Aikyam-Lab/Synoptic-Bench huggingface dataset:
511 AM CST Sat Nov 30 2024 (Saturday through Sunday) Freezing temperatures thus far through 2 AM has covered nearly all of N LA and SW AR as well as most of NE TX except our far western counties and we should get there through those stubborn warmer areas by sunrise. SFC ridging which is directly overhead attm will shift east today, allowing for a return to southeasterly winds. Another chilly night tonight in advance of a weak cold front that will have moved through our northwest zones by sunrise Sunday Morning. 13 (Sunday Night through Saturday) The above mentioned airmass in the wake of the Sunday cold front will help to modify temperatures slightly but the much colder air associated with this change in airmass will get shunted mostly to our east to start the upcoming work week.
Most areas are expected to warm into the low/mid 60s this afternoon. A tad cooler than normal but nothing out of the ordinary. The presence of a little more cloud cover tonight, primarily across the southern half of the CWA, is expected to keep overnight lows a little warmer than last night. One of the dominant features in our weather over the next several days will be the presence of a developing coastal trough. Northern Piney Woods counties could find themselves falling to near freezing.
Highs tomorrow will be near seasonal normals, in the low to mid 60s.
236 AM MST Sat Nov 30 2024 - Freezing fog has developed over portions of northwest Kansas, prompting the issuance of a Dense Fog Advisory until 9 AM CT for the eastern half of the CWA. Caution is highly advised while traveling this morning as slick spots on bridges or other elevated surfaces may form.
(This afternoon through Sunday) 9am obs all above freezing with still 35 at Mount Pleasant and DeQueen and as warm as 43 at Texarkana. /24/ (Sunday Night through Saturday) The above mentioned airmass in the wake of the Sunday cold front will help to modify temperatures slightly but the much colder air associated with this change in airmass will get shunted mostly to our east to start the upcoming work week.
With temperatures going below freezing tonight, the timing of this system is perfect for creating slick road conditions on untreated roads later tonight into Sunday morning throughout it's path. This was done as this area won't see good upslope snow and temperatures will be rising above freezing, mitigating the impacts.
If the vertical profile of the atmosphere is sufficiently saturated, temperatures will be low enough (below freezing) to produce snow.
Again attempted to adjust overnight lows cooler as the first coupld of days are as much as 10 to 14 deg F off for basins and valleys in the NBM forecast. Wind continues light under the high pressure.
1212 PM CST Sat Nov 30 2024 (Tonight through Sunday) South Texas will reside on the southwestern periphery of weakening high pressure centered over the SE US today which will support generally light to moderate northeasterly flow as the surface.
The stratus has finally shifted south and west of the Lower Keys, leaving sunshine and temperatures mainly the mid 70s with dewpoints in the mid to upper 60s.
332 PM EST Sat Nov 30 2024 A series of dry cold fronts will move through the area over the next couple of days.
320 PM EST Sat Nov 30 2024 Low pressure will bring accumulating snow to southern locations tonight to Sunday morning.
(Rest of today through Sunday) The first cold front has cleared through the region ushering in cooler air in its wake. A trough remains over the Atlantic waters providing a focus for shower activity that has persisted through most of the day and could linger.
Deep troughing aloft is over the eastern CONUS early this morning, and will remain in place during the short term period. Meanwhile, at the surface, weak low pressure is over western KS. As the low and main precip shield depart, cold air advection will strengthen on upslope flow.
1136 AM CST Sat Nov 30 2024 - A weak cold front will move through the area this morning, with northerly winds following in its wake. - Highs near or slightly below normal with chilly overnight lows at or below freezing through the weekend. (Today and tonight) Water vapor imagery this morning show northwest flow aloft prevailing across the FA as upper level troughing resides across the eastern CONUS and upper level ridging sets up across the western CONUS. Overnight lows will be chilly once again below freezing, with light winds and clear skies leading to max radiational cooling across the region.
Temperatures will be cold again tomorrow morning with some isolated pockets of freezing temperatures in Levy County possible. As we start our work week an upper level trough will push south which will help to deepen the trough.
Additional snow amounts of a half inch to two inches are possible south of a Taylorville to Terre Haute line, with the higher end of that range more likely south of I-70.
Persistence the next several days under broad high pressure aloft. Ridge axis is currently off the northwest coast.
This will be due to some moisture being trapped in the lower levels thanks to an inversion aloft. Temperatures will increase tomorrow as warmer air will gradually begin to return to the area along with moisture riding te periphery of the ridge.
(Tonight) High pressure will drop further south tonight as a cold front enters KY, TN into AR.
