Aikyam-Lab/Synoptic-Bench huggingface dataset:
Snow accumulation ranges from: C-1" across the mid to lower Susquehanna Valley 1-2" in NW Alleghenies to central ridge/valley region 2-3" in the Laurel Highlands Orographic lift will help drive locally higher amounts in the Laurel ridgetops and summits particularly to the west of US-219. A winter wx advisory remains in effect for Cambria and Somerset Counties where the highest snowfall is forecast, but anyone traveling overnight into early Saturday morning should be prepared for slippery road conditions and reduced visibility. 5 inch or less over the western and northern Alleghenies with locally up to an additional 2" on the Laurel Ridge along the Indiana to Westmoreland/Fayette County border.
The showers are in advance of a cold front situated near the west coast. VFR becoming MVFR/IFR after 00Z with cold front passage and potential for RASN. A cold front will bring MVFR/IFR rain and snow showers to the region tonight into Saturday morning with mountain obscuration, areas of low clouds, and fog.
With temperatures falling into the teens and 20s across the area, there could be a real concern for some freezing fog tonight. I have added mention of areas of freezing fog along and north of a line from Tyler, TX to Texarkana, to Prescott, AR for tonight and then patchy freezing fog for the remainder of the region. In addition to the freezing fog potential, caution should be used for areas that were unable to get significant melt off the roads during the day today. Temperatures will rebound fairly well on Saturday, with all of the region climbing above freezing.
A relatively strong Pacific cold front is expected to arrive in the Northern Rockies this afternoon, bringing moderate to heavy snow to the mountains and mountain passes along the ID/MT border. The cold front will also bring moderate snowfall to the Seeley/Swan Region and Highway 2 from West Glacier between 5 PM and 10 PM this evening.
1138 AM CST Fri Jan 10 2025 - Mostly sunny skies and seasonably cool temperatures (highs near freezing) today.
Lesser traveled roads and construction areas might hang on to a few puddles and leave a minor threat for black icing, given the several hours of subfreezing temperatures.
The coldest temperatures were in the mountain valleys where temperatures fell below zero and in Park County, the low lying areas dropped to -20F to -30F. For tonight, winds increase and become strong over the Front Range Mountains and foothills as an upper level trough dives south across the Central Rockies. Maybe a small high wind threat, but gusts in the 40-60 mph range in exposed areas with up to 75 mph in the higher elevations and the wave hot spots looks likely.
" As several locations across the southwest to central Texas Panhandle sit beneath 6-12 inches of snow pack with drifts multiple feet deep, temperatures in these areas will likely remain several degrees cooler than the surrounding areas. Overnight lows will be in the teens and 20s the next couple nights, so be mindful of any icy/slick spots due to melting & refreezing on the roads! Saturday temperatures will have the same caveats as today, except about 10 degrees warmer in the 40s under sunny skies. Expect areas with deeper snow pack to be cooler once again, perhaps remaining in the 30s based on the 12z HRRR, which is initializing the areas of snowpack well. a broad upper level trough will drop south across the CWA tomorrow afternoon-evening along with a weak cold front, bringing somewhat breezier north winds and slightly cooler temperatures.
Refrozen snowmelt offers a risk to motor transportation for the next several nights as temperatures fall below freezing.
1255 PM EST Fri Jan 10 2025 High pressure from the eastern Great Lakes to the Southeast states will move off the east coast tonight. An area of low pressure currently near New Orleans will track northeast, exiting off of the Mid Atlantic coast Saturday morning.
1016 AM MST Fri Jan 10 2025 - Snow this weekend with areas of hazardous travel due to snow/blowing snow - Strongest, gustiest winds Saturday - Heavy upslope snow for the favored areas of the northern Black Hills this weekend - Heavy snow possible over northeastern Wyoming 09z surface analysis had weak ridge over the northern Plains. Water vapour loop had upper ridge spilling from the northern Rockies into the northern Plains ahead of upper trough coming onshore via BC.
Once the rest of the rain moves out, it should be dry out and cooler air will settle in.
With morning low temperatures coming in a little warmer than expected (KTUS low of 33 degrees), we have still yet to see a freeze at the Tucson airport this season. We analyzed morning low temperatures and found that freezes have been hit and miss in the lower elevations this season and have yet to be widespread.
