Aikyam-Lab/Synoptic-Bench huggingface dataset:
Short wave energy and a weak surface reflection traversing a cold front over the northern Gulf will lead to gradual moistening of the low and mid levels. High pressure weakens in response to the next approaching weather system over the northern Gulf. Hazardous boating conditions will spread from north to south through Mon night as a cold front settles through the waters. Will have to watch for even further tightening on Wed as low pressure develops near the northern Bahamas and deepens rapidly.
Also emphasizing snow more than freezing drizzle over the southern Rolling Plains at least. Cold front on the verge of passing Lubbock at this moment, and will sweep southward before daybreak. The drier air also will erode and lift the low cloud deck, but it may be difficult to totally eliminate these clouds before dark this evening. Initial 4-8 millibar/three hour surface pressure rises early this morning will ease, but as 1050 millibar ridge noses southward to our east, at least low-end breezy conditions will remain through the day and overnight.
850 mb temps continue to hover in the lower -20s into Monday morning, "warming" toward -10 C later on Tue.
This stratus deck was yielding to some fog over the higher terrain where the Laramie and Cheyenne Airport was near one quarter of a mile. We have pondering on issuing a dense fog advisory for the higher terrain through 15z, but the latest web cams along I-80 was only showing a couple places where the visibility was near a quarter of a mile. However, it will be warmer than previous days. The rest of the week should be a bit milder as the upper level ridge moves over the region.
Surface analysis reveals a cold front is located over North-Central Florida. A low pressure system associated with the front, will move from the Central Gulf Coast to the Southeastern Gulf by 01/06z. This feature (combined with a massive high over the Central CONUS) will then aide the cold front's shift southward toward the Florida Keys. Until then, enjoy the 'calm before the storm' with gentle to moderate breezes, extremely low rain chances, and comfortable temperatures in the low 70s. Dew points will begin to tick upwards this afternoon and overnight as we enter the 'warm sector' immediately ahead of the cold front.
Models continue to show the coldest air impacting the area tonight into Monday morning as light north to northeast surface winds continue to downstream of the Northern Plains cold core high pressure. With north winds and broad weak cold advection continuing, the models suggest highs will not exceed the single digits for most of the central Kansas counties, while approaching mid teens in the higher elevation far southwest locations like Liberal and Elkhart. upper ridging and northwest flow across the Central Plains, will continue as a large arctic high pressure settles over the Missouri valley by Monday afternoon.
High pressure aloft will gradually strengthen across the region through the middle of the week.
Thermal trof finally comes through on Monday, with max temps expected to be the coldest since February of 2015. Bitter cold conditions will continue Monday night as the Arctic high center continues to settle into the Lower Missouri Valley, with a ridge axis extending east across Kentucky.
Otherwise, biggest challenge is evolution of the sky cover given persistent low clouds in much of the valley with the low level moisture trapped under the inversion. Chattanooga Airport, TN 35 16 27 12 / 0 0 0 0 Knoxville McGhee Tyson Airport, TN 30 14 23 6 / 0 0 0 0 Oak Ridge, TN 30 14 23 6 / 0 0 0 0 Tri Cities Airport, TN 26 10 20 3 / 0 0 0 0 NC.
Currently, north-northwest flow aloft with the core of the Arctic high pressure building into western North Dakota early this morning. Long wave trough persists across eastern North America with Arctic high pressure slowing oozing south-southeastward across the Dakotas today and tonight.
High pressure will remain dominant across the region through the upcoming week. Temperatures will continue to run above normal with highs mostly in the 70s across the lower deserts. Upper level ridging will remain over the Southwestern U.
Latest guidance shows arctic cold front moving southward across the area Tonight. guidance suggests surface temperatures will stay above freezing even in southern GA. temps could drop to freezing by dawn interior se GA before drizzle ends. suggesting at least some potential for freezing drizzle before ending. Arctic cold front will move across the waters Tonight. With large high pressure slowly building toward the area.
