Aikyam-Lab/Synoptic-Bench huggingface dataset:
Clouds are also on a decreasing trend today and tonight as a ridge builds over the western US. As a ridge (and Rex Block) builds over the western US, warmer temperatures are in store, with highs in the upper 30s west of the Continental Divide, and 40s and 50s east of the Divide, mid-to-late week. For reference, normal highs are in the low to middle 30s.
- Light snow possible in the WV ridges. This trough will reinforce the cold air over the area and increase low cloud cover across the north.
Cool temps settling in for tonight as high pressure over the Deep South continues advecting cool dry air mass into the state via northerly flow.
355 AM EST Sun Dec 1 2024 The region will remain between broad low pressure over southeastern Canada and high pressure building into the Mississippi and Tennessee Valleys today and tonight.
315 AM EST Sun Dec 1 2024 Chilly high pressure will build across the Southeast ahead of a dry, Arctic cold front that will move across the region Sunday night. Following Arctic high pressure will build across the Southeast through mid-week. While virga will be the most likely outcome, the passage of a reinforcing arctic cold front this evening and tonight could support a passing sprinkle across the northern Piedmont/coastal plain. A sprawling +1035mb Arctic high pressure centered over the northern/central US Plains will build SEWD through the period and will yield even colder temperatures.
This stagnant weather pattern will keep upper level ridging over the Desert Southwest over the next few days before the weak upper level low (with basically no moisture) gradually passes through during the middle of week. Even with the slight influence of the broad upper level low, our weather conditions will barely change.
Light snow or flurries possible across the higher elevations of southwest Virginia and far northeast Tennessee today and tonight. Discussion: Longwave troughing persists across the Eastern CONUS with below normal temperatures across the region. Up to one-half inch of snow will be possible today and tonight across portions of the higher elevations of Wise, Russell, and Johnson Counties, but otherwise, no precipitation or brief flurries are possible.
With current temps running a little cooler than the current forecast, decided to adjust temps downward as a result. Most of the region should see temps below freezing, with many areas falling into the upper 20s. The exception will be in our far western East Texas counties, where temps are expected to remain just above freezing. But, it will be very close in those areas, so I wouldn't be surprised to see a few isolated readings at or below freezing. With that being said, below average temperatures should remain across the region for the short-term, with lows remaining below freezing in some locations. Under clear skies, afternoon highs should generally range in the low to mid-60s.
RAP/water vapor upper level pattern indicate upper cyclone over eastern Canada while broad northwesterly flow & sfc ridging persist across the southern Plains & building into the Gulf Coast states. Broad cyclonic flow over the CONUS today is associated with an upper- level low pressure system centered over Ontario and Quebec, and additional waves digging into the broader trough will sustain this pattern into the week ahead. A rex block pattern off the West Coast should keep ridging focused over the Pacific Northwest even as the overall ridge/trough pattern slowly shifts eastward and starts to break down by the end of the new work week. Still expect widespread temperatures near or below freezing, and widespread frost is expected in all zones Sunday morning.
1243 AM EST Sun Dec 1 2024 A series of dry cold fronts will move through the area over the next couple of days.
This will subside quickly throughout the day today as this jet streak shifts east and high pressure moves in its place. The warmest areas today will be across the lower Snake into the Magic Valley and up into the valleys of the central mountains where we should reach the low to mid 40s by mid-afternoon. High pressure then becomes entrenched over the area for much of the week with not much changing from one day to the next.
December is going to start on a warm note across our forecast area as broad ridging aloft dominates our weather locally for the next couple of days.
100 AM EST Sun Dec 1 2024 Chilly high pressure will move over the region will linger through the weekend. A dry cold front Sunday night will be followed by the coldest temperatures this late Fall season. Once again updated the hourly temperatures, especially closer to dawn, to be more representative of the lows we'll be getting tonight. The sub- freezing temperatures from last night and early this morning have effectively ended the growing season - thus no frost/freeze products will be issued again until the onset of the next growing season. The large mid/upper low over eastern Canada will maintain Wly flow aloft across the Carolinas. A brief period of W-SWly winds Sunday ahead of the next dry cold front will allow temperatures to warm some with highs 52-55F for southeast NC and 54-57F for northeast SC.
