Aikyam-Lab/Synoptic-Bench huggingface dataset:
750 PM EDT Mon Apr 21 2025 A cold front will arrive tonight and stall across our area on Tuesday, providing a focus for mainly scattered afternoon and evening showers and thunderstorms. Showers associated with the cold front are finally pushing across the far SW NC mountains this evening and activity will continue to spread east along the NC/TN border over the next few hours. High- and mid-level cloud cover will thicken significantly after sunset, so the low temperature forecast isn't in jeopardy, and should still land a solid 10+ degrees above normal. While the low-level kinematics don't look favorable for any tornadic threat, there's a nonzero chance of some large hail and/or damaging winds if storms become strong to severe.
/Issued 158 PM MDT Mon Apr 21 2025/ - Meteorological Overview: A broad trough aloft will continue to bring disturbances through the area.
Ludwig /Issued 650 PM MDT Mon Apr 21 2025/ - Meteorological Overview: A broad trough aloft will continue to bring disturbances through the area.
626 PM EDT Mon Apr 21 2025 A cold front will arrive tonight and stall across our area on Tuesday, providing a focus for mainly scattered afternoon and evening showers and thunderstorms. As of 620 PM EDT Monday: Main change needed this evening was removing PoPs across the NC/TN border through 23Z as convection associated with the cold front is pushing across eastern TN and remains just west of the NC mountains this evening. High- and mid- level cloud cover is still expected to thicken significantly after sunset, so the low temperature forecast isn't in jeopardy, and should still land a solid 10+ degrees above normal. While the low-level kinematics don't look favorable for any tornadic threat, there's a nonzero chance of some large hail and/or damaging winds if storms become strong to severe.
This high is the current culprit behind the fresh northeast to east breezes across our waters.
1000 PM EDT Mon Apr 21 2025 High pressure will remain offshore tonight. Low pressure will move from the upper Great Lakes across southern Canada through Tuesday night. High pressure builds back over the area Tuesday and lasts through the end of the week.
917 PM EDT Mon Apr 21 2025 A warm front will lift north through the forecast area this evening, ahead of a cold front pushing through overnight. High pressure builds to the north through midweek as the cold front stalls to our south. Another low pressure system and associated cold front bring precipitation chances this weekend. The early evening frontal analysis places a slow moving warm front across northern Maryland back into southeastern Virginia. A band of showers has struggled east of the Blue Ridge with only some scattered activity moving toward the Baltimore metro this evening. With the parent cold front still west of the Allegheny Front, some additional spotty showers are possible during the first half of night.
354 AM EDT Tue Apr 22 2025 High pressure will keep much of the remainder of the week dry.
* As a ridge of high pressure builds over the southeastern Pacific, expect warming temperatures, dry conditions, and breezy afternoons through Thanksgiving Day.
346 AM MST Sat Nov 22 2025 - Patchy to dense fog over the eastern CWA is occurring and should remain above freezing. - A 50-60% chance of freezing fog across southwestern portions of the area early this morning, leading to slick elevated surfaces, such as bridges.
- A strong cold front brings near to below average temperatures to the area by Thanksgiving. (Today through Sunday afternoon) Upper-level ridging largely remains in control of our weather today. At the surface, an area of high pressure is currently centered over the central Plains. This is pushing a weak cold front down through the Panhandle which is expected to drop into our region later this morning.
628 AM EST Sat Nov 22 2025 An area of low pressure moves through this morning with a weak clipper system passing by to the north on Sunday.
718 AM EST Sat Nov 22 2025 High pressure will build across the region later today through Sunday.
(Today through Sunday) The weather pattern will remain generally unchanged today as ridging prevails aloft and an area of high pressure remains established over the western Atlantic. This will continue to promote light easterly flow and generally dry conditions across the area, with temperatures rising to the low-mid 80s by late afternoon. On Sunday, a subtle upper level longwave trough will develop over the Eastern seaboard, and a weak front will drop along northern/central Florida during the day. Although winds are forecast to shift from the north/northwest with this frontal approach, the cooler airmass will not reach our area, and temperatures will remain warm, with highs in the low-mid 80s once again on Sunday afternoon.
