Forecast Discussions mentioning any of "HRRR" "RAP" "RUC13" "RUC" "RR" received at GSD on 02/05/24


Area Forecast Discussion
National Weather Service Amarillo TX
523 PM CST Sun Feb 4 2024 ...New UPDATE, AVIATION... .UPDATE... Issued at 516 PM CST Sun Feb 4 2024 Main thing to watch for tonight will be patchy fog across the northern Panhandles. Latest HREF probabilities only have around a 10 to 30 percent chance for dropping below 1 mile visibility, but will continue to watch trends with the newest runs over the next few hours. The weak northerly winds will become westerly and downslope during the overnight hours which would likely prevent fog from becoming too widespread. Otherwise, temperatures for most tonight should drop to near or just above freezing across the area given persistent cloud cover which should limit radiational cooling. Muscha && .SHORT TERM ... (This evening through Monday night) Issued at 125 PM CST Sun Feb 4 2024 Some spotty showers have waned this afternoon. However, cloud cover has increased through much of the combined Panhandles as of this writing. Based on current GOES-16 water vapor and RAP analysis the cutoff low that came through the other is now elongated from western KS down into AL and LA. Northwesterly winds are currently blowing around 15 to 20 kts with gusts up to 30 kts. This mornings upper air sounding had H85 temperatures around 3.8 degrees C. Based on model analysis these temperatures just off the surface are progged to drop to around 1.7 degrees C thanks to this system just to the east. These cooler temperatures are looking to stick around through tomorrow as well leading to daytime highs topping out in the lower 50s today and mid 50s tomorrow. The few degrees warmer temps tomorrow will be mainly thanks to the start of a ridge building in from the west allowing for skies to clear out in the afternoon. It may be late in the evening tomorrow when surface winds finally return to the southwest. 36 && .LONG TERM ... (Tuesday through next Saturday) Issued at 125 PM CST Sun Feb 4 2024 Warming temperatures under an upper level ridge are expected to be in place for the combined Panhandles Tuesday and Wednesday. This ridge will be on its way out of the area late Wed with the next upper level trough progged to be over the Desert Southwest. Strong southwest winds aloft on the leading edge of this trough are also progged to be entering the area with some breezy to windy conditions possibly in store for the Panhandles. Surface winds may pick up to the 20 to 30 mph range with much higher gusts possible as a stacked jet lay overhead. Wednesday night some of the best dynamics associated with this next system will be bringing some chance PoPs overnight into Thu morning. Deterministic models have consistently been showing some rain chances going into Thu morning, and now the NBM is starting to catch on with 30 PoPs mainly across the southeastern half of the FA. With a trough overhead going into Fri and Sat, expecting closer to normal temperatures as the ridge gets displaced. There are hints at another system possibly brings a second round of showers in for Sat night. 36 && .AVIATION... (00Z TAFS) Issued at 516 PM CST Sun Feb 4 2024 Low clouds will lead to ceiling restrictions at all sites during this TAF cycle. TAFs may be a bit pessimistic to begin this issuance, but ceilings will drop into the MVFR to IFR range at all sites before 06z. In addition to the low ceilings, some patchy fog may develop across portions of the Panhandles. KGUY/KDHT currently have around a 10-20 percent chance at seeing fog at the sites so have opted to keep mentions out for now. Conditions should improve after sunrise with light winds forecast during the daytime hours. Muscha && .PRELIMINARY POINT TEMPS/POPS... Amarillo TX 36 57 36 64 / 0 0 0 0 Beaver OK 36 56 35 65 / 10 0 0 0 Boise City OK 29 57 35 63 / 0 0 0 0 Borger TX 39 59 38 67 / 10 0 0 0 Boys Ranch TX 35 59 35 65 / 0 0 0 0 Canyon TX 37 57 35 63 / 0 0 0 0 Clarendon TX 38 58 37 63 / 10 0 0 0 Dalhart TX 30 56 32 63 / 0 0 0 0 Guymon OK 35 56 35 65 / 0 0 0 0 Hereford TX 34 58 35 65 / 0 0 0 0 Lipscomb TX 37 57 35 64 / 10 0 0 0 Pampa TX 37 56 38 64 / 10 0 0 0 Shamrock TX 39 59 36 62 / 10 0 0 0 Wellington TX 39 59 36 63 / 10 0 0 0 && .AMA WATCHES/WARNINGS/ADVISORIES... TX...None. OK...None. && $$ SHORT TERM...36 LONG TERM....36 AVIATION...05
Area Forecast Discussion
National Weather Service Columbia SC
724 PM EST Sun Feb 4 2024 .SYNOPSIS... A closed upper low and associated surface cyclone will track along the Gulf Coast through tonight and then shift off the southeast coast by Tuesday. This system will bring increased chances for rain to much of the region along with breezy conditions. A period of dry weather follows with warmer temperatures expected towards the end of the week. && .NEAR TERM /UNTIL 6 AM MONDAY MORNING/... In-situ cold air damming developing from the central Midlands across the CSRA. Deep mature cyclone near the Florida/AL/GA border. Several mid short waves in northern Florida rotating north into GA around the vertically stacked system. A pressure ridge centered over the Mid Atlantic is extending into the area. There is a tight moisture gradient across the area with much drier air north of CAE. Surface dew points are now increasing as the east flow develops. Precipitable water will increase to near 1 inch overnight, deepest moisture from the CSRA into the southeast Midlands. The latest HRRR and RAP and other deterministic guidance suggest rain will continue to slowly spread north into the central Midlands mainly after 05z. Isentropic lift appears to be strongest between 06z-12z. Overall qpf is not expected to very high, around 0.25-0.50 inch, in the southeast Midlands/CSRA and less toward CAE. Very little qpf north of CAE. So raised pops overnight into the central Midlands, otherwise forecast on track. Overnight low temps in the mid 30s near the NC/SC border to the low 40s CSRA. && .SHORT TERM /6 AM MONDAY MORNING THROUGH TUESDAY NIGHT/... The aforementioned storm system moves from the GOMEX at the start of the period, across Florida, and into the Atlantic Ocean by daybreak Tuesday. The storm will then gradually moves away from the region during the remainder of the short term. Monday and Monday Night: Latest guidance continues to show lingering rain showers across the Central and Southern Midlands and CSRA Monday morning tapering off as the day goes on. Precipitation amounts on Monday should be light and under a tenth of an inch. Skies will begin to clear out in the afternoon and evening from northwest to southeast. The combination of clouds, showers, and breezy northeasterly winds will keep temperatures near to slightly below normal for early February. The clearing skies could produce subfreezing temperatures over the Northern