Aikyam-Lab/Synoptic-Bench huggingface dataset:
410 AM CST Fri Dec 29 2017 Freezing drizzle is expected to develop later today into tonight, impacting much of the forecast area. Temperatures north of the MO River will solidly be below the freezing mark at the surface, with widespread teens and 20s expected. South of the river, warmer temps look to reside here with highs hovering right around the freezing mark. Despite the widespread sub-freezing temps expected today, the cause for the freezing drizzle is due to the combination of a low-level saturated layer that will reside outside of the favorable dendritic growth zone, inhibiting ice crystal formation for precip to fall as snow rather than the freezing drizzle expected.
Warmer temperatures mainly south of Interstate 90 will limit snow accumulation over those southwest valleys. Meanwhile, low pressure will move east roughly along the US-Canada border toward the Northern Rockies by this afternoon. This will result in the Arctic boundary moving north and east onto the plains as a warm front. As this low forms, a southeasterly low-level jet will develop along the mountain-plains interface. This low-level jet axis will then serve as the impetus for rapidly increasing snowfall rates in a narrow corridor over the plains.
954 AM EST Fri Dec 29 2017 Arctic high pressure will build toward the region today through Saturday.
610 AM EST Fri Dec 29 2017 Low pressure off the Southeast Coast will move farther offshore today. Canadian high pressure in the forecast area will be reinforced behind a dry cold front Saturday night. Shallow moisture has spread inland associated with low pressure off the Southeast Coast. Dry high pressure will ridge into the area from the north with low pressure farther off the Southeast Coast. We leaned toward the lower temperature guidance because of the cold air mass. The models show little moisture associated with a reinforcing cold front approaching Saturday and moving into the area Saturday night.
304 AM CDT Wed Mar 21 2018 Rather tranquil weather with a warming trend the next couple of days as an upper ridge builds over the Rockies and across the high Plains with increasing southerly low level flow for central/eastern Kansas. The going forecast/temperatures are on track, trending from the low to mid 60s today into the lower 70s on Thursday.
As the low tracks further away, skies will gradually clear from north to south across the area this morning. High pressure will begin to shift east of the region on Thursday, allowing a weak impulse to approach from the northwest.
313 AM MDT Wed Mar 21 2018 Latest upper analysis depicts an upper ridge building over the western CONUS. At the surface, light southwesterly winds will become southeasterly this afternoon as a high pressure center strengthens over the central plains. With the ridge building to the west, dry and warmer weather is expected today with highs mainly in the mid 40s to mid 50s. Cooler temperatures will occur over northwestern South Dakota where the coverage of the snow pack is most extensive. On Thursday synoptic scale subsidence associated with the upper ridge building over the forecast area will lead to dry weather and warmer temperatures. As the upper ridge shifts eastward on Thursday night as series of disturbances in the southwesterly flow aloft will bring a good chance of precipitation to much of the area.
305 AM EDT Wed Mar 21 2018 Snow should begin to taper off later today as low pressure exits. Dry weather is then expected under high pressure through the rest of the work week. Snow is expected to continue through part of the day as low pressure crosses the OH Valley and Mid Atlantic regions.
451 AM EDT Wed Mar 21 2018 A cold front is moving slowly through the Florida Keys and adjacent coastal waters early this morning. An expansive, but weak, high pressure cell extends from the Canadian Prairies to the Gulf of Mexico. For tonight, clear, breezy, and cool conditions are expected, with low temperatures ranging from the mid 50s near Ocean Reef to the lower 60s around Key West. Another cooler-than average and breezy day is expected Thursday, before a slow moderation proceeds from Thursday night into the weekend.
Speaking of those modifying thermal profiles, they should support afternoon temperatures a smidge warmer than those observed yesterday, with readings largely ranging through the 30s across both peninsulas. Perhaps some cloudiness from a decaying upper low dropping south out of Canada Thursday into Thursday night. The strong ridge of high pressure will take its time moving by to our north this weekend.
/issued 917 PM CDT Tue Mar 20 2018/ Surface and upper-ridge to influence weather conditions overnight with temperatures forecast to fall into the upper 30s to lower 40s across the region.
