Aikyam-Lab/Synoptic-Bench huggingface dataset:
Overnight low temperatures will consequently range considerably, from the middle 40s south and west to near freezing again north and east, where temperatures will still have most of the night to plummet before cloud cover arrives. Guidance is split considerably on high temperatures Wednesday, ranging from the lower 50s to lower 60s. NBM looks to split the difference, and have elected to follow suit, aiming for highs ranging from the lower 50s north to lower 60s south, followed by lows in the middle 30s north to lower 50s south overnight into Thursday, while rainfall begins to come to an end from northwest to southeast.
1102 PM CST Tue Dec 3 2024 - Cold temperatures return Thursday, highs below freezing, along with breezy northwest winds Wednesday night into Thursday.
914 PM PST Tue Dec 3 2024 Cooler Wednesday as an upper level low moves over.
1131 PM CST Tue Dec 3 2024 (Tonight) High pressure at the surface promoting clear and calm conditions tonight across the Tennessee Valley. A good night for radiational cooling in this cold/dry air mass will drop temperatures into the lower 20s in most locations by early Wednesday morning -- with a few locations dropping into the upper Teens in a few sheltered valley locations. (Wednesday through Thursday Night) The models still indicate a powerful upper trough digging through the lower Great Lakes driving another Arctic front southeast into the region Wednesday night.
In the upper levels, the deep trough that brought the recent cold airmass into Florida is shifting east into the Atlantic today, with another trough forecast to dig into the Great Lakes and Upper Midwest from Canada during the rest of the week. At the surface, broad high pressure north of Florida will settle south tonight and Thursday, bringing light flow and an end to the cold air advection and allowing temperatures to finally moderate. By Thursday night, the next trough will be bringing a weak cold front into the Florida Peninsula.
Currently - A cooler night is taking shape across the Keys this evening. The exception is a more veered flow in portions of the Lower Keys leading to a weakened decoupled flow. With that said, the decoupling already occurring in parts of the Lower Keys may result in the coolest temperatures early in the night in the upper 50s and light breezes early. The specifics of wind direction and speed will be highly dependent on how much the pressure gradient decreases as the high spreads southeastward, the persistence and interaction of a mainland land breeze with cooling nearshore waters. There is quite a bit of uncertainty with winds due to nocturnal decoupling occurring, particularly in the Lower Keys.
At the surface, a high pressure system will slide to the east, bringing a southerly return flow to the region tonight into tomorrow. However, it will not last, as another cold front will be dropping down from the NW. Cooler air will be in place behind the front, and highs on Thursday will be topping out in the 30's across the north , with highs near 50 across the far south.
Additional rounds of showers and thunderstorms are forecast from Thursday morning through the evening hours as the warm front lifts north into the CWA ahead of another cold front expected to sink south.
A cold front will move through the region tonight with rain showers developing ahead of the front this afternoon and tonight.
313 AM MST Wed Dec 4 2024 - Lots of Sun today, but temps a bit cooler over the region.
317 AM CST Wed Dec 4 2024 - A much warmer and windy day is on tap with highs as much as 5-10 degrees above normal. - A potent cold front accompanied by strong and gusty northwest will bring a dramatic temperature drop tonight and return the area to a winter feel.
529 AM CST Wed Dec 4 2024 (Tonight through Thursday night) The synoptic pattern for the next few days will feature a low to the northeast and another one west with the southern Plains under a low amplitude ridge. A weak lower level disturbance and a warm front that's in the vicinity will keep rain chances in the forecast for now. Afternoon temperatures today will top out in the mid 70s across the region and around the low 70s for tomorrow under mostly cloudy skies.
(Today and tonight) Cooler and moister conditions in addition to the lack of cloud cover is allowing for fog to be observed in greater extent than it was 24 hours ago with North Bay Valleys and Monterey Bay being the victims thus far. Above normal temperatures and dry conditions will continue as longwave ridging remains parked over the region.
This will maintain large scale upper ridging across the Pacific Northwest with a trapped upper low over the Desert Southwest.
- Cooler temperatures on Thursday, with highs ranging from the upper 30s (east) to upper 40s (west).