Midlands Monday Night. Tuesday and Tuesday Night: Sunny and cool conditions are expected on Tuesday as high pressure approaches from the northwest. It may still be breezy at times, especially over the Eastern Midlands but the pressure gradient is expected to weaken during the daytime hours as the offshore storm continues to head out to sea. Continued northeasterly flow keeps temperatures around normal values during the daytime hours. Decreasing winds and clear skies will promote radiational cooling at night with widespread subfreezing temperatures likely. && .LONG TERM /WEDNESDAY THROUGH SUNDAY/... Dry weather continues through at least Thursday Night as upper ridging over the Central CONUS moves east. Wednesday should be sunny and cool once again due to high pressure and weak cold air wedging. Temperatures finally begin to warm on Thursday as the upper ridge builds overhead and winds and the surface shift from northeast to southeast. Clouds may begin to increase on Thursday as a cold front approaches from the west. Southwesterly flow sets up for Friday and Saturday ahead of the boundary allowing temperatures to reach above normal values despite the expected cloudiness. Rain chances will also rise by the end of the period but there are significant differences in the deterministic guidance regarding the late week large scale pattern. Currently, there is a Low (20%-40%) chance for rain across the FA on Friday and Saturday, this time favoring the Northern Midlands. && .AVIATION /00Z MONDAY THROUGH FRIDAY/... A low pressure system will bring rain, ceiling restrictions, and breezy winds possibly resulting in LLWS tonight into Monday morning. Deep moisture will work into the region this evening causing ceilings to lower and spreading rain into area. Expect predominantly MVFR conditions for much of the night either from reduced visibility or stratus. AGS, DNL, and OGB will have the deepest moisture of them for longer resulting in a longer period of restrictions while VFR conditions at CAE and CUB could hold until 06Z or so. There may be a period of IFR ceilings at the TAF sites early Monday morning but confidence is low. Strong winds associated with the system will promote 40 to 50 kt ENE winds at 2000 ft, likely meeting LLWS criteria with sustained NE surface winds at 10 to 15 kts. Expect LLWS to end by 18Z Monday with the jet exiting the area. Although rainfall should move away from the TAF sites from 12 to 15Z, ceilings on the backside of the system will likely remain MVFR through the end or almost the end of the 24 hour TAF period. EXTENDED AVIATION OUTLOOK...No significant impacts to aviation expected Tuesday through Friday. && .CAE WATCHES/WARNINGS/ADVISORIES... GA...Lake Wind Advisory until 7 AM EST Tuesday for GAZ040-063>065- 077. SC...Lake Wind Advisory until 7 AM EST Tuesday for SCZ016-018- 020>022-025>031-035-037-038-041-115-116-135>137. && $$
Area Forecast Discussion
National Weather Service Cleveland OH
927 PM EST Sun Feb 4 2024 .SYNOPSIS... High pressure will remain anchored across the central Great Lakes through Wednesday before moving east Thursday. This will allow a cold front to cross the region Friday. && .NEAR TERM /THROUGH MONDAY NIGHT/... 915 pm update... Overall, the near term forecast remains on track. We slowed down the forecast progression of the clouds moving back in later tonight. The previous forecast was just a touch too aggressive on timing. THe cloud deck we are watching to move in is currently just now crossing other side of Lake Erie`s lakeshore on the Canadian side. No other changes were needed at this time. 615 pm update... No forecast adjustments were needed with this early evening update. Previous discussion... Very quiet conditions will continue through the near term period as a large dome of high pressure remains in solid control of the Great Lakes. Visible satellite and water vapor loops this afternoon show the Omega block holding firm characterized by a sharp mid/upper ridge over the Plains, Midwest, and western Great Lakes in between a broad mid/upper low offshore of California and a mid/upper trough over the North Atlantic. The Omega ridge is being undercut by another closed low over the Louisiana Gulf coast. The southern Great Lakes and Ohio Valley will remain on the confluent side of this ridge tonight through Monday night as it gradually folds east into the central Great Lakes in response to the energy pushing into the western CONUS while troughing holds over the North Atlantic, causing the ridge axis to pinch off overhead. This will allow strong 1020-1025 mb surface high pressure anchored over the central Great Lakes this afternoon to remain nearly stationary through the period leading to a continuation of the fair weather. The only concern continues to be nocturnal fog and low stratus development. This has occurred over Lake Erie and into NW Ohio the past couple of nights due to ENE low-level flow across the lake below the inversion associated with the high pressure ridging, essentially trapping low-level moisture. Hi-res guidance suggests this will occur again late tonight and early Monday morning which is also supported by NAM and RAP forecast soundings which show the strong inversion below 850 mb, so added fog to NW Ohio in the 06-15Z Monday timeframe, as well as increased cloud cover above NBM guidance. Some increase in clouds is possible farther east late tonight into Monday morning, but it should be patchier since it will be away from the low-level moisture feed off the lake. Any fog and low stratus will gradually burn off Monday morning, but like the past 2 days, it will take until 16 or 17Z to completely dissipate. This will allow for mostly sunny skies Monday afternoon. The same pattern will remain in place Monday night, so increased clouds again, especially in NW Ohio. Highs will range from the upper 30s to low 40s Monday, with the coolest readings near the lakeshore given the ENE flow. Lows tonight will drop into the mid to upper 20s, with low to mid 20s Monday night. && .SHORT TERM /TUESDAY THROUGH WEDNESDAY NIGHT/... The short term period remains quiet and dry as high pressure remains overhead much of the Great Lakes and Northeast regions of the CONUS. Above normal high temperature expected both Tuesday and Wednesday with highs in the low to mid 40s Tuesday and upper 40s Wednesday. Mostly clear skies Tuesday night will allow for low temperatures to drop into the mid 20s areawide. Additional cloud cover moving overhead from the west ahead of our next system will keep overnight lows Wednesday night warmer and in the low to mid 30s. && .LONG TERM /THURSDAY THROUGH SUNDAY/... Surface and mid level ridging exits the region as our next weather system pushes eastward. Low pressure centered over the Northern Plains will lift a warm front northeastward