERN OHIO WILL SPREAD
SNOW...RAIN...THUNDER AND PERHAPS SEVERE WEATHER TO OUR REGION
LATER TODAY. TEMPERATURES IN NW WILL REMAIN IN LOW-MID 30S AND IN
SOUTHEASTERN AREAS...THEY SHOULD TOP 60. STRONG BAROCLINIC ZONE.
A FRONTAL BOUNDARY IS SAGGING INTO NORTHWESTERN PA WHICH WILL
PRODUCE THE QUICK CHANGE OVER TO SNOW IN NW PENNSYLVANIA THIS
MORNING. RADAR AND OBSERVATIONS SHOW SNOW OVER SOUTHERN MI AND OH.
IMPLIED SNOW BANDS OVER LAKE ERIE. THE TRACK OF THE LOW WILL KEEP
THE COLD AIR FROM PUSHING TOO DEEP INTO PENNSYLVANIA THIS MORNING
AND EARLY AFTERNOON. THUS WSW FOR HEAVY SNOW CURRENTLY CONFINED TO
NORTHWESTERN AREA. WITH ADVISORY TO SOUTH AND EAST AS COLD AIR
FILTERS IN.
MODELS SUGGEST FAST SYSTEM WITH RAIN AND POTENTIAL THUNDER LATER
THIS AFTERNOON/EARLY EVENING IN CENTRAL AND SOUTHEASTERN AREAS.
PREVIOUS DISCUSSION...
COUPLED JET STRUCTURE STILL LOOKING LIKE A CLASSIC EXAMPLE...AND
INTERACTION SHOULD DROP THE PRESSURE OF THE MAIN SFC LOW AS IT
TRAVERSES THE PA TURNPIKE THROUGH THE LATE MORNING AND INTO THE
EVENING. IT WILL TAKE IT/S OWN TOLL BY BRINGING MODERATE TO HEAVY
RAIN TO MOST OF THE STATE TODAY...BUT RUC POINTS TO A LOWERING OF
THE LI/S AND TRUE INSTABILITY ACROSS THE SRN THIRD/HALF OF THE
AREA LATE THIS AFTN AND EARLY THIS EVENING. SPC HAS A SLIGHT RISK
AREA COVERING THAT ROUGH AREA...AND HAVE ADDED GUSTY WIND WORDING
TO THE GRIDS FOR THAT TIME FRAME - RIGHT AS THE LOW PASSES
OVERHEAD.
THE SNOW WILL BE HEAVIEST IN THE N IN THE MID DAY AND AFTERNOON.
QPF IS IMPRESSIVE BUT MAY BE TAINTED BY CONVECTIVE FEEDBACK ON
SOME MDL SOLUTIONS. STILL...THE OVERALL PICTURE OF 1-1.25 INCHES N
AND 0.5-0.75 S IS LOOKING GOOD. THUS...WITH THE BULK OF THE PRECIP
FALLING AS SNOW ALONG THE NY BORDER...ESP WARREN AND MCKEAN
COS...THE GOING STORM TOTALS LOOK SOLID WITH 8-10 THERE. THE SNOW
ACCUMULATION GRADIENT WILL BE TIGHT - ESP DURING THE DAYTIME -
WITH ALMOST NO SNOW SOUTH OF ROUTE 6 IN THE MORNING AND NOT FAR S
OF THE NRN TIER OF COS THIS AFTERNOON...DESPITE FALLING TEMPS. THE
WARM AIR ALOFT IS JUST TOO MUCH AND SUN ANGLE NOW HIGH ENOUGH TO
MAKE THE SNOW FORECAST A REAL TROUBLE. AS THE TEMPS GET COLD THIS
AFTERNOON/EVENING...THERE IS A DANGER OF THE RAIN-WET ROADS
BECOMING ICY QUICKLY AS THE PRECIP TYPE CHANGE OVER OCCURS FROM N
TO S.
THE SFC LOW SHOULD CONTINUE TO DEEPEN AS IT MOVES INTO NJ THIS
EVENING. THE PRECIP SHOULD TAPER RATHER ABRUPTLY IN THE CENTRAL
AND SERN ZONES THIS EVENING. BY 01Z...LITTLE IF ANY PRECIP IS LEFT
THERE. SO BY THE TIME THE PROFILES GET COLD ENOUGH FOR SNOW
THERE...IT SHOULD BE ENDING. WILL KEEP ALL SNOW TOTALS AND TIMING
AS IS WITH JUST MINOR EDITING.
THE WINDS WILL GET STRONG/GUSTY IN THE NORTHERN MTS LATE THIS
MORNING...BUT THE PASSAGE OF THE LOW AND ANY STORMS IN THE SOUTH
WILL KICK THEM UP THERE IN THE EARLY EVENING.
&&
.SHORT TERM /THURSDAY/...
MADE MINOR CHANGES TO GRIDS WITH OVERNIGHT LOWS MAINLY NEAR 0 IN
NW TO TEENS SOUTHEAST. STILL FORECAST TO BE VERY COLD DAY.
UPDATED GUIDANCE WAS SIMILAR TO PREVIOUS FORECAST. CHANGES WERE
MINOR.
PREVIOUS...
THE SNOW SHOULD BE TAPERING OFF TO SCT SHSN IN THE EVENING ACROSS
THE NRN AND WRN MTS...BUT WILL KEEP CURRENT TIMING ON WSW FLAGS TO
ALLOW FOR LINGERING SNOW AND BLOWING SNOW PROBLEMS. LOW PRESSURE
CONTINUES TO DEEPEN AS IT MOVES AWAY AND CREATES WIND PROBLEMS FOR
THE LOCAL AREA. THE WINDS WILL GET FASTER ACROSS THE SRN HALF OF
THE AREA TONIGHT AND SUSTAINED SPEEDS AND GUSTS MAY BOTH REACH
WIND ADVY CRITERIA. HAVE THUS POSTED AN ADVY FOR THOSE AREAS
THROUGH THURSDAY NOON. WHILE WINDS WILL BE STRONGEST THERE IN THE
SOUTH...THE TEMPS DO NOT DROP FAST ENOUGH TO GET WIND CHILLS BELOW
ADVY THE LINE OF -15F. WILL ISSUE AN ADVY FOR THE NW HALF AS THE
CRITERIA SHOULD EASILY BE MET. IF THE TIMING OF THE SNOW WERE TO
BE ENDING LATER THURS MORNING...WE MAY HAVE BEEN ABLE TO FORGO A
WIND CHILL ADVY AND JUST WRAP IT INTO THE WSW. BUT THE CHILLS WILL
LAST MUCH LONGER THAN THE ACCUMULATING SNOW...THROUGH THE ENTIRE
MORNING...WHEREAS THE SNOW SHOULD BE VIRTUALLY DONE BY 2 AM/06Z.
THURSDAY SHOULD BE ONE OF THE COLDEST WE HAVE SEEN YET THIS
WINTER. THIS IS EVEN MORE IMPRESSIVE GIVEN THE MID-MARCH TIMING.
8H TEMPS DROP INTO THE MINUS 20S C IN THE MORNING...BUT THIS
NASTINESS GETS DRAGGED THROUGH THE AREA RATHER QUICKLY DUE TO THE
SHARPNESS OF THE TROUGH AND PROGRESSIVE NATURE OF THE FLOW ALOFT.
LITTLE BREAKS IN THE CLOUDS OVER THE S/SE OVERNIGHT SHOULD LEAD
TO GREATER BREAKS IN THE MORNING OVER THE SRN TIER AND SERN AREAS
COULD CLEAR UP TOTALLY BY THE END OF THE MORNING. WILL PLAY IT
MORE-CLOUDY THAN THAT FOR NOW. EVEN WITH THE SUN AND
DOWNSLOPE...THE MAXES IN THE SE WILL ONLY BE IN THE M/U20S. THAT
WOULD BE WELCOME IN THE NRN TIER WHERE MAXES MAY NOT MAKE IT INTO
THE TWEENS /10-12F/.
THE GUSTY WINDS WILL GRADUALLY SUBSIDE DURING THE DAY THURS WITH
DAYTIME HIGHS 25-30F BELOW NORMAL. DAILY RECORD LOW/MINI-MAXES ARE
IN JEOPARDY. IN ADDITION...LOW TEMPS THURS MORNING ACRS WRN PA
WILL ALSO BE NEAR DAILY RECORD. SUFFICE IT TO SAY...IT MAY NOT BE
THIS COLD AGAIN /ESPECIALLY DURING THE DAYLIGHT HOURS/ UNTIL NEXT
WINTER.
&&
.LONG TERM /THURSDAY NIGHT THROUGH TUESDAY/...
THE GOOD NEWS IS THAT THE COLD BLAST WILL BE SHORT-LIVED...WITH A
RAPID MODERATION OCCURRING ON FRIDAY. BREEZY SW RETURN FLOW IN
ADVANCE OF NRN CLIPPER SFC LOW TRACKING ACRS THE UPPER GREAT LAKES
AND DOWNSLOPING SHOULD HELP TO BOOST TEMPS INTO THE 40S NORTH AND
50S SOUTH. THE MODELS TURN THE LOW TO THE NORTHEAST UP THE ST.
LAWRENCE VLY ON DAY 5/SAT...DRAGGING A TRAILING/WEAK COLD FRONT
ACRS THE NORTHEAST AND MID-ATL STATES. MODEL CONSENSUS INDICATES
SOME LGT PCPN IS POSSIBLE WITH CHC POPS AS THE FRONT SHIFTS SEWD
ACRS THE CWA.
GEFS/EC ENSEMBLE MEANS SHOW THE LARGE SCALE PATTERN REVERTING BACK
TO A WRN RIDGE/ERN TROUGH CONFIGURATION INTO EARLY NEXT WEEK. THIS
HAS BEEN THE FAVORED/PREVAILING FLOW REGIME THIS WINTER...WITH A
COLD POLAR VORTEX OVER EASTERN CANADA. A STRONG SFC HIGH PUSHING
SEWD FROM THE UPPER MS VLY SHOULD DIRECT COLDER AIR INTO THE REGION
BEHIND A REINFORCING FROPA ON SUNDAY...WITH TEMPS LKLY TRENDING
LOWER BY DAY 7/MON. THE NON-NCEP OPRNL MODELS /12Z CMC AND ECMWF/
ARE MORE BULLISH ON CYCLOGENESIS INVOF THE GULF STREAM JUST EAST
OF THE CAROLINAS...WITH THE NW EDGE OF POTNL PCPN SHIELD POSSIBLY
REACHING SRN/SERN PA ON ST. PATRICK`S DAY. CONFIDENCE IS LOW GIVEN
THE LARGE SPREAD BTWN THE GFS AND ECMWF/CMC. SOMETHING TO MONITOR
IN THE DAYS TO COME.
&&
.AVIATION /12Z WEDNESDAY THROUGH SUNDAY/...
CONDITIONS NOW IFR ACROSS THE NW. STEADIER RAIN ACROSS THE NW.
EXPECT CONDITIONS TO TO GO DOWN HILL ACROSS THE REST OF THE
AREA...AS RAIN BECOMES MORE WIDESPREAD.
THE BIG CONCERN IS STRONG WINDS AND LLWS...ALONG WITH HEAVY
RAIN...AND PERHAPS SOME STRONG TO SEVERE THUNDERSTORMS ALONG
THE MD LINE. ALSO SNOW ACROSS THE NORTH BY AFT.
THEN TONIGHT THE CONCERN IS STILL STRONG WIND GUST...RAPID DROP
IN TEMPS...AND MORE SNOW.
THU WILL STILL FEATURE GUSTY WINDS...AS A DEEP STORM PULLS
AWAY FROM THE AREA.
OUTLOOK...
THU...STRONG/GUSTY N/NW WINDS...GRADUALLY DIMINISHING IN
THE AFTERNOON.
FRI-SUN...NO SIG WX EXPECTED.
&&
.HYDROLOGY...
WITH WARMER TEMPERATURES RAINFALL TODAY...WE EXPECT MODERATE
RISES ON RIVERS AND STREAMS. THERE IS STILL ENOUGH ICE IN SPOTS TO
LEAD TO ICE JAMS...THOUGH SIGNIFICANT DECAY HAS OCCURRED AT MANY
LOCATIONS DUE TO THE RECENTLY WARM WEATHER. ANY ICE JAMS WILL BE
ISOLATED IN NATURE. MONITOR WATER LEVELS CLOSELY FOR THE REST OF
THE WEEK.
&&
.CTP WATCHES/WARNINGS/ADVISORIES...
WIND CHILL ADVISORY FROM MIDNIGHT TONIGHT TO NOON EDT THURSDAY
FOR PAZ004>006-010>012-017-018-024-033-037-041-042.
WINTER WEATHER ADVISORY FROM 3 PM THIS AFTERNOON TO 8 AM EDT
THURSDAY FOR PAZ017-024-033.
WIND ADVISORY FROM 5 PM THIS AFTERNOON TO NOON EDT THURSDAY
FOR PAZ025>028-034>036-056>059-063>066.
WINTER WEATHER ADVISORY UNTIL 8 AM EDT THURSDAY FOR PAZ006-010-
011-037.
WINTER STORM WARNING UNTIL 8 AM EDT THURSDAY FOR PAZ004-005.
&&
$$
SYNOPSIS...DANGELO/LA CORTE
NEAR TERM...GRUMM/DANGELO
SHORT TERM...GRUMM/DANGELO
LONG TERM...STEINBUGL
AVIATION...MARTIN
HYDROLOGY...
AREA FORECAST DISCUSSION
NWS STATE COLLEGE PA
742 AM EDT WED MAR 12 2014
.SYNOPSIS...
A STRONG LATE-WINTER STORM WILL IMPACT THE AREA TODAY...FOLLOWED
BY COLD AND BLUSTERY CONDITIONS WITH WELL-BELOW NORMAL
TEMPERATURES FOR THURSDAY. TEMPERATURES WILL REBOUND TO NEAR
SEASONAL LEVELS FRIDAY INTO THE WEEKEND...AHEAD OF A FRONTAL
SYSTEM PUSHING SOUTHEAST FROM THE GREAT LAKES. THIS FRONT MAY
PRODUCE SOME RAIN OR SNOW SHOWERS ON SATURDAY.
&&
.NEAR TERM /THROUGH TONIGHT/...
LOTS OF ACTION THIS PERIOD WITH RAIN ALREADY STRAFING THE NRN
BORDER. MORE RADAR RETURN OVER CENTRAL OH ARE MOVING QUICKLY THIS
WAY. THE FRONTAL BOUNDARY IS LAID OUT FROM PHL ALONG THE MASON-
DIXON LINE TO KDAY AND KIND. SFC LOW IS CONSOLIDATING OVER THE
WABASH AND IS ABOUT 995MB AT 08Z. GUSTS ON THE BACKSIDE OF THE LOW
ARE ALREADY INTO THE 20S AND 30S. STRONG WARM ADVECTION OVER THE
STATE IS KEEPING TEMPS IN THE 40S...EXCEPT ALONG THE NY BORDER
WITH 30S NUDGING IN ON LIGHT N/NE WIND. DEWPOINTS HAVE RISEN
SLIGHTLY AND ARE GENERALLY IN THE 30S. WET BULBS IN THE NRN MTS
WILL STILL LIKELY YIELD RAIN AT FIRST...BUT NAM/RUC PROFILES DO
MAKE IT MAINLY ISOTHERMAL FOR THE LOWEST FEW KFT THIS MORNING.
THUS...IT COULD BE ANYTHING FOR THE FIRST FEW HOURS. THEN...IT
GETS COLD AS PRECIP INTENSITY SHOULD PICK UP LATER THIS MORNING.
COUPLED JET STRUCTURE STILL LOOKING LIKE A CLASSIC EXAMPLE...AND
INTERACTION SHOULD DROP THE PRESSURE OF THE MAIN SFC LOW AS IT
TRAVERSES THE PA TURNPIKE THROUGH THE LATE MORNING AND INTO THE
EVENING. IT WILL TAKE IT/S OWN TOLL BY BRINGING MODERATE TO HEAVY
RAIN TO MOST OF THE STATE TODAY...BUT RUC POINTS TO A LOWERING OF
THE LI/S AND TRUE INSTABILITY ACROSS THE SRN THIRD/HALF OF THE
AREA LATE THIS AFTN AND EARLY THIS EVENING. SPC HAS A SLIGHT RISK
AREA COVERING THAT ROUGH AREA...AND HAVE ADDED GUSTY WIND WORDING
TO THE GRIDS FOR THAT TIME FRAME - RIGHT AS THE LOW PASSES
OVERHEAD.
THE SNOW WILL BE HEAVIEST IN THE N IN THE MID DAY AND AFTERNOON.
QPF IS IMPRESSIVE BUT MAY BE TAINTED BY CONVECTIVE FEEDBACK ON
SOME MDL SOLUTIONS. STILL...THE OVERALL PICTURE OF 1-1.25 INCHES N
AND 0.5-0.75 S IS LOOKING GOOD. THUS...WITH THE BULK OF THE PRECIP
FALLING AS SNOW ALONG THE NY BORDER...ESP WARREN AND MCKEAN
COS...THE GOING STORM TOTALS LOOK SOLID WITH 8-10 THERE. THE SNOW
ACCUMULATION GRADIENT WILL BE TIGHT - ESP DURING THE DAYTIME -
WITH ALMOST NO SNOW SOUTH OF ROUTE 6 IN THE MORNING AND NOT FAR S
OF THE NRN TIER OF COS THIS AFTERNOON...DESPITE FALLING TEMPS. THE
WARM AIR ALOFT IS JUST TOO MUCH AND SUN ANGLE NOW HIGH ENOUGH TO
MAKE THE SNOW FORECAST A REAL TROUBLE. AS THE TEMPS GET COLD THIS
AFTERNOON/EVENING...THERE IS A DANGER OF THE RAIN-WET ROADS
BECOMING ICY QUICKLY AS THE PRECIP TYPE CHANGE OVER OCCURS FROM N
TO S.
THE SFC LOW SHOULD CONTINUE TO DEEPEN AS IT MOVES INTO NJ THIS
EVENING. THE PRECIP SHOULD TAPER RATHER ABRUPTLY IN THE CENTRAL
AND SERN ZONES THIS EVENING. BY 01Z...LITTLE IF ANY PRECIP IS LEFT
THERE. SO BY THE TIME THE PROFILES GET COLD ENOUGH FOR SNOW
THERE...IT SHOULD BE ENDING. WILL KEEP ALL SNOW TOTALS AND TIMING
AS IS WITH JUST MINOR EDITING.
THE WINDS WILL GET STRONG/GUSTY IN THE NORTHERN MTS LATE THIS
MORNING...BUT THE PASSAGE OF THE LOW AND ANY STORMS IN THE SOUTH
WILL KICK THEM UP THERE IN THE EARLY EVENING.
&&
.SHORT TERM /THURSDAY/...
THE SNOW SHOULD BE TAPERING OFF TO SCT SHSN IN THE EVENING ACROSS
THE NRN AND WRN MTS...BUT WILL KEEP CURRENT TIMING ON WSW FLAGS TO
ALLOW FOR LINGERING SNOW AND BLOWING SNOW PROBLEMS. LOW PRESSURE
CONTINUES TO DEEPEN AS IT MOVES AWAY AND CREATES WIND PROBLEMS
FOR THE LOCAL AREA. THE WINDS WILL GET FASTER ACROSS THE SRN HALF OF
THE AREA TONIGHT AND SUSTAINED SPEEDS AND GUSTS MAY BOTH REACH
WIND ADVY CRITERIA. HAVE THUS POSTED AN ADVY FOR THOSE AREAS
THROUGH THURSDAY NOON. WHILE WINDS WILL BE STRONGEST THERE IN THE
SOUTH...THE TEMPS DO NOT DROP FAST ENOUGH TO GET WIND CHILLS BELOW
ADVY THE LINE OF -15F. WILL ISSUE AN ADVY FOR THE NW HALF AS THE
CRITERIA SHOULD EASILY BE MET. IF THE TIMING OF THE SNOW WERE TO
BE ENDING LATER THURS MORNING...WE MAY HAVE BEEN ABLE TO FORGO A
WIND CHILL ADVY AND JUST WRAP IT INTO THE WSW. BUT THE CHILLS WILL
LAST MUCH LONGER THAN THE ACCUMULATING SNOW...THROUGH THE ENTIRE
MORNING...WHEREAS THE SNOW SHOULD BE VIRTUALLY DONE BY 2 AM/06Z.
THURSDAY SHOULD BE ONE OF THE COLDEST WE HAVE SEEN YET THIS
WINTER. THIS IS EVEN MORE IMPRESSIVE GIVEN THE MID-MARCH TIMING.
8H TEMPS DROP INTO THE MINUS 20S C IN THE MORNING...BUT THIS
NASTINESS GETS DRAGGED THROUGH THE AREA RATHER QUICKLY DUE TO THE
SHARPNESS OF THE TROUGH AND PROGRESSIVE NATURE OF THE FLOW ALOFT.
LITTLE BREAKS IN THE CLOUDS OVER THE S/SE OVERNIGHT SHOULD LEAD
TO GREATER BREAKS IN THE MORNING OVER THE SRN TIER AND SERN AREAS
COULD CLEAR UP TOTALLY BY THE END OF THE MORNING. WILL PLAY IT
MORE-CLOUDY THAN THAT FOR NOW. EVEN WITH THE SUN AND
DOWNSLOPE...THE MAXES IN THE SE WILL ONLY BE IN THE M/U20S. THAT
WOULD BE WELCOME IN THE NRN TIER WHERE MAXES MAY NOT MAKE IT INTO
THE TWEENS /10-12F/.
THE GUSTY WINDS WILL GRADUALLY SUBSIDE DURING THE DAY THURS WITH
DAYTIME HIGHS 25-30F BELOW NORMAL. DAILY RECORD LOW/MINI-MAXES ARE
IN JEOPARDY. IN ADDITION...LOW TEMPS THURS MORNING ACRS WRN PA
WILL ALSO BE NEAR DAILY RECORD. SUFFICE IT TO SAY...IT MAY NOT BE
THIS COLD AGAIN /ESPECIALLY DURING THE DAYLIGHT HOURS/ UNTIL NEXT
WINTER.
&&
.LONG TERM /THURSDAY NIGHT THROUGH TUESDAY/...
THE GOOD NEWS IS THAT THE COLD BLAST WILL BE SHORT-LIVED...WITH A
RAPID MODERATION OCCURRING ON FRIDAY. BREEZY SW RETURN FLOW IN
ADVANCE OF NRN CLIPPER SFC LOW TRACKING ACRS THE UPPER GREAT LAKES
AND DOWNSLOPING SHOULD HELP TO BOOST TEMPS INTO THE 40S NORTH AND
50S SOUTH. THE MODELS TURN THE LOW TO THE NORTHEAST UP THE ST.
LAWRENCE VLY ON DAY 5/SAT...DRAGGING A TRAILING/WEAK COLD FRONT
ACRS THE NORTHEAST AND MID-ATL STATES. MODEL CONSENSUS INDICATES
SOME LGT PCPN IS POSSIBLE WITH CHC POPS AS THE FRONT SHIFTS SEWD
ACRS THE CWA.
GEFS/EC ENSEMBLE MEANS SHOW THE LARGE SCALE PATTERN REVERTING BACK
TO A WRN RIDGE/ERN TROUGH CONFIGURATION INTO EARLY NEXT WEEK. THIS
HAS BEEN THE FAVORED/PREVAILING FLOW REGIME THIS WINTER...WITH A
COLD POLAR VORTEX OVER EASTERN CANADA. A STRONG SFC HIGH PUSHING
SEWD FROM THE UPPER MS VLY SHOULD DIRECT COLDER AIR INTO THE REGION
BEHIND A REINFORCING FROPA ON SUNDAY...WITH TEMPS LKLY TRENDING
LOWER BY DAY 7/MON. THE NON-NCEP OPRNL MODELS /12Z CMC AND ECMWF/
ARE MORE BULLISH ON CYCLOGENESIS INVOF THE GULF STREAM JUST EAST
OF THE CAROLINAS...WITH THE NW EDGE OF POTNL PCPN SHIELD POSSIBLY
REACHING SRN/SERN PA ON ST. PATRICK`S DAY. CONFIDENCE IS LOW GIVEN
THE LARGE SPREAD BTWN THE GFS AND ECMWF/CMC. SOMETHING TO MONITOR
IN THE DAYS TO COME.
&&
.AVIATION /12Z WEDNESDAY THROUGH SUNDAY/...
CONDITIONS NOW IFR ACROSS THE NW. STEADIER RAIN ACROSS THE NW.
EXPECT CONDITIONS TO TO GO DOWN HILL ACROSS THE REST OF THE
AREA...AS RAIN BECOMES MORE WIDESPREAD.
THE BIG CONCERN IS STRONG WINDS AND LLWS...ALONG WITH HEAVY
RAIN...AND PERHAPS SOME STRONG TO SEVERE THUNDERSTORMS ALONG
THE MD LINE. ALSO SNOW ACROSS THE NORTH BY AFT.
THEN TONIGHT THE CONCERN IS STILL STRONG WIND GUST...RAPID DROP
IN TEMPS...AND MORE SNOW.
THU WILL STILL FEATURE GUSTY WINDS...AS A DEEP STORM PULLS
AWAY FROM THE AREA.
OUTLOOK...
THU...STRONG/GUSTY N/NW WINDS...GRADUALLY DIMINISHING IN
THE AFTERNOON.
FRI-SUN...NO SIG WX EXPECTED.
&&
.HYDROLOGY...
WITH WARMER TEMPERATURES RAINFALL TODAY...WE EXPECT MODERATE
RISES ON RIVERS AND STREAMS. THERE IS STILL ENOUGH ICE IN SPOTS TO
LEAD TO ICE JAMS...THOUGH SIGNIFICANT DECAY HAS OCCURRED AT MANY
LOCATIONS DUE TO THE RECENTLY WARM WEATHER. ANY ICE JAMS WILL BE
ISOLATED IN NATURE. MONITOR WATER LEVELS CLOSELY FOR THE REST OF
THE WEEK.
&&
.CTP WATCHES/WARNINGS/ADVISORIES...
WIND CHILL ADVISORY FROM MIDNIGHT TONIGHT TO NOON EDT THURSDAY
FOR PAZ004>006-010>012-017-018-024-033-037-041-042.
WINTER WEATHER ADVISORY FROM 3 PM THIS AFTERNOON TO 8 AM EDT
THURSDAY FOR PAZ017-024-033.
WIND ADVISORY FROM 5 PM THIS AFTERNOON TO NOON EDT THURSDAY
FOR PAZ025>028-034>036-056>059-063>066.
WINTER WEATHER ADVISORY UNTIL 8 AM EDT THURSDAY FOR PAZ006-010-
011-037.
WINTER STORM WARNING UNTIL 8 AM EDT THURSDAY FOR PAZ004-005.
&&
$$
SYNOPSIS...DANGELO/LA CORTE
NEAR TERM...DANGELO
SHORT TERM...DANGELO
LONG TERM...STEINBUGL
AVIATION...MARTIN
HYDROLOGY...CR
AREA FORECAST DISCUSSION
NWS STATE COLLEGE PA
601 AM EDT WED MAR 12 2014
.SYNOPSIS...
A STRONG LATE-WINTER STORM WILL IMPACT THE AREA TODAY...FOLLOWED
BY COLD AND BLUSTERY CONDITIONS WITH WELL-BELOW NORMAL
TEMPERATURES FOR THURSDAY. TEMPERATURES WILL REBOUND TO NEAR
SEASONAL LEVELS FRIDAY INTO THE WEEKEND...AHEAD OF A FRONTAL
SYSTEM PUSHING SOUTHEAST FROM THE GREAT LAKES. THIS FRONT MAY
PRODUCE SOME RAIN OR SNOW SHOWERS ON SATURDAY.
&&
.NEAR TERM /THROUGH TONIGHT/...
LOTS OF ACTION THIS PERIOD WITH RAIN ALREADY STRAFING THE NRN
BORDER. MORE RADAR RETURN OVER CENTRAL OH ARE MOVING QUICKLY THIS
WAY. THE FRONTAL BOUNDARY IS LAID OUT FROM PHL ALONG THE MASON-
DIXON LINE TO KDAY AND KIND. SFC LOW IS CONSOLIDATING OVER THE
WABASH AND IS ABOUT 995MB AT 08Z. GUSTS ON THE BACKSIDE OF THE LOW
ARE ALREADY INTO THE 20S AND 30S. STRONG WARM ADVECTION OVER THE
STATE IS KEEPING TEMPS IN THE 40S...EXCEPT ALONG THE NY BORDER
WITH 30S NUDGING IN ON LIGHT N/NE WIND. DEWPOINTS HAVE RISEN
SLIGHTLY AND ARE GENERALLY IN THE 30S. WET BULBS IN THE NRN MTS
WILL STILL LIKELY YIELD RAIN AT FIRST...BUT NAM/RUC PROFILES DO
MAKE IT MAINLY ISOTHERMAL FOR THE LOWEST FEW KFT THIS MORNING.
THUS...IT COULD BE ANYTHING FOR THE FIRST FEW HOURS. THEN...IT
GETS COLD AS PRECIP INTENSITY SHOULD PICK UP LATER THIS MORNING.
COUPLED JET STRUCTURE STILL LOOKING LIKE A CLASSIC EXAMPLE...AND
INTERACTION SHOULD DROP THE PRESSURE OF THE MAIN SFC LOW AS IT
TRAVERSES THE PA TURNPIKE THROUGH THE LATE MORNING AND INTO THE
EVENING. IT WILL TAKE IT/S OWN TOLL BY BRINGING MODERATE TO HEAVY
RAIN TO MOST OF THE STATE TODAY...BUT RUC POINTS TO A LOWERING OF
THE LI/S AND TRUE INSTABILITY ACROSS THE SRN THIRD/HALF OF THE
AREA LATE THIS AFTN AND EARLY THIS EVENING. SPC HAS A SLIGHT RISK
AREA COVERING THAT ROUGH AREA...AND HAVE ADDED GUSTY WIND WORDING
TO THE GRIDS FOR THAT TIME FRAME - RIGHT AS THE LOW PASSES
OVERHEAD.
THE SNOW WILL BE HEAVIEST IN THE N IN THE MID DAY AND AFTERNOON.
QPF IS IMPRESSIVE BUT MAY BE TAINTED BY CONVECTIVE FEEDBACK ON
SOME MDL SOLUTIONS. STILL...THE OVERALL PICTURE OF 1-1.25 INCHES N
AND 0.5-0.75 S IS LOOKING GOOD. THUS...WITH THE BULK OF THE PRECIP
FALLING AS SNOW ALONG THE NY BORDER...ESP WARREN AND MCKEAN
COS...THE GOING STORM TOTALS LOOK SOLID WITH 8-10 THERE. THE SNOW
ACCUMULATION GRADIENT WILL BE TIGHT - ESP DURING THE DAYTIME -
WITH ALMOST NO SNOW SOUTH OF ROUTE 6 IN THE MORNING AND NOT FAR S
OF THE NRN TIER OF COS THIS AFTERNOON...DESPITE FALLING TEMPS. THE
WARM AIR ALOFT IS JUST TOO MUCH AND SUN ANGLE NOW HIGH ENOUGH TO
MAKE THE SNOW FORECAST A REAL TROUBLE. AS THE TEMPS GET COLD THIS
AFTERNOON/EVENING...THERE IS A DANGER OF THE RAIN-WET ROADS
BECOMING ICY QUICKLY AS THE PRECIP TYPE CHANGE OVER OCCURS FROM N
TO S.
THE SFC LOW SHOULD CONTINUE TO DEEPEN AS IT MOVES INTO NJ THIS
EVENING. THE PRECIP SHOULD TAPER RATHER ABRUPTLY IN THE CENTRAL
AND SERN ZONES THIS EVENING. BY 01Z...LITTLE IF ANY PRECIP IS LEFT
THERE. SO BY THE TIME THE PROFILES GET COLD ENOUGH FOR SNOW
THERE...IT SHOULD BE ENDING. WILL KEEP ALL SNOW TOTALS AND TIMING
AS IS WITH JUST MINOR EDITING.
THE WINDS WILL GET STRONG/GUSTY IN THE NORTHERN MTS LATE THIS
MORNING...BUT THE PASSAGE OF THE LOW AND ANY STORMS IN THE SOUTH
WILL KICK THEM UP THERE IN THE EARLY EVENING.
&&
.SHORT TERM /THURSDAY/...
THE SNOW SHOULD BE TAPERING OFF TO SCT SHSN IN THE EVENING ACROSS
THE NRN AND WRN MTS...BUT WILL KEEP CURRENT TIMING ON WSW FLAGS TO
ALLOW FOR LINGERING SNOW AND BLOWING SNOW PROBLEMS. LOW PRESSURE
CONTINUES TO DEEPEN AS IT MOVES AWAY AND CREATES WIND PROBLEMS
FOR THE LOCAL AREA. THE WINDS WILL GET FASTER ACROSS THE SRN HALF OF
THE AREA TONIGHT AND SUSTAINED SPEEDS AND GUSTS MAY BOTH REACH
WIND ADVY CRITERIA. HAVE THUS POSTED AN ADVY FOR THOSE AREAS
THROUGH THURSDAY NOON. WHILE WINDS WILL BE STRONGEST THERE IN THE
SOUTH...THE TEMPS DO NOT DROP FAST ENOUGH TO GET WIND CHILLS BELOW
ADVY THE LINE OF -15F. WILL ISSUE AN ADVY FOR THE NW HALF AS THE
CRITERIA SHOULD EASILY BE MET. IF THE TIMING OF THE SNOW WERE TO
BE ENDING LATER THURS MORNING...WE MAY HAVE BEEN ABLE TO FORGO A
WIND CHILL ADVY AND JUST WRAP IT INTO THE WSW. BUT THE CHILLS WILL
LAST MUCH LONGER THAN THE ACCUMULATING SNOW...THROUGH THE ENTIRE
MORNING...WHEREAS THE SNOW SHOULD BE VIRTUALLY DONE BY 2 AM/06Z.
THURSDAY SHOULD BE ONE OF THE COLDEST WE HAVE SEEN YET THIS
WINTER. THIS IS EVEN MORE IMPRESSIVE GIVEN THE MID-MARCH TIMING.
8H TEMPS DROP INTO THE MINUS 20S C IN THE MORNING...BUT THIS
NASTINESS GETS DRAGGED THROUGH THE AREA RATHER QUICKLY DUE TO THE
SHARPNESS OF THE TROUGH AND PROGRESSIVE NATURE OF THE FLOW ALOFT.
LITTLE BREAKS IN THE CLOUDS OVER THE S/SE OVERNIGHT SHOULD LEAD
TO GREATER BREAKS IN THE MORNING OVER THE SRN TIER AND SERN AREAS
COULD CLEAR UP TOTALLY BY THE END OF THE MORNING. WILL PLAY IT
MORE-CLOUDY THAN THAT FOR NOW. EVEN WITH THE SUN AND
DOWNSLOPE...THE MAXES IN THE SE WILL ONLY BE IN THE M/U20S. THAT
WOULD BE WELCOME IN THE NRN TIER WHERE MAXES MAY NOT MAKE IT INTO
THE TWEENS /10-12F/.
THE GUSTY WINDS WILL GRADUALLY SUBSIDE DURING THE DAY THURS WITH
DAYTIME HIGHS 25-30F BELOW NORMAL. DAILY RECORD LOW/MINI-MAXES ARE
IN JEOPARDY. IN ADDITION...LOW TEMPS THURS MORNING ACRS WRN PA
WILL ALSO BE NEAR DAILY RECORD. SUFFICE IT TO SAY...IT MAY NOT BE
THIS COLD AGAIN /ESPECIALLY DURING THE DAYLIGHT HOURS/ UNTIL NEXT
WINTER.
&&
.LONG TERM /THURSDAY NIGHT THROUGH TUESDAY/...
THE GOOD NEWS IS THAT THE COLD BLAST WILL BE SHORT-LIVED...WITH A
RAPID MODERATION OCCURRING ON FRIDAY. BREEZY SW RETURN FLOW IN
ADVANCE OF NRN CLIPPER SFC LOW TRACKING ACRS THE UPPER GREAT LAKES
AND DOWNSLOPING SHOULD HELP TO BOOST TEMPS INTO THE 40S NORTH AND
50S SOUTH. THE MODELS TURN THE LOW TO THE NORTHEAST UP THE ST.
LAWRENCE VLY ON DAY 5/SAT...DRAGGING A TRAILING/WEAK COLD FRONT
ACRS THE NORTHEAST AND MID-ATL STATES. MODEL CONSENSUS INDICATES
SOME LGT PCPN IS POSSIBLE WITH CHC POPS AS THE FRONT SHIFTS SEWD
ACRS THE CWA.
GEFS/EC ENSEMBLE MEANS SHOW THE LARGE SCALE PATTERN REVERTING BACK
TO A WRN RIDGE/ERN TROUGH CONFIGURATION INTO EARLY NEXT WEEK. THIS
HAS BEEN THE FAVORED/PREVAILING FLOW REGIME THIS WINTER...WITH A
COLD POLAR VORTEX OVER EASTERN CANADA. A STRONG SFC HIGH PUSHING
SEWD FROM THE UPPER MS VLY SHOULD DIRECT COLDER AIR INTO THE REGION
BEHIND A REINFORCING FROPA ON SUNDAY...WITH TEMPS LKLY TRENDING
LOWER BY DAY 7/MON. THE NON-NCEP OPRNL MODELS /12Z CMC AND ECMWF/
ARE MORE BULLISH ON CYCLOGENESIS INVOF THE GULF STREAM JUST EAST
OF THE CAROLINAS...WITH THE NW EDGE OF POTNL PCPN SHIELD POSSIBLY
REACHING SRN/SERN PA ON ST. PATRICK`S DAY. CONFIDENCE IS LOW GIVEN
THE LARGE SPREAD BTWN THE GFS AND ECMWF/CMC. SOMETHING TO MONITOR
IN THE DAYS TO COME.
&&
.AVIATION /10Z WEDNESDAY THROUGH SUNDAY/...
CIGS COMING DOWN ACROSS THE NW...BFD AREA.
09Z TAFS SENT.
EARLIER DISCUSSION BELOW.
AS NOTED BELOW...VFR CONDITIONS WILL PREVAIL FOR A WHILE
LONGER...MAIN AREA OF RAIN NORTH PA BORDER.
06Z TAFS SENT.
EARLIER DISCUSSION BELOW.
VFR CONDITIONS WILL CONTINUE THROUGH THE FIRST HALF OF THE
OVERNIGHT PERIOD.
SAT SHOWS LOW TO MID CLOUDS STREAMING THROUGH WITH CEILINGS AT
MOST TAF SITES. THESE WILL SLOWLY LOWER AS THE NIGHT CONTINUES AND
RESTRICTIONS WILL ARRIVE AS LIGHT RAIN /AND POSS SNOW NORTH/
AROUND 06Z IN THE NW...AND HEAVIER AREA OF PRECIP ARRIVING STARTING
AROUND 12Z WED. BULK OF HEAVIER PRECIPITATION WILL BE BETWEEN LATE
WED MORNING AND EARLY WEDNESDAY EVENING.
WIDESPREAD ADVERSE CONDITIONS ON WED...WITH RAIN ACROSS MUCH OF
THE AREA...SNOW ACROSS THE FAR NORTH...AND SOME RISK OF STRONG
TSTMS NEAR THE MD BORDER. BY AFTERNOON...STRONG WIND FIELDS WILL
BRING INCREASING NORTHERLY FLOW...LLWS...AND GUSTY WINDS UP TO 40
MPH. THESE CONTINUE THROUGH THE FIRST HALF OF THU AS VERY COLD AIR
STAMPEDES INTO PA. WITH STRONG STORM DYNAMICS...CONCERN EXISTS FOR
A BURST OF HEAVY WET CONVECTIVE SNOW /AND POSS THUNDER/ NEAR THE
CENTER OF THE LOW WED/WED NIGHT.
HAVE UPDATED TAFS WITH LLWS AT ALL CENTRAL AND WESTERN TAF SITES
FROM 16Z TO AROUND 22Z.
OUTLOOK...
WED...WIDESPREAD MVFR- IFR
RESTRICTIONS IN RAIN AND SNOW. STRONG N/NW WINDS DEVELOPING. LLWS.
THU...STRONG/GUSTY N/NW WINDS...GRADUALLY DIMINISHING IN THE
AFTERNOON. FRI-SUN...NO SIG WX EXPECTED.
&&
.HYDROLOGY...
WITH WARMER TEMPERATURES RAINFALL TODAY...WE EXPECT MODERATE
RISES ON RIVERS AND STREAMS. THERE IS STILL ENOUGH ICE IN SPOTS TO
LEAD TO ICE JAMS...THOUGH SIGNIFICANT DECAY HAS OCCURRED AT MANY
LOCATIONS DUE TO THE RECENTLY WARM WEATHER. ANY ICE JAMS WILL BE
ISOLATED IN NATURE. MONITOR WATER LEVELS CLOSELY FOR THE REST OF
THE WEEK.
&&
.CTP WATCHES/WARNINGS/ADVISORIES...
WIND CHILL ADVISORY FROM MIDNIGHT TONIGHT TO NOON EDT THURSDAY
FOR PAZ004>006-010>012-017-018-024-033-037-041-042.
WINTER WEATHER ADVISORY FROM 3 PM THIS AFTERNOON TO 8 AM EDT
THURSDAY FOR PAZ017-024-033.
WIND ADVISORY FROM 5 PM THIS AFTERNOON TO NOON EDT THURSDAY
FOR PAZ025>028-034>036-056>059-063>066.
WINTER WEATHER ADVISORY UNTIL 8 AM EDT THURSDAY FOR PAZ006-010-
011-037.
WINTER STORM WARNING UNTIL 8 AM EDT THURSDAY FOR PAZ004-005.
&&
$$
SYNOPSIS...DANGELO/LA CORTE
NEAR TERM...DANGELO
SHORT TERM...DANGELO
LONG TERM...STEINBUGL
AVIATION...CERU/MARTIN/RXR
HYDROLOGY...CR
AREA FORECAST DISCUSSION
NWS STATE COLLEGE PA
425 AM EDT WED MAR 12 2014
.SYNOPSIS...
A STRONG LATE-WINTER STORM WILL IMPACT THE AREA TODAY...FOLLOWED
BY COLD AND BLUSTERY CONDITIONS WITH WELL-BELOW NORMAL
TEMPERATURES FOR THURSDAY. TEMPERATURES WILL REBOUND TO NEAR
SEASONAL LEVELS FRIDAY INTO THE WEEKEND...AHEAD OF A FRONTAL
SYSTEM PUSHING SOUTHEAST FROM THE GREAT LAKES. THIS FRONT MAY
PRODUCE SOME RAIN OR SNOW SHOWERS ON SATURDAY.
&&
.NEAR TERM /THROUGH TODAY/...
LOTS OF ACTION THIS PERIOD WITH RAIN ALREADY STRAFING THE NRN
BORDER. MORE RADAR RETURN OVER CENTRAL OH ARE MOVING QUICKLY THIS
WAY. THE FRONTAL BOUNDARY IS LAID OUT FROM PHL ALONG THE MASON-
DIXON LINE TO KDAY AND KIND. SFC LOW IS CONSOLIDATING OVER THE
WABASH AND IS ABOUT 995MB AT 08Z. GUSTS ON THE BACKSIDE OF THE LOW
ARE ALREADY INTO THE 20S AND 30S. STRONG WARM ADVECTION OVER THE
STATE IS KEEPING TEMPS IN THE 40S...EXCEPT ALONG THE NY BORDER
WITH 30S NUDGING IN ON LIGHT N/NE WIND. DEWPOINTS HAVE RISEN
SLIGHTLY AND ARE GENERALLY IN THE 30S. WET BULBS IN THE NRN MTS
WILL STILL LIKELY YIELD RAIN AT FIRST...BUT NAM/RUC PROFILES DO
MAKE IT MAINLY ISOTHERMAL FOR THE LOWEST FEW KFT THIS MORNING.
THUS...IT COULD BE ANYTHING FOR THE FIRST FEW HOURS. THEN...IT
GETS COLD AS PRECIP INTENSITY SHOULD PICK UP LATER THIS MORNING.
COUPLED JET STRUCTURE STILL LOOKING LIKE A CLASSIC EXAMPLE...AND
INTERACTION SHOULD DROP THE PRESSURE OF THE MAIN SFC LOW AS IT
TRAVERSES THE PA TURNPIKE THROUGH THE LATE MORNING AND INTO THE
EVENING. IT WILL TAKE IT/S OWN TOLL BY BRINGING MODERATE TO HEAVY
RAIN TO MOST OF THE STATE TODAY...BUT RUC POINTS TO A LOWERING OF
THE LI/S AND TRUE INSTABILITY ACROSS THE SRN THIRD/HALF OF THE
AREA LATE THIS AFTN AND EARLY THIS EVENING. SPC HAS A SLIGHT RISK
AREA COVERING THAT ROUGH AREA...AND HAVE ADDED GUSTY WIND WORDING
TO THE GRIDS FOR THAT TIME FRAME - RIGHT AS THE LOW PASSES
OVERHEAD.
THE SNOW WILL BE HEAVIEST IN THE N IN THE MID DAY AND AFTERNOON.
