Aikyam-Lab/Synoptic-Bench huggingface dataset:
High pressure aloft will move east across the Great Basin through early Wednesday. The trough feature remains disorganized with less than ideal structure, but should bring some light precipitation across northern Utah as it crosses the region.
The combination of light winds and clear skies overhead will assist in temperatures dropping to near and below freezing for much of the northern tier of the area, as well as the higher terrain of west TX and southeast NM.
Drying conditions under weak high pressure will bring mostly sunny skies today with highs in the mid to upper 60s.
1011 AM EST Tue Dec 10 2019 Gusty winds and much colder air will continue to filter into the region today in wake of a strong cold frontal passage.
Winds continue with 40-60 mph gusts over the ridges. It will also remain windy, over the higher terrain, with some gusts up to 50 mph and blowing snow over the higher passes. Winds will decrease over the higher terrain as component along winds are under 20 kts.
An upper ridge will continue to move east, out of the Central High Plains tonight with northwest flow aloft over the region. A weak upper ridge will deamplify as it moves into the forecast region through the day on Wednesday. High temperatures will be warmer, reaching the 40s and 50s in most areas.
Quiet conditions are likely during the period as weak ridging aloft transitions eastward across the Intermountain West tonight and into the Western High Plains by Wednesday afternoon, setting up a weakening northwest flow aloft throughout the region. Expect lows well down into the 20s(F) in central Kansas with temperatures closer to 30F, possibly the lower 30s(F), in extreme southwest Kansas where a southwest downslope flow should persist through the night. Prevailing southerlies will draw warmer air into warmer Kansas Wednesday, pushing H85 temperatures up around 5C.
The upper level trough is moving across Texas and showers have been diminishing. Much of the area along and north of I-35/Hwy 90 will drop below freezing. Highs Wednesday will be about 10 degrees warmer than today.
1212 PM EST Tue Dec 10 2019 Gusty winds and much colder air will continue to filter into the region today in wake of a strong cold frontal passage.
243 PM EST Tue Dec 10 2019 High pressure will continue to ridge across the area tonight as a cold front approaches the area.
218 PM CST Tue Dec 10 2019 Abnormally cold air mass remains in place as upper trough axis passes through. Although a chilly start to the day expected Wednesday morning, moderation begins as height rise and troughs moves east. The highest amounts of 2-3" are focused north of Interstate 94. Freezing rain and drizzle are possible at the tail end of this system, but any accumulations will be really light.
Dewpoints upstream are already in the teens, and dewpoints in the low 20s are in place in Nashville and northwest in the mid state. If the dry air wins out and moves through faster, those amounts will be on the high side as the heavier snow will evaporate. Cold front has cleared Middle Tennessee, with a strong NW flow bringing rapid cold advection. There is plenty of post-frontal moisture left behind, and we can expect light rain to change to light snow as temperatures cool to near freezing.
South winds will become gusty towards noon as lee trough develops.
The fog should linger through 17 or 18z before beginning to lift with the approach of a cold front. This cold front is quickly tracking to the southeast, and is now extending from Pierre Part and Donaldsonville to Mandeville and Picayune.
A arctic cold front continues to surge through the region this morning, generally moving into/through the east TN mountains at this time. Likewise, cold advection is also underway favoring a rapid non- diurnal temperature drop with freezing surface temperatures already moving into the plateau, eventually spilling eastward into the valley and Southern Appalachians. A fairly restrictive taf cycle ahead for all sites as a cold front moves through the region. CDG Chattanooga Airport, TN 32 47 30 52 39 / 80 10 0 10 60 Knoxville McGhee Tyson Airport, TN 30 44 27 50 36 / 80 10 0 10 50 Oak Ridge, TN 28 44 27 49 36 / 80 10 0 10 50 Tri Cities Airport, TN 29 40 23 48 32 / 80 10 0 10 40.
For the Treasure Valley, air temperatures will be near freezing with light snow arriving around the morning rush hour.
Issued by National Weather Service Spokane WA 1039 AM MST Tue Dec 10 2019 The strong high pressure ridge to our west will be knocked down a bit by a weakening Pacific weather system. Some northwest MT valleys could also see some light freezing drizzle early Wednesday morning.