349 AM MST Sun Dec 31 2017 Upper level analysis has broad trof across much of the CONUS, with ridging just off the West Coast. At the surface, arctic high pressure has settled across the Northern Plains, with a stationary boundary along the lee of the Rockies. Arctic high pressure will slowly shift southeast across central South Dakota tonight. Although slightly warmer air will move into the area, the southerly winds will not make it feel any better. Some teens to lower 20s could be realized across the higher elevations of Northeast Wyoming and the Black Hills.
In grips of arctic cold, expect temperatures to struggle to reach highs from the lower teens northwest to the upper teens southeast. Highly amplified mid level flow with ridge over the west coast and large long wave trof over the eastern conus. Large dome of arctic high pressure to settle southward through the plains the next couple of days. Upper trough featuring anomalously low geopotential heights will dictate weather through the period.
Do expect temps to rebound into the lower teens this afternoon. Monday night begins with models showing broad high pressure and very dry air moving in from the west as moisture exits east.
A very cold day is in store today as we remain under the influence of arctic high pressure. Mountain and foothills locations will be warmer of course. The warmer air west of the divide will keep wind potential in check. Overall, a quiet weather pattern is progged for much of the extended as high pressure builds over the region keeping the area mainly dry. Models indicate a possible weather system breaking the ridge down and impacting the region for the weekend.
11Z surface analysis showed a 1050 mb pressure ridge center over northeast MT, south of a 1049 mb high pressure center over west central Saskatchewan.
As temperatures drop to freezing later this afternoon into tonight, the drizzle may freeze on contact. Some drying is noted in the lowest levels reducing QPF for today into tonight. There could still be spotty minimal ice accumulations on elevated bridges and overpasses in the Hill Country to the Rio Grande Plains. Where temperatures rise above freezing in the afternoon, sleet may melt to rain if the shallow surface above freezing layer is deep enough.
315 AM MST Sun Dec 31 2017 Upper level analysis has broad trof across much of the CONUS, with ridging just off the West Coast. At the surface, arctic high pressure has settled across the Northern Plains, with a stationary boundary along the lee of the Rockies. Arctic high pressure will slowly shift southeast across central South Dakota tonight. Although slightly warmer air will move into the area, the southerly winds will not make it feel any better. Some teens to lower 20s could be realized across the higher elevations of Northeast Wyoming and the Black Hills.
840 AM MST Sun Dec 31 2017 High pressure will remain dominant across the region through the week as temperatures continue to run above normal with highs mostly in the 70s. Upper level ridging will remain over the Southwestern U.
516 AM CST Sun Dec 31 2017 A cold front currently moving through the region was bringing drier surface air and improving visbys. Furthermore, very light freezing drizzle or snow will be possible out of this low cloud layer. Also emphasizing snow more than freezing drizzle over the southern Rolling Plains at least. Cold front on the verge of passing Lubbock at this moment, and will sweep southward before daybreak. The drier air also will erode and lift the low cloud deck, but it may be difficult to totally eliminate these clouds before dark this evening. Initial 4-8 millibar/three hour surface pressure rises early this morning will ease, but as 1050 millibar ridge noses southward to our east, at least low-end breezy conditions will remain through the day and overnight.
High pressure remains in control the next several days with mild daytime temperatures, light winds, and periods of high clouds.
Half an inch looks like it would be on the high end. For temperatures, will see highs in the higher single digits northwest today to the mid teens south, and there won't be a lot of wind (less than 10 mph) with a weaker pressure gradient.
/issued 321 AM CST Sun Dec 31 2017/ A bit busy early this morning with areas of freezing drizzle across portions of western/southern Oklahoma into western north Texas along with some light snow farther north. May see patchy light freezing drizzle or light snow continue for a bit after sunrise across southern Oklahoma and north Texas and will monitor the radar trends to see if an extension of the Winter Weather Advisory for a few more hours is needed.