across the northern Ohio Valley during the day Thursday. Precipitation in the form of rain arrives Thursday night as the low moves into the Great Lakes region. Rain chances will continue through the end of the week and into the weekend as the surface low exits eastward but leaves behind lingering moisture and upper support. Above normal temperatures through the long term with highs in the upper 40s to mid 50s and lows ranging between the upper 30s to mid 40s. && .AVIATION /00Z Monday THROUGH Friday/... Mostly clear skies and VFR conditions this evening will give way to MVFR and IFR conditions later tonight into Monday morning or midday. Moisture trapped under a strong inversion will help develop a very low stratus deck and possibly some patchy fog, especially over northwest Ohio later tonight. CLE and MFD may see IFR conditions develop after 09z. TOL and FDY will likely see IFR conditions after 09z with LIFR conditions possibly by early Monday morning. The very low ceilings and patchy fog will scattered out after 15z or 16z Monday morning for most of the area. There could be some MVFR ceilings holding on until after 21z for couple spots. East to northeast winds will average 5-10 knots through Monday. Outlook...Non-VFR is possible in rain showers Friday. && .MARINE... High pressure continues to dominate the weather pattern through the middle of the week. This will allow for northerly winds 5-10 knots to persist through the start of the week. Onshore flow may briefly increase to 10-15 knots and allow for waves in the central basin to build to 2-3 feet, though winds and waves remain below Small Craft Advisory criteria. Winds gradually turn easterly, then southeasterly, by Wednesday morning while decreasing below 10 knots. A warm front lifts northeast over Lake Erie by Thursday ahead of low pressure system that arrives Thursday night into Friday. With the arrival of this system, anticipate southerly winds to increase to 15- 20 knots Friday and Saturday. Winds turn westerly Saturday night behind a cold front. Can`t rule out future forecasts issuing marine headlines as this low pressure system approaches toward the end of the week. && .CLE WATCHES/WARNINGS/ADVISORIES... OH...None. PA...None. MARINE...None. && $$ SYNOPSIS...Garuckas NEAR TERM...Garuckas/Griffin SHORT TERM...Iverson LONG TERM...Iverson AVIATION...Griffin MARINE...Iverson
Area Forecast Discussion
National Weather Service Cheyenne WY
718 PM MST Sun Feb 4 2024 .KEY MESSAGES... - Fog may return this evening across the Nebraska Panhandle and Platte River Valley into Goshen County...possibly Niobrara County as well. - Unsettled weather returns as another storm system will approach the area Wednesday into Thursday. Rounds of moderate to heavy snow will be possible across the Sierra Madre and Snowy mountains. Lower confidence for snow to reach the Valleys. && .UPDATE... Issued at 715 PM MST Sun Feb 4 2024 Gridded forecasts have been updated since minimum temperatures have fallen a bit faster than expected at some locations. Lowered low temperatures at Rawlins and Cheyenne based on trends. && .SHORT TERM /THROUGH TUESDAY NIGHT/... Issued at 200 PM MST Sun Feb 4 2024 Currently...Upper low that brought us the snow the past 24 hours currently over southern Arkansas this afternoon. Stratus layer just east of the Nebraska Panhandle this afternoon. Across southeast Wyoming...seeing mostly sunny skies and dry weather. HRRR aviation guidance showing low conditions returning to the east tier counties of the Nebraska Panhandle. Confidence is low on this happening as GFS shows downsloping westerly winds this evening into Monday morning. Given how well the HRRR has been performing...it is hard to go against it. So added patchy fog into tonights forecast across lower elevations of the Panhandle. Concerns for elevated winds early Monday as GFS 700mb winds increase to 40kts out across Carbon County at 09Z and up to 50kts by 12Z. WRKHGT guidance showing 850mb Craig to Casper height gradients up to 60mtrs...but 700mb height gradients only 37-38mtrs. Feel pretty confident that strong winds are not going to happen...but did increase winds across northern Carbon and Albany Counties. Nice day Monday as upper ridge builds over the CWA. 700mb temperatures back up to +2 to +3C Monday afternoon. Upper 50s across the eastern CWA Monday with mid 40s Monday afternoon. Similar temperatures expected Tuesday. && .LONG TERM /WEDNESDAY THROUGH SUNDAY/... Issued at 200 PM MST Sun Feb 4 2024 Much of the long range forecast remains unchanged with the upper level ridge slowly migrating eastwards towards the Great Plains and an upper level long wave trough digging from the Western Seaboard to the Intermountain West. Once the upper level feature fully moves across the CWA, which is now progged later in the period, precipitation chances increase for the west, with 30% PoPs across Carbon County and upwards to 60% or greater for the mountain areas. Some considerable changes to the long term forecast within the last 24 hours, with models having difficulties locking onto either the longwave trough digging across the region or a developing closed low positioned across northeast Wyoming late Wednesday night. Regardless of the model solutions, it appears the mountain zones will remain favored from either the southwesterly flow favoring the Sierra Madres with the majority of upslope flow shadowing the Snowy Mountains and adjacent valleys, bringing much higher accumulations for the Sierra Madres throughout the event, or the positioning of the closed low bringing wrap around moisture across Carbon County and including both the Sierra Madres and Snowy Range. Ultimately, decided to continue cutting PoPs for areas along and east of the I- 25 corridor to account for both solutions. In addition to the snow chances, probabilities continue to increase for gusty to stronger winds for southeast Wyoming Thursday into Friday. Internal model guidance has begun picking up on greater than 35% chances of elevated winds ranging from 40 to 58 mph winds for the wind prone areas in southeast Wyoming. Good agreement between local in-house model guidance and the latest NBM version for Probability of Exceeding 41kts have increased confidence for stronger winds with higher likelihoods (greater than 50% per the NBM) of stronger winds along and east of the Central Laramie Range on Thursday and even extending west into the Arlington area. Therefore, started increasing winds to account for the newer solutions. From late week through to the weekend, long range models have begun picking up on a secondary stacked closed low digging from the Pacific Northwest through to the Four Corners by Saturday morning before rejoining the main flow less than 24 hour later. While there are some model agreement between the Euro and the GFS in