Winter Weather Advisories have been issued for the Lower Clark Fork Region, particularly for I-90 From Lookout Pass to Haugan, and for Lolo and Lost Trail Passes. A cold front will bring moderate snowfall to the mountains and mountain passes along the ID/MT border, as well as for elevations above 4000 feet in north-central Idaho this afternoon, through the overnight hours.
We are monitoring the possibility of patchy black ice tonight and tomorrow morning as temperatures are expected to fall back below freezing tonight. /SAS/ Today through tonight: winter weather is always a forecast challenge in our region, and this event has been no exception with precipitation type bouncing around a good bit along and north of the Highway 82 corridor, especially in the Golden Triangle region where snow has managed to accumulate more efficiently than expected. Have maintained the warning/advisory areas and opted to end them sooner as temperatures look to climb above freezing later this morning.
- Warmer tomorrow, but the next approaching weather system will send a cold front through that could be accompanied by some light snow. Water vapor satellite imagery and RAP upper air analysis at midday reveals the highly amplified, positively-tilted trough that brought yesterday's snow has moved on to the Upper Midwest through Dixie Alley, allowing DNVA to overspread the central plains and provide us with completely clear skies. However, this warmth will be short lived as a weak upper level trough digs southeast from the Pacific Northwest towards the central plains, and sends another cold front through our area.
A deep cold trough continues to swing across the midwest this afternoon. Saturday will generally be dry, but likely still at least partly cloudy due to northwest flow pulling moisture off of Lake Michigan which will become trapped under a high pressure inversion.
By late morning, precipitation changed from all snow to a wintry mix, before switching to light rain over portions of the area from the HSV/DCU metro southward as temperatures warmed just above the freezing mark. Light precipitation will continue across the region through the remainder of the day in the form of light rain, sleet, or freezing rain (depending on surface temperatures) in north Alabama -- and a mix of light snow/sleet in southern middle Tennessee. A glance at model soundings indicates that temperatures will cool enough to support some low chances for light snow (or possibly freezing drizzle). The combination of a snow/ice pack and subfreezing temperatures will maintain/further create dangerous travel conditions, especially on secondary roads as lingering snow/slush refreezes into black ice.
Synoptic overview and current conditions: Water vapor imagery and upper level analysis show a deep upper level trough from western Lake Superior extending southwest through west TX and was currently pushing into our CWA. This still gives us temperatures above freezing for the area, with highs in the mid 30s to upper 30s.
For tonight the winter weather advisory continues as the rain could become heavy enough to see temperatures drop to near or just below freezing. 15 inches of freezing rain. Cool and dry for the short term period as low level ridge sits overhead and PWATs drop to 0.
156 PM EST Fri Jan 10 2025 Flow aloft over the region this afternoon has become more southwest as a trough axis moves through the central part of the country. At the surface, high pressure over the southeast has shifted toward the Atlantic Ocean as low pressure makes its way along the northern Gulf Coast. A cold front associated with this system will make its way over the peninsula tonight through tomorrow morning. A few lingering showers are in the forecast for Saturday morning (about a 20% chance) from around I-4 southward, but then the rest of the day is expected to be rain-free as high pressure moves over the southeast once again.
(Now through Saturday Night) A weak area of low pressure will continue to move east of the area by this evening. A broad southwest upper flow will maintain some weak overrunning low clouds and light rain through this evening before the upper trough moves through Saturday morning. High temps on Saturday remain cold, in the low to mid 40s inland to upper 40s along the coast. Lows Saturday night drop into the low to mid 20s inland to low/mid 30s along the coast.
Updated at 242 PM CST Fri Jan 10 2025 - There is a medium-high (40-70%) chance for dense and/or freezing fog across south-central into southeast Oklahoma early Saturday morning. In coordination with adjacent offices, have gone ahead and issued a Freezing Fog Advisory for portions of south central and southeastern Oklahoma overnight. As a result, temperatures have warmed above freezing for most locations, allowing for snowmelt and improved travel conditions. Combined with sub-freezing temperatures, freezing fog (slick roadways) is possible where dense fog (visibility <1/4-mile) develops.