416 AM CST Wed Dec 4 2024 - Due to mild evening temperaturs (above 32F in eastern ND and the Red River valley) and some light drizzle, freezing drizzle, the snow on the ground has become likely less blowable. Cold front located from near Baudette to near Fosston to just north of Fargo to between Valley City and Cooperstown at 09z. Initial drizzle ahead of the front in warmer air with mid 30s in SE ND and WC MN.
Upper ridging will continue across the western CONUS today, then begin to break down on Thursday. Warmer westerly flow will overtake the cold air on Thursday. Temps may end up being warmer than NBM guidance.
Fog/freezing fog will continue in west side valleys and near Klamath Falls until the late morning when improvements come.
217 AM MST Wed Dec 4 2024 - A bit cooler on the plains today.
512 AM CST Wed Dec 4 2024 - A much warmer and windy day is on tap with highs as much as 5-10 degrees above normal. - A potent cold front accompanied by strong and gusty northwest will bring a dramatic temperature drop tonight and return the area to a winter feel.
A strong ridge of high pressure is firmly in place. The ridge will further amplify late this week, and daytime highs will be warm, pleasant and much above climatological averages.
The culprit is the blocked up flow over the western CONUS with a weak upper low over the Golden State and high pressure over the PacNW.
Cold front located from near Baudette to near Fosston to just north of Fargo to between Valley City and Cooperstown at 09z. Initial drizzle ahead of the front in warmer air with mid 30s in SE ND and WC MN.
- A cold front continues to cause rapid temperatures falls across the state resulting in a flash freeze.
Early this morning, a cold front is about to enter northern Kansas.
554 AM CST Wed Dec 4 2024 - Due to mild evening temperatures (above 32F in eastern ND and the Red River valley) and some light drizzle, freezing drizzle, the snow on the ground has become likely less blowable. The warm air advection through the night coupled with periods of freezing drizzle and some areas of freezing rain have crusted over most of our blowable snowpack. Cold front located from near Baudette to near Fosston to just north of Fargo to between Valley City and Cooperstown at 09z. Initial drizzle ahead of the front in warmer air with mid 30s in SE ND and WC MN. However, with the freezing drizzle and warm temperatures earlier in the night.
254 AM MST Wed Dec 4 2024 Overall tranquil conditions are expected to persist over the Desert Southwest through the rest of this week despite a very weak low pressure system affecting the region.
542 AM CST Wed Dec 4 2024 - Warmer today with milder highs in the upper 50s. The temperature rollercoaster continues for early December with an upside day behind a pre-frontal surface trof with highs generally in the upper half of the 50s. This will be followed by a strong cold front late tonight in response to a vigorous upper trof diving southward across the Great Lakes. The eastern conus upper trof will slide eastward off the Atlantic coast as we head into the start of the weekend with subtle ridging over the Plains downstream of the southern branch upper low over southeast Arizona/northern Mexico.
A strong upper low dropping south from western Ontario to Lake Superior will produce strong upper diffluence, steepening lapse rates and push a cold front across the region today.
218 AM PST Wed Dec 4 2024 * Strong valley inversions continue at least into the start of the weekend with areas of freezing fog redeveloping each night. With this setup, light winds will persist across the region for the rest of the week as high pressure in the area allows the stagnant conditions to linger. Cooler overnight lows in teens and 20s are seen the valleys while mid-slope and ridgeline areas may stay around the freezing mark. The overnight redevelopment of freezing fog is expected in the same valley areas that have seen these conditions over the past few days such as those areas from the Honey Lake basin into Pyramid Lake as well as adjacent desert basins. Another Freezing Fog Advisory continues through this morning in these areas.
524 AM CST Wed Dec 4 2024 (Today) Temperatures will warm above normal today across most of the area, with the only exception across far southeast Oklahoma where thicker cloud cover and the potential for a few light showers will keep temperatures cooler. An initial wind shift will move into northeast Oklahoma this afternoon, but the main cold front will remain north through the day today.
431 AM MST Wed Dec 4 2024 - Lots of Sun today, but temps a bit cooler over the region.
515 AM CST Wed Dec 4 2024 - Warmer temperatures Wednesday ahead of the next cold front.
Overall tranquil conditions are expected to persist over the Desert Southwest through the rest of this week despite a very weak low pressure system affecting the region.