terms of overall pattern and timing, details remain uncertain with the GFS having a disorganized system with better positioning for our CWA to bring some light precipitation through upslope flow and the Euro being a much more organized system but also much too far to the south to create impacts for the CWA. Will allow the current NBM to run its course throughout the week with cooler temperatures and low end chances for precipitation until the details can become more clear. && .AVIATION /00Z TAFS THROUGH 00Z TUESDAY/... Issued at 455 PM MST Sun Feb 4 2024 Upper level ridge axis will remain over the Great Plains tonight and Monday, which will result in dry weather and warmer temperatures. The only Aviation concern heading into tonight will be the potential and intensity of fog for portions of the western Nebraska Panhandle. HAZARDS/WEATHER TRENDS: VFR conditions anticipated for the southeast Wyoming terminals and KCDR tonight and Monday with increasing southwest winds. Gusts of 20 to 30 knots are expected mid to late Monday morning, with the highest gusts at KRWL. For southern and central Nebraska Panhandle, will continue to monitor the potential for fog with recent models backing off on fog potential (15% to 30% chance). Kept IFR conditions for mainly KSNY and KBFF for now, but may need to adjust further for MVFR or VFR conditions tonight. && .CYS WATCHES/WARNINGS/ADVISORIES... WY...None. NE...None. && $$ UPDATE...RUBIN SHORT TERM...GCC LONG TERM...MRD AVIATION...MRD
Area Forecast Discussion
National Weather Service Goodland KS
250 PM MST Sun Feb 4 2024 .KEY MESSAGES... - Dense fog may develop over portions of the area after sunset and persist through Monday morning. - Breezy to strong southwesterly winds may create hazardous travel conditions across the region on Wednesday. - Low confidence currently of accumulating snowfall this coming weekend. && .SHORT TERM /THROUGH TUESDAY NIGHT/... Issued at 225 PM MST Sun Feb 4 2024 Overview: An upper level ridge will amplify over the central CONUS in this period.. as a broad upper level low (presently situated over the Southern Plains and Deep South) progresses ESE into the Gulf of Mexico (Mon) then eastward into the Atlantic (Tue). Meanwhile, a large upper level low (centered offshore the northern California coast this afternoon) will gradually progress inland/eastward into the Intermountain West (Mon-Tue). Tonight: Fog may develop over portions (possibly much) of the area this evening and overnight, after light precipitation (rain) ends and 12-17 mph N-NNE winds become light/variable.. as ~1020 mb surface high pressure progresses southward over the region. Visibility forecasts via recent runs of the HRRR suggest that dense fog could rapidly develop over portions of the area after sunset (00-03 UTC time frame). Confidence in fog coverage, location and duration are below average. Mon-Tue night: Expect drier conditions and a gradual, modest warming trend as the aforementioned upper level ridge amplifies over the central CONUS. Low-level southerly return flow will become established in this period, most noticeably late Tue into Tue night.. as the ridge shifts east of the High Plains and upstream height falls and strengthening SW flow atop over the Rockies foster the development of an increasingly pronounced lee trough/cyclone in Colorado. While mostly clear skies may prevail for a period on Monday (after morning fog and/or stratus lifts), overcast conditions will quickly return Monday night into Tuesday.. via an influx of upper level moisture /cirrus/ as SW flow aloft strengthens over the central/southern Rockies. && .LONG TERM /WEDNESDAY THROUGH SATURDAY/... Issued at 1239 PM MST Sun Feb 4 2024 Overall the weather pattern has changed little from what was seen yesterday. Models continue to show a long wave trough over the western CONUS that gradually lifts east-northeast through the week. There continues to be a suggestion of a smaller scale short wave trough deepening over the Northern Plains Thursday as the main trough moves northeast. Another smaller scale trough may move over the forecast area Wednesday night/Thursday. As the main trough moves eastward, another small scale trough may move over the forecast area Friday ahead of another deepening trough over the Desert Southwest. Models seem to have slowed down the eastward progression of the long wave trough. However the small scale trough that develops over the forecast area Wednesday night into Thursday is still in a similar position to yesterday. There may have been a southward shift in its track from yesterday. However further shifts to the south may result in the trough tracking south of the forecast area. In addition the long range ensemble is still not optimistic for precipitation chances, with the best chance to receive .1" or more of precipitation continuing to be over the northern counties (10%). There is more of a mention in the forecast for snow than yesterday. However confidence is on the low side there will be precipitation the weekend when the snow is forecast. After Friday the models begin to disagree how quickly the next long wave trough will deepen over the Desert Southwest. The timing will affect when/if the next round of precipitation will move through the forecast area. While the track still looks hopeful for the forecast area, am hesitant to place much confidence in the forecast for the weekend given the models are not having run to run consistency with the long wave trough mid week, and are inconsistent with the long wave trough for the upcoming weekend. Regarding winds for Wednesday; as the prior shift mentioned, there is a potential for blowing dust given the winds and stability parameters. Latest potential for wind gusts over 40 MPH is 40-50% over the southwest quadrant of the forecast area for Wednesday afternoon. Even though the top of the ground is saturated now, the clear sky tomorrow will help the top of the ground dry out. There have been instances in the past when blowing dust occurred the day after a precipitation event because the top of the ground had dried out. Given the stability parameters, am thinking there could be corridors of blowing dust from bare fields, but not a wall of dust. Given the current state of the ground, confidence is low for blowing dust to be thick enough to drastically reduce visibilities. && .AVIATION /00Z TAFS THROUGH 00Z TUESDAY/... Issued at 245 PM MST Sun Feb 4 2024 MVFR-IFR conditions associated with low stratus are anticipated to prevail through the remainder of the afternoon. Fog, possibly dense, is anticipated to develop (at either or both terminals) within a few hours after sunset this evening. Fog may persist several hours after sunrise Monday morning.. possibly through ~15-16 UTC Monday. Confidence in fog location, coverage and duration is below average. Either way, conditions should deteriorate to IFR-LIFR (via fog or stratus) this evening and overnight. N to NNE winds at 11-16 knots (late this afternoon) will weaken and become light/variable after sunset.. as ~1020 mb surface high pressure progresses southward over the region. Winds will shift to the S-SSW and increase to 10-15 knots late Monday morning (15-18 UTC) as surface high pressure progresses east of the region.. and a modest southerly return flow regime ensues. && .GLD WATCHES/WARNINGS/ADVISORIES... KS...None. CO...None. NE...None. && $$ UPDATE...Vincent SHORT TERM...Vincent LONG TERM...99/JTL AVIATION...Vincent