QPF IS IMPRESSIVE BUT MAY BE TAINTED BY CONVECTIVE FEEDBACK ON
SOME MDL SOLUTIONS. STILL...THE OVERALL PICTURE OF 1-1.25 INCHES N
AND 0.5-0.75 S IS LOOKING GOOD. THUS...WITH THE BULK OF THE PRECIP
FALLING AS SNOW ALONG THE NY BORDER...ESP WARREN AND MCKEAN
COS...THE GOING STORM TOTALS LOOK SOLID WITH 8-10 THERE. THE SNOW
ACCUMULATION GRADIENT WILL BE TIGHT - ESP DURING THE DAYTIME -
WITH ALMOST NO SNOW SOUTH OF ROUTE 6 IN THE MORNING AND NOT FAR S
OF THE NRN TIER OF COS THIS AFTERNOON...DESPITE FALLING TEMPS. THE
WARM AIR ALOFT IS JUST TOO MUCH AND SUN ANGLE NOW HIGH ENOUGH TO
MAKE THE SNOW FORECAST A REAL TROUBLE. AS THE TEMPS GET COLD THIS
AFTERNOON/EVENING...THERE IS A DANGER OF THE RAIN-WET ROADS
BECOMING ICY QUICKLY AS THE PRECIP TYPE CHANGE OVER OCCURS FROM N
TO S.
THE SFC LOW SHOULD CONTINUE TO DEEPEN AS IT MOVES INTO NJ THIS
EVENING. THE PRECIP SHOULD TAPER RATHER ABRUPTLY IN THE CENTRAL
AND SERN ZONES THIS EVENING. BY 01Z...LITTLE IF ANY PRECIP IS LEFT
THERE. SO BY THE TIME THE PROFILES GET COLD ENOUGH FOR SNOW
THERE...IT SHOULD BE ENDING. WILL KEEP ALL SNOW TOTALS AND TIMING
AS IS WITH JUST MINOR EDITING.
THE WINDS WILL GET STRONG/GUSTY IN THE NORTHERN MTS LATE THIS
MORNING...BUT THE PASSAGE OF THE LOW AND ANY STORMS IN THE SOUTH
WILL KICK THEM UP THERE IN THE EARLY EVENING.
&&
.SHORT TERM /TONIGHT THROUGH 6 PM THURSDAY/...
THE SNOW SHOULD BE TAPERING OFF TO SCT SHSN IN THE EVENING ACROSS
THE NRN AND WRN MTS...BUT WILL KEEP CURRENT TIMING ON WSW FLAGS TO
ALLOW FOR LINGERING SNOW AND BLOWING SNOW PROBLEMS. LOW PRESSURE
CONTINUES TO DEEPEN AS IT MOVES AWAY AND CREATES WIND PROBLEMS
FOR THE LOCAL AREA. THE WINDS WILL GET FASTER ACROSS THE SRN HALF OF
THE AREA TONIGHT AND SUSTAINED SPEEDS AND GUSTS MAY BOTH REACH
WIND ADVY CRITERIA. HAVE THUS POSTED AN ADVY FOR THOSE AREAS
THROUGH THURSDAY NOON. WHILE WINDS WILL BE STRONGEST THERE IN THE
SOUTH...THE TEMPS DO NOT DROP FAST ENOUGH TO GET WIND CHILLS BELOW
ADVY THE LINE OF -15F. WILL ISSUE AN ADVY FOR THE NW HALF AS THE
CRITERIA SHOULD EASILY BE MET. IF THE TIMING OF THE SNOW WERE TO
BE ENDING LATER THURS MORNING...WE MAY HAVE BEEN ABLE TO FORGO A
WIND CHILL ADVY AND JUST WRAP IT INTO THE WSW. BUT THE CHILLS WILL
LAST MUCH LONGER THAN THE ACCUMULATING SNOW...THROUGH THE ENTIRE
MORNING...WHEREAS THE SNOW SHOULD BE VIRTUALLY DONE BY 2 AM/06Z.
THURSDAY SHOULD BE ONE OF THE COLDEST WE HAVE SEEN YET THIS
WINTER. THIS IS EVEN MORE IMPRESSIVE GIVEN THE MID-MARCH TIMING.
8H TEMPS DROP INTO THE MINUS 20S C IN THE MORNING...BUT THIS
NASTINESS GETS DRAGGED THROUGH THE AREA RATHER QUICKLY DUE TO THE
SHARPNESS OF THE TROUGH AND PROGRESSIVE NATURE OF THE FLOW ALOFT.
LITTLE BREAKS IN THE CLOUDS OVER THE S/SE OVERNIGHT SHOULD LEAD
TO GREATER BREAKS IN THE MORNING OVER THE SRN TIER AND SERN AREAS
COULD CLEAR UP TOTALLY BY THE END OF THE MORNING. WILL PLAY IT
MORE-CLOUDY THAN THAT FOR NOW. EVEN WITH THE SUN AND
DOWNSLOPE...THE MAXES IN THE SE WILL ONLY BE IN THE M/U20S. THAT
WOULD BE WELCOME IN THE NRN TIER WHERE MAXES MAY NOT MAKE IT INTO
THE TWEENS /10-12F/.
THE GUSTY WINDS WILL GRADUALLY SUBSIDE DURING THE DAY THURS WITH
DAYTIME HIGHS 25-30F BELOW NORMAL. DAILY RECORD LOW/MINI-MAXES ARE
IN JEOPARDY. IN ADDITION...LOW TEMPS THURS MORNING ACRS WRN PA
WILL ALSO BE NEAR DAILY RECORD. SUFFICE IT TO SAY...IT MAY NOT BE
THIS COLD AGAIN /ESPECIALLY DURING THE DAYLIGHT HOURS/ UNTIL NEXT
WINTER.
&&
.LONG TERM /THURSDAY NIGHT THROUGH TUESDAY/...
THE GOOD NEWS IS THAT THE COLD BLAST WILL BE SHORT-LIVED...WITH A
RAPID MODERATION OCCURRING ON FRIDAY. BREEZY SW RETURN FLOW IN
ADVANCE OF NRN CLIPPER SFC LOW TRACKING ACRS THE UPPER GREAT LAKES
AND DOWNSLOPING SHOULD HELP TO BOOST TEMPS INTO THE 40S NORTH AND
50S SOUTH. THE MODELS TURN THE LOW TO THE NORTHEAST UP THE ST.
LAWRENCE VLY ON DAY 5/SAT...DRAGGING A TRAILING/WEAK COLD FRONT
ACRS THE NORTHEAST AND MID-ATL STATES. MODEL CONSENSUS INDICATES
SOME LGT PCPN IS POSSIBLE WITH CHC POPS AS THE FRONT SHIFTS SEWD
ACRS THE CWA.
GEFS/EC ENSEMBLE MEANS SHOW THE LARGE SCALE PATTERN REVERTING BACK
TO A WRN RIDGE/ERN TROUGH CONFIGURATION INTO EARLY NEXT WEEK. THIS
HAS BEEN THE FAVORED/PREVAILING FLOW REGIME THIS WINTER...WITH A
COLD POLAR VORTEX OVER EASTERN CANADA. A STRONG SFC HIGH PUSHING
SEWD FROM THE UPPER MS VLY SHOULD DIRECT COLDER AIR INTO THE REGION
BEHIND A REINFORCING FROPA ON SUNDAY...WITH TEMPS LKLY TRENDING
LOWER BY DAY 7/MON. THE NON-NCEP OPRNL MODELS /12Z CMC AND ECMWF/
ARE MORE BULLISH ON CYCLOGENESIS INVOF THE GULF STREAM JUST EAST
OF THE CAROLINAS...WITH THE NW EDGE OF POTNL PCPN SHIELD POSSIBLY
REACHING SRN/SERN PA ON ST. PATRICK`S DAY. CONFIDENCE IS LOW GIVEN
THE LARGE SPREAD BTWN THE GFS AND ECMWF/CMC. SOMETHING TO MONITOR
IN THE DAYS TO COME.
&&
.AVIATION /07Z WEDNESDAY THROUGH SUNDAY/...
AS NOTED BELOW...VFR CONDITIONS WILL PREVAIL FOR A WHILE
LONGER...MAIN AREA OF RAIN NORTH PA BORDER.
06Z TAFS SENT.
EARLIER DISCUSSION BELOW.
VFR CONDITIONS WILL CONTINUE THROUGH THE FIRST HALF OF THE
OVERNIGHT PERIOD.
SAT SHOWS LOW TO MID CLOUDS STREAMING THROUGH WITH CEILINGS AT
MOST TAF SITES. THESE WILL SLOWLY LOWER AS THE NIGHT CONTINUES AND
RESTRICTIONS WILL ARRIVE AS LIGHT RAIN /AND POSS SNOW NORTH/
AROUND 06Z IN THE NW...AND HEAVIER AREA OF PRECIP ARRIVING STARTING
AROUND 12Z WED. BULK OF HEAVIER PRECIPITATION WILL BE BETWEEN LATE
WED MORNING AND EARLY WEDNESDAY EVENING.
WIDESPREAD ADVERSE CONDITIONS ON WED...WITH RAIN ACROSS MUCH OF
THE AREA...SNOW ACROSS THE FAR NORTH...AND SOME RISK OF STRONG
TSTMS NEAR THE MD BORDER. BY AFTERNOON...STRONG WIND FIELDS WILL
BRING INCREASING NORTHERLY FLOW...LLWS...AND GUSTY WINDS UP TO 40
MPH. THESE CONTINUE THROUGH THE FIRST HALF OF THU AS VERY COLD AIR
STAMPEDES INTO PA. WITH STRONG STORM DYNAMICS...CONCERN EXISTS FOR
A BURST OF HEAVY WET CONVECTIVE SNOW /AND POSS THUNDER/ NEAR THE
CENTER OF THE LOW WED/WED NIGHT.
HAVE UPDATED TAFS WITH LLWS AT ALL CENTRAL AND WESTERN TAF SITES
FROM 16Z TO AROUND 22Z.
OUTLOOK...
WED...WIDESPREAD MVFR- IFR
RESTRICTIONS IN RAIN AND SNOW. STRONG N/NW WINDS DEVELOPING. LLWS.
THU...STRONG/GUSTY N/NW WINDS...GRADUALLY DIMINISHING IN THE
AFTERNOON. FRI-SUN...NO SIG WX EXPECTED.
&&
.HYDROLOGY...
WITH WARMER TEMPERATURES RAINFALL TODAY...WE EXPECT MODERATE
RISES ON RIVERS AND STREAMS. THERE IS STILL ENOUGH ICE IN SPOTS TO
LEAD TO ICE JAMS...THOUGH SIGNIFICANT DECAY HAS OCCURRED AT MANY
LOCATIONS DUE TO THE RECENTLY WARM WEATHER. ANY ICE JAMS WILL BE
ISOLATED IN NATURE. MONITOR WATER LEVELS CLOSELY FOR THE REST OF
THE WEEK.
&&
.CTP WATCHES/WARNINGS/ADVISORIES...
WINTER STORM WARNING FROM 8 AM THIS MORNING TO 8 AM EDT
THURSDAY FOR PAZ004-005.
WINTER WEATHER ADVISORY FROM 8 AM THIS MORNING TO 8 AM EDT
THURSDAY FOR PAZ006-010-011-037.
WINTER WEATHER ADVISORY FROM 3 PM THIS AFTERNOON TO 8 AM EDT
THURSDAY FOR PAZ017-024-033.
&&
$$
SYNOPSIS...DANGELO/LA CORTE
NEAR TERM...DANGELO
SHORT TERM...DANGELO
LONG TERM...STEINBUGL
AVIATION...CERU/MARTIN/RXR
HYDROLOGY...CTP
AREA FORECAST DISCUSSION
NWS GREENVILLE-SPARTANBURG SC
252 PM EDT WED MAR 12 2014
.SYNOPSIS...
COOL HIGH PRESSURE WILL BUILD IN TONIGHT AS A COLD FRONT PUSHES OFF
TO THE EAST. THE AIRMASS WILL SLOWLY MODERATE WARMER INTO
SATURDAY...BEFORE A BROAD AND COLDER UPPER LEVEL TROF BUILDS IN
SUNDAY THROUGH MONDAY.
&&
.NEAR TERM /THROUGH THURSDAY/...
AS OF 130 PM EDT...A LINE OF SHOWERS IS DEVELOPING AS EXPECTED OVER
ERN TN. CUT BACK SHOWER ACTIVITY CONSIDERABLY AHEAD OF THE LINE OVER
THE WESTERN CAROLINAS AND NE GA THIS AFTN...BUT HAVE STILL
MAINTAINED LIKELY POPS ALONG THE PROBABLE MCS TRACK WHICH WILL
PRIMARILY BE ACROSS NORTH CAROLINA.
AS OF 1110 AM...LOW CLOUDS ARE HOLDING ON A LITTLE LONGER THAN
EXPECTED OVER THE FOOTHILLS AND PIEDMONT OF THE WRN CAROLINAS AND NE
GA THIS MORNING. AND THE LATEST NAM HAS COME IN WITH IT/S GREATEST
INSTABILITY JUST A LITTLE EAST OF THE FORECAST AREA AROUND 21 UTC
THIS AFTN. THERE IS STILL A LINE FINE OVER ERN TN WHICH REPRESENTS
THE SFC COLD FRONT. CONVECTION IS SLOWLY STRENGTHENING ALONG THE NRN
PORTION OF THE LINE WHERE THERE IS GREATER FORCING...BUT THE
SOUTHERN END SHOULDN/T DEVELOP INTO DEEP CONVECTION UNTIL IT GETS
EAST OF THE MOUNTAINS. THE THINKING NOW IS THAT IT WILL STEADILY
STRENGTHEN ONCE EAST OF THE MOUNTAINS...BUT THAT THE GREATEST SEVERE
POTENTIAL WILL BE A LITTLE EAST OF THE FORECAST AREA. STILL...THE
I77 CORRIDOR IS THE AREA MOST UNDER THE GUN THIS AFTN IN OUR FA.
ALSO...WINDS IN THE BNDRY LAYER JUST BEHIND THE LINE ARE QUITE
STRONG...AND EVEN A RELATIVELY WEAK LINE OF SHOWERS HAS THE
POTENTIAL TO PRODUCE DAMAGING WINDS. OVER THE UPSTATE AND NE GA THE
ATMOSPHERE LOOKS MORE CAPPED...THOUGH DEWPOINTS WILL BE A LITTLE
HIGHER. OVERALL...THE HRRR TREND OF THE LINE OF CONVECTION NOT
DEVELOPING VERY FAR INTO THE UPSTATE LOOKS GOOD AND HAS BEEN
REFLECTED IN THE GRIDS. BUT EVEN HERE 40 KT GRADIENT WIND GUSTS ARE
POSSIBLE AND THE WIND ADVISORY STILL LOOKS VALID.
AS OF 630 AM...I WILL UPDATE THE FORECAST WITH THE RECENT
OBSERVATIONS ACROSS THE FORECAST AREA. IN ADDITION...I WILL INCREASE
POPS EARLY THIS MORNING...BASED OFF OF THE RECENT RADAR DATA. IN
ADDITION...I WILL ADD TIMING AND PLACEMENT DETAILS FOR A LINE OF
TSRA TO SWEEP ACROSS THE NRN I-77 CORRIDOR THIS AFTERNOON.
AS OF 415 AM...A VERY COMPLICATED WEATHER EVENT IN THE OFFING. THE
LATEST RADAR IMAGES INDICATED THAT WIDESPREAD LIGHT RAIN WAS
SPREADING NORTH ACROSS NE GA AND THE WESTERN CAROLINAS. NAM
INDICATES THAT 305-315K ISENTROPIC LIFT WILL INCREASE THROUGH
DAYBREAK...THEN BECOMES SCT DURING THE REST OF THE DAY. HOWEVER...A
FIELD OF MID LEVEL Q-VECTOR CONVERGENCE WILL SLIDE ACROSS THE
FORECAST AREA FROM MID DAY THROUGH SUNSET. I WILL INCREASE POPS TO
CATE ACROSS THE MTNS AND FOOTHILLS THROUGH MID DAY. A STRONG COLD
FRONT IS EXPECTED TO SWEEP WEST TO EAST BETWEEN 21-00Z. THE
STRONG...COLD...MOIST NW H85 WINDS WILL REMAIN ACROSS THE NC MTNS
THROUGH TONIGHT.
SOUTHWEST WINDS WILL INCREASE ACROSS THE CWA AHEAD OF THE
APPROACHING COLD FRONT. THIS AFTERNOON...WINDS ACROSS THE FOOTHILLS
AND PIEDMONT WILL INCREASE TO 20 TO 25KTS WITH GUSTS ABOVE 40 KTS
DURING THE LATE AFTERNOON AND EVENING. ACROSS THE MTNS...WINDS WILL
ALSO INCREASE SHARPLY DURING THE MID DAY. HOWEVER...BOTH THE NAM AND
GFS INDICATE THAT H85 WINDS WILL REACH 50-55 KTS BETWEEN 0-6Z. I
WILL HIGHLIGHT THE FOOTHILLS AND PIEDMONT WITH A WIND ADVISORY FROM
NOON THROUGH MIDNIGHT. ACROSS THE MTNS...THE ADVISORY WILL HIGHLIGHT
THE NOON TO 6 AM PERIOD. NRN MTN AREAS WILL SEE GUSTS AROUND
50KTS...HIGHLIGHT WITH A HIGH WIND WARNING FROM NOON TO 6 AM.
THE ENVIRONMENT ALONG AND AHEAD OF THE COLD FRONT WILL BE A HIGH
SHEAR AND LOW CAPE ENVIRONMENT. THE 0-1 KM HELICITY AHEAD OF THE
FRONT ARE FORECAST TO RANGE FROM 250-300 M2/S2. FORECAST SOUNDINGS
INDICATE A THIN LAYER OF CAPE BETWEEN 250-300 J/KG. THE GREATEST 0-3
KM EHI...APPROACHING .8 M2/S2...IS EXPECTED TO OCCUR ALONG AND EAST
OF THE I-77 CORRIDOR DURING THE LATE AFTERNOON. IN ADDITION...SHERB
VALUES WITHIN THE I-77 CORRIDOR IS FORECAST TO EXCEED 1 AROUND 21Z.
IT APPEARS THAT A QLCS SVR WIND EVENT MAY OCCUR ACROSS THE I-77
CORRIDOR LATE THIS AFTERNOON. THE SVR TSRA THREAT WILL BE
HIGHLIGHTED IN THE HWO.
TONIGHT...H85 TEMPERATURES WILL RAPIDLY COOL TO -10 TO -14 C ACROSS
THE TN BORDER COUNTIES. THE COMBINATION OF STRONG NW WINDS AND DEEP
MOISTURE SHOULD SUPPORT SHSN ALONG THE WESTERN SLOPES OF THE
SOUTHERN APPALACHIANS THROUGH TONIGHT. IN ADDITION...WEAK
INSTABILITY MAY LINGER WITHIN THE LLVL NW FLOW DURING THE MID
EVENING...SUPPORTING MOD SHSN. MIN TEMPERATURES ARE FORECAST TO
RANGE FROM THE TEENS TO THE L20S ACROSS THE MTNS...NEAR 30 EAST. THE
COLD TEMPERATURES SHOULD YIELD SNOW RATIOS AT LEAST 20 TO 1. EVENT
SNOWFALL ACROSS THE TN BORDER COUNTIES IS FORECAST TO RANGE FROM 2-3
INCHES...WILL HIGHLIGHT WITH A WINTER WEATHER ADVISORY.
&&
.SHORT TERM /THURSDAY NIGHT THROUGH SATURDAY/...
AS OF 230 PM WEDNESDAY...AS THE UPPER TROF MOVES FARTHER OFFSHORE
THURSDAY NIGHT...A FLAT UPPER RIDGE MOVING EAST WILL PROVIDE FOR
NEARLY ZONAL FLOW ALOFT THROUGH MOST OF THE PERIOD. THIS WILL CARRY
HIGH PRESSURE ACROSS THE CAROLINAS THURSDAY NIGHT AND OFF THE COAST
ON FRIDAY. THIS WILL ALLOW FOR TEMPS TO REBOUND NICELY TO SOMETHING
NEAR NORMAL FOR FRIDAY. WARM ADVECTION SHOULD KICK IN ON SATURDAY
THAT WILL RAISE TEMPS ANOTHER FEW DEGREES IN SPITE OF AN INCREASE IN
CLOUD COVER AND SHOWER CHANCES. THIS DEVELOPMENT WILL BE COURTESY OF
A WEAK WAVE MOVING THROUGH THE FLAT RIDGE ON SATURDAY...WHICH IS BY
NO MEANS CERTAIN. THE GFS IS MOST PRONOUNCED WITH THE SHORT WAVE ON
SATURDAY BUT IT REMAINS DISORGANIZED. HOWEVER...SOME UPPER
DIVERGENCE AND DPVA ACT ON DEEPENING MOISTURE TO DEVELOP PRECIP INTO
THE FCST AREA. MEANWHILE...THE NAM AND ECMWF BARELY SHOW ANY WAVE
FEATURE AND THAT IS REFLECTED IN A LACK OF FORCING AND RESPONSE AS
BOTH MODELS KEEP US DRY ON SATURDAY. THE FORECAST WILL KEEP A SMALL
POP DEVELOPING INTO SATURDAY AFTERNOON MOSTLY AS A LEGACY FROM THE
PREVIOUS FCST GIVEN THE NEW GFS WHICH STILL DEVELOPS PRECIP. THE
ONSET COULD BE EARLY ENOUGH FOR A BRIEF PERIOD OF HIGH ELEVATION
SNOW OVER THE SMOKIES AND BALSAMS...OTHERWISE IT SHOULD BE RAIN.
THIS COULD EASILY BE ELIMINATED IN SUBSEQUENT FCSTS.
&&
.LONG TERM /SATURDAY NIGHT THROUGH WEDNESDAY/...
AS OF 200 PM EDT WEDNESDAY...LATEST GLOBAL MODELS HAVE COME INTO
BETTER AGREEMENT ON TIMING AND TRACK OF A MILLER-A TYPE LOW MOVING
UP ALONG THE SE COAST LATE SUN INTO MONDAY.
MODELS AGREE THAT A WAVE OF LOW PRESSURE WILL DEVELOP ALONG A
SURFACE BOUNDARY OVER THE CENTRAL GULF COAST EARLY SUN AS A NORTHERN
STREAM UPPER ENERGY DIGS INTO THE LOWER MISSISSIPPI VALLEY. THIS LOW
WILL TRACK EASTWARD ACROSS SOUTHERN AL/GA SUN NIGHT AND MOVES OFF
THE SE COASTS BY 12Z MONDAY. POPS RAMP UP FROM WEST TO EAST THRU SUN
AS DEEP MOISTURE FLUX INCREASES AHEAD OF THE APPROACHING LOW. THE
BEST CHANCE OF PRECIP WILL OCCUR SUN NIGHT INTO EARLY MON AS THE LOW
MOVES SE OF THE AREA. LATEST MODELS INDICATE THAT THERMAL PROFILE
WILL CONSIDERABLY COOL OFF BY SUN NIGHT AS 1030+MB CANADIAN HIGH
PRESSURE BUILDS TO OUR NORTH...LEADING TO SOME P-TYPE ISSUE MAINLY
ACROSS THE NORTHERN ZONES OF THE CWA. USING A TOP-DOWN METHOD...I/VE
MENTIONED WINTRY MIX OVER THE NORTHERN NC MTNS AND PORTIONS OF OUR
NE ZONES SUN NIGHT INTO MON MORNING. ELSEWHERE WILL SEE A SOLID RAIN
EVENT. POPS TAPER OFF BY MON AFTERNOON AS THE LOW PULLS FURTHER NE
AWAY FROM THE REGION. EXPECT DRY WEATHER WITH MODERATING TEMPS MON
THRU WED AS HIGH PRESSURE CENTERED OFF THE EAST COAST BRINGS MOIST
RETURN FLOW TO THE REGION.
&&
.AVIATION /19Z WEDNESDAY THROUGH MONDAY/...
AT KCLT...THE CENTER OF 990 MB LOW WILL TRACK FROM THE OHIO RIVER VALLEY
TO THE NEW ENGLAND COAST THROUGH THE TAF PERIOD. LLVL LIFT AND DEEP
MOISTURE WILL SWEEP NORTH AHEAD OF APPROACHING COLD FRONT THIS
MORNING AND AFTERNOON. -SHRA WITH IFR CEILINGS IS EXPECTED DURING
THE EARLY MORNING DAYLIGHT HOURS. FROPA IS EXPECTED BETWEEN 22-02Z
ACROSS THE TERMINAL. AS THE FRONT APPROACHES...SW WILL STRENGTHEN
THROUGH THE AFTERNOON...WITH GUSTS NEAR 40 KTS. IN THE WAKE OF THE
FRONT...WIND WILL VEER FROM THE NW WITH GUSTS IN THE MID TO UPPER 30
KTS.
ELSEWHERE...IFR CEILINGS AND -SHRA WILL INCREASE AHEAD OF AN
APPROACHING COLD FRONT THIS MORNING. BY MID DAY...VFR CONDITIONS
WITH SW WINDS STRENGTHENING SIGNIFICANTLY...WITH GUSTS IN THE MID
TO UPPER 30 KTS. IN THE WAKE OF THE FRONT...WIND WILL VEER FROM THE
NW WITH GUSTS IN THE MID TO UPPER 30 KTS.
OUTLOOK...DRY HIGH PRESSURE WILL REMAIN OVER THE WESTERN CAROLINAS
THROUGH THE REMAINDER OF THE WORK WEEK.
CONFIDENCE TABLE...
19-01Z 01-07Z 07-13Z 13-19Z
KCLT HIGH 93% HIGH 100% HIGH 100% HIGH 100%
KGSP HIGH 100% HIGH 100% HIGH 100% HIGH 100%
KAVL MED 74% HIGH 100% HIGH 100% HIGH 100%
KHKY HIGH 95% HIGH 100% HIGH 100% HIGH 100%
KGMU HIGH 100% HIGH 100% HIGH 100% HIGH 100%
KAND HIGH 94% HIGH 100% HIGH 100% HIGH 100%
THE PERCENTAGE REFLECTS THE NUMBER OF GUIDANCE MEMBERS AGREEING
WITH THE SCHEDULED TAF ISSUANCE FLIGHT RULE CATEGORY. COMPLETE
HOURLY EXPERIMENTAL AVIATION FORECAST CONSISTENCY TABLES AND ENSEMBLE
FORECASTS ARE AVAILABLE AT THE FOLLOWING LINK: (MUST BE LOWER CASE)
WWW.WEATHER.GOV/GSP/AVIATION_TABLES
&&
.FIRE WEATHER...
ALTHO TEMPS WILL BE WELL BELOW NORMAL ON THURSDAY...THE AIR MASS
MOVING IN BEHIND THE FRONT TONIGHT WILL BE VERY DRY...SUCH THAT RH
SHOULD DROP WELL DOWN INTO THE TEENS EAST OF THE MTNS IN THE
AFTERNOON. PRECIPITATION TODAY WILL PROBABLY NOT AMOUNT TO ENOUGH TO
WET DOWN THE FUELS. THERE SHOULD BE ENOUGH RESIDUAL WIND GUSTINESS
TO RAISE THE POSSIBILITY OF DANGEROUS FIRE CONDITIONS THURSDAY
AFTERNOON. AFTER CONSULTATION WITH LAND MANAGERS...A FIRE WEATHER
WATCH WILL BE ISSUED FOR NC EAST OF THE MTNS. TEMPS WILL BE COOLER
OVER THE NC MTNS AND SOME LOCATIONS NEAR THE TN BORDER MIGHT BE SNOW
COVERED...SO NO WATCH THERE. ELSEWHERE...WIND WILL BE LIGHTER...BUT
ADDITIONAL COORDINATION WILL BE NEEDED ACROSS SOUTH CAROLINA AND NE
GEORGIA...FOR A POSSIBLE FIRE DANGER STATEMENT.
&&
.GSP WATCHES/WARNINGS/ADVISORIES...
GA...WIND ADVISORY UNTIL MIDNIGHT EDT TONIGHT FOR GAZ010-017-018-
026-028-029.
NC...FIRE WEATHER WATCH FROM THURSDAY MORNING THROUGH THURSDAY
AFTERNOON FOR NCZ035>037-056-057-068>072-082-501>510.
WIND ADVISORY UNTIL 6 AM EDT THURSDAY FOR NCZ048-051>053-058-
059-062>065-501-503-505-507-509.
WIND ADVISORY UNTIL MIDNIGHT EDT TONIGHT FOR NCZ035>037-056-
057-068>072-082-502-504-506-508-510.
WINTER WEATHER ADVISORY FROM 6 PM THIS EVENING TO 9 AM EDT
THURSDAY FOR NCZ033-048>052-058.
WIND CHILL ADVISORY FROM 6 PM THIS EVENING TO 9 AM EDT
THURSDAY FOR NCZ033-048>052-058.
HIGH WIND WARNING UNTIL 6 AM EDT THURSDAY FOR NCZ033-049-050.
SC...WIND ADVISORY UNTIL MIDNIGHT EDT TONIGHT FOR SCZ001>014-019.
&&
$$
SYNOPSIS...JOH
NEAR TERM...MCAVOY
SHORT TERM...PM
LONG TERM...JOH
AVIATION...MCAVOY
FIRE WEATHER...
AREA FORECAST DISCUSSION
NWS GREENVILLE-SPARTANBURG SC
140 PM EDT WED MAR 12 2014
.SYNOPSIS...
A COLD FRONT WILL PUSH THROUGH THE FORECAST AREA TODAY WITH COOL
HIGH PRESSURE BUILDING IN ON THURSDAY. THE AIRMASS WILL SLOWLY
MODERATE WARMER INTO SATURDAY...BEFORE A BROAD AND COLDER UPPER
LEVEL TROF BUILDS IN SUNDAY THROUGH MONDAY.
&&
.NEAR TERM /THROUGH TONIGHT/...
AS OF 130 PM EDT...A LINE OF SHOWERS IS DEVELOPING AS EXPECTED OVER
ERN TN. CUT BACK SHOWER ACTIVITY CONSIDERABLY AHEAD OF THE LINE OVER
THE WESTERN CAROLINAS AND NE GA THIS AFTN...BUT HAVE STILL
MAINTAINED LIKELY POPS ALONG THE PROBABLE MCS TRACK WHICH WILL
PRIMARILY BE ACROSS NORTH CAROLINA.
AS OF 1110 AM...LOW CLOUDS ARE HOLDING ON A LITTLE LONGER THAN
EXPECTED OVER THE FOOTHILLS AND PIEDMONT OF THE WRN CAROLINAS AND NE
GA THIS MORNING. AND THE LATEST NAM HAS COME IN WITH IT/S GREATEST
INSTABILITY JUST A LITTLE EAST OF THE FORECAST AREA AROUND 21 UTC
THIS AFTN. THERE IS STILL A LINE FINE OVER ERN TN WHICH REPRESENTS
THE SFC COLD FRONT. CONVECTION IS SLOWLY STRENGTHENING ALONG THE NRN
PORTION OF THE LINE WHERE THERE IS GREATER FORCING...BUT THE
SOUTHERN END SHOULDN/T DEVELOP INTO DEEP CONVECTION UNTIL IT GETS
EAST OF THE MOUNTAINS. THE THINKING NOW IS THAT IT WILL STEADILY
STRENGTHEN ONCE EAST OF THE MOUNTAINS...BUT THAT THE GREATEST SEVERE
POTENTIAL WILL BE A LITTLE EAST OF THE FORECAST AREA. STILL...THE
I77 CORRIDOR IS THE AREA MOST UNDER THE GUN THIS AFTN IN OUR FA.
ALSO...WINDS IN THE BNDRY LAYER JUST BEHIND THE LINE ARE QUITE
STRONG...AND EVEN A RELATIVELY WEAK LINE OF SHOWERS HAS THE
POTENTIAL TO PRODUCE DAMAGING WINDS. OVER THE UPSTATE AND NE GA THE
ATMOSPHERE LOOKS MORE CAPPED...THOUGH DEWPOINTS WILL BE A LITTLE
HIGHER. OVERALL...THE HRRR TREND OF THE LINE OF CONVECTION NOT
DEVELOPING VERY FAR INTO THE UPSTATE LOOKS GOOD AND HAS BEEN
REFLECTED IN THE GRIDS. BUT EVEN HERE 40 KT GRADIENT WIND GUSTS ARE
POSSIBLE AND THE WIND ADVISORY STILL LOOKS VALID.
AS OF 630 AM...I WILL UPDATE THE FORECAST WITH THE RECENT
OBSERVATIONS ACROSS THE FORECAST AREA. IN ADDITION...I WILL INCREASE
POPS EARLY THIS MORNING...BASED OFF OF THE RECENT RADAR DATA. IN
ADDITION...I WILL ADD TIMING AND PLACEMENT DETAILS FOR A LINE OF
TSRA TO SWEEP ACROSS THE NRN I-77 CORRIDOR THIS AFTERNOON.
AS OF 415 AM...A VERY COMPLICATED WEATHER EVENT IN THE OFFING. THE
LATEST RADAR IMAGES INDICATED THAT WIDESPREAD LIGHT RAIN WAS
SPREADING NORTH ACROSS NE GA AND THE WESTERN CAROLINAS. NAM
INDICATES THAT 305-315K ISENTROPIC LIFT WILL INCREASE THROUGH
DAYBREAK...THEN BECOMES SCT DURING THE REST OF THE DAY. HOWEVER...A
FIELD OF MID LEVEL Q-VECTOR CONVERGENCE WILL SLIDE ACROSS THE
FORECAST AREA FROM MID DAY THROUGH SUNSET. I WILL INCREASE POPS TO
CATE ACROSS THE MTNS AND FOOTHILLS THROUGH MID DAY. A STRONG COLD
FRONT IS EXPECTED TO SWEEP WEST TO EAST BETWEEN 21-00Z. THE
STRONG...COLD...MOIST NW H85 WINDS WILL REMAIN ACROSS THE NC MTNS
THROUGH TONIGHT.
SOUTHWEST WINDS WILL INCREASE ACROSS THE CWA AHEAD OF THE
APPROACHING COLD FRONT. THIS AFTERNOON...WINDS ACROSS THE FOOTHILLS
AND PIEDMONT WILL INCREASE TO 20 TO 25KTS WITH GUSTS ABOVE 40 KTS
DURING THE LATE AFTERNOON AND EVENING. ACROSS THE MTNS...WINDS WILL
ALSO INCREASE SHARPLY DURING THE MID DAY. HOWEVER...BOTH THE NAM AND
GFS INDICATE THAT H85 WINDS WILL REACH 50-55 KTS BETWEEN 0-6Z. I
WILL HIGHLIGHT THE FOOTHILLS AND PIEDMONT WITH A WIND ADVISORY FROM
NOON THROUGH MIDNIGHT. ACROSS THE MTNS...THE ADVISORY WILL HIGHLIGHT
THE NOON TO 6 AM PERIOD. NRN MTN AREAS WILL SEE GUSTS AROUND
50KTS...HIGHLIGHT WITH A HIGH WIND WARNING FROM NOON TO 6 AM.
THE ENVIRONMENT ALONG AND AHEAD OF THE COLD FRONT WILL BE A HIGH
SHEAR AND LOW CAPE ENVIRONMENT. THE 0-1 KM HELICITY AHEAD OF THE
FRONT ARE FORECAST TO RANGE FROM 250-300 M2/S2. FORECAST SOUNDINGS
INDICATE A THIN LAYER OF CAPE BETWEEN 250-300 J/KG. THE GREATEST 0-3
KM EHI...APPROACHING .8 M2/S2...IS EXPECTED TO OCCUR ALONG AND EAST
OF THE I-77 CORRIDOR DURING THE LATE AFTERNOON. IN ADDITION...SHERB
VALUES WITHIN THE I-77 CORRIDOR IS FORECAST TO EXCEED 1 AROUND 21Z.
IT APPEARS THAT A QLCS SVR WIND EVENT MAY OCCUR ACROSS THE I-77
CORRIDOR LATE THIS AFTERNOON. THE SVR TSRA THREAT WILL BE
HIGHLIGHTED IN THE HWO.
TONIGHT...H85 TEMPERATURES WILL RAPIDLY COOL TO -10 TO -14 C ACROSS
THE TN BORDER COUNTIES. THE COMBINATION OF STRONG NW WINDS AND DEEP
MOISTURE SHOULD SUPPORT SHSN ALONG THE WESTERN SLOPES OF THE
SOUTHERN APPALACHIANS THROUGH TONIGHT. IN ADDITION...WEAK
INSTABILITY MAY LINGER WITHIN THE LLVL NW FLOW DURING THE MID
EVENING...SUPPORTING MOD SHSN. MIN TEMPERATURES ARE FORECAST TO
RANGE FROM THE TEENS TO THE L20S ACROSS THE MTNS...NEAR 30 EAST. THE
COLD TEMPERATURES SHOULD YIELD SNOW RATIOS AT LEAST 20 TO 1. EVENT
SNOWFALL ACROSS THE TN BORDER COUNTIES IS FORECAST TO RANGE FROM 2-3
INCHES...WILL HIGHLIGHT WITH A WINTER WEATHER ADVISORY.
&&
.SHORT TERM /THURSDAY THROUGH FRIDAY NIGHT/...
AS OF 330 AM WEDNESDAY...STRONG CHANNELED SHORT WAVE CROSSES THE
AREA THURSDAY AS AN UPPER TROF MOVES EAST OF THE AREA. ANY LINGERING
MTN SNOW SHOWERS WILL DISSIPATE QUICKLY THU MORNING AS LOW LEVEL
DRIES UP. TIGHT PRESSURE GRADIENT WILL RELAX THRU THE DAY AS HIGH
PRESSURE BUILDS INTO THE AREA. HOWEVER...GUSTY WINDS COULD LINGER
THROUGH THE MORNING. VERY LOW RH IS LIKELY AS THE AIR MASS MOVING
INTO THE AREA IS VERY DRY. THERE IS SOME CONCERN ON THURSDAY THAT
PORTIONS OF THE FCST AREA WILL FLIRT WITH RED FLAG FIRE CONDITIONS
BECAUSE OF THE VERY LOW RH IN THE AFTERNOON AND POTENTIALLY
LINGERING WIND GUSTS OVER THE MTNS. EXPECT HIGHS 10 TO 15 DEGREES
BELOW NORMAL.
ZONAL FLOW DEVELOPS THU NITE AND CONTINUES FRI AND FRI NITE. SOME
WEAK SHORT WAVES MOVE ACROSS THE AREA THRU THE ZONAL FLOW. AT THE
SFC...THE HIGH PRESSURE CENTER MOVES OVER THE AREA THU NITE THEN OFF
SHORE FRI. A WEAK FRONTAL SYSTEM DROPS INTO THE OH VALLEY FRI NITE
AS A LOW PRESSURE CENTER MOVES INTO THE SRN PLAINS. MOISTURE RETURNS
ACROSS THE AREA IN THE DEVELOPING SLY FLOW AS THE HIGH MOVES OFF
SHORE. EXPECT MAINLY CLOUDS FROM THIS RETURN MOISTURE. PRECIP SHOULD
HOLD OFF UNTIL AFTER FRI NITE. HIGHS FRI WILL RISE TO NEAR NORMAL.
LOWS THU NITE AROUND 10 DEGREES BELOW NORMAL WILL RISE A LITTLE
ABOVE NORMAL FRI NITE.
&&
.LONG TERM /SATURDAY THROUGH TUESDAY/...
AS OF 145 AM EDT WED...THERE IS STILL MUCH UNCERTAINTY IN THE EXT
RANGE FCST. THE ULVL PATTERN/ENERGY AND MASS FIELDS ARE NOT WELL
AGREED UPON WHICH LEADS TO VARYING SFC SENSIBLE WX SOLNS BTW THE
MAIN OP MODELS. THE INCOMING COLD FRONT SAT IS MORE PRONOUNCED AND
HAS GREATER GOM MOISTURE FLUX THAN THE CWC/ECMWF. HOWEVER...THERE IS
DECENT AGREEMENT WITH THE LLVL THERMAL FIELDS AND WILL COUNT ON
MAINLY ALL RAIN IN ISENT WARM SECTOR LIFT. THERE COULD BE BRIEF
-SNSH ACROSS THE HIGHEST NC MTN TERRAIN WITH NO SIGFNT ACCUMS
THROUGH 14Z SAT.
THE BIGGER DIFFERENCE IN THE MODELS OCCURS SUN THROUGH TUE WITH THE
EVOLUTION OF THE AFOREMENTIONED SFC BOUNDARY. WHILE THE GFS IS
MAINTAINING NEARLY UNIFORM FLOW THROUGH A DEEP LAYER AND THUS A
NEARLY STATIONARY COASTAL SFC FRONT...THE ECMWF AND CMC DEVELOP A
STRONG ULVL TROF AND COASTAL MILLER/A CYCLOGENESIS SUN NIGHT. THIS
LATTER SCENARIO WOULD BRING IN MUCH GREATER MOISTURE AND ALONG WITH
SOME MEASURE OF LOWERING PARTIAL THICKNESSES AND DIURNAL
COOLING...SN OR A RA/SN MIX SUN AND MON NIGHTS. THIS IDEA WAS GIVEN
A LITTLE MORE WEIGHT THAN THE TOTALLY SUPPRESSED AND DRY GFS SOLN.
THE GOING MID CHANCE POPS STILL LOOK GOOD SUN NIGHT THROUGH MON
NIGHT WITH SNOW ACCUMS ACROSS THE NC MTNS EARLY MON AND PERHAPS LOW
END ACCUMULATING SNOW INTO THE NC FOOTHILLS AND PIEDMONT MON NIGHT.
TEMPS WILL BEGIN THE PERIOD RIGHT AROUND NORMAL AND LIKELY DROP TO
8-10 DEGREES BELOW NORMAL BY MON WITH WINDS SHIFTING NE/LY AS A
CANADIAN HIGH BUILDS TO THE NORTH AND A BROAD ULVL TROF DEVELOPS
OVER THE ERN CONUS.
&&
.AVIATION /18Z WEDNESDAY THROUGH MONDAY/...
AT KCLT...THE CENTER OF 990 MB LOW WILL TRACK FROM THE OHIO RIVER VALLEY
TO THE NEW ENGLAND COAST THROUGH THE TAF PERIOD. LLVL LIFT AND DEEP
MOISTURE WILL SWEEP NORTH AHEAD OF APPROACHING COLD FRONT THIS
MORNING AND AFTERNOON. -SHRA WITH IFR CEILINGS IS EXPECTED DURING
THE EARLY MORNING DAYLIGHT HOURS. FROPA IS EXPECTED BETWEEN 22-02Z
ACROSS THE TERMINAL. AS THE FRONT APPROACHES...SW WILL STRENGTHEN
THROUGH THE AFTERNOON...WITH GUSTS NEAR 40 KTS. IN THE WAKE OF THE
FRONT...WIND WILL VEER FROM THE NW WITH GUSTS IN THE MID TO UPPER 30
KTS.
ELSEWHERE...IFR CEILINGS AND -SHRA WILL INCREASE AHEAD OF AN
APPROACHING COLD FRONT THIS MORNING. BY MID DAY...VFR CONDITIONS
WITH SW WINDS STRENGTHENING SIGNIFICANTLY...WITH GUSTS IN THE MID
TO UPPER 30 KTS. IN THE WAKE OF THE FRONT...WIND WILL VEER FROM THE
NW WITH GUSTS IN THE MID TO UPPER 30 KTS.
OUTLOOK...DRY HIGH PRESSURE WILL REMAIN OVER THE WESTERN CAROLINAS
THROUGH THE REMAINDER OF THE WORK WEEK.
CONFIDENCE TABLE...
17-23Z 23-05Z 05-11Z 11-17Z
KCLT HIGH 84% HIGH 100% HIGH 100% HIGH 100%
KGSP HIGH 96% HIGH 100% HIGH 100% HIGH 100%
KAVL MED 61% HIGH 100% HIGH 100% HIGH 100%
KHKY HIGH 87% HIGH 100% HIGH 100% HIGH 100%
KGMU HIGH 94% HIGH 100% HIGH 100% HIGH 100%
KAND HIGH 86% HIGH 100% HIGH 100% HIGH 100%
THE PERCENTAGE REFLECTS THE NUMBER OF GUIDANCE MEMBERS AGREEING
WITH THE SCHEDULED TAF ISSUANCE FLIGHT RULE CATEGORY. COMPLETE
HOURLY EXPERIMENTAL AVIATION FORECAST CONSISTENCY TABLES AND ENSEMBLE
FORECASTS ARE AVAILABLE AT THE FOLLOWING LINK: (MUST BE LOWER CASE)
WWW.WEATHER.GOV/GSP/AVIATION_TABLES
&&
.GSP WATCHES/WARNINGS/ADVISORIES...
GA...WIND ADVISORY UNTIL MIDNIGHT EDT TONIGHT FOR GAZ010-017-018-
026-028-029.
NC...WIND ADVISORY UNTIL 6 AM EDT THURSDAY FOR NCZ048-051>053-058-
059-062>065-501-503-505-507-509.
WIND ADVISORY UNTIL MIDNIGHT EDT TONIGHT FOR NCZ035>037-056-
057-068>072-082-502-504-506-508-510.
WINTER WEATHER ADVISORY FROM 6 PM THIS EVENING TO 6 AM EDT
THURSDAY FOR NCZ033-048>052-058.
HIGH WIND WARNING UNTIL 6 AM EDT THURSDAY FOR NCZ033-049-050.
SC...WIND ADVISORY UNTIL MIDNIGHT EDT TONIGHT FOR SCZ001>014-019.
&&
$$
SYNOPSIS...SBK
NEAR TERM...MCAVOY/NED
SHORT TERM...RWH
LONG TERM...SBK
AVIATION...MCAVOY
AREA FORECAST DISCUSSION
NWS GREENVILLE-SPARTANBURG SC
1113 AM EDT WED MAR 12 2014
.SYNOPSIS...
A COLD FRONT WILL PUSH THROUGH THE FORECAST AREA TODAY WITH COOL
HIGH PRESSURE BUILDING IN ON THURSDAY. THE AIRMASS WILL SLOWLY
MODERATE WARMER INTO SATURDAY...BEFORE A BROAD AND COLDER UPPER
LEVEL TROF BUILDS IN SUNDAY THROUGH MONDAY.
