Forecast Discussions mentioning any of "HRRR" "RAP" "RUC13" "RUC" "RR" received at GSD on 11/06/16


Area Forecast Discussion
National Weather Service Denver/Boulder CO
933 PM MDT Sat Nov 5 2016 .UPDATE... Issued at 929 PM MDT Sat Nov 5 2016 Only minor updates at this hour. Main shower band has rotated north of hour area and a large hole has developed in the clouds over northeastern Colorado. The next area of lift will be spreading northward with a slight chance of light rain along the eastern border later tonight, and an uptick in the weak shower activity over the mountains as well. Only change at this time is to acknowledge the current break. The combination of a little wind and clouds increasing again should hold temperatures near our current forecast lows. && .SHORT TERM...(This evening through Sunday) Issued at 130 PM MDT Sat Nov 5 2016 An upper low located near the Four Corners region this aftn is progged to move slowly east/northeast through Sunday. For tonight the flow aloft will continue to be southerly, then the flow aloft will weaken and become west/northwesterly on Sunday as the trough moves eastward. Weak mid level qg ascent coupled with some aftn instability has allowed for sct to nmrs rain and snow showers in the high country today, especially south of interstate 70. Overall will maintain sct pops in the mountains overnight. Not much in the way of accumulating snowfall expected at this time. Across the northeast plains, isold showers from around denver southward are progged to weaken as they move northward this aftn and evening. The latest HRRR runs continue to reflect this trend. Will keep isold pops in the grids mainly along and south of the interstate 70 corridor. The mdls continue to show low level moisture/stratus over the eastern plains tonight...and continue to keep it east of Denver Sunday morning. On Sunday, weak qg ascent will continue ahead of the upper trough axis with increasing mid level subsidence fm west to east. Will keep scattered pops in the mountains through early aftn with isold pops on the far eastern plains, should see them all decreasing in the afternoon. .LONG TERM...(Sunday night through Saturday) Issued at 130 PM MDT Sat Nov 5 2016 The potential for showers will diminish over the high country and far eastern plains Sunday night as a shortwave ridge moves in, however following close on its heals a shortwave trough will push in Monday morning. Due to the limited depth of moisture and downward QG motion, have kept out any chance of precipitation over the high country, however there may be a few flurries/sprinkles Monday morning. A cold front will push south over the plains Monday for highs to be about 5 degrees cooler. Some clouds in the morning should give way to mostly clear skies later in the day. The rest of the week and into the weekend will feature abnormally warm and dry weather as the strong upper ridge over the western states and into the Northern Rockies prevails. A weak cool push is expected Thursday to surge down the plains for a slight cool down. Otherwise temperatures will be 10 to 15 degrees warmer than average for this time of year. && .AVIATION...(For the 06Z TAFS through 06Z Sunday night) Issued at 929 PM MDT Sat Nov 5 2016 VFR conditions are expected through Sunday. There is a slight chance of ceilings lowering to 6000 feet for a few hours Sunday morning. && .BOU WATCHES/WARNINGS/ADVISORIES... None. && $$ UPDATE...Gimmestad SHORT TERM...Cooper LONG TERM...Kriederman AVIATION...Gimmestad
Area Forecast Discussion
National Weather Service Green Bay WI
1034 PM CDT SAT NOV 5 2016 Updated aviation portion for 06Z TAF issuance .SHORT TERM...Tonight and Sunday Issued at 220 PM CDT Sat Nov 5 2016 The latest RAP analysis and satellite/radar imagery show a massive high pressure system centered over the Ohio Valley. Besides just some wispy cirrus, skies are mostly clear across the region, and also upstream over the northern Mississippi Valley and Dakotas. With the surface high moving little through the end of the weekend, temps and prospects for fog are the main forecast concerns. High pressure through the column will remain across the region tonight and Sunday. The airmass within this high remains very dry, so looking at mostly clear and calm conditions over the period. These conditions will support another night of ground fog late tonight into early Sunday morning away from the lake. Because winds in the boundary layer are weaker than last night, think fog has potential to be more widespread and dense so increased wording in the forecast. Not much change to temps over the next 24 hours. Projected 925mb temps on Sunday look similar to todays, so highs should continue to top into the middle to upper 60s. .LONG TERM...Sunday Night Through Saturday Issued at 220 PM CDT Sat Nov 5 2016 Well above normal temperatures and a few opportunities for light showers will be the general rule for the upcoming extended period. A cold front will sweep through the western Great Lakes Monday night, bringing the chance for light showers late Monday across the northwest cwa, and through the rest of the area Monday night. Rain chances will be relatively low given the limited moisture available to this northern stream system, mainly in the chancy category. The push of cold air behind this system will be relatively unimpressive, with temperatures on Tuesday although they will be several degrees cooler than Monday, will still be several degrees above normal for this time of year. The next system of consequence tracks to the north on Thursday and brings a cold front through the area during this time period. The fropa itself will be dry given very limited moisture. However there will be a chance for some showers across the northern cwa on Friday behind the front as a mid level shortwave takes advantage of a favorable fetch for some lake effect moisture to make it into the column for some rain shower activity. Even with this setup rain chances will be relatively low given the lack of deep moisture available to the shortwave. Some showers are possible in northern Wisconsin on Friday as a cold front and some mid level short wave energy pass. The front will bring the coldest daytime highs that the forecast area has seen for a while. Even so, it will still be warmer than normal with highs mostly in the 45 to 50 degree range. Temperatures behind the departing cold front Friday and Saturday will be quite cool compared to recent temperatures. Despite this cooler weather temperatures will only cool to around climatological normals for this time of year. && .AVIATION...for 06Z TAF Issuance Issued at 1034 PM CDT Sat Nov 5 2016 Areas of dense ground fog are possible for a few hours around sunrise Sunday, otherwise clear skies and great flying weather is expected through Sunday night. && .GRB WATCHES/WARNINGS/ADVISORIES... NONE. && $$ SHORT TERM.....MPC LONG TERM......Kurimski AVIATION.......RDM