Area Forecast Discussion
National Weather Service Louisville KY
924 PM EST Sun Feb 4 2024 .KEY MESSAGES... * Dry and above normal temperatures most of the next work week * Rain chances return Thursday Night through Saturday && .UPDATE... Issued at 923 PM EST Sun Feb 4 2024 No significant changes to this evening`s update, other than the cloud cover. Low pressure moving across the southeast CONUS is casting a overcast layer of high level cirrus across the region. Model forecasts are not handling the situation well, but the latest HRRR guidance has a decent handle of the cloud cover. Nudged the forecast towards the HRRR for cloud cover. Otherwise, the rest of the forecast remains on track. && .SHORT TERM /THROUGH MONDAY NIGHT/... Issued at 225 PM EST Sun Feb 4 2024 Thin cirrus is fanning out across the lower Ohio Valley today, with the greater concentration of clouds located to our south and west. This is where the greater lift associated with the upper low is confined, with the primary moisture belt stretching from Florida to Missouri. This keeps up just north of the thicker cloud cover. The thin cirrus over our region has had little effect on the sfc temps, which have warmed into the mid to upper 50s. Some Mesonet sites are sitting right at 60 this afternoon now too. Far western Kentucky is slightly cooler due to the thicker cloud cover clipping that part of the state. For tonight, the quiet weather will continue. The upper low will pivot further south along the Gulf Coast overnight, which will pull the moisture farther south. This should result in the upper clouds retreating overnight, and should be another efficient radiative cooling night for many. The clouds could hang on a bit longer across our south, which could lead to min temps by tomorrow morning being just a few degrees warmer than areas to the north. For tomorrow, more sunshine and less clouds is on the table as the upper low to our south pulls farther away. Winds will remain a light north-northeasterly flow through the day. Temps will once again be above climate normals for this time of year, though possibly not as warm as today due to the cool NNE flow expected tomorrow. Temps will be in the low to mid 50s by tomorrow afternoon. && .LONG TERM /TUESDAY THROUGH SUNDAY/... Issued at 249 PM EST Sun Feb 4 2024 The synoptic pattern Monday night begins with a low pressure system over Florida rotating east over the western Atlantic. Ridging through a deep layer will extend from Mexico and Texas northeast over the Plains, Great Lakes, and into Quebec. This will produce deep-layer northerly flow over the Ohio Valley and a cool, dry airmass. Temperatures Monday night should tumble into the upper 20s and lower 30s, but could stabilize early Tuesday should a stratus layer build southwest from Ohio. HREF data and some model forecast soundings certainly point to the idea of low clouds spreading southwest over portions of southern IN and northern KY early Tuesday, though confidence remains fairly low on the southern extent of the clouds. But went ahead and bumped up sky cover from NBM, but future updates may need to increase sky cover further. The second half of Tuesday looks partly cloudy with highs in the lower 50s for most. The upper level ridge over the central CONUS amplifies and gradually shifts eastward through Thursday, as a deep upper level trough moves slowly over the western US. With high pressure still in place, our weather will remain dry and mild through Thursday. Temperatures will be on the upswing Wednesday and Thursday as southerly low-level flow develops on the backside of departing sfc ridging. Think we can safely go above most model guidance in this pattern, especially Thursday as southerly winds increase more substantially ahead of a Plains storm system. Currently have highs in the mid 50s to near 60 F for Wednesday and widespread low 60s for Thursday. A strong wave of low pressure moving NE across portions of the northern Plains and Upper Midwest will push a cold front toward the MS Valley Thursday into Thursday night. A band of showers ahead of the cold front appears likely to move across southern IN and central KY as early as Thursday night. Forcing looks quite good, with a potential ~50 kt SW LLJ developing beneath the left exit region of an intensifying jet streak over the southern Plains. Fortunately, instability looks limited at best. The potential for thunderstorms is low at this time. At least scattered rain chances linger Friday into Saturday, in part due to model differences with the fropa and uncertainty regarding mesoscale details at this time range. Temperatures on Friday will remain quite mild ahead of the actual fropa, so cannot rule out the idea of marginal destabilization. Depending on fropa, Saturday may end up mainly dry though forecast confidence is low at this time. A stronger southern-stream storm may then bring heavier rainfall to the region late Sunday into early next week. && .AVIATION /00Z TAFS THROUGH 06Z TUESDAY/... Issued at 614 PM EST Sun Feb 4 2024 VFR conditions will continue as expected. Thin cirrus continues to spread across the region this evening, though no impacts will result. These clouds will retreat overnight, leading to SCT to SKC for most terminals by tomorrow morning. Winds will remain light as well, from the NNE through the period between 5 and 10 kts. && .LMK WATCHES/WARNINGS/ADVISORIES... KY...None. IN...None. && $$ UPDATE...MK SHORT TERM...CJP LONG TERM...EBW AVIATION...CJP/MK
Area Forecast Discussion...Updated Aviation
National Weather Service Saint Louis MO