(Today) Dry frontal boundary had pushed through the forecast area and will result in cooler temperatures across most locations except SE OK where the push of cooler air has slowed.
141 AM MST Sun Dec 1 2024 KEY MESSAGES: - Ridge of high pressure Sunday through at least mid week causing stable conditions. High pressure will continue to build over the Northern Rockies later today. As it does, any Pacific moisture left will ride the ridge north of the border. This ridge of high pressure will become the dominant feature over the Northern Rockies through at least mid week. High pressure will cause very stable conditions in the valleys allowing for the development of fog and low stratus.
High pressure will keep mild temperatures and dry conditions in store through the coming week. High pressure looks to largely remain in control across Arizona through much of the coming week.
- Light snow possible in the WV ridges. PoPs over the southern ridges were modified with the latest blended guidance as was cloud cover and overnight lows. This trough will reinforce the cold air over the area and increase low cloud cover across the north.
233 AM CST Sun Dec 1 2024 A weak cold front has dropped south into the state early this Sun morning behind the weak upper wave that passed overhead on Sat afternoon. a new cold front will drop SE into the state Mon afternoon. Temps look to warm well above freezing by the time any precip moves into the state to see all rain on Wed. yet another cold front will push through the state from the north. most precip potential looks to exist when temps are on the warmer side of guidance.
1231 AM EST Sun Dec 1 2024 Low pressure passing south of the region will bring light snow to areas near and south of the Ohio River tonight.
A weak short wave trough moves through the area today, though it has little to no precipitable water associated with it so conditions are expected to remain dry but with high clouds. Temperatures will be gradually warming as ridging continues over us, with Valley highs in the 60s, and upper 40s to mid 50s at higher elevations.
Lows overnight will still be quite cold but should also be a couple of degrees warmer, ranging from the low to mid 30s for most of the area. While some freezing temps are expected across the area tonight, we're opting to hold off on a freeze watch or warning since a more robust and widespread freeze is already currently ongoing.
523 AM CST Sun Dec 1 2024 (Today through Monday) Upper pattern early this morning is characterized by a large upper trough over the Great Lakes and Appalachians, with a Rex Block along the Pacific Coast. At the surface, high pressure extended from the Tennessee-North Carolina border to the Sabine River. Overall, tonight's temperatures may be a degree or two warmer than the weekend lows, which might be enough to not necessitate an additional Freeze Warning.
404 AM CST Sun Dec 1 2024 - Areas of fog this morning - Expect colder than average conditions for most of the upcoming week but it should also be dry Early morning surface map showed 1028 mb high centered over eastern NE with weak pressure rises across northeast KS as the high continues to shift southeast.
Light winds will also be the rule for most, with the exception being the Lower Colorado River Valley, where breezy northerly winds look to continue for much of the upcoming week.
954 AM EST Sun Dec 1 2024 The region will remain between broad low pressure over southeastern Canada and high pressure building into the Mississippi and Tennessee Valleys today and tonight.
504 AM CST Sun Dec 1 2024 A weak cold front has dropped south into the state early this Sun morning behind the weak upper wave that passed overhead on Sat afternoon. a new cold front will drop SE into the state Mon afternoon. Temps look to warm well above freezing by the time any precip moves into the state to see all rain on Wed. yet another cold front will push through the state from the north. most precip potential looks to exist when temps are on the warmer side of guidance.
(Today and tonight) Building high pressure across the West Coast and an upper-level low off the California Coast remains the name of the game. Aside from that, the first day of December and meteorological winter will feel anything but with temperatures up to 15 degrees above average as high pressure continues to build into place.
The latest model ensembles have the ridge strengthening as it moves onshore over the next few days along with the trough off the coast of Southern California being very weak that it dissipates at times. The weak trough also will slide east. However, the ridge also brings subsidence to our area which would be very favorable in trapping air overnight for fog and stratus to form every night the next few days. However, the ridge will help increase temperatures the next few days as latest probabilities have a 30 to 75 percent probability of high temperatures of at least 65 degrees through the week. However, the fog can potentially keep temperatures on the lower percentile range.