&&
.NEAR TERM /THROUGH TONIGHT/...
AS OF 1110 AM...LOW CLOUDS ARE HOLDING ON A LITTLE LONGER THAN
EXPECTED OVER THE FOOTHILLS AND PIEDMONT OF THE WRN CAROLINAS AND NE
GA THIS MORNING. AND THE LATEST NAM HAS COME IN WITH IT/S GREATEST
INSTABILITY JUST A LITTLE EAST OF THE FORECAST AREA AROUND 21 UTC
THIS AFTN. THERE IS STILL A LINE FINE OVER ERN TN WHICH REPRESENTS
THE SFC COLD FRONT. CONVECTION IS SLOWLY STRENGTHENING ALONG THE NRN
PORTION OF THE LINE WHERE THERE IS GREATER FORCING...BUT THE
SOUTHERN END SHOULDN/T DEVELOP INTO DEEP CONVECTION UNTIL IT GETS
EAST OF THE MOUNTAINS. THE THINKING NOW IS THAT IT WILL STEADILY
STRENGTHEN ONCE EAST OF THE MOUNTAINS...BUT THAT THE GREATEST SEVERE
POTENTIAL WILL BE A LITTLE EAST OF THE FORECAST AREA. STILL...THE
I77 CORRIDOR IS THE AREA MOST UNDER THE GUN THIS AFTN IN OUR FA.
ALSO...WINDS IN THE BNDRY LAYER JUST BEHIND THE LINE ARE QUITE
STRONG...AND EVEN A RELATIVELY WEAK LINE OF SHOWERS HAS THE
POTENTIAL TO PRODUCE DAMAGING WINDS. OVER THE UPSTATE AND NE GA THE
ATMOSPHERE LOOKS MORE CAPPED...THOUGH DEWPOINTS WILL BE A LITTLE
HIGHER. OVERALL...THE HRRR TREND OF THE LINE OF CONVECTION NOT
DEVELOPING VERY FAR INTO THE UPSTATE LOOKS GOOD AND HAS BEEN
REFLECTED IN THE GRIDS. BUT EVEN HERE 40 KT GRADIENT WIND GUSTS ARE
POSSIBLE AND THE WIND ADVISORY STILL LOOKS VALID.
AS OF 630 AM...I WILL UPDATE THE FORECAST WITH THE RECENT
OBSERVATIONS ACROSS THE FORECAST AREA. IN ADDITION...I WILL INCREASE
POPS EARLY THIS MORNING...BASED OFF OF THE RECENT RADAR DATA. IN
ADDITION...I WILL ADD TIMING AND PLACEMENT DETAILS FOR A LINE OF
TSRA TO SWEEP ACROSS THE NRN I-77 CORRIDOR THIS AFTERNOON.
AS OF 415 AM...A VERY COMPLICATED WEATHER EVENT IN THE OFFING. THE
LATEST RADAR IMAGES INDICATED THAT WIDESPREAD LIGHT RAIN WAS
SPREADING NORTH ACROSS NE GA AND THE WESTERN CAROLINAS. NAM
INDICATES THAT 305-315K ISENTROPIC LIFT WILL INCREASE THROUGH
DAYBREAK...THEN BECOMES SCT DURING THE REST OF THE DAY. HOWEVER...A
FIELD OF MID LEVEL Q-VECTOR CONVERGENCE WILL SLIDE ACROSS THE
FORECAST AREA FROM MID DAY THROUGH SUNSET. I WILL INCREASE POPS TO
CATE ACROSS THE MTNS AND FOOTHILLS THROUGH MID DAY. A STRONG COLD
FRONT IS EXPECTED TO SWEEP WEST TO EAST BETWEEN 21-00Z. THE
STRONG...COLD...MOIST NW H85 WINDS WILL REMAIN ACROSS THE NC MTNS
THROUGH TONIGHT.
SOUTHWEST WINDS WILL INCREASE ACROSS THE CWA AHEAD OF THE
APPROACHING COLD FRONT. THIS AFTERNOON...WINDS ACROSS THE FOOTHILLS
AND PIEDMONT WILL INCREASE TO 20 TO 25KTS WITH GUSTS ABOVE 40 KTS
DURING THE LATE AFTERNOON AND EVENING. ACROSS THE MTNS...WINDS WILL
ALSO INCREASE SHARPLY DURING THE MID DAY. HOWEVER...BOTH THE NAM AND
GFS INDICATE THAT H85 WINDS WILL REACH 50-55 KTS BETWEEN 0-6Z. I
WILL HIGHLIGHT THE FOOTHILLS AND PIEDMONT WITH A WIND ADVISORY FROM
NOON THROUGH MIDNIGHT. ACROSS THE MTNS...THE ADVISORY WILL HIGHLIGHT
THE NOON TO 6 AM PERIOD. NRN MTN AREAS WILL SEE GUSTS AROUND
50KTS...HIGHLIGHT WITH A HIGH WIND WARNING FROM NOON TO 6 AM.
THE ENVIRONMENT ALONG AND AHEAD OF THE COLD FRONT WILL BE A HIGH
SHEAR AND LOW CAPE ENVIRONMENT. THE 0-1 KM HELICITY AHEAD OF THE
FRONT ARE FORECAST TO RANGE FROM 250-300 M2/S2. FORECAST SOUNDINGS
INDICATE A THIN LAYER OF CAPE BETWEEN 250-300 J/KG. THE GREATEST 0-3
KM EHI...APPROACHING .8 M2/S2...IS EXPECTED TO OCCUR ALONG AND EAST
OF THE I-77 CORRIDOR DURING THE LATE AFTERNOON. IN ADDITION...SHERB
VALUES WITHIN THE I-77 CORRIDOR IS FORECAST TO EXCEED 1 AROUND 21Z.
IT APPEARS THAT A QLCS SVR WIND EVENT MAY OCCUR ACROSS THE I-77
CORRIDOR LATE THIS AFTERNOON. THE SVR TSRA THREAT WILL BE
HIGHLIGHTED IN THE HWO.
TONIGHT...H85 TEMPERATURES WILL RAPIDLY COOL TO -10 TO -14 C ACROSS
THE TN BORDER COUNTIES. THE COMBINATION OF STRONG NW WINDS AND DEEP
MOISTURE SHOULD SUPPORT SHSN ALONG THE WESTERN SLOPES OF THE
SOUTHERN APPALACHIANS THROUGH TONIGHT. IN ADDITION...WEAK
INSTABILITY MAY LINGER WITHIN THE LLVL NW FLOW DURING THE MID
EVENING...SUPPORTING MOD SHSN. MIN TEMPERATURES ARE FORECAST TO
RANGE FROM THE TEENS TO THE L20S ACROSS THE MTNS...NEAR 30 EAST. THE
COLD TEMPERATURES SHOULD YIELD SNOW RATIOS AT LEAST 20 TO 1. EVENT
SNOWFALL ACROSS THE TN BORDER COUNTIES IS FORECAST TO RANGE FROM 2-3
INCHES...WILL HIGHLIGHT WITH A WINTER WEATHER ADVISORY.
&&
.SHORT TERM /THURSDAY THROUGH FRIDAY NIGHT/...
AS OF 330 AM WEDNESDAY...STRONG CHANNELED SHORT WAVE CROSSES THE
AREA THURSDAY AS AN UPPER TROF MOVES EAST OF THE AREA. ANY LINGERING
MTN SNOW SHOWERS WILL DISSIPATE QUICKLY THU MORNING AS LOW LEVEL
DRIES UP. TIGHT PRESSURE GRADIENT WILL RELAX THRU THE DAY AS HIGH
PRESSURE BUILDS INTO THE AREA. HOWEVER...GUSTY WINDS COULD LINGER
THROUGH THE MORNING. VERY LOW RH IS LIKELY AS THE AIR MASS MOVING
INTO THE AREA IS VERY DRY. THERE IS SOME CONCERN ON THURSDAY THAT
PORTIONS OF THE FCST AREA WILL FLIRT WITH RED FLAG FIRE CONDITIONS
BECAUSE OF THE VERY LOW RH IN THE AFTERNOON AND POTENTIALLY
LINGERING WIND GUSTS OVER THE MTNS. EXPECT HIGHS 10 TO 15 DEGREES
BELOW NORMAL.
ZONAL FLOW DEVELOPS THU NITE AND CONTINUES FRI AND FRI NITE. SOME
WEAK SHORT WAVES MOVE ACROSS THE AREA THRU THE ZONAL FLOW. AT THE
SFC...THE HIGH PRESSURE CENTER MOVES OVER THE AREA THU NITE THEN OFF
SHORE FRI. A WEAK FRONTAL SYSTEM DROPS INTO THE OH VALLEY FRI NITE
AS A LOW PRESSURE CENTER MOVES INTO THE SRN PLAINS. MOISTURE RETURNS
ACROSS THE AREA IN THE DEVELOPING SLY FLOW AS THE HIGH MOVES OFF
SHORE. EXPECT MAINLY CLOUDS FROM THIS RETURN MOISTURE. PRECIP SHOULD
HOLD OFF UNTIL AFTER FRI NITE. HIGHS FRI WILL RISE TO NEAR NORMAL.
LOWS THU NITE AROUND 10 DEGREES BELOW NORMAL WILL RISE A LITTLE
ABOVE NORMAL FRI NITE.
&&
.LONG TERM /SATURDAY THROUGH TUESDAY/...
AS OF 145 AM EDT WED...THERE IS STILL MUCH UNCERTAINTY IN THE EXT
RANGE FCST. THE ULVL PATTERN/ENERGY AND MASS FIELDS ARE NOT WELL
AGREED UPON WHICH LEADS TO VARYING SFC SENSIBLE WX SOLNS BTW THE
MAIN OP MODELS. THE INCOMING COLD FRONT SAT IS MORE PRONOUNCED AND
HAS GREATER GOM MOISTURE FLUX THAN THE CWC/ECMWF. HOWEVER...THERE IS
DECENT AGREEMENT WITH THE LLVL THERMAL FIELDS AND WILL COUNT ON
MAINLY ALL RAIN IN ISENT WARM SECTOR LIFT. THERE COULD BE BRIEF
-SNSH ACROSS THE HIGHEST NC MTN TERRAIN WITH NO SIGFNT ACCUMS
THROUGH 14Z SAT.
THE BIGGER DIFFERENCE IN THE MODELS OCCURS SUN THROUGH TUE WITH THE
EVOLUTION OF THE AFOREMENTIONED SFC BOUNDARY. WHILE THE GFS IS
MAINTAINING NEARLY UNIFORM FLOW THROUGH A DEEP LAYER AND THUS A
NEARLY STATIONARY COASTAL SFC FRONT...THE ECMWF AND CMC DEVELOP A
STRONG ULVL TROF AND COASTAL MILLER/A CYCLOGENESIS SUN NIGHT. THIS
LATTER SCENARIO WOULD BRING IN MUCH GREATER MOISTURE AND ALONG WITH
SOME MEASURE OF LOWERING PARTIAL THICKNESSES AND DIURNAL
COOLING...SN OR A RA/SN MIX SUN AND MON NIGHTS. THIS IDEA WAS GIVEN
A LITTLE MORE WEIGHT THAN THE TOTALLY SUPPRESSED AND DRY GFS SOLN.
THE GOING MID CHANCE POPS STILL LOOK GOOD SUN NIGHT THROUGH MON
NIGHT WITH SNOW ACCUMS ACROSS THE NC MTNS EARLY MON AND PERHAPS LOW
END ACCUMULATING SNOW INTO THE NC FOOTHILLS AND PIEDMONT MON NIGHT.
TEMPS WILL BEGIN THE PERIOD RIGHT AROUND NORMAL AND LIKELY DROP TO
8-10 DEGREES BELOW NORMAL BY MON WITH WINDS SHIFTING NE/LY AS A
CANADIAN HIGH BUILDS TO THE NORTH AND A BROAD ULVL TROF DEVELOPS
OVER THE ERN CONUS.
&&
.AVIATION /15Z WEDNESDAY THROUGH SUNDAY/...
AT KCLT...THE CENTER OF 990 MB LOW WILL TRACK FROM THE OHIO RIVER VALLEY
TO THE NEW ENGLAND COAST THROUGH THE TAF PERIOD. LLVL LIFT AND DEEP
MOISTURE WILL SWEEP NORTH AHEAD OF APPROACHING COLD FRONT THIS
MORNING AND AFTERNOON. -SHRA WITH IFR CEILINGS IS EXPECTED DURING
THE EARLY MORNING DAYLIGHT HOURS. FROPA IS EXPECTED BETWEEN 22-02Z
ACROSS THE TERMINAL. AS THE FRONT APPROACHES...SW WILL STRENGTHEN
THROUGH THE AFTERNOON...WITH GUSTS NEAR 40 KTS. IN THE WAKE OF THE
FRONT...WIND WILL VEER FROM THE NW WITH GUSTS IN THE MID TO UPPER 30
KTS.
ELSEWHERE...IFR CEILINGS AND -SHRA WILL INCREASE AHEAD OF AN
APPROACHING COLD FRONT THIS MORNING. BY MID DAY...VFR CONDITIONS
WITH SW WINDS STRENGTHENING SIGNIFICANTLY...WITH GUSTS IN THE MID
TO UPPER 30 KTS. IN THE WAKE OF THE FRONT...WIND WILL VEER FROM THE
NW WITH GUSTS IN THE MID TO UPPER 30 KTS.
OUTLOOK...DRY HIGH PRESSURE WILL REMAIN OVER THE WESTERN CAROLINAS
THROUGH THE REMAINDER OF THE WORK WEEK.
CONFIDENCE TABLE...
15-21Z 21-03Z 03-09Z 09-15Z
KCLT MED 77% HIGH 100% HIGH 100% HIGH 100%
KGSP HIGH 87% HIGH 100% HIGH 100% HIGH 100%
KAVL LOW 58% HIGH 88% HIGH 100% HIGH 100%
KHKY HIGH 82% HIGH 100% HIGH 100% HIGH 100%
KGMU HIGH 86% HIGH 100% HIGH 100% HIGH 100%
KAND MED 65% HIGH 100% HIGH 100% HIGH 100%
THE PERCENTAGE REFLECTS THE NUMBER OF GUIDANCE MEMBERS AGREEING
WITH THE SCHEDULED TAF ISSUANCE FLIGHT RULE CATEGORY. COMPLETE
HOURLY EXPERIMENTAL AVIATION FORECAST CONSISTENCY TABLES AND ENSEMBLE
FORECASTS ARE AVAILABLE AT THE FOLLOWING LINK: (MUST BE LOWER CASE)
WWW.WEATHER.GOV/GSP/AVIATION_TABLES
&&
.GSP WATCHES/WARNINGS/ADVISORIES...
GA...WIND ADVISORY UNTIL MIDNIGHT EDT TONIGHT FOR GAZ010-017-018-
026-028-029.
NC...WIND ADVISORY UNTIL 6 AM EDT THURSDAY FOR NCZ048-051>053-058-
059-062>065-501-503-505-507-509.
WIND ADVISORY UNTIL MIDNIGHT EDT TONIGHT FOR NCZ035>037-056-
057-068>072-082-502-504-506-508-510.
WINTER WEATHER ADVISORY FROM 6 PM THIS EVENING TO 6 AM EDT
THURSDAY FOR NCZ033-048>052-058.
HIGH WIND WARNING UNTIL 6 AM EDT THURSDAY FOR NCZ033-049-050.
SC...WIND ADVISORY UNTIL MIDNIGHT EDT TONIGHT FOR SCZ001>014-019.
&&
$$
SYNOPSIS...SBK
NEAR TERM...MCAVOY/NED
SHORT TERM...RWH
LONG TERM...SBK
AVIATION...NED
AREA FORECAST DISCUSSION...UPDATED
NWS MORRISTOWN TN
957 AM EDT WED MAR 12 2014
.DISCUSSION...
A BAND OF SHOWERS MARKS THE POSITION OF THE COLD FRONT...WHICH HAS
MOVED TO THE EAST OF OHX. TIMING OF THE FRONT BRINGS IT THROUGH
OUR AREA BETWEEN 15Z AND 19Z. BEHIND THE FRONT...NO PRECIP APPEARS
ON RADAR...AND THIS TIMING LINES UP WELL WITH THE RUC AND NAM
DEPICTIONS OF DRYING ALOFT. AS A RESULT...WILL SPEED UP THE
DECREASE IN POPS THIS AFTERNOON. SOME LOW LEVEL MOISTURE AND
UPSLOPE NW FLOW WILL KEEP SOME CHANCE POPS GOING IN THE HIGHER
ELEVATIONS.
ALTHOUGH CURRENTLY THE WINDS ACROSS THE AREA ARE BELOW ADVISORY
CRITERIA...BETWEEN 10 AND 20 MPH WITH GUSTS TO 25 MPH...OBS BEHIND
THE FRONT SHOW STRONGER WINDS WILL ARRIVE THIS AFTERNOON. THE WIND
ADVISORY WILL BE LEFT UNCHANGED.
&&
.PRELIMINARY POINT TEMPS/POPS...
CHATTANOOGA AIRPORT, TN 67 28 49 32 / 80 10 0 0
KNOXVILLE MCGHEE TYSON AIRPORT, TN 68 25 43 32 / 90 60 0 0
OAK RIDGE, TN 66 25 43 32 / 80 40 0 0
TRI CITIES AIRPORT, TN 65 21 38 26 / 90 60 20 0
&&
.MRX WATCHES/WARNINGS/ADVISORIES...
NC...WIND ADVISORY UNTIL 11 PM EDT THIS EVENING FOR CHEROKEE-CLAY.
TN...WINTER WEATHER ADVISORY FROM 6 PM THIS EVENING TO 4 AM EDT
THURSDAY FOR BLOUNT SMOKY MOUNTAINS-COCKE SMOKY MOUNTAINS-
JOHNSON-SEVIER SMOKY MOUNTAINS-SOUTHEAST CARTER-SOUTHEAST
GREENE-SOUTHEAST MONROE-UNICOI.
WIND ADVISORY UNTIL 11 PM EDT /10 PM CDT/ THIS EVENING FOR
ANDERSON-BLEDSOE-BLOUNT SMOKY MOUNTAINS-BRADLEY-CAMPBELL-
CLAIBORNE-COCKE SMOKY MOUNTAINS-EAST POLK-GRAINGER-HAMBLEN-
HAMILTON-HANCOCK-HAWKINS-JEFFERSON-JOHNSON-KNOX-LOUDON-
MARION-MCMINN-MEIGS-MORGAN-NW BLOUNT-NORTH SEVIER-NORTHWEST
CARTER-NORTHWEST COCKE-NORTHWEST GREENE-NORTHWEST MONROE-
RHEA-ROANE-SCOTT TN-SEQUATCHIE-SEVIER SMOKY MOUNTAINS-
SOUTHEAST CARTER-SOUTHEAST GREENE-SOUTHEAST MONROE-SULLIVAN-
UNICOI-UNION-WASHINGTON TN-WEST POLK.
VA...WINTER WEATHER ADVISORY FROM 6 PM THIS EVENING TO 4 AM EDT
THURSDAY FOR WISE.
WIND ADVISORY UNTIL 11 PM EDT THIS EVENING FOR LEE-RUSSELL-SCOTT-
WASHINGTON-WISE.
&&
$$
DGS
AREA FORECAST DISCUSSION
NWS BROWNSVILLE TX
1213 AM CDT WED MAR 12 2014
.DISCUSSION...UPDATED FOR LATEST AVIATION DISCUSSION BELOW.
&&
.AVIATION...A LITTLE DISAGREEMENT IN THE MODELS WRT LOW CIG AND
VIS IN THE OVERNIGHT HOURS. 11-3.9 IMAGERY HINTING AT SOME CLOUD
DEVELOPMENT SOUTH OF THE AREA AND HRRR AND NAM CONTINUE TO SHOW
IFR DEVELOPING OVERNIGHT. NOT VERY CONFIDENT IN THIS SCENARIO BUT
WILL SIDE WITH WORST CASE AND SHOW IFR CONDS 08-13Z. FRONT STILL
ON TAP INTO THE VALLEY 12-13Z ACCORDING TO THE NAM WITH STRONG
NORTHERLY WINDS EXPECTED BEHIND THE FRONT FOR MOST OF THE DAY. NO
MOISTURE FOR THE FRONT SO NO PRECIPITATION EXPECTED WITH THE
PASSAGE. CONDS IMPROVE AFTER SUNSET WITH WINDS FALLING TO 10 KTS
OR LESS AFT 02Z.
&&
.PREV DISCUSSION... /ISSUED 804 PM CDT TUE MAR 11 2014/
DISCUSSION...UPDATED FOR LATEST AVIATION DISCUSSION BELOW.
AVIATION...VFR CONDITIONS WILL PREVAIL EARLY IN THE TAF PERIOD
AS THE S-SE LOW LEVEL FLOW BRINGS IN WAA WHICH ERODED AWAY THE
MORNING CLD COVER AND FOG EARLIER TODAY. EXPECT SOME LOW CLDS AND
FOG TO REFORM LATER TONIGHT AS FORECAST SOUNDINGS NEAR THE
COASTLINE INDICATE THAT A FAIRLY SATURATED LOW LEVEL INVERSION
WILL REFORM. THE FROPA EXPECTED EARLY TOMORROW MORNING WILL BRING
AROUND SOLID VFR CONDITIONS THROUGH 00Z TOMORROW EVENING AS DRIER
NORTHERLY LOW LEVEL FLOW ERODES AWAY ANY LINGERING FOG/LOW CLDS.
THE EVENING TAF ISSUANCE LEANS MORE TOWARDS THE NAM GUIDANCE
VERSUS THE GFS.
PREV DISCUSSION... /ISSUED 301 PM CDT TUE MAR 11 2014/
.BIG WINDS TO WELCOME WEDNESDAY...
SHORT TERM /NOW THROUGH WEDNESDAY NIGHT/...STRATUS LAYER IS LIFTING AND
SCATTERING OVER ITS FINAL STRONGHOLD IN CAMERON COUNTY. OVER THE
GULF IT WILL BE A LITTLE MORE PERSISTENT BUT SHOULD BEGIN TO CLEAR
BY 4 PM OR SO. A TROUGH IS DIGGING INTO THE CENTRAL PLAINS THAT IS
SENDING ANOTHER COLD FRONT TO THE SOUTH ACROSS NORTH CENTRAL TEXAS
AND THAT WILL TAKE AIM ON THE AREA EARLY WEDNESDAY. TEMPERATURES ARE
ON THEIR WAY UP INTO THE UPPER 70S TO PERHAPS LOW 80S AFTER A SLOW
START AMID SOUTHWESTERLY SURFACE WINDS AND FULL SUNSHINE.
TONIGHT...PATCHY FOG IS THE PRIMARY FORECAST CONCERN TONIGHT AS
WINDS SLACKEN AHEAD OF THE APPROACHING FRONT. SOUTHWEST WINDS WILL
BE A LITTLE HIGH FOR RADIATION FOG BUT SUSPECT WINDS WILL LAY DOWN
MORE THAN PROGGED IN THE ARW/NMM GUIDANCE AND CONTINUED A PATCHY
MENTION IN THE FORECAST. FOR NOW THE PROSPECTS OF DENSE FOG APPEAR
PRETTY LOW.
WEDNESDAY...ANOTHER FRONT WILL BLAST THROUGH THE AREA IN THE MORNING
HOURS ON WEDNESDAY PROVIDING STRONG NORTH WINDS AND MUCH DRIER AIR.
WIND VALUES APPROACH ADVISORY CRITERIA FOR MOST OF THE AREA AND MEET
OR EXCEED IT IN THE COASTAL COUNTIES. WILL HOWEVER ALLOW THE EVENING
SHIFT TO MAKE THE FINAL DETERMINATION ON IF AND WHERE THE ADVISORY
SHOULD BE HOISTED. STRONG NORTH WINDS WILL ROUGHEN SEAS AND LEAD TO
A HIGH RISK OF RIP CURRENTS AND WILL SEND A RIP CURRENT STATEMENT
WITH THIS FORECAST PACKAGE FOR THE WILLACY AND CAMERON COUNTY
BEACHES TO HIGHLIGHT AWARENESS DURING POPULAR SPRING BREAK TIMES
ALTHOUGH WATER TEMPS IN THE UPPER 50S WILL LIKELY BE A GOOD
DETRACTOR FROM SPENDING MUCH TIME IN THE WATER TOMORROW. HIGH
TEMPERATURES SHOULD OCCUR EARLY IN THE DAY ON WEDNESDAY ALTHOUGH
SKIES WILL CLEAR OUT BY MID TO LATE MORNING SO A LITTLE WARMING
DURING THE AFTERNOON IS LIKELY DESPITE COLD AIR ADVECTION. WITH VERY
LITTLE AVAILABLE MOISTURE KEPT RAINFALL CHANCES OUT OF THE FORECAST.
WEDNESDAY NIGHT...MUCH COOLER FOR THE NIGHTTIME WEDNESDAY BUT NORTH
WINDS WILL KEEP UP AT 5 TO 10 MPH THROUGH THE OVERNIGHT WITH LOWS IN
THE LOW TO MID 40S DESPITE GENERALLY CLEAR SKIES.
LONG TERM /THURSDAY THROUGH TUESDAY/...DETERMINISTIC FORECAST
INCREASES IN DIFFICULTY TOWARD THE END OF THE PERIOD AS THE SPLIT-
FLOW PATTERN CONTINUES TO WREAK HAVOC WITH GLOBAL MODEL DEPICTION
OF THE SENSIBLE WEATHER FROM LATE WEEKEND INTO EARLY NEXT WEEK. IN
THE MEANTIME...THE AFOREMENTIONED FLOW ENSURES NO SIGNIFICANT
DEVELOPMENT OF A WARMING SPRINGTIME ATMOSPHERIC RIDGE...AND
CONFIDENCE IS INCREASING FOR A FIFTH CONSECUTIVE MONTH WITH BELOW
NORMAL TEMPERATURES FOR THE VALLEY.
THE FORECAST FOR THURSDAY THROUGH SATURDAY IS LARGELY UNCHANGED.
ZONAL FLOW ALOFT AND A QUICK RETURN TO EAST/NORTHEAST FLOW AT THE
SURFACE ALLOWS A CHILLY START TO MODERATE NICELY ON THURSDAY.
HOWEVER...GUT FEELING...MODEL TRENDS...WELL BELOW AVERAGE
NEARSHORE WATER TEMPERATURES...AND RECENT EVENTS SUGGEST THIS SAME LOW
LEVEL FLOW WILL BRING A QUICK RETURN OF A BROKEN TO PERHAPS
OVERCAST DECK AT 4-5K FEET WHICH MAY PUT A LID ON JUST HOW HIGH
TEMPERATURES CAN GO THURSDAY AFTERNOON. HAVE LEFT MAINLY MID TO
HIGH 60S WHICH IS SOME 10-12 DEGREES BELOW AVERAGE FOR MARCH 13TH.
THE CLOUDS WILL HANG AROUND AND SPREAD ACROSS THE ENTIRE REGION
THURSDAY NIGHT AND FRIDAY AS SURFACE HUMIDITY PICKS UP AND
MODERATION CONTINUES. NAM RAW TEMPERATURE DATA FOR FRIDAY MORNING
WAS TOSSED AS THE CLOUDS AND SOUTHEAST FLOW WILL INSULATE...BUT
WITH STILL RELATIVELY LOW DEWPOINTS EXPECT VALUES TO FALL SOME
5-10 DEGREES WITH LOWS RANGING THROUGH THE 50S BEFORE RECOVERING
WELL INTO THE 70S TO AROUND 80 WITH SOME INCREASE IN SOUTHEAST
WINDS FRIDAY AFTERNOON.
ZONAL/WEST SOUTHWEST FLOW AT 500 MB ARRIVES SATURDAY WITH THE
ECMWF A BIT MORE PRONOUNCED WITH LEAD SHORT WAVE AND SOME
PRECIPITATION ACROSS EAST AND SOUTHEAST TEXAS. GFS A BIT MORE
WESTERLY WITH ZONAL FLOW DOMINATING...AND THIS MAY BE THE BETTER
SOLUTION. IN EITHER CASE...EXPECT CONSIDERABLE CLOUDS TO CONTINUE
WITH A WARMER START (LOW TO MID 60S) AND TEMPERATURES JUST A HAIR
ABOVE THOSE ON FRIDAY.
THE MUDDLED FORECAST BEGINS BY SUNDAY. IN THE BIG PICTURE...BOTH
ECMWF AND GFS DIVE A SHORT WAVE FROM NEW MEXICO THROUGH EL PASO ON
INTO NORTH CENTRAL MEXICO BETWEEN SATURDAY NIGHT AND SUNDAY NIGHT.
THE DIVERGENCE BEGINS THEREAFTER WITH THE ECMWF HOLDING ITS COURSE
DIGGING THE TROUGH ALL THE WAY TO BAJA CALIFORNIA...WHILE THE GFS
OPENS THE WAVE UP IN DURANGO WHILE EJECTING WAVES NORTHEAST
THROUGH SOUTH TEXAS SUNDAY NIGHT THROUGH MONDAY NIGHT. DIFFERENCE
APPEARS TO BE IN HANDLING/STRENGTH OF THE NEXT EASTERN U.S.
TROUGH. THE GFS HAS A FLATTER SOLUTION WHICH OPENS THE DOOR FOR
THE MORE ACTIVE SUBTROPICAL JET WHILE THE ECMWF BRINGS ENOUGH
NORTHWEST FLOW ALOFT TO NUDGE AWAY ALL THE DEEP MOISTURE AND
BEGIN A DRYING AND WARMING TREND.
WHICH TO CHOOSE? VERY HARD TO SAY. GFS ENSEMBLES ARE IN GOOD
AGREEMENT WITH THE OPEN WAVE THOUGH A FEW MEMBERS FOLLOW THE GFS
INTO THE BAJA CUTOFF `GRAVEYARD` AS IT WERE. ALSO...VERY HARD TO
COMPLETELY "FLIP" FROM A VERY LOW RAIN CHANCE NEXT MONDAY TO A 80
PERCENT CHANCE WITH QPF NEARING 2 INCHES...JUST YET. FOLLOWING THE
MORE CONSISTENT ECMWF BUT OWING TO SOME ENERGY EJECTING TOWARD THE
VALLEY...SIMILAR TO RECENT EVENTS...HAVE EXTENDED RAIN CHANCES
INTO SUNDAY NIGHT AND EARLY MONDAY (NEAR THE RIVER). ALSO...THE
GFS TEMPORARY PERIOD OF STRONG EAST WINDS /15 TO 25 MPH/ DOESN`T
SEEM LIKELY AS `BRIDGING` HIGH PRESSURE CELLS ARE VERY UNCOMMON
FOR DEEP SOUTH TEXAS. TEMPERATURES ARE DIFFICULT...BUT GIVEN THE
NORTHERLY FLOW AND CLOUD COVER HAVE NUDGED BOTH SUNDAY AND MONDAY
UP TO 10 DEGREES BELOW AVERAGE AND KEPT TUESDAY A FEW DEGREES
BELOW AVERAGE (AVERAGES BY THEN RANGE FROM THE UPPER 70S TO MID
80S ON MARCH 18).
MARINE...NOW THROUGH WEDNESDAY...MODERATE SOUTHEAST WINDS ARE EXPECTED
THROUGH THE REST OF THE AFTERNOON AND TONIGHT. PATCHY FOG MAY REFORM
AGAIN TONIGHT. A COLD FRONT WILL SWEEP ACROSS THE LOWER TEXAS COAST
TONIGHT AND IS EXPECTED TO PRODUCE FREQUENT GALE FORCE GUSTS FOR
AROUND 6 HOURS AND A GALE WARNING HAS BEEN ISSUED FOR ALL LOWER
TEXAS COASTAL WATERS DURING THIS TIME. SMALL CRAFT ADVISORIES WILL
LIKELY BE REQUIRED THROUGH THE REST OF THE AFTERNOON INTO WEDNESDAY
NIGHT DUE TO PERSISTING NORTH WINDS AND ROUGH SEAS.
THURSDAY THROUGH SUNDAY...MODERATE SEAS SUBSIDE TOWARD LIGHT TO
MODERATE LEVELS THURSDAY AND CONTINUE THROUGH SATURDAY...WITH
HEIGHTS AVERAGING IN THE 3-4 FOOT RANGE THROUGH THE PERIOD.
NORTHEAST WINDS 15 KNOTS OR LESS VEER TO SOUTHEAST AT SIMILAR OR
LOWER SPEEDS...PARTICULARLY NEAR THE COAST WHERE ROBUST MARINE
LAYER HOLDS SWAY OVER THE VERY COOL WATERS FOR THIS TIME OF YEAR.
FORECAST SUNDAY IS HIGHLY UNCERTAIN. GFS EASTERLY SURGE WAS THROWN
OUT...WITH LIGHT WINDS SHIFTING NORTH AND INCREASING TOWARD
ADVISORY /20 KNOT/ LEVELS SOMETIME DURING THE DAY WITH AN
EQUIVALENT UPTICK IN SEAS. SHOULD BE ABLE TO GET A BETTER HANDLE
ON SITUATION AS WE MOVE TOWARD THE WEEKEND.
FIRE WEATHER...FORTUNATELY...GREENUP HAS BEGUN FOR MOST AREAS IN
DEEP SOUTH TEXAS COURTESY OF THE LATE FEBRUARY WARMUP AND RECENT
RAINS HAVE REPLENISHED/SUPPLEMENTED SOIL MOISTURE. THAT WILL BE
ENOUGH TO KEEP THE THREAT OF RAPID FIRE SPREAD DOWN BEHIND
WEDNESDAY`S SURGING NORTH WINDS AND LOWERING HUMIDITY. WE`RE
EXPECTING SOME AREAS TO LAND IN THE 20-25% RH/25 MPH SUSTAINED
WIND ZONE...BUT FUEL DRYNESS BEGINS ABOVE AVERAGE AND WILL NOT
RECOVER IN JUST A DAY. THAT SAID...NOT A GREAT TIME TO BURN WITHIN
3-5 HOURS OF THE FRONT WITH GUSTS AT OR ABOVE 35 MPH.
CLIMATE...AFTER NEARLY ONE THIRD OF MARCH...TEMPERATURES WERE
RUNNING SOME 7 TO 10 DEGREES BELOW AVERAGE. WITH RECOVERY STALLED
BY THE WEDNESDAY FRONT AND PERHAPS A DAY OR TWO AT OR JUST ABOVE
AVERAGE FOLLOWED BY ANOTHER POTENTIAL COOLDOWN HEADING INTO THE
17TH/18TH...THE DEPARTURES WILL LIKELY REMAIN AT 5 TO 7 DEGREES
WITH MORE THAN HALF OF THE MONTH GONE. AT THAT POINT...DAILY HIGH
TEMPERATURES WOULD HAVE TO RUN 85 TO 90 WITH RELATIVELY MUGGY
NIGHTS TO CATCH UP TO ZERO AND WHILE NOT OUT OF THE QUESTION
BECOMES A HIGHLY UNLIKELY PROPOSITION ESPECIALLY WITH AN ACTIVE
SPLIT JET EXPECTED TO CONTINUE. TIME WILL TELL...BUT MARCH COULD
BE THE FIFTH CONSECUTIVE BELOW NORMAL MONTH FOR THE VALLEY. STAY
TUENED.
&&
.BRO WATCHES/WARNINGS/ADVISORIES...
TX...HIGH RIP CURRENT RISK FROM 8 AM CDT THIS MORNING THROUGH THIS
AFTERNOON FOR TXZ256-257.
GM...GALE WARNING FROM 8 AM THIS MORNING TO 5 PM CDT THIS AFTERNOON
FOR GMZ130-132-135-150-155-170-175.
&&
$$
THIS PRODUCT IS ALSO AVAILABLE ON THE WEB AT:
HTTP://WEATHER.GOV/RGV
55
AREA FORECAST DISCUSSION
NWS GRAND RAPIDS MI
321 AM EDT FRI MAR 14 2014
LATEST UPDATE...
SYNOPSIS/SHORT TERM/LONG TERM
.SYNOPSIS...
ISSUED AT 321 AM EDT FRI MAR 14 2014
BREEZY SOUTHWEST WINDS WILL PUSH TEMPERATURES INTO THE 40S TODAY FOR
MOST LOCATIONS. THE WARMER AIR WILL BE SHORT LIVED THOUGH AS A COLD
FRONT WILL DROP SOUTH THROUGH THE AREA THIS AFTERNOON AND EARLY
EVENING. THE COLD FRONT MAY LEAD TO SOME SCATTERED RAIN SHOWERS. A
REINFORCING COLD FRONT PASSES THROUGH OVERNIGHT WITH SOME SPRINKLES
CHANGING OVER TO A FEW FLURRIES. COLDER AIR WILL CONTINUE TO FILTER
INTO THE GREAT LAKES OVER THE WEEKEND AS ARCTIC HIGH PRESSURE
SETTLES INTO THE REGION. HIGHS WILL ONLY REACH THE 30S ON SATURDAY
AND THE 20S ON SUNDAY. DRY WEATHER IS FORECAST OVER THE WEEKEND DUE
TO THE AREA OF HIGH PRESSURE. THE NEXT WEATHER MAKER FOR SOUTHWEST
LOWER MICHIGAN WILL COME NEXT TUESDAY NIGHT INTO WEDNESDAY BRINGING
A CHANCE FOR RAIN AND SNOW.
&&
.SHORT TERM...(TODAY THROUGH SUNDAY)
ISSUED AT 321 AM EDT FRI MAR 14 2014
LIMITED WEATHER CONCERNS EXIST IN THE SHORT TERM...BUT PERTAIN TO
CHANCES FOR PRECIPITATION TODAY AND TONIGHT. WE HAVE A DRY FORECAST
FOR SATURDAY THROUGH SUNDAY AS HIGH PRESSURE GRADUALLY SAGS SOUTH
INTO THE GREAT LAKES.
FOR TODAY...MODELS ARE FORECASTING THE COLD FRONT TO DROP SOUTH
THROUGH THE AREA THIS AFTERNOON AND EVENING. THE HRRR AND RAP HI-RES
SHORT TERM MODELS BOTH SHOW PRECIPITATION IN A NARROW RIBBON ALONG
THE COLD FRONT. HAVE 30 PCT CHC POPS NORTH AND 20 PCT SOUTH FOR THIS
AFTERNOON. IT APPEARS THERE WILL BE JUST ENOUGH DEPTH TO THE
MOISTURE FOR THIS TO OCCUR. TEMPS SHOULD NOSE INTO THE MIDDLE 40S
FOR HIGHS. READINGS ARE ALREADY AROUND 40 AT THIS TIME OF NIGHT
ACROSS SRN WI AND NRN IL WHICH IS OUR SOURCE REGION TODAY.
IT WILL BE BREEZY TODAY AS SOUTHWEST WINDS OF 15 TO 30 MPH CAN BE
EXPECTED. GUSTS IN EXCESS OF 30 MPH ARE A GOOD BET. A LLJ ON THE
ORDER OF 50 KNOTS OR SO WILL SWING THROUGH THE FORECAST AREA THIS
MORNING. HOLLAND IS ALREADY SEEING STRONG WINDS GUSTING TO 29 KNOTS.
TONIGHT...A SECONDARY COLD FRONT PASSES SOUTH THROUGH THE AREA AND
ENVISION A FEW SPRINKLES OR FLURRIES AROUND. HAVE MINIMAL POPS IN
TONIGHT...20 PCT...TO COVER THE LIGHT PRECIP. 850MB TEMPS BY
MORNING WILL HAVE FALLEN BACK TO -5 TO -10C FROM +7C THIS MORNING.
DRY WEATHER FORECAST FOR SATURDAY THROUGH SUNDAY BUT WE WILL NEED TO
KEEP AN EYE ON A BAROCLINIC ZONE THAT SETS UP ACROSS THE SOUTHERN
GREAT LAKES ON SATURDAY EVENING. MODELS HAVE SOME PRECIP
NEARBY...BUT JUST FEEL WE ARE GOING TO BE TOO DRY TO SQUEEZE
ANYTHING OUT.
.LONG TERM...(SUNDAY NIGHT THROUGH THURSDAY)
ISSUED AT 321 AM EDT FRI MAR 14 2014
FAIR WEATHER IS EXPECTED SUNDAY NIGHT THROUGH EARLY NEXT WEEK WITH A
RIDGE IN CONTROL OF THE WX PATTERN. TEMPS IN THIS TIME FRAME WILL BE
UNSEASONABLY COLD SUNDAY NIGHT AND MONDAY BEFORE UNDERGOING A
GRADUAL MODERATING TREND TUESDAY INTO WEDNESDAY AS SOUTHERLY FLOW
WAA DEVELOPS OUT AHEAD OF THE NEXT SYSTEM.
A FAIRLY STRONG LOW PRESSURE SYSTEM IS EXPECTED TO TRACK NE ACROSS
OUR REGION TOWARD THE MIDDLE OF NEXT WEEK BRINGING POTENTIAL FOR A
MIX OF RAIN AND SNOW TUESDAY NIGHT THROUGH WEDNESDAY. ANOTHER SHOT
OF COOLER AIR WILL LIKELY MOVE IN BEHIND THAT SYSTEM LATE IN THE
WEEK WITH POTENTIAL FOR SOME LINGERING LIGHT SNOW SHOWERS OR
FLURRIES INTO THURSDAY.
&&
.AVIATION...(FOR THE 06Z TAFS THROUGH 06Z FRIDAY NIGHT)
ISSUED AT 1150 PM EDT THU MAR 13 2014
SATELLITE IMAGERY SHOWS THIN STRATUS WITH BASES 1500 TO 2500 FEET
AGL FROM MKG TO LAN LATE THURSDAY EVENING IS FINALLY STARTING TO
LIFT NORTH AND EAST. OTHER THAN THIS VFR CONDITIONS SHOULD PREVAIL
THROUGH FRIDAY. SOUTH WINDS TONIGHT AROUND 10 KNOTS WILL BECOME
SOUTHWEST AND INCREASE FRIDAY WITH GUSTS OVER 20 KNOTS INTO THE
AFTERNOON.
&&
.HYDROLOGY...
ISSUED AT 323 PM EDT THU MAR 13 2014
THE PERIODS OF WARMER TEMPERATURE WITH LIMITED RAIN MIXED WITH COLD
SNAPS OF LATE HAS RESULTED IN A DECREASE IN ICE DEPTH ON RIVERS AND
HAS DECREASED THE MOISTURE TRAPPED IN THE SNOW PACK. CURRENT SNOW
WATER EQUIVALENT VALUES ARE GENERALLY IN THE 2 TO 4 INCH RANGE. THIS
WEATHER PATTERN IS EXPECTED TO CONTINUE THROUGH THE NEXT WEEK...
WHICH SHOULD LOWER THE CHANCES FOR ICE JAM FORMATION AND FLOODING AS
WE PROGRESS INTO SPRING.
&&
.GRR WATCHES/WARNINGS/ADVISORIES...
MI...NONE.
LM...NONE.
&&
$$
SYNOPSIS...DUKE
SHORT TERM...DUKE
LONG TERM...LAURENS
AVIATION...OSTUNO
HYDROLOGY...63
AREA FORECAST DISCUSSION
NWS LA CROSSE WI
342 AM CDT FRI MAR 14 2014
.SHORT TERM...(TODAY AND TONIGHT)
ISSUED AT 342 AM CDT FRI MAR 14 2014
THE MAIN FOCUS TODAY/TONIGHT IS ON THE PAIR OF COLD FRONTS THAT
WILL SWING THROUGH THE REGION.
SOUTHWESTERLY LOW LEVEL FLOW OVERNIGHT HAS KEPT TEMPERATURES UP
INTO THE LOW 40S THROUGH MUCH OF THE REGION WITH THE EXCEPTION OF
NORTH CENTRAL WISCONSIN WHERE WINDS WENT CALM AND RADIATIONAL
COOLING LET TEMPERATURES SLIP TOWARD THE FREEZING MARK. AT THE
SURFACE...A LOW JUST WEST OF LAKE SUPERIOR HAS A COLD FRONT THAT
DROPS SOUTH OUT OF IT THROUGH EASTERN MINNESOTA ON INTO WESTERN
IOWA. A SECONDARY COLD FRONT IS DRAPED TO THE NORTH OF THE LOW
AND RUNS EAST TO WEST ACROSS SOUTH CENTRAL CANADA. FURTHER
ALOFT...A MID LEVEL TROUGH EXTENDS FROM WESTERN ONTARIO INTO THE
NORTHERN PLAINS VIA 14.07Z RAP ANALYSIS/WATER VAPOR IMAGERY AND IS
PROVIDING SOME MID TO UPPER LEVEL CLOUD COVER AHEAD OF IT.
FOR TODAY...THERE HAVE BEEN SOME SIGNALS THAT SOME LIGHT RAIN
SHOWERS COULD DEVELOP THIS MORNING/AFTERNOON BEHIND THE FIRST COLD
FRONT PASSAGE AND AHEAD OF THE MID LEVEL TROUGH. LOOKING
UPSTREAM...THERE IS NOT MUCH IN THE WAY OF LOW/MID LEVEL CLOUD
COVER WITH THIS PASSING WAVE AND NOTHING ON REGIONAL RADARS. THE
14.07Z RAP DOES SHOW AN INCREASING TREND IN RH THROUGH THE DAY
THROUGH THE HRRR HAS TRENDED DRIER WITH ANY 1KM AGL REFLECTIVITY
RETURNS. CONSIDERED ADDING IN A SMALL CHANCE FOR A RAIN
SHOWER...BUT CONFIDENCE IN ANYTHING OCCURRING IS TOO LOW TO TOSS
IT IN THERE. TEMPERATURES WILL DROP THE MOST AS THE SECONDARY COLD
FRONT SWINGS THROUGH LATER THIS AFTERNOON AND EARLY EVENING WITH A
STRATUS DECK LIKELY ACCOMPANYING IT.