939 PM CST Sun Feb 4 2024 .KEY MESSAGES... - Above normal temperatures will continue into next weekend with highs 15 to 20 degrees above normal Wednesday into Friday. - There will be a chance of rain Thursday through Sunday with the best chance on Thursday night (40-70%). && .SHORT TERM... (Through Late Monday Night) Issued at 159 PM CST Sun Feb 4 2024 The light rain remained confined to the far western and southern parts of the CWA late last night and this morning and is now staying clear of the area with only mid-level returns seen on radar. These returns will become fewer as the upper low currently over the Lower Mississippi Valley moves off to the east. The HREF continues to show that upper ridging will build into the Midwest tonight into Monday which will continue the dry weather through at least midweek. A surface high will move south out a Canada moving through our area tomorrow night. The latest RAP soundings are showing a low level inversion under a clearing sky over the northern part of the CWA tonight which will be enough for some patchy/areas of fog. Even with north to northeast winds and February sun, 850mb temperatures are around 5C. Lows tonight will be around 30 and in the upper 20s on Monday night with lighter winds which are still above normal. Highs on Monday are expected to be around 50. Britt && .LONG TERM... (Tuesday through Next Sunday) Issued at 159 PM CST Sun Feb 4 2024 There remains good agreement between the deterministic models and their respective ensemble runs that the upper ridge will continue to move across the central CONUS Tuesday and Wednesday keeping our area dry. Then guidance continues to show the upper trough over the western CONUS lifting out with a consensus showing the lead upper low moving through the upper Midwest on Friday. As opposed to yesterday, the attendant front becomes elongated under the zonal flow and may not push through the area until late Friday. The ensembles have been consistent in showing that 40-70 percent of their members have rain chances Thursday night which matches the operational runs QPF. Then there are lingering chance of rain Friday along the front underneath the zonal flow. There is also some risk for thunderstorms late Thursday/Thursday night as both the GFS/ECMWF are showing MUCAPES up to around 500 J/kg over parts of the CWA. Latest NBM has added a chance of thunderstorms over southeast Missouri on Thursday night. There is more uncertainty with the weather behind the front next weekend as there is increasing spread in solutions ahead of another upper trough that will approach Missouri and Illinois by late next weekend. While there is some low chances for ran on Saturday, latest guidance suggests that there is a better chance for rain Saturday night into Sunday. Above normal temperatures still look to be the rule throughout the extended, especially Wednesday through Friday when 850mb mean temperatures will be in the 5-10C range and low level flow will be out of the southwest ahead of the front. Continued the previous shift`s trend and upped high temperatures to NBM 50th percentile and locally higher during this timeframe. Britt && .AVIATION... (For the 06z TAFs through 06z Monday Night) Issued at 931 PM CST Sun Feb 4 2024 Concerns for fog and stratus entering parts of northeast Missouri and west-central Illinois late tonight into Monday morning have decreased this evening. Latest short-term guidance has slowed the advection, and latest nighttime microphysics RGB imagery shows the fog/stratus still in Wisconsin. Given the weak surface to 950 hPa flow (around 10 knots), this area would not make it down to west- central Illinois before sunrise. Therefore, unless there is pretty sizable expansion overnight, we are not expecting fog/stratus in the area. Have therefore taken out the fog mention at KUIN. Persistent NNE winds will continue overnight tonight through Monday, with winds becoming light/variable Monday evening with the approach of a surface ridge of high pressure. Gosselin && .LSX WATCHES/WARNINGS/ADVISORIES... MO...None. IL...None. && $$ WFO LSX
Area Forecast Discussion...UPDATED
National Weather Service Morristown TN
933 PM EST Sun Feb 4 2024 ...New UPDATE... .UPDATE... Issued at 927 PM EST Sun Feb 4 2024 A closed low near the FL Panhadle will continue to meander SE through tonight. So far, Light rain from a midlevel cloud deck has stayed just south of our area, and this trend is expected to continue as the low center drifts farther away. The update will lower PoPs in the southern fringes of East TN and SW NC. Observed temps this evening have been quite a bit warmer than forecast, so the update will raise hourly temps, and raise the forecast low slightly. Late in the night, the mid/high clouds should clear enough to allow for some radiational cooling, although winds will probably stay above calm in most spots. Winds in the mountains have remained under Advisory criteria so far, with the highest gusts observed in the 25 to 30 mph range. A slight increase is possible but gusts should remain under 40 mph. && .SHORT TERM... (This evening through Monday) Issued at 305 PM EST Sun Feb 4 2024 Key Messages: 1. Perhaps some light rain near the Georgia border through this evening. Otherwise dry conditions expected. 2. Warm, with low afternoon relative humidity on Monday. Discussion: Upper low over the Arklamiss area will continue to pivot/shift southeast through this evening and overnight. Regional radar mosaic shows the northern edge of the precip shield associated with this feature aligned from roughly Huntsville to the Atlanta area this afternoon. The latest high resolution guidance doens`t really bring it much further north through the evening hours before the upper low pulls too far away for our CWA to have any realistic chance of seeing rainfall. Trended PoPs towards the HRRR guidance in that respect, which keeps rain chances limited to low-end chance values and confined to essentially the areas right along the GA border. Could see that even being generous if trends continue, but There was also some potential for gusty winds in the mountains and in the valley today. So far, that has not materialized though, likely owing to the lack of inversion just above mountain top levels and a weaker H85 wind field which some guidance showed was likely to occur. Cove Mountain briefly reached 30 mph, and the Morristown area saw gusts to around 20 mph, but those have subsided and I doubt there will be much of a resurgence. Winds in the mountains may pick up later this evening as models depict a strengthening of the H85 wind field, but at this point I doubt it gets close to advisory levels. Otherwise, the only other forecast item of note is that I undercut NBM guidance on dewpoints tomorrow. Used some CONSShort and NBM 10th percentile to lower expected dewpoints tomorrow during the day. This brings afternoon RH values into the 30-35 percent range across much of the forecast area. && .LONG TERM... (Monday night through next Sunday) Issued at 305 PM EST Sun Feb 4 2024 Key Messages: 1. Beautiful weather Monday night through Thursday with above normal temperatures. 