252 PM EST Sat Nov 30 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. 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.
(Tonight through Sunday night) A low amplitude mid to upper level ridge lies to the west of Texas and the flow is from the northwest. High pressure at the surface is resulting in light and variable winds across our CWA. The upper ridge will flatten as it moves toward the east during this period. A cold front will move through Central Texas tonight and into our CWA Sunday where it will stall and dissipate.
Stagnant pattern persists for another day, with the latest upper air analysis highlighting the upper level ridge across the Western Seaboard having little movement in response to the closed low stalled out north of the Great Lakes over the last couple of days.
Temps already in the 50s for most of the region and could still see a few get into the lower 60s but overall nothing really to be worried about. /CAB/ (Today through Sunday) Very large upper trough over the CONUS will move to the eastern half of the nation and take up residence there.
1023 AM MST Sat Nov 30 2024 - Mostly sunny skies with cooler than normal temperatures expected this weekend. In any event, expect sun will again burn the low clouds off during the morning.
1124 AM CST Sat Nov 30 2024 The pattern across the CONUS this morning is characterized by broad cyclonic flow around an upper-level low pressure system centered over Ontario and Quebec. Still expect widespread temperatures near or below freezing, and widespread frost is expected in all zones Sunday morning. /NF/ NW flow will keep continental polar air locked over the region in the near term with broad longwave troughing over the east CONUS. Widespread freezing temperatures are anticipated again tonight with little to no change in airmass.
Locally, low-level southwesterly flow ahead of the approaching system has advected slightly warmer temperatures into the region. Temperatures have climbed into the upper-30s across the southwesterly portions of the area; whereas, temperatures remain in the low to mid-30s for areas along and north of the Hal Rogers Parkway. High pressure will shift off to the east as a quick moving clipper system approaches the area. HiRes CAM guidance continues to paint the I-64 corridor as the bullseye for the highest snowfall amounts. The low quickly exits early Sunday afternoon with lingering upslope snow showers occurring leading to light accumulations across the southeastern high terrain.
132 PM EST Sat Nov 30 2024 A series of dry cold fronts will move through the area over the next couple of days.
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.
The pattern across the CONUS this morning is characterized by broad cyclonic flow around an upper-level low pressure system centered over Ontario and Quebec. Still expect widespread temperatures near or below freezing, and widespread frost is expected in all zones Sunday morning. /NF/ NW flow will keep continental polar air locked over the region in the near term with broad longwave troughing over the east CONUS. Widespread freezing temperatures are anticipated again tonight with little to no change in airmass.
Weak warm air advection and some modest compressional warming will lead to afternoon highs some 4 to 8 degrees warmer than those observed yesterday. Overnight lows will range in the low 30s to mid 40s across North Texas, with Central Texas ranging in the upper 40s to mid 50s.
Clouds will continue to increase in coverage through the day and this will keep lows tonight a bit "warmer" than last night: mid 20s along the Plateau and 29-32 across the rest of the area. Regardless, still at or below freezing for almost everyone. (Sunday Night through next Saturday) Upper-level flow will remain out of the northwest, helping infuse a series of mostly dry cold front across the area through the week.
Dry cold front will move into parts northeast OK with an eventual shift to north winds. In the meantime south winds will gust in the 25-30 mph range in spots, with an overall decreasing trend as pressure gradient temporarily weakens ahead of the cold front. Temps are still expected to be several degrees warmer this afternoon.
- Snow shower coverage, however, will decrease as temperatures edge back up into the lower 30s.
(Through Tonight) The cold front is beginning to move into parts of northeast Oklahoma, with winds across Osage County shifting to a more northwesterly versus simply westerly direction currently. Overnight lows will be noticeably cooler across much of eastern Oklahoma, with expected low cloud development late tonight in far northeast Oklahoma and northwest Arkansas likely to keep temperatures warmer than they otherwise would be.
118 PM MST Sat Nov 30 2024 KEY MESSAGES: - Ridge of high pressure Sunday through at least mid week causing stable conditions.
1120 AM CST Sat Nov 30 2024 (Today through Sunday) Longwave troughing will persist across much of the eastern CONUS through tomorrow which coincides with a westerly flow aloft becoming northwesterly by Sunday night. Either way, high pressure stays in control in our region and a Polar air mass will dictate stable, cold weather through the weekend. Forecast highs today are generally in the 50s outside of some cooler terrain areas in our northeast counties which may only find the upper 40s.
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.
Moisture is limited so only expect light snow shower or flurries for the higher terrain. Snowfall of 1/2 to 1 inch possible across the highest elevations.