(Today through Monday) 500mb analysis shows a broad longwave trough across the eastern portion of the country.
Broad upper troughing along with surface ridging will continue to reinforce cold, dry, polar air over the region through the near term. Freezing overnight lows are expected to continue with lows in the 25 to 33 range, which is about 10 to 15 degrees below seasonal norms. The positive PNA pattern (W Coast ridge/E conus trough) continues to hold with some reinforcing features helping to keep it locked in. Main feature of note looks to be the ridge axis shifts eastward some by the weekend. the cool conditions will hold and look for areawide near and sub-freezing conditions each morning.
High pressure will continue to build into the area and persist through at least midweek, providing dry and stable conditions. Overall dry, subsident conditions will continue for the next several days as blocking high pressure remains dominant across the western US. This morning, Utah and southwest Wyoming remain in northwesterly flow aloft, but as the ridge axis shifts overhead this evening, this flow will lighten quite a bit. This high stability regime will result in persistent valley inversions through at least midweek, producing hazy skies, potential for air quality issues, and even nighttime fog near bodies of water.
The one exception being a backdoor cold front in the northeast keeping afternoon temperatures in the upper 40s for Monday afternoon. The southwestern two thirds of the combined Panhandles should still see afternoon highs in the lower to mid 50s, near normal.
538 AM CST Sun Dec 1 2024 - Areas of fog this morning - Expect colder than average conditions for most of the upcoming week but it should also be dry Early morning surface map showed 1028 mb high centered over eastern NE with weak pressure rises across northeast KS as the high continues to shift southeast.
*Â Freezing fog will persist into early Monday, most extensive where it has lingered for the past couple of days.
222 AM MST Sun Dec 1 2024 - Dry and relatively mild weather will continue for today and Monday, although a cold front will bring colder temperatures for the Nebraska Panhandle for Monday.
(Today through Monday) A longwave trough still remains situated across the eastern CONUS this morning and we're amidst a west-northwest flow aloft. Afternoon highs in the 50s are forecast today before we dip back into sub-freezing temperatures again tonight.
A large, deep upper trough remains over the eastern CONUS, with multiple impulses rotating through it. Another impulse rotating through the upper trough may affect the area on Monday.
608 AM CST Sun Dec 1 2024 (Today through Monday) A longwave trough still remains situated across the eastern CONUS this morning and we're amidst a west-northwest flow aloft. Afternoon highs in the 50s are forecast today before we dip back into sub-freezing temperatures again tonight.
A weak surface warming this afternoon will be followed by another cold frontal boundary moving through western Kansas This evening and Tonight.
Light snow or flurries possible across the higher elevations of southwest Virginia and far northeast Tennessee today and tonight. Discussion: Longwave troughing persists across the Eastern CONUS with below normal temperatures across the region. Up to one-half inch of snow will be possible today and tonight across portions of the higher elevations of Wise, Russell, and Johnson Counties, but otherwise, no precipitation or brief flurries are possible. Significantly cold temperatures are expected early in the week with wind chills in the single digits to near 0 across the higher elevations.
528 AM CST Sun Dec 1 2024 (Today) Dry frontal boundary had pushed through the forecast area and will result in cooler temperatures across most locations except SE OK where the push of cooler air has slowed.
535 AM CST Sun Dec 1 2024 (Today through Monday) The most recent surface analysis indicated a trough of low pressure along the east coast of Mexico and the Lower Texas Coast. During the period, this trough will ease to the west, while simultaneously, precipitable water values rise. Finally, building seas along the Lower Texas Coast will produce a moderate to high risk of rip currents at the local beaches during the entire period.
529 AM CST Sun Dec 1 2024 (Tonight through Monday night) Key Message: -Increasing rain chances Sunday night through Monday The synoptic pattern over the short term portion of the forecast has South Texas on the Lee side of a trough with quasi-zonal flow aloft. Afternoon highs today will top out in the low to mid 70s and the mid 60s to low 70s tomorrow.