Area Forecast Discussion...UPDATED
National Weather Service Lubbock TX
956 PM CDT Sat Nov 5 2016 .UPDATE... At 930 pm, the forecast area was bracketed to the north by a large blob of rain moving northeast out of the far southern Panhandle and to the south by a small t-storm complex moving across the northern Permian Basin. It looks like the srn t-storm complex will move northeast through Garza County and into the southern Rolling Plains during the next few hours. Also, additional showers and a few t-storms were developing in eastern New Mexico and the western South Plains. Water vapor imagery suggests that the next shortwave is currently moving into southwest Texas and southern NM and should be spreading into our area in the next few hours. Earlier, it looked like there might be a longer lull in-between the evening round of activity and the next round early Sunday but now it appears that the large-scale ascent with this next impulse will arrive sooner rather than later. The latest HRRR runs have also trended away from a distinct separate round of storms Sunday morning and appear to be more scattershot in nature. So the details are a bit uncertain at this point but we are confident that the area will remain socked in with low stratus and areas of fog and drizzle overnight, with showers and a few t-storms roaming the area. We`ve made some minor updates to the forecast. && .PREV DISCUSSION... /issued 637 PM CDT Sat Nov 5 2016/ AVIATION... Scattered showers and thunderstorms will work across the KLBB and KPVW terminals in the next couple of hours. Otherwise, we expect low stratus and periods of light fog and/or drizzle to keep the area terminals socked in with IFR to LIFR conditions through at least 12 UTC Sunday. Another round of -TSRA is expected to move across the area Sunday morning, and there may be some lifting of ceilings and improvement in flight conditions in the wake of the storms. However, IFR to MVFR ceilings are likely to persist through the day. PREV DISCUSSION... /issued 253 PM CDT Sat Nov 5 2016/ SHORT TERM... Favorable lift continued to expand into our western zones this afternoon ahead of an upper low centered over the Four Corners. Axis of 300 mb diffluence downstream of this low extended from about Carlsbad to Vega complete with scattered to numerous showers and storms. Confidence in this activity progressing eastward over much of the CWA this evening is high as the mean trough axis shifts the diffluence more squarely overhead, but there should be some lull overnight following this first round of precip in anticipation of downglide/subsidence in the wake of the lift. Elevated CAPE is already around 500 J/kg in our SW zones where some pea hail is likely at times with storms. Outside of precip, moist upslope winds and a cooling boundary layer seem legit once again for very low stratus and areas of fog overnight. The second bout of precip should emerge in eastern NM toward 12z Sun as the base of the upper trough rotates eastward. WPC and non- NAM guidance are tending to focus more convection in the Permian Basin and southern Rolling Plains with this latter wave, so have adjusted PoPs accordingly. Steady mid-level drying unfolds west of this progressive trough axis on Sun, so PoPs over the western half of the CWA were scaled back in tune with much less QPF per WPC. This drying should translate to some erosion of stratus in our W-SW areas and milder max temps compared to our NE counties. LONG TERM... Trough axis will be transiting the area Sunday evening with ridging building in to our west on Monday and Tuesday. However, indications are some trailing energy may persist across the area or just to our south/southeast as this weekend`s weather maker makes it toward the Great Lakes. In fact, more than one solution tries to re-establish a cut-off low over Texas or northern Mexico by late week. Unfortunately, the details are widely disparate. We`ll have some degree of cloudiness for much of the extended as there does not appear to be much of a synoptic means to clear out the moisture in its entirety until perhaps next weekend. Thunderstorm activity looks as if it will persist during the evening hours likely thinning out in the eastern counties around daybreak Monday. However, some solutions do protract the precipitation potential through Monday night in a scattered fashion as the next cold front makes its way into the region Monday afternoon. Cooler and drier air will filter into the region Tue/Wed. Another cold front comes on Friday though the timing will be quite variant on the evolution of the synoptic picture. At present, the ECM is significantly divergent with its handling of the upper level pattern. All in all, a disturbed weather pattern will continue much of the week. && .LUB WATCHES/WARNINGS/ADVISORIES... None. && $$ 33
Area Forecast Discussion
National Weather Service Denver/Boulder CO
223 AM MST Sun Nov 6 2016 .SHORT TERM...(Today and tonight) Issued at 223 AM MST Sun Nov 6 2016 A weakening upper level low over northwest Colorado will continue to lift northeast today. A moist southerly flow ahead of it will increase moisture and bring showers to the eastern plains of Colorado today. Latest HRRR runs and radar trends favor the showers passing just east of the forecast area. Will have low pops for eastern areas in case showers end up a little farther west. Due to more cloud cover today, expect slightly cooler temperatures over the eastern plains. The Front Range should see similar temperatures as yesterday. For the mountains, satellite and web cameras showing areas of low clouds and fog in the mountains this morning. As the upper level low continues to lift northeast, moisture is expected to slowly decrease through the afternoon and evening. May be enough moisture and lift to produce a few light showers and will keep the isolated/scattered pops for the mountains through early evening. .LONG TERM...(Monday through Saturday) Issued at 223 AM MST Sun Nov 6 2016 A strong upper level ridge/trough blocking pattern across the continental US will likely result in few day-to-day changes on our weather. Although models do indicate slight cooling on Thursday with retrogression in the upper ridge over the Rocky Mtn region which will allow nwly flow aloft to advance a dry cold front southward across the northern and central high plains. Prior to its arrival...warming aloft will combine with abundant sunshine and southerly bndry layer flow to send the mercury above the 70 deg mark for many locales on the nern plains of CO Wednesday. It`s fortunate that wind speeds will be light on Wednesday with the unseasonably warm temperatures...low RH values and very dry fuels. Thursday and Friday temperatures should be cooler east of the mtns within the post-frontal environment...as much as 4-7 deg f cooler than the day before. Mtn and high valley locations should see little cooling. By Saturday models show the upper ridge axis shifting east back over the Rocky Mtn region leading to another warmup going into the weekend. Bottom line...the prospect for measurable precipitation...for that matter mtn snowfall...during the 2-7 day outlook period appears bleak. && .AVIATION...(For the 06Z TAFS through 06Z Sunday night) Issued at 223 AM MST Sun Nov 6 2016 VFR conditions are expected through the next 24 hours with mid and high clouds at times. Winds will remain on the light side and generally less than 15 knots. && .BOU WATCHES/WARNINGS/ADVISORIES... None. && $$ SHORT TERM...Meier LONG TERM...Baker AVIATION...Meier