A few clouds will be noted through the day, ranging from the scattered to broken high clouds from I-55 eastward to a few clouds around 4000 feet drifting into central IL from the northwest left over from a weak upper level trough skirting by to the north. Mostly sunny skies are expected today as the lower clouds move off to the east and high clouds remain. Temps should remain well below normal today and again tonight, but then begin to moderate back to at or above freezing tomorrow over most of the area. Then series of troughs are forecast to move through the midwest during the weekend and the first part of the new week. So, going forecast will still have chances of rain and snow with cooler temps.
Overnight lows will be in the low to mid single digits above zero. Skies should again clear by tomorrow afternoon, with afternoon highs ranging from the low teens north to around 20 across the far south.
Once the upper trof axis pushes east of the area and mixing/column drying occurs Wed morning we'll see skies gradually clear out.
It will remain cold otherwise with lows in the low to mid teens tonight and highs in the mid to upper 20s tomorrow.
High pressure building in from the southwest should bring southwest winds tomorrow, but the chilly start will mean after highs still 5-10 degrees below normal.
High clouds will gradually clear from west to east this evening as the flow turns northwesterly with the passage of a mid level trough.
Lows tonight in the low to mid 20s will then be close to climatological norms.
As winds calm down, any rain/snow left on area roads may result in some slick spots on bridges and some secondary roads. Dry air depth in the low to mid levels was much deeper than models indicated and was too much to overcome despite colder temps earlier at the surface.
855 AM PST Tue Dec 10 2019 Building high pressure over the West will bring dry, mild weather this week.
1029 AM MST Tue Dec 10 2019 Upper level analysis has large trof across the northern CONUS with ridge over the West Coast. At the surface, Arctic high pressure resides across the Northern Plains with temperatures at 3am in the single digits and teens. Accumulations will be less than half an inch across the Plains, to around an inch in the higher elevations of the northern Black Hills.
Overnight, high pressure will settle in across West Central Texas, and temperatures should fall to just below freezing with ample radiative cooling conditions. Soundings at several locations show that near-surface saturation is likely, especially with the wet ground, which could cause freezing fog to develop. We have included areas of freezing fog for much of the Concho Valley and I-10 corridor to develop late tonight, just before sunrise.
Dewpoints upstream are already in the teens, and dewpoints in the low 20s are in place in Nashville and northwest in the mid state. If the dry air wins out and moves through faster, those amounts will be on the high side as the heavier snow will evaporate.
Northerly winds are expected to remain gusty at most airports in the wake of the cold frontal passage through the afternoon and most airports near the coast and tidal lakes through tonight and Wednesday morning. The fog should linger through 17 or 18z before beginning to lift with the approach of a cold front. This cold front is quickly tracking to the southeast, and is now extending from Pierre Part and Donaldsonville to Mandeville and Picayune.
Surface cold front stretches across central Ga and southern AL at this time.
424 PM MST Tue Dec 10 2019 A shallow ridge of high pressure continues to cross over eastern Utah and western Colorado, with mid to high level clouds streaming in from the northwest. Benign weather will continue overnight tonight, with partly cloudy skies keeping overnight lows comparable to slightly warmer than experienced across the region this morning.
Depending on timing of clouds and fog temps could fall to near freezing and freezing fog possibilities do exist. The combination of light winds and clear skies overhead will assist in temperatures dropping to near and below freezing for much of the northern tier of the area, as well as the higher terrain of west TX and southeast NM.
539 PM CST Tue Dec 10 2019 High pressure centered over eastern Nebraska will drift southeast tonight and Wednesday. Models show the high flattening out into an elongated ridge stretching from east Texas northeast into Tennessee, Kentucky, and West Virginia by early Wednesday morning. A weak short wave currently over northeast Nebraska will dig southeast into Iowa tonight and will help to develop a weak warm front across Iowa and northern Illinois. Lows tonight should be similar to last night's, although we might see a little bump before sunrise as the wind turns to the south with the high moving into the lower Mississippi River. With the southerly flow continuing on Wednesday highs are expected to be 5 to 10 degrees warmer than today's in the mid 30s to mid 40s.
Ahead of an advancing cold front, the air is very close to saturation. Ascent along and ahead of the cold front is not particularly good, but good enough to support at least some shallow shower activity.