(Today through Monday) The most recent surface analysis indicated a trough of low pressure along the east coast of Mexico and the Lower Texas Coast. During the period, this trough will ease to the west, while simultaneously, precipitable water values rise. Finally, building seas along the Lower Texas Coast will produce a moderate to high risk of rip currents at the local beaches during the entire period.
High pressure continues to dominate the area, bringing mostly clear skies aside from some low clouds and fog in some of the river valleys. Chilly conditions with temperatures in the 30s are being observed across most of the lower elevations early this morning. High temperatures also remain chilly as the low sun angle and strong temperature inversion prevents significant warming in narrower valleys. High temperatures could further increase into the high 60s and low 70s for the coming days here. This pattern will likely continue for the coming days as ridging stays in place through the weekend.
603 AM EST Sun Dec 1 2024 (Today through Monday) Models depict high pressure settling across the SE CONUS in the wake of a FROPA, with a dry and cooler airmass spreading over SoFlo today. Morning lows will reach some of the coldest values of the season with northern and interior areas dropping into the low-mid 40s, and mid 50s to low 60s near the coasts.
349 AM CST Sun Dec 1 2024 - Areas of freezing fog possible this morning, mainly along and west of Highway 183.
High pressure will maintain quiet and dry weather across the forecast area. Today through Monday night Current visible satellite imagery shows widespread freezing fog persisting across the Blackrock Desert in western Humboldt County, particularly along SR-140 from near Denio Junction to Kings River/Desert Valley. Additional valley locations west of US-95 may see patchy freezing fog developing early this morning. , characterized by a ridge of high pressure positioned above a weak area of low pressure to the south.
218 AM MST Sun Dec 1 2024 - Patchy freezing fog this morning will linger until around 9 AM CT this morning in Red Willow, Norton, and Graham counties. This morning, Norton, Graham, and Red Willow counties will continue seeing patchy to locally dense freezing fog in their eastern halves. Use caution traveling this morning as reduced visibility and slick spots from the freezing fog could cause issues. There is a chance (~10%) more patchy freezing fog will form overnight, but there are some limiting factors. Under the cloud deck, expect highs in the mid 30s, places with clear skies all day will warm into the lower to mid 40s. This could allow additional freezing fog to form in the eastern CWA, so we will keep an eye on that potential.
625 AM EST Sun Dec 1 2024 The region will remain between broad low pressure over southeastern Canada and high pressure building into the Mississippi and Tennessee Valleys today and tonight.
408 AM MST Sun Dec 1 2024 - Patchy freezing fog this morning will linger until around 9 AM CT this morning in Red Willow, Norton, and Graham counties. This morning, Norton, Graham, and Red Willow counties will continue seeing patchy to locally dense freezing fog in their eastern halves. Use caution traveling this morning as reduced visibility and slick spots from the freezing fog could cause issues. There is a chance (~10%) more patchy freezing fog will form overnight, but there are some limiting factors. Under the cloud deck, expect highs in the mid 30s, places with clear skies all day will warm into the lower to mid 40s. This could allow additional freezing fog to form in the eastern CWA, so we will keep an eye on that potential.
Therefore, we expect temperatures tonight to be cooler. However, the chance of rain near the coast increases by Monday evening/night thanks to the presence of a coastal trough.
410 AM MST Sun Dec 1 2024 - Dry and relatively mild weather will continue for today and Monday, although a cold front will bring colder temperatures for the Nebraska Panhandle for Monday.
(Now through Monday Night) Latest water vapor imagery shows a broad upper trough extending over much of the eastern CONUS. At the surface, high pressure continues to settle into the region, with light northerly flow and clear skies. Temperatures have fallen into the low to mid 30s for much of the area and with several more hours before sunrise, expect temps to fall below freezing areawide by daybreak. The aforementioned trough will maintain its hold on the sensible weather pattern through the near term period, with high pressure remaining at the surface.