/Issued 937 PM EDT Tue Mar 20 2018/ Low pressure is currently emerging from the coast of South Carolina. High pressure will continue to build in from the west. The gradient will be tight between the building high and departing low pressure, so winds are expected to stay up overnight with a good bit of mixing. Tweaked the pops a little bit, as isolated showers continue as the long wave trough continues to move through. /Issued 323 PM EDT Tue Mar 20 2018/ The upper level low over the Carolina's will begin to lift northeastward as the surface front continues to push away from the forecast area. Forecast soundings support a mixture of rain and snow with all snow across the higher elevations.
Ky Transportation sensors through much of the advisory area indicate pavement temps still several degrees above freezing, but bridges and overpasses may develop slick spots/pockets of black ice as temps hover right around the freezing mark around sunrise. Unseasonably chilly high pressure system will build east into the MS River Valley behind the next of what has been a chain of Noreasters out over the East Coast. It will be a cold night with freezing temps most locations by Thu morning, so those with tender flowering vegetation may take measures to try and protect from the cold.
1137 PM MDT Tue Mar 20 2018 06Z TAF CYCLE Dirty upper ridge over NM next 24 hrs. Weak surface lee trough developing aft 21Z.
458 AM EDT Wed Mar 21 2018 WV imagery and RAP analysis indicated a weak mid/upper level nrn stream trough from Manitoba into the Upper MS valley and a downstream ridge through nw Ontario. At the surface, high pressure centered near James Bay dominated the region with dry ene low level flow. This will allow temps to drop toward the lower end of guidance with min readings in the low single digits west to the lower/mid teens along the Great Lakes. Quiet weather is expected to continue into the weekend under persistent high pressure. Building 5h heights and confluent flow ahead of an advancing mid- upper ridge from the west will yield more sunshine Thu and Fri as temps push back toward normal with highs in the lower to mid 30s north to lower 40s south.
302 AM EDT Wed Mar 21 2018 Strong upper trough will bring cooler and breezy conditions today behind a cold front.
250 AM MST Wed Mar 21 2018 High pressure aloft will continue to bring warmer temperatures with readings peaking Thursday in the mid 80s to around 90 degrees.
Snow will remain above pass levels through most of tonight, then will lower with significant accumulations possible at the higher elevations.
A good frost is expected over eastern portions as minimums fall into the low to mid 30s.
504 AM EDT Wed Mar 21 2018 Snow should begin to taper off later today as low pressure exits. Dry weather is then expected under high pressure through the rest of the work week. Snow is expected to continue through part of the day as low pressure crosses the OH Valley and Mid Atlantic regions.
500 mb and surface ridging will maintain a dry and stable environment throughout the upcoming 24 hours. Clear skies and light winds tonight will allow temperatures to fall into the 50s across most of the CWA with temperatures in the lower 60s along the lower TX coast. The surface pressure ridge will shift eastward Wednesday allowing winds to veer more to the east and increase as the pressure gradient increases across the area. Temperatures will be in the lower 80s across the lower RGV to the middle 80s across the middle to upper RGV Wed afternoon. Temperatures will be warmer Wed night with lows in the upper 50s north to lower to mid 60s south.
350 AM CDT Wed Mar 21 2018 In between systems today as upper closed low spinning on satellite over the Ohio Valley and closed low off Vancouver, with upper ridge between the two. Numerous waves moving down the backside of the low to the east along the eastern borders of the Dakotas. Mostly clear skies today and light west to southwest flow pushing a warm front across the area. Ridge will continue to build east and north tonight with warmer air aloft.
402 AM MDT Wed Mar 21 2018 Synoptic Setup: Short term begins with a ridge over the western half of the CONUS which crests over central British Columbia and Alberta. A trough of modified Pacific air splits off from this airmass and flows into the Gulf of Alaska and bottoms out offshore of Oregon. Today through Thursday: As the ridge moves in from the west daytime mixing will lift some of the moisture and dissipate it into the free atmosphere, eliminating some cloud coverage and morning fog by the afternoon. The ridge itself should transition by rather fast with a beautiful day Thursday as well. Meanwhile, the trough off shore will move inland over the Pacific Northwest.
/Issued 402 PM CDT Tue Mar 20 2018/ A dry northwesterly upper flow will prevail Wednesday with an upper ridge developing over the Panhandles Thursday.