420 AM EST Sat Nov 22 2025 Low pressure will exit the area today.
(Today and tonight) A weak, northwest to southeast oriented cold front has pushed through much of the region just before midnight. The rest of today should be quiet with upper ridging over the region through today ahead of the next upper system which is expected to reach the Four Corners region by late tonight.
Visibilities of one-quarter mile or less have been observed into the lower Yakima Valley, so opted to expand the existing Dense Fog Advisory to include our Yakima Valley forecast zone. Light winds Today will give way to increasingly breezy southwesterly surface winds for Sunday as the High pressure moves away, pressure falls and a cold front approaches the area from be PAC NW for late Sunday and Sunday night.
- Slightly cooler and drier conditions to end the weekend behind a weak cold front.
133 PM EST Sat Nov 22 2025 High pressure builds in tonight and then moves east Sunday.
1043 AM CST Sat Nov 22 2025 New Information added to update section Couple reports of light snow and/or graupel in northern WI and also over portions of central WI as warm air advection precip, with touch of mid-level instability, shifts across the region ahead of cold front. Main area of concern from this precip impact wise would be over northern WI if ptype falls as rain (as it did upstream at IWD) as road temps in far northern WI are still just below freezing.
1233 PM CST Sat Nov 22 2025 - High pressure will provide dry weather and unseasonably warm temperatures through Sunday Night.
1112 AM CST Sat Nov 22 2025 Updated aviation portion for 18Z TAF issuance Couple reports of light snow and/or graupel in northern WI and also over portions of central WI as warm air advection precip, with touch of mid-level instability, shifts across the region ahead of cold front. Main area of concern from this precip impact wise would be over northern WI if ptype falls as rain (as it did upstream at IWD) as road temps in far northern WI are still just below freezing.
1041 AM CST Sat Nov 22 2025 - Weak cold front will knock down temperatures today across the entire Four State Region but temperatures across our southeast half will remain above normal for late November.
Visibilities of one-quarter mile or less have been observed into the lower Yakima Valley, so opted to expand the existing Dense Fog Advisory to include our Yakima Valley forecast zone. Light winds today will give way to increasingly breezy southwesterly surface winds for Sunday as the high pressure moves away, pressure falls and a cold front approaches the area from be PAC NW for late Sunday and Sunday night.
1030 AM EST Sat Nov 22 2025 Low pressure will exit the area today.
1258 PM CST Sat Nov 22 2025 - Weak cold front will knock down temperatures today across the entire Four State Region but temperatures across our southeast half will remain above normal for late November.
Lows should mainly be above freezing today and should be in the mid to upper 30s. A large upper level low is still expected to move out across the central Rockies Sunday.
1235 PM MST Sat Nov 22 2025 KEY MESSAGES: - Sunday Night Cold Front: Burst of moderate to heavy snow and gusty wind over mountain passes.
Low stratus continues to blanket much of the lower Columbia Basin, Yakima and Walla Walla, and Wallowa valleys. Elsewhere, skies are mostly clear to partly cloudy as we await the arrival of a Pacific cold front Sunday. Snow levels will drop Sunday afternoon through Sunday night as the cold front sweeps across the region.
602 PM CST Sat Nov 22 2025 - Weak cold front will knock down temperatures today across the entire Four State Region but temperatures across our southeast half will remain above normal for late November.
500 PM CST Sat Nov 22 2025 - High pressure will provide dry weather and unseasonably warm temperatures through Sunday Night.
247 PM PST Sat Nov 22 2025 Widespread precipitation across the lower deserts and adjacent mountain slopes through this morning with showers occasionally making it west of the mountains.
Otherwise, a very quiet weather pattern now through Thanksgiving week as a high pressure ridge builds into the region.
545 PM CST Sat Nov 22 2025 - Slightly cooler and drier conditions to end the weekend behind a weak cold front.
721 PM EST Sat Nov 22 2025 Isolated showers are possible this afternoon and evening ahead of an approaching cold front that will pass through the region. The cold front is slowly pushing towards us out of the central Appalachians, forcing isolated showers and storms along the NC/SC border. Key message(s): - Dry and not as warm as high pressure passes to the north.
Areas of fog are expected to develop later tonight into early Sunday morning, especially from around the Interstate 4 corridor northward as slightly more moisture moves in from the north ahead of a weakening cold front. The lowest visibilities and ceilings are expected away from most of the TAF sites, except LAL, but there could be some patches of IFR/local LIFR conditions.
