Aikyam-Lab/Synoptic-Bench huggingface dataset:
929 PM PDT Tue Sep 9 2025 A large low pressure system moving slowly into the western states will bring stronger onshore flow, spreading cooling inland and deepening the marine layer to around 3000 feet with night and morning coastal low clouds covering most of the coast and valleys for early tomorrow morning and early Thursday morning, with some areas of light drizzle possible.
1228 AM CDT Wed Sep 10 2025 - Despite the somewhat milder afternoons and cooler mornings lately, Summer returns with middle to upper 90s likely by later this week. Our region of the country remains under the influence of a subtle longwave trough across the Great Lakes into the Ohio and Lower Miss Valleys with upstream ridging noted across the Great Plains. This has allowed for cooler mornings and moderating temperatures during the afternoon to go along with low afternoon humidity, making afternoon temperatures somewhat tolerable for early September. The downstream longwave trough will lift out somewhat across the Appalachians by Thu into Fri and the upstream upper ridging mentioned above slowly migrating eastward, setting up shop across much of Oklahoma and Texas.
High temperatures will be a few degrees hotter today, mostly in the low 90s.
Northern lower will remain mostly sunny with highs in the low to mid 70s. The weak stationary boundary positioned across eastern upper will continue heavier cloud cover north of the bridge. Overnight lows for interior northern lower will drop to to upper 40s while areas near the water will remain in the low 50s along with eastern upper remaining in the 50s mainly due to lingering cloud cover.
Lows should bottom out in the mid-40s on average across the region, cooler in sheltered valleys.
(Tonight through Thursday Night) The national picture shows a ridge over the center of the nation with upper level troughs to each side. The ridge will be the main player in our wx through the next 7 days as it gradually shifts eastward and sets up from the Great Lakes to Gulf Coast. But, before the ridge axis moves overhead, there will be a couple of weak disturbances that rotate around the periphery of the ridge into the eastern trough.
- Warmer today with temperatures returning to seasonably average becoming hotter through the weekend with above average temperatures. A warming trend today under our ridge with temperatures rising to climatically seasonably average for early September.
The pattern currently features a mid-level ridge over the intermountain west and NW flow over the CWA.
The mid-levels will consist of weak troughing over the Southeast U. It'll strengthen over the entire East Coast this afternoon through the overnight in response to ridging building over the Central Plains. At the surface, High pressure will remain firmly over the East Coast, with a stationary front well to our south and southeast. The periphery of the High will continue to dominate our weather, bringing dry conditions. Highs should range from the lower to middle 80s. Quiet conditions are expected to prevail heading into the weekend, as upper level troughing deepens across the eastern CONUS.
1234 AM EDT Wed Sep 10 2025 High pressure and dry conditions will persist through much of the week. A weak mid level trough will move into the mid Ohio Valley today. Temperatures will continue to slowly moderate with highs today mainly in the lower 80s. Lows tonight will be in the low to mid 50s with highs on Thursday in the low to mid 80s.
The latest surface weather map showed a weak surface pattern overhead, with a trough stretching from eastern CO through southwestern SD and northeastern SD. A lee trough stretching from MT through WY/far southwestern SD and CO will be the focus for potential storm development.
344 AM EDT Wed Sep 10 2025 * Continued dry with temperatures climbing from the low/mid 80s into the upper 80s to low 90s by the weekend * Elevated fire weather threat as we remain dry with very warm temperatures. Our weather will remain quiet and dry but with noticeably warmer temperatures in the afternoon. Highs will be warmer but closer to seasonal normals for this time of year, in the mid to upper 80s. With warmer temperatures and some mixing in the afternoon, dew points could drop into the 40s resulting in RH values in the 20 percent range. Highs will begin to warm into the upper 80s to even to the low 90s by the end of the weekend. Upper ridge over the central plains will continue to amplify northward and expect eastward over the Ohio Valley by the weekend.
129 AM EDT Wed Sep 10 2025 High pressure maintains control over the area through much of the week, yielding a stretch of dry weather amid a subtle warming trend. Overall mainly dry conditions continue in the near term period with high pressure in control. High pressure, along with continued cool and dry conditions will linger Thursday.