Area Forecast Discussion
National Weather Service Corpus Christi TX
400 AM CST Sun Nov 6 2016 .SHORT TERM (Today through Monday)... Challenging short term forecast with a lot of bust potential. Much like the past several days...POPs continue to be the primary forecast challenge. Water vapor imagery indicates a steady stream of moisture advecting into the region from the tropical EPAC with little variation in this moisture advection expected to change during the next 36 hours. Closer to S TX...modest low level to near surface moisture advection is ongoing from the Gulf of Mexico which...combined with moisture aloft...is resulting in deep moisture values running around two standard deviations above normal for early November. This deep moisture...combined with several vort maxes advecting towards the CWA...and an increasingly potent H25 jet...should result in cloudy and potentially wet periods today through Monday. Today...a large area of moderate to heavy rainfall has developed /as of writing/ along the Middle and Northern Coastal Bend. What effect this ongoing precip has on today/s weather remains uncertain. There is a chance that some DNVA to the SW side of the precip shield may negate precip development this morning. A few CAMs have captured this ongoing precip overnight /particularly the 00z TTU Wrf and some runs of the HRRR and RAP/. The 06z NAM and to an extent the 00z ECMWF have also captured the ongoing precip. With that said...these particular guidance suites quickly diverge in regards to their handling of additional precip this morning. The TTU Wrf and NAM want to develop additional convection across primarily the eastern half of S TX this morning /as a stronger H5 vort max approaches the region from the west/ while the HRRR...RAP...and GFS indicate strengthening subsidence in wake of this early morning/s precip. This obviously presents a forecast challenge. Given the amount of moisture depth...minor diurnal warming later this morning...and approaching upper level dynamics...I feel a continuation of likely POPs can be justified for the eastern half of the CWA. Latest runs of the NARRE-TL also indicate additional development is expected this morning. So...for now...I have likely POPs for this morning /probably closer to mid morning through early afternoon/ for the Coastal Plains with categorical POPs for the northern Coastal Bend and Victoria area....with overall precip chances diminishing by mid to late afternoon. Farther west...a brief shot of light rain to scattered showers will exist this morning across the Brush Country as vort max approaches the area...but chances should diminish quickly this afternoon as the vort max begins to kick east away from the Brush Country. Max temps are strongly dependent upon amount of precip that occurs today...but should generally be cooler than Saturday /yet still humid/. Tonight...Forecast is not any easier. A strong 80kt H25 jet streak is prog by global models to nose into the region with additional vort maxes advecting towards the area. However...some of the deeper low level moisture is prog to begin to shift east which may potentially limit the amount of precip that occurs. Much of the Brush Country may very well remain dry this evening as deeper moisture is shifted eastward...with much of the eastern areas not expecting better precip chances until after midnight. With greater moisture depth prog to be over the Coastal Plains to Victoria tonight...I have good chance to likely POPs after midnight for these areas /especially across the coastal counties/. ECMWF goes bonkers with widespread precip after midnight across these areas...but attm feel it is overproducing given the rip upper level dynamics and unseasonably high moisture depth. Monday...Strong H25 jet streak remains in play but best LLVL moisture depth continues to be shifted eastward. Have carried chance POPs for the day...with highest chances across the east given deeper moisture values /when compared to the Brush Country/. Best coverage /scattered/ will likely be during the afternoon when max diurnal warming is occurring. Am only expecting isolated thunder through the short term period as instability will be primary limiting factor. However...upper level dynamics do argue for some inclusion of thunder. Locally heavy rainfall may also occur at times with stronger showers given high moisture depth...with some isolated locations possibly receiving 1 to 3 inches of rain. && .LONG TERM (Monday night through Saturday)... ECMWF and GFS Ensemble Mean were in more agreement with the short wave trough moving south through the southern Rockies Monday night forming an upper low over Chihuahua/Far West Texas by Wednesday morning. This upper low will be very slow to move out with a rex block pattern occurring with ridge to the north over the Rockies. The upper low may lift out to the northeast a bit by Saturday. A strong upper level jet will be over Mexico into south Texas Monday night into Tuesday. High moisture will continue to be over the region Monday night for scattered convection to occur. Slightly drier air will work into the region from the north as a surface trough axis moves into the coastal waters. This will diminish PoPs to slight chance over the northern counties Tuesday. This slightly drier air in the lower levels will remain over inland areas Tuesday night into Wednesday night and will keep PoPs at slight chance for inland areas while chance PoPs will persist over the coastal waters. GFS and ECMWF show another upper level jet streak moving out of Mexico into the region as the upper low sits over northern Mexico Thursday. Moisture may increase slightly by Thursday as the upper level energy moves across Thursday into Friday. Will show chance PoPs for the coastal plains Thursday through Friday. This could continue into Saturday as well. && .PRELIMINARY POINT TEMPS/POPS... Corpus Christi 82 69 83 66 80 / 70 60 40 40 30 Victoria 79 65 80 63 78 / 90 50 50 40 20 Laredo 83 68 84 66 80 / 40 20 30 30 30 Alice 83 66 83 64 80 / 60 40 30 40 30 Rockport 81 70 82 67 79 / 80 60 50 40 30 Cotulla 80 66 82 64 79 / 40 30 30 40 20 Kingsville 83 68 84 65 80 / 60 50 40 40 30 Navy Corpus 82 71 83 68 78 / 70 60 40 40 40 && .CRP WATCHES/WARNINGS/ADVISORIES... TX...None. GM...None. && $$ RH/79...SHORT TERM TMT/89...LONG TERM