3. Chance of rain Friday through Sunday. Discussion: Still looks like quiet weather Monday night through about Thursday night. A deep surface and upper low to the south over FLorida and the southeast Atlantic Coast will slowly drift east through Tuesday with higher surface pressure building eastward Monday night and Tuesday. Aloft ridging over the Mississippi Valley and western Gulf states will strengthen and shift westward through the middle of the week. Warm and dry weather continues with sunny days Tuesday and Wednesday and cool to cold nights. Temperatures stay above normal in the mid 50s to around 60 days and the mid 20s to mid 30s nights. Thursday the surface high and ridging shifts east of the Appalachians. Another low pressure area develops over the northern plains with a cold front south through central Texas. A warm front is forecast to develop ahead of this front and move across Tennessee Friday. This will increase southerly flow early Friday with a good chance of showers. The models want to slow the system down and develop a trailing surface low near Memphis early Saturday. With high pressure to the east and a continued southerly flow, more rain and warm temperatures will continua across the forecast area. Then even another surface low develops to the west, southwest and will keep rain chances through Sunday. Am not that confident of the progression of this system the last 3 days of the forecast but will keep rain chances through the weekend. Rainfall amounts right now are expected to be light each day with no flood concerns. && .AVIATION... (00Z TAFS) Issued at 615 PM EST Sun Feb 4 2024 Mid to high level clouds will be over the area through tonight. Rain is expected to stay just south of CHA overnight, so VFR conditions will continue. Winds will remain in the 5-10 kt range from the NE through this period. Clouds will exit the area in the morning. && .PRELIMINARY POINT TEMPS/POPS... Chattanooga Airport, TN 56 40 62 36 / 30 40 10 0 Knoxville McGhee Tyson Airport, TN 59 37 61 32 / 0 0 0 0 Oak Ridge, TN 59 39 61 33 / 0 0 0 0 Tri Cities Airport, TN 59 34 59 29 / 0 0 0 0 && .MRX WATCHES/WARNINGS/ADVISORIES... NC...NONE. TN...NONE. VA...NONE. && $$ SHORT TERM...DGS LONG TERM....TD AVIATION...DGS
Area Forecast Discussion
National Weather Service Reno NV
241 PM PST Sun Feb 4 2024 .SYNOPSIS... A significant winter storm with heavy snowfall continues to impact the Sierra, northeast California, and far western Nevada communities going through this afternoon. This storm is anticipated to become more showery going into Monday with some portions of the region seeing a transition to rain or a wintry mix. Travel is highly discouraged during this event due to the dangerous and possibly life- threatening winter weather conditions, especially in the Sierra. Additional winter storms are possible through the end of the work week, though they will be much weaker in comparison to today`s system. Dry conditions look to return to the region over the weekend in the latest forecast. && .DISCUSSION... Today-Monday (Winter Storm): * CHANGES/MAIN POINTS: The Winter Storm Warning continues within the region as well as a Winter Weather Advisory within northern Washoe county through 10 AM PST on Monday (Refer to www.weather.gov/rev/winter for the latest details on this winter event including a forecast map of additional snowfall). Dangerous winter weather conditions along with strong wind gusts are anticipated for the remainder of today and going into Monday morning in the effected areas. Travel will be extremely dangerous during this time and the combination of the heavy, wet snow and strong winds could cause some potential damage to trees and infrastructure. * MONO COUNTY: The latest radar imagery as well as webcam images from Mammoth Mountain continue to show a steady snowfall ongoing within Mono County. Upon looking at the snowband probability from the latest run of the HREF, several members display a decent probability (0.2-0.4) of a snowband occurring over Mono County through at least midnight tonight and possibly a few hours into early Monday. The highest probabilities in this range appear to be between 4 PM and 8 PM PST this evening. With this signal, the HREF snowfall rates of 3 inches or higher per hour in far western portions look to be appropriate at times during the rest of Sunday. The HREF has other portions of the county with snowfall rates around 2 inches per hour or lower with some localized areas of greater than 2 inch per hour rates. Higher elevations also have wind gusts up to around 100 kts possible through the rest of today and going into the night. While snow showers are to continue in Mono County through Monday, the HREF has snow rates lowering greatly after the morning hours. * TAHOE BASIN: P-type has just begun to transition from snow to rain at KTVL which is about 2 hours sooner than what the HREF was predicting. The remaining areas in the Tahoe Basin are expected to remain mostly snow with the HREF showing snow rates lowering to around 1 inch per hour or less. The entire area then transitions back to the snow P-type around midnight tonight as the pass level incurs a snowfall rate of around 1-2 inches per hour. By the afternoon hours of Monday, the HREF has snowfall rates declining quite a bit in this area before dropping to zero by Monday night. One ongoing concern involves southerly winds gusting up to around or above 80 kts in some portions of the area for the remainder of today and into the overnight hours which will allow the threat of dangerous white-out conditions to continue. * WESTERN NV/NORTHEAST CA: As snow levels are forecast to rise going into the afternoon hours, the ongoing precipitation of snow should transition to all rain or a rain/snow mix by evening hours with snowfall rates declining. Going through tonight, the latest HRRR run suggests another burst of wintry precipitation within portions of northeastern CA around 10-11 PM PST that lasts until just after midnight with additional snowfall of 1 inch in lower elevations to around 3 inches in higher elevations possible. By late morning/early afternoon on Monday, precipitation chances diminish to around 20-30% for this area with minimal snowfall accumulation returning overnight for lower elevations of less than an inch and around 1 inch in higher elevations. Tuesday through the Weekend: * Chances for accumulating snowfall diminish areawide early Tuesday morning. Some wrap-around rain/snow showers may move into areas generally south of US-50 by mid-late morning Tuesday, but any additional impactful snow accumulations look unlikely. * The early week winter weather system is expected to clear out on Wednesday, but the chances for more winter weather storms remain present through the end of the work week. However, any additional storms will have a lesser impact compared to the current storm due to the lack of subtropical moisture with the Pacific upper air jet being too far south of the CWA. Travel impacts for trans-Sierra routes are possible as a result. * With long term models showing a Pacific