400 AM CDT Wed Mar 21 2018 Upper level ridge builds over the Rockies today and tonight. Light precip was occuring in the low level instability.
Showers are expanding in coverage to the south and west of the CWA this morning, associated with a warm front that will move northeast through the area today. These showers will enter the area this morning, and additional showers will develop behind the warm front this afternoon and evening. Therefore, significant snows will be confined to the highest peaks. On Thursday, a cold front will move toward the region from the west, and convection will once again develop in the warm sector.
217 AM CDT Wed Mar 21 2018 As mid-level ridging slowly advances eastward through Thur temperatures will trend up. Initially the warmest temperatures will be across the west including SE NM where the low-level thermal ridge will be most amplified.
An upper level low was evident in latest WV imagery over E KY and should slowly move east overnight. So, have adjusted PoPs to reflect this and only have a rain/snow mix in the higher terrain of NE AL and S Mid TN. Another thing that might help to keep temps above freezing tonight is some mid-level cloud cover that will cross the area tonight. Generally sunny skies, but colder than normal conditions are forecast for Wednesday, or the first full day of Spring, as cold high pressure builds in from the west. Somewhat colder conditions are expected Wed night as winds become light/variable under the high as it moves across the region. Night time lows for most if not all of the area should fall below freezing.
Should see a clearing sky on Wednesday as high pressure continues building into the Mississippi Valley from the west. There's still some question though about how much moisture will be available to generate precip as the retreating ridge axis extends all the way south into the central Gulf of Mexico.
533 AM EDT Wed Mar 21 2018 Strengthening low pressure east of the Delmarva Peninsula will track northeast and away from Pennsylvania tonight. A ridge of high pressure will build into the region from the Great Lakes late in the week. Low pressure moving out of the Mississippi Valley will likely pass well south of Pennsylvania over the weekend. Mid level closed low over the Ohio Valley will shift eastward across Virginia today, placing southern Pa in favored region of best deformation/frontogenetic forcing and anomalous easterly flow. Expect a similar situation to play out today, with the high March sun angles helping to melt snow on pavement. NBM/Superblend indicating max temps Thursday ranging from the low 30s over the highest terrain of the Alleghenies, to the low 40s in the Susq Valley.
/issued 239 PM CDT Tue Mar 20 2018/ Temperatures will moderate to above normal levels Wednesday, then well above Thursday as a flat upper ridge spreads over the region.
641 AM EDT Wed Mar 21 2018 Strong upper trough will bring cooler and breezy conditions today behind a cold front.
Building ridge in advance of deepening low off the Pacific coast will bring a warming trend through Thursday. Impressive WAA at 700 MB by Thursday w/ 700mb temps above freezing and 850mb temps greater than +10C. Nights will fall below freezing in the eastern valleys with the possible exception of Thursday night w/ thermal low and cloud cover in place.
/issued 805 PM EDT Tue Mar 20 2018/ After one of the more active weather days we've seen in quite some time across west-central and SW Florida, skies are quickly clearing across the area as a cold front is pushing through the region. Behind the front, much cooler and drier air will infiltrate the region with a fairly cool day expected for your Wednesday. Winds and seas will continue to increase this evening as the cold front pushes through the waters and high pressure starts to build into the area.
high pressure is swinging in behind the front and settling into the central United States and the northwest gulf region.
/issued 314 AM CDT Wed Mar 21 2018/ Southerly winds will return to the area today along with warmer temperatures.
329 AM CDT Wed Mar 21 2018 (Today and Tonight) High pressure across the region will leave quiet weather in place for today and tonight. Temperatures will be a bit warmer than yesterday in the mid to upper 70s with sunny skies. Then for tonight, low temperatures should drop into the lower 50s.
Tonight Through Thursday Plenty of clouds across Arkansas this afternoon, but these should mostly dissipate overnight as high pressure builds over the region from the northwest. High pressure will be over the area on Wednesday, with more sunshine in the forecast. The high will begin exiting to the east on Thursday, with northwest winds becoming more southerly.