Area Forecast Discussion
National Weather Service Grand Rapids MI
229 AM EST Sun Nov 6 2016 LATEST UPDATE... Synopsis/Short Term/Long Term/Marine .SYNOPSIS... Issued at 229 AM EST Sun Nov 6 2016 While a touch usual for the early November, highs will continue to be in the mid to upper 60s today and Monday with mostly sunny skies both days. Areas of fog this morning will burn off during the mid to late morning. Some fog is expected Sunday night into Monday morning too. A cold front will cross the area on Tuesday and bring the chance of showers to the area but what showers there will be are expected to be light and mostly during the mid morning hours. This cold front will bring temperatures closer to normal for Wed and Thursday. A significantly stronger cold front will come through the area by Friday morning bringing a few more showers but more seasonably cooler temperatures. In fact it may get cold enough that we may see snow showers or mixed rain and snow showers Friday night. && .SHORT TERM...(Today through Tuesday) Issued at 229 AM EST Sun Nov 6 2016 There are two forecast concerns early this morning. First it the threat for dense fog this morning around sunrise then there is the issue of showers Tuesday morning with the cold front. First the fog issue, the HRRR, RAP model and NAM like the idea of dense fog by sunrise north of I-96 this morning. At this point the area of dense fog does not seem extensive enough for an advisory to be issued. As for the cold front and the threat of showers, it surely seems possible. The precipitable water surges to near 1 inches (well above normal for this time of year), just ahead of the cold front. The 1000/850 moisture transport vectors look good for showers Tuesday morning too. The only real issue is the best dynamics seems to be farther north. So for now I will go along with the chance (30 pct) for showers Tuesday morning but my guess would be we will be increasing that to likely by Tuesday morning. One other issue is the high temperatures have been warmer than the models have been forecasting and given the sunshine and upper ridging, I have no reason to believe today or Monday should be any cooler than Saturday so I increased the highs around 3 degrees. .LONG TERM...(Tuesday night through Saturday) Issued at 229 AM EST Sun Nov 6 2016 Fairly quiet weather is expected during the long term. High pressure will build into the Great Lakes Tuesday night behind the departing cold front. We`ll see quite a bit of sunshine Wednesday and Thursday. Winds will increase late Thursday as a clipper moves across the Straits and Georgian Bay. A cold front front will move south across Lower Michigan behind the clipper and the medium range models are painting some pcpn late Friday night and early Saturday morning. Given the cold temps in place we included a slight chance of mixed rain/snow for the eastern cwa during this time. Chances are pretty though, given the track of the clipper well north of the cwa. Temperatures Friday will top out around 50 and will only reach the mid 40s Saturday. && .AVIATION...(For the 06Z TAFS through 06Z Sunday night) Issued at 139 AM EDT Sun Nov 6 2016 Look for vsbys to fall to a quarter mile or less through 8am at MKG and a half mile at GRR, AZO, BTL and around 3sm at LAN/JXN. Conditons will improve as the morning progresses. Another round of dense fog is possible again tonight. && .MARINE... Issued at 229 AM EST Sun Nov 6 2016 Light winds will prevail till the cold front moves into the area Tuesday. We may need a SCA then. The fog over the near shore does not seem extensive enough to issue a headline this morning but we will continue to monitor this. && .HYDROLOGY... Issued at 1155 AM EDT Sat Nov 5 2016 The Maple River at Maple Rapids is the only site affected by an advisory. Most river sites continue to rapidly improve with mostly dry weather slated over the next week. The only question with regards to rainfall is late Monday night into the early portion of Tuesday. This will be associated with a quick moving cold front and will likely be less than one-tenth of an inch. No additional flooding is forecast. && .GRR WATCHES/WARNINGS/ADVISORIES... MI...None. LM...None. && $$ SYNOPSIS...WDM SHORT TERM...WDM LONG TERM...99 AVIATION...04 HYDROLOGY...JAM MARINE...WDM
Area Forecast Discussion...UPDATED
National Weather Service Corpus Christi TX
541 AM CST Sun Nov 6 2016 .DISCUSSION...Update for 12z Aviation. && .AVIATION...Precip chances to be primary WX impact to area flights. Xpctng sct to numerous SHRA thru the day across primarily KCRP to KVCT. Timing of precip is uncertain...but best coverage currently xpctd to be this mrng thru early/mid aftn. Less coverage xpctd at KALI but still enough for VCSH...with only brief period of light mrng precip /but also low CIGs/ possible at KLRD. Elsewhere...MVFR CIGs possible this mrng before returning to VFR this aftn...with additional MVFR CIGs and MVFR/IFR VSBYs under heaviest precip. Thunderstorms possible..but should be isolated given lack of instability. Additional precip may redvlp late in the TAF period along the coast and near KCRP. Weak Erly sfc winds becmg more ESErly around 10kts. && .PREVIOUS DISCUSSION... /Issued 400 AM CST Sun Nov 6 2016/ SHORT TERM (Today through Monday)... Challenging short term forecast with a lot of bust potential. Much like the past several days...POPs continue to be the primary forecast challenge. Water vapor imagery indicates a steady stream of moisture advecting into the region from the tropical EPAC with little variation in this moisture advection expected to change during the next 36 hours. Closer to S TX...modest low level to near surface moisture advection is ongoing from the Gulf of Mexico which...combined with moisture aloft...is resulting in deep moisture values running around two standard deviations above normal for early November. This deep moisture...combined with several vort maxes advecting towards the CWA...and an increasingly potent H25 jet...should result in cloudy and potentially wet periods today through Monday. Today...a large area of moderate to heavy rainfall has developed /as of writing/ along the Middle and Northern Coastal Bend. What effect this ongoing precip has on today/s weather remains uncertain. There is a chance that some DNVA to the SW side of the precip shield may negate precip development this morning. A few CAMs have captured this ongoing precip overnight /particularly the 00z TTU Wrf and some runs of the HRRR and RAP/. The 06z NAM and to an extent the 00z ECMWF have also captured the ongoing precip. With that said...these particular guidance suites quickly diverge in regards to their handling of additional precip this morning. The TTU Wrf and NAM want to develop additional convection across primarily the eastern half of S TX this morning /as a stronger H5 vort max approaches the region from the west/ while the HRRR...RAP...and