518 AM CST Sun Dec 1 2024 (Today through Monday) Through Monday, very chilly conditions will continue with a deep longwave trough across the eastern states. The clouds have helped keep overnight temperatures warmer than last night. Passage of a surface cold front today will bring a reinforcing shot of chilly air for tonight.
Breezy winds continue early this morning for northern portions of the high country as the low over Canada continues to push east. Weak ridging begins to build in tonight. Overnight lows will be just a few degrees warmer than normal for most locations, with temperatures falling into the 20s across the plains, teens for mountain valleys, and single digits for higher terrain locations. a persistent upper pattern with upper ridging along the west coast and trough over the eastern states will keep southern Colorado under dry northwest flow through this period.
721 AM EST Sun Dec 1 2024 High pressure and a drier airmass will build into the region today into tonight. Any additional accumulations will be light, but with air temperatures below freezing and road temperatures near freezing, some slick spots will remain possible across our far southern areas. A broad upper level trough will remain in place across the Great Lakes and eastern CONUS through Monday. An embedded mid level short wave will drop down the back side of the trough through the day on Monday.
- High temperatures remain well below freezing through Monday.
532 AM CST Sun Dec 1 2024 - Areas of freezing fog possible this morning, mainly along and west of Highway 183.
High pressure will keep mild temperatures and dry conditions in store through the coming week. High pressure is centered over Arizona today, and as the axis gradually shifts east, we'll see an increase in middle and upper level cloud cover through the afternoon. High pressure looks to largely remain in control across Arizona through much of the coming week.
1251 PM EST Sun Dec 1 2024 The region will remain between broad low pressure over southeastern Canada and high pressure building into the Mississippi and Tennessee Valleys into tonight.
1046 AM EST Sun Dec 1 2024 High pressure and a drier airmass will build into the region today into tonight. A broad upper level trough will remain in place across the Great Lakes and eastern CONUS through Monday. An embedded mid level short wave will drop down the back side of the trough through the day on Monday.
1218 PM PST Sun Dec 1 2024 Patchy freezing fog may develop in Southwestern Humboldt County this evening.
High pressure and weak northwesterly flow will be in control through the end of the week. Guidance is still a bit all over the place regarding the exact track and evolution of this wave, so there is low confidence in impacts other than cooler temperatures and some breezy winds. Looking further out into the extended, models are hinting at another, stronger Pacific trough to drop through late this coming weekend or early the following week.
A short wave trough is currently pushing through the state. THe Nature Coast has dewpoint temperatures in the upper 20's, middle of the state in the low 30's, but southwest florida still seeing temperatures around 50. The cooler air will continue for Monday afternoon with highs staying in the 60's for everywhere across the CWA.
1044 AM MST Sun Dec 1 2024 - Dry and relatively mild weather will continue for today and Monday, although a cold front will bring colder temperatures for the Nebraska Panhandle for Monday.
1132 AM CST Sun Dec 1 2024 A weak cold front has dropped south into the state early this Sun morning behind the weak upper wave that passed overhead on Sat afternoon. a new cold front will drop SE into the state Mon afternoon. Temps look to warm well above freezing by the time any precip moves into the state to see all rain on Wed. yet another cold front will push through the state from the north. most precip potential looks to exist when temps are on the warmer side of guidance.
229 PM EST Sun Dec 1 2024 A dry cold front will move across the area tonight and it will be followed by the coldest temperatures so far this late Fall season.
952 AM MST Sun Dec 1 2024 - Patchy freezing fog this morning will linger until around 9 AM CT this morning in Red Willow, Norton, and Graham counties. This morning, Norton, Graham, and Red Willow counties will continue seeing patchy to locally dense freezing fog in their eastern halves. Use caution traveling this morning as reduced visibility and slick spots from the freezing fog could cause issues. There is a chance (~10%) more patchy freezing fog will form overnight, but there are some limiting factors. Under the cloud deck, expect highs in the mid 30s, places with clear skies all day will warm into the lower to mid 40s. This could allow additional freezing fog to form in the eastern CWA, so we will keep an eye on that potential.
High pressure over the western US brings mild temperatures and dry conditions through the coming workweek.