452 PM CST Fri Jan 10 2025 - Chance (30-40%) for a wintry mix of rain, freezing rain, and snow Saturday afternoon and Saturday night. A longwave, mid-level trough extends from Ontario, Canada into northern Mexico this afternoon with mid-level ridging over the western US. Surface temperatures will be hovering right around freezing and will be the difference between rain and freezing rain. 05" or less of liquid), but impacts are still possible from this wintry mix, especially if freezing rain is the dominant precipitation type. Models depict westerly winds across north central Kansas leading to some WAA keeping temperatures above freezing through the afternoon, while areas farther east will flirt with the 32 degree mark through much of the day and into the evening.
A cold front is pushing through the area and will move east of the area early this evening. An upper trough will move in bringing post frontal showers into this evening.
- Near to above freezing temperatures will facilitate some melting of snow today; however, lows in the teens will likely result in some refreezing/slick spots.
550 PM CST Fri Jan 10 2025 Through Saturday: As the low departs the area, cold air wraps around the backside and we could see a brief round of spitting flurries before precip tapers off later this afternoon. We will see a return of cold temperatures tonight as high pressure builds in, with lows in the upper 20s and low 30s. For areas along and south of I-20, higher winds are likely to dry the roads and slightly warmer temperatures will make black ice formation more difficult. This low level moisture should clear out of the area later tomorrow afternoon and evening as flow turns out of the south to allow for breaks in the clouds closer to sunset.
306 PM CST Fri Jan 10 2025 Through Saturday: As the low departs the area, cold air wraps around the backside and we could see a brief round of spitting flurries before precip tapers off later this afternoon. We will see a return of cold temperatures tonight as high pressure builds in, with lows in the upper 20s and low 30s. For areas along and south of I-20, higher winds are likely to dry the roads and slightly warmer temperatures will make black ice formation more difficult. This low level moisture should clear out of the area later tomorrow afternoon and evening as flow turns out of the south to allow for breaks in the clouds closer to sunset.
402 PM CST Fri Jan 10 2025 - Near to above freezing temperatures will facilitate some melting of snow today; however, lows in the teens will likely result in some refreezing/slick spots.
624 PM EST Fri Jan 10 2025 Low pressure centered well to our southwest will track northeastward tonight, resulting in light snow overspreading the area. As the low pressure pushes offshore of the Mid-Atlantic coast early Saturday morning, high pressure begins to build toward our area later Saturday.
- Hazardous travel conditions will materialize tonight due to black ice and the development of freezing fog. Wind chills will be in the lower teens with a few isolated spots in the upper single digits. Given temperatures will be well below freezing, any fog that develops will quickly freeze upon contact. In addition to the freezing fog, any water on the road due to the recent rain/snow will refreeze. Travel impacts due to the combination of black ice and freezing fog will begin to improve late tomorrow afternoon as temperatures rise above freezing. Highs tomorrow will be in the lower to mid 40s across North Texas where snow remains on the ground. Those across Central Texas will see temperatures in the lower to mid 50s with southerly winds between 10-15 mph.
The upper ridge is shifting off to the east of the forecast area as an upper trough approaches from the west.
(Tonight) Drizzle, freezing drizzle and perhaps a few snow grains were shifting east through Franklin County TN and east of U. Temperatures have dipped back to 32 degrees in valley areas in this precipitation zone, and did rise above freezing atop the higher elevations. However, expect those to slide ever so slowly back below freezing later tonight, especially if any even small patches of clearing can take place.
459 PM CST Fri Jan 10 2025 Updated at 450 PM CST Fri Jan 10 2025 - Chilly tonight, then breezy and much warmer on Saturday. While this will bring notably warmer temperatures compared to today, the prior-mentioned snowpack will limit the degree of warming compared to snow-free areas.
Snowfall will be limited more to the higher elevations today for western mountains and the Bighorns, which are in a good positions for the push of precipitation from the north. As the initial trough axis passes, precipitation will taper off for the western mountains this evening, with an additional 3 to 6 inches of snow accumulations.
1231 AM EST Sat Jan 11 2025 Widespread snow will transition to scattered snow showers this morning as a cold front crosses the area.