GFS indicate strengthening subsidence in wake of this early morning/s precip. This obviously presents a forecast challenge. Given the amount of moisture depth...minor diurnal warming later this morning...and approaching upper level dynamics...I feel a continuation of likely POPs can be justified for the eastern half of the CWA. Latest runs of the NARRE-TL also indicate additional development is expected this morning. So...for now...I have likely POPs for this morning /probably closer to mid morning through early afternoon/ for the Coastal Plains with categorical POPs for the northern Coastal Bend and Victoria area....with overall precip chances diminishing by mid to late afternoon. Farther west...a brief shot of light rain to scattered showers will exist this morning across the Brush Country as vort max approaches the area...but chances should diminish quickly this afternoon as the vort max begins to kick east away from the Brush Country. Max temps are strongly dependent upon amount of precip that occurs today...but should generally be cooler than Saturday /yet still humid/. Tonight...Forecast is not any easier. A strong 80kt H25 jet streak is prog by global models to nose into the region with additional vort maxes advecting towards the area. However...some of the deeper low level moisture is prog to begin to shift east which may potentially limit the amount of precip that occurs. Much of the Brush Country may very well remain dry this evening as deeper moisture is shifted eastward...with much of the eastern areas not expecting better precip chances until after midnight. With greater moisture depth prog to be over the Coastal Plains to Victoria tonight...I have good chance to likely POPs after midnight for these areas /especially across the coastal counties/. ECMWF goes bonkers with widespread precip after midnight across these areas...but attm feel it is overproducing given the rip upper level dynamics and unseasonably high moisture depth. Monday...Strong H25 jet streak remains in play but best LLVL moisture depth continues to be shifted eastward. Have carried chance POPs for the day...with highest chances across the east given deeper moisture values /when compared to the Brush Country/. Best coverage /scattered/ will likely be during the afternoon when max diurnal warming is occurring. Am only expecting isolated thunder through the short term period as instability will be primary limiting factor. However...upper level dynamics do argue for some inclusion of thunder. Locally heavy rainfall may also occur at times with stronger showers given high moisture depth...with some isolated locations possibly receiving 1 to 3 inches of rain. LONG TERM (Monday night through Saturday)... ECMWF and GFS Ensemble Mean were in more agreement with the short wave trough moving south through the southern Rockies Monday night forming an upper low over Chihuahua/Far West Texas by Wednesday morning. This upper low will be very slow to move out with a rex block pattern occurring with ridge to the north over the Rockies. The upper low may lift out to the northeast a bit by Saturday. A strong upper level jet will be over Mexico into south Texas Monday night into Tuesday. High moisture will continue to be over the region Monday night for scattered convection to occur. Slightly drier air will work into the region from the north as a surface trough axis moves into the coastal waters. This will diminish PoPs to slight chance over the northern counties Tuesday. This slightly drier air in the lower levels will remain over inland areas Tuesday night into Wednesday night and will keep PoPs at slight chance for inland areas while chance PoPs will persist over the coastal waters. GFS and ECMWF show another upper level jet streak moving out of Mexico into the region as the upper low sits over northern Mexico Thursday. Moisture may increase slightly by Thursday as the upper level energy moves across Thursday into Friday. Will show chance PoPs for the coastal plains Thursday through Friday. This could continue into Saturday as well. && .PRELIMINARY POINT TEMPS/POPS... Corpus Christi 82 69 83 66 80 / 70 60 40 40 30 Victoria 79 65 80 63 78 / 90 50 50 40 20 Laredo 83 68 84 66 80 / 40 20 30 30 30 Alice 83 66 83 64 80 / 60 40 30 40 30 Rockport 81 70 82 67 79 / 80 60 50 40 30 Cotulla 80 66 82 64 79 / 40 30 30 40 20 Kingsville 83 68 84 65 80 / 60 50 40 40 30 Navy Corpus 82 71 83 68 78 / 70 60 40 40 40 && .CRP WATCHES/WARNINGS/ADVISORIES... TX...None. GM...None. && $$ RH/79...AVIATION
Area Forecast Discussion
National Weather Service Grand Rapids MI
745 AM EST Sun Nov 6 2016 LATEST UPDATE... Marine .SYNOPSIS... Issued at 229 AM EST Sun Nov 6 2016 While a touch usual for the early November, highs will continue to be in the mid to upper 60s today and Monday with mostly sunny skies both days. Areas of fog this morning will burn off during the mid to late morning. Some fog is expected Sunday night into Monday morning too. A cold front will cross the area on Tuesday and bring the chance of showers to the area but what showers there will be are expected to be light and mostly during the mid morning hours. This cold front will bring temperatures closer to normal for Wed and Thursday. A significantly stronger cold front will come through the area by Friday morning bringing a few more showers but more seasonably cooler temperatures. In fact it may get cold enough that we may see snow showers or mixed rain and snow showers Friday night. && .SHORT TERM...(Today through Tuesday) Issued at 229 AM EST Sun Nov 6 2016 There are two forecast concerns early this morning. First it the threat for dense fog this morning around sunrise then there is the issue of showers Tuesday morning with the cold front. First the fog issue, the HRRR, RAP model and NAM like the idea of dense fog by sunrise north of I-96 this morning. At this point the area of dense fog does not seem extensive enough for an advisory to be issued. As for the cold front and the threat of showers, it surely seems possible. The precipitable water surges to near 1 inches (well above normal for this time of year), just ahead of the cold front. The 1000/850 moisture transport vectors look good for showers Tuesday morning too. The only real issue is the best dynamics seems to be farther north. So for now I will go along with the chance (30 pct) for showers Tuesday morning but my guess would be we will be increasing that to likely by Tuesday morning. One other issue is the high temperatures have been warmer than the models have been forecasting and given the sunshine and upper ridging, I have no reason to believe today or Monday should be any cooler than Saturday so I increased the highs around 3 degrees. .LONG TERM...