(This afternoon through Sunday) The pattern still very much dominated by a high pressure ridge aloft and a weak upper low situated off the southern West Coast. Much like the last couple of days, this upper low will gradually increase moisture and mid-to-high clouds over the region through the weekend.
1029 AM EST Sat Nov 30 2024 A broad and chilly cyclonic flow will remain over the region tonight and Saturday, bringing a few flurries or snow showers to the region, mainly over the higher terrain, through the rest of the weekend.
The overall synoptic pattern features a broad trough over eastern North America with a ridge over the West Coast of the same continent.
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.
Temperatures will generally be in the upper 50s to low 60s for Valley locations today, then a gradual warming trend begins on Sunday with widespread low 60s across the region, with upper 40s to mid 50s for the higher elevations.
/issued 137 AM PST Sat Nov 30 2024/ Rex block near 130W is continuing to maintain an upper level blocking pattern off the western CONUS coast which will keep our area dry this weekend. Some high level clouds area being pushed through our CWFA by the upper low at the bottom of the rex block near 30N/130W. The SREF is showing the rex block shifting east toward the coast today and inland on Sunday which will maintain dry weather across our area along with above normal temperatures from Sunday onward as the upper ridge strengthens and the upper low underneath it weakens.
1044 AM CST Sat Nov 30 2024 (Rest of Today) High pressure was centered over the ArkLaMiss region this morning and will shift east into TN and AL today. And with little or no wind as the high moves overhead, an overall pleasant weather day is ahead.
951 AM MST Sat Nov 30 2024 - Patchy freezing fog looks to linger through 12pm CT across eastern portions of the area before mainly sunny skies for the afternoon.
644 PM EST Sat Nov 30 2024 Low pressure passing south of the region will bring light snow to areas near and south of the Ohio River tonight into early Sunday morning.
918 PM EST Sat Nov 30 2024 Low pressure passing south of the region will bring light snow to areas near and south of the Ohio River tonight.
(Tonight) Low clouds moving over the area associated with a low pressure system to our NW will dictate just how cold we get tonight. Current forecast has morning lows in the high 20s to low 30s, however locations that see less cloud cover could certainly drop a few degrees cooler. Otherwise, light winds and dry conditions are forecast through the morning hours ahead of the passage of a dry reinforcing cold front tomorrow.
(This evening through Sunday Night) Light easterly/southeasterly winds and coastal trough near the Deep South Texas coastline are expected to bring a slight increase in moisture across the area tonight. CAMs suggest that isolated showers should remain confined to these areas throughout the duration of the weekend, with the highest rain chances further offshore closer to the coastal trough itself. Isolated spots near Crockett could see lows touch freezing, but most of the county should keep above the freezing mark. Another slog of dry air will filter into the area on Sunday as impulses to the north invigorate the upper level low over Ontario/Quebec.
514 PM CST Sat Nov 30 2024 (This evening through Sunday Night) Light easterly/southeasterly winds and coastal trough near the Deep South Texas coastline are expected to bring a slight increase in moisture across the area tonight. CAMs suggest that isolated showers should remain confined to these areas throughout the duration of the weekend, with the highest rain chances further offshore closer to the coastal trough itself. Isolated spots near Crockett could see lows touch freezing, but most of the county should keep above the freezing mark. Another slog of dry air will filter into the area on Sunday as impulses to the north invigorate the upper level low over Ontario/Quebec.
High pressure will continue to build into the area and persist through at least midweek, providing dry and stable conditions. Utah and southwest Wyoming remain under a west to northwest flow aloft this afternoon on the front side of a ridge centered over the Great Basin. Skies are clear over southern Utah with some scattered high clouds moving into northern Utah due to some moisture moving over the top of the ridge. The ridge will remain the dominant weather feature over the forecast area over the next several days. A low currently approaching the southern California coast will push the ridge axis eastward, moving it overhead for Sunday. With the California low expected to move little after that, the ridge axis will remain overhead through the midweek period.
Slightly warmer, but still single digit wind chills for inland locations Sunday night. Expecting to see winds gradually weaken overnight as high pressure over the Northern/Canadian Plains builds into the Dakotas and spread south and east across the Upper Midwest overnight. Clearer conditions and influence from incoming high pressure will continue for Sunday. With a bit more sunshine, southern WI will likely see daytime temps a few degrees warmer than today in the mid to upper 20s with wind chills in the teens.