As of early this morning, GOES-West satellite imagery shows clear skies across interior NorCal as ridging aloft continues to amplify over the Pacific Northwest. Despite the amplifying ridge to the north, the weather pattern is expected to remain largely unchanged across interior NorCal today. Downslope winds look to remain breezy along the higher elevations, with generally light north to east winds expected elsewhere.
539 AM CST Wed Dec 4 2024 A cold front will move through the region tonight with rain showers developing ahead of the front this afternoon and tonight.
- Much colder Thursday following cold frontal passage. - Warmer over the weekend with rain chances returning southeast of Interstate 44. (Today) Temperatures will warm above normal today across most of the area, with the only exception across far southeast Oklahoma where thicker cloud cover and the potential for a few light showers will keep temperatures cooler. An initial wind shift will move into northeast Oklahoma this afternoon, but the main cold front will remain north through the day today.
1124 AM CST Wed Dec 4 2024 (Tonight through Thursday night) The synoptic pattern for the next few days will feature a low to the northeast and another one west with the southern Plains under a low amplitude ridge. A weak lower level disturbance and a warm front that's in the vicinity will keep rain chances in the forecast for now. Afternoon temperatures today will top out in the mid 70s across the region and around the low 70s for tomorrow under mostly cloudy skies.
Due to the amplitude of the ridge, winds will be lightly breezy at times this afternoon. A strong low over the Great Lakes will weaken this ridge over the next couple days, and the ridge is strong enough to act as a "blocker" to prevent the trough from penetrating into South Florida. Therefore, flow will become more zonal for Wednesday with lighter and more variable winds as the region will be underneath weaker high pressure. High temperatures today are expected in the low to mid 70s.
High winds possible tonight across the higher elevations, so Wind Advisory in effect across east Tennessee mountains and added three northern counties in Southwest Virginia. Discussion: A much warmer day today after some morning and early afternoon cloud cover. Strong southwest winds were bringing in a warmer airmass. For tonight a strong low pressure system across the northern Great Lakes brings a cold front southeast tonight and Thursday with very strong 850mb gradient westerly winds around 50 kt. The orographic lift behind the cold front will produce light snow or flurries across the mountains through Thursday morning.
1241 PM MST Wed Dec 4 2024 - Dry and warmer than normal conditions will persist into the weekend.
1105 AM CST Wed Dec 4 2024 - A much warmer and windy day is on tap with highs as much as 5-10 degrees above normal. - A potent cold front accompanied by strong and gusty northwest will bring a dramatic temperature drop tonight and return the area to a winter feel.
1231 PM CST Wed Dec 4 2024 (Rest of Today) After a chilly start to the morning, temperatures have warmed above the freezing mark as skies remain clear across the area. Afternoon highs will reach the low to mid 50s across the area.
1135 AM CST Wed Dec 4 2024 - Warmer today with milder highs in the upper 50s. The temperature rollercoaster continues for early December with an upside day behind a pre-frontal surface trof with highs generally in the upper half of the 50s. This will be followed by a strong cold front late tonight in response to a vigorous upper trof diving southward across the Great Lakes. The eastern conus upper trof will slide eastward off the Atlantic coast as we head into the start of the weekend with subtle ridging over the Plains downstream of the southern branch upper low over southeast Arizona/northern Mexico.
256 PM CST Wed Dec 4 2024 - There is a low (20-30%) chance that a band of briefly moderate snow accompanies a cold front this evening north of a roughly Macomb to Robinson line. A pre-frontal trough continues to move east through eastern Illinois this afternoon while the main cold front moves into northwestern Illinois and will continue to move through the CWA this evening. Dynamics associated with the cold front this evening are sufficient for rain or snow showers. Dry weather is then expected Thur into Thur night as high pressure builds into the area. This high pressie will be a cold one and below normal temps area expected tonight through tomorrow night.
238 PM CST Wed Dec 4 2024 - Potent cold front will bring strong northwest winds (35-50+ mph gusts) and areas of blowing/drifting snow (Glacial Lakes region) until sunset.
1126 AM CST Wed Dec 4 2024 (The rest of today ) Temperatures will warm above normal this afternoon across most of the area, with the only exception across far southeast Oklahoma where thicker cloud cover and a few light showers will keep temperatures cooler. An initial wind shift will move into northeast Oklahoma this afternoon, but the main cold front will remain north until the very late evening to overnight hours.