(Tuesday night through Saturday) Issued at 229 AM EST Sun Nov 6 2016 Fairly quiet weather is expected during the long term. High pressure will build into the Great Lakes Tuesday night behind the departing cold front. We`ll see quite a bit of sunshine Wednesday and Thursday. Winds will increase late Thursday as a clipper moves across the Straits and Georgian Bay. A cold front front will move south across Lower Michigan behind the clipper and the medium range models are painting some pcpn late Friday night and early Saturday morning. Given the cold temps in place we included a slight chance of mixed rain/snow for the eastern cwa during this time. Chances are pretty though, given the track of the clipper well north of the cwa. Temperatures Friday will top out around 50 and will only reach the mid 40s Saturday. && .AVIATION...(For the 12Z TAFS through 12Z Monday morning) Issued at 646 AM EST Sun Nov 6 2016 Solid LOW IFR at MKG most of the night and into the early morning hours, this will lift to nearly clear skies by noon but it does look like more dense fog will develop (as seen on RAP and NAM bufkit time sections). Elsewhere and otherwise the fog has not been nearly as dense or persistent. The RAP and HRRR both show the fog becoming more extensive once the sun comes up and starts mixing the air (more moist just above the ground). I would think the densest fog would be in the 13z to 15z time frame. Given we are now in mid November and with such a low sun angle it may take till late morning to mix this fog out. Skies should be clear this afternoon. Fog is expected to redevelop at MKG but the other TAF sites, due to stronger boundary layer winds should only see mist (3-5sm br) overnight. && .MARINE... Issued at 745 AM EST Sun Nov 6 2016 I issued a marine dense fog advisory till noon from Grand Haven to whitehall till noon. This idea is based on the RAP and HRRR fog forecast which has been doing great over the past few hours and this suggests the fog will last until nearly noon before it moves off shore. The fog may come back tonight, that will have to be watched. && .HYDROLOGY... Issued at 1155 AM EDT Sat Nov 5 2016 The Maple River at Maple Rapids is the only site affected by an advisory. Most river sites continue to rapidly improve with mostly dry weather slated over the next week. The only question with regards to rainfall is late Monday night into the early portion of Tuesday. This will be associated with a quick moving cold front and will likely be less than one-tenth of an inch. No additional flooding is forecast. && .GRR WATCHES/WARNINGS/ADVISORIES... MI...None. LM...Dense Fog Advisory until noon EST today for LMZ846>848. && $$ SYNOPSIS...WDM SHORT TERM...WDM LONG TERM...99 AVIATION...WDM HYDROLOGY...JAM MARINE...WDM
Area Forecast Discussion
National Weather Service Houston/Galveston TX
911 AM CST Sun Nov 6 2016 .UPDATE... Shaved down precip chances a bit for today for the northeastern half of the area as the first wave of rain appears to have succumbed to lingering dry air as it moved northeast of the Matagorda Bay area. However, this should only necessitate a small reduction in PoPs, as the environment still does not look to be best over SE Texas until much later today. The HRRR and RAP are somewhat worrying, as it hits the area with a batch of rain not present at the current forecast hour and then goes relatively dry afterwards. However, the 12Z NAM still provides rain, as does the 06Z TTU WRF, and even the previously dry NCAR WRF ensemble bring in a shield of rain late this afternoon into tonight. So now we wait for rain and what dry air is left to do battle again... Luchs && .PREV DISCUSSION... /ISSUED 549 AM CST Sun Nov 6 2016/ AVIATION... VFR conditions are expected for most of today and this evening. Confidence regarding the timing and location of showers and thunderstorms is moderate at best. There was an area of showers with embedded thunderstorms moving up the coast from Matagorda Bay. The models differed on the timing and location to where these storms will end up later today. A consensus of the shorter range high resolution models means better chances for this morning and afternoon. The global models were showing better chances tonight and Monday. Given the dynamics of the upper level system approaching the state from the west, but taking in mind the short range models, introduced chances for showers this morning and kept best chances tonight. Confidence for the onset of MVFR or lower conditions tonight is low to moderate. There was a difference between models with the NAM the more aggressive and the GFS keeping mainly VFR conditions in place through the night. Went with a blend of the models and guidance. 40 PREV DISCUSSION... /ISSUED 308 AM CST Sun Nov 6 2016/ DISCUSSION... At 1 AM, surface high pressure over the Ohio Valley was ridging into SE TX. A deep upper level low was located over the Four Corners region and the flow aloft over Texas was becoming increasingly divergent. At 850 mb, a strong high pressure system was located over Missouri. A strong surge of moisture was oriented NW to SE across the state from about Amarillo to Corpus Christi. A narrow ribbon of 12-14 C dew pts extended from CRP to BRO and out over the Gulf. The upper low will gradually move east today and tonight and showers and thunderstorms are expected to become more numerous today as the flow aloft becomes more diffluent and moisture levels continue to climb. Radar is showing an expanding area of shra/tsra over the Middle Texas Coast and this area of precip will be working it`s way north this morning. Tapered PoPs with the higher values to the SW and lower to NE today as the upper low edges eastward. The upper low gets closer tonight and jet dynamics begin to kick in with a nice split in the 300 mb winds and the approach of an 80 kt speed max. SE TX will lie a LFQ tonight through Monday so would expect a continuation of showers and thunderstorms. Some of the rainfall totals between today and Monday evening could be locally heavy. That said, the GFS fcst soundings show a bit more dry air in the soundings and PW values are now progged to remain about 1.60 inches instead of the 1.90 inches progged yesterday. Will maintain the likely PoPs for tonight and Monday and have leaned toward the wetter ECMWF/GEM. The GFS and ECMWF differ rather significantly Tuesday and beyond as the GFS shears the upper low out leaving a weak and poorly defined weakness over W TX. The ECMWF also leaves some energy to the southwest but it is stronger with the feature. The ECMWF would suggest a continuation of the precip as isentropic upglide begins. The GFS flow aloft is more zonal and isentropic upglide would be minimal. FWIW, the GEM favors the ECMWF upper pattern and the GFS precip pattern. Not much confidence going forward but feel that with a weakness to our west and NE sfc winds, there should be some isentropic upglide component and will lean toward the wetter ECMWF. Temps will trend cooler during the second half of the week due to NE sfc winds and the added cloud cover. Another strong disturbance will approach the area late Fri or Sat and bring SE TX another chance of precip with temps trending much cooler for next Sunday in the wake of this feature. 43 MARINE... Chances for showers and thunderstorms will become likely later today and tonight which will then persist through Monday. Main impacts will be gusty winds in and near any storms that develop. Easterly are expected on Monday with northeasterly developing for Tuesday. For tonight/early Monday morning and again Monday night/early Tuesday morning the winds will help tide levels to reach to about 1 foot above normal. This will mean that the higher than normal tides may affect portions of the Bolivar Peninsula during the times of high tides. 40 && .PRELIMINARY POINT TEMPS/POPS... College Station (CLL) 76 64 74 60 73 / 50 70 60 40 30 Houston (IAH) 79 66 75 62 76 / 60 70 60 40 40 Galveston (GLS) 78 71 76 68 75 / 60 70 60 50 40 && .HGX WATCHES/WARNINGS/ADVISORIES... TX...NONE. GM...NONE. && $$ Discussion...25