Another great weather day Sunday with temps a couple of degrees cooler than today.
Most areas have cleared to VFR this afternoon, though LIFR conditions still persist in the lower portion of the Rogue Valley (Grants Pass/Merlin) and in the Umpqua Basin.
LIFR conditions in fog/freezing fog in west side valleys will persist through around 17-18Z Sunday morning, with patches of LIFR freezing fog also likely in east side valleys early in the morning (around 13-17Z). But, it will also bring increasing MVFR conditions and obscuration of the higher terrain from west to east Sunday afternoon into the evening.
1017 PM CST Sat Nov 22 2025 - Weak cold front will knock down temperatures today across the entire Four State Region but temperatures across our southeast half will remain above normal for late November.
- A cold front will bring cooler much less humid conditions to the region late in the week A weak cold front will sink south across the region today with the only change being that winds will shift to the north and northwest.
- Cooler and dry conditions will wrap up our weekend. High temperatures will be in the low 60s to low 70s on Sunday.
1155 PM CST Sat Nov 22 2025 - Slightly cooler and drier conditions to end the weekend behind a weak cold front.
WESTERN RIVERSIDE AND SOUTHWESTERN SAN BERNARDINO At 9 PM a few scattered showers were lingering in the High Desert, Coachella Valley, and desert slopes of the San Bernardino and Riverside county mountains.
The lowering winds and clearing skies will result in cooler overnight lows, with mid 40s to mid 50s for the coast and valleys, and 30s further inland over the mountains and far interior. Temperatures on Sunday will be a few degrees cooler for the coast and coastal valleys (as downslope warming shuts off) and 5-10 degrees warmer for the interior. ***From Previous Discussion*** Otherwise, a very quiet weather pattern now through Thanksgiving week as a high pressure ridge builds into the region.
930 PM CST Sat Nov 22 2025 - High pressure will provide dry weather and unseasonably warm temperatures through Sunday Night.
Rain and high elevation snow will stick around through today, with drier and warmer weather forecast to return this week. These rain/snow showers are from a low pressure system currently centered over southern Yuma County. Throughout the rest of the morning/afternoon, this low is projected to push towards the Four Corners, before finally exiting the area late tonight.
100 AM EST Sun Nov 23 2025 A cold front will pass through the region early this morning. A cold front is slowly moving through the forecast area bringing drier air in from the north. Highs this afternoon should range from the low 70s north to mid 70s south under sunny skies.
Dense fog remains a possibility, with the highest potential in the Boise metro area, portions of the Magic Valley, and valleys across southeast Oregon where the HREF depicts a 30-60% chance of visibilities 1/4 mile or less.
- A strong cold front brings near to below average temperatures to the area by Thanksgiving.
- Remaining dry again today before a cold front on Monday. Overnight temperatures tonight will run several degrees warmer. Impacts are still expected to remain minor with light precipitation and snow accumulation focused mainly over the higher terrain. There is still uncertainty headed into the Thanksgiving holiday travel period, as the ensemble clusters show signs of the next intermountain ridge breaking down by Thanksgiving.
630 AM EST Sun Nov 23 2025 High pressure will move across the area through Monday.
950 AM EST Sun Nov 23 2025 High pressure will build in for today and Monday.
- Cooler and drier conditions late in the week. A weak cold front will sink south across the region today with the only change being that winds will shift to the north and northwest. The front will stall across south central Florida tonight, and return north as a warm front Monday and Monday night.
Those areas that are able to clear should warm into the low-mid 60s, but more persistent clouds would hold them down considerably.
614 AM EST Sun Nov 23 2025 High pressure will build in from the north today and Monday, then move off the Mid Atlantic coast Monday night. A mid-level ridge will move east and deamplify over the southeast on Monday.
659 AM EST Sun Nov 23 2025 A cold front will pass through the region early this morning. A cold front is slowly moving through the forecast area bringing drier air in from the north. Highs this afternoon should range from the low 70s north to mid 70s south under sunny skies. Following the front from Sunday, dry high pressure will steadily fill in across the area on Monday. But the pattern is amplifying very quickly downstream of the approaching trough, so while surface dew points and PWAT's will drop back towards average, high temps will still push back above average, in the low 70's.