.LONG TERM...(SATURDAY THROUGH THURSDAY)
ISSUED AT 342 AM CDT FRI MAR 14 2014
THE MAIN FOCUS FOR THE EXTENDED PERIOD IS ON SNOW
CHANCES...PARTICULARLY FOR TUESDAY WHEN A POTENT STORM SYSTEM
COULD MOVE THROUGH THE REGION.
THE FIRST ROUND OF PRECIPITATION COMES IN MAINLY AS SNOW ALONG A
FRONTOGENETIC BAND THAT LOOKS LIKE IT FORMS SATURDAY MORNING AND
DRIFTS SOUTH INTO SATURDAY EVENING. HAVE UPPED THE PRECIPITATION
CHANCES FOR THIS PERIOD...PARTICULARLY IN NORTHEAST IOWA THOUGH
THE 14.00Z ECMWF SHOOTS SOUTH OF THE REGION AND WOULD KEEP THINGS
DRY FOR THE MOST PART. BECAUSE OF THIS...HAVE NOT GONE UP TO
LIKELIES YET. SOME QUESTIONS IN WHETHER A WARM LAYER WILL BE
PRESENT TO CHANGE THE PRECIPITATION OVER TO RAIN OR A MIX. THE
14.00Z NAM SOUNDINGS DO SHOW A WARM LAYER TO +3C AROUND 875MB
WHILE THE 14.00Z KEEP THE THERMAL PROFILE UNDER 0C. THIS COULD
KEEP SNOW TOTALS DOWN A BIT...PARTICULARLY IF THE NAM WARM LAYER
OCCURS. 14.03Z SREF PLUMES FOR SNOW ACCUMULATIONS ALSO ADD SOME
UNCERTAINTY WITH THE MEAN BEING AROUND 1-2 INCHES THOUGH A FEW
MEMBERS GO OFF THE CHARTS DUE TO THE FGEN FORCING. HAVE GONE THE
CONSERVATIVE ROUTE AND KEPT THE SNOW TOTALS TO 2 INCHES OR LESS
WITH THE HIGHEST AMOUNTS IN NORTHEAST IOWA.
THERE WILL BE ANOTHER SHOT FOR SOME LIGHT SNOW SUNDAY NIGHT INTO
MONDAY IN ASSOCIATION WITH LOW LEVEL WARM AIR ADVECTION OCCURRING
AHEAD A MORE POTENT SYSTEM THAT WILL BE DEVELOPING ACROSS THE
PLAINS ON TUESDAY. BOTH THE 14.00Z GFS AND ECMWF SHOW A CLOSING
OFF/NEGATIVELY TITLED MID LEVEL TROUGH FORMING ACROSS THE UPPER
MISSISSIPPI RIVER VALLEY WITH A DEEPENING SURFACE LOW PROPAGATING
FROM THE PLAINS INTO THE GREAT LAKES ON TUESDAY. THERE ARE SOME
DIFFERENCES IN THE TRACK OF THIS TROUGH/LOW WITH THE 14.00Z ECMWF
BEING FURTHER NORTH AND FASTER COMPARED TO THE GFS. WITH THE MORE
SOUTHERLY TRACK FROM NORTHERN MISSOURI TO CHICAGO...THE 14.00Z GFS
SOLUTION HAS THE MAIN SNOW BAND GOING FROM SIOUX FALLS SD TOWARD
THE TWIN CITIES. MEANWHILE...THE 14.00Z ECMWF TAKES THE SURFACE
LOW MORE ON A WEST TO EAST PATH BEFORE OCCLUDING IT IN EASTERN
WISCONSIN AND PUTS ITS MAIN SNOW BAND FROM SOUTHEAST MINNESOTA
INTO NORTH CENTRAL WISCONSIN. SOME HEAVY SNOW LOOKS LIKELY WITH
THIS STORM AT ITS CURRENT INTENSITY...SO WILL HAVE TO WATCH THE
TRENDS WITH THIS POTENT SYSTEM AS WE GET CLOSER TO IT.
&&
.AVIATION...(FOR THE 06Z TAFS THROUGH 06Z FRIDAY EVENING)
ISSUED AT 1027 PM CDT THU MAR 13 2014
BRISK SOUTHWEST WINDS OF 45-50 KT ARE PRESENT AT 1500-2000 FT
ABOVE THE GROUND...WHILE SURFACE WINDS ARE SOUTHERLY AT 10-15
KT...RESULTING IN LOW LEVEL WIND SHEAR. EXPECT THE LOW LEVEL WIND
SHEAR TO END BY 09Z AS A COLD FRONT MOVES ACROSS THE TAF SITES.
PLENTIFUL DRY AIR AROUND THE FRONT WILL KEEP CONDITIONS VFR. LOOK
FR WINDS TO SHIFT TOWARDS THE NORTHWEST IN THE WAKE OF THE FRONT.
A SECONDARY COLD FRONT IN NORTH DAKOTA LOOKS TO PASS THROUGH THE
TAF SITES BETWEEN 13-16Z. EXPECT THE NORTHWEST WINDS TO INCREASE
WITH GUSTS AROUND 25 KT IN ITS WAKE. IN ADDITION...SOME
STRATOCUMULUS SHOULD INVADE THE TAF SITES. HARD TO SAY IF CEILINGS
WILL BE MVFR OR VFR AT THIS POINT. UPSTREAM THEY REMAIN MOSTLY
VFR WITH ONLY SOME SCATTERED MVFR...SO CONTINUE TO FOLLOW THAT
IDEA IN THE TAFS WITH SCT MVFR AND A BKN VFR CEILING. SOME SPRINKLES
OR FLURRIES ARE POSSIBLE TOO FROM THESE CLOUDS. PLAN ON THE CLOUDS
TO PERSIST THROUGH MUCH OF THE DAY...THEN SCATTER/CLEAR IN THE
EVENING AS DRY AIR FILTERS IN. THE GUSTS WILL ALSO DIMINISH IN THE
EVENING WITH THE LOSS OF DAYTIME HEATING.
&&
.ARX WATCHES/WARNINGS/ADVISORIES...
WI...NONE.
MN...NONE.
IA...NONE.
&&
$$
SHORT TERM...HALBACH
LONG TERM...HALBACH
AVIATION...AJ
AREA FORECAST DISCUSSION
NWS PHOENIX AZ
515 AM MST FRI MAR 14 2014
.UPDATE...UPDATED AVIATION AND FIRE WEATHER DISCUSSIONS...
&&
.SYNOPSIS...
ISOLATED SHOWERS AND THUNDERSTORMS ARE EXPECTED TODAY MAINLY ACROSS
THE HIGHER TERRAIN NORTH AND EAST OF PHOENIX AS AN AREA OF LOW
PRESSURE MOVES EASTWARD THROUGH ARIZONA. WARMER CONDITIONS WILL
RETURN FOR THE WEEKEND AS HIGH PRESSURE BECOMES REESTABLISHED ACROSS
THE DESERT SOUTHWEST. ABOVE AVERAGE TEMPERATURES WILL PERSIST
THROUGH NEXT WEEK WITH NO CHANCE OF PRECIPITATION.
&&
.DISCUSSION.../ISSUED AT 310 AM MST MAR 14 2014/...
AN AREA OF LOW PRESSURE CONTINUES TO MOVE EASTWARD THROUGH AZ THIS
MORNING. LATEST IR IMAGERY SHOWS WIDESPREAD MID CLOUDS WITH SOME
COOLING TOPS ACROSS NORTHERN AZ. ACROSS SOUTH-CENTRAL AZ...ISOLATED
LIGHT SHOWERS HAVE BEEN OBSERVED ACROSS THE PHOENIX AREA AND WHERE
IT IS NOT RAINING...LATEST RADAR IMAGERY SUGGESTS THAT VIRGA IS
PREVALENT. AT DEER VALLEY AIRPORT...WINDS BRIEFLY GUSTED TO 23 MPH
DURING A SHOWER AND ADDITIONAL ISOLATED GUSTS AS HIGH AS 35 MPH ARE
POSSIBLE THIS MORNING. MEANWHILE...STRONGER THAN NORMAL WINDS ALONG
WITH THE CLOUDS ARE RESULTING IN RELATIVELY WARM CONDITIONS. AS OF 3
AM...THE TEMPERATURE AT KPHX HAS NOT DROPPED BELOW 70 DEGREES.
RECORD WARM MINIMUM FOR TODAY IS 64 DEGREES WHICH LAST OCCURRED IN
1984.
MAIN VORT MAX EVIDENT ON WV IMAGERY NEAR BLYTHE CONTINUES TO PIVOT
CYCLONICALLY...WHICH HAS SLOWED THE EASTWARD PROGRESSION OF THE
TROUGH. CONSEQUENTLY...LATEST HRRR INDICATES THAT AREAS OF VIRGA AND
SHOWERS WILL BACKBUILD ACROSS SOUTH-CENTRAL AZ AND PERSIST THIS
MORNING. LATEST GPS-MET AT TEMPE MEASURED AN IPW NEAR 0.6 INCHES.
HOWEVER...ANY RAIN THAT MANAGES TO REACH THE SURFACE WILL LIKELY NOT
AMOUNT TO MORE THAN A HUNDREDTH OF AN INCH. GLOBAL AND MESOSCALE
MODELS ARE IN GOOD AGREEMENT THAT SHOWERS WILL BECOME MORE ORGANIZED
LATER THIS MORNING AND THIS AFTERNOON ONCE THE ATMOSPHERE HAS AN
OPPORTUNITY TO DESTABILIZE. STRONGEST QG FORCING FOR ASCENT WILL
SLIDE INTO EASTERN AZ BY LATE MORNING...THOUGH CONVECTIVE AND
OROGRAPHIC EFFECTS WILL PREDOMINATE INSTEAD. SHOWERS WILL MAINLY BE
CONFINED TO THE HIGHER TERRAIN NORTH AND EAST OF PHOENIX AND POPS
WERE RAISED TO AS HIGH AS 80 PERCENT ACROSS A SMALL PORTION OF
EASTERN GILA COUNTY. GIVEN THE SUBSIDENCE BEHIND THE TROUGH
AXIS...ACTIVITY WILL QUICKLY DISSIPATE WITH THE LOSS OF HEATING
AROUND SUNSET.
STRONG ANTICYCLONE IN THE EASTERN PACIFIC WILL SLIDE EASTWARD THIS
WEEKEND WITH TEMPERATURES QUICKLY REBOUNDING INTO THE MID 80S UNDER
SUNNY SKIES. BREEZY CONDITIONS WILL DEVELOP SATURDAY AFTERNOON
BEHIND THE PASSAGE OF A TROUGH...PARTICULARLY DOWN THE CO RIVER
VALLEY WHERE GUSTS MAY REACH AS HIGH AS 30 MPH. WARMEST DAY APPEARS
TO BE MONDAY AS SOMEWHAT OF A RETURN FLOW DEVELOPS AHEAD OF AN
APPROACHING TROUGH DROPPING OUT OF THE ROCKIES. GFS/ECMWF HAVE COME
INTO MUCH BETTER AGREEMENT AND INDICATE THE TROUGH WILL ONLY BRUSH
BY THE FOUR CORNERS OR PERHAPS FURTHER EAST. MAIN IMPACT ACROSS THE
LOWER DESERTS WILL BE SLIGHTLY COOLER TEMPERATURES
TUESDAY-WEDNESDAY. THEREAFTER...HEIGHT RISES WILL HERALD ADDITIONAL
WARMING THROUGH LATE WEEK...THOUGH HIGH TEMPERATURES ARE EXPECTED TO
REMAIN WELL BELOW RECORDS.
&&
.AVIATION...
SOUTH-CENTRAL ARIZONA INCLUDING KPHX...KIWA...AND KSDL...
CONSIDERABLE CLOUDINESS CONTINUES THROUGH MOST OF TODAY...WITH SCT
TO BKN DECKS AROUND 12-14K FEET THROUGH FRIDAY EARLY EVENING. SOME
VIRGA AND LIGHT SHOWERS ARE POSSIBLE THOUGH CONFIDENCE IS LOW
ANYTHING WILL IMPACT THE TAF SITES...SO NO MENTION IN THE AREA TAFS
AT THIS TIME. VARIABLE GUSTY WINDS ARE POSSIBLE WITH SHOWER
DEVELOPMENT...BUT SPEEDS SHOULD REMAIN BELOW 20 KTS. SHOWER ACTIVITY
WILL REMAIN WELL TO THE NORTH AND EAST OF AREA AIR FIELDS BY FRIDAY
AFTERNOON AND EVENING.
SOUTHEAST CALIFORNIA AND SOUTHWEST ARIZONA INCLUDING KIPL AND KBLH...
WINDS WILL GENERALLY FAVOR WEST AT KIPL AND N TO NW AT KBLH
FOLLOWING WEAK FRONTAL PASSAGE...BUT SPEEDS SHOULD MOSTLY STAY AOB
12KT NEXT 24 HOURS. OTHERWISE...PERIODIC MID/HIGH CLOUDS ABOVE 15K
WILL GENERALLY CLEAR BY FRIDAY MORNING.
AVIATION DISCUSSION NOT UPDATED FOR AMENDED TAFS.
&&
.FIRE WEATHER...
SUNDAY THROUGH THURSDAY...
HIGH PRESSURE WILL BUILD EASTWARD INTO THE DESERT SOUTHWEST BRINGING
A WARMING TREND TO THE REGION THROUGH THE WEEKEND. BREEZY CONDITIONS
ARE EXPECTED ON SUNDAY AS A WEATHER SYSTEM SKIRTS BY JUST TO THE
EAST OF THE REGION. DRY CONDITIONS WILL PERSIST WITH MOSTLY CALM
ZONAL WIND FLOW EXPECTED. BRIEF GUSTS ON TUESDAY ALONG THE LOWER
COLORADO RIVER VALLEY ARE POSSIBLE...THOUGH LESS THAN 20 MPH
EXPECTED. NO MENTION OF PRECIPITATION CHANCES DURING THIS TIME
PERIOD.
&&
.PSR WATCHES/WARNINGS/ADVISORIES...
AZ...NONE.
CA...NONE.
&&
$$
VISIT US ON FACEBOOK...TWITTER...AND AT WEATHER.GOV/PHOENIX
DISCUSSION...HIRSCH
AVIATION...CDEWEY
FIRE WEATHER...CDEWEY
AREA FORECAST DISCUSSION
NWS PHOENIX AZ
310 AM MST FRI MAR 14 2014
.SYNOPSIS...
ISOLATED SHOWERS AND THUNDERSTORMS ARE EXPECTED TODAY MAINLY ACROSS
THE HIGHER TERRAIN NORTH AND EAST OF PHOENIX AS AN AREA OF LOW
PRESSURE MOVES EASTWARD THROUGH ARIZONA. WARMER CONDITIONS WILL
RETURN FOR THE WEEKEND AS HIGH PRESSURE BECOMES REESTABLISHED ACROSS
THE DESERT SOUTHWEST. ABOVE AVERAGE TEMPERATURES WILL PERSIST
THROUGH NEXT WEEK WITH NO CHANCE OF PRECIPITATION.
&&
.DISCUSSION...
AN AREA OF LOW PRESSURE CONTINUES TO MOVE EASTWARD THROUGH AZ THIS
MORNING. LATEST IR IMAGERY SHOWS WIDESPREAD MID CLOUDS WITH SOME
COOLING TOPS ACROSS NORTHERN AZ. ACROSS SOUTH-CENTRAL AZ...ISOLATED
LIGHT SHOWERS HAVE BEEN OBSERVED ACROSS THE PHOENIX AREA AND WHERE
IT IS NOT RAINING...LATEST RADAR IMAGERY SUGGESTS THAT VIRGA IS
PREVALENT. AT DEER VALLEY AIRPORT...WINDS BRIEFLY GUSTED TO 23 MPH
DURING A SHOWER AND ADDITIONAL ISOLATED GUSTS AS HIGH AS 35 MPH ARE
POSSIBLE THIS MORNING. MEANWHILE...STRONGER THAN NORMAL WINDS ALONG
WITH THE CLOUDS ARE RESULTING IN RELATIVELY WARM CONDITIONS. AS OF 3
AM...THE TEMPERATURE AT KPHX HAS NOT DROPPED BELOW 70 DEGREES.
RECORD WARM MINIMUM FOR TODAY IS 64 DEGREES WHICH LAST OCCURRED IN
1984.
MAIN VORT MAX EVIDENT ON WV IMAGERY NEAR BLYTHE CONTINUES TO PIVOT
CYCLONICALLY...WHICH HAS SLOWED THE EASTWARD PROGRESSION OF THE
TROUGH. CONSEQUENTLY...LATEST HRRR INDICATES THAT AREAS OF VIRGA AND
SHOWERS WILL BACKBUILD ACROSS SOUTH-CENTRAL AZ AND PERSIST THIS
MORNING. LATEST GPS-MET AT TEMPE MEASURED AN IPW NEAR 0.6 INCHES.
HOWEVER...ANY RAIN THAT MANAGES TO REACH THE SURFACE WILL LIKELY NOT
AMOUNT TO MORE THAN A HUNDREDTH OF AN INCH. GLOBAL AND MESOSCALE
MODELS ARE IN GOOD AGREEMENT THAT SHOWERS WILL BECOME MORE ORGANIZED
LATER THIS MORNING AND THIS AFTERNOON ONCE THE ATMOSPHERE HAS AN
OPPORTUNITY TO DESTABILIZE. STRONGEST QG FORCING FOR ASCENT WILL
SLIDE INTO EASTERN AZ BY LATE MORNING...THOUGH CONVECTIVE AND
OROGRAPHIC EFFECTS WILL PREDOMINATE INSTEAD. SHOWERS WILL MAINLY BE
CONFINED TO THE HIGHER TERRAIN NORTH AND EAST OF PHOENIX AND POPS
WERE RAISED TO AS HIGH AS 80 PERCENT ACROSS A SMALL PORTION OF
EASTERN GILA COUNTY. GIVEN THE SUBSIDENCE BEHIND THE TROUGH
AXIS...ACTIVITY WILL QUICKLY DISSIPATE WITH THE LOSS OF HEATING
AROUND SUNSET.
STRONG ANTICYCLONE IN THE EASTERN PACIFIC WILL SLIDE EASTWARD THIS
WEEKEND WITH TEMPERATURES QUICKLY REBOUNDING INTO THE MID 80S UNDER
SUNNY SKIES. BREEZY CONDITIONS WILL DEVELOP SATURDAY AFTERNOON
BEHIND THE PASSAGE OF A TROUGH...PARTICULARLY DOWN THE CO RIVER
VALLEY WHERE GUSTS MAY REACH AS HIGH AS 30 MPH. WARMEST DAY APPEARS
TO BE MONDAY AS SOMEWHAT OF A RETURN FLOW DEVELOPS AHEAD OF AN
APPROACHING TROUGH DROPPING OUT OF THE ROCKIES. GFS/ECMWF HAVE COME
INTO MUCH BETTER AGREEMENT AND INDICATE THE TROUGH WILL ONLY BRUSH
BY THE FOUR CORNERS OR PERHAPS FURTHER EAST. MAIN IMPACT ACROSS THE
LOWER DESERTS WILL BE SLIGHTLY COOLER TEMPERATURES
TUESDAY-WEDNESDAY. THEREAFTER...HEIGHT RISES WILL HERALD ADDITIONAL
WARMING THROUGH LATE WEEK...THOUGH HIGH TEMPERATURES ARE EXPECTED TO
REMAIN WELL BELOW RECORDS.
&&
.AVIATION...
SOUTH-CENTRAL ARIZONA INCLUDING KPHX...KIWA...AND KSDL...
CONSIDERABLE CLOUDS...MAINLY MID LEVEL OR HIGHER...CONTINUED TO
DEVELOP THIS EVENING AHEAD OF AN UPPER LOW MOVING EAST OUT OF SRN
CA. EXPECT BKN-OVC DECKS AOB 14K FEET REST OF TONIGHT AND INTO
FRIDAY MORNING WITH A FEW SCT DECKS TO 10K FEET. MAY SEE SOME VIRGA
AT TIMES...AND POSSIBLY SOME GUSTY VARIABLE OUTFLOW WINDS AS AS
RESULT OF THE VIRGA. CANNOT TIME OR FORECAST WHERE THESE MAY OCCUR
AND AS SUCH WILL NOT BE MENTIONED IN THE AREA TAFS...BUT POTENTIAL
IS THERE TO AFFECT THE AIRFIELDS INTO THE DAY FRIDAY. OTHERWISE
EXPECT WEST WINDS TO TRANSITION BACK TO THE SOUTHEAST AFTER MIDNIGHT
WITH SPEEDS MOSTLY AOB 8KT. BEST THREAT FOR ANY SHOWER TONIGHT OR
FRIDAY WILL STAY OVER THE HIGHER TERRAIN AREAS NORTH AND EAST OF
PHOENIX AND PRECIP IS NOT EXPECTED AT THE TAF SITES...EXCEPT FOR A
FEW VIRGA SPRINKLES AT TIMES.
SOUTHEAST CALIFORNIA AND SOUTHWEST ARIZONA INCLUDING KIPL AND KBLH...
WINDS WILL GENERALLY FAVOR WEST AT KIPL AND N TO NW AT KBLH
FOLLOWING WEAK FRONTAL PASSAGE...BUT SPEEDS SHOULD MOSTLY STAY AOB
12KT NEXT 24 HOURS. OTHERWISE...PERIODIC MID/HIGH CLOUDS ABOVE 15K
WILL GENERALLY CLEAR BY FRIDAY MORNING.
AVIATION DISCUSSION NOT UPDATED FOR AMENDED TAFS.
&&
.FIRE WEATHER...
SATURDAY THROUGH WEDNESDAY...
HIGH PRESSURE WILL BUILD EASTWARD INTO THE DESERT SOUTHWEST BRINGING
A WARMING TREND TO THE REGION INTO THE UPCOMING WEEKEND. BREEZY
CONDITIONS ARE EXPECTED ON SUNDAY AS A WEATHER SYSTEM SKIRTS BY JUST
TO THE EAST OF THE REGION. THE DRY CONDITIONS WILL PERSIST...BUT
EVEN DRIER AIR WILL SETTLE IN STARTING SATURDAY WITH MINIMUM
HUMIDITIES DROPPING INTO THE SINGLE DIGITS ACROSS THE LOWER DESERTS
SATURDAY THROUGH TUESDAY. NO MENTION OF PRECIPITATION CHANCES DURING
THIS TIME PERIOD.
&&
.PSR WATCHES/WARNINGS/ADVISORIES...
AZ...NONE.
CA...NONE.
&&
$$
VISIT US ON FACEBOOK...TWITTER...AND AT WEATHER.GOV/PHOENIX
DISCUSSION...HIRSCH
AVIATION...CB
FIRE WEATHER...CDEWEY
AREA FORECAST DISCUSSION
NWS DENVER/BOULDER CO
959 AM MDT FRI MAR 14 2014
.UPDATE...
&&
.SHORT TERM...OVERALL...CURRENT FORECASTS LOOK ON TRACK FOR TODAY
AS DRY NORTHWEST FLOW PREVAILS. WEAK UPPER LOW MOVES ACROSS NEW
MEXICO THIS AFTERNOON...ADVECTING SOME MID LEVEL MOISTURE INTO
SOUTHERN COLORADO. LATEST RAP GENERATES A FEW SHOWERS ACROSS PARK
COUNTY LATE THIS AFTERNOON AND EVENING. DESPITE LAPSE RATES AROUND
6 C/KM...LOOKS LIKE MOST OF THE MOISTURE WILL BE SOUTH OF THE
AREA. SO NO WEATHER OR POPS AT THIS TIME. DID DROP THE MENTION OF
PRECIPITATION ACROSS THE MOUNTAINS THIS EVENING. ALL MODEL CROSS
SECTIONS INDICATING ONLY HIGH LEVEL MOISTURE. BETTER MOISTURE
ADVECTION AFTER 06Z AS UPPER LEVEL TROUGH MOVES INTO THE GREAT
BASIN. CURRENT POPS/WEATHER FOR MOUNTAINS LOOKS REASONABLE.
.AVIATION...SOUTHERLY WINDS PREVAILING ACROSS AREA AIRPORTS.
LATEST MODELS SHOWING WINDS DECREASING BY 18Z WITH MORE OF A
SOUTHEAST TREND...EXCEPT WESTERLY AT KBJC. ADJUSTED THE TAFS A BIT
TO SHOW THIS TREND FOR THE AFTERNOON WITH DRAINAGE PREVAIL THIS
EVENING. OTHERWISE...CURRENT TAF TRENDS LOOK REASONABLE. VFR
THROUGH TONIGHT WITH UNLIMITED CEILINGS.
WINDS TO SHIFT TO THE NORTHWEST SATURDAY MORNING AHEAD OF AN
APPROACHING FRONT. AT THIS TIME THE FRONT LOOKS TO MOVE ACROSS THE
AREA AROUND 16Z WITH WINDS BECOMING MORE NORTHERLY. DOES NOT
APPEAR THERE WILL BE MUCH UPSLOPE AS LATEST MODELS CONTINUE TO
SHOW NORTHWEST WINDS PREVAILING DURING THE AFTERNOON. THERE COULD
BE SOME GUSTS TO 30 KTS DURING THE AFTERNOON. OTHERWISE...MID
LEVEL MOISTURE TO INCREASE THROUGH THE MORNING WITH CEILINGS
REMAINING ABOVE 12000 FEET AGL. SOME INCREASE IN LOW LEVEL
MOISTURE AFTER 18Z WITH POSSIBLE CEILINGS AROUND 7000 FEET AGL
ALONG WITH A FEW RAIN OR SNOW SHOWERS.
&&
.PREV DISCUSSION... /ISSUED 347 AM MDT FRI MAR 14 2014/
SHORT TERM...SUNNY SKIES EXPECTED AGAIN TODAY AS DRY AIR ADVECTS
ACROSS THE REGION. CROSS SECTIONS FROM THE NAM SHOW RELATIVE
HUMIDITIES AT OR LESS THAN 60 PERCENT THROUGH THE ENTIRE
ATMOSPHERE UNTIL AT LEAST 03Z. AFTER THAT...MOISTURE FROM THE NEXT
WEATHER DISTURBANCE BEGINS MOVING OVER NORTHWEST COLORADO.
PRESSURE GRADIENTS ACROSS THE STATE WILL BE LIGHT THROUGH THIS
EVENING...MEANING EVEN LESS WIND THAN YESTERDAY. MOISTURE AND
CLOUDINESS FROM THE WEAK UPPER LOW OVER ARIZONA AND NEW MEXICO IS
EXPECTED TO STAY OVER SOUTHWEST COLORADO AS THAT SYSTEM PROGRESSES
EASTWARD THROUGH SATURDAY MORNING.
IN THE FIRST 24 HOURS OF THE FORECAST THE ONLY PRECIPITATION THAT
IS MENTIONED IS OVER THE NORTHERN MOUNTAINS AFTER 06Z TONIGHT AS
THE LEADING EDGE OF TOMORROW/S WEATHER DISTURBANCE APPROACHES THE
STATE. THE MAIN IMPACT OF THIS SYSTEM WILL BE FELT DURING THE DAY
TOMORROW. TEMPERATURES ACROSS THE FORECAST AREA SHOULD BE
COMPARABLE TO WHAT WE SAW YESTERDAY.
LONG TERM...ANOTHER FAST MOVING UPPER LEVEL TROUGH WILL MOVE ACROSS
THE AREA ON SAT ALONG WITH A CDFNT. CROSS-SECTIONS SHOW DECENT
MOISTURE IN THE MTNS ALONG WITH FAVORABLE ORGRAPHICS ESPECIALLY
THRU EARLY AFTN. THUS SHOULD SEE AREAS OF SNOW ALONG WITH SOME
BLOWING SNOW. ACCUMULATIONS SHOULD BE GENERALLY IN THE 3 TO 6 INCH
RANGE ALTHOUGH A FEW SPOTS COULD REACH ADVISORY CRITERIA.
AT LOWER ELEVATIONS THE LOW LVL FLOW OVER NERN CO WILL BE MAINLY NNW
SO UPSLOPE COMPONENT WILL BE LACKING. HOWEVER COMBINATION OF SOME
MID LVL ASCENT AND DECENT LAPSE RATES MAY STILL ALLOW FOR A CHC OF
RAIN AND SNOW SHOWERS IN THE AFTN HOWEVER DO NOT EXPECT ANY
ACCUMULATIONS AT THIS TIME. WINDS WILL BE GUSTY WITH SPEEDS TO 40
MPH AT TIMES WHICH COULD PRODUCE SOME BLOWING DUST OVER THE
PLAINS. HIGHS ON SAT WILL OCCUR BEFORE NOON WITH READINGS IN THE
45 TO 50 DEGREE RANGE ACROSS NERN CO.
BY SAT EVENING THE UPPER LEVEL TROUGH WILL MOVE SE OF THE AREA WITH
DRIER AIR SPREADING ACROSS NRN CO. THUS PCPN SHOULD END BY EARLY
EVENING. FOR SUN DRY NNW FLOW ALOFT WILL BE OVER THE AREA. ONCE
AGAIN WILL SEE GUSTY WINDS AT TIMES OVER THE MTNS...FOOTHILLS AND
PLAINS. HIGHS ON SUN SHOULD RISE INTO THE 55 TO 60 DEGREE RANGE
OVER NERN CO.
FOR SUN NIGHT INTO MON THE FLOW ALOFT WILL GRADUALLY BECOME MORE WNW
AS A SFC LEE TROUGH INTENSIFIES EAST OF THE MTNS. WINDS WILL REMAIN
GUSTY AT TIMES IN THE MTNS AND FOOTHILLS AND ACROSS THE PLAINS
ESPECIALLY NR THE WY-NE BORDER. WITH DOWNSLOPE LOW LVL FLOW TEMPS
SHOULD WARM QUITE A BIT OVER NERN CO WITH READINGS IN THE MID 60S TO
LOWER 70S. SOME MOISTURE WILL INCREASE IN THE MTNS BY LATE AFTN
NORTH OF I-70 WHICH COULD LEAD TO A SLIGHT CHC OF SHOWERS.
BY MON NIGHT AND TUE THE ECMWF AND GFS NOW SHOW AN UPPER LEVEL
TROUGH AFFECTING THE AREA. THE GFS NOW HAS A STG UPPER LEVEL LOW
CLOSING OFF OVER ERN CO LATE MON NIGHT WHICH MOVES RAPIDLY INTO
CNTRL KANSAS BY 18Z TUE WHILE THE ECMWF HAS A MORE DIFFUSE LOOKING
TROUGH AFFECTING THE AREA FOR THE SAME TIME PERIOD. OVERALL SHOULD
SEE A GOOD CHC OF SNOW IN THE MTNS NO MATTER WHAT HAPPENS. OVER
NERN CO THE GFS SOLUTION WOULD LEAD TO A QUICK SHOT OF PCPN LATE
MON NIGHT INTO EARLY TUE MORNING OVER THE PLAINS WITH LESS OF A
CHC IN AND NR THE FOOTHILLS. MEANWHILE THE ECMWF WOULD ALLOW FOR A
BETTER CHC OF PCPN IN AND NR THE FOOTHILLS. FOR NOW WILL JUST KEEP
POPS IN THE SLIGHT CHC CATEGORY OVER NERN CO AND ADJUST
TEMPERATURES LOWER.
BY WED AND THU BOTH THE ECMWF AND GFS SHOW DRIER AIR SPREADING
ACROSS THE AREA IN WNW FLOW ALOFT SO WILL HAVE A DRY FCST WITH
A WARMING TREND.
AVIATION...NO AVIATION IMPACTS TODAY OR TONIGHT. SKIES WILL BE
CLEAR WITH JUST A LITTLE BIT OF HIGH CIRRUS AT TIMES. WINDS WILL
REMAIN LESS THAT 12 KTS THROUGH THE DAY AS THEY TREND TO WEST AND
SOUTHWESTERLY THROUGH THE LATE MORNING AND AFTERNOON.
&&
.BOU WATCHES/WARNINGS/ADVISORIES...
NONE.
&&
$$
SHORT TERM...D-L
LONG TERM....RPK
AVIATION...D-L
AREA FORECAST DISCUSSION
NWS CHARLESTON SC
1037 AM EDT FRI MAR 14 2014
.SYNOPSIS...
HIGH PRESSURE WILL PREVAIL THROUGH SATURDAY. A WARM FRONT WILL
LIFT INTO THE AREA SATURDAY NIGHT BEFORE A COMPLEX LOW PRESSURE
SYSTEM MOVES IN FROM THE WEST SUNDAY THROUGH MONDAY NIGHT. HIGH
PRESSURE WILL THEN BUILD OVER THE AREA DURING MID AND LATE WEEK.
&&
.NEAR TERM /UNTIL 6 PM THIS EVENING/...
A ZONAL FLOW WILL PERSIST ALOFT WHILE AT THE SURFACE A BROAD AREA
OF HIGH PRESSURE PUSHES INTO THE WESTERN ATLANTIC. THIS PATTERN
YIELDS INCREASING WARM ADVECTION IN THE LOW AND MID LEVELS WITH
SUNNY SKIES. LOW-LEVEL DEWPOINTS WILL RISE THROUGH THE DAY...
ESPECIALLY COASTAL SECTIONS WHERE WE COULD SEE SOME CUMULUS POP UP
LATER IN THE DAY. THICKNESS PROGS FROM THE LATEST RUC13 SUPPORT
THE EXISTING HIGH TEMPERATURE FORECAST SO WE MAINTAINED TEMPS IN
THE MID AND UPPER 60S TODAY.
&&
.SHORT TERM /6 PM THIS EVENING THROUGH MONDAY/...
TONIGHT...THE OVERALL SETUP WILL REMAIN LARGELY UNCHANGED. SOUTHERLY
FLOW WILL CONTINUE AROUND THE WEST SIDE OF THE ATLANTIC SURFACE HIGH
AND WE WILL BEGIN TO SEE INCREASING CLOUDS LATE IN THE EVENING AND
OVERNIGHT. MODELS ARE ALL IN GOOD AGREEMENT WITH SOME SHOWERS
DEVELOPING IN AN AREA OF CONVERGENCE OVER THE COASTAL WATERS
PRIMARILY AFTER MIDNIGHT. THIS ACTIVITY LOOKS AS THOUGH IT WILL
REMAIN ISOLATED AND REMAIN OVER THE ADJACENT COASTAL WATERS WHERE A
SMALL SLIVER OF SLIGHT CHANCE POPS HAS BEEN ADDED TO THE FORECAST.
OTHERWISE...LOWS WILL BE MUCH WARMER THURSDAY NIGHT. THE FORECAST
FEATURES MID 40S INLAND RANGING TO UPPER 40S/LOW 50S AT THE COAST.
SATURDAY...SOUTHERLY FLOW ALONG THE WESTERN EDGE OF HIGH PRESSURE
OFF THE SOUTHEAST COAST WILL LEAD TO A WARM DAY WELL AHEAD OF A
STRENGTHENING LOW PRESSURE SYSTEM OVER THE SOUTHERN PLAINS. THE
PATTERN WILL RESULT IN THE WARMEST TEMPS OF THE WEEKEND WITH
1000-850 MB THICKNESS VALUES SUPPORTING AFTERNOON HIGHS IN THE
MID/UPPER 70S OVER MOST AREAS AWAY FROM THE IMMEDIATE COAST. WEATHER
CONDITIONS SHOULD REMAIN DRY UNTIL A WARM FRONT LIFTS NORTH INTO THE
AREA LATE SATURDAY NIGHT...WITH DEEPENING MOISTURE AND ISENTROPIC
ASCENT. HOWEVER...THE BULK OF PRECIP IS EXPECTED TO REMAIN WEST OF
THE FORECAST AREA NEAR THE VICINITY OF THE DEEPENING SFC LOW. HAVE
THEREFORE MAINTAINED ONLY SLIGHT CHANCE POPS FOR A MAJORITY OF
SATURDAY NIGHT...THEN CHANCES INLAND LATE. OVERNIGHT TEMPS WILL
REMAIN MILD WITH WARM AIR ADVECTION IN PLACE ALONG WITH EXPANDING
CLOUD COVER. EXPECT LOW TEMPS IN THE LOW/MID 50S AWAY FROM THE
COAST.
SUNDAY THROUGH MONDAY...DEEP MOISTURE WILL CONTINUE TO ADVECT OVER
THE SOUTHEAST AHEAD OF A STRENGTHENING LOW PRESSURE SYSTEM TRACKING
FROM THE SOUTH CENTRAL UNITED STATES TO THE SOUTHEAST. EXPECT SOME
SHOWERS TO BREAK OUT BY SUNDAY AFTERNOON AS ENHANCED FORCING OCCURS
WITH A LOW LVL JET AHEAD OF A STRONG H5 SHORTWAVE DIGGING OVER THE
DEEP SOUTH. DESPITE SOUTH/SOUTHEAST FLOW AHEAD OF THE APPROACHING
LOW...TEMPS WILL BE SOMEWHAT LIMITED DUE TO CLOUD COVER OVER THE
AREA. AS A RESULT...PRECIP SHOULD REMAIN IN THE FORM OF SHOWERS
WHILE TEMPS PEAK INTO THE UPPER 60S TO AROUND 70.
PRECIP COVERAGE AND INTENSITY WILL LIKELY RAMP UP SUNDAY EVENING AND
PERSIST THROUGH MONDAY MORNING AS PWATS APPROACH 1.75 INCHES WHILE
ENHANCED FORCING OCCURS WITH THE STRONG H5 SHORTWAVE AND H25 JET
ALOFT. TEMPS WILL ALSO REMAIN MILD SUNDAY NIGHT...IN THE MID/UPPER
50S OVER MOST LOCATIONS. ALTHOUGH MOST INSTABILITY LOOKS TO REMAIN
SOUTH AND OFFSHORE...WE CAN NOT RULE OUT A FEW THUNDERSTORMS GIVEN
THE AMOUNT OF FORCING THAT OCCURS AS THE SYSTEM MAKES WAY TO THE
ATLANTIC. HAVE THEREFORE INTRODUCED SLIGHT CHANCES OF THUNDERSTORMS
ALONG WITH WIDESPREAD SHOWERS SUNDAY NIGHT INTO EARLY MONDAY. EXPECT
WIDESPREAD SHOWERS TO CONTINUE THROUGH MUCH OF MONDAY AS MOISTURE
LINGERS OVER THE AREA WHILE THE MID/UPPER LVL LOW SHIFTS OFFSHORE.
TEMPS WILL ALSO COOL OFF CONSIDERABLY THROUGHOUT THE DAY ON MONDAY
AS A NORTHERLY FLOW DEVELOPS ALONG THE BACK EDGE OF THE DEPARTING
LOW PRESSURE SYSTEM. MONDAY HIGHS COULD PEAK INTO THE LOW/MID 60S
EARLY...BEFORE COOLING OFF INTO THE MID/UPPER 50S OVER MOST
LOCATIONS BY MONDAY AFTERNOON.
&&
.LONG TERM /MONDAY NIGHT THROUGH THURSDAY/...
SHOWERS SHOULD BE ONGOING MONDAY NIGHT AS A LOW PRESSURE SYSTEM
SHIFTS OFFSHORE. NORTHERLY FLOW ALONG THE BACK EDGE OF THE DEPARTING
SYSTEM SHOULD RESULT IN COOLER OVERNIGHT LOWS...IN THE UPPER 30S TO
LOWER 40S. DRYER CONDITIONS SHOULD THEN RETURN OVER THE REGION BY
TUESDAY EVENING AND PERSIST INTO WEDNESDAY AS HIGH PRESSURE WEDGES
SOUTHWARD OVER THE AREA FOR A BRIEF PERIOD. TEMPS WILL STRUGGLE TO
WARM SIGNIFICANTLY UNDER THE WEDGE ON TUESDAY...BUT SHOULD GRADUALLY
WARM TO AROUND 70 ON WEDNESDAY AS THE WEDGE BREAKS DOWN DUE TO A
LARGE TROUGH OF LOW PRESSURE SHIFTING OVER THE MIDWEST. A WEAK/DRY
COLD FRONT COULD SHIFT THROUGH THE AREA ON THURSDAY...BUT HIGH
PRESSURE AND NEAR NORMAL TEMPS SHOULD PREVAIL OVER THE SOUTHEAST
INTO LATE WEEK.
&&
.AVIATION /15Z FRIDAY THROUGH TUESDAY/...
VFR CONDITIONS WILL PREVAIL AT KCHS AND KSAV THROUGH 12Z SATURDAY.
EXTENDED AVIATION OUTLOOK...VFR CIGS/VSBYS ARE EXPECTED AT BOTH
CHS AND SAV TERMINALS THROUGH SATURDAY. MVFR CIGS AND/OR VSBYS ARE
LIKELY SUNDAY AND MONDAY WITH SHOWERS AND LOW CLOUDS ASSOCIATED AS
A LOW PRESSURE SYSTEM SHIFTS OVER THE AREA. VFR CONDITIONS SHOULD
RETURN AT BOTH TERMINALS BY TUESDAY AFTERNOON AND PERSIST INTO THE
MIDDLE OF NEXT WEEK.
&&
.MARINE...
TODAY AND TONIGHT...TRANQUIL CONDITIONS ARE EXPECTED ACROSS THE
LOCAL WATERS UNDER THE INFLUENCE OF HIGH PRESSURE. FLOW WILL BE
NORTHEAST FOR A BRIEF TIME THIS MORNING BEFORE QUICKLY TURNING MORE
SOUTH AND SOUTHEASTERLY AS THE CENTER OF THE SURFACE HIGH SHIFTS OFF
THE EAST COAST. WINDS WILL GENERALLY BE AROUND 10 KTS OR
LESS...EXCEPT FOR UP TO 15 KTS ALONG THE LAND/SEA INTERFACE WHERE
SEA BREEZE WILL DEVELOP. SEAS WILL BE 1 TO 2 FT. OVERNIGHT...THE
FLOW WILL TURN A BIT MORE SOUTHWESTERLY AND INCREASE INTO THE
10-15 KT RANGE. SEAS WILL TICK UPWARD TO 2-3 FT.
SATURDAY THROUGH WEDNESDAY...WINDS/SEAS SHOULD REMAIN BELOW SMALL
CRAFT ADVISORY LEVELS THROUGH EARLY SUNDAY AS HIGH PRESSURE DOMINATES
OVER THE WATERS. WINDS/SEAS SHOULD THEN INCREASE/BUILD SUNDAY
AFTERNOON INTO MONDAY AS A DEEPENING LOW PRESSURE SYSTEM APPROACHES
FROM THE WEST AND SHIFTS OFF THE SOUTHEAST COAST. WE COULD SEE SMALL
CRAFT ADVISORY LEVEL CONDITIONS OVER OUTER GEORGIA WATERS AND
NORTHERN SC WATERS SUNDAY NIGHT AS A LOW LEVEL JET ASSOCIATED WITH
THIS SYSTEM SHIFTS OFFSHORE. 6 FT SEAS COULD LINGER OVER OUTER
GEORGIA WATERS INTO MUCH OF MONDAY AS WINDS BECOME NORTHERLY ALONG
THE BACK EDGE OF THE DEPARTING LOW PRESSURE SYSTEM. CONDITIONS
SHOULD THEN IMPROVE BY TUESDAY AS HIGH PRESSURE SETTLES OVER THE
WATERS THROUGH MID WEEK.
&&
.FIRE WEATHER...
RELATIVE HUMIDITY VALUES ARE EXPECTED TO FALL TO AROUND 25 PERCENT
FOR A FEW HOURS LATE THIS MORNING AND INTO EARLY AFTERNOON AWAY FROM
THE IMMEDIATE GEORGIA COAST. WINDS WILL INCREASE IN THE AFTERNOON
INTO THE 15 MPH RANGE OUT OF THE SOUTH AND SOUTHEAST. DEWPOINTS WILL
RECOVER IN THE LATE AFTERNOON AND RELATIVE HUMIDITY VALUES WILL RISE
TO ABOVE CRITICAL VALUES. WITH THIS COMBINATION OF LOW RELATIVE
HUMIDITIES AND ELEVATED WINDS...A FIRE DANGER STATEMENT WILL BE
ISSUED AFTER COORDINATION WITH SURROUNDING OFFICES.
&&
.CHS WATCHES/WARNINGS/ADVISORIES...
GA...NONE.
SC...NONE.
MARINE...NONE.
&&
$$
SYNOPSIS...
NEAR TERM...JRL
SHORT TERM...DPB
LONG TERM...DPB
AVIATION...DPB/JAQ
MARINE...BSH/DPB
FIRE WEATHER...
AREA FORECAST DISCUSSION
NWS POCATELLO ID
906 AM MDT FRI MAR 14 2014
.UPDATE...PACIFIC SHORTWAVE AXIS HAS REACHED COAST PER SAT
IMAGERY. REGIONAL RADAR MOSAIC ALONG WITH SURFACE OBS SHOW PRECIP
ALREADY FALLING IN NORTHEAST OREGON. TIMING OF FEATURES HOLD OFF
ON PRECIP UNTIL AFTERNOON FOR CENTRAL MOUNTAINS SO WILL MAINTAIN
ZERO POPS UNTIL AFTER 18Z. SURFACE DEWPOINTS QUITE DRY SO EXPECT
IT WILL TAKE QUITE A BIT FOR PRECIP TO MOISTEN LOWER LEVELS. THIS
CONCEPT SHOWN NICELY IN RECENT HRRR AND RUC PRECIP FIELDS. BELIEVE
CURRENT FORECAST PRECIP GRIDS IN EXCELLENT SHAPE WITH MODERATE POP
AND LOW QPF. COLD FRONT PASSAGE STILL EXPECTED THIS EVENING WITH
GUSTY WINDS ALONG AND BEHIND THE FRONT. NO UPDATES ANTICIPATED
THIS MORNING. DMH
&&
.PREV DISCUSSION... /ISSUED 302 AM MDT FRI MAR 14 2014/
SHORT TERM...TODAY THROUGH SUNDAY NIGHT.