- Hazardous travel conditions will continue through Saturday morning in North Texas due to refreezing of slush into black ice along with the development of freezing fog. A light coating of ice will make for slick roadways, especially bridges and overpasses, before conditions rapidly improve by midday.
Meanwhile, the strengthening 850mb thermal ridge and warmer southwest surface winds will bring some warming to the area today, with highs in the low to upper 50s. Tonight, a cold front will push through the region from the north, with lows in the upper 20s to low 30s.
Updated at 228 AM CST Sat Jan 11 2025 - Breezy and much warmer on Saturday. Upper flow will become more zonal by late morning as another upper trough amplifies across the western CONUS and weak upper ridging sets up over the Mississippi/Ohio River Valleys. This next upper trough will push a cold front southward into our northern zones by sunset, with the front being south of the FA by midnight. The cold front will have little affect on at least tonight's temperatures as overnight lows will actually be warmer than this morning's lows, low 20s to low 30s.
340 AM EST Sat Jan 11 2025 High pressure will shift into the Southeast bringing cold, dry air into the forecast area this weekend. Wetbulb temps at most locations are above freezing indicating little potential for additional ice accretion. This typically favors temperatures cooler than model guidance. Lows in the low 20s are likely with teens possible for some areas.
At 8 PM MST a cold front and snow-band were moving across southwest Idaho about as forecast, and should be completely out of our CWA by midnight. At 03Z cold front extended through Stanley,ID/ KMUO, and KREO and moving rapidly southeastward.
905 PM CST Fri Jan 10 2025 Skies are cloudy across the Mid-South this evening with temperatures in the low to mid 30s. Refrozen snowmelt offers a risk to motor transportation for the next several nights as temperatures fall below freezing.
1144 PM CST Fri Jan 10 2025 (Tonight) Drizzle, freezing drizzle and perhaps a few snow grains were shifting east through Franklin County TN and east of U. Temperatures have dipped back to 32 degrees in valley areas in this precipitation zone, and did rise above freezing atop the higher elevations. However, expect those to slide ever so slowly back below freezing later tonight, especially if any even small patches of clearing can take place.
Water vapor satellite imagery showing an upper level trough over the Pacific Northwest. This trough will dive southeast over the next 24 hours, including moving across Colorado Saturday. Flow aloft turns westerly ahead of the trough tonight and early Saturday morning. Lift from the trough and orographic lift will produce snow for a good part of Saturday over the mountains. A cold front pushes south through the area mid day bringing northerly winds.
- Temperatures below freezing during nighttime hours next few nights will re-freeze any melted snow, resulting in continued hazardous travel on secondary roads.
1115 PM CST Fri Jan 10 2025 Skies are cloudy across the Mid-South this evening with temperatures in the low to mid 30s. Refrozen snowmelt offers a risk to motor transportation for the next several nights as temperatures fall below freezing.
1019 PM CST Fri Jan 10 2025 - Chance (30-40%) for a wintry mix of rain, freezing rain, and snow Saturday afternoon and Saturday night. A longwave, mid-level trough extends from Ontario, Canada into northern Mexico this afternoon with mid-level ridging over the western US. Surface temperatures will be hovering right around freezing and will be the difference between rain and freezing rain. 05" or less of liquid), but impacts are still possible from this wintry mix, especially if freezing rain is the dominant precipitation type. Models depict westerly winds across north central Kansas leading to some WAA keeping temperatures above freezing through the afternoon, while areas farther east will flirt with the 32 degree mark through much of the day and into the evening.
352 AM EST Sat Jan 11 2025 Widespread snow will transition to scattered snow showers this morning as a cold front crosses the area.
1050 PM CST Fri Jan 10 2025 Updated at 242 PM CST Fri Jan 10 2025 - There is a medium-high (40-70%) chance for dense and/or freezing fog across south-central into southeast Oklahoma early Saturday morning. In coordination with adjacent offices, have gone ahead and issued a Freezing Fog Advisory for portions of south central and southeastern Oklahoma overnight. As a result, temperatures have warmed above freezing for most locations, allowing for snowmelt and improved travel conditions. Combined with sub-freezing temperatures, freezing fog (slick roadways) is possible where dense fog (visibility <1/4-mile) develops.