A trough will move through the area Wednesday morning which may bring some light precipitation to the Sierra and to Merced County.
A weak area of low pressure will move southeast ahead of high pressure overnight with a band snow developing mainly just north/northeast of the surface reflection. The snow will end quickly from west to east late tonight into early Wednesday morning as high pressure arrives from the north. High temperatures over northern Iowa will again be in the single digits above zero while highs over the south will be in the low 30s.
810 PM EST Tue Dec 10 2019 A cold front over the Tennessee Valley will move slowly southeast tonight and should be over the Southeastern United States by Wednesday morning. The cold front will continue to slowly shift southward on Wednesday into Northern Florida allowing for the wind flow to become southerly over South Florida. Therefore, the High Risk of Rip Currents will be allow to expire this evening.
322 PM CST Tue Dec 10 2019 Mid-afternoon GOES water vapor imagery indicated a diffluent and moisture-laden southern branch of the upper jet over the Midsouth, downstream of a progressive trof centered over west TX. This trof will lift east and deamplify this evening, phasing with a progressive northern branch longwave trof over the mid MS River valley. This elevated wedge of dry air will eventually drop into north central and then northeast MS through midevening, as temperatures cool to freezing. After mentioned in the Special Weather Statement, residual moisture on bridges will be subject to freezing, as overnight temps drop into the 20s, accompanied by light or calm winds.
Temps will be most noticeably warmer south of I-80 where a 10 degree improvement is expected. Areas north of the highway will have to settle for five extra degrees versus today.
By tomorrow, a cold front begins to sink across central FL, continuing at least MVFR cigs through the TAF period. Conditions will briefly improve tomorrow morning, before decreasing again as a cold front approaches the area.
615 PM CST Tue Dec 10 2019 High pressure will slide south of the area tonight, with southerly winds returning to southeast Kansas and the Missouri Ozarks late tonight.
624 PM EST Tue Dec 10 2019 Snow, mainly south and east of Pittsburgh, will taper off tonight behind an exiting cold front.
312 PM MST Tue Dec 10 2019 Upper ridge will migrate over Colorado the next 24 hrs, then weak wave slides east from the Great Basin into the srn Rockies by late Wed afternoon. Under mainly clear skies overnight and with only a weak and late developing surface lee trough, min temps will fall to fairly cold levels, and many high mountain valleys will drop well below zero once again. Lee slopes of the ern mountains may see downslope winds stir a little toward morning, keeping readings a few degf warmer than locations farther east. Deepening lee trough and better mixing on Wed should boost max temps back into the 50s along and east of the mountains by late afternoon, as winds ramp up and become gusty over the far sern plains.
346 PM MST Tue Dec 10 2019 Upper ridge will migrate over Colorado the next 24 hrs, then weak wave slides east from the Great Basin into the srn Rockies by late Wed afternoon. Under mainly clear skies overnight and with only a weak and late developing surface lee trough, min temps will fall to fairly cold levels, and many high mountain valleys will drop well below zero once again. Lee slopes of the ern mountains may see downslope winds stir a little toward morning, keeping readings a few degf warmer than locations farther east. Deepening lee trough and better mixing on Wed should boost max temps back into the 50s along and east of the mountains by late afternoon, as winds ramp up and become gusty over the far sern plains.
High pressure building in from the southwest should bring southwest winds tomorrow, but the chilly start will mean afternoon highs still 5-10 degrees below normal.
Will likely let the High Wind Watch for the Southern Laramie Range and foothills expire, as strong winds look less favorable there based on gradients.
Strong westerly winds at the mountain tops will downslope and keep the precipitation to a minimum with some snow in the higher elevations and west aspects tonight.
As a result, temperatures should be noticeably warmer tomorrow afternoon with highs forecast to reach the upper 40s to near 50 degrees.
341 PM MST Tue Dec 10 2019 Winds are still howling above timberline in the Front Range, but have dropped off elsewhere, and the low levels have dried enough to end the snow on the ridges. The Platte valley cold pool has sloshed around a little, keeping most of the Front Range cities a little cooler than we expected. On Wednesday, we'll have significant warming aloft, but will still be fighting the low level inversions along with the remaining snow cover. Temperatures should be 5 to 10 degrees warmer, and there will be a bigger difference between the warm areas along the foothills and south/southeast of Denver which should get into the 50s and the remaining cold pools which may still struggle to get into the 40s. There is a weak upper trough to move across the CWA Wednesday night.