WEAK PACIFIC TROF WILL MOVE TO THE NORTH OF THE REGION THIS
EVENING AND BRING IN SOME VERY LIGHT PRECIPITATION TO THE CENTRAL
MOUNTAINS AND EASTERN HIGHLANDS MAINLY THROUGH THIS EVENING.
GENERALLY AT MOST 1 TO 2 INCHES EXPECTED IN HIGH ELEVATIONS
THROUGH TONIGHT. EXPECT DRY CONDITIONS SATURDAY THROUGH SUNDAY
NIGHT BEHIND THAT SYSTEM AND AHEAD OF THE NEXT STRONGER ONE
MONDAY. EXPECT SOME BREEZY CONDITIONS LATER THIS AFTERNOON AND
EVENING AS THE TROF AND WEAK COLD FRONT MOVES THROUGH THE REGION.
EXPECT WELL ABOVE NORMAL TEMPERATURES THROUGH SUNDAY.
GK
LONG TERM...MONDAY THROUGH NEXT THURSDAY. THE ECMWF AND GFS HAVE
COME INTO AGREEMENT ABOUT A SIGNIFICANT TROUGH ON MONDAY AND MONDAY
NIGHT. PRECIPITATION AMOUNTS ALSO LOOK GREATER...PARTICULARLY
IN THE GFS. SNOW ACCUMULATION IN THE CENTRAL MOUNTAINS AND EASTERN
HIGHLANDS COULD BE 2 TO 5 INCHES ABOVE 6000 FEET. VERY STRONG WINDS
IN THE SNAKE PLAIN STILL SUGGESTED BY THE MODELS MONDAY
AFTERNOON...ABOUT 3 STANDARD DEVIATIONS ABOVE NORMAL...14/00Z GFS MOS UP TO
48KTS AT POCATELLO. THIS COULD BE AN OVER ESTIMATE BUT THIS REALLY
NEEDS TO BE WATCHED. BOTH THE GFS AND ECMWF SHOW SOME REALLY STRONG
COLD AIR ADVECTION WITH THIS DISTURBANCE...SOURCE AREA LOOKS TO BE
THE LOW IN THE BERING SEA WHERE UPPER AIR OBSERVATION NEAR PAUL
ISLAND REPORTED -31C TEMPERATURE NEAR 700 MB LEVEL THIS AFTERNOON.
GFS SURFACE PRESSURE GRADIENT ACROSS SOUTHEAST IDAHO MONDAY
AFTERNOON IS MUCH HIGHER THAN THE ECMWF. IF IT PANNED OUT...COLD AIR
ADVECTION AND SURFACE PRESSURE GRADIENT COULD DRIVE WINDS TO HIGH
WIND WARNING LEVEL. COLDER TEMPERATURES BEHIND THE MONDAY COLD
FRONT WILL DROP SNOW LEVELS AND RETURN THE SNAKE RIVER PLAIN TO
BELOW FREEZING AT NIGHT. MODELS AR SHOWING MORE CONSENSUS ON HIGH
PRESSURE RIDGE MOVING THROUGH THIS ARA TUESDAY NIGHT AND
WEDNESDAY...CHANCE OF PRECIPITATION WAS LOWERED QUITE A BIT. COULD
BE FRIDAY OR SATURDAY BEFORE THE NEXT DISTURBANCE ARRIVES. RS
AVIATION...INCREASING MIDDLE AND UPPER CLOUDS THIS MORNING AHEAD OF
AN APPROACHING COLD FRONT. FRONT SHOULD REACH KSUN 22-23Z AND KPIH
00-01Z. SNAKE PLAIN WINDS SOUTHWEST 15 TO 25 KTS GUST 35 BETWEEN 21Z
AND 03Z. SCATTERED SHOWERS NEAR AND A COUPLE-THREE HOURS BEHIND
FRONTAL PASSAGE. SNOW LEVELS THIS AFTERNOON NEAR 6400 FEET AT KBYI
SLOPING TO ABOUT 5800 FEET AT KIDA...DROPPING TO 5700 TO 5200 FEET
BEHIND THE FRONT. WIDESPREAD VFR SATURDAY UNDER TRANSITORY HIGH
PRESSURE RIDGE. RS
&&
.PIH WATCHES/WARNINGS/ADVISORIES...
NONE.
&&
$$
AREA FORECAST DISCUSSION
NWS GRAND RAPIDS MI
1103 AM EDT FRI MAR 14 2014
LATEST UPDATE...
UPDATE
.SYNOPSIS...
ISSUED AT 321 AM EDT FRI MAR 14 2014
BREEZY SOUTHWEST WINDS WILL PUSH TEMPERATURES INTO THE 40S TODAY FOR
MOST LOCATIONS. THE WARMER AIR WILL BE SHORT LIVED THOUGH AS A COLD
FRONT WILL DROP SOUTH THROUGH THE AREA THIS AFTERNOON AND EARLY
EVENING. THE COLD FRONT MAY LEAD TO SOME SCATTERED RAIN SHOWERS. A
REINFORCING COLD FRONT PASSES THROUGH OVERNIGHT WITH SOME SPRINKLES
CHANGING OVER TO A FEW FLURRIES. COLDER AIR WILL CONTINUE TO FILTER
INTO THE GREAT LAKES OVER THE WEEKEND AS ARCTIC HIGH PRESSURE
SETTLES INTO THE REGION. HIGHS WILL ONLY REACH THE 30S ON SATURDAY
AND THE 20S ON SUNDAY. DRY WEATHER IS FORECAST OVER THE WEEKEND DUE
TO THE AREA OF HIGH PRESSURE. THE NEXT WEATHER MAKER FOR SOUTHWEST
LOWER MICHIGAN WILL COME NEXT TUESDAY NIGHT INTO WEDNESDAY BRINGING
A CHANCE FOR RAIN AND SNOW.
&&
.UPDATE...
ISSUED AT 1103 AM EDT FRI MAR 14 2014
I INCREASED THE FORECAST HIGH TEMPERATURE TO THE UPPER 40S TO NEAR
50 AS A LOOK AT BOTH THE DTX AND MADIS ACARS GRR SOUNDINGS SHOW A
VERY STRONG INVERSION WITH TEMPERATURES AROUND 50F AT 3200 FT AGL
AT 8 AM. LITTLE QUESTION WITH THE MIXING ASSOCIATED WITH THE COLD
FRONT TEMPS WILL RISE TO NEAR 50 OVER THE AREA... EVEN WITH THE
SNOW COVER.
AS FOR PRECIPITATION THERE ARE SOME ECHOES ON RADAR NORTH OF
LUDINGTON AND THE HRRR SHOWS THEM MOVING EAST SOUTHEAST WITH THE
COLD FRONT THIS AFTERNOON. THE BAND SHOULD CROSS THE CWA DURING
THE AFTERNOON...REACHING EASTERN AREAS BY 4 PM OR SO.
TONIGHT THE RH IN THE LOWER 5000 FT IS ABOVE 90 PCT AND THERE IS
SOME LIFT... SO I EXPECT WE WILL SEE SOME LIGHT SHOWERS CHANGING
TO LIGHT SNOW SHOWERS AFTER MIDNIGHT. NONE OF THE PRECIPITATION
TODAY WILL AMOUNT TO ANYTHING SIGNIFICANT.
&&
.SHORT TERM...(TODAY THROUGH SUNDAY)
ISSUED AT 321 AM EDT FRI MAR 14 2014
LIMITED WEATHER CONCERNS EXIST IN THE SHORT TERM...BUT PERTAIN TO
CHANCES FOR PRECIPITATION TODAY AND TONIGHT. WE HAVE A DRY FORECAST
FOR SATURDAY THROUGH SUNDAY AS HIGH PRESSURE GRADUALLY SAGS SOUTH
INTO THE GREAT LAKES.
FOR TODAY...MODELS ARE FORECASTING THE COLD FRONT TO DROP SOUTH
THROUGH THE AREA THIS AFTERNOON AND EVENING. THE HRRR AND RAP HI-RES
SHORT TERM MODELS BOTH SHOW PRECIPITATION IN A NARROW RIBBON ALONG
THE COLD FRONT. HAVE 30 PCT CHC POPS NORTH AND 20 PCT SOUTH FOR THIS
AFTERNOON. IT APPEARS THERE WILL BE JUST ENOUGH DEPTH TO THE
MOISTURE FOR THIS TO OCCUR. TEMPS SHOULD NOSE INTO THE MIDDLE 40S
FOR HIGHS. READINGS ARE ALREADY AROUND 40 AT THIS TIME OF NIGHT
ACROSS SRN WI AND NRN IL WHICH IS OUR SOURCE REGION TODAY.
IT WILL BE BREEZY TODAY AS SOUTHWEST WINDS OF 15 TO 30 MPH CAN BE
EXPECTED. GUSTS IN EXCESS OF 30 MPH ARE A GOOD BET. A LLJ ON THE
ORDER OF 50 KNOTS OR SO WILL SWING THROUGH THE FORECAST AREA THIS
MORNING. HOLLAND IS ALREADY SEEING STRONG WINDS GUSTING TO 29 KNOTS.
TONIGHT...A SECONDARY COLD FRONT PASSES SOUTH THROUGH THE AREA AND
ENVISION A FEW SPRINKLES OR FLURRIES AROUND. HAVE MINIMAL POPS IN
TONIGHT...20 PCT...TO COVER THE LIGHT PRECIP. 850MB TEMPS BY
MORNING WILL HAVE FALLEN BACK TO -5 TO -10C FROM +7C THIS MORNING.
DRY WEATHER FORECAST FOR SATURDAY THROUGH SUNDAY BUT WE WILL NEED TO
KEEP AN EYE ON A BAROCLINIC ZONE THAT SETS UP ACROSS THE SOUTHERN
GREAT LAKES ON SATURDAY EVENING. MODELS HAVE SOME PRECIP
NEARBY...BUT JUST FEEL WE ARE GOING TO BE TOO DRY TO SQUEEZE
ANYTHING OUT.
.LONG TERM...(SUNDAY NIGHT THROUGH THURSDAY)
ISSUED AT 321 AM EDT FRI MAR 14 2014
FAIR WEATHER IS EXPECTED SUNDAY NIGHT THROUGH EARLY NEXT WEEK WITH A
RIDGE IN CONTROL OF THE WX PATTERN. TEMPS IN THIS TIME FRAME WILL BE
UNSEASONABLY COLD SUNDAY NIGHT AND MONDAY BEFORE UNDERGOING A
GRADUAL MODERATING TREND TUESDAY INTO WEDNESDAY AS SOUTHERLY FLOW
WAA DEVELOPS OUT AHEAD OF THE NEXT SYSTEM.
A FAIRLY STRONG LOW PRESSURE SYSTEM IS EXPECTED TO TRACK NE ACROSS
OUR REGION TOWARD THE MIDDLE OF NEXT WEEK BRINGING POTENTIAL FOR A
MIX OF RAIN AND SNOW TUESDAY NIGHT THROUGH WEDNESDAY. ANOTHER SHOT
OF COOLER AIR WILL LIKELY MOVE IN BEHIND THAT SYSTEM LATE IN THE
WEEK WITH POTENTIAL FOR SOME LINGERING LIGHT SNOW SHOWERS OR
FLURRIES INTO THURSDAY.
&&
.AVIATION...(FOR THE 12Z TAFS THROUGH 12Z SATURDAY MORNING)
ISSUED AT 735 AM EDT FRI MAR 14 2014
MAIN STORY TODAY WILL BE THE WIND...WHICH WILL PEAK THIS MORNING
THROUGH EARLY AFTERNOON. SOUTHWEST WINDS OF 15 TO 30 KNOTS CAN BE
EXPECTED. SOME WIND SHEAR WILL BE SEEN AS WELL GIVEN WINDS AT
2000FT FROM 240 AROUND 50 KNOTS. THE WINDS WILL REMAIN UP THIS
AFTERNOON...BUT BACK OF SLIGHTLY TO 15-25 KNOTS. THE CORE OF WINDS
AT 2000FT SHOULD DECREASE A BIT TO NEAR 35 KNOTS.
CLOUDS WILL LOWER AND THICKEN TODAY...BUT BASES WILL REMAIN VFR AT
LEAST THROUGH ABOUT 22Z. AROUND 00Z...MVFR CEILINGS SHOULD SWEEP
IN FROM THE NORTH AND NORTHWEST WITH AN MVFR DECK AROUND 1500FT
EXPECTED THROUGH THE NIGHT.
SOME SHOWERS WILL MOVE THROUGH THE AREA THIS AFTERNOON...BUT NOT
EXPECTING MUCH IN THE WAY OF RESTRICTION TO VISIBILITY. THE
SHOWERS WILL BE SCATTERED IN NATURE AS WELL.
&&
.HYDROLOGY...
ISSUED AT 323 PM EDT THU MAR 13 2014
THE PERIODS OF WARMER TEMPERATURE WITH LIMITED RAIN MIXED WITH COLD
SNAPS OF LATE HAS RESULTED IN A DECREASE IN ICE DEPTH ON RIVERS AND
HAS DECREASED THE MOISTURE TRAPPED IN THE SNOW PACK. CURRENT SNOW
WATER EQUIVALENT VALUES ARE GENERALLY IN THE 2 TO 4 INCH RANGE. THIS
WEATHER PATTERN IS EXPECTED TO CONTINUE THROUGH THE NEXT WEEK...
WHICH SHOULD LOWER THE CHANCES FOR ICE JAM FORMATION AND FLOODING AS
WE PROGRESS INTO SPRING.
&&
.GRR WATCHES/WARNINGS/ADVISORIES...
MI...NONE.
LM...NONE.
&&
$$
UPDATE...WDM
SYNOPSIS...DUKE
SHORT TERM...DUKE
LONG TERM...LAURENS
AVIATION...DUKE
HYDROLOGY...63
AREA FORECAST DISCUSSION
NWS GRAND RAPIDS MI
736 AM EDT FRI MAR 14 2014
LATEST UPDATE...
AVIATION
.SYNOPSIS...
ISSUED AT 321 AM EDT FRI MAR 14 2014
BREEZY SOUTHWEST WINDS WILL PUSH TEMPERATURES INTO THE 40S TODAY FOR
MOST LOCATIONS. THE WARMER AIR WILL BE SHORT LIVED THOUGH AS A COLD
FRONT WILL DROP SOUTH THROUGH THE AREA THIS AFTERNOON AND EARLY
EVENING. THE COLD FRONT MAY LEAD TO SOME SCATTERED RAIN SHOWERS. A
REINFORCING COLD FRONT PASSES THROUGH OVERNIGHT WITH SOME SPRINKLES
CHANGING OVER TO A FEW FLURRIES. COLDER AIR WILL CONTINUE TO FILTER
INTO THE GREAT LAKES OVER THE WEEKEND AS ARCTIC HIGH PRESSURE
SETTLES INTO THE REGION. HIGHS WILL ONLY REACH THE 30S ON SATURDAY
AND THE 20S ON SUNDAY. DRY WEATHER IS FORECAST OVER THE WEEKEND DUE
TO THE AREA OF HIGH PRESSURE. THE NEXT WEATHER MAKER FOR SOUTHWEST
LOWER MICHIGAN WILL COME NEXT TUESDAY NIGHT INTO WEDNESDAY BRINGING
A CHANCE FOR RAIN AND SNOW.
&&
.SHORT TERM...(TODAY THROUGH SUNDAY)
ISSUED AT 321 AM EDT FRI MAR 14 2014
LIMITED WEATHER CONCERNS EXIST IN THE SHORT TERM...BUT PERTAIN TO
CHANCES FOR PRECIPITATION TODAY AND TONIGHT. WE HAVE A DRY FORECAST
FOR SATURDAY THROUGH SUNDAY AS HIGH PRESSURE GRADUALLY SAGS SOUTH
INTO THE GREAT LAKES.
FOR TODAY...MODELS ARE FORECASTING THE COLD FRONT TO DROP SOUTH
THROUGH THE AREA THIS AFTERNOON AND EVENING. THE HRRR AND RAP HI-RES
SHORT TERM MODELS BOTH SHOW PRECIPITATION IN A NARROW RIBBON ALONG
THE COLD FRONT. HAVE 30 PCT CHC POPS NORTH AND 20 PCT SOUTH FOR THIS
AFTERNOON. IT APPEARS THERE WILL BE JUST ENOUGH DEPTH TO THE
MOISTURE FOR THIS TO OCCUR. TEMPS SHOULD NOSE INTO THE MIDDLE 40S
FOR HIGHS. READINGS ARE ALREADY AROUND 40 AT THIS TIME OF NIGHT
ACROSS SRN WI AND NRN IL WHICH IS OUR SOURCE REGION TODAY.
IT WILL BE BREEZY TODAY AS SOUTHWEST WINDS OF 15 TO 30 MPH CAN BE
EXPECTED. GUSTS IN EXCESS OF 30 MPH ARE A GOOD BET. A LLJ ON THE
ORDER OF 50 KNOTS OR SO WILL SWING THROUGH THE FORECAST AREA THIS
MORNING. HOLLAND IS ALREADY SEEING STRONG WINDS GUSTING TO 29 KNOTS.
TONIGHT...A SECONDARY COLD FRONT PASSES SOUTH THROUGH THE AREA AND
ENVISION A FEW SPRINKLES OR FLURRIES AROUND. HAVE MINIMAL POPS IN
TONIGHT...20 PCT...TO COVER THE LIGHT PRECIP. 850MB TEMPS BY
MORNING WILL HAVE FALLEN BACK TO -5 TO -10C FROM +7C THIS MORNING.
DRY WEATHER FORECAST FOR SATURDAY THROUGH SUNDAY BUT WE WILL NEED TO
KEEP AN EYE ON A BAROCLINIC ZONE THAT SETS UP ACROSS THE SOUTHERN
GREAT LAKES ON SATURDAY EVENING. MODELS HAVE SOME PRECIP
NEARBY...BUT JUST FEEL WE ARE GOING TO BE TOO DRY TO SQUEEZE
ANYTHING OUT.
.LONG TERM...(SUNDAY NIGHT THROUGH THURSDAY)
ISSUED AT 321 AM EDT FRI MAR 14 2014
FAIR WEATHER IS EXPECTED SUNDAY NIGHT THROUGH EARLY NEXT WEEK WITH A
RIDGE IN CONTROL OF THE WX PATTERN. TEMPS IN THIS TIME FRAME WILL BE
UNSEASONABLY COLD SUNDAY NIGHT AND MONDAY BEFORE UNDERGOING A
GRADUAL MODERATING TREND TUESDAY INTO WEDNESDAY AS SOUTHERLY FLOW
WAA DEVELOPS OUT AHEAD OF THE NEXT SYSTEM.
A FAIRLY STRONG LOW PRESSURE SYSTEM IS EXPECTED TO TRACK NE ACROSS
OUR REGION TOWARD THE MIDDLE OF NEXT WEEK BRINGING POTENTIAL FOR A
MIX OF RAIN AND SNOW TUESDAY NIGHT THROUGH WEDNESDAY. ANOTHER SHOT
OF COOLER AIR WILL LIKELY MOVE IN BEHIND THAT SYSTEM LATE IN THE
WEEK WITH POTENTIAL FOR SOME LINGERING LIGHT SNOW SHOWERS OR
FLURRIES INTO THURSDAY.
&&
.AVIATION...(FOR THE 12Z TAFS THROUGH 12Z SATURDAY MORNING)
ISSUED AT 735 AM EDT FRI MAR 14 2014
MAIN STORY TODAY WILL BE THE WIND...WHICH WILL PEAK THIS MORNING
THROUGH EARLY AFTERNOON. SOUTHWEST WINDS OF 15 TO 30 KNOTS CAN BE
EXPECTED. SOME WIND SHEAR WILL BE SEEN AS WELL GIVEN WINDS AT
2000FT FROM 240 AROUND 50 KNOTS. THE WINDS WILL REMAIN UP THIS
AFTERNOON...BUT BACK OF SLIGHTLY TO 15-25 KNOTS. THE CORE OF WINDS
AT 2000FT SHOULD DECREASE A BIT TO NEAR 35 KNOTS.
CLOUDS WILL LOWER AND THICKEN TODAY...BUT BASES WILL REMAIN VFR AT
LEAST THROUGH ABOUT 22Z. AROUND 00Z...MVFR CEILINGS SHOULD SWEEP
IN FROM THE NORTH AND NORTHWEST WITH AN MVFR DECK AROUND 1500FT
EXPECTED THROUGH THE NIGHT.
SOME SHOWERS WILL MOVE THROUGH THE AREA THIS AFTERNOON...BUT NOT
EXPECTING MUCH IN THE WAY OF RESTRICTION TO VISIBILITY. THE
SHOWERS WILL BE SCATTERED IN NATURE AS WELL.
&&
.HYDROLOGY...
ISSUED AT 323 PM EDT THU MAR 13 2014
THE PERIODS OF WARMER TEMPERATURE WITH LIMITED RAIN MIXED WITH COLD
SNAPS OF LATE HAS RESULTED IN A DECREASE IN ICE DEPTH ON RIVERS AND
HAS DECREASED THE MOISTURE TRAPPED IN THE SNOW PACK. CURRENT SNOW
WATER EQUIVALENT VALUES ARE GENERALLY IN THE 2 TO 4 INCH RANGE. THIS
WEATHER PATTERN IS EXPECTED TO CONTINUE THROUGH THE NEXT WEEK...
WHICH SHOULD LOWER THE CHANCES FOR ICE JAM FORMATION AND FLOODING AS
WE PROGRESS INTO SPRING.
&&
.GRR WATCHES/WARNINGS/ADVISORIES...
MI...NONE.
LM...NONE.
&&
$$
SYNOPSIS...DUKE
SHORT TERM...DUKE
LONG TERM...LAURENS
AVIATION...DUKE
HYDROLOGY...63
AREA FORECAST DISCUSSION
NWS NORTH PLATTE NE
929 AM CDT FRI MAR 14 2014
.UPDATE...
ISSUED AT 925 AM CDT FRI MAR 14 2014
THE HOURLY RAPID REFRESH MODELS ARE INDICATING MUCH LOWER
DEWPOINTS IN THE WESTERN NEBRASKA SANDHILLS AND THE EASTERN
PANHANDLE THAN THE STATISTICAL OUTPUT IS. AS A RESULT...WE ARE
UPDATING THE DEWPOINT AND RELATIVE HUMIDITY GRIDS FOR LOWER
VALUES...THOUGH NOT QUITE TO THE SINGLE DIGIT DEWPOINTS INDICATED
BY THE HRRR AND RAP13 SHORT TERM MODELS.
&&
.SHORT TERM...(TODAY AND TONIGHT)
ISSUED AT 358 AM CDT FRI MAR 14 2014
A COLD FRONT PUSHED THROUGH THE AREA YESTERDAY AND CURRENTLY IS
DRAPED FROM SOUTHERN MN THROUGH EASTERN NE AND ALONG THE WESTERN
KS/NE BORDER. WINDS BEHIND THE FRONT HAVE BEEN GENERALLY 10-15 MPH
EARLY THIS MORNING. HOWEVER...EXPECT THE WINDS TO INCREASE QUICKLY
IN THE FAR EAST /ONEILL AREA/ ONCE THE SUN COMES UP. EXPECT THE
STRONGEST WINDS IN THE MORNING TO EARLY AFTERNOON PERIOD BEFORE
DECREASING IN THAT AREA. OTHERWISE...PRESSURE GRADIENT DECREASES
ACROSS THE ENTIRE AREA TODAY AS HIGH PRESSURE FILLS IN BEHIND THE
COLD FRONT. EXPECT SKIES TO BE MOSTLY SUNNY TODAY WITH SOME
INCREASING CLOUD COVER TONIGHT AHEAD OF THE NEXT SYSTEM. HAVE GONE
A LITTLE ABOVE GUIDANCE WITH HIGHS FOR TODAY...CLOSER TO THE BIAS
CORRECTED DATA. DRY CONDITIONS AND GUSTY WINDS IN THE EAST WILL
MAKE FIRE DANGER ELEVATED TODAY...MORE DETAILS IN THE FIRE WX
DISCUSSION.
.LONG TERM...(SATURDAY THROUGH THURSDAY)
ISSUED AT 358 AM CDT FRI MAR 14 2014
CONCERNS THROUGH THIS FORECAST PERIOD ARE WITH PRECIPITATION
CHANCES/TEMPERATURES SATURDAY AND SATURDAY NIGHT...THEN FOCUS TURNS
TO A STORM SYSTEM SET TO MOVE ACROSS THE CENTRAL CONUS FOR THE FIRST
HALF OF THE NEXT WORK WEEK.
A SHORTWAVE TROUGH...NOW OFF THE BRITISH COLUMBIA COAST WILL MOVE
INLAND TODAY...THEN WILL DIG DOWN INTO THE BROAD TROUGH SITUATED
OVER THE CENTRAL AND EASTERN CONUS. THE MODELS ARE IN GOOD AGREEMENT
WITH HAVING TWO SEPARATE PIECES OF ENERGY AS THE SYSTEM MOVES INTO
THE PLAINS. THE FIRST DROPS IN ACROSS WESTERN SOUTH DAKOTA AND INTO
EASTERN NEBRASKA...WHILE THE SECOND IS FURTHER SOUTH AND MOVES DOWN
INTO THE SOUTHERN PLAINS. MODELS HAVE TRENDED A BIT QUICKER BRINGING
THE COLD FRONT THROUGH ON SATURDAY AS IT IS NOW THROUGH THE FORECAST
AREA BY MID MORNING. AS THERE IS GOOD AGREEMENT WITH THIS...HAVE
ADJUSTED TEMPERATURES DOWN A FEW DEGREES. ALSO INCREASED WINDS ON
SATURDAY BEHIND THE FRONT. THE PRESSURE GRADIENT TIGHTENS UP AND
FORECAST SOUNDINGS SHOWING GOOD MIXING TO 750MB WITH WINDS AT THAT
LEVEL UP AROUND 30KTS.
LOOKING AT PRECIPITATION CHANCES...THERE IS GOOD LARGE-SCALE LIFT
ACROSS THE AREA BEGINNING SATURDAY...WITH THE STRONGEST LIFT SEEN
OVER NORTHERN NEBRASKA FROM SATURDAY AFTERNOON INTO THE EVENING
HOURS. THEN LOOKING AT MOISTURE PROFILES...CROSS SECTIONS SHOW
SIGNIFICANT MOISTURE OVER NORTHWEST NEBRASKA BY MID-DAY SATURDAY AND
INCREASES THROUGH THE DAY. HOWEVER THERE IS A SUBSTANTIAL DRY LAYER
BELOW 800MB THAT PRESENTS AN ISSUE FOR MEASURABLE PRECIPITATION. THE
LOW LEVELS DO EVENTUALLY SATURATE...BUT NOT UNTIL AFTER 00Z SUNDAY
IN MOST LOCATIONS. WITH THE AMOUNT OF LIFT...WILL LIKELY BE SEEING
PRECIPITATION BY EARLY AFTERNOON OVER NORTHWEST NEBRASKA THEN
SPREADING EAST...JUST HOW MUCH ACCUMULATES IS IN QUESTION. AND...THE
PRECIPITATION TYPE OF WHAT REACHES THE GROUND IS ALSO QUESTIONABLE.
SURFACE TEMPERATURES STAY ABOVE FREEZING THROUGHOUT THE DAY SATURDAY
BUT THE WET-BULB PROFILE WOULD SUGGEST THERE COULD BE SNOW.
THEREFORE WENT WITH A RAIN/SNOW MENTION FOR THE DAYTIME HOURS.
COLDER AIR MOVES IN DURING THE EVENING AND OVERNIGHT HOURS AND AS
THE COLUMN SATURATES CHANGED EVERYTHING OVER TO SNOW AFTER MIDNIGHT.
THE NEXT SYSTEM OF CONCERN MOVES OUT OF THE NORTHERN PACIFIC SUNDAY
AND INTO THE PACIFIC NORTHWEST SUNDAY NIGHT. MODELS ARE FINALLY
STARTING TO COME INTO SOME AGREEMENT WITH HOW THIS SYSTEM WILL
PROGRESS ACROSS THE WESTERN AND CENTRAL PARTS OF THE CONUS...SO
CONFIDENCE IS STARTING TO INCREASE FOR THE EARLY PARTS OF NEXT WEEK.
THAT BEING SAID...THERE ARE STILL DIFFERENCES IN THE STRENGTH OF THE
SYSTEM WITH THE MODEL THAT IS STRONGEST BEING THE OUTLIER. FOR THIS
FORECAST CYCLE KEPT THE FORECAST TRENDED TOWARDS THE MORE CONSISTENT
SOLUTION...WHICH FOLLOWS THE ECMWF AND GEM.
THE SHORTWAVE TROUGH MOVES INTO THE NORTHERN US ROCKIES BY THE END
OF THE DAY MONDAY...WHILE SURFACE CYCLOGENESIS DEVELOPS A BROAD
SURFACE LOW FROM EASTERN MONTANA/WYOMING INTO EASTERN COLORADO. THIS
WILL BRING ABOUT GOOD WARM AIR ADVECTION IN THE LOW LEVELS...AND
WITH A STRONG THERMAL RIDGE ALOFT 850MB TEMPERATURES ARE VERY WARM
AT 10C TO 18C ACROSS PARTS OF THE AREA /DEPENDENT ON THE MODEL/.
AGAIN...WITH THE MODEL DIFFERENCES HAVE NOT JUMPED ON THE EXTREMELY
WARM SOLUTIONS BUT IF THEY CONTINUE TO COME INTO BETTER AGREEMENT
MAY NEED TO DO FURTHER ADJUSTING UP ON HIGH TEMPERATURES MONDAY.
WARMER TEMPERATURES WOULD LIKELY LEAD TO DEEP MIXING AND COULD BRING
DRIER AIR AND STRONGER WINDS TO THE SURFACE. MONDAY WILL NEED TO BE
MONITORED IN THE COMING DAYS FOR THE POTENTIAL FOR BEING A CRITICAL
FIRE WEATHER DAY.
THEN LOOKING TO TUESDAY...THE UPPER LOW CROSSES THE
PLAINS...BRINGING A STRONG COLD FRONT ACROSS THE AREA...AND THUS
LEADING TO PRECIPITATION CHANCES AND STRONG NORTHWEST WINDS ACROSS
THE FORECAST AREA. THE MODEL DIFFERENCES RANGE FROM THE UPPER LOW
MOVING ACROSS SOUTH DAKOTA/NEBRASKA FROM THE ECMWF/GEM TO THE GFS
SHOWING THE LOW CROSSING KANSAS. THESE DIFFERENT SOLUTIONS LEAD TO
VERY DIFFERENT SENSIBLE WEATHER...ALTHOUGH BOTH WOULD BE COOLER
ALONG WITH CHANCES FOR PRECIPITATION. AGAIN...KEPT WITH THE MORE
CONSISTENT SOLUTION AND DIDN/T BUY INTO THE GFS AT THIS TIME. FOR
NOW...HAVE THE HIGHER CHANCES FOR PRECIPITATION DURING THE DAY
TUESDAY...WITH STRONG SUBSIDENCE MOVING IN TUESDAY NIGHT TO QUICKLY
PUSH ANY PRECIPITATION EAST OF THE AREA. PRECIPITATION TYPE IS
RAIN/SNOW IN THE CURRENT FORECAST AS SURFACE TEMPERATURES ARE
LOOKING TO BE IN THE UPPER 30S TO LOW 40S...YET DYNAMIC COOLING
COULD CHANGE PRECIPITATION TO SNOW.
BEYOND TUESDAY NIGHT...THE PATTERN KEEPS COOLER AIR ACROSS THE AREA
WITH NO SIGNIFICANT SYSTEMS TO MOVE OVER THE REGION THROUGH THE END
OF THE WEEK. THEREFORE NEAR NORMAL TEMPERATURES AND DRY CONDITIONS
ARE IN THE FORECAST FOR THE REMAINDER OF NEXT WEEK.
&&
.AVIATION...(FOR THE 12Z TAFS THROUGH 12Z SATURDAY MORNING)
ISSUED AT 620 AM CDT FRI MAR 14 2014
VFR CONDITIONS ARE EXPECTED AT BOTH TERMINALS THROUGH TOMORROW
MORNING.
&&
.FIRE WEATHER...
ISSUED AT 925 AM CDT FRI MAR 14 2014
USING LOWER DEWPOINTS THAN THE PREVIOUS FORECAST HAD INDICATED IS
BRINGING THE RELATIVE HUMIDITY IN THE EASTERN PANHANDLE AND
WESTERN NEBRASKA SANDHILLS TO 15-20 PERCENT. THE RELATIVE HUMIDITY
IS STILL JUST ABOVE THE CRITICAL THRESHOLD AND WIND GUSTS ARE NOT
EXPECTED TO REACH 25 MPH...SO WE WILL NOT ISSUE ANY FIRE WEATHER
HEADLINES. THE SITUATION WILL NEED TO BE MONITORED THROUGH THE DAY
FOR THE POSSIBILITY OF CRITICAL FIRE PARAMETERS.
&&
.LBF WATCHES/WARNINGS/ADVISORIES...
NONE.
&&
$$
UPDATE...SPRINGER
SHORT TERM...KNUTSVIG
LONG TERM...BROOKS
AVIATION...KNUTSVIG
FIRE WEATHER...SPRINGER
18Z TAF ISSUANCE/FORECAST DISCUSSION.
&&
.ARX WATCHES/WARNINGS/ADVISORIES...
WI...NONE.
MN...NONE.
IA...NONE.
&&
$$
SHORT TERM...HALBACH
LONG TERM...HALBACH
AVIATION...DAS
AREA FORECAST DISCUSSION
NWS PHOENIX AZ
1015 AM MST FRI MAR 14 2014
.SYNOPSIS...
ISOLATED SHOWERS AND THUNDERSTORMS ARE EXPECTED TODAY MAINLY ACROSS
THE HIGHER TERRAIN NORTH AND EAST OF PHOENIX AS AN AREA OF LOW
PRESSURE MOVES EASTWARD THROUGH ARIZONA. WARMER CONDITIONS WILL
RETURN FOR THE WEEKEND AS HIGH PRESSURE BECOMES REESTABLISHED ACROSS
THE DESERT SOUTHWEST. ABOVE AVERAGE TEMPERATURES WILL PERSIST
THROUGH NEXT WEEK WITH NO CHANCE OF PRECIPITATION.
&&
.DISCUSSION...
POSITIVELY TILTED UPPER TROUGH OVER ARIZONA THIS MORNING WITH THE
MAIN VORT LOBE CENTERED OVER SOUTHWEST ARIZONA. THIS HAS BEEN
PRODUCING VERY WEAK SHOWERS OVER SOUTH-CENTRAL ARIZONA AND NORTHERN
ARIZONA. PVA AND ASSOCIATED Q FORCING WILL IS SHIFTING TO THE
EASTERN HALF OF ARIZONA AND RADAR TRENDS REFLECT THIS WITH ECHOES
OVER OUR FORECAST AREA MOVING OUT OF METRO PHOENIX AND INTO PINAL
AND GILA COUNTIES. SHOWERS ARE WEAK AND AT BEST ARE ONLY PRODUCING
SPRINKLES. LATEST MODELS ARE SOMEWHAT OF A MIXED BAG ON THE QPF FOR
THIS AFTERNOON. HOWEVER...A MAJORITY DEPICT MORE QPF THIS AFTERNOON
THAN THIS MORNING BUT PRETTY MUCH JUST FOR ZONE 24 NOT METRO
PHOENIX. THIS IS LIKELY DUE TO A COMBINATION OF LINGERING Q FORCING
AND SOME DESTABILIZATION WITH SURFACE HEATING AND MID LEVEL COOLING.
THE HRRR IS MORE GENEROUS FOR THE PHOENIX AREA AS IT DEVELOPS
SHOWERS NEAR THE MARICOPA/YAVAPAI BORDER AND TRACKS THEM SOUTH AND
EASTWARD SUCH THAT NORTHERN AND EASTERN PORTIONS WOULD BE PREFERRED.
HOWEVER THE AMOUNTS...IF ANY...WILL BE QUITE LIGHT. WILL MAKE SOME
ADJUSTMENTS TO THE POPS THIS AFTERNOON. POPS DROP OFF DRAMATICALLY
THIS EVENING AS THE SYSTEM CONTINUES MOVING EASTWARD AND SURFACE
HEATING GOES AWAY. MORE LATER.
&&
.PREVIOUS DISCUSSION /ISSUED AT 310 AM MST MAR 14 2014/...
AN AREA OF LOW PRESSURE CONTINUES TO MOVE EASTWARD THROUGH AZ THIS
MORNING. LATEST IR IMAGERY SHOWS WIDESPREAD MID CLOUDS WITH SOME
COOLING TOPS ACROSS NORTHERN AZ. ACROSS SOUTH-CENTRAL AZ...ISOLATED
LIGHT SHOWERS HAVE BEEN OBSERVED ACROSS THE PHOENIX AREA AND WHERE
IT IS NOT RAINING...LATEST RADAR IMAGERY SUGGESTS THAT VIRGA IS
PREVALENT. AT DEER VALLEY AIRPORT...WINDS BRIEFLY GUSTED TO 23 MPH
DURING A SHOWER AND ADDITIONAL ISOLATED GUSTS AS HIGH AS 35 MPH ARE
POSSIBLE THIS MORNING. MEANWHILE...STRONGER THAN NORMAL WINDS ALONG
WITH THE CLOUDS ARE RESULTING IN RELATIVELY WARM CONDITIONS. AS OF 3
AM...THE TEMPERATURE AT KPHX HAS NOT DROPPED BELOW 70 DEGREES.
RECORD WARM MINIMUM FOR TODAY IS 64 DEGREES WHICH LAST OCCURRED IN
1984.
MAIN VORT MAX EVIDENT ON WV IMAGERY NEAR BLYTHE CONTINUES TO PIVOT
CYCLONICALLY...WHICH HAS SLOWED THE EASTWARD PROGRESSION OF THE
TROUGH. CONSEQUENTLY...LATEST HRRR INDICATES THAT AREAS OF VIRGA AND
SHOWERS WILL BACKBUILD ACROSS SOUTH-CENTRAL AZ AND PERSIST THIS
MORNING. LATEST GPS-MET AT TEMPE MEASURED AN IPW NEAR 0.6 INCHES.
HOWEVER...ANY RAIN THAT MANAGES TO REACH THE SURFACE WILL LIKELY NOT
AMOUNT TO MORE THAN A HUNDREDTH OF AN INCH. GLOBAL AND MESOSCALE
MODELS ARE IN GOOD AGREEMENT THAT SHOWERS WILL BECOME MORE ORGANIZED
LATER THIS MORNING AND THIS AFTERNOON ONCE THE ATMOSPHERE HAS AN
OPPORTUNITY TO DESTABILIZE. STRONGEST QG FORCING FOR ASCENT WILL
SLIDE INTO EASTERN AZ BY LATE MORNING...THOUGH CONVECTIVE AND
OROGRAPHIC EFFECTS WILL PREDOMINATE INSTEAD. SHOWERS WILL MAINLY BE
CONFINED TO THE HIGHER TERRAIN NORTH AND EAST OF PHOENIX AND POPS
WERE RAISED TO AS HIGH AS 80 PERCENT ACROSS A SMALL PORTION OF
EASTERN GILA COUNTY. GIVEN THE SUBSIDENCE BEHIND THE TROUGH
AXIS...ACTIVITY WILL QUICKLY DISSIPATE WITH THE LOSS OF HEATING
AROUND SUNSET.
STRONG ANTICYCLONE IN THE EASTERN PACIFIC WILL SLIDE EASTWARD THIS
WEEKEND WITH TEMPERATURES QUICKLY REBOUNDING INTO THE MID 80S UNDER
SUNNY SKIES. BREEZY CONDITIONS WILL DEVELOP SATURDAY AFTERNOON
BEHIND THE PASSAGE OF A TROUGH...PARTICULARLY DOWN THE CO RIVER
VALLEY WHERE GUSTS MAY REACH AS HIGH AS 30 MPH. WARMEST DAY APPEARS
TO BE MONDAY AS SOMEWHAT OF A RETURN FLOW DEVELOPS AHEAD OF AN
APPROACHING TROUGH DROPPING OUT OF THE ROCKIES. GFS/ECMWF HAVE COME
INTO MUCH BETTER AGREEMENT AND INDICATE THE TROUGH WILL ONLY BRUSH
BY THE FOUR CORNERS OR PERHAPS FURTHER EAST. MAIN IMPACT ACROSS THE
LOWER DESERTS WILL BE SLIGHTLY COOLER TEMPERATURES
TUESDAY-WEDNESDAY. THEREAFTER...HEIGHT RISES WILL HERALD ADDITIONAL
WARMING THROUGH LATE WEEK...THOUGH HIGH TEMPERATURES ARE EXPECTED TO
REMAIN WELL BELOW RECORDS.
&&
.AVIATION...
SOUTH-CENTRAL ARIZONA INCLUDING KPHX...KIWA...AND KSDL...
CONSIDERABLE CLOUDINESS CONTINUES THROUGH MOST OF TODAY...WITH SCT
TO BKN DECKS AROUND 12-14K FEET THROUGH FRIDAY EARLY EVENING. SOME
VIRGA AND LIGHT SHOWERS ARE POSSIBLE THOUGH CONFIDENCE IS LOW
ANYTHING WILL IMPACT THE TAF SITES...SO NO MENTION IN THE AREA TAFS
AT THIS TIME. VARIABLE GUSTY WINDS ARE POSSIBLE WITH SHOWER
DEVELOPMENT...BUT SPEEDS SHOULD REMAIN BELOW 20 KTS. SHOWER ACTIVITY
WILL REMAIN WELL TO THE NORTH AND EAST OF AREA AIR FIELDS BY FRIDAY
AFTERNOON AND EVENING.
SOUTHEAST CALIFORNIA AND SOUTHWEST ARIZONA INCLUDING KIPL AND KBLH...
WINDS WILL GENERALLY FAVOR WEST AT KIPL AND N TO NW AT KBLH
FOLLOWING WEAK FRONTAL PASSAGE...BUT SPEEDS SHOULD MOSTLY STAY AOB
12KT NEXT 24 HOURS. OTHERWISE...PERIODIC MID/HIGH CLOUDS ABOVE 15K
WILL GENERALLY CLEAR BY FRIDAY MORNING.
AVIATION DISCUSSION NOT UPDATED FOR AMENDED TAFS.
&&
.FIRE WEATHER...
SUNDAY THROUGH THURSDAY...
HIGH PRESSURE WILL BUILD EASTWARD INTO THE DESERT SOUTHWEST BRINGING
A WARMING TREND TO THE REGION THROUGH THE WEEKEND. BREEZY CONDITIONS
ARE EXPECTED ON SUNDAY AS A WEATHER SYSTEM SKIRTS BY JUST TO THE
EAST OF THE REGION. DRY CONDITIONS WILL PERSIST WITH MOSTLY CALM
ZONAL WIND FLOW EXPECTED. BRIEF GUSTS ON TUESDAY ALONG THE LOWER
COLORADO RIVER VALLEY ARE POSSIBLE...THOUGH LESS THAN 20 MPH
EXPECTED. NO MENTION OF PRECIPITATION CHANCES DURING THIS TIME
PERIOD.
&&
.PSR WATCHES/WARNINGS/ADVISORIES...
AZ...NONE.
CA...NONE.
&&
$$
VISIT US ON FACEBOOK...TWITTER...AND AT WEATHER.GOV/PHOENIX
DISCUSSION...AJ
PREVIOUS DISCUSSION...HIRSCH
AVIATION...CDEWEY
FIRE WEATHER...CDEWEY
AREA FORECAST DISCUSSION
NWS CHARLESTON SC
153 PM EDT FRI MAR 14 2014
.SYNOPSIS...
HIGH PRESSURE WILL PREVAIL THROUGH SATURDAY. A WARM FRONT WILL
LIFT INTO THE AREA SATURDAY NIGHT BEFORE A COMPLEX LOW PRESSURE
SYSTEM MOVES IN FROM THE WEST SUNDAY THROUGH MONDAY NIGHT. HIGH
PRESSURE WILL THEN BUILD OVER THE AREA DURING MID AND LATE WEEK.
&&
.NEAR TERM /UNTIL 6 PM THIS EVENING/...
A ZONAL FLOW WILL PERSIST ALOFT WHILE AT THE SURFACE A BROAD AREA
OF HIGH PRESSURE PUSHES INTO THE WESTERN ATLANTIC. THIS PATTERN
YIELDS INCREASING WARM ADVECTION IN THE LOW AND MID LEVELS WITH
SUNNY SKIES. LOW-LEVEL DEWPOINTS WILL RISE THROUGH THE DAY...
ESPECIALLY COASTAL SECTIONS WHERE WE COULD SEE SOME CUMULUS POP UP
LATER IN THE DAY. THICKNESS PROGS FROM THE LATEST RUC13 SUPPORT
THE EXISTING HIGH TEMPERATURE FORECAST SO WE MAINTAINED TEMPS IN
THE MID AND UPPER 60S TODAY.
&&
.SHORT TERM /6 PM THIS EVENING THROUGH MONDAY/...