515 AM CST Sun Nov 23 2025 - Cooler and dry conditions will wrap up our weekend. High temperatures will be in the low 60s to low 70s on Sunday.
822 AM EST Sun Nov 23 2025 High pressure will build in from the north today and Monday, then move off the Mid Atlantic coast Monday night. A mid-level ridge will move east and deamplify over the southeast on Monday.
WEATHER PATTERN OVERVIEW: A flat upper ridge will keep conditions warm and dry today. A vigorous upper trough moves through the region for Monday. A warm front lifting across the region will bring rain in the south and snow in the north on Monday morning. As the warm front pushes north, the snow in the north will switch to rain during the afternoon. Late in the afternoon the cold front will begin to move through eastern Montana, with gusty winds and the rain changing back to snow overnight.
- A stronger cold front should push through by midweek, bringing noticeably cooler and drier conditions just in time for Thanksgiving. By afternoon, strengthening onshore flow will lift the boundary back to the north, allowing warmer and more humid air to spread inland.
529 AM EST Sun Nov 23 2025 High pressure will remain to our south today.
However, with ridging prevailing aloft and meager moisture along the atmospheric column ahead of the front, chances for any convection associated with this boundary will remain very low. Additionally, despite the brief northerly wind shift, the cooler airmass will not reach our area, and temperatures will remain warm, with highs in the low-mid 80s this afternoon.
-Deep layered ridging will ride eastward across our area over the next couple of days, keep rain chances out of the forecast in the short term.
(Tonight through Monday) Water vapor imagery shows an upper low currently over the Desert Southwest as of 11 PM.
Light showers will continue to move across the areas through the rest of the night, while a cold front west of the Cascades brings shower/light wintry mix in the Cascade region through the morning. Areas of fog continue through portions of the Basin, but some of the heavier fog has lifted to 2 to 5 miles thanks to the trough mixing the surface.
This activity is expected to continue through the early morning hours as a closed low moves through central Arizona into the Four Corners region. Late this morning into the afternoon shower activity will dissipate from west to east as synoptic scale forcing wanes with the low moving into Colorado. The low also ushers in a cooler air mass leading to high temperatures today 7-10 degrees below normal. Monday temperatures stay below normal as well, although 2-3 degrees warmer than today.
619 AM CST Sun Nov 23 2025 - Slightly cooler and drier conditions will continue Sunday with a quick warm up Monday.
423 AM EST Sun Nov 23 2025 High pressure will build in from the north Sunday and Monday, then move off the Mid Atlantic coast Monday night. A mid-level ridge will move east and deamplify over the southeast on Monday.
- Cooler and drier conditions move in for much of the week ahead. The northern slopes of the San Juans have the highest potential for an additional 4-6" of snowfall.
1002 AM EST Sun Nov 23 2025 High pressure will build in from the north today and Monday, then move off the Mid Atlantic coast Monday night. A mid-level ridge will move east and deamplify over the southeast on Monday.
1229 PM EST Sun Nov 23 2025 High pressure will prevail early this week, before a cold front impacts the area mid week. High pressure and dry weather is expected to return for Thanksgiving through late week. High pressure will continue to expand across the region through tonight, allowing for quiet and dry weather.
1005 AM EST Sun Nov 23 2025 Gusty wind expected today in the wake of a weak cold front.
1210 PM EST Sun Nov 23 2025 Slightly cooler temperatures are expected this afternoon, cooling further on Monday as high pressure passes to the north.
1253 PM EST Sun Nov 23 2025 High pressure will allow for dry conditions through Monday. Key Message: A drier and cooler air mass persists into Monday. We stay ridge dominated through the period with mostly clear skies. Strong radiational cooling tonight should allow for temps to get to the freezing mark for much of the mountains and mainly mid to upper 30s in the Piedmont.
- A warm front will move across on Monday bringing a warm and moist Gulf air mass back into the area.
(Tonight through Monday night) An upper level low is centered over Arizona with a ridge to the east extending from the Gulf to the central Great Plains. High pressure behind the front has the winds turning from east-northeasterly to southeasterly across South-Central Texas. The upper ridge over the plains will force the low to move toward the northeast into the central Plains tonight and tomorrow. At the same time a Pacific cold front will move into Texas and through our CWA. Models have decreased rain chances for tonight to 20%-40% with the higher chances across the north. With the lowest layer of the atmosphere so dry, rainfall amounts, outside of thunderstorms, will be light tonight.