(Today through Thursday) A broad mid-level ridge is centered over the Southern Plains and extends north into Canada. Surface ridging is centered over the Northeast and extends southwest into the Deep South promoting easterly to northeasterly surface flow across Central Alabama. Although the easterly flow and clear skies will provide us with a cool morning, the prominent ridging across the area will result in hot, stable conditions today. Temperatures will trend warmer tomorrow as heights rise due to a subtle eastward shift in the ridge axis, and expect to see highs in the upper 80s to lower 90s with sunny skies.
Satellite shows the low clouds and fog on a bee line for Fargo and south Cass county.
Northwest flow aloft brings another of showers and storms towards western Kansas this morning while the upper ridge enters the western high plains. Nose of the low level jet extends into southwest Kansas as veering winds to the southwest shift the MCS to the southeast. Cloud cover and possible rain showers could cool highs down to the upper 70s dependent upon timing, albeit most areas should reach the lower 80s. Later this evening into the overnight period, an additional embedded perturbation rounds the progressing upper ridge, developing a low chance (20%) of scattered showers and storms over central and east central Kansas once again. Thermal ridge spreads northeastward Thursday into the weekend as h85 temps peak in the 20-25C range amid gusty southerly winds each afternoon from 10 to 20 mph.
The synoptic pattern is defined by stout mid to upper level ridging in the western U. with troughing prominent across the southeast U. Going into the afternoon, the stout mid to upper level ridging continues its eastward track towards our area. A H850 thermal ridge shifts farther east bringing H850 temperatures near 70 degrees F. As mid to upper level ridging continues to approach the area, expect temperatures to continue to warm. Thursday, highs in the upper 80s become more widespread with a few areas south of I-70 possibly reaching the low 90s.
1009 PM PDT Tue Sep 9 2025 * A low pressure system will bring breezy winds, cooler temperatures, and dry conditions to the Desert Southwest this week.
Although there will likely be a lapse in WAA on Thursday as low-level flow briefly becomes very weak, greater insolation will act to maintain the warming trend with high temperatures another couple degrees F warmer.
A stalled frontal boundary remains stretched across the Florida Peninsula, terminating in the weak area of low pressure that has been spinning over the Gulf all week. Through the rest of the week and into the weekend, an upper level trough digging into the southeastern US will give the frontal boundary a push to the south, allowing drier air to spread in across the forecast area.
As ridging develops in the Central Plains, there is some potential for another round of sprinkles tonight into tomorrow as a weak area of vorticity rounds the trough (subsequently strengthening over the Mid-Atlantic), but model agreement is lacking so will hold off on their inclusion for the time being.
pdf High pressure to the north will weaken Today, as the frontal zone to the south sinks a little further south. Lows in the lower 60s over inland SE GA, to the middle 70s coastal NE FL are expected.
Late today, surface ridging extends southwestward near the eastern slope of the Appalachians and continues to sustain our dry air mass. Aloft, flow is weak and a sizable but weak trough is situated roughly over the Mississippi Valley late today. The trough will very slowly move east and be over our area late Wednesday night. A disturbance moving across the area in northwesterly flow aloft Thursday will push a frontal boundary south and east across the Lower Ohio and Tennessee Valleys, with better moisture and instability grazing our forecast area to the west as it moves south. For now, given the high uncertainty, will just let the NBM ride for the PoP forecast, which now keeps any mention of precipitation below the 15 percent threshold needed for mention in the point-and-click and text forecasts.
This will be the result of an upper level low currently centered over far northern California that will slowly drift east through Thursday. The low will be accompanied by abundant moisture with precipitable water values rising to the 80th to 90th percentile. Ahead of this low, showers and isolated thunderstorms will develop over the central ID mountains this evening before tapering off. The first will be near the low center across central Oregon, where cooler temperatures will allow for widespread showers and embedded thunderstorms capable of heavy rainfall. Showers and thunderstorms will continue over our area Wednesday night and Thursday as the low slowly moves overhead. The focus for significant precipitation should be near the low center across SE Oregon, as well as the mountains of SW Idaho.