TONIGHT...THE OVERALL SETUP WILL REMAIN LARGELY UNCHANGED. SOUTHERLY
FLOW WILL CONTINUE AROUND THE WEST SIDE OF THE ATLANTIC SURFACE HIGH
AND WE WILL BEGIN TO SEE INCREASING CLOUDS LATE IN THE EVENING AND
OVERNIGHT. MODELS ARE ALL IN GOOD AGREEMENT WITH SOME SHOWERS
DEVELOPING IN AN AREA OF CONVERGENCE OVER THE COASTAL WATERS
PRIMARILY AFTER MIDNIGHT. THIS ACTIVITY LOOKS AS THOUGH IT WILL
REMAIN ISOLATED AND REMAIN OVER THE ADJACENT COASTAL WATERS WHERE A
SMALL SLIVER OF SLIGHT CHANCE POPS HAS BEEN ADDED TO THE FORECAST.
OTHERWISE...LOWS WILL BE MUCH WARMER THURSDAY NIGHT. THE FORECAST
FEATURES MID 40S INLAND RANGING TO UPPER 40S/LOW 50S AT THE COAST.
SATURDAY...SOUTHERLY FLOW ALONG THE WESTERN EDGE OF HIGH PRESSURE
OFF THE SOUTHEAST COAST WILL LEAD TO A WARM DAY WELL AHEAD OF A
STRENGTHENING LOW PRESSURE SYSTEM OVER THE SOUTHERN PLAINS. THE
PATTERN WILL RESULT IN THE WARMEST TEMPS OF THE WEEKEND WITH
1000-850 MB THICKNESS VALUES SUPPORTING AFTERNOON HIGHS IN THE
MID/UPPER 70S OVER MOST AREAS AWAY FROM THE IMMEDIATE COAST. WEATHER
CONDITIONS SHOULD REMAIN DRY UNTIL A WARM FRONT LIFTS NORTH INTO THE
AREA LATE SATURDAY NIGHT...WITH DEEPENING MOISTURE AND ISENTROPIC
ASCENT. HOWEVER...THE BULK OF PRECIP IS EXPECTED TO REMAIN WEST OF
THE FORECAST AREA NEAR THE VICINITY OF THE DEEPENING SFC LOW. HAVE
THEREFORE MAINTAINED ONLY SLIGHT CHANCE POPS FOR A MAJORITY OF
SATURDAY NIGHT...THEN CHANCES INLAND LATE. OVERNIGHT TEMPS WILL
REMAIN MILD WITH WARM AIR ADVECTION IN PLACE ALONG WITH EXPANDING
CLOUD COVER. EXPECT LOW TEMPS IN THE LOW/MID 50S AWAY FROM THE
COAST.
SUNDAY THROUGH MONDAY...DEEP MOISTURE WILL CONTINUE TO ADVECT OVER
THE SOUTHEAST AHEAD OF A STRENGTHENING LOW PRESSURE SYSTEM TRACKING
FROM THE SOUTH CENTRAL UNITED STATES TO THE SOUTHEAST. EXPECT SOME
SHOWERS TO BREAK OUT BY SUNDAY AFTERNOON AS ENHANCED FORCING OCCURS
WITH A LOW LVL JET AHEAD OF A STRONG H5 SHORTWAVE DIGGING OVER THE
DEEP SOUTH. DESPITE SOUTH/SOUTHEAST FLOW AHEAD OF THE APPROACHING
LOW...TEMPS WILL BE SOMEWHAT LIMITED DUE TO CLOUD COVER OVER THE
AREA. AS A RESULT...PRECIP SHOULD REMAIN IN THE FORM OF SHOWERS
WHILE TEMPS PEAK INTO THE UPPER 60S TO AROUND 70.
PRECIP COVERAGE AND INTENSITY WILL LIKELY RAMP UP SUNDAY EVENING AND
PERSIST THROUGH MONDAY MORNING AS PWATS APPROACH 1.75 INCHES WHILE
ENHANCED FORCING OCCURS WITH THE STRONG H5 SHORTWAVE AND H25 JET
ALOFT. TEMPS WILL ALSO REMAIN MILD SUNDAY NIGHT...IN THE MID/UPPER
50S OVER MOST LOCATIONS. ALTHOUGH MOST INSTABILITY LOOKS TO REMAIN
SOUTH AND OFFSHORE...WE CAN NOT RULE OUT A FEW THUNDERSTORMS GIVEN
THE AMOUNT OF FORCING THAT OCCURS AS THE SYSTEM MAKES WAY TO THE
ATLANTIC. HAVE THEREFORE INTRODUCED SLIGHT CHANCES OF THUNDERSTORMS
ALONG WITH WIDESPREAD SHOWERS SUNDAY NIGHT INTO EARLY MONDAY. EXPECT
WIDESPREAD SHOWERS TO CONTINUE THROUGH MUCH OF MONDAY AS MOISTURE
LINGERS OVER THE AREA WHILE THE MID/UPPER LVL LOW SHIFTS OFFSHORE.
TEMPS WILL ALSO COOL OFF CONSIDERABLY THROUGHOUT THE DAY ON MONDAY
AS A NORTHERLY FLOW DEVELOPS ALONG THE BACK EDGE OF THE DEPARTING
LOW PRESSURE SYSTEM. MONDAY HIGHS COULD PEAK INTO THE LOW/MID 60S
EARLY...BEFORE COOLING OFF INTO THE MID/UPPER 50S OVER MOST
LOCATIONS BY MONDAY AFTERNOON.
&&
.LONG TERM /MONDAY NIGHT THROUGH THURSDAY/...
SHOWERS SHOULD BE ONGOING MONDAY NIGHT AS A LOW PRESSURE SYSTEM
SHIFTS OFFSHORE. NORTHERLY FLOW ALONG THE BACK EDGE OF THE DEPARTING
SYSTEM SHOULD RESULT IN COOLER OVERNIGHT LOWS...IN THE UPPER 30S TO
LOWER 40S. DRYER CONDITIONS SHOULD THEN RETURN OVER THE REGION BY
TUESDAY EVENING AND PERSIST INTO WEDNESDAY AS HIGH PRESSURE WEDGES
SOUTHWARD OVER THE AREA FOR A BRIEF PERIOD. TEMPS WILL STRUGGLE TO
WARM SIGNIFICANTLY UNDER THE WEDGE ON TUESDAY...BUT SHOULD GRADUALLY
WARM TO AROUND 70 ON WEDNESDAY AS THE WEDGE BREAKS DOWN DUE TO A
LARGE TROUGH OF LOW PRESSURE SHIFTING OVER THE MIDWEST. A WEAK/DRY
COLD FRONT COULD SHIFT THROUGH THE AREA ON THURSDAY...BUT HIGH
PRESSURE AND NEAR NORMAL TEMPS SHOULD PREVAIL OVER THE SOUTHEAST
INTO LATE WEEK.
&&
.AVIATION /18Z FRIDAY THROUGH WEDNESDAY/...
VFR CONDITIONS WILL PREVAIL AT KCHS AND KSAV THROUGH 18Z SATURDAY.
EXTENDED AVIATION OUTLOOK...VFR CIGS/VSBYS ARE EXPECTED AT BOTH
CHS AND SAV TERMINALS THROUGH SATURDAY. MVFR CIGS AND/OR VSBYS ARE
LIKELY SUNDAY AND MONDAY WITH SHOWERS AND LOW CLOUDS ASSOCIATED AS
A LOW PRESSURE SYSTEM SHIFTS OVER THE AREA. VFR CONDITIONS SHOULD
RETURN AT BOTH TERMINALS BY TUESDAY AFTERNOON AND PERSIST INTO THE
MIDDLE OF NEXT WEEK.
&&
.MARINE...
TODAY AND TONIGHT...TRANQUIL CONDITIONS ARE EXPECTED ACROSS THE
LOCAL WATERS UNDER THE INFLUENCE OF HIGH PRESSURE. FLOW WILL BE
NORTHEAST FOR A BRIEF TIME THIS MORNING BEFORE QUICKLY TURNING MORE
SOUTH AND SOUTHEASTERLY AS THE CENTER OF THE SURFACE HIGH SHIFTS OFF
THE EAST COAST. WINDS WILL GENERALLY BE AROUND 10 KTS OR
LESS...EXCEPT FOR UP TO 15 KTS ALONG THE LAND/SEA INTERFACE WHERE
SEA BREEZE WILL DEVELOP. SEAS WILL BE 1 TO 2 FT. OVERNIGHT...THE
FLOW WILL TURN A BIT MORE SOUTHWESTERLY AND INCREASE INTO THE
10-15 KT RANGE. SEAS WILL TICK UPWARD TO 2-3 FT.
SATURDAY THROUGH WEDNESDAY...WINDS/SEAS SHOULD REMAIN BELOW SMALL
CRAFT ADVISORY LEVELS THROUGH EARLY SUNDAY AS HIGH PRESSURE DOMINATES
OVER THE WATERS. WINDS/SEAS SHOULD THEN INCREASE/BUILD SUNDAY
AFTERNOON INTO MONDAY AS A DEEPENING LOW PRESSURE SYSTEM APPROACHES
FROM THE WEST AND SHIFTS OFF THE SOUTHEAST COAST. WE COULD SEE SMALL
CRAFT ADVISORY LEVEL CONDITIONS OVER OUTER GEORGIA WATERS AND
NORTHERN SC WATERS SUNDAY NIGHT AS A LOW LEVEL JET ASSOCIATED WITH
THIS SYSTEM SHIFTS OFFSHORE. 6 FT SEAS COULD LINGER OVER OUTER
GEORGIA WATERS INTO MUCH OF MONDAY AS WINDS BECOME NORTHERLY ALONG
THE BACK EDGE OF THE DEPARTING LOW PRESSURE SYSTEM. CONDITIONS
SHOULD THEN IMPROVE BY TUESDAY AS HIGH PRESSURE SETTLES OVER THE
WATERS THROUGH MID WEEK.
&&
.FIRE WEATHER...
RELATIVE HUMIDITY VALUES ARE EXPECTED TO FALL TO AROUND 25 PERCENT
FOR A FEW HOURS LATE THIS MORNING AND INTO EARLY AFTERNOON AWAY FROM
THE IMMEDIATE GEORGIA COAST. WINDS WILL INCREASE IN THE AFTERNOON
INTO THE 15 MPH RANGE OUT OF THE SOUTH AND SOUTHEAST. DEWPOINTS WILL
RECOVER IN THE LATE AFTERNOON AND RELATIVE HUMIDITY VALUES WILL RISE
TO ABOVE CRITICAL VALUES. WITH THIS COMBINATION OF LOW RELATIVE
HUMIDITIES AND ELEVATED WINDS...A FIRE DANGER STATEMENT WILL BE
ISSUED AFTER COORDINATION WITH SURROUNDING OFFICES.
&&
.CHS WATCHES/WARNINGS/ADVISORIES...
GA...NONE.
SC...NONE.
MARINE...NONE.
&&
$$
SYNOPSIS...
NEAR TERM...JRL
SHORT TERM...DPB
LONG TERM...DPB
AVIATION...JRL
MARINE...BSH/DPB
FIRE WEATHER...
AREA FORECAST DISCUSSION
NWS CHICAGO IL
ISSUED BY NATIONAL WEATHER SERVICE MILWAUKEE/SULLIVAN WI
341 PM CDT FRI MAR 14 2014
.SHORT TERM...(THIS EVENING THROUGH SATURDAY)
ISSUED AT 337 PM CDT FRI MAR 14 2014
FORECAST CONFIDENCE MEDIUM.
WATER VAPOR IMAGERY SHOWS A FAIRLY COMPACT MID-LEVEL SHORT WAVE
MOVING ACROSS NORTHERN LAKE MICHIGAN...WITH SURFACE LOW PRESSURE
OVER LAKE HURON AND A TRAILING SURFACE COLD FRONT MOVING SOUTHEAST
THROUGH SRN WI INTO NW IL. THE SURFACE COLD FRONT WILL SWEEP ACROSS
THE REST OF THE AREA LATE THIS AFTERNOON/EVENING.
A QUIET NIGHT EXPECTED WITH SOME LOWER CLOUDS IN THE COLD ADVECTION
BEHIND FRONT. 850MB TEMPERATURES DIP TO AROUND -2C TO -4C BY 12Z
SATURDAY LEADING TO LOWS IN THE MID 20S INLAND NORTH...WITH UPPER
20S IN THE SOUTHERN FORECAST AREA AND FROM THE CITY AND SOUTH ALONG
THE LAKE. GUSTY WEST WINDS WILL EASE SOMEWHAT THIS EVENING AS THE
SURFACE LOW OVER LAKE HURON MOVES AWAY TO THE EAST...BUT WILL REMAIN
STRONG ENOUGH ALONG WITH SOME LOWER COLD ADVECTION CLOUDS TO PREVENT
TEMPS FROM GETTING EVEN COLDER.
NEXT SHORT WAVE APPROACHES FROM THE NW SATURDAY. 12Z RUNS OF THE GFS
AND CANADIAN GEM BRING PCPN TO THE NORTHERN COUNTIES BY 00Z
SUNDAY...WHILE 12Z NAM AND ECMWF KEEP THE FORECAST AREA DRY...IN
SPITE OF STRENGTHENING 850-700 MB FRONTOGENESIS. LACK OF PCPN LOOKS
TO BE TIED TO DRY LAYER BELOW 5K FT ON CROSS SECTIONS AND FORECAST
SOUNDINGS THAT IS REFLECTED AS WELL IN HIGH CONDENSATION PRESSURE
DEFICITS ON ISENTROPIC SURFACES. A BLENDED SOLUTION BRINGS SLIGHT
CHANCE/LOW CHANCE POPS IN THE LATE AFTERNOON TO NRN CWA...WITH THE
BETTER CHANCE COMING SATURDAY NIGHT. TOP DOWN METHOD INDICATES IT
WILL BE ALL SNOW...THOUGH WARM AIR ADVECTION AHEAD OF THE WAVE AND
ASSOCIATED SURFACE LOW BRINGS A TIGHT TEMPERATURE GRADIENT ACROSS
THE CWA WITH HIGHS IN THE UPPER 30S NORTH TO AROUND 50 SOUTH.
.LONG TERM...(SATURDAY NIGHT THROUGH FRIDAY)
ISSUED AT 337 PM CDT FRI MAR 14 2014
SATURDAY NIGHT...FORECAST CONFIDENCE MEDIUM.
HIGH PRESSURE SINGKING INTO THE GREAT LAKES REGION WILL PUSH ARCTIC
AIR INTO NORTHERN IL BEGINNING SATURDAY AFTERNOON THROUGH SUNDAY.
THERE IS INCREASING CONFIDENCE FOR SNOW TO SPREAD INTO NORTHERN IL
EARLY SATURDAY EVENING AS A NARROW ZONE OF STRONG...SLOPED 925-700MB
FRONTOGENESIS SLIPS SOUTHWARD. THIS WILL BE A WET SNOW OVER A FAIRLY
SHORT PERIOD OF TIME AND AMOUNT TO AROUND ONE INCH TOTAL. NORTHEAST
WINDS WILL INCREASE AND BECOME GUSTY OVERNIGHT WITH THE COLD AIR
ADVECTION.
SUNDAY THROUGH MONDAY...FORECAST CONFIDENCE HIGH.
SUNDAY WILL BE A BITTER DAY WITH BRISK NORTHWEST WINDS...SCATTERED
LOW STRATOCUMULUS CLOUDS AND HIGH TEMPERATURES IN THE 20S. WITH
SKIES CLEARING AND WINDS TAPERING OFF SUNDAY NIGHT UNDER HIGH
PRESSURE...LOW TEMPS WILL DROP INTO THE TEENS.
A MID LEVEL RIDGE OVER THE NORTHERN PLAINS WILL MOVE INTO THE GREAT
LAKES ON MONDAY AS A MID LEVEL TROUGH DEEPENS OVER THE PACIFIC
NORTHWEST. WARMER AIR WILL GRADUALLY RETURN TO THE MIDWEST ON MONDAY
WITH HIGHS RISING INTO THE 30S.
TUESDAY AND WEDNESDAY...FORECAST CONFIDENCE LOW.
THE MID LEVEL TROUGH WILL DIG INTO THE NORTHERN PLAINS TUESDAY TO
BRING OUR NEXT CHANCE FOR PRECIPITATION. THE GFS AND ECMWF ARE IN
AGREEMENT THAT NORTHERN IL WILL BE IN THE WARM SECTOR AS THE SURFACE
LOW TRACKS ACROSS NORTHERN IOWA/SOUTHERN MN TUE AND INTO CENTRAL
MICHIGAN TUESDAY NIGHT...SO ANY PRECIP WILL LIKELY BE RAIN.
TIMING IS UNCERTAIN FOR WHEN THE COLD FRONT WILL MOVE THROUGH THE
LOT FORECAST AREA. THE ECMWF IS ABOUT 12 HOURS SLOWER WITH THIS
FRONT THAN THE GFS. EITHER WAY...IT LOOKS LIKE RAIN WILL TRANSITION
TO SNOW WITH THIS FRONT...WITH PRECIP ENDING SHORTLY AFTER THE
FRONTAL PASSAGE SO NOT MUCH ACCUMULATION IS EXPECTED.
THURSDAY AND FRIDAY...FORECAST CONFIDENCE MEDIUM.
HIGH PRESSURE WILL TAKE CONTROL OF THE CENTER OF THE COUNTRY FOR THE
LATTER HALF OF THE WORK WEEK. MAX TEMPERATURES WILL BE IN THE LOWER
TO MID 40S...A LITTLE BELOW NORMAL FOR MID MARCH. MODELS ARE SHOWING
ANOTHER PUSH OF WARM AIR APPROACHING IL ON FRIDAY WITH A WEAK
SHORTWAVE.
&&
.AVIATION...
//ORD AND MDW CONCERNS...UPDATED 20Z...
* GUSTY SURFACE WINDS TO PERSIST UNTIL AROUND SUNSET.
* MVFR CIGS LIKELY TO IMPACT TERMINALS FOR A FEW HOURS EARLY THIS
EVENING.
BAK
//DISCUSSION...UPDATED 18Z...
A COLD FRONT CONTINUES TO CROSS THE NORTHWEST IL/NORTHEAST IN
TERMINAL AREA ABOUT ON SCHEDULE. THE FRONT IS COMING THROUGH DRY
AS EXPECTED. HOWEVER...A MVFR STRATO CU DECK WRAPPING AROUND THE
BACK SIDE OF THE FRONT NOW APPEARS POISED TO SPREAD ACROSS THE
AREA LATE THIS AFTERNOON/EARLY THIS EVENING BASED ON RECENT
SATELLITE TRENDS/EXTRAPOLATION.
LATER THIS EVENING...SKIES SHOULD SCATTER OUT...WITH WINDS
TRENDING LIGHT AS A SKINNY RIDGE OF HIGH PRESSURE BUILDS IN DURING
THE NIGHT. VFR CIGS EXPECTED TO DEVELOP AGAIN BY SATURDAY MORNING
AS A STORM SYSTEM BEGINS TO APPROACH FROM THE WEST. ANY
SIGNIFICANT IMPACTS FROM THE APPROACHING SYSTEM WILL OCCUR AFTER
THE END OF THE 18Z TAF VALID TIME.
BAK
//ORD AND MDW CONFIDENCE...UPDATED 20Z...
* HIGH CONFIDENCE IN SURFACE WIND TRENDS.
* MEDIUM CONFIDENCE IN A PERIOD OF MVFR CIGS SPREADING ACROSS THE
TERMINALS EARLY THIS EVENING.
BAK
//OUTLOOK FOR ORD/MDW FOR 00Z SUNDAY-12Z FRIDAY...UPDATED 12Z...
SATURDAY NIGHT...MVFR POSSIBLE WITH PERIOD OF LIGHT SNOW.
SUNDAY...VFR PROBABLE. GUSTY NORTHEAST WINDS.
MONDAY...VFR FAIR WEATHER.
TUESDAY...CHANCE OF RA TUES AFTERNOON & NIGHT WITH VFR BECOMING MVFR.
WEDNESDAY...SLIGHT CHANCE OF RA/SN. MVFR POSSIBLE.
THURSDAY...VFR FAIR.
ED F
&&
.MARINE...
ISSUED AT 337 PM CDT FRI MAR 14 2014
WILL LET SMALL CRAFT ADVISORY EXPIRE IN THE NEARSHORE WATERS AT
10 PM WITH SURFACE PRESSURE GRADIENT RELAXING AS LOW MOVES EAST OF
LAKE HURON AND ACROSS SW QUEBEC OVERNIGHT. A SECOND SHORT WAVE
WILL BRING A CHANCE FOR RAIN OR SNOW...OR A MIX...TO NORTHERN LAKE
MICHIGAN TONIGHT. HIGH PRESSURE BUILDING IN BEHIND THIS WAVE WILL
TURN NORTHWEST WINDS TO THE NORTHEAST AND INCREASING TO NEAR GALE
FORCE IN THE SOUTH SATURDAY NIGHT AND SUNDAY. JUST BORDERLINE AT
THIS TIME SO NO WATCH...BUT LATER SHIFTS WILL HAVE TO MONITOR.
&&
.LOT WATCHES/WARNINGS/ADVISORIES...
IL...NONE.
IN...NONE.
LM...SMALL CRAFT ADVISORY UNTIL 10 PM CDT THIS EVENING FOR BURNS
HARBOR TO MICHIGAN CITY-CALUMET HARBOR TO GARY-GARY TO
BURNS HARBOR-NORTHERLY ISLAND TO CALUMET HARBOR-WILMETTE
HARBOR TO NORTHERLY ISLAND-WINTHROP HARBOR TO WILMETTE
HARBOR.
&&
$$
SHORT TERM...REM
LONG TERM...MRC
MARINE...REM
VISIT US AT HTTP://WEATHER.GOV/CHICAGO (ALL LOWERCASE)
FOLLOW US ON FACEBOOK...TWITTER...AND YOUTUBE AT:
WWW.FACEBOOK.COM/US.NATIONALWEATHERSERVICE.CHICAGO.GOV
WWW.TWITTER.COM/NWSCHICAGO
WWW.YOUTUBE.COM/NWSCHICAGO
[top]
Area Forecast Discussion
National Weather Service Lincoln IL
302 PM CDT Fri Mar 14 2014
.DISCUSSION...
ISSUED 256 PM CDT Fri Mar 14 2014
Forecast problems is the light snow event on Sunday, and a front
producing light rain Tuesday night to Wed.
SHORT TERM...Tonight through Sunday night.
Upper air and moisture channel data this morning shows upper wave
over IA driving surface front through IA today. Clouds are the
only result of this feature, but with gusty winds both ahead of
and behind the front. Next system handled similar by the models,
is an upper level trof moving from NE/KS and through MO, which
deepens surface low that moves through MO to TN/southern KY. As a
result, pcpn develops north of low over the southern 1/2 of IL
late Sat night, and through day Sun. Pcpn will start as rain
overnight in central and southeast CWA, changing over to all snow
in the central on Sun and southeast by afternoon. Best overrunning
north of the low is over the southeast sections, in the afternoon
Sunday when the cold air reaches the area and so 2-3 inches psbl
in that region. Started with WWD amounts, modifying the QPF
amounts and having rain or mixture in southeast intially until
cold air reachs area, as the forecast soundings indicated.
LONG TERM...Monday to Friday
Long range is mainly quiet, but the period of Tuesday night to
Wednesday. During that period, another system will push a front
through early Wednesday, with a chance of light rain for the area.
Temperatures through the period remain below normal.
Goetsch
&&
.AVIATION...
ISSUED 1233 PM CDT Fri Mar 14 2014
Cold front currently in the Illinois River Valley will work its
way eastward through central Illinois over the next couple of
hours. HRRR seems to be handling timing of FROPA fairly well, so
will follow it closely this afternoon. Winds will veer to W/NW at
KPIA at 18z, then further east to KCMI by around 21z. Gusts will
generally be in the 20 to 25kt range, but will occasionally reach
30kt at both KBMI and KCMI. Gusty winds will subside by sunset,
then will go light/variable overnight as high pressure builds into
the area. Once the high begins to shift off to the east, a light
southeasterly return flow will develop by Saturday morning. High
clouds currently blanketing central Illinois will shift eastward
with the front this afternoon, followed by clear skies tonight.
After that, a band of mid-level clouds associated with warm
advection will develop mainly across Iowa into northern Illinois
by Saturday morning. Will include BKN cloud deck at around 12000ft
at both KPIA and KBMI after 14z accordingly.
Barnes
&&
.ILX WATCHES/WARNINGS/ADVISORIES...
NONE.
&&
$$
AREA FORECAST DISCUSSION
NWS CHICAGO/ROMEOVILLE IL
1252 PM CDT FRI MAR 14 2014
.DISCUSSION...
341 AM CDT
THE MAIN FORECAST CONCERNS THIS MORNING CENTER AROUND TEMPERATURES
THROUGH THE WEEKEND AND SNOW CHANCES SATURDAY NIGHT.
TEMPERATURES HAVE REMAINED FAIRLY STEADY AROUND 40 DEGREES IN MOST
AREAS OVERNIGHT AS A WARMER AIRMASS CONTINUES TO BE ADVECTED
EAST-NORTHEASTWARD ACROSS THE AREA WITHIN THE WARM SECTOR OF AN AREA
OF LOW PRESSURE TRACKING ACROSS THE UPPER GREAT LAKES. YESTERDAY
EVENINGS RAOBS INDICATED THAT DOWN SLOPING WESTERLY FLOW ACROSS THE
ROCKIES...INDUCED BY THIS SYSTEM...HAD DEVELOPED A THERMAL RIDGE
ACROSS THE PLAINS STATES FEATURING 10+ DEGREE CELSIUS 850 TEMPS.
THIS THERMAL RIDGE WILL OVERSPREAD THE AREA BRIEFLY TODAY AHEAD OF
AN APPROACHING COLD FRONT. THIS SHOULD YIELD A FAIRLY MILD DAY INTO
THE UPPER 40S TO LOW 50S NORTH...TO THE MID TO UPPER 50S ACROSS MY
SOUTHERN COUNTIES. THE SURFACE COLD FRONT SHOULD PUSH ACROSS THE
AREA THIS AFTERNOON...BUT DUE TO FAIRLY WEAK INITIAL PUSH OF COLDER
AIR...IT SHOULD NOT CAUSE TEMPERATURES TO DROP MORE THAN A COUPLE OF
DEGREES FOLLOWING ITS PASSAGE THIS AFTERNOON.
WATER VAPOR IMAGERY THIS MORNING INDICATES A FAIRLY DECENT MID LEVEL
SHORT WAVE/PV ANOMALY...WHICH SHOULD PUSH ACROSS FAR NORTHERN
ILLINOIS AND SOUTHERN WISCONSIN BY EARLY THIS EVENING. THE
ASSOCIATED LIFT FROM THIS DISTURBANCE COULD PRODUCE A FEW SPRINKLES
ACROSS FAR NORTHERN ILLINOIS LATE THIS AFTERNOON AND EARLY THIS
EVENING. HOWEVER...DUE TO RELATIVELY DRY NATURE OF THE WARM SECTOR
AIRMASS...IT APPEARS THAT IT WILL BE HARD TO GET MORE THAN A
SPRINKLE TO THE SURFACE. I HAVE LEFT THIS MENTION OUT OF THE
FORECAST DUE TO THE LOW LIKELIHOOD AND OVERALL SMALL IMPACT.
THE MAIN STORY OVER THE WEEKEND WILL BE THE DEVELOPMENT OF ANOTHER
STORM SYSTEM ACROSS THE SOUTHERN PLAINS DURING THE DAY...IN RESPONSE
TO DISTURBANCE DIGGING SOUTH-SOUTHEASTWARD ALONG THE EASTERN
PERIPHERY OF A RAPIDLY BUILDING WEST COAST UPPER LEVEL RIDGE.
FORECAST GUIDANCE CONTINUES TO SUGGEST THAT THIS SYSTEM WILL TRACK
TO THE SOUTH OF THE AREA SUNDAY WITH MOST PRECIP ALSO REMAINING
SOUTH OF THE AREA. HOWEVER...IN SPITE OF THIS...IT APPEARS THAT
THERE COULD BE A PERIOD OF LIGHT TO MODERATE SNOW ACROSS NORTHERN
ILLINOIS SATURDAY NIGHT IN THE WAKE OF A SECONDARY COLD FRONT.
FORECAST GUIDANCE SUGGESTS THAT A DECENT BAND OF MID-LEVEL FGEN
WILL SET UP ACROSS THE AREA IN THE WAKE OF THIS SECOND SURFACE
FRONTAL ZONE AS A COLD CANADIAN HIGH BUILDS IN ACROSS THE UPPER
MIDWEST. OVERALL...THIS COULD LEAD TO SOME MINOR SNOW ACCUMULATIONS
ACROSS FAR NORTHERN ILLINOIS INTO EARLY SUNDAY MORNING...BUT AMOUNTS
WOULD LIKELY BE AROUND AN INCH AT MOST. I HAVE INCREASE POPS DURING
THIS TIME TO ACCOUNT FOR THIS.
DURING THE DAY SUNDAY...THE PRECIP SHOULD SHIFT SOUTH OF THE AREA AS
DRIER AND COLDER AIR FILTERS IN FROM THE HIGH TO THE NORTH. THE MAIN
STORY FOR SUNDAY WILL BE THE COLD TEMPERATURES. AFTERNOON HIGHS LOOK
TO REMAIN IN THE 20S NORTH TO THE LOW TO MID 30S SOUTH.
TEMPERATURES WILL REBOUND BACK INTO THE 40S NEXT WEEK. THE MAIN
STORY IN THE EXTENDED PERIOD WILL BE THE POTENTIAL FOR ANOTHER
DECENT STORM SYSTEM TO IMPACT THE CENTRAL CONUS LATE TUESDAY THROUGH
WEDNESDAY. FORECAST GUIDANCE CONTINUES TO STRUGGLE ON THE EXACT
EVOLUTION AND TRACK OF THIS SYSTEM NEXT WEEK. HOWEVER...IT DOES
APPEAR THAT IT WILL PRESENT US WITH OUR NEXT CHANCE OF PRECIPITATION
BY MIDWEEK. AT THIS JUNCTURE...I WILL CONTINUE WITH CHANCE POPS FOR
WEDNESDAY...WITH RAIN BEING THE PRIMARY PRECIP TYPE.
KJB
&&
.AVIATION...
//ORD AND MDW CONCERNS...UPDATED 18Z...
* GUSTY SURFACE WINDS TO PERSIST UNTIL AROUND SUNSET.
* MVFR CIGS LIKELY TO IMPACT TERMINALS FOR A FEW HOURS EARLY THIS
EVENING.
BAK
//DISCUSSION...UPDATED 18Z...
A COLD FRONT CONTINUES TO CROSS THE NORTHWEST IL/NORTHEAST IN
TERMINAL AREA ABOUT ON SCHEDULE. THE FRONT IS COMING THROUGH DRY
AS EXPECTED. HOWEVER...A MVFR STRATO CU DECK WRAPPING AROUND THE
BACK SIDE OF THE FRONT NOW APPEARS POISED TO SPREAD ACROSS THE
AREA LATE THIS AFTERNOON/EARLY THIS EVENING BASED ON RECENT
SATELLITE TRENDS/EXTRAPOLATION.
LATER THIS EVENING...SKIES SHOULD SCATTER OUT...WITH WINDS
TRENDING LIGHT AS A SKINNY RIDGE OF HIGH PRESSURE BUILDS IN DURING
THE NIGHT. VFR CIGS EXPECTED TO DEVELOP AGAIN BY SATURDAY MORNING
AS A STORM SYSTEM BEGINS TO APPROACH FROM THE WEST. ANY
SIGNIFICANT IMPACTS FROM THE APPROACHING SYSTEM WILL OCCUR AFTER
THE END OF THE 18Z TAF VALID TIME.
BAK
//ORD AND MDW CONFIDENCE...UPDATED 18Z...
* HIGH CONFIDENCE IN SURFACE WIND TRENDS.
* MEDIUM CONFIDENCE IN A PERIOD OF MVFR CIGS SPREADING ACROSS THE
TERMINALS EARLY THIS EVENING.
BAK
//OUTLOOK FOR ORD/MDW FOR 00Z SUNDAY-12Z FRIDAY...UPDATED 12Z...
SATURDAY NIGHT...MVFR POSSIBLE WITH PERIOD OF LIGHT SNOW.
SUNDAY...VFR PROBABLE. GUSTY NORTHEAST WINDS.
MONDAY...VFR FAIR WEATHER.
TUESDAY...CHANCE OF RA TUES AFTERNOON & NIGHT WITH VFR BECOMING MVFR.
WEDNESDAY...SLIGHT CHANCE OF RA/SN. MVFR POSSIBLE.
THURSDAY...VFR FAIR.
ED F
&&
.MARINE...
328 AM CDT
GUSTY SOUTH TO SOUTHWEST WINDS WILL VEER WEST TODAY AS A COLD FRONT
SWEEPS SOUTHEASTWARD ACROSS THE LAKE. WINDS WILL THEN EASE OFF
SOMEWHAT TONIGHT INTO SATURDAY AS DEEP LOW PRESSURE MOVES AWAY FROM
THE GREAT LAKES INTO QUEBEC. A TIGHTENING PRESSURE GRADIENT ONCE
AGAIN RESULTING FROM HIGH PRESSURE MOVING INTO THE NORTHERN GREAT
LAKES AND LOW PRESSURE MOVING ACROSS THE LOWER MISSISSIPPI VALLEY...
WILL CAUSE WINDS TO INCREASE SOMEWHAT AGAIN SATURDAY NIGHT INTO
SUNDAY MAINLY OVER THE SOUTH HALF OF THE LAKE.
A HIGH PRESSURE RIDGE WILL THEN MOVE ACROSS THE LAKE SUNDAY NIGHT...
WITH LOW PRESSURE THEN DEVELOPING OVER THE CENTRAL PLAINS MONDAY
NIGHT INTO EARLY TUESDAY. THIS LOW WILL THEN MOVE NORTHEAST TOWARD
NORTHERN ILLINOIS TUESDAY NIGHT.
ED F
&&
.LOT WATCHES/WARNINGS/ADVISORIES...
IL...NONE.
IN...NONE.
LM...NONE.
&&
$$
VISIT US AT HTTP://WEATHER.GOV/CHICAGO (ALL LOWERCASE)
FOLLOW US ON FACEBOOK...TWITTER...AND YOUTUBE AT:
WWW.FACEBOOK.COM/US.NATIONALWEATHERSERVICE.CHICAGO.GOV
WWW.TWITTER.COM/NWSCHICAGO
WWW.YOUTUBE.COM/NWSCHICAGO
Area Forecast Discussion
National Weather Service Lincoln IL
1233 PM CDT Fri Mar 14 2014
.DISCUSSION...
ISSUED 1000 AM CDT Fri Mar 14 2014
14z/9am surface analysis shows a cold front approaching the
Mississippi River, while brisk southwesterly winds prevail further
east across central and southeast Illinois. Front is expected to
reach the I-55 corridor by early afternoon, then sink southeast of
I-70 by late afternoon/early evening. Area soundings show very little
moisture for the boundary to work with, so am expecting a dry
FROPA with just some mid/high clouds. Latest satellite imagery
shows quite a bit of high cloud cover streaming northeastward
across Missouri/Illinois ahead of the front, so have boosted sky
cover grids accordingly. 12z KILX upper air sounding shows a
strong low-level jet just off the surface, with 50kt winds noted
at 2000ft aloft. Have therefore increased the wind gusts to
between 30 and 35 mph as higher momentum air mixes to the surface.
Strongest winds will be concentrated east of I-55 as pressure
gradient further west will gradually relax with approach of front
this afternoon. Also made a few tweaks to afternoon highs, mainly
to lower them a couple of degrees across the SE CWA due to thicker
cloud cover across that area. Will still see highs reach the mid
to upper 50s across most locations, with lower 60s south of I-70.
Zone update has already been sent.
Barnes
&&
.AVIATION...
ISSUED 1233 PM CDT Fri Mar 14 2014
Cold front currently in the Illinois River Valley will work its
way eastward through central Illinois over the next couple of
hours. HRRR seems to be handling timing of FROPA fairly well, so
will follow it closely this afternoon. Winds will veer to W/NW at
KPIA at 18z, then further east to KCMI by around 21z. Gusts will
generally be in the 20 to 25kt range, but will occasionally reach
30kt at both KBMI and KCMI. Gusty winds will subside by sunset,
then will go light/variable overnight as high pressure builds into
the area. Once the high begins to shift off to the east, a light
southeasterly return flow will develop by Saturday morning. High
clouds currently blanketing central Illinois will shift eastward
with the front this afternoon, followed by clear skies tonight.
After that, a band of mid-level clouds associated with warm
advection will develop mainly across Iowa into northern Illinois
by Saturday morning. Will include BKN cloud deck at around 12000ft
at both KPIA and KBMI after 14z accordingly.
Barnes
&&
.PREV DISCUSSION...
ISSUED 317 AM CDT Fri Mar 14 2014
Main concerns this package include chances of pcpn Sat night
through Sunday, and then again Tuesday through Wednesday. Models
have trended little further south with the weekend system as the
trough digs further into the southern plains. So a blend of the
models looks ok with this system. With the second system, the
models have come into much better agreement with timing, but still
differ with the way the upper level system looks. Will lean toward
maintaining going forecast, but with better agreement will need to
raise pops a little.
SHORT TERM...Today through Sunday
Tight gradient today will bring gusty winds to the area ahead of a
cold front that should move through the area during the afternoon.
Winds will then decrease behind the system as a narrow ridge of
high pressure moves across the region. Then the next system will
drop out of the northern plains toward the south. Models show a
somewhat split flow merging into one with the dominate surface low
becoming the one to the south. There is good agreement with what
should transpire on the surface in with the flow, so confidence is
high enough to warrant raising pops into the likely category for
Sunday in the south. As the system drops south, there is a chance
that some rain/snow will occur northwest of the IL river Sat
night. However, the main focus of pcpn will be in the south half
of the cwa as the system deepens a little and moves out of TX and
toward the southeastern US. How far north the pcpn will spread
into IL will depend on amount of moisture it pulls in and the
strength of the system. So will have likely pops in the southeast
with chance to the north. With surface flow from the northeast
Sunday night, temperatures should drop sufficiently so that p-type
over most of the area will be snow. Southeast IL will be closer to
some warmer air, so have p-type as rain or snow.
Temps will be spring-like today and in some areas tomorrow, but
then below normal temps are expected for Sunday with lots of
clouds, so it will return to being chilly.
LONG TERM...Sunday night through Thursday
Another narrow ridge of high pressure will move through the region
Sunday night through Monday night. Then the next system moves out
of the northern Rockies and into the plains by Tuesday. Southerly
winds ahead of the system should bring warmer temps back into the
region, so p-type will mainly be rain. Based on the track of the
low pressure remaining mainly west of most of the area, colder
temps should not advect back into the region until Wed night,
after the pcpn has departed the area. Moisture could be limited
with this system since the period of return flow is very short.
Temps will start on the cool side but then warm ahead of the Tue
night system. Should be some cooler air advecting into the area
behind the system as the upper level trough moves across the
region, but believe mid March sunshine could keep things from
getting too cool for end of the week.
Auten
&&
.ILX WATCHES/WARNINGS/ADVISORIES...
NONE.
&&
$$
AREA FORECAST DISCUSSION
NWS GRAND RAPIDS MI
148 PM EDT FRI MAR 14 2014
LATEST UPDATE...
AVIATION
.SYNOPSIS...
ISSUED AT 321 AM EDT FRI MAR 14 2014
BREEZY SOUTHWEST WINDS WILL PUSH TEMPERATURES INTO THE 40S TODAY FOR
MOST LOCATIONS. THE WARMER AIR WILL BE SHORT LIVED THOUGH AS A COLD
FRONT WILL DROP SOUTH THROUGH THE AREA THIS AFTERNOON AND EARLY
EVENING. THE COLD FRONT MAY LEAD TO SOME SCATTERED RAIN SHOWERS. A
REINFORCING COLD FRONT PASSES THROUGH OVERNIGHT WITH SOME SPRINKLES
CHANGING OVER TO A FEW FLURRIES. COLDER AIR WILL CONTINUE TO FILTER
INTO THE GREAT LAKES OVER THE WEEKEND AS ARCTIC HIGH PRESSURE
SETTLES INTO THE REGION. HIGHS WILL ONLY REACH THE 30S ON SATURDAY
AND THE 20S ON SUNDAY. DRY WEATHER IS FORECAST OVER THE WEEKEND DUE
TO THE AREA OF HIGH PRESSURE. THE NEXT WEATHER MAKER FOR SOUTHWEST
LOWER MICHIGAN WILL COME NEXT TUESDAY NIGHT INTO WEDNESDAY BRINGING
A CHANCE FOR RAIN AND SNOW.
&&
.UPDATE...
ISSUED AT 1103 AM EDT FRI MAR 14 2014
I INCREASED THE FORECAST HIGH TEMPERATURE TO THE UPPER 40S TO NEAR
50 AS A LOOK AT BOTH THE DTX AND MADIS ACARS GRR SOUNDINGS SHOW A
VERY STRONG INVERSION WITH TEMPERATURES AROUND 50F AT 3200 FT AGL
AT 8 AM. LITTLE QUESTION WITH THE MIXING ASSOCIATED WITH THE COLD
FRONT TEMPS WILL RISE TO NEAR 50 OVER THE AREA... EVEN WITH THE
SNOW COVER.
AS FOR PRECIPITATION THERE ARE SOME ECHOES ON RADAR NORTH OF
LUDINGTON AND THE HRRR SHOWS THEM MOVING EAST SOUTHEAST WITH THE
COLD FRONT THIS AFTERNOON. THE BAND SHOULD CROSS THE CWA DURING
THE AFTERNOON...REACHING EASTERN AREAS BY 4 PM OR SO.
TONIGHT THE RH IN THE LOWER 5000 FT IS ABOVE 90 PCT AND THERE IS
SOME LIFT... SO I EXPECT WE WILL SEE SOME LIGHT SHOWERS CHANGING
TO LIGHT SNOW SHOWERS AFTER MIDNIGHT. NONE OF THE PRECIPITATION
TODAY WILL AMOUNT TO ANYTHING SIGNIFICANT.
&&
.SHORT TERM...(TODAY THROUGH SUNDAY)
ISSUED AT 321 AM EDT FRI MAR 14 2014
LIMITED WEATHER CONCERNS EXIST IN THE SHORT TERM...BUT PERTAIN TO
CHANCES FOR PRECIPITATION TODAY AND TONIGHT. WE HAVE A DRY FORECAST
FOR SATURDAY THROUGH SUNDAY AS HIGH PRESSURE GRADUALLY SAGS SOUTH
INTO THE GREAT LAKES.
FOR TODAY...MODELS ARE FORECASTING THE COLD FRONT TO DROP SOUTH
THROUGH THE AREA THIS AFTERNOON AND EVENING. THE HRRR AND RAP HI-RES
SHORT TERM MODELS BOTH SHOW PRECIPITATION IN A NARROW RIBBON ALONG
THE COLD FRONT. HAVE 30 PCT CHC POPS NORTH AND 20 PCT SOUTH FOR THIS
AFTERNOON. IT APPEARS THERE WILL BE JUST ENOUGH DEPTH TO THE
MOISTURE FOR THIS TO OCCUR. TEMPS SHOULD NOSE INTO THE MIDDLE 40S
FOR HIGHS. READINGS ARE ALREADY AROUND 40 AT THIS TIME OF NIGHT
ACROSS SRN WI AND NRN IL WHICH IS OUR SOURCE REGION TODAY.
IT WILL BE BREEZY TODAY AS SOUTHWEST WINDS OF 15 TO 30 MPH CAN BE
EXPECTED. GUSTS IN EXCESS OF 30 MPH ARE A GOOD BET. A LLJ ON THE
ORDER OF 50 KNOTS OR SO WILL SWING THROUGH THE FORECAST AREA THIS
MORNING. HOLLAND IS ALREADY SEEING STRONG WINDS GUSTING TO 29 KNOTS.
TONIGHT...A SECONDARY COLD FRONT PASSES SOUTH THROUGH THE AREA AND
ENVISION A FEW SPRINKLES OR FLURRIES AROUND. HAVE MINIMAL POPS IN
TONIGHT...20 PCT...TO COVER THE LIGHT PRECIP. 850MB TEMPS BY
MORNING WILL HAVE FALLEN BACK TO -5 TO -10C FROM +7C THIS MORNING.
DRY WEATHER FORECAST FOR SATURDAY THROUGH SUNDAY BUT WE WILL NEED TO
KEEP AN EYE ON A BAROCLINIC ZONE THAT SETS UP ACROSS THE SOUTHERN
GREAT LAKES ON SATURDAY EVENING. MODELS HAVE SOME PRECIP
NEARBY...BUT JUST FEEL WE ARE GOING TO BE TOO DRY TO SQUEEZE
ANYTHING OUT.
.LONG TERM...(SUNDAY NIGHT THROUGH THURSDAY)
ISSUED AT 321 AM EDT FRI MAR 14 2014
FAIR WEATHER IS EXPECTED SUNDAY NIGHT THROUGH EARLY NEXT WEEK WITH A
RIDGE IN CONTROL OF THE WX PATTERN. TEMPS IN THIS TIME FRAME WILL BE
UNSEASONABLY COLD SUNDAY NIGHT AND MONDAY BEFORE UNDERGOING A
GRADUAL MODERATING TREND TUESDAY INTO WEDNESDAY AS SOUTHERLY FLOW
WAA DEVELOPS OUT AHEAD OF THE NEXT SYSTEM.
A FAIRLY STRONG LOW PRESSURE SYSTEM IS EXPECTED TO TRACK NE ACROSS
OUR REGION TOWARD THE MIDDLE OF NEXT WEEK BRINGING POTENTIAL FOR A
MIX OF RAIN AND SNOW TUESDAY NIGHT THROUGH WEDNESDAY. ANOTHER SHOT
OF COOLER AIR WILL LIKELY MOVE IN BEHIND THAT SYSTEM LATE IN THE
WEEK WITH POTENTIAL FOR SOME LINGERING LIGHT SNOW SHOWERS OR
FLURRIES INTO THURSDAY.