1028 PM CST Fri Jan 10 2025 Updated at 1027 PM CST Fri Jan 10 2025 - Chilly tonight, then breezy and much warmer on Saturday. While this will bring notably warmer temperatures compared to today, the prior-mentioned snowpack will limit the degree of warming compared to snow-free areas.
This more veered flow has brought in much warmer conditions with increased moisture. Short Term Update - The previously mentioned deepening low will continue to drive northeastward overnight into the Mid Atlantic region while its associated prefrontal trough advances southeastward into extreme southeastern Gulf of Mexico. Winds are expected to trend downwards over the next few hours, but there is a window for modestly strengthening breezes late in the night due to a somewhat tighter pressure gradient moving in ahead of the approaching prefrontal trough. The increase in theta-e along with increasing low level lift and confluence ahead of the approaching prefrontal trough will try to set the stage for isolated showers.
A cold front passed through the CWA, causing rough winds through the Columbia Basin.
255 AM CST Sat Jan 11 2025 - Brief round of scattered rain, snow, and freezing rain this evening.
Early morning IR satellite and radar imagery is showing the next in a series of cold fronts pushing southeast into the Florida Peninsula. Lows tonight will drop into the low to mid 30s over the Nature Coast, resulting in some patchy frost and pockets of freezing conditions, and into the 40s and low 50s across the rest of west central and southwest Florida.
Regional satellite imagery depicted an area of low stratus exiting portions of E and NE AR with patchy freezing fog developing over portions of Wrn AR.
651 AM EST Sat Jan 11 2025 Early morning IR satellite and radar imagery is showing the next in a series of cold fronts pushing southeast into the Florida Peninsula. Lows tonight will drop into the low to mid 30s over the Nature Coast, resulting in some patchy frost and pockets of freezing conditions, and into the 40s and low 50s across the rest of west central and southwest Florida.
This combination will allow for warmer temperatures this afternoon, as highs climb to the upper 50s to low 60s. Light winds and clear skies overnight will keep low temperatures in the low to mid 40s tonight. Despite the increased cloud cover and cold front, high temperatures are forecast to climb back to the mid 60s to low 70s Sunday afternoon.
Gradual clearing is expected tonight into Sunday morning with the potential of freezing fog, especially in areas that have snow cover.
With early morning temperatures forecasted in the upper 20s across our CWA, standing water on roads, particularly in the northern areas, could refreeze this morning which could lead to patchy spots of black ice on roads and bridges. Expect afternoon highs to climb into the low to mid 40s areawide.
530 AM CST Sat Jan 11 2025 (Today through Sunday Night) Early morning temperatures across the Brazos Valley/Piney Woods area sit just under the freezing mark with dewpoints in the upper 20s. Cannot rule out some isolated freezing fog across the northern reaches of the Brazos Valley/Piney Woods area. Utilized the NAM and some manual edits to sketch out which areas are "most likely" to see freezing fog, if any at all. Rain chances taper off Sunday evening as the coastal trough pushes off to the east. Around this time, the aforementioned slog of cooler air pushes into the Brazos valley as a very weak cold front.
However, the passage of the upper trough axis combined with orographic forcing should keep light snow/snow showers going over the NW Mtns and Laurel Highlands today, with nothing more than flurries anticipated downwind (east) of the mountains. However, orographic enhancement could produce another 1-2 inches on the Laurel Ridge over Western Somerset County. Ridging aloft and a developing southwest flow should result in fair and seasonable weather Sunday.
642 AM EST Sat Jan 11 2025 Widespread snow will transition to scattered snow showers this morning as a cold front crosses the area.
545 AM CST Sat Jan 11 2025 - Light snow today into Sunday morning, greatest accumulations across far NW Sandhills - Warmer temperatures today, with warmest highs across southwest Nebraska - A cold front will move through late Saturday, bringing cooler temperatures on Sunday As the system approaches the area this morning, light snow will be possible across the NW Sandhills. Temperatures will warm across the southern Sandhills to north central Nebraska and southward into the 30s to low 40s, with the low 40s generally across southwest Nebraska.