1220 PM EST Sun Nov 23 2025 High pressure will build in from the north today and Monday, then move off the Mid Atlantic coast Monday night. A mid-level ridge will move east and deamplify over the southeast on Monday.
- Quick round of mountain snow tonight through Monday thanks to the same cold front bringing Monday's wind.
- Watching for a strong cold front to move through the Panhandles this coming weekend, bringing with it what could be the coldest air of the season thus far. (This afternoon through Monday night) Showers with some embedded thunderstorms are ongoing across the Panhandles as an upper-level trough approaches the area.
108 PM EST Sun Nov 23 2025 High pressure will allow for dry conditions through the day on Monday.
-Deep layered ridging will ride eastward across our area over the next couple of days, keeping rain chances out of the forecast in the short term.
Morning satellite imagery and observations indicate a broad area of low stratus and fog across the lower Treasure Valley of Oregon and Idaho. Precipitation beginning after Mon/00z, moving W-E along a cold front.
- Cooler and drier conditions late in the week. Upper trough along the Eastern Seaboard to move into the W Atlantic tonight with the weak surface front lagging behind upper support to sag over the FL Peninsula and stalling tonight.
549 PM CST Sun Nov 23 2025 - A warm front will move across on Monday bringing a warm and moist Gulf air mass back into the area.
- Cooler temps this weekend as next system approaches. Still some airmass compression going on with weak ridging in place in the wake of last week's system. Decided not to make any adjustments to high temps today in the North Bay despite persistent cloud cover keeping things cooler. Probably still remaining a bit cooler than forecast though. Tonight and tomorrow are basically persistence forecasts (copy/paste) with the weak ridge prevailing and 500 mb heights basically staying stagnant.
Updated to add areas of fog for most areas this evening and overnight, before improving after midnight from W-E with the passage of a Pacific cold front.
803 PM EST Sun Nov 23 2025 High pressure will prevail early this week, before a cold front impacts the area mid week. High pressure and dry weather is expected to return for Thanksgiving through late week. Tonight: Aloft, a weak trough currently across the Southeast United States will shift east across the nearby Atlantic, allowing modest mid-lvl ridging during the overnight period. At the sfc, high pressure will continue to expand across the region behind a front, which will continue to shift south across Southeast Georgia with time and past the Altamaha River by late evening.
647 PM EST Sun Nov 23 2025 High pressure will allow for dry conditions through Monday. Key Message: A drier and cooler air mass persists into Monday. We stay ridge dominated through the period with mostly clear skies. Strong radiational cooling tonight should allow for temps to get to the freezing mark for much of the mountains and mainly mid to upper 30s in the Piedmont.
551 PM EST Sun Nov 23 2025 High pressure will allow for dry conditions through the day on Monday.
* Although a very low chance of light rain and snow exists tonight for the Oregon border, as well as increased ridge winds through Monday.
255 PM MST Sun Nov 23 2025 KEY MESSAGES: - First winter storm of the season to impact northeast Montana - Light freezing rain possible early Monday morning before temps warm - Accumulating snowfall expected Monday evening and overnight - Wintry travel impacts possible for Thanksgiving holiday travelers WEATHER PATTERN OVERVIEW: A vigorous upper trough moves through the region for Monday. A warm front lifting across the region will bring potential for rain and light freezing rain on Monday morning. As the warm front pushes north through the morning hours temps will warm and the dominant precip type will change over to all rain by the afternoon. Late in the afternoon the cold front will begin to move through eastern Montana, with gusty winds.
529 PM CST Sun Nov 23 2025 - Fog may be a concern for tonight, especially for locations along and south of the Highway 84 corridor.
332 PM CST Sun Nov 23 2025 - Fog may be a concern for tonight, especially for locations along and south of the Highway 84 corridor.
811 PM EST Sun Nov 23 2025 High pressure will allow for dry conditions through the day on Monday.
615 PM EST Sun Nov 23 2025 Slightly cooler temperatures are expected tonight, cooling further on Monday as high pressure passes to the north.