&&
.AVIATION...(FOR THE 18Z TAFS THROUGH 18Z SATURDAY AFTERNOON)
ISSUED AT 144 PM EDT FRI MAR 14 2014
WINDY CONDITIONS WILL CONTINUE THROUGH THE AFTERNOON AND GUSTS
OVER 25 KNOTS ARE LIKELY FOR ALL TAF SITES. A FEW BRIEF GUSTS TO
35 KNOTS ARE POSSIBLE AT KMKG AND KGRR. UPON SUNSET THE WINDS WILL
GRADUALLY DIMINISH. OTHERWISE VFR WEATHER WILL PREVAIL THROUGH
THE AFTERNOON. AFTER THE COLD FRONT GOES THROUGH LOWER CLOUDS WILL
MOVE IN LEADING TO MVFR CONDITIONS. THESE CLOUDS ARE CURRENTLY
LOCATED IN WRN WI. THIS SHIELD OF LOWER CLOUDS WILL SLOWLY PUSH
AWAY LATER TONIGHT THROUGH SATURDAY MORNING.
&&
.HYDROLOGY...
ISSUED AT 323 PM EDT THU MAR 13 2014
THE PERIODS OF WARMER TEMPERATURE WITH LIMITED RAIN MIXED WITH COLD
SNAPS OF LATE HAS RESULTED IN A DECREASE IN ICE DEPTH ON RIVERS AND
HAS DECREASED THE MOISTURE TRAPPED IN THE SNOW PACK. CURRENT SNOW
WATER EQUIVALENT VALUES ARE GENERALLY IN THE 2 TO 4 INCH RANGE. THIS
WEATHER PATTERN IS EXPECTED TO CONTINUE THROUGH THE NEXT WEEK...
WHICH SHOULD LOWER THE CHANCES FOR ICE JAM FORMATION AND FLOODING AS
WE PROGRESS INTO SPRING.
&&
.GRR WATCHES/WARNINGS/ADVISORIES...
MI...NONE.
LM...NONE.
&&
$$
UPDATE...WDM
SYNOPSIS...DUKE
SHORT TERM...DUKE
LONG TERM...LAURENS
AVIATION...MJS
HYDROLOGY...63
AREA FORECAST DISCUSSION
NWS BILLINGS MT
316 PM MDT FRI MAR 14 2014
.SHORT TERM...VALID FOR SAT AND SUN...
AN ENERGETIC SHORT WAVE TROUGH SEEN OVER EASTERN WA ON WATER VAPOR
IMAGERY AT 21 UTC WILL BRING RAIN AND SNOW SHOWERS AND GUSTY WINDS
AS IT CROSSES THE REGION TONIGHT INTO SAT.
FIRST OFF ALL...WE LET THE FLOOD WARNING FOR THE MUSSELSHELL RIVER
BASIN EXPIRE THIS AFTERNOON. THE RIVER IS BELOW FLOOD STAGE AND IT
APPEARS THAT SNOWMELT AROUND HARLOWTON AND TWODOT IS GOING SLOWLY.
THAT IS FAVORABLE FOR SLOW RUNOFF...AND SINCE THE RIVER ITSELF HAS
MUCH MORE CAPACITY FOR NEW WATER SINCE THE ICE HAS FLUSHED OUT AND
STAGES HAVE FALLEN CONSIDERABLY THIS WEEK...THE RISK OF ADDITIONAL
FLOODING APPEARS TO BE DIMINISHING. SOME MINOR RISES REMAIN LIKELY
THOUGH AND WE WILL KEEP A CLOSE EYE ON THAT AS SNOWMELT CONTINUES.
TONIGHT...A STRONG BATCH OF QG-FORCING WILL ACCOMPANY A SHORT WAVE
TROUGH ACROSS THE AREA...AND IT WILL BE VERY UNSTABLE ALOFT...WITH
MID-LEVEL LAPSE RATES IN EXCESS OF 7 C/KM. THE POTENCY OF THE WAVE
IS BORNE OUT BOTH BY STARK DRYING IN ITS WAKE UPSTREAM OVER WA AND
OR ON AFTERNOON WATER VAPOR IMAGES...AND THE LIGHTNING THAT/S ALSO
ACCOMPANYING CONVECTION WITH THE WAVE. THE 12 UTC GUIDANCE AND THE
MORE RECENT HIGH-RESOLUTION GUIDANCE LIKE THE HRRR AGREES WELL AND
SUGGESTS RAIN SHOWERS QUICKLY SPREADING ACROSS THE AREA DURING THE
EVENING...WITH THE HIGHEST PROBABILITIES OF MOISTURE AWAY FROM THE
DOWNSLOPE INFLUENCE /IN OTHER WORDS...EAST OF A ROUNDUP...BILLINGS
AND LODGE GRASS LINE/. HOWEVER...GIVEN THE STRONG FORCING EMBEDDED
IN AN UNSTABLE LAYER...SOME SHOWERS ARE LIKELY EVEN WHERE WESTERLY
LOW-LEVEL FLOW WOULD NORMALLY NEGATE THAT ACTIVITY. SUBSIDENCE AND
DRYING WILL QUICKLY WORK INTO SOUTH CENTRAL MT AFTER 06 UTC BEHIND
THE MID-LEVEL TROUGH AXIS...SO THE BRUNT OF SHOWERS WILL BE ACROSS
SOUTHEASTERN MT BY LATE IN THE NIGHT. THERMAL PROFILES SUGGEST THE
PRECIPITATION WILL MAINLY BE RAIN TONIGHT...BUT WE HAVE A RAIN AND
SNOW MIX IN THE FORECAST AFTER 09 UTC WHEN WET BULB COOLING SHOULD
HAVE A BETTER CHANCE OF ALLOWING FROZEN HYDROMETEORS TO MAKE IT TO
THE GROUND.
SAT...STRONG LOW- AND MID-LEVEL WINDS WITH 850- AND 700-HPA SPEEDS
OF 40 TO 50 KT WILL BE IN PLACE DURING THE DAY ON THE BACK SIDE OF
THE SHORT WAVE...AND SIGNIFICANT SURFACE PRESSURE RISES WILL TRACK
ACROSS EASTERN MT DURING THE MORNING. WE EXPECT A WINDY DAY...WITH
A LACK OF STRONG COLD AIR ADVECTION OR STRONG LOW-LEVEL SUBSIDENCE
KEEPING A BIT OF A LID ON THE FULL POTENTIAL OF THE WINDS ALOFT IN
MOST AREAS. WE EXPECT GUSTS TO AROUND 50 MPH AT SHERIDAN WHERE THE
12 UTC GUIDANCE SHOWS SOME BETTER SUBSIDENCE IN THE BOUNDARY LAYER
BUT THOSE SAME MODELS BACKED OFF A BIT ON WIND SPEEDS IN THE WELL-
MIXED LAYER AT SHERIDAN...SO WE HELD OFF ON A HIGH WIND WATCH. THE
SOUTHEASTERN PART OF MT WILL BE IN LINE FOR RAIN AND SNOW SAT WITH
POTENTIAL WRAP-AROUND...TROWAL-LIKE MOISTURE IMPACTING AREAS ALONG
AND EAST OF A LINE FROM HYSHAM TO LAME DEER. THE 12 UTC MODELS DID
BACK OFF ON THAT POTENTIAL A BIT...BUT THE 09 UTC SREF STAYED WITH
THAT THEME WITH 70+ PERCENT PROBABILITIES OF MOISTURE...AND THE 18
UTC NAM ARRIVED WITH AN EVEN MORE ROBUST BATCH OF WRAP-AROUND SNOW
AS THE STRONG SHORT WAVE HEADS SOUTHEAST. WE DON/T FEEL THIS EVENT
WILL NEED WINTER WEATHER HEADLINES...BUT THAT WILL BEAR WATCHING.
BY SUN...TRANSIENT...BUT DISTINCT RIDGING ALOFT WILL TAKE HOLD AND
WE STILL EXPECT A VERY MILD DAY WITH HIGHS WELL INTO THE 60S. LEE-
SIDE PRESSURE FALLS WILL DRIVE GUSTY WINDS...ESPECIALLY AROUND THE
LIVINGSTON AREA...WHERE GAP ENHANCEMENT IS POSSIBLE. IT APPEARS WE
WILL NEED A WIND ADVISORY AROUND LIVINGSTON WITH A LATER FORECAST.
THE 12 UTC GFS AND ECMWF BOTH SHOW A 10 TO 15 HPA SURFACE PRESSURE
GRADIENT BETWEEN IDAHO FALLS AND LEWISTOWN SUN AND SUN NIGHT...AND
THAT IS USUALLY ENOUGH FOR 60 MPH GUSTS AT LIVINGSTON. SCHULTZ
.LONG TERM...VALID FOR MON...TUE...WED...THU...FRI...
MODELS ARE IN DECENT AGREEMENT EARLY IN THE EXTENDED...THOUGH THE
ECMWF FORECASTS A MORE AMPLIFIED UPPER LEVEL TROUGH TO MOVE
THROUGH THE REGION MONDAY INTO TUESDAY. MORE DIFFERENCES IN MODEL
SOLUTIONS EXIST LATE IN THE EXTENDED AS THEY ARE HAVING SOME
TROUBLE WITH ANOTHER SYSTEM LATE THURSDAY INTO FRIDAY. DURING
THAT TIMEFRAME...THE GFS FORECASTS A DEEPER UPPER LEVEL TROUGH TO
MOVE ACROSS THE REGION...WHILE THE ECMWF WASHES THE TROUGH OUT IN
ZONAL FLOW AS ENHANCED TROUGHING TRIES TO ESTABLISH ITSELF OVER
ALASKA.
MONDAY INTO MONDAY NIGHT...A STORM SYSTEM PUSHES FROM THE PACIFIC
NW INTO THE NORTHERN AND CENTRAL ROCKIES. THE STRONGEST DYNAMICS
TRACK ACROSS THE CENTRAL ROCKIES...A SCENARIO THAT FAVORS THE
HEAVIEST PRECIP ACROSS THE SOUTHERN HALF OF THE CWA. AS SUCH...I
CONTINUED TO INCREASE POPS THERE AND UPPED PRECIP AMOUNTS ACROSS
THE SOUTHERN HALF OF THE CWA...TOO. IT WILL NOT HURT THAT
MOIST...WRAPAROUND...UPSLOPE FLOW WILL IMPACT THE
SOUTHERN/SOUTHEAST HILLS...AS WELL AS THE MOUNTAINS. THE HEAVIEST
PRECIP LOOKS TO OCCUR LATE MONDAY INTO MONDAY NIGHT...INCREASING
THE POTENTIAL FOR ACCUMULATING SNOW. IT IS A LITTLE EARLY TO TELL
EXACTLY HOW MUCH SNOW WILL FALL...BUT SEVERAL INCHES ARE POSSIBLE
IN THE HIGHER ELEVATIONS.
TUESDAY...THE AREA REMAINS IN NW FLOW ALOFT. SHORTWAVE ENERGY WILL
WORK WITH WHAT IS EXPECTED TO BE AN UNSTABLE AIRMASS AND RESIDUAL
MOISTURE TO PRODUCE SCATTERED RAIN AND SNOW SHOWERS AS TEMPS ONLY
WARM INTO THE UPPER 30S TO MID 40S.
UPPER LEVEL RIDGING BUILDS IN WEDNESDAY INTO EARLY THURSDAY...SO
MILDER AND MOSTLY DRY CONDITIONS ARE ANTICIPATED. AS PREVIOUSLY
MENTIONED...MODEL DIFFERENCES MAKE IT DIFFICULT TO PREDICT WHAT
WILL OCCUR LATE THURSDAY INTO THURSDAY NIGHT. IT DOES APPEAR THAT
SOME SHORTWAVE ENERGY MAY MOVE ACROSS THE REGION...SO I INCREASED
PRECIP CHANCES SLIGHTLY ACROSS WESTERN AND CENTRAL AREAS. STC
&&
.AVIATION...
A PACIFIC COLD FRONT WILL MOVE ACROSS THE AREA OVERNIGHT. AHEAD OF
THE FRONT...RAIN AND SNOW SHOWERS WILL CONTINUE TO INCREASE IN
COVERAGE ACROSS WESTERN AND CENTRAL ROUTES THROUGH THIS EVENING.
THE RAIN AND SNOW SHOWERS WILL PRODUCE AREAS OF MVFR...AND
POSSIBLY SOME IFR...AS THEY CONTINUE TO SPREAD EASTWARD ACROSS THE
REGION OVERNIGHT. WEST TO NORTHWEST WINDS MAY WEAKEN A BIT THIS
EVENING...BUT WILL INCREASE AGAIN OVERNIGHT WITH THE PASSAGE OF
THE COLD FRONT. EXPECT MOUNTAIN OBSCURATION INTO EARLY SATURDAY.
STC
&&
.PRELIMINARY POINT TEMP/POPS...
SAT SUN MON TUE WED THU FRI
-----------------------------------------------------------
BIL 039/050 033/064 041/052 030/045 026/050 031/054 032/053
53/O 01/N 17/R 74/W 21/B 11/B 21/B
LVM 032/046 029/055 037/047 024/042 022/047 027/052 028/051
62/O 00/N 19/R 74/J 21/B 11/B 22/W
HDN 036/049 031/064 041/054 030/046 028/052 029/055 029/056
75/O 11/N 17/R 75/W 21/B 11/B 21/B
MLS 036/042 029/062 040/052 031/044 027/049 028/055 030/054
88/O 11/N 27/R 74/W 21/B 11/B 21/B
4BQ 035/044 026/063 038/055 031/044 027/048 028/054 029/053
77/O 11/B 16/R 75/W 21/B 11/B 00/B
BHK 033/038 023/060 037/051 028/042 024/047 027/051 027/051
88/O 11/N 26/R 74/W 21/B 01/B 11/B
SHR 032/046 025/061 035/054 028/042 023/047 025/053 024/051
65/O 11/B 16/R 75/W 21/B 11/B 11/B
&&
.BYZ WATCHES/WARNINGS/ADVISORIES...
MT...NONE.
WY...NONE.
&&
$$
WEATHER.GOV/BILLINGS
AREA FORECAST DISCUSSION
NWS NORTH PLATTE NE
1235 PM CDT FRI MAR 14 2014
.UPDATE...
ISSUED AT 925 AM CDT FRI MAR 14 2014
THE HOURLY RAPID REFRESH MODELS ARE INDICATING MUCH LOWER
DEWPOINTS IN THE WESTERN NEBRASKA SANDHILLS AND THE EASTERN
PANHANDLE THAN THE STATISTICAL OUTPUT IS. AS A RESULT...WE ARE
UPDATING THE DEWPOINT AND RELATIVE HUMIDITY GRIDS FOR LOWER
VALUES...THOUGH NOT QUITE TO THE SINGLE DIGIT DEWPOINTS INDICATED
BY THE HRRR AND RAP13 SHORT TERM MODELS.
&&
.SHORT TERM...(TODAY AND TONIGHT)
ISSUED AT 358 AM CDT FRI MAR 14 2014
A COLD FRONT PUSHED THROUGH THE AREA YESTERDAY AND CURRENTLY IS
DRAPED FROM SOUTHERN MN THROUGH EASTERN NE AND ALONG THE WESTERN
KS/NE BORDER. WINDS BEHIND THE FRONT HAVE BEEN GENERALLY 10-15 MPH
EARLY THIS MORNING. HOWEVER...EXPECT THE WINDS TO INCREASE QUICKLY
IN THE FAR EAST /ONEILL AREA/ ONCE THE SUN COMES UP. EXPECT THE
STRONGEST WINDS IN THE MORNING TO EARLY AFTERNOON PERIOD BEFORE
DECREASING IN THAT AREA. OTHERWISE...PRESSURE GRADIENT DECREASES
ACROSS THE ENTIRE AREA TODAY AS HIGH PRESSURE FILLS IN BEHIND THE
COLD FRONT. EXPECT SKIES TO BE MOSTLY SUNNY TODAY WITH SOME
INCREASING CLOUD COVER TONIGHT AHEAD OF THE NEXT SYSTEM. HAVE GONE
A LITTLE ABOVE GUIDANCE WITH HIGHS FOR TODAY...CLOSER TO THE BIAS
CORRECTED DATA. DRY CONDITIONS AND GUSTY WINDS IN THE EAST WILL
MAKE FIRE DANGER ELEVATED TODAY...MORE DETAILS IN THE FIRE WX
DISCUSSION.
.LONG TERM...(SATURDAY THROUGH THURSDAY)
ISSUED AT 358 AM CDT FRI MAR 14 2014
CONCERNS THROUGH THIS FORECAST PERIOD ARE WITH PRECIPITATION
CHANCES/TEMPERATURES SATURDAY AND SATURDAY NIGHT...THEN FOCUS TURNS
TO A STORM SYSTEM SET TO MOVE ACROSS THE CENTRAL CONUS FOR THE FIRST
HALF OF THE NEXT WORK WEEK.
A SHORTWAVE TROUGH...NOW OFF THE BRITISH COLUMBIA COAST WILL MOVE
INLAND TODAY...THEN WILL DIG DOWN INTO THE BROAD TROUGH SITUATED
OVER THE CENTRAL AND EASTERN CONUS. THE MODELS ARE IN GOOD AGREEMENT
WITH HAVING TWO SEPARATE PIECES OF ENERGY AS THE SYSTEM MOVES INTO
THE PLAINS. THE FIRST DROPS IN ACROSS WESTERN SOUTH DAKOTA AND INTO
EASTERN NEBRASKA...WHILE THE SECOND IS FURTHER SOUTH AND MOVES DOWN
INTO THE SOUTHERN PLAINS. MODELS HAVE TRENDED A BIT QUICKER BRINGING
THE COLD FRONT THROUGH ON SATURDAY AS IT IS NOW THROUGH THE FORECAST
AREA BY MID MORNING. AS THERE IS GOOD AGREEMENT WITH THIS...HAVE
ADJUSTED TEMPERATURES DOWN A FEW DEGREES. ALSO INCREASED WINDS ON
SATURDAY BEHIND THE FRONT. THE PRESSURE GRADIENT TIGHTENS UP AND
FORECAST SOUNDINGS SHOWING GOOD MIXING TO 750MB WITH WINDS AT THAT
LEVEL UP AROUND 30KTS.
LOOKING AT PRECIPITATION CHANCES...THERE IS GOOD LARGE-SCALE LIFT
ACROSS THE AREA BEGINNING SATURDAY...WITH THE STRONGEST LIFT SEEN
OVER NORTHERN NEBRASKA FROM SATURDAY AFTERNOON INTO THE EVENING
HOURS. THEN LOOKING AT MOISTURE PROFILES...CROSS SECTIONS SHOW
SIGNIFICANT MOISTURE OVER NORTHWEST NEBRASKA BY MID-DAY SATURDAY AND
INCREASES THROUGH THE DAY. HOWEVER THERE IS A SUBSTANTIAL DRY LAYER
BELOW 800MB THAT PRESENTS AN ISSUE FOR MEASURABLE PRECIPITATION. THE
LOW LEVELS DO EVENTUALLY SATURATE...BUT NOT UNTIL AFTER 00Z SUNDAY
IN MOST LOCATIONS. WITH THE AMOUNT OF LIFT...WILL LIKELY BE SEEING
PRECIPITATION BY EARLY AFTERNOON OVER NORTHWEST NEBRASKA THEN
SPREADING EAST...JUST HOW MUCH ACCUMULATES IS IN QUESTION. AND...THE
PRECIPITATION TYPE OF WHAT REACHES THE GROUND IS ALSO QUESTIONABLE.
SURFACE TEMPERATURES STAY ABOVE FREEZING THROUGHOUT THE DAY SATURDAY
BUT THE WET-BULB PROFILE WOULD SUGGEST THERE COULD BE SNOW.
THEREFORE WENT WITH A RAIN/SNOW MENTION FOR THE DAYTIME HOURS.
COLDER AIR MOVES IN DURING THE EVENING AND OVERNIGHT HOURS AND AS
THE COLUMN SATURATES CHANGED EVERYTHING OVER TO SNOW AFTER MIDNIGHT.
THE NEXT SYSTEM OF CONCERN MOVES OUT OF THE NORTHERN PACIFIC SUNDAY
AND INTO THE PACIFIC NORTHWEST SUNDAY NIGHT. MODELS ARE FINALLY
STARTING TO COME INTO SOME AGREEMENT WITH HOW THIS SYSTEM WILL
PROGRESS ACROSS THE WESTERN AND CENTRAL PARTS OF THE CONUS...SO
CONFIDENCE IS STARTING TO INCREASE FOR THE EARLY PARTS OF NEXT WEEK.
THAT BEING SAID...THERE ARE STILL DIFFERENCES IN THE STRENGTH OF THE
SYSTEM WITH THE MODEL THAT IS STRONGEST BEING THE OUTLIER. FOR THIS
FORECAST CYCLE KEPT THE FORECAST TRENDED TOWARDS THE MORE CONSISTENT
SOLUTION...WHICH FOLLOWS THE ECMWF AND GEM.
THE SHORTWAVE TROUGH MOVES INTO THE NORTHERN US ROCKIES BY THE END
OF THE DAY MONDAY...WHILE SURFACE CYCLOGENESIS DEVELOPS A BROAD
SURFACE LOW FROM EASTERN MONTANA/WYOMING INTO EASTERN COLORADO. THIS
WILL BRING ABOUT GOOD WARM AIR ADVECTION IN THE LOW LEVELS...AND
WITH A STRONG THERMAL RIDGE ALOFT 850MB TEMPERATURES ARE VERY WARM
AT 10C TO 18C ACROSS PARTS OF THE AREA /DEPENDENT ON THE MODEL/.
AGAIN...WITH THE MODEL DIFFERENCES HAVE NOT JUMPED ON THE EXTREMELY
WARM SOLUTIONS BUT IF THEY CONTINUE TO COME INTO BETTER AGREEMENT
MAY NEED TO DO FURTHER ADJUSTING UP ON HIGH TEMPERATURES MONDAY.
WARMER TEMPERATURES WOULD LIKELY LEAD TO DEEP MIXING AND COULD BRING
DRIER AIR AND STRONGER WINDS TO THE SURFACE. MONDAY WILL NEED TO BE
MONITORED IN THE COMING DAYS FOR THE POTENTIAL FOR BEING A CRITICAL
FIRE WEATHER DAY.
THEN LOOKING TO TUESDAY...THE UPPER LOW CROSSES THE
PLAINS...BRINGING A STRONG COLD FRONT ACROSS THE AREA...AND THUS
LEADING TO PRECIPITATION CHANCES AND STRONG NORTHWEST WINDS ACROSS
THE FORECAST AREA. THE MODEL DIFFERENCES RANGE FROM THE UPPER LOW
MOVING ACROSS SOUTH DAKOTA/NEBRASKA FROM THE ECMWF/GEM TO THE GFS
SHOWING THE LOW CROSSING KANSAS. THESE DIFFERENT SOLUTIONS LEAD TO
VERY DIFFERENT SENSIBLE WEATHER...ALTHOUGH BOTH WOULD BE COOLER
ALONG WITH CHANCES FOR PRECIPITATION. AGAIN...KEPT WITH THE MORE
CONSISTENT SOLUTION AND DIDN/T BUY INTO THE GFS AT THIS TIME. FOR
NOW...HAVE THE HIGHER CHANCES FOR PRECIPITATION DURING THE DAY
TUESDAY...WITH STRONG SUBSIDENCE MOVING IN TUESDAY NIGHT TO QUICKLY
PUSH ANY PRECIPITATION EAST OF THE AREA. PRECIPITATION TYPE IS
RAIN/SNOW IN THE CURRENT FORECAST AS SURFACE TEMPERATURES ARE
LOOKING TO BE IN THE UPPER 30S TO LOW 40S...YET DYNAMIC COOLING
COULD CHANGE PRECIPITATION TO SNOW.
BEYOND TUESDAY NIGHT...THE PATTERN KEEPS COOLER AIR ACROSS THE AREA
WITH NO SIGNIFICANT SYSTEMS TO MOVE OVER THE REGION THROUGH THE END
OF THE WEEK. THEREFORE NEAR NORMAL TEMPERATURES AND DRY CONDITIONS
ARE IN THE FORECAST FOR THE REMAINDER OF NEXT WEEK.
&&
.AVIATION...(FOR THE 18Z TAFS THROUGH 18Z SATURDAY AFTERNOON)
ISSUED AT 1232 PM CDT FRI MAR 14 2014
A FRONT COMING THROUGH NEBRASKA SATURDAY WILL BRING A WIND SHIFT
TO THE NORTH-NORTHWEST WITH THE SPEED INCREASING TO 14-18G22-28KT.
OTHERWISE...WE DO NOT EXPECT ANY ADVERSE IMPACT ON FLIGHT
OPERATIONS DUE TO CEILING AND VISIBILITY. AS THE FRONT GOES
THROUGH...CEILING WILL DECREASE TO 4000-5000 FEET AGL.
&&
.FIRE WEATHER...
ISSUED AT 925 AM CDT FRI MAR 14 2014
USING LOWER DEWPOINTS THAN THE PREVIOUS FORECAST HAD INDICATED IS
BRINGING THE RELATIVE HUMIDITY IN THE EASTERN PANHANDLE AND
WESTERN NEBRASKA SANDHILLS TO 15-20 PERCENT. THE RELATIVE HUMIDITY
IS STILL JUST ABOVE THE CRITICAL THRESHOLD AND WIND GUSTS ARE NOT
EXPECTED TO REACH 25 MPH...SO WE WILL NOT ISSUE ANY FIRE WEATHER
HEADLINES. THE SITUATION WILL NEED TO BE MONITORED THROUGH THE DAY
FOR THE POSSIBILITY OF CRITICAL FIRE PARAMETERS.
&&
.LBF WATCHES/WARNINGS/ADVISORIES...
NONE.
&&
$$
UPDATE...SPRINGER
SHORT TERM...KNUTSVIG
LONG TERM...BROOKS
AVIATION...SPRINGER
FIRE WEATHER...SPRINGER
AREA FORECAST DISCUSSION
NWS CLEVELAND OH
658 PM EDT FRI MAR 14 2014
.SYNOPSIS...
A CLIPPER SYSTEM MOVING THROUGH SOUTHERN ONTARIO INTO SOUTHERN
QUEBEC WILL DRAG A COLD FRONT ACROSS THE AREA THIS EVENING AND
EARLY TONIGHT. A SECOND COLD FRONT WILL WEAKEN AS IT APPROACHES
EARLY SATURDAY. SUNDAY A STORM SYSTEM DEVELOPING IN THE MID
MISSISSIPPI VALLEY WILL MOVE TO THE SOUTHEASTERN STATES SUNDAY AS
HIGH PRESSURE BUILDS ACROSS THE GREAT LAKES.
&&
.NEAR TERM /UNTIL 6 AM SATURDAY MORNING/...
THE GUSTY WINDS WILL BE DECREASING AFTER SUNSET...ISSUED A SPECIAL
WEATHER STATEMENT TO TALK ABOUT THIS. CLOUDS ALSO ON THE INCREASE
AHEAD OF THE FRONT. ALL THE MODELS INDICATE THAT RAIN SHOWERS WILL
DEVELOP AHEAD OF THE FRONT THIS EVENING FROM NW PA DOWN TO MFD AND
EAST. COLDER AIR WILL BE FLOWING IN AFTER MIDNIGHT WITH A SWITCH
OVER TO SNOW SHOWERS. THE BEST CHANCE FOR ANY SNOW ACCUMULATION
WILL BE IN THE SNOW BELT. THE AMOUNTS SHOULD BE AN INCH OR LESS.
NO CHANGE TO TEMPERATURES AT THIS TIME.
PREVIOUS DISCUSSION...
MOISTURE IS INCREASING TOWARD THE AREA FROM THE SOUTHWEST
WHILE TO OUR NORTHWEST A COLD FRONT ALONG WITH ITS LIMITED
MOISTURE...WAS APPROACHING. SKIES ACROSS THE AREA NOW ARE PARTLY
CLOUDY ALTHOUGH EXPECT CLOUDS TO INCREASE AS THESE TWO FEATURES
CONVERGE ON THE REGION. FOLLOWED THE NAM TIMING NEAR TERM. BY
EARLY EVENING THE NAM ALONG WITH THE HRRR SHOWS DEEPENING MOISTURE
AND DEVELOPING SHOWERS BASICALLY ON A LINE FROM KERI TO
KMFD...INCREASING IN COVERAGE AS THEY MOVE EAST THROUGH THE MID
EVENING HOURS. FEEL THE MAV GUIDANCE POPS ARE OVERSTATED AND WILL
GO CLOSER TO THE MET NUMBERS WITH SLIGHT CHANCE CENTRAL AND WEST
UP TO LIKELY JUST IN NWRN PA. PTYPE LIKELY RAIN THROUGH THE
EVENING MIXING WITH/CHANGING TO SNOW FOR ANY LEFTOVER PRECIP AFTER
MIDNIGHT. LOWS AROUND 30. WINDS QUITE GUSTY AND CLOSE TO ADVISORY
LEVELS IN A FEW SPOTS BUT OVERALL ARE BELOW CRITERIA. DO EXPECT
WINDS TO BE DECREASING THROUGH THE EVENING.
&&
.SHORT TERM /6 AM SATURDAY MORNING THROUGH MONDAY NIGHT/...
SECONDARY COLD FRONT DROPS INTO THE AREA EARLY SATURDAY. COLDEST
AIR WILL BE ACROSS NWRN PA AT AROUND -8 TO -10C. COULD BUBBLE A
LITTLE MOISTURE OFF THE LAKE SO CONTINUED A CHANCE OF SNOW SHOWERS
NWRN PA SATURDAY INTO EARLY SATURDAY NIGHT. DONT EXPECT IT TO
AM MOUNT TO MUCH. SATURDAY NIGHT EXPECT INCREASING CLOUDS/MOSTLY
CLOUDY SKIES AS MOISTURE AHEAD OF THE NEXT STORM SYSTEM
OVERSPREADS THE AREA. MODELS SHOW THE LOW MOVING FROM THE MID
MISSISSIPPI VALLEY TO THE SOUTHEASTERN STATES ON MONDAY. MEANWHILE
MODELS SHOW THE CLOUDS AND SNOW ASSOCIATED WITH THE SYSTEM
REACHING NORTH INTO CENTRAL OHIO WITH THE CLOUDS EXTENDING FURTHER
NORTH INTO NRN OHIO. THE NAM IS FURTHEST NORTH WITH THE PRECIP
ACCUMULATING A COUPLE INCHES OF SNOW ACROSS THE SOUTH/SOUTHEAST ON
SUNDAY WITH ANOTHER INCH SUNDAY EVENING. THE GFS KEEPS IT ALL
SOUTH. FOR NOW WILL BRING A CHANCE POP INTO THE SOUTH/SOUTHEAST
SUNDAY AFTERNOON AND CONTINUE INTO SUNDAY NIGHT. COULD SEE A
LITTLE LEFTOVER MONDAY FAR SOUTHEAST BUT FOR THE MOST PART WILL BE
A DRY DAY. TEMPS BELOW TO MUCH BELOW NORMAL THROUGH THE SHORT TERM.
&&
.LONG TERM /TUESDAY THROUGH FRIDAY/...
MODELS CONTINUE TO STRUGGLE WITH THE TIMING OF SYSTEMS THROUGH A
FAST UPPER LEVEL ATTEMPT AT ZONAL FLOW. EACH SYSTEM WILL NOT BE ABLE
TO PICK UP ALL THAT MUCH MOISTURE AS THEY PASS BUT WILL BE ENOUGH OF
A NUISANCE THAT WE WILL NEED TO MENTION SOME LIGHT RAIN/SNOW THROUGH
THE EXTENDED. RAIN MAINLY DURING THE DAY WITH SOME LIGHT SNOW
POSSIBLE AT NIGHT. THE BETTER CHANCES AT THIS TIME APPEAR TO BE
TUESDAY NIGHT INTO WEDNESDAY AND AGAIN ON THURSDAY.
HIGHS THROUGH THE EXTENDED LOOK TO BE 3 TO 5 DEGREES EITHER SIDE OF
A SEASONAL AVERAGE IN THE LOWER TO MIDDLE 40S.
&&
.AVIATION /18Z SATURDAY THROUGH WEDNESDAY/...
CEILINGS WILL SLOWLY LOWER INTO THE EVENING AS A COLD FRONT
APPROACHES. THE FRONT WILL MOVE ACROSS THE REGION FROM WEST TO
EAST THROUGH 09Z WITH SOME LIGHT PRECIPITATION POSSIBLE AHEAD OF
AND JUST IN ITS WAKE. IT APPEARS IT WILL BE LIQUID THROUGH AROUND
05Z THEN TRANSITION OVER TO SOME LIGHT SNOW. THE LIGHT SNOW COULD
BE ENHANCED ACROSS NE OH AND NW PA WITH FLOW OFF OF LAKE ERIE. FOR
NOW WILL ONLY MENTION MVFR CONDITIONS IN THE SNOW ACROSS THE
EASTERN PORTION OF THE COUNTY WARNING AREA...GENERALLY EAST OF
KCGF TO KCAK LINE. ANY PATCHES OF MVFR ACROSS THE EAST SHOULD LIFT
BY LATE SATURDAY MORNING.
OTHERWISE GUSTY SOUTHWEST WINDS WILL CONTINUE INTO THE EVENING.
THE THICKER HIGH LEVEL CLOUD COVER OVER THE REGION HAS BEEN
ENOUGH TO HELP LIMIT MIXING. EXPECT THIS TREND TO CONTINUE WITH
GUSTS REMAINING UNDER 30 KNOTS AT MOST LOCATIONS. THERE IS A SLIM
CHANCE THAT LOCATIONS NEAR THE LAKESHORE COULD GUST TO 35 KNOTS.
WINDS WILL DECREASE SLIGHTLY IN THE WAKE OF THE FRONT BUT WILL
BECOME WESTERLY. GUSTS SHOULD INCREASE AGAIN ON SATURDAY BUT
SHOULD BE UNDER 25 KNOTS.
.OUTLOOK...NON VFR POSSIBLE SUNDAY...MAINLY SOUTH IN LIGHT SNOW.
&&
.MARINE...
SOUTHWEST WINDS WILL BE GUSTY ON THE LAKE UNTIL A FRONTAL BOUNDARY
PASSES ACROSS LAKE ERIE TONIGHT. THE FRONT SHOULD CLEAR THE EAST END
OF THE LAKE BETWEEN 06Z AND 09Z. SINCE WE ARE IN A WARM ADVECTION
PATTERN IT IS TYPICALLY DIFFICULT TO GET THE STRONGEST WINDS DOWN TO
THE LAKE SURFACE. HOWEVER WE STILL COULD SEE A FEW GUSTS IN EXCESS
OF 35 KNOTS BUT DO NOT THINK IT WILL BE PERSISTENT ENOUGH TO NEED A
GALE. HIGH PRESSURE WILL RIDGE ONTO THE LAKE FROM THE NORTH SATURDAY
NIGHT AS A STORM SYSTEM MOVES SOUTH OF THE OHIO RIVER VALLEY THROUGH
SUNDAY. EAST TO NORTHEAST WINDS WILL INCREASE AS THE LOW PASSES BUT
IT DOES NOT APPEAR THAT WINDS ON THE LAKE WILL EXCEED 30 KNOTS. WE
WILL THEN MONITOR THE MOVEMENT OF LOW PRESSURE ACROSS THE CENTRAL
LAKES TUESDAY NIGHT INTO WEDNESDAY NIGHT. WINDS WILL INCREASE FROM
THE SOUTHWEST IN ADVANCE OF THE LOW. GUSTY NORTHWEST WINDS WILL ALSO
BE POSSIBLE IN ITS WAKE.
&&
.CLE WATCHES/WARNINGS/ADVISORIES...
OH...NONE.
PA...NONE.
MARINE...NONE.
&&
$$
SYNOPSIS...TK
NEAR TERM...KIELTYKA/TK
SHORT TERM...TK
LONG TERM...MULLEN
AVIATION...MULLEN
MARINE...MULLEN
AREA FORECAST DISCUSSION
NWS CLEVELAND OH
338 PM EDT FRI MAR 14 2014
.SYNOPSIS...
A CLIPPER SYSTEM MOVING THROUGH SOUTHERN ONTARIO INTO SOUTHERN
QUEBEC WILL DRAG A COLD FRONT ACROSS THE AREA THIS EVENING AND
EARLY TONIGHT. A SECOND COLD FRONT WILL WEAKEN AS IT APPROACHES
EARLY SATURDAY. SUNDAY A STORM SYSTEM DEVELOPING IN THE MID
MISSISSIPPI VALLEY WILL MOVE TO THE SOUTHEASTERN STATES SUNDAY AS
HIGH PRESSURE BUILDS ACROSS THE GREAT LAKES.
&&
.NEAR TERM /UNTIL 6 AM SATURDAY MORNING/...
MOISTURE IS INCREASING TOWARD THE AREA FROM THE SOUTHWEST WHILE TO
OUR NORTHWEST A COLD FRONT ALONG WITH ITS LIMITED MOISTURE...WAS
APPROACHING. SKIES ACROSS THE AREA NOW ARE PARTLY CLOUDY ALTHOUGH
EXPECT CLOUDS TO INCREASE AS THESE TWO FEATURES CONVERGE ON THE
REGION. FOLLOWED THE NAM TIMING NEAR TERM. BY EARLY EVENING THE
NAM ALONG WITH THE HRRR SHOWS DEEPENING MOISTURE AND DEVELOPING
SHOWERS BASICALLY ON A LINE FROM KERI TO KMFD...INCREASING IN
COVERAGE AS THEY MOVE EAST THROUGH THE MID EVENING HOURS. FEEL THE
MAV GUIDANCE POPS ARE OVERSTATED AND WILL GO CLOSER TO THE MET
NUMBERS WITH SLIGHT CHANCE CENTRAL AND WEST UP TO LIKELY JUST IN
NWRN PA. PTYPE LIKELY RAIN THROUGH THE EVENING MIXING
WITH/CHANGING TO SNOW FOR ANY LEFTOVER PRECIP AFTER MIDNIGHT. LOWS
AROUND 30. WINDS QUITE GUSTY AND CLOSE TO ADVISORY LEVELS IN A FEW
SPOTS BUT OVERALL ARE BELOW CRITERIA. DO EXPECT WINDS TO BE
DECREASING THROUGH THE EVENING.
&&
.SHORT TERM /6 AM SATURDAY MORNING THROUGH MONDAY NIGHT/...
SECONDARY COLD FRONT DROPS INTO THE AREA EARLY SATURDAY. COLDEST
AIR WILL BE ACROSS NWRN PA AT AROUND -8 TO -10C. COULD BUBBLE A
LITTLE MOISTURE OFF THE LAKE SO CONTINUED A CHANCE OF SNOW SHOWERS
NWRN PA SATURDAY INTO EARLY SATURDAY NIGHT. DONT EXPECT IT TO
AM MOUNT TO MUCH. SATURDAY NIGHT EXPECT INCREASING CLOUDS/MOSTLY
CLOUDY SKIES AS MOISTURE AHEAD OF THE NEXT STORM SYSTEM
OVERSPREADS THE AREA. MODELS SHOW THE LOW MOVING FROM THE MID
MISSISSIPPI VALLEY TO THE SOUTHEASTERN STATES ON MONDAY. MEANWHILE
MODELS SHOW THE CLOUDS AND SNOW ASSOCIATED WITH THE SYSTEM
REACHING NORTH INTO CENTRAL OHIO WITH THE CLOUDS EXTENDING FURTHER
NORTH INTO NRN OHIO. THE NAM IS FURTHEST NORTH WITH THE PRECIP
ACCUMULATING A COUPLE INCHES OF SNOW ACROSS THE SOUTH/SOUTHEAST ON
SUNDAY WITH ANOTHER INCH SUNDAY EVENING. THE GFS KEEPS IT ALL
SOUTH. FOR NOW WILL BRING A CHANCE POP INTO THE SOUTH/SOUTHEAST
SUNDAY AFTERNOON AND CONTINUE INTO SUNDAY NIGHT. COULD SEE A
LITTLE LEFTOVER MONDAY FAR SOUTHEAST BUT FOR THE MOST PART WILL BE
A DRY DAY. TEMPS BELOW TO MUCH BELOW NORMAL THROUGH THE SHORT TERM.
&&
.LONG TERM /TUESDAY THROUGH FRIDAY/...
MODELS CONTINUE TO STRUGGLE WITH THE TIMING OF SYSTEMS THROUGH A
FAST UPPER LEVEL ATTEMPT AT ZONAL FLOW. EACH SYSTEM WILL NOT BE ABLE
TO PICK UP ALL THAT MUCH MOISTURE AS THEY PASS BUT WILL BE ENOUGH OF
A NUISANCE THAT WE WILL NEED TO MENTION SOME LIGHT RAIN/SNOW THROUGH
THE EXTENDED. RAIN MAINLY DURING THE DAY WITH SOME LIGHT SNOW
POSSIBLE AT NIGHT. THE BETTER CHANCES AT THIS TIME APPEAR TO BE
TUESDAY NIGHT INTO WEDNESDAY AND AGAIN ON THURSDAY.
HIGHS THROUGH THE EXTENDED LOOK TO BE 3 TO 5 DEGREES EITHER SIDE OF
A SEASONAL AVERAGE IN THE LOWER TO MIDDLE 40S.
&&
.AVIATION /18Z FRIDAY THROUGH WEDNESDAY/...
CEILINGS WILL SLOWLY LOWER INTO THE EVENING AS A COLD FRONT
APPROACHES. THE FRONT WILL MOVE ACROSS THE REGION FROM WEST TO
EAST THROUGH 09Z WITH SOME LIGHT PRECIPITATION POSSIBLE AHEAD OF
AND JUST IN ITS WAKE. IT APPEARS IT WILL BE LIQUID THROUGH AROUND
05Z THEN TRANSITION OVER TO SOME LIGHT SNOW. THE LIGHT SNOW COULD
BE ENHANCED ACROSS NE OH AND NW PA WITH FLOW OFF OF LAKE ERIE. FOR
NOW WILL ONLY MENTION MVFR CONDITIONS IN THE SNOW ACROSS THE
EASTERN PORTION OF THE COUNTY WARNING AREA...GENERALLY EAST OF
KCGF TO KCAK LINE. ANY PATCHES OF MVFR ACROSS THE EAST SHOULD LIFT
BY LATE SATURDAY MORNING.
OTHERWISE GUSTY SOUTHWEST WINDS WILL CONTINUE INTO THE EVENING.
THE THICKER HIGH LEVEL CLOUD COVER OVER THE REGION HAS BEEN
ENOUGH TO HELP LIMIT MIXING. EXPECT THIS TREND TO CONTINUE WITH
GUSTS REMAINING UNDER 30 KNOTS AT MOST LOCATIONS. THERE IS A SLIM
CHANCE THAT LOCATIONS NEAR THE LAKESHORE COULD GUST TO 35 KNOTS.
WINDS WILL DECREASE SLIGHTLY IN THE WAKE OF THE FRONT BUT WILL
BECOME WESTERLY. GUSTS SHOULD INCREASE AGAIN ON SATURDAY BUT
SHOULD BE UNDER 25 KNOTS.
.OUTLOOK...NON VFR POSSIBLE SUNDAY...MAINLY SOUTH IN LIGHT SNOW.
&&
.MARINE...
SOUTHWEST WINDS WILL BE GUSTY ON THE LAKE UNTIL A FRONTAL BOUNDARY
PASSES ACROSS LAKE ERIE TONIGHT. THE FRONT SHOULD CLEAR THE EAST END
OF THE LAKE BETWEEN 06Z AND 09Z. SINCE WE ARE IN A WARM ADVECTION
PATTERN IT IS TYPICALLY DIFFICULT TO GET THE STRONGEST WINDS DOWN TO
THE LAKE SURFACE. HOWEVER WE STILL COULD SEE A FEW GUSTS IN EXCESS
OF 35 KNOTS BUT DO NOT THINK IT WILL BE PERSISTENT ENOUGH TO NEED A
GALE. HIGH PRESSURE WILL RIDGE ONTO THE LAKE FROM THE NORTH SATURDAY
NIGHT AS A STORM SYSTEM MOVES SOUTH OF THE OHIO RIVER VALLEY THROUGH
SUNDAY. EAST TO NORTHEAST WINDS WILL INCREASE AS THE LOW PASSES BUT
IT DOES NOT APPEAR THAT WINDS ON THE LAKE WILL EXCEED 30 KNOTS. WE
WILL THEN MONITOR THE MOVEMENT OF LOW PRESSURE ACROSS THE CENTRAL
LAKES TUESDAY NIGHT INTO WEDNESDAY NIGHT. WINDS WILL INCREASE FROM
THE SOUTHWEST IN ADVANCE OF THE LOW. GUSTY NORTHWEST WINDS WILL ALSO
BE POSSIBLE IN ITS WAKE.
&&
.CLE WATCHES/WARNINGS/ADVISORIES...
OH...NONE.
PA...NONE.
MARINE...NONE.
&&
$$
SYNOPSIS...TK
NEAR TERM...TK
SHORT TERM...TK
LONG TERM...MULLEN
AVIATION...MULLEN
MARINE...MULLEN
AREA FORECAST DISCUSSION
NWS CHARLESTON WV
330 PM EDT FRI MAR 14 2014
.SYNOPSIS...
WEAK COLD FRONT CROSSES TONIGHT. DRY SATURDAY. LOW PRESSURE MOVES
ACROSS TENNESSEE VALLEY LATE SUNDAY BRINGING MIXED PRECIPITATION SUNDAY
INTO MONDAY. DRIER TUESDAY. ANOTHER COLD FRONT CROSSES BY MID WEEK.
&&
.NEAR TERM /THROUGH SATURDAY/...