524 AM EDT Wed Mar 21 2018 Strengthening low pressure east of the Delmarva Peninsula will track northeast and away from Pennsylvania tonight. A ridge of high pressure will build into the region from the Great Lakes late in the week. Low pressure moving out of the Mississippi Valley will likely pass well south of Pennsylvania over the weekend. Mid level closed low over the Ohio Valley will shift eastward across Virginia today, placing southern Pa in favored region of best deformation/frontogenetic forcing and anomalous easterly flow. Expect a similar situation to play out today, with the high March sun angles helping to melt snow on pavement. NBM/Superblend indicating max temps Thursday ranging from the low 30s over the highest terrain of the Alleghenies, to the low 40s in the Susq Valley.
Low pressure system is spinning around just north of our area and bringing in wrap around moisture. The higher elevations are still expected to remain at or below freezing and could see significant accumulations with this northwest flow event. We should see widespread temperatures at or below freezing once again tonight, but most of the precipitation should be out of the area, so am currently not expecting much if any additional snowfall tonight in the Valley once temperatures begin to drop again.
506 AM EDT Wed Mar 21 2018 The main low pressure system is progressing eastward, but looks to redevelop past the Appalachians. The highest snowfall amounts are still forecasted to occur in higher elevations above 2000 feet, but mainly in the southeastern terrain. Tonight's lows will be cooler than last with the passage of this latest system. IFR/LIFR ceilings with light precipitation, mainly in the form of snow, will continue across the area through 12z, as low pressure continues to rotate near the region.
Expect this to continue this morning until the upper level ridge begins to amplify along the Rockies later today and subsidence increases. This will result in warmer temperatures with highs in the 50's to low 60's as winds shift into the west or southwest. Model soundings are favorable for some fog development late tonight as warm air aloft moves across the area and skies clear, so added some fog in the lower valleys from just east of Lusk towards Chadron and Alliance Nebraska. Some fog is possible across the lower North Platte River valley as well. Some cooler air will move into the western zones, so expect some accumulating snow above 9000feet in the mountains. In the lower elevations, it will be relatively mild at night with lows in the upper 30's to upper 40's mainly because of increasing cloudiness.
Cutoff low pressure over the OH Valley expected to get nudged eastward today to the east coast. Daytime temps should be a couple degrees warmer than yesterday.
Tomorrow should be warmer than today. Thursday looks to be even nicer than Wednesday as upper level ridging builds into the Central Plains.
/issued 217 AM CDT Wed Mar 21 2018/ As mid-level ridging slowly advances eastward through Thur temperatures will trend up. Initially the warmest temperatures will be across the west including SE NM where the low-level thermal ridge will be most amplified.
1238 AM CDT Wed Mar 21 2018 Weak short wave trough currently moving through the region will shift to the south and east tonight, bringing any light snow to an end across the southern portion of the area.
314 AM CDT Wed Mar 21 2018 Southerly winds will return to the area today along with warmer temperatures.
Given the dry low-level air feeding into the area from the high pres to the n, expect this -sn to dissipate before reaching the fcst area. Quiet weather is expected to continue into the weekend under persistent high pressure. Building 5h heights and confluent flow ahead of an advancing mid- upper ridge from the west will yield more sunshine Thu and Fri as temps push back toward normal with highs in the lower to mid 30s north to lower 40s south.
442 AM MDT Wed Mar 21 2018 Water vapor and IR imagery show a flat upper level ridge building over the Central Rockies. With the ridging aloft and weak surface gradient, winds will be lighter today. Medium range forecast models show a gradual progression from upper ridging over Colorado to southwesterly flow aloft and then an upper low over the southwestern U.
Temperatures will trend closer to normal values for the second half of the week heading into the weekend as the coastal low helps to displace the high pressure that has been entrenched across the region over the past several days.
A strong mid level trough will continue to swing through the southeastern US and Mid Atlantic region today and tonight, propelling the surface cold front through southern Florida and into Cuba. Highs on Thursday will be even cooler than today despite the sunny skies, generally topping out from the mid 60s to around 70.
117 AM EDT Wed Mar 21 2018 An upper trough will remain positioned over the Southern Appalachian Region throughout the TAF period. Temperatures at the surface will stay above freezing and expect little to no accumulations. The low clouds and even some reduced VIS due to fog and/