Area Forecast Discussion
National Weather Service San Francisco Bay Area
423 AM PST Sun Nov 6 2016 .SYNOPSIS...A dissipating weather system may produce local light rain this morning, mainly in the North Bay. Otherwise expect dry and slightly cooler weather. High pressure will build across California starting on Monday, and result in dry weather along with warmer than normal temperatures through at least Thursday. Rain chances return by late Friday. && .DISCUSSION...As of 2:40 AM PST Sunday...A weak front mostly dissipated before making its way into the North Bay last evening. Only a few locations in Sonoma and Marin counties picked up measurable rain. Where rain has fallen, amounts have been less than a tenth of an inch. The WRF and HRRR models continue to show scattered light precipitation across the North Bay through at least mid morning. Given that the front has already dissipated, would be inclined to ignore these models and take rain chances out of the forecast this morning. However, satellite shows an area of colder cloud tops offshore associated with a weak shortwave trough approaching the North Bay. So will keep slight rain chances in the North Bay through this morning, Any rain that does fall today is expected to be very light. Low level moisture is forecast to linger over the area today and clouds will probably be slow to clear. Thus, expect temperatures today to be cooler, especially across the northern half of the forecast area. An upper level ridge is forecast to build over the southwestern United States by Monday afternoon. Subsidence under this ridge will result in more sun and warmer temperatures on Monday. The ridge is then expected to maintain dry and mild weather across our area through at least Thursday. The medium range models agree that the ridge may weaken enough late in the week to allow a Pacific weather system to produce light rain across the northern part of our area sometime between Friday afternoon and Saturday morning. Otherwise the general idea from the longer range models is for a persistent upper ridge over or near California through the middle of the month and thus continued dry conditions. && .AVIATION...as of 4:15 AM PDT Sunday...A weak front dissipating over the area has been bringing some light showers to the far reaches of north bay this morning, otherwise conditions have remained dry across the area with mainly vfr to mvfr at the regions airports. Mid level moisture may cloud in the region through the day, so have kept some cigs in but mainly above 3kft for the afternoon. This should clear out by early evening allowing for vfr overnight. Some residual moisture may cause a few pockets of slightly reduced vsby. Vicinity of KSFO...VFR/MVFR today due to cigs. Cigs are expected to lift through the late morning and into the afternoon. Light winds through much of the day. SFO Bridge Approach...Similar to KSFO. Monterey Bay Terminals...VFR/MVFR today due to cigs. && .BEACHES...as of 4:15 AM PDT Sunday...High surf advisory remains in place and has been nudged to 9 am for expiration. Swell seems to have peaked this morning in the 15 to 17 ft range at 16 seconds with current buoy obs showing 13 to 15 ft at 15 seconds. This is a bit larger and later than models had forecast. Thus the reason for the nudge on expiration. Swell heights of this range will cause breakers to reach upwards of 20 ft. The highest waves will be at beaches with the greatest west-northwest exposure. Conditions will begin to subside this afternoon then bottom out on Monday. However, due to an active storm track across the North Pacific, we are expecting another swell train to reach the coast Tuesday night into Wednesday. Current data indicates that the swell could peak around 12 to 15 feet at 17 seconds. We will be watching this over the coming days to see how it shapes up. Never turn your back on the ocean. During high surf events, remain farther back from the waters edge than you would normally. && .MARINE...as of 03:45 AM PST Sunday...Winds will remain light to moderate across the central california coastal waters through midweek. a dissipating front will today will give way to weak high pressure on monday. an approaching front will turn winds southerly by midweek...but are expected to be light as the front pulls off into the pacific northwest. large swell will continue in the coastal waters through today then begin diminishing this afternoon. large swell will again move through the coastal waters late tuesday through wednesday. && .BEACHES... && .MTR WATCHES/WARNINGS/ADVISORIES... .Tday...High Surf Advisory...Entire Coast SCA...Mry Bay until 9 AM SCA...Pt Arena to Pt Reyes 0-10 nm until 9 AM SCA...Pt Reyes to Pigeon Pt 0-10 nm until 9 AM SCA...Pigeon Pt to Pt Pinos 0-10 nm until 9 AM SCA...Pt Pinos to Pt Piedras Blancas 0-10 nm until 9 AM SCA...Pt Arena to Pigeon Pt 10-60 nm until 9 AM SCA...Pigeon Pt to Pt Piedras Blancas 10-60 nm until 9 AM SCA...Rough Bar Advisory for SF Bar && $$ PUBLIC FORECAST: Dykema AVIATION: BFG MARINE: BFG Visit us at www.weather.gov/sanfrancisco Follow us on Facebook and twitter at: www.Facebook.com/nwsbayarea www.twitter.com/nwsbayarea
Area Forecast Discussion
National Weather Service Charleston SC