Allowed the High Wind Warning to expire on time at 5PM. Stagnant pattern persists for another day, with the latest upper air analysis highlighting the upper level ridge across the Western Seaboard having little movement in response to the closed low stalled out north of the Great Lakes over the last couple of days.
703 PM EST Sat Nov 30 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. 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.
447 PM CST Sat Nov 30 2024 (Tonight) High pressure will drop further south tonight as a cold front enters KY, TN into AR.
WESTERN RIVERSIDE AND SOUTHWESTERN SAN BERNARDINO An area of low pressure south-southwest of San Diego continues to help generate upper-level moisture into the region today.
534 PM EST Sat Nov 30 2024 A series of dry cold fronts will move through the area over the next couple of days.
Pattern Synopsis: Longwave troughing will continue to churn over the eastern half of the CONUS through the end of the weekend. The vertically stacked system formerly over James Bay has finally decayed as the surface cyclone working up the Atlantic coast spins over eastern Quebec. A front will drop from north to south across the region late tonight and Sunday morning as the trough axis swings overhead. Pattern Synopsis and Forecast: Longwave troughing will continue to push eastward as high pressure tries to build across western CONUS.
Deep layer moisture continues to decrease over central PA translating to dewpoints in the lower to mid teens throughout. A clipper crosses the lower OH valley late tonight and Sun AM.
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. Temperatures will be cold again tomorrow morning with some isolated pockets of freezing temperatures in Levy County possible. As we start our work week an upper level trough will push south which will help to deepen the trough.
536 PM CST Sat Nov 30 2024 (Through Tonight) The cold front is beginning to move into parts of northeast Oklahoma, with winds across Osage County shifting to a more northwesterly versus simply westerly direction currently. Overnight lows will be noticeably cooler across much of eastern Oklahoma, with expected low cloud development late tonight in far northeast Oklahoma and northwest Arkansas likely to keep temperatures warmer than they otherwise would be.
Quiet weather continues through the weekend as high pressure builds into the Silver State to begin the month of December. Daytime highs rebound into the 40s from overnight lows that remain well below freezing. Saturday through Sunday night As the calendar changes to December, high pressure and ridging build into the SW CONUS Saturday and Sunday. A confluence of the zonal subtropical to the south and the ridged polar jet to the north resides to the east over the High Plains this weekend. 500-mb model guidance shows a gradual increase in 500-mb heights as the ridge over the west coast continues to strengthen into the next work week.
Still a chance to see minor accumulations in the higher elevations of northeast TN and southwest VA, but so far the returns on radar are not really producing much at the surface with the drier air in place. Moisture is limited so only expect light snow shower or flurries for the higher terrain. Snowfall of 1/2 to 1 inch possible across the highest elevations.
1132 PM CST Sat Nov 30 2024 (Tonight) Low clouds moving over the area associated with a low pressure system to our NW will dictate just how cold we get tonight. Current forecast has morning lows in the high 20s to low 30s, however locations that see less cloud cover could certainly drop a few degrees cooler. Otherwise, light winds and dry conditions are forecast through the morning hours ahead of the passage of a dry reinforcing cold front tomorrow.
336 AM EST Sun Dec 1 2024 High pressure and a drier airmass will build into the region today into tonight.
An area of low pressure south-southwest of San Diego continues to help generate upper-level moisture into the region today.
Short Term Update - High pressure over the southeast will continue to dominate Keys weather through the overnight, keeping winds gentle to moderate out of the north to northeast. While warmer waters around the Lower Keys will likely fight off much in the way of temperature falls, cooling shallows adjacent to the Middle and Upper Keys and shorter run from the mainland should help to push temperatures down into the mid to upper 60s.
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.
1116 PM CST Sat Nov 30 2024 (This evening through Sunday Night) Light easterly/southeasterly winds and coastal trough near the Deep South Texas coastline are expected to bring a slight increase in moisture across the area tonight. CAMs suggest that isolated showers should remain confined to these areas throughout the duration of the weekend, with the highest rain chances further offshore closer to the coastal trough itself. Isolated spots near Crockett could see lows touch freezing, but most of the county should keep above the freezing mark. Another slog of dry air will filter into the area on Sunday as impulses to the north invigorate the upper level low over Ontario/Quebec.
For now the Keys remain ahead of a reinforcing cold front that is steadily marching down the Florida Peninsula this morning. For now, we have been having bouts of stratocu as cooler air filters off the mainland and overruns on top of the relatively warmer, deeper waters, especially surrounding the Lower Keys. The aforementioned reinforcing front will sweep through the Florida Keys tonight, bringing not only cooler temperatures, drier dew points, but also freshening breezes.