647 AM EST Sun Dec 31 2017 Canadian high pressure will maintain very cold conditions through the week.
557 AM EST Sun Dec 31 2017 Intense low pressure will remain over the Maritimes today and Monday.
Forecast soundings across southern Oklahoma are cold enough in saturated layer for ice nuclei, but are marginal so retained "slight chance" of freezing drizzle for another few hours, along with snow and periods of flurries. /issued 321 AM CST Sun Dec 31 2017/ A bit busy early this morning with areas of freezing drizzle across portions of western/southern Oklahoma into western north Texas along with some light snow farther north. May see patchy light freezing drizzle or light snow continue for a bit after sunrise across southern Oklahoma and north Texas and will monitor the radar trends to see if an extension of the Winter Weather Advisory for a few more hours is needed.
Warmed up the highs slightly today as we will be starting out warmer with the lows above what was forecast yesterday.
Areas of very light freezing drizzle will persist through about 15z mainly affecting NW AR and SE OK. A gradual eastward shift to the eastern CONUS trough will eventually lead to some relatively warmer weather to close out the next work week.
Winds will become northerly later this morning as a cold front moves through the region. As temperatures drop to freezing later this afternoon into tonight, the drizzle may freeze on contact. Some drying is noted in the lowest levels reducing QPF for today into tonight. There could still be spotty minimal ice accumulations on elevated bridges and overpasses in the Hill Country to the Rio Grande Plains. Where temperatures rise above freezing in the afternoon, sleet may melt to rain if the shallow surface above freezing layer is deep enough.
600 AM CST Sun Dec 31 2017 Upper level flow remains northwest as a ridge persists over the west coast and deep trough over the eastern two- thirds of the United remains under the influence of a mean trough, with a jet stream shoved anomalously far south, allowing for very cold temperatures. The surface temperature will likely stay below zero for much of the area today, except for perhaps near the Nebraska/Kansas state line into north central Kansas where it will struggle to reach the lower single digits. Again, nothing to bank on for warmer temperatures.
519 AM CST Sun Dec 31 2017 Arctic high pressure will make a slow transition across the area through Monday.
Hettinger still has the lowest temperatures this morning, -37F. Currently, north-northwest flow aloft with the core of the Arctic high pressure building into western North Dakota early this morning. Long wave trough persists across eastern North America with Arctic high pressure slowing oozing south-southeastward across the Dakotas today and tonight.
Arctic high pressure is sitting upstream over the western North Dakota and northeast Montana.
with the freezing line just south of San Angelo. Patchy freezing rain, fog, and mist is ongoing across the Concho Valley and Big Country where the Winter Weather Advisory is in effect until 12:00 PM this afternoon. The freezing line will gradually shift southward to the I-10 corridor by this afternoon resulting in light rain transitioning to light freezing rain. QPF amounts will remain light today but with the cold temperatures it will not take much to cause icy roadways, bridges and overpasses. Temperatures will drop rapidly after sunset with New Years morning temps falling into the lower to mid teens across the entire area.
948 AM EST Sun Dec 31 2017 Intense low pressure will remain over the Maritimes today and Monday.
With the arctic air over the region and upslope flow continuing throughout the day, temperatures across the region will remain in the teens and 20s across the lower elevations. In the higher valleys, temps will continue mild and expect mid 40s in the SLV and upper ark rvr valley this afternoon. It will be quite cold tonight across the lower elevations.
Early morning patchy fog that develops overnight will burn off before noon, but should redevelop more widely early Monday as an upper ridge moves over the region. As warm air streams in aloft with the ridge, inversion conditions will redevelop in the valleys with temperatures there trending colder Monday and mountain temperatures trending warmer.
Highly amplified mid level flow with ridge over the west coast and large long wave trof over the eastern conus. Large dome of arctic high pressure to settle southward through the plains the next couple of days. Upper trough featuring anomalously low geopotential heights will dictate weather through the period.
A few trailing showers also movg across the KELD terminal, but are post cold frontal. Lowered the chance of rain in wake of the band of convection and made adjustments to the trend in temperatures and dew points along with the winds in wake of the cold front.
1217 AM EDT Thu Apr 27 2017 Weakening low pressure off the New Jersey coast will slowly drift northeastward tonight into early Thursday.
Upper trof/shear axis will continue to move northeast tonight, with all the pcpn gradually ending this evening. Thus, temperatures should be appreciably warmer than the past 24 hours.