upper air ridge moving towards the region on late Friday, the forecast currently calls for low precipitation chances for the region on Saturday and Sunday with exception of far western portions which may see a slight chance (~10-15%). An interesting feature seen in the latest GFS run is an upper air low within the ridge moving towards the northern CA on Sunday that could impact the area next week. Will monitor to see if other models pick up on this low in future runs. -078 && .AVIATION... IFR to LIFR conditions are expected to persist through the afternoon and evening. SN is expected to transition to RA or RA/SN mix in the late afternoon in the valley floors below 5000-5500 ft. Low clouds and mountain obscurations persist through tomorrow. Breaks in the precipitation are expected tonight as RA and SN become more sporadic. SN rates remain around 1-2"/hr, higher rates with the heaviest showers. There is a 10-30% chance for snow amounts greater than 8 inches for KRNO and 40-80% for KCXP/KMEV. For KTRK/KTVL/KMMH, there is a 10-20% chance for snow greater than 2 ft. Winds start generally light and VRB or from the east-northeast. Then late this afternoon winds become from the south and southeast with speeds 10-25 kts and gusts up to 30-40 kts at TAF sites. Wind gusts in elevations above 8 kft of the Sierra will be higher than 80 kts. LLWS and turbulence is expected across terminals due to the stronger winds aloft. Periods of valley RA/SN mix and mountain SN persist over the next few days. -Crespo && .AVALANCHE... A significant winter storm continues to impact the region bringing heavy snow and strong southerly winds to the Sierra through early Monday. * AFTERNOON UPDATES: No major changes in the forecast as the previous forecast appears to be on track. * SWE: 95+% chance of 1" SWE in 24 hours by Monday morning along the entire Sierra crest. Storm total SWE along the Sierra crest likely (80-90% chance) up to 4", 60-70% chance of SWE totals approaching 5" along and west of the Sierra crest. * SLR: With temperatures having warmed through today, snow ratios appear to have decreased to around 10:1 this afternoon and look to persist through Monday morning. * Snow Rates: For the Sierra in Mono County, likely 2-3" per hour through the storm duration, exceeding 3" per hour at times. For the Sierra from Tahoe northward, periods of 2-3" per hour possible. Still cannot rule out thunder either with a 10-20% chance. * Winds: Sustained ridge level winds up to 60+ mph out of the south this afternoon and remaining elevated into Monday morning. Gusts upwards of 120+ mph still are possible along ridgelines. -078 && .REV Watches/Warnings/Advisories... NV...Winter Weather Advisory until 4 AM PST Monday NVZ005. Winter Storm Warning until 10 AM PST Monday NVZ002. Winter Storm Warning until 10 PM PST this evening NVZ001-003. Lake Wind Advisory until 10 PM PST this evening NVZ004. CA...Winter Weather Advisory until 4 AM PST Monday CAZ070. Winter Storm Warning until 10 AM PST Monday CAZ071>073. && $$
Area Forecast Discussion
National Weather Service Tulsa OK
851 PM CST Sun Feb 4 2024 ...New UPDATE... .UPDATE... Issued at 851 PM CST Sun Feb 4 2024 Going forecast remains in good shape overall this evening, with showers tapering off across much of eastern Oklahoma and western Arkansas over the last couple of hours. Just some isolated light showers and drizzle remain possible through the rest of the evening, mainly across southeast Oklahoma as elongated upper low slowly pulls away from the area. Updated PoPs/weather grids somewhat this evening to confine chances to SE OK/W AR through midnight. Bowlan && .SHORT TERM... (Thru Tonight) Issued at 125 PM CST Sun Feb 4 2024 A rather unusual upper air pattern is in place currently over the CONUS, with a NW-SE elongated upper low pressure from OK down to the central Gulf Coast south of an upper high over the Great Lakes. Two distinct PV maxes were embedded within vort lobes at each end of the broader elongated low, one of those over OK. This lobe will drop south this afternoon and tonight, eventually merging/consolidating by tomorrow morning near the FL Gulf Coast. Periods of light rain and/or drizzle will continue until the vort lobe and its association lift shift south and east away from the area later tonight. Skies should begin to clear from north to south after midnight, though the latest HRRR indicates low clouds may try to build back into the region around sunrise Monday. Lacy && .LONG TERM... (Monday through Sunday) Issued at 125 PM CST Sun Feb 4 2024 Upper ridging to our west will slide east over the Plains this week, allowing for more tranquil and mild/warm weather. Surface ridging will keep winds light for Monday and Tuesday, and lead to the coldest night of the week on Monday night. South winds then crank up ahead of the next storm system and front Wednesday and Thursday. Fire weather conditions are likely to be elevated on Thursday afternoon, as skies clear and gusty S/SW winds develop behind the Pacific front. As has been the case for the past couple days, the model consensus (NBM) has been too aggressive with PoPs in the Thursday night and Friday time frame with this system. Most of the models continue to suggest that the front will be east of the forecast area before it encounters better moisture and forces showers and storms. For this forecast, will continue to reduce NBM PoPs to low (20-30%) end during this time frame. Another storm system is expected to move into the Plains next weekend, with model solutions varying WIDELY regarding sensible weather. One of the more reliable models suggests winter storm potential, but most do not show anything of the sort. We`ll just have to wait and see. Lacy && .AVIATION... (00Z TAFS) Issued at 527 PM CST Sun Feb 4 2024 Scattered light rain showers will continue through mid evening in association with a mid level impulse rotating around main upper low currently moving into the Gulf States. Brief IFR ceilings will be possible in the heavier showers. Conditions will generally improve tonight with lower clouds lifting. Still a limited chance (10-20 percent) that a lower stratus deck could spread back into northeast Oklahoma briefly Monday morning. Latest HRRR runs are not as aggressive with this scenario and will therefore not mention at this time. Otherwise, VFR conditions expected with light north winds during the day Monday. && .PRELIMINARY POINT TEMPS/POPS... TUL 38 56 31 61 / 20 0 0 0 FSM 41 61 33 63 / 20 0 0 0 MLC 40 59 32 63 / 30 0 0 0 BVO 33 56 27 62 / 30 0 0 0 FYV 34 58 29 62 / 30 0 0 0 BYV 35 55 30 60 / 50 0 0 0 MKO 38 56 31 60 / 20 0 0 0 MIO 34 55 28 59 / 20 0 0 0 F10 38 56 31 61 / 40 0 0 0 HHW 43 61 34 62 / 20 0 0 0 && .TSA WATCHES/WARNINGS/ADVISORIES... OK...None. AR...None. && $$ SHORT TERM...04 LONG TERM....30 AVIATION...12