246 PM EST Sun Nov 6 2016 .SYNOPSIS... High pressure will persist across the region into the middle of the week. A weak cold front will then move through Wednesday night with a stronger cold front potentially moving through over the weekend. && .NEAR TERM /THROUGH TONIGHT/... High pressure will remain anchored to the region tonight. A few sprinkles can not be completely ruled out along parts of coastal McIntosh County for the remainder of the afternoon, but the dry sub-cloud layer noted on RAP soundings at Sapelo Island suggest the risk for measurable rainfall is too small to justify a mentionable pop. Thick stratocumulus affecting the Georgia coast will dissipate this evening, leaving only thin cirrus traversing Southeast South Carolina and Southeast Georgia overnight. Lows will range from the lower 40s well inland to the upper 50s/near 60 along at the beaches. && .SHORT TERM /MONDAY THROUGH WEDNESDAY/... Monday and Monday night: A strong and deep mid/upper level ridge will remain in place across the eastern CONUS through Monday night. Surface high pressure over New England will slip southward into the Carolinas and deep dry air will prevail resulting in a rain free forecast. Skies will generally be clear, with mainly thing high clouds streaming through. Temperatures won`t change much, with daytime highs ranging in the low to mid 70s. Overnight, look for lows in the low 40s inland to around 50 at the coast. Tuesday through Wednesday: The upper ridge will de-amplify and weaken in response to a vigorous mid/upper level trough digging across the Upper Midwest and the Great Lakes region. High pressure at the surface will weaken and become suppressed to the south through Wednesday morning, and a weak cold front will begin to push through during the day. Such a scenario is generally supported by the majority of models, though the GFS shows a much stronger upper wave that digs to a much lower latitude on Wednesday. If this were to occur, there would be an argument for rain chances on Wednesday. However, the forecast favors the model consensus and is rain free. Clouds will increase on Wednesday with the approach of the aforementioned trough. Temperatures through mid week are expected to be at or a few degrees below climo. && .LONG TERM /WEDNESDAY NIGHT THROUGH SATURDAY/... A weak/dry cold front is expected to move through the area Wednesday night followed by high pressure until another stronger cold front likely moves through at some point from Friday night through Saturday night. Again moisture appears limited and thus rain chances should be very low. Temperatures will be on a warming trend through Friday ahead of the front and then will be on a cooling trend behind the front, probably dropping slightly below normal. && .AVIATION /19Z SUNDAY THROUGH FRIDAY/... VFR through 07/18z. Extended Aviation Outlook: High confidence in mainly VFR conditions. && .MARINE... Data suggest seas have dropped below 6 ft over the Georgia offshore leg so the Small Craft Advisory will be cancelled. Tonight: Elevated winds will persist tonight within a tightening pressure gradient induced by high pressure building south. Winds of 15-20 kt will prevail for much of the local marine area outside of the Charleston Harbor with seas 2-4 ft nearshore waters and 4-5 ft offshore waters. Monday through Friday: High pressure inland will continue to drive persistent northeast flow across the local waters through Tuesday. In fact, winds will be solidly in the 15-20 knot range Monday and part of Monday night, and could become marginally supportive of a Small Craft Advisory for portions of the waters. The gradient will relax thereafter and a cold front will push through Wednesday night. Winds will turn northerly and then become more westerly through the end of the week. Seas will be at their highest Monday and Monday night, ranging 3-5 feet out to 20 nm and 5-7 feet beyond. && .EQUIPMENT... The KCLX radar will remain down until further notice due to a hardware problem. Actions are being taken to restore service as soon as possible, but a restoration time is unknown at this time. && .CHS WATCHES/WARNINGS/ADVISORIES... GA...None. SC...None. MARINE...None. && $$
Forecast discussion for routine afternoon forecast issuance

.SHORT TERM...Tonight and Monday Issued at 249 PM CST Sun Nov 6 2016 The latest RAP analysis and satellite/radar imagery show a large high pressure system stretching from Quebec to the southeast Gulf Coast early this afternoon. This high continues to be the main influence on our weather, with mainly sunny skies in such a dry airmass. Many locations are approaching or surpassing their record highs for the day. Looking upstream, clouds are increasing this afternoon ahead of the next cold front, which is now entering the western Dakotas. Clouds and temps are the main forecast concern until this front arrives on Monday night. The sprawling high pressure system will be moving to the east coast at the same time as a weak cold front moves across the northern Plains and into the northern Mississippi Valley by Monday afternoon. With the high moving away, the pressure gradient will be tightening somewhat, causing boundary layer winds to be higher than the past couple nights. This should limit fog potential tonight and guidance only gives a small chance near Lake Michigan. Otherwise, should see another clear and quiet night. Mid and high clouds will be on the increase across the region ahead of the approaching front. Though progged soundings show that the atmosphere struggles to saturate below 15 kft, moisture does start to increase around 10 kft late in the afternoon. So think could see a few sprinkles approach western Vilas and Oneida counties after 21z. 925mb temps are a few degrees colder in the nam/ecmwf tomorrow afternoon. With the increase in cloud cover, think highs in the low to mid 60s sounds about right. .LONG TERM...Monday Night Through Sunday Issued at 249 PM CST Sun Nov 6 2016 A cold front will bring showers to the area as it tracks through the western Great Lakes on Monday night. The cold front will user in a cooler airmass for Tuesday, however temperatures will still be well above normal for this time of year. High pressure building in across the Great Lakes will bring dry weather much of the work week, as temperatures continue to slowly climb as the week progresses. Another cold front will track through the western Great Lakes late on Thursday into Thursday night. Despite the passage of the front, rain chances will not arrive until Friday when a shortwave tracks through the region and takes advantage of deeper moisture afforded by lake moisture. Even then rain chances will be low and limited to the north closer to the lake moisture itself. This cold front will bring an even colder airmass to the region Friday and Saturday as temperatures return to near normal levels as high temperatures are limited to the 40s. This dip in temperatures will be short lived, as temperatures rebound back to above normal by Sunday on the backside of a retreating high pressure system. && .AVIATION...for 18Z TAF Issuance Issued at 1129 AM CST Sun Nov 6 2016 High pressure will finally depart the region to the east coast during the taf period. Skies will remain clear for the region until late tonight into Monday when high clouds invade the region from the west ahead of the next front. This front will bring the next chance of precip, but not until Monday night. With stronger winds arriving above the inversion tonight, the threat of fog will be low. && .GRB WATCHES/WARNINGS/ADVISORIES... NONE. && $$ SHORT TERM.....MPC LONG TERM......Kurimski AVIATION.......MPC