1133 PM CDT Wed Apr 26 2017 Large upper-level trough continues to work through the central U. Main issue with this afternoon's package revolves around possible frost development early Thursday morning as high pressure gradually builds into the region.
615 PM CDT Wed Apr 26 2017 Large upper-level trough continues to work through the central U. Main issue with this afternoon's package revolves around possible frost development early Thursday morning as high pressure gradually builds into the region.
Current surface analysis shows weak high pressure nosing south out of central Canada and into the Dakotas. Low pressure is located across southern BC, with cold front stretching across the Pacific NW.
Some freezing temperatures will occur overnight in western and central Minnesota where the growing season hasn't started. However, cloud cover and brisk winds will keep most areas in southern Minnesota near or slightly above freezing.
716 PM CDT Wed Apr 26 2017 Deep upper trof will swing thru the region this evening with the cdfnt pushing sewd thru the area. Have trended temps twd the warmer guidance with clouds expected to clear out during the morning hours. Have not gone above the warmer guidance due to at least some clouds expected to spill back into the region during the afternoon.
929 PM EDT Wed Apr 26 2017 Warm, dry weather will be interrupted by showers and storms with a Thursday cold front. Generally light southerly flow will continue over the area overnight as high pressure starts to slip eastward. Subsidence from this should allow for clear skies to remain (outside of some convective blow-off cirrus which may skirt the western areas through midnight), which coupled with dewpoints in the 50s, which will be about the lows in the morning, as well as wet soil across the eastern portions of the CWA, may allow for some local fog formation around Jefferson County, PA, or amongst the ridges. Fries A cold front associated with an occluding system will cross the CWA during the late afternoon/early evening.
Problem overnight may be roads freezing as temps fall below freezing. Snowfall rates haven't been terribly high this afternoon with accumulations fairly slow to pile up, especially on warmer road surfaces. However, snowfall rates will have to get pretty intense to start accumulating a lot on the warmer roads. Some lingering snow showers might stick around far northeastern portions of the area early on Thursday before surface ridging builds in with a mostly dry day expected. Temperatures will finally begin to rebound a bit across the west near the ridge axis with readings into the 40s, but remain a bit colder in the 30s in the far east as the previous system slowly pulls away. with the stronger stream crossing the southern plains and carving out a broad upper trof.
This line could even slow down some, as the upper level trough does take on a more negative tilt. Overall think we could still be looking at a 10 degree split from the ridges to the valleys. A fast moving cold front is forecast to move across the Ohio and Tennessee valley regions during the day on Thursday. With precipitation and extensive expected to spread across the area tomorrow, temperatures will not be able to warm nearly as much as they have the past couple of days, but we should still highs max out in the low to mid 70s, which is still slightly above normal for this time of year.
Surface winds will veer as high pressure centered north of the aerodromes moves off towards the east. /issued 324 PM CDT Wed Apr 26 2017/ SHORT TERM (Tonight through Thursday Night): 500mb trough across the south central United States this afternoon will move eastward tonight and a broad 500mb trough will prevail across the southern United States Thursday into Thurs night. a weak cold front will move through the CWA this evening providing some relief tonight to the record high temperatures across the CWA this afternoon.
859 PM PDT Wed Apr 26 2017 A deepening trough over the Great Basin and a strong ridge over the eastern Pacific will bring gusty onshore winds over the mountains and deserts through Thursday morning.
On the back side of the upper low, drier air, as evidenced by satellite imagery, will gradually make its way east. Temperatures tonight will be the coldest in the 7 day forecast period as the base of the H5 trough rotates through the area dragging -4 to -6C temps at H85 along with it. All areas are expected to go below freezing so people with vulnerable vegetation outdoors should make plans to mitigate the impacts of below freezing temperatures for several hours overnight. This in turn will allow temps to warm into the lower 50s most areas, which will be 10 to 15 degrees more than today, but still below normal for this time of year.