519 PM EST Tue Dec 10 2019 Snow, mainly south and east of Pittsburgh, will taper off tonight behind an exiting cold front.
/issued 322 PM CST Tue Dec 10 2019/ Mid-afternoon GOES water vapor imagery indicated a diffluent and moisture-laden southern branch of the upper jet over the Midsouth, downstream of a progressive trof centered over west TX. This trof will lift east and deamplify this evening, phasing with a progressive northern branch longwave trof over the mid MS River valley. This elevated wedge of dry air will eventually drop into north central and then northeast MS through midevening, as temperatures cool to freezing. After mentioned in the Special Weather Statement, residual moisture on bridges will be subject to freezing, as overnight temps drop into the 20s, accompanied by light or calm winds.
A partial breakup of this low cloud cover is expected through early tonight. With radiational cooling and a residually moist boundary layer, areas of fog and freezing fog should develop late tonight across much of southern and central parts of West Central Texas. Overnight, high pressure will settle in across West Central Texas, and temperatures should fall to just below freezing with ample radiative cooling conditions. Soundings at several locations show that near-surface saturation is likely, especially with the wet ground, which could cause freezing fog to develop. We have included areas of freezing fog for much of the Concho Valley and I-10 corridor to develop late tonight, just before sunrise.
401 PM CST Tue Dec 10 2019 High pressure centered over eastern Nebraska will drift southeast tonight and Wednesday. Models show the high flattening out into an elongated ridge stretching from east Texas northeast into Tennessee, Kentucky, and West Virginia by early Wednesday morning. A weak short wave currently over northeast Nebraska will dig southeast into Iowa tonight and will help to develop a weak warm front across Iowa and northern Illinois. Lows tonight should be similar to last night's, although we might see a little bump before sunrise as the wind turns to the south with the high moving into the lower Mississippi River. With the southerly flow continuing on Wednesday highs are expected to be 5 to 10 degrees warmer than today's in the mid 30s to mid 40s.
906 PM EST Tue Dec 10 2019 Snow, mainly south and east of Pittsburgh, will taper off tonight behind an exiting cold front.
Chattanooga Airport, TN 29 47 29 54 / 90 10 0 10 Knoxville McGhee Tyson Airport, TN 27 44 28 51 / 90 10 0 10 Oak Ridge, TN 26 44 27 51 / 80 10 0 10 Tri Cities Airport, TN 26 40 25 48 / 100 10 0 10 TN.
226 PM MST Tue Dec 10 2019 Drying conditions under weak high pressure will bring mostly sunny skies today with highs in the mid to upper 60s.
The lower atmosphere will gradually remoisten and by daybreak may be capable of patchy stratus or light fog near KLBB and KPVW, as we have retained from the previous forecast.
A partial breakup of this low cloud cover is expected through early tonight. With radiational cooling and a residually moist boundary layer, areas of fog and freezing fog should develop late tonight across much of southern and central parts of West Central texas. Overnight, high pressure will settle in across West Central Texas, and temperatures should fall to just below freezing with ample radiative cooling conditions. Soundings at several locations show that near-surface saturation is likely, especially with the wet ground, which could cause freezing fog to develop. We have included areas of freezing fog for much of the Concho Valley and I-10 corridor to develop late tonight, just before sunrise.
329 PM MST Tue Dec 10 2019 Upper ridge will migrate over Colorado the next 24 hrs, then weak wave slides east from the Great Basin into the srn Rockies by late Wed afternoon. Under mainly clear skies overnight and with only a weak and late developing surface lee trough, min temps will fall to fairly cold levels, and many high mountain valleys will drop well below zero once again. Lee slopes of the ern mountains may see downslope winds stir a little toward morning, keeping readings a few degf warmer than locations farther east. Deepening lee trough and better mixing on Wed should boost max temps back into the 50s along and east of the mountains by late afternoon, as winds ramp up and become gusty over the far sern plains.
303 PM CST Tue Dec 10 2019 High pressure will slide south of the area tonight, with southerly winds returning to southeast Kansas and the Missouri Ozarks late tonight.