Winds will continue to build the remainder of the afternoon with the highest wind gusts of 45 mph (up to 50 mph is possible) from 4 to 9 PM. Any accumulations look to be under an inch but with temperatures eventually dropping below freezing, the potential for slick spots developing on untreated roads, bridges, parking lots and sidewalks is very high.
1139 AM CST Wed Dec 4 2024 A cold front will move through the region tonight with rain showers developing ahead of the front this afternoon and tonight.
153 PM MST Wed Dec 4 2024 - Cold front sagging southward this afternoon with breezy winds and cooler temperatures behind it.
Overnight lows will be warmer than previous nights, falling into the low to mid 30s. There is a very low chance that temperatures may cool enough in the higher terrain of NE AL and southern middle TN to result in a few flakes of snow early tomorrow morning, but no impacts are expected.
Lowering cloud bases and increased rain chances are expected, especially well after midnight, and even more so by sunrise Thursday as a cold front approaches.
Highs are expected to reach around 50 on the Plateau and low to mid 50s elsewhere this afternoon thanks to strong WAA occurring ahead of a potent cold front that will sweep through the area tonight. Another round of isolated light rain is possible on and near the Plateau overnight as the cold front pushes across.
1025 AM MST Wed Dec 4 2024 - Lots of Sun today, but temps a bit cooler over the region.
1119 AM CST Wed Dec 4 2024 - Warmer temperatures Wednesday ahead of the next cold front.
Post-frontal conditions will consist of some clearing from the north through the morning and early afternoon Thursday as winds become northeasterly and pick up in speed, while temperatures climb only into the lower 50s north to upper 50s south. Dry conditions look to prevail, continuing overnight, while temperatures plunge back to subfreezing values for much of the region, from the freezing mark across east Texas to the middle 20s in southwestern Arkansas.
835 AM MST Wed Dec 4 2024 - A bit cooler on the plains today.
This will help the temperatures moderate and keep the low temperatures around the lower to upper 40s with a few areas in northern Levy County still possibly dropping just below 40.
(The rest of today ) Temperatures will warm above normal this afternoon across most of the area, with the only exception across far southeast Oklahoma where thicker cloud cover and a few light showers will keep temperatures cooler. An initial wind shift will move into northeast Oklahoma this afternoon, but the main cold front will remain north until the very late evening to overnight hours.
High pressure over the Southeast weakens and drifts eastward through Thursday, as a cold front drags through the Deep South. Morning low temperatures are forecast in the upper 40s to lower 50s, though rural, normally cooler locations should still see the mid-40s. Afternoon high temperatures are forecast in the lower to mid-70s, which is near normal for this time of year.
W-WNW upper flow is ongoing in the base of a trough over the E U. At the surface, a high pressure ridge centered just S of the County Warning Area (CWA) will be shunted SE as a cold front sweeps across the area late tonight and on Thursday. Early afternoon temperatures today range from near 40 in the NE mountains to the lower 50s in the S. Overnight lows tonight will be warmer than last nights, ranging from near freezing in the NE mountains to near 40 in the S. Colder air will begin filtering in behind the cold front on Thursday. As a result, highs across the N will be cooler than today's, while highs across the S will be a bit warmer. The cold front will exit the area before sunset Thursday.
220 PM CST Wed Dec 4 2024 -Much cooler and drier weather arrives tonight.
Today through Thursday night Dry conditions, warmer weather, and light winds forecast for Nevada through tomorrow night due to high pressure. High pressure will expand eastward today and tomorrow. Highs in the lower 50s forecast, which will be around 10 degrees higher than normal for this time of year.
An Arctic blast of cold air is expected late this week before the pattern trends warmer and wetter.
1213 PM CST Wed Dec 4 2024 - An Arctic front brings a period of freezing drizzle this morning, followed by plummeting temperatures, strong winds, and a few snow showers this afternoon. - Temperatures trend warmer into the weekend. Therefore, with the aid of lift and the lowest 5kft reaching near saturation, drizzle or freezing drizzle is expected depending on the surface wetbulb and ground temps. Ground temperatures are cold now, and not likely to warm much even with above freezing air temperatures, so freezing drizzle appears most likely. The freezing drizzle threat will end and transition to snow showers, flurries, or dry conditions. High pressure will slide south Thursday and by Thursday night return flow will already begin.