141 AM EDT Wed Sep 10 2025 Dry weather will continue through the end of the week as high pressure remains in control from the Ohio Valley to the eastern Great Lakes. Heading into Thursday morning, a weak cold front will lie overhead of the forecast area dropping southeastward across New York State.
317 AM EDT Wed Sep 10 2025 High pressure maintains control over the area through much of the week, yielding a stretch of dry weather amid a subtle warming trend. An upper level trough that moves east into the area today may prompt an increase in cloud cover, though drier conditions are expected to continue thanks to persistent high pressure and dry air at the surface. Seasonable temperatures should range from mid 70s to low 80s in the lowlands and mid 60s to 70s in the mountains.
614 AM EDT Wed Sep 10 2025 High pressure maintains control over the area through much of the week, yielding a stretch of dry weather amid a subtle warming trend. An upper level trough that moves east into the area today may prompt an increase in cloud cover, though drier conditions are expected to continue thanks to persistent high pressure and dry air at the surface. Seasonable temperatures should range from mid 70s to low 80s in the lowlands and mid 60s to 70s in the mountains.
745 AM EDT Wed Sep 10 2025 (Today and tonight) Troughing over the eastern CONUS is forecast to continue today with northeasterly winds remaining at the surface. Lows overnight are forecast in the low to mid 60s inland and the upper 60s near the coast.
252 AM PDT Wed Sep 10 2025 * A low pressure system will bring gusty winds, cooler temperatures, and dry conditions to the Desert Southwest this week.
844 AM EDT Wed Sep 10 2025 * Continued dry with temperatures climbing from the low/mid 80s into the upper 80s to low 90s by the weekend * Elevated fire weather threat as we remain dry with very warm temperatures. Our weather will remain quiet and dry but with noticeably warmer temperatures in the afternoon. Highs will be warmer but closer to seasonal normals for this time of year, in the mid to upper 80s. With warmer temperatures and some mixing in the afternoon, dew points could drop into the 40s resulting in RH values in the 20 percent range. Highs will begin to warm into the upper 80s to even to the low 90s by the end of the weekend. Upper ridge over the central plains will continue to amplify northward and expect eastward over the Ohio Valley by the weekend.
726 AM EDT Wed Sep 10 2025 High pressure continues to move east into the southern Maritimes today. A cold front will cross the region Thursday.
The good mixing under the upper ridge will help push temperatures across south central SD about 10 degrees above climo norms today and Thursday. Thursday evening, the axis of the upper level ridge has passed and the area is in southwestern flow.
Upper level ridge axis is centered across the southern and central plains today downstream of a upper trough digging along the west coast. At the surface, leeward troughing will deepen ahead of the western U. trough. This seems reasonable given the upper ridge axis across the area. The exception could be across far northwest Nebraska this evening, where a cluster of showers/thunder could clip that area as it moves northeast off the higher terrain of Wyoming. The ridge axis begins to shift eastward slightly Thursday as the upper trough inches slowly eastward across the western CONUS. South to southeast low-level flow continues as leeward troughing remains established across the far western high plains. Southwest flow aloft will increase some across western Nebraska as the upper trough continues to move slowly eastward toward the area.
321 AM PDT Wed Sep 10 2025 A low pressure system moving slowly into the western states will continue to spread cooling inland with high temperatures for inland areas 10 to 15 degrees below average for today and Thursday.
As the upper level trough just east of us continues shifting east our CWA wl become more under the influence of the large upper level high to our west. Wl also maintain surface ridging from the northeast. Together these features will allow temperatures to top out warmer than normal and no rain chances are anticipated today. High temperatures will be a few degrees hotter today, mostly in the low 90s.
600 AM EDT Wed Sep 10 2025 High pressure and dry conditions will persist through much of the week. A weak mid level trough will move into the mid Ohio Valley today. Temperatures will continue to slowly moderate with highs today mainly in the lower 80s. Lows tonight will be in the low to mid 50s with highs on Thursday in the low to mid 80s.