328 PM MST Tue Dec 10 2019 A shallow ridge of high pressure continues to cross over eastern Utah and western Colorado, with mid to high level clouds streaming in from the northwest. Benign weather will continue overnight tonight, with partly cloudy skies keeping overnight lows comparable to slightly warmer than experienced across the region this morning.
Issued by National Weather Service Glasgow MT 236 PM MST Tue Dec 10 2019 The overall weather pattern will be highlighted by the struggle between warmer high pressure from the southwest and colder low pressure from the north. Wednesday, a brief, warm surge from the ridge of high pressure to the south will allow high temperatures to climb through the mid to upper 30s.
508 PM CST Tue Dec 10 2019 Abnormally cold air mass remains in place as upper trough axis passes through. Although a chilly start to the day expected Wednesday morning, moderation begins as height rise and troughs moves east. The highest amounts of 2-3" are focused north of Interstate 94. Freezing rain and drizzle are possible at the tail end of this system, but any accumulations will be really light.
Arctic cold high pressure continues to be the primary impact.
156 PM PST Tue Dec 10 2019 Building high pressure over the West will bring dry, mild weather this week.
322 PM CST Tue Dec 10 2019 Arctic cold high pressure continues to be the primary impact.
452 PM MST Tue Dec 10 2019 Updated Aviation Discussion The overall weather pattern will be highlighted by the struggle between warmer high pressure from the southwest and colder low pressure from the north. Wednesday, a brief, warm surge from the ridge of high pressure to the south will allow high temperatures to climb through the mid to upper 30s.
Will likely let the High Wind Watch for the Southern Laramie Range and foothills expire, as strong winds look less favorable there based on gradients. Progged low and mid level gradients suggest a windy day for most locations, along with cooler temperatures with 700 mb temperatures near -4 Celsius.
1223 AM EST Wed Dec 11 2019 Cold front and rain showers will move across the area overnight. Dry high pressure will ridge into the area from the north Thursday.
Overnight forecast is in good shape with chilly temperatures expected under ridging conditions.
Arctic cold high pressure continues to be the primary impact. As a result 1 to 3 inches of snowfall is expected with the highest amounts along the I94 corridor. Removed threat for freezing rain/drizzle for 00Z Fri through 00Z Sat as system moves through quickly.
313 AM EST Wed Dec 11 2019 An upper trough axis will pivot east of central Kentucky this morning. Low lying areas in southern IN and the Bluegrass region are likely to dip into the lower 20s. Dry and cool weather continues into Thursday as the lower Ohio Valley remains in quasi-zonal flow aloft.
However, impacts are now occurring due to flash freezing of residual moisture on the roadways. We have already received multiple reports of icy roadways, overpasses, and bridges across north Mississippi. Temperatures will climb above freezing late Wednesday morning under sunny skies. /issued 322 PM CST Tue Dec 10 2019/ Mid-afternoon GOES water vapor imagery indicated a diffluent and moisture-laden southern branch of the upper jet over the Midsouth, downstream of a progressive trof centered over west TX. This trof will lift east and deamplify this evening, phasing with a progressive northern branch longwave trof over the mid MS River valley.
An almost vertical stacked sfc-500 low amplitude trough will work east across the Panhandles the second half of Wednesday through early Thursday morning. Along and downstream of the trough axis, south to southwesterly winds sustained over 20 kts are possible.
1038 PM MST Tue Dec 10 2019 A shallow ridge of high pressure continues to cross over eastern Utah and western Colorado, with mid to high level clouds streaming in from the northwest. Benign weather will continue overnight tonight, with partly cloudy skies keeping overnight lows comparable to slightly warmer than experienced across the region this morning. The rest of the region will experience above normal max temperatures on Wednesday (a few degrees warmer than today), as well as increasing cloud cover as the system passes.
Chance for showers and perhaps a thunderstorm or two increases during the day today into tonight as a cold front stalls out over Central Florida. /issued 810 PM EST Tue Dec 10 2019/ A cold front over the Tennessee Valley will move slowly southeast tonight and should be over the Southeastern United States by Wednesday morning. The cold front will continue to slowly shift southward on Wednesday into Northern Florida allowing for the wind flow to become southerly over South Florida. Therefore, the High Risk of Rip Currents will be allow to expire this evening.