TOP OF MIXING LAYER TOPS OUT AROUND 5000 MSL THIS AFTERNOON. THE
STRONGER FORECAST GUSTS OF 30 TO 35 KNOTS IN THE OHIO VALLEY SHOULD
DIMINISH TOWARD SUNSET...BUT STILL EXPECTED THE WIND TO BLOW THIS
EVENING. 925 MB FLOW ON RAP STILL AROUND 40 KNOTS THIS EVENING.
INCREASED SPEED A BIT IN THE OHIO VALLEY FOR THIS EVENING. SPECIAL
WEATHER STATEMENT FOR ENHANCED FIRE THREAT CONTINUES TIL 23Z.
WAS ABOUT AN HOUR OR TWO FASTER PUSHING THE PREFRONTAL LIGHT SHOWER
ACROSS CWA OVERNIGHT. OVERALL LOWERED POPS ABOUT 10 TO 20 PERCENT
WITH THAT BAND. ONLY ORGANIZATION NEAR 18Z WAS ACTUALLY BETWEEN PAH
AND MEM NOT FURTHER NORTH. STILL THINK A FEW HUNDREDTHS COULD OCCUR
OVERNIGHT.
HAVE CLEARING FAIRLY RAPIDLY DURING PREDAWN HOURS IN THE WESTERN
LOWLANDS...WITH SOME STRATOCUMULUS STILL HOLDING OVER MOUNTAINS
AROUND 12Z BEFORE EVAPORATING.
NO MAJOR CHANGES IN OUR MINIMUM AND MAXIMUM TEMPERATURES FOR TONIGHT
AND SATURDAY.
&&
.SHORT TERM /SATURDAY NIGHT THROUGH MONDAY/...
ACTIVE WEATHER...AS USUAL...IN THE SHORT TERM PERIOD. HIGH PRESSURE
WILL BE OVERTAKEN BY A LOW PRESSURE SYSTEM THAT WILL MOVE OUT OF THE
SOUTH CENTRAL U.S. TOWARDS THE REGION. STILL CONTINUES TO BE SOME
MODEL DIFFERENCES CONCERNING THIS STORM...BUT MODELS ARE STARTING
TO COME INTO BETTER AGREEMENT...TRENDING COLDER. NAM CONTINUES TO BE
THE WARMER SOLUN...AND BRINGS A CLOSED UPPER LOW ACROSS THE DEEP
SOUTH...AND A STRONGER SOUTHERLY FLOW ALOFT. GFS AND ECMWF ARE MORE
IN AGREEMENT...AND ARE COLDER SOLUNS...AND THE ECMWF AS THE
PREFERRED SOLUN FOR THIS SYSTEM ACCORDING TO WPC...WAS USED TO
CONFIGURE PRECIPITATION TYPES.
NOT ESPECIALLY IMPRESSIVE MOISTURE ASSOCIATED WITH THE SYSTEM...PW
VALUES GENERALLY RISING TO AROUND 0.6 TO 0.8 INCHES...BUT GOOD
DYNAMICS MID LEVELS AND ALOFT...ALONG WITH GOOD DENDRITE GROWTH WILL
ALLOW FOR ACCUMULATING SNOWS...PARTICULARLY ACROSS THE NORTH WHERE
COLDER AIR WILL EXIST. WITH USING THE COLDER SOLUN...THIS HAS WIPED
OUT MOST OF THE MIXED PRECIPITATION...I.E. SLEET AND FREEZING RAIN
ACROSS THE CWA. THE LOW WILL PUSH OFF TO THE EAST SUNDAY
NIGHT...ALLOWING FOR COLDER AIR TO FILTER INTO THE REGION...AND FOR
PRECIPITATION TO GRADUALLY CHANGE TO SNOW OR AT LEAST A MIX...PRETTY
MUCH CWA WIDE.
AT THIS POINT...AM HOLDING OFF ON A WATCH FOR 1 MORE
PERIOD...ALLOWING THE MIDNIGHT SHIFT TO TAKE ANOTHER LOOK AT
THINGS...PARTICULARLY WITH THE MODEL VARIABILITY. BUT IT IS LOOKING
LIKE SEVERAL INCHES OF SNOWFALL ACCUMULATIONS POSSIBLE ACROSS
NORTHERN ZONES INCLUDING SOUTHEAST OHIO...NORTHERN WV...AND THE
NORTHERN MOUNTAIN ZONES. AT THIS POINT...GENERALLY HAVE 2 TO 5
INCHES FORECAST ACROSS PARTS OF SOUTHEAST OHIO AND NORTHERN WV
ZONES...WITH 4 TO 6 ACROSS NORTHERN MOUNTAIN ZONES...WITH HIGHER
AMOUNTS POSSIBLE ACROSS HIGHER TERRAIN. ACROSS THE CRW-HTS METRO
AREA AND SOUTH...GENERALLY AROUND AN INCH OR SO. HAVE HIGHLIGHTED
SOUTHEAST OHIO...NORTHERN WV...AND NORTHERN MOUNTAIN ZONES IN THE
HWO FOR POTENTIAL HEADLINES.
&&
.LONG TERM /MONDAY NIGHT THROUGH FRIDAY/...
WITH A COLD FRONT PROBABLY TO OUR EAST AND SOUTH...A CANADIAN HIGH
PRESSURE BUILDS ACROSS THE GREAT LAKES REGION INTO THE NORTHERN
PORTIONS OF WV LATE MONDAY. THIS FEATURE WILL PROVIDE DRY WEATHER
THROUGH TUESDAY.
A SURFACE LOW PRESSURE SYSTEM DEVELOPS OVER THE CENTRAL
PLAINS...STRENGTHENING AS IT TRACK EAST NORTHEAST INTO THE GREAT
LAKES REGION BY WEDNESDAY. THE LOCAL AREA SHOULD REMAIN IN THE WARM
SECTOR...WITH WARM FRONT LIFTING NORTH ON WEDNESDAY...FOLLOWED BY A
COLD FRONT WEDNESDAY NIGHT...EXITING EARLY THURSDAY.
THE LATEST ECMWF IS CONSISTENT WITH ITS PREVIOUS RUN...BRINGING A
COLD FRONT LATE WEDNESDAY NIGHT...DECAYING EARLY THURSDAY. THE GFS
IS ABOUT 18 HOURS FASTER WITH THIS FEATURE. THERE ARE LARGE
DIFFERENCES IN ECMWF ENSEMBLES TEMPERATURES. ALTHOUGH SOME SPREAD IS
NOTICED ON THE GFS ENSEMBLES WITH THE UPPER TROUGH...SOME CONSENSUS
IN NOTICED AMONG ITS MEMBERS. PREFERRED THE SLOWER SOLUTION AND WENT
WITH THE ECMWF WITH THE TIMING OF THE COLD FRONT.
THEREFORE...INCREASE CHANCE POPS ON WEDNESDAY...WITH HIGHER POPS
WEDNESDAY NIGHT.
GENERALLY USED HPC GUIDANCE. TEMPS SHOULD GRADUALLY WARM
AT OR ABOVE SEASONAL LEVELS BY MID WEEK. TWEAKED DOWN TEMPS FRIDAY
DAY 7 TO COMPROMISE WITH NEIGHBORING OFFICES.
&&
.AVIATION /20Z FRIDAY THROUGH WEDNESDAY/...
STRONG LOW LEVEL FLOW CONTINUES INTO TONIGHT...BUT GRADUALLY
WEAKENING 06Z TO 12Z. FRONT PASSING CKB-CRW LINE BY 09Z. HAVE A FEW
LIGHT SHOWERS POSSIBLE ALONG IT FOR A HOUR OR TWO...WITH SOME
CEILINGS 2 TO 4 THSD FT BKN AND VSBY ONLY DROPPING TO NEAR 5 OR 6
MILES OVER THE CENTRAL WV MOUNTAIN COUNTIES.
LEFTOVER STRATOCUMULUS AT 2 TO 4 THSD FT AT 12Z OVER MOUNTAIN
COUNTIES SHOULD EVAPORATE BY 15Z...WITH CEILING UNLIMITED AND VSBY
UNRESTRICTED AFTERWORDS.
FORECAST CONFIDENCE AND ALTERNATE SCENARIOS THROUGH 18Z SATURDAY...
ALTERNATE SCENARIOS: NONE.
EXPERIMENTAL TABLE OF FLIGHT CATEGORY OBJECTIVELY SHOWS CONSISTENCY
OF WFO FORECAST TO AVAILABLE MODEL INFORMATION:
H = HIGH: TAF CONSISTENT WITH ALL MODELS OR ALL BUT ONE MODEL.
M = MEDIUM: TAF HAS VARYING LEVEL OF CONSISTENCY WITH MODELS.
L = LOW: TAF INCONSISTENT WITH ALL MODELS OR ALL BUT ONE MODEL.
UTC 1HRLY 20 21 22 23 00 01 02 03 04 05 06 07
EDT 1HRLY 16 17 18 19 20 21 22 23 00 01 02 03
CRW CONSISTENCY H H H H H H H H H H H H
HTS CONSISTENCY H H H H H H H H H H H H
BKW CONSISTENCY H H H H H H H H H H H H
EKN CONSISTENCY H H H H H H H H H H H H
PKB CONSISTENCY H H H H H H H H H H H H
CKB CONSISTENCY H H H H H H H H H H H H
AFTER 18Z SATURDAY...
IFR POSSIBLE IN RAIN...WET SNOW...SLEET AND LOW CEILINGS SUNDAY
AFTERNOON INTO MONDAY.
&&
.RLX WATCHES/WARNINGS/ADVISORIES...
WV...NONE.
OH...NONE.
KY...NONE.
VA...NONE.
&&
$$
SYNOPSIS...KTB/ARJ/SL
NEAR TERM...KTB
SHORT TERM...SL
LONG TERM...99
AVIATION...ARJ
AREA FORECAST DISCUSSION
NWS CHARLESTON WV
321 PM EDT FRI MAR 14 2014
.SYNOPSIS...
A WEAK COLD FRONT WILL CROSS TONIGHT. DRY SATURDAY. A LOW PRESSURE
MOVING INTO TENNESSEE VALLEY SUNDAY AFTERNOON WILL BRING RAIN...
SLEET...AND SNOW SUNDAY INTO MONDAY. DRIER TUESDAY.
&&
.NEAR TERM /THROUGH SATURDAY/...
TOP OF MIXING LAYER TOPS OUT AROUND 5000 MSL THIS AFTERNOON. THE
STRONGER FORECAST GUSTS OF 30 TO 35 KNOTS IN THE OHIO VALLEY SHOULD
DIMINISH TOWARD SUNSET...BUT STILL EXPECTED THE WIND TO BLOW THIS
EVENING. 925 MB FLOW ON RAP STILL AROUND 40 KNOTS THIS EVENING.
INCREASED SPEED A BIT IN THE OHIO VALLEY FOR THIS EVENING. SPECIAL
WEATHER STATEMENT FOR ENHANCED FIRE THREAT CONTINUES TIL 23Z.
WAS ABOUT AN HOUR OR TWO FASTER PUSHING THE PREFRONTAL LIGHT SHOWER
ACROSS CWA OVERNIGHT. OVERALL LOWERED POPS ABOUT 10 TO 20 PERCENT
WITH THAT BAND. ONLY ORGANIZATION NEAR 18Z WAS ACTUALLY BETWEEN PAH
AND MEM NOT FURTHER NORTH. STILL THINK A FEW HUNDREDTHS COULD OCCUR
OVERNIGHT.
HAVE CLEARING FAIRLY RAPIDLY DURING PREDAWN HOURS IN THE WESTERN
LOWLANDS...WITH SOME STRATOCUMULUS STILL HOLDING OVER MOUNTAINS
AROUND 12Z BEFORE EVAPORATING.
NO MAJOR CHANGES IN OUR MINIMUM AND MAXIMUM TEMPERATURES FOR TONIGHT
AND SATURDAY.
&&
.SHORT TERM /SATURDAY NIGHT THROUGH MONDAY/...
ACTIVE WEATHER...AS USUAL...IN THE SHORT TERM PERIOD. HIGH PRESSURE
WILL BE OVERTAKEN BY A LOW PRESSURE SYSTEM THAT WILL MOVE OUT OF THE
SOUTH CENTRAL U.S. TOWARDS THE REGION. STILL CONTINUES TO BE SOME
MODEL DIFFERENCES CONCERNING THIS STORM...BUT MODELS ARE STARTING
TO COME INTO BETTER AGREEMENT...TRENDING COLDER. NAM CONTINUES TO BE
THE WARMER SOLUN...AND BRINGS A CLOSED UPPER LOW ACROSS THE DEEP
SOUTH...AND A STRONGER SOUTHERLY FLOW ALOFT. GFS AND ECMWF ARE MORE
IN AGREEMENT...AND ARE COLDER SOLUNS...AND THE ECMWF AS THE
PREFERRED SOLUN FOR THIS SYSTEM ACCORDING TO WPC...WAS USED TO
CONFIGURE PRECIPITATION TYPES.
NOT ESPECIALLY IMPRESSIVE MOISTURE ASSOCIATED WITH THE SYSTEM...PW
VALUES GENERALLY RISING TO AROUND 0.6 TO 0.8 INCHES...BUT GOOD
DYNAMICS MID LEVELS AND ALOFT...ALONG WITH GOOD DENDRITE GROWTH WILL
ALLOW FOR ACCUMULATING SNOWS...PARTICULARLY ACROSS THE NORTH WHERE
COLDER AIR WILL EXIST. WITH USING THE COLDER SOLUN...THIS HAS WIPED
OUT MOST OF THE MIXED PRECIPITATION...I.E. SLEET AND FREEZING RAIN
ACROSS THE CWA. THE LOW WILL PUSH OFF TO THE EAST SUNDAY
NIGHT...ALLOWING FOR COLDER AIR TO FILTER INTO THE REGION...AND FOR
PRECIPITATION TO GRADUALLY CHANGE TO SNOW OR AT LEAST A MIX...PRETTY
MUCH CWA WIDE.
AT THIS POINT...AM HOLDING OFF ON A WATCH FOR 1 MORE
PERIOD...ALLOWING THE MIDNIGHT SHIFT TO TAKE ANOTHER LOOK AT
THINGS...PARTICULARLY WITH THE MODEL VARIABILITY. BUT IT IS LOOKING
LIKE SEVERAL INCHES OF SNOWFALL ACCUMULATIONS POSSIBLE ACROSS
NORTHERN ZONES INCLUDING SOUTHEAST OHIO...NORTHERN WV...AND THE
NORTHERN MOUNTAIN ZONES. AT THIS POINT...GENERALLY HAVE 2 TO 5
INCHES FORECAST ACROSS PARTS OF SOUTHEAST OHIO AND NORTHERN WV
ZONES...WITH 4 TO 6 ACROSS NORTHERN MOUNTAIN ZONES...WITH HIGHER
AMOUNTS POSSIBLE ACROSS HIGHER TERRAIN. ACROSS THE CRW-HTS METRO
AREA AND SOUTH...GENERALLY AROUND AN INCH OR SO. HAVE HIGHLIGHTED
SOUTHEAST OHIO...NORTHERN WV...AND NORTHERN MOUNTAIN ZONES IN THE
HWO FOR POTENTIAL HEADLINES.
&&
.LONG TERM /MONDAY NIGHT THROUGH FRIDAY/...
RAIN SHOULD MIX WITH OR CHANGE OVER TO SNOW SUN NGT INTO EASTERLY MON
BEFORE LOW PRES EXITS THE E COAST. GENERALLY ZONAL FLOW SHOULD SET UP
FOR MUCH OF THE REST OF THE PERIOD...WITH ANOTHER TROF APPROACHING
THU. TEMPS SHOULD GRADUALLY WARM AT OR ABOVE SEASONAL LEVELS BY MID
WEEK.
&&
.AVIATION /19Z FRIDAY THROUGH WEDNESDAY/...
STRONG LOW LEVEL FLOW CONTINUES INTO TONIGHT...BUT GRADUALLY
WEAKENING 06Z TO 12Z. FRONT PASSING CKB-CRW LINE BY 09Z. HAVE A FEW
LIGHT SHOWERS POSSIBLE ALONG IT FOR A HOUR OR TWO...WITH SOME
CEILINGS 2 TO 4 THSD FT BKN AND VSBY ONLY DROPPING TO NEAR 5 OR 6
MILES OVER THE CENTRAL WV MOUNTAIN COUNTIES.
LEFTOVER STRATOCUMULUS AT 2 TO 4 THSD FT AT 12Z OVER MOUNTAIN
COUNTIES SHOULD EVAPORATE BY 15Z...WITH CEILING UNLIMITED AND VSBY
UNRESTRICTED AFTERWORDS.
FORECAST CONFIDENCE AND ALTERNATE SCENARIOS THROUGH 18Z SATURDAY...
ALTERNATE SCENARIOS: NONE.
EXPERIMENTAL TABLE OF FLIGHT CATEGORY OBJECTIVELY SHOWS CONSISTENCY
OF WFO FORECAST TO AVAILABLE MODEL INFORMATION:
H = HIGH: TAF CONSISTENT WITH ALL MODELS OR ALL BUT ONE MODEL.
M = MEDIUM: TAF HAS VARYING LEVEL OF CONSISTENCY WITH MODELS.
L = LOW: TAF INCONSISTENT WITH ALL MODELS OR ALL BUT ONE MODEL.
UTC 1HRLY 20 21 22 23 00 01 02 03 04 05 06 07
EDT 1HRLY 16 17 18 19 20 21 22 23 00 01 02 03
CRW CONSISTENCY H H H H H H H H H H H H
HTS CONSISTENCY H H H H H H H H H H H H
BKW CONSISTENCY H H H H H H H H H H H H
EKN CONSISTENCY H H H H H H H H H H H H
PKB CONSISTENCY H H H H H H H H H H H H
CKB CONSISTENCY H H H H H H H H H H H H
AFTER 18Z SATURDAY...
IFR POSSIBLE IN RAIN...WET SNOW...SLEET AND LOW CEILINGS SUNDAY
AFTERNOON INTO MONDAY.
&&
.RLX WATCHES/WARNINGS/ADVISORIES...
WV...NONE.
OH...NONE.
KY...NONE.
VA...NONE.
&&
$$
SYNOPSIS...KTB/ARJ/SL
NEAR TERM...KTB
SHORT TERM...SL
LONG TERM...99
AVIATION...KTB
AREA FORECAST DISCUSSION
NWS CHARLESTON WV
210 PM EDT FRI MAR 14 2014
.SYNOPSIS...
A WEAK COLD FRONT WILL CROSS TONIGHT. DRY SATURDAY. A LOW PRESSURE
MOVING INTO TENNESSEE VALLEY SUNDAY AFTERNOON WILL BRING RAIN...
SLEET...AND SNOW SUNDAY INTO MONDAY. DRIER TUESDAY.
&&
.NEAR TERM /THROUGH SATURDAY/...
TOP OF MIXING LAYER TOPS OUT AROUND 5000 MSL THIS AFTERNOON. THE
STRONGER FORECAST GUSTS OF 30 TO 35 KNOTS IN THE OHIO VALLEY SHOULD
DIMINISH TOWARD SUNSET...BUT STILL EXPECTED THE WIND TO BLOW THIS
EVENING. 925 MB FLOW ON RAP STILL AROUND 40 KNOTS THIS EVENING.
INCREASED SPEED A BIT IN THE OHIO VALLEY FOR THIS EVENING. SPECIAL
WEATHER STATEMENT FOR ENHANCED FIRE THREAT CONTINUES TIL 23Z.
WAS ABOUT AN HOUR OR TWO FASTER PUSHING THE PREFRONTAL LIGHT SHOWER
ACROSS CWA OVERNIGHT. OVERALL LOWERED POPS ABOUT 10 TO 20 PERCENT
WITH THAT BAND. ONLY ORGANIZATION NEAR 18Z WAS ACTUALLY BETWEEN PAH
AND MEM NOT FURTHER NORTH. STILL THINK A FEW HUNDREDTHS COULD OCCUR
OVERNIGHT.
HAVE CLEARING FAIRLY RAPIDLY DURING PREDAWN HOURS IN THE WESTERN
LOWLANDS...WITH SOME STRATOCUMULUS STILL HOLDING OVER MOUNTAINS
AROUND 12Z BEFORE EVAPORATING.
NO MAJOR CHANGES IN OUR MINIMUM AND MAXIMUM TEMPERATURES FOR TONIGHT
AND SATURDAY.
&&
.SHORT TERM /SATURDAY NIGHT THROUGH MONDAY/...
MODELS ARE IN FAIRLY GOOD AGREEMENT WITH THE OVERALL PATTERN
ASSOCIATED WITH THE SYSTEM ON SUNDAY THROUGH MONDAY. SOME
DIFFERENCES IN THE THERMAL PROFILE OVER OUR REGION...WHICH COULD
MAKE A BIG DIFFERENCE IN THE TYPE OF PRECIPITATION FOR THE AREA.
FOR NOW...WILL RUN WITH A MODEL BLEND WHICH WOULD CREATE A FAIRLY
TYPICAL SCENARIO FOR THE REGION...WITH RAIN IN THE SOUTH...AND MIXED
PRECIPITATION IN THE NORTH AND WEST.
&&
.LONG TERM /MONDAY NIGHT THROUGH THURSDAY/...
RAIN SHOULD MIX WITH OR CHANGE OVER TO SNOW SUN NGT INTO EASTERLY MON
BEFORE LOW PRES EXITS THE E COAST. GENERALLY ZONAL FLOW SHOULD SET UP
FOR MUCH OF THE REST OF THE PERIOD...WITH ANOTHER TROF APPROACHING
THU. TEMPS SHOULD GRADUALLY WARM AT OR ABOVE SEASONAL LEVELS BY MID
WEEK.
&&
.AVIATION /18Z FRIDAY THROUGH WEDNESDAY/...
STRONG LOW LEVEL FLOW CONTINUES INTO TONIGHT...BUT GRADUALLY
WEAKENING 06Z TO 12Z. FRONT PASSING CKB-CRW LINE BY 09Z. HAVE A FEW
LIGHT SHOWERS POSSIBLE ALONG IT FOR A HOUR OR TWO...WITH SOME
CEILINGS 2 TO 4 THSD FT BKN AND VSBY ONLY DROPPING TO NEAR 5 OR 6
MILES OVER THE CENTRAL WV MOUNTAIN COUNTIES.
LEFTOVER STRATOCUMULUS AT 2 TO 4 THSD FT AT 12Z OVER MOUNTAIN
COUNTIES SHOULD EVAPORATE BY 15Z...WITH CEILING UNLIMITED AND VSBY
UNRESTRICTED AFTERWORDS.
FORECAST CONFIDENCE AND ALTERNATE SCENARIOS THROUGH 18Z SATURDAY...
ALTERNATE SCENARIOS: NONE.
EXPERIMENTAL TABLE OF FLIGHT CATEGORY OBJECTIVELY SHOWS CONSISTENCY
OF WFO FORECAST TO AVAILABLE MODEL INFORMATION:
H = HIGH: TAF CONSISTENT WITH ALL MODELS OR ALL BUT ONE MODEL.
M = MEDIUM: TAF HAS VARYING LEVEL OF CONSISTENCY WITH MODELS.
L = LOW: TAF INCONSISTENT WITH ALL MODELS OR ALL BUT ONE MODEL.
UTC 1HRLY 18 19 20 21 22 23 00 01 02 03 04 05
EDT 1HRLY 14 15 16 17 18 19 20 21 22 23 00 01
CRW CONSISTENCY H H H H H H H H H H H H
HTS CONSISTENCY H H H H H H H H H H H H
BKW CONSISTENCY H H H H H H H H H H H H
EKN CONSISTENCY H H H H H H H H H H H H
PKB CONSISTENCY H H H H H H H H H H H H
CKB CONSISTENCY H H H H H H H H H H H H
AFTER 18Z SATURDAY...
IFR POSSIBLE IN RAIN...WET SNOW...SLEET AND LOW CEILINGS SUNDAY
AFTERNOON INTO MONDAY.
&&
.RLX WATCHES/WARNINGS/ADVISORIES...
WV...NONE.
OH...NONE.
KY...NONE.
VA...NONE.
&&
$$
SYNOPSIS...KTB/ARJ/SL
NEAR TERM...KTB
SHORT TERM...RPY
LONG TERM...99
AVIATION...KTB
YOU CAN SEE AN ILLUSTRATED VERSION OF THE FORECAST DISCUSSION AT
WWW.WEATHER.GOV/SEATTLE/GAFD/LATEST_WEBAFD.HTML
AREA FORECAST DISCUSSION
NWS SPOKANE WA
1131 AM PDT Fri Mar 14 2014
.SYNOPSIS...
A weather system will track across the inland Northwest today and
result in rain...mountain snow...breezy winds and the possibility
of isolated thunderstorms. High pressure and drier weather returns
tonight but is short lives as another weather disturbance pushes a
threat of precipitation into the Cascades late Saturday into
Sunday, then across the remainder of the Inland Northwest later
Sunday afternoon into Monday. Drier weather returns Tuesday
through Thursday, but another threat of showers will be possible late
in the week. Temperatures will remain above seasonal norms.
&&
.DISCUSSION...
.Rest of Today...Band of stratiform precipitation associated
occluded front continues to track steadily eastward through the
region. As of 11am...the back edge stretched from Metaline Falls
to Post Falls and southwest toward Walla Walla. Precipitation will
continue ahead of this front for several more hours over the Idaho
Panhandle and then will exit the region. That`s not the end of the
precipitation though as the upper level trough and pool of cold
air aloft shifts into the heart of the Inland NW. Right now the
trough was just crossing the Cascade Crest...bringing a narrow
band of showers to the lee valleys of the Cascades. This narrow
band will likely be it for locations such as Wenatchee...
Waterville...and possibly Moses Lake and Omak. There was also a
well-defined Puget Sound Convergence Zone which looks like it
could impact the Stevens Pass region for a while this afternoon.
Once the upper level trough shifts into the eastern third of
Washington and the Idaho Panhandle later this afternoon...we will
likely see a rapid blossoming of showers. Thunder still looks like
a distinct possibility as the HRRR model has consistently shown
some small convective cells developing over the eastern Columbia
Basin...Palouse...Spokane area and into the Idaho Panhandle. We
have already seen one strike west of the Cascades...so this make
the thunder threat seem more plausible. Any storms which form will
likely produce gusty winds to 40-45 mph and possibly some small
hail. The threat will rapidly wane as the upper level trough moves
east of our forecast area early this evening. Precipitation
amounts could be moderate to locally heavy over the Idaho
Panhandle and some snow will be possible over the higher passes
including Lookout Pass.
Even without thunderstorms we expect to see increasing winds
associated with the passing front. Gusts of 30-40 mph are expected
across much of eastern Washington and extreme western portions of
the Idaho Panhandle. The speeds should persist through early
evening. fx
&&
.AVIATION...
18Z TAFS: Eastward moving front will provide ocnl rain and
MVFR/IFR cigs through 21z or so for GEG SFF COE PUW with slightly
better conditions at LWS. Once this front exits conditions should
improve steadily...however an unstable air mass coupled with an
upper level shortwave will likely trigger numerous showers and
possibly a thunderstorm. Brief MVFR cigs could be experienced at
any of the above mentioned airports as well as gusty winds
approaching 40kts if a thunderstorm happens to hit. Conditions
should improve rapidly after 02z as the shortwave exits. VFR
conditions should persist through the remainder of the period. A
weak disturbance late in the forecast period will bring another
round of lowering cigs. For MWH and EAT...the only weather
expected should occur between now and 21z as the shortwave moves
through. Brief showers are possible at both sites...with clearing
skies thereafter and gusty west winds. fx
&&
.PRELIMINARY POINT TEMPS/POPS...
Spokane 52 32 51 37 56 38 / 100 20 10 0 30 60
Coeur d`Alene 49 31 50 36 54 38 / 100 50 10 10 30 60
Pullman 51 34 53 39 58 39 / 90 30 0 0 10 60
Lewiston 57 37 60 41 64 43 / 70 20 0 0 10 60
Colville 52 30 54 34 56 34 / 100 20 20 20 50 60
Sandpoint 44 30 48 34 50 35 / 100 60 10 20 50 60
Kellogg 42 31 48 35 51 37 / 100 70 10 10 40 60
Moses Lake 61 34 58 39 63 39 / 60 10 10 10 10 40
Wenatchee 57 34 56 37 59 35 / 50 10 10 20 20 40
Omak 55 31 54 33 57 32 / 50 10 20 20 40 50
&&
.OTX WATCHES/WARNINGS/ADVISORIES...
ID...None.
WA...None.
&&
$$
FORECAST DISCUSSION FOR ROUTINE AFTERNOON FORECAST ISSUANCE
.SHORT TERM...TONIGHT AND SATURDAY
ISSUED AT 226 PM CDT FRI MAR 14 2014
LATEST RUC ANALYSIS AND SATELLITE/RADAR IMAGERY SHOW A COMPACT
SHORTWAVE MOVING TO THE EAST OVER NORTHEAST WISCONSIN EARLY THIS
AFTERNOON. PRECIP REPORTS ACROSS THE REGION HAVE BEEN FAR AND FEW
BETWEEN SO FAR TODAY...WITH ONLY SOME SITES IN VILAS COUNTY AND MTW
REPORTING ANY PRECIP. SUSPECT SOME PRECIP REACHED THE GROUND OVER
FAR NE WISCONSIN TOO BASED ON RADAR RETURNS. 12Z SOUNDINGS THIS MORNING
SHOWED A DRY WEDGE BELOW 700MB...AND SUSPECT THIS DRY AIR IS
PREVENTING MID-LEVEL RETURNS FROM REACHING THE GROUND AT MOST
LOCATIONS. NOT MANY REPORTS OF SNOW UPSTREAM EITHER...ONLY A FEW
OVER NORTHERN MINNESOTA. SLIGHT COLD ADVECTION IS OCCURRING BEHIND
A COOL FRONT...WHICH IS MOVING ACROSS LAKE MICHIGAN. THE COMBO OF
CLOUDS AND COLDER AIR HAS HALTED THE HEATING CURVE OVER
NORTH-CENTRAL WISCONSIN. MEANWHILE...AN ARCTIC COLD FRONT IS
DROPPING SOUTHEAST OVER NORTHEAST MINNESOTA. FORECAST CONCERNS
INCLUDE PRECIP CHANCES AND CLOUDS/TEMPS.
TONIGHT...BEHIND A COMPACT SHORTWAVE AND ASSOCIATED SURFACE LOW...AN
ARCTIC COLD FRONT WILL BE SHIFTING SOUTHEAST ACROSS THE FORECAST
AREA DURING THE EVENING. MID-LEVEL MOISTURE AND UPPER FORCING WILL
HAVE DEPARTED BY THIS TIME...BUT FLOW WILL BE TURNING TO THE NNW OFF
LAKE SUPERIOR AND A SURFACE TROUGH WILL BE HANGING BACK OVER FAR
NORTHERN WISCONSIN. WILL HAVE TO KEEP A CHANCE OF SNOW SHOWERS
ACROSS THE NORTH BECAUSE OF THIS...BUT LACK OF PRECIP ON UPSTREAM
OBS SUPPORTS BACKING OFF ON PRECIP AMOUNTS AND POPS SOMEWHAT. WILL
ONLY SHOW A COUPLE TENTHS OF AN INCH OF ACCUMULATIONS OVER NORTHERN
VILAS COUNTY. FORECAST SOUNDINGS DRY OUT AFTER MIDNIGHT AND THINK
CLOUDS AND SNOW SHOWERS WILL RETREAT TO THE NORTH. MODELS APPEAR A
LITTLE TOO QUICK THOUGH SINCE COLD ADVECTION WILL BE ONGOING...SO
WILL NOT SHOW CLEARING SKIES OVER CENTRAL AND EAST-CENTRAL WISCONSIN
UNTIL LATE TONIGHT. WITH THE CLOUDS AND PERSISTENT NORTHWEST
WINDS...SIDED WITH THE WARMER GUIDANCE WHICH SHOWS TEMPS RANGING
FROM THE MID-TEENS NORTH TO MID 20S SOUTH.
SATURDAY...THE ARCTIC FRONT WILL STALL FROM THE NORTHERN PLAINS TO
THE SOUTHERN GREAT LAKES SATURDAY MORNING. DIGGING SHORTWAVE OVER
THE PLAINS AND RIGHT REAR QUAD OF THE JET WILL CREATE THE FORCING
FOR A BAND OF SNOW TO DEVELOP ALONG THE FRONT WHICH PUSHES INTO
SOUTHERN WISCONSIN DURING THE AFTERNOON. THE NAM IS THE ONLY MODEL
WHICH TRACKS THE BAND OF SNOW INTO CENTRAL WISCONSIN. THE REST OF
THE MODELS ARE FARTHER SOUTH OVER SOUTHERN WISCONSIN. WILL SIDE
WITH THE MAJORITY OF GUIDANCE. STILL PLENTY OF LOW LEVEL MOISTURE
LEFT OVER ON PROGGED SOUNDINGS...WHICH TURNS INTO A CU FIELD WITH
DAYTIME HEATING. SO THINKING ANY CLEARING EARLY SATURDAY MORNING
WILL PARTIALLY FILL BACK IN BY LATE IN THE MORNING OR EARLY IN THE
AFTERNOON. ADDITIONALLY...LOW LEVEL FLOW WILL BE TURNING TO THE
NORTHEAST OVER NORTHERN LAKE MICHIGAN...WHICH COULD GENERATE A FEW
FLURRIES OVER EAST-CENTRAL WISCONSIN. WILL HAVE A MENTION LATE IN
THE AFTERNOON. NO SIGNIFICANT CHANGES TO TEMPS.
.LONG TERM...SATURDAY NIGHT THROUGH FRIDAY
ISSUED AT 226 PM CDT FRI MAR 14 2014
CANADIAN HIGH PRESSURE WILL DOMINATE THE WEATHER PATTERN SATURDAY
NIGHT THROUGH SUNDAY NIGHT. THIS WILL BRING VERY COLD CONDITIONS
FOR MID MARCH WITH LOWS IN THE SINGLE DIGITS ABOVE AND BELOW
ZERO SATURDAY NIGHT...AND HIGHS MAINLY IN THE 20S ON SUNDAY.
THE HIGH WILL SLIDE EAST OF THE AREA SUNDAY NIGHT AS SYSTEM
APPROACHES FROM THE WEST AND 850MB WARM ADVECTION BEGINS IN EARNEST.
THE TUESDAY THROUGH WEDNESDAY HAS BECOME MORE COMPLICATED THIS MORNING
AS THE ECMWF IS MUCH SLOWER AND WARMER THAN THE GFS/CANADIAN. THE
CANADIAN MODEL IS THE COLDEST SOLUTION WHILE THE THE GFS IS IN THE
MIDDLE. SIGNIFICANT DIFFERENCES IN THE TRACK OF THE SYSTEM IS ALSO
NOTED. THE GFS ENSEMBLE MEMBERS DID SHOW A LARGE VARIABLE IN THE
POSSIBLE TRACK OF THE STORM. WOULD LIKE TO LEAN TOWARD THE ECMWF
MODEL FOR THIS PACKAGE DUE TO ITS BETTER PERFORMANCE IN THE LATER
PERIODS...BUT THIS MODEL IS CONSIDERABLY WARMER AND SLOW THAN
PREVIOUS RUN. WILL CONTINUE WITH PREVIOUS FORECAST PACKAGE SINCE
THERE ARE SEVERAL MORE DAYS UNTIL THE EVENT AND LATER MODELS CAN
CONVERGE ON A SIMILAR SOLUTION.
&&
.AVIATION...FOR 18Z TAF ISSUANCE
ISSUED AT 1207 PM CDT FRI MAR 14 2014
COLDER AIR WILL BE PUSHING SOUTHEAST BEHIND A DEPARTING
LOW PRESSURE PRESSURE SYSTEM. WITHIN THE COLDER
AIRMASS...WIDESPREAD MVFR CIGS RESIDE OVER MINNESOTA AND NORTHWEST
WISCONSIN. THEY WILL BE SPREADING ACROSS THE REGION THIS AFTERNOON
AND STICKING AROUND FOR MUCH OF THIS EVENING. SCT LIGHT RAIN AND
SNOW SHOWERS THIS AFTERNOON TURNING TO ALL SNOW THIS EVENING...WILL
ACCOMPANY THE CLOUDS OVER FAR NORTHERN WISCONSIN. NOT CONFIDENT
ENOUGH IN COVERAGE TO INCLUDE IN THE RHI TAF THOUGH. CLOUDS AND
PRECIP WILL RETREAT TO THE NORTHEAST LATE TONIGHT WHICH SHOULD TURN
CIGS TO VFR OVER CENTRAL AND EAST-CENTRAL WISCONSIN. THEN CLOUDS WILL
BUILD AGAIN WITH DAYTIME HEATING BY LATE IN THE MORNING.
&&
.GRB WATCHES/WARNINGS/ADVISORIES...
NONE.
&&
$$
SHORT TERM.....MPC
LONG TERM......ECKBERG
AVIATION.......MPC
AREA FORECAST DISCUSSION
NWS LA CROSSE WI
1217 PM CDT FRI MAR 14 2014
.SHORT TERM...(TODAY AND TONIGHT)
ISSUED AT 342 AM CDT FRI MAR 14 2014
THE MAIN FOCUS TODAY/TONIGHT IS ON THE PAIR OF COLD FRONTS THAT
WILL SWING THROUGH THE REGION.
SOUTHWESTERLY LOW LEVEL FLOW OVERNIGHT HAS KEPT TEMPERATURES UP
INTO THE LOW 40S THROUGH MUCH OF THE REGION WITH THE EXCEPTION OF
NORTH CENTRAL WISCONSIN WHERE WINDS WENT CALM AND RADIATIONAL
COOLING LET TEMPERATURES SLIP TOWARD THE FREEZING MARK. AT THE
SURFACE...A LOW JUST WEST OF LAKE SUPERIOR HAS A COLD FRONT THAT
DROPS SOUTH OUT OF IT THROUGH EASTERN MINNESOTA ON INTO WESTERN
IOWA. A SECONDARY COLD FRONT IS DRAPED TO THE NORTH OF THE LOW
AND RUNS EAST TO WEST ACROSS SOUTH CENTRAL CANADA. FURTHER
ALOFT...A MID LEVEL TROUGH EXTENDS FROM WESTERN ONTARIO INTO THE
NORTHERN PLAINS VIA 14.07Z RAP ANALYSIS/WATER VAPOR IMAGERY AND IS
PROVIDING SOME MID TO UPPER LEVEL CLOUD COVER AHEAD OF IT.
FOR TODAY...THERE HAVE BEEN SOME SIGNALS THAT SOME LIGHT RAIN
SHOWERS COULD DEVELOP THIS MORNING/AFTERNOON BEHIND THE FIRST COLD
FRONT PASSAGE AND AHEAD OF THE MID LEVEL TROUGH. LOOKING
UPSTREAM...THERE IS NOT MUCH IN THE WAY OF LOW/MID LEVEL CLOUD
COVER WITH THIS PASSING WAVE AND NOTHING ON REGIONAL RADARS. THE
14.07Z RAP DOES SHOW AN INCREASING TREND IN RH THROUGH THE DAY
THROUGH THE HRRR HAS TRENDED DRIER WITH ANY 1KM AGL REFLECTIVITY
RETURNS. CONSIDERED ADDING IN A SMALL CHANCE FOR A RAIN
SHOWER...BUT CONFIDENCE IN ANYTHING OCCURRING IS TOO LOW TO TOSS
IT IN THERE. TEMPERATURES WILL DROP THE MOST AS THE SECONDARY COLD
FRONT SWINGS THROUGH LATER THIS AFTERNOON AND EARLY EVENING WITH A
STRATUS DECK LIKELY ACCOMPANYING IT.
.LONG TERM...(SATURDAY THROUGH THURSDAY)
ISSUED AT 342 AM CDT FRI MAR 14 2014
THE MAIN FOCUS FOR THE EXTENDED PERIOD IS ON SNOW
CHANCES...PARTICULARLY FOR TUESDAY WHEN A POTENT STORM SYSTEM
COULD MOVE THROUGH THE REGION.
THE FIRST ROUND OF PRECIPITATION COMES IN MAINLY AS SNOW ALONG A
FRONTOGENETIC BAND THAT LOOKS LIKE IT FORMS SATURDAY MORNING AND
DRIFTS SOUTH INTO SATURDAY EVENING. HAVE UPPED THE PRECIPITATION
CHANCES FOR THIS PERIOD...PARTICULARLY IN NORTHEAST IOWA THOUGH
THE 14.00Z ECMWF SHOOTS SOUTH OF THE REGION AND WOULD KEEP THINGS
DRY FOR THE MOST PART. BECAUSE OF THIS...HAVE NOT GONE UP TO
LIKELIES YET. SOME QUESTIONS IN WHETHER A WARM LAYER WILL BE
PRESENT TO CHANGE THE PRECIPITATION OVER TO RAIN OR A MIX. THE
14.00Z NAM SOUNDINGS DO SHOW A WARM LAYER TO +3C AROUND 875MB
WHILE THE 14.00Z KEEP THE THERMAL PROFILE UNDER 0C. THIS COULD
KEEP SNOW TOTALS DOWN A BIT...PARTICULARLY IF THE NAM WARM LAYER
OCCURS. 14.03Z SREF PLUMES FOR SNOW ACCUMULATIONS ALSO ADD SOME
UNCERTAINTY WITH THE MEAN BEING AROUND 1-2 INCHES THOUGH A FEW
MEMBERS GO OFF THE CHARTS DUE TO THE FGEN FORCING. HAVE GONE THE
CONSERVATIVE ROUTE AND KEPT THE SNOW TOTALS TO 2 INCHES OR LESS
WITH THE HIGHEST AMOUNTS IN NORTHEAST IOWA.
THERE WILL BE ANOTHER SHOT FOR SOME LIGHT SNOW SUNDAY NIGHT INTO
MONDAY IN ASSOCIATION WITH LOW LEVEL WARM AIR ADVECTION OCCURRING
AHEAD A MORE POTENT SYSTEM THAT WILL BE DEVELOPING ACROSS THE
PLAINS ON TUESDAY. BOTH THE 14.00Z GFS AND ECMWF SHOW A CLOSING
OFF/NEGATIVELY TITLED MID LEVEL TROUGH FORMING ACROSS THE UPPER
MISSISSIPPI RIVER VALLEY WITH A DEEPENING SURFACE LOW PROPAGATING
FROM THE PLAINS INTO THE GREAT LAKES ON TUESDAY. THERE ARE SOME
DIFFERENCES IN THE TRACK OF THIS TROUGH/LOW WITH THE 14.00Z ECMWF
BEING FURTHER NORTH AND FASTER COMPARED TO THE GFS. WITH THE MORE
SOUTHERLY TRACK FROM NORTHERN MISSOURI TO CHICAGO...THE 14.00Z
GFS SOLUTION HAS THE MAIN SNOW BAND GOING FROM SIOUX FALLS SD
TOWARD THE TWIN CITIES. MEANWHILE...THE 14.00Z ECMWF TAKES THE
SURFACE LOW MORE ON A WEST TO EAST PATH BEFORE OCCLUDING IT IN
EASTERN WISCONSIN AND PUTS ITS MAIN SNOW BAND FROM SOUTHEAST
MINNESOTA INTO NORTH CENTRAL WISCONSIN. SOME HEAVY SNOW LOOKS
LIKELY WITH THIS STORM AT ITS CURRENT INTENSITY...SO WILL HAVE TO
WATCH THE TRENDS WITH THIS POTENT SYSTEM AS WE GET CLOSER TO IT.
&&
.AVIATION...(FOR THE 18Z TAFS THROUGH 18Z SATURDAY AFTERNOON)
ISSUED AT 1217 PM CDT FRI MAR 14 2014
FIRST FRONT IS THROUGH THE REGION WITH AN INCREASE IN NORTHWEST
WIND. SEVERAL GUSTS ABOVE 25 KTS OBSERVED...ESPECIALLY OVER HIGHER
TERRAIN AND OPEN AREAS...INCLUDING KRST. SECONDARY COLD FRONT
APPROACHING FROM THE NORTHWEST WILL ENHANCE THE GUSTINESS FOR A
FEW MORE HOURS JUST BEFORE SUNSET...WHEN DECOUPLING WILL ALLOW
SPEEDS TO SUBSIDE. UPSTREAM ACROSS MN THERE HAVE BEEN SOME LIGHT
SPRINKLES AND FLURRIES REPORTED. SOME OF THAT COULD SURVIVE TO
REACH KRST...BUT IF IT DOES IT WILL BE VERY LIGHT AND VERY
BRIEF...NARY WORTH A MENTION. ATTENTION THEN SHIFTS TO THE
DISTURBANCE MOVING THROUGH THE REGION FOR SATURDAY. BAND OF
FRONTOGENESIS LOOKS TO FOCUS CHANCES FOR SNOW FROM WNW- ESE.
NAM/CANADIAN A BIT MORE ROBUST...AND THUS FASTER/FURTHER NORTH
COULD IMPACT THE TAF LOCATIONS AFTER 15Z SAT. GFS/ECMWF A BIT
WEAKER AND FURTHER SOUTH/SLOWER KEEPING MUCH OF THE FOCUS JUST
SOUTH OF THE TAF LOCATIONS. THIS POTENTIAL SNOW PERIOD IS ON THE
EDGE OF THE FORECAST. FOR NOW JUST ADDED LIGHT SNOW LATE IN THE
TAF PERIOD AND LATER ISSUANCES SHOULD BE ABLE TO ADD MORE DETAIL.
&&
.ARX WATCHES/WARNINGS/ADVISORIES...
WI...NONE.
MN...NONE.
IA...NONE.
&&
$$
SHORT TERM...HALBACH
LONG TERM...HALBACH
AVIATION...MW