Quick update to expand the Coastal Flood Advisory to include the lower SC coast and the southeast GA coast. The mid-levels will consist of weak troughing over the Southeast U. It'll strengthen over the entire East Coast this afternoon through the overnight in response to ridging building over the Central Plains. At the surface, High pressure will remain firmly over the East Coast, with a stationary front well to our south and southeast. The periphery of the High will continue to dominate our weather, bringing dry conditions. Highs should range from the lower to middle 80s. Quiet conditions are expected to prevail heading into the weekend, as upper level troughing deepens across the eastern CONUS.
/Issued 1218 AM CDT Wed Sep 10 2025/ /Through Thursday Night/ As high pressure settles across the Southern Plains, slightly warmer temperatures are expected today compared to yesterday. Another 2-4 degree increase is expected on Thursday compared to today with continued strengthening of the high pressure system.
605 AM CDT Wed Sep 10 2025 (Today through Thursday) A broad mid-level ridge is centered over the Southern Plains and extends north into Canada. Surface ridging is centered over the Northeast and extends southwest into the Deep South promoting easterly to northeasterly surface flow across Central Alabama. Although the easterly flow and clear skies will provide us with a cool morning, the prominent ridging across the area will result in hot, stable conditions today. Temperatures will trend warmer tomorrow as heights rise due to a subtle eastward shift in the ridge axis, and expect to see highs in the upper 80s to lower 90s with sunny skies.
* Continued dry with temperatures climbing from the low/mid 80s into the upper 80s to low 90s by the weekend * Elevated fire weather threat as we remain dry with very warm temperatures. Our weather will remain quiet and dry but with noticeably warmer temperatures in the afternoon. Highs will be warmer but closer to seasonal normals for this time of year, in the mid to upper 80s. With warmer temperatures and some mixing in the afternoon, dew points could drop into the 40s resulting in RH values in the 20 percent range. Highs will begin to warm into the upper 80s to even to the low 90s by the end of the weekend. Upper ridge over the central plains will continue to amplify northward and expect eastward over the Ohio Valley by the weekend.
629 AM EDT Wed Sep 10 2025 High pressure will dominate the weather pattern through the next seven days with dry conditions and near to above normal daytime temperatures. The region will remain positioned along the eastern periphery of an upper level trough. At the surface, strong ridging will continue to build down along the lee of the Appalachians, resulting in a northerly flow. High temperatures will be slightly below normal, in the lower to mid 80s. Key message(s): - Surface ridging and calm weather expected throughout the middle of the week.
(Today and tonight) Troughing over the eastern CONUS is forecast to continue today with northeasterly winds remaining at the surface. Lows overnight are forecast in the low to mid 60s inland and the upper 60s near the coast.
307 AM PDT Wed Sep 10 2025 * A low pressure system will bring gusty winds, cooler temperatures, and dry conditions to the Desert Southwest this week.
619 AM CDT Wed Sep 10 2025 - Despite the somewhat milder afternoons and cooler mornings lately, Summer returns with middle to upper 90s likely by later this week. Our region of the country remains under the influence of a subtle longwave trough across the Great Lakes into the Ohio and Lower Miss Valleys with upstream ridging noted across the Great Plains. This has allowed for cooler mornings and moderating temperatures during the afternoon to go along with low afternoon humidity, making afternoon temperatures somewhat tolerable for early September. The downstream longwave trough will lift out somewhat across the Appalachians by Thu into Fri and the upstream upper ridging mentioned above slowly migrating eastward, setting up shop across much of Oklahoma and Texas.
540 AM EDT Wed Sep 10 2025 Dry weather will continue through the end of the week as high pressure remains in control from the Ohio Valley to the eastern Great Lakes. Heading into Thursday morning, a weak cold front will lie overhead of the forecast area dropping southeastward across New York State.
835 AM EDT Wed Sep 10 2025 A stalled frontal boundary remains stretched across the Florida Peninsula, terminating in the weak area of low pressure that has been spinning over the Gulf all week. Through the rest of the week and into the weekend, an upper level trough digging into the southeastern US will give the frontal boundary a push to the south, allowing drier air to spread in across the forecast area.