A sharp H300 meridional trough centered over the central CONUS will progress E/NE over the next 24 hours with a more zonal flow upper level pattern settling in across the base of the broad upper trough by tomorrow morning. At the surface, a N-S elongated ridge axis will build east across eastern Kansas by tomorrow morning, with light winds and temperatures dropping into the low 30s north to mid/upper 30s south.
739 PM CDT Wed Apr 26 2017 An upper level trough is currently pushing east across the region this afternoon. Ahead the trough an area of showers is spreading east across the area. A cold front is currently pushing east across the eastern Ozarks where more in the way of moderate showers and a few embedded rumbles of thunder are occurring this afternoon. The trough will continue to spread east across the area tonight with rain ending from west to east late this afternoon into this evening. A cooler air mass is spreading into the area behind the front as temperatures are currently in the middle 40s to the middle 50s this afternoon. Lows will drop into the upper 30s to the lower 40s tonight into Thursday morning. An upper level low will then dig into the southwestern U.
1151 PM CDT Wed Apr 26 2017 An upper level trough is currently pushing east across the region this afternoon. Ahead the trough an area of showers is spreading east across the area. A cold front is currently pushing east across the eastern Ozarks where more in the way of moderate showers and a few embedded rumbles of thunder are occurring this afternoon. The trough will continue to spread east across the area tonight with rain ending from west to east late this afternoon into this evening. A cooler air mass is spreading into the area behind the front as temperatures are currently in the middle 40s to the middle 50s this afternoon. Lows will drop into the upper 30s to the lower 40s tonight into Thursday morning. An upper level low will then dig into the southwestern U.
606 PM MDT Wed Apr 26 2017 Current surface analysis shows weak high pressure nosing south out of central Canada and into the Dakotas. Low pressure is located across southern BC, with cold front stretching across the Pacific NW.
748 PM EDT Wed Apr 26 2017 Cold front crosses the region on Thursday. Weak warm front move through this weekend.
Lowered the chance of rain in wake of the band of convection and made adjustments to the trend in temperatures and dew points along with the winds in wake of the cold front. W/NW will follow convection closely and strong sustained values will quickly drop off W to E with only weak high pressure.
705 PM EDT Wed Apr 26 2017 A trough of low pressure extended from Wisconsin to Texas along a cold front. Low pressure will strengthen in Arkansas along the front this evening and move north to the central Great Lakes overnight. Thursday the low will continue north into Canada and the trailing cold front will sweep east across the area.
/26/ Tonight through Thursday: Latest satellite imagery showed an upper trough moving through the plains. On the surface a front was observed across East Texas into West Arkansas with deepening low pressure across Northeast Texas. The atmosphere was rather capped across the region at mid afternoon with readings in the upper 70s to the lower 80s. On Thursday high pressure will build across the ArkLaMiss from the west. As far as temperatures are concern lows tonight will range from the lower 50s west to the lower 60s southeast. Highs on Thursday will range from the middle 70s north to the lower 80s southeast.
942 PM EDT Wed Apr 26 2017 Cold front crosses the region on Thursday. Weak warm front move through this weekend.
1157 PM CDT Wed Apr 26 2017 Deep upper trof will swing thru the region this evening with the cdfnt pushing sewd thru the area. Have trended temps twd the warmer guidance with clouds expected to clear out during the morning hours. Have not gone above the warmer guidance due to at least some clouds expected to spill back into the region during the afternoon.
A couple of weak upper level troughs along with continuing onshore flow will keep skies mostly cloudy with scattered showers through Thursday night.
920 PM EDT Wed Apr 26 2017 A trough of low pressure extended from Wisconsin to Texas along a cold front. Low pressure will strengthen in Arkansas along the front this evening and move north to the central Great Lakes overnight. Thursday the low will continue north into Canada and the trailing cold front will sweep east across the area.
Surface wise, a western Atlantic ridge axis extends across the Sunshine State and into the Gulf of Mexico.
1034 PM EDT Wed Apr 26 2017 Weakening low pressure off the New Jersey coast will slowly drift northeastward tonight into early Thursday.
South surface winds will be gusty ahead of the cold front tonight, with some gusts expected to reach 23 to 32 kts.