1000 AM PST Wed Dec 4 2024 High pressure aloft and developing weak offshore flow will bring well above average high temperatures in inland areas through this weekend.
Upper low continues to dig into WI, with northwesterly surface winds, cold air advection, and periodic snow showers continuing on the backside of the departing system across our area. Some strong warm air advection for the weekend as flow shifts to a more southwesterly direction ahead of the next upper trough.
pdf With high pressure building over the forecast areas winds will go calm to light and variable overnight with clear skies. I did undercut the Model Guidance in the areas from Jesup to Trenton and west of Tail Ridge by about 2-4F but with a bit drier conditions chose to go with Patchy Frost rather than Areas of frost for the interior areas.
A routine forecast, with temperatures rebounding into the lower 70s, seems on track.
There is a low pressure system heading to the Great Lakes region with an upper level southern portion positioned over the Desert Southwest; a ridge is off to the north of that southern portion over the Pacific Northwest. Cooler air will infiltrate in behind a cold front associated with the system tracking south to the Great Lakes region; this front should move through tonight into Thursday. Overnight low temperatures are forecast to drop just a bit below seasonal normal with values in the low to mid 20s.
240 PM EST Wed Dec 4 2024 A strong cold front will move through the Ohio Valley tonight, providing a few snow showers, much colder temperatures and gusty winds into Thursday.
209 PM CST Wed Dec 4 2024 - A cold front moves through tonight, causing wind chill values to plummet into the single digits by Thursday morning.
The low clouds are slowly burning off, but those areas should break out late in the day before becoming socked in again early this evening. Weak upper troughing will approach the area from the west tonight, but it will weaken as it runs into the upper ridge. This should keep temperatures from dropping down below freezing. Farther south, in portions of the Rogue parts of the Illinois, Shasta, and Scott Valleys, the cloud cover may not be sufficient enough to keep temperatures from dropping below freezing, so we could be dealing with another round of freezing fog later Wednesday night into Thursday morning. Areas that experience freezing fog will result in low visibility along with slick driving conditions for the early morning commute, especially on bridges and any other elevated roads because of not warming from the ground below.
551 PM CST Wed Dec 4 2024 - There is a low (20-30%) chance that a band of briefly moderate snow accompanies a cold front this evening north of a roughly Macomb to Robinson line. A pre-frontal trough continues to move east through eastern Illinois this afternoon while the main cold front moves into northwestern Illinois and will continue to move through the CWA this evening. Dynamics associated with the cold front this evening are sufficient for rain or snow showers. Dry weather is then expected Thur into Thur night as high pressure builds into the area. This high pressie will be a cold one and below normal temps area expected tonight through tomorrow night.
526 PM CST Wed Dec 4 2024 -Much cooler and drier weather arrives tonight.
937 PM EST Wed Dec 4 2024 A strong cold front will cross the region tonight, providing a few rain showers, mixing with snow showers before ending.
There are a few others along the highway 2 corridor from Crookston through Lakota. These extend down through the highway 200 and Interstate 94 corridor as well. Upper low continues to dig into WI, with northwesterly surface winds, cold air advection, and periodic snow showers continuing on the backside of the departing system across our area. Some strong warm air advection for the weekend as flow shifts to a more southwesterly direction ahead of the next upper trough.
Long range forecast bring cooler and wetter conditions toward the middle of December. (This evening through Thursday) Near term, wall to wall sunshine blankets the Bay Area this afternoon thanks to high pressure overhead. Curious looking longwave pattern as low pressure mains over the Desert SW, low pressure approaching the PacNW, and the Bay Area sandwiched in between.
The moderating trend has gotten underway as high pressure has settled over the area. This high will be suppressed further south Thursday with a southwest to west flow developing as the next cold front moves through the southeast states.
558 PM CST Wed Dec 4 2024 - Potent cold front will bring strong northwest winds (35-50+ mph gusts) and areas of blowing/drifting snow (Glacial Lakes region) until sunset.