1032 AM EDT Wed Sep 10 2025 Canadian high pressure remains situated to our north this afternoon as a wave of low pressure passes offshore to the southeast. A dry front will dissipate as it approaches on Thursday, then another area of Canadian high pressure will drift toward New England this weekend, resulting in continued dry conditions. Low pressure developing off of the Carolina Coast continues to send moisture, low clouds, drizzle and patchy fog westward into the eastern half of our region. With the aforementioned, high temperatures will be nearly 10 degrees below average with highs reaching the lower to middle 70s.
208 PM EDT Wed Sep 10 2025 High pressure will aid in quiet and predominantly dry weather through the forecast period. Broad area of low pressure offshore maintains northerly flow across the region. Slow clearing should occur on Thursday with highs in the low 80s with some late-day peeks of sunshine. Despite an upr-level trough pivoting through the area, mid and upper levels remain quite dry, so anticipating mainly mostly sunny/clear skies, partly cloudy near the coast Thursday night.
(Rest of Today and Tonight) Tranquil weather across the Tennessee Valley late this morning, with high pressure promoting clear/sunny and calm conditions. Clear conditions this evening and overnight will allow for good radiational cooling as temperatures drop off quickly after sunset, eventually settling into the low tom mid 60s.
112 PM PDT Wed Sep 10 2025 * A low pressure system will bring gusty winds and cooler temperatures to the region over the next few days.
A cold front will cross north of the area tonight.
1216 PM CDT Wed Sep 10 2025 (Rest of Today and Tonight) Tranquil weather across the Tennessee Valley late this morning, with high pressure promoting clear/sunny and calm conditions. Clear conditions this evening and overnight will allow for good radiational cooling as temperatures drop off quickly after sunset, eventually settling into the low tom mid 60s.
- No appreciable rain chances are on the horizon as upper-level ridging will continue to dominate the region. This is certainly more reminiscent of a mid-summer regime dominated by an upper-level ridge will only expand deeper into our region as we move through the end of this week and into the upcoming weekend. This upper ridge will serve to deflect any progressive disturbances or frontal boundaries attempting to shift south toward our region, keeping us rain-free with above average temperatures for the foreseeable future.
1219 PM CDT Wed Sep 10 2025 As the upper level trough just east of us continues shifting east our CWA wl become more under the influence of the large upper level high to our west. Wl also maintain surface ridging from the northeast. Together these features will allow temperatures to top out warmer than normal and no rain chances are anticipated today. High temperatures will be a few degrees hotter today, mostly in the low 90s.
As weak disturbances traversing the periphery of high pressure aloft interact with these ingredients, isolated to scattered showers and thunderstorms are expected each day.
A troughing pattern continues over our area heading into Thursday, with the HREF picking up on a very low chance of a stray shower. Meanwhile, temperatures will be increasing with highs today reaching into the mid- and upper-80s and then getting into the low-90s for some locations on Thursday. (Thursday Night through next Wednesday) A large upper-level ridge will be strengthening over the Plains this week, and as we head into the weekend, this ridge of high pressure will be shifting to the east.
924 AM MDT Wed Sep 10 2025 A closed low over northern California this morning is approaching the region today and will bring widespread showers and scattered thunderstorms.
Isolated to scattered rain showers continue to taper off across the area this afternoon as an upper level disturbance passes south into the Lower Michigan. Fog will remain a concern going into the overnight hours, particularly across the western half as the near surface environment remains conducive and subsidence begins to increase as high pressure builds in from the west. Thinking lows will only drop down into the mid 50s in most locations tonight as ridging starts to build in and abundant cloud cover remains overhead. Thursday looks to be a dry day as high pressure continues to build over the Plains and into the Upper Midwest.
Satellite imagery is showing the core of the upper low over NorCal currently. These will expand in coverage to the north and west around the low's circulation today, but with the axis of activity a bit farther east compared to yesterday. This poses a marginal risk (5-15%) for excessive rainfall that could lead to flash flooding, but the risk remains on the low side for any flash flood products. Temperatures will be similar to today, perhaps a few degrees warmer where clouds are fewer compared to today.
201 PM EDT Wed Sep 10 2025 High pressure remains in control with sunny skies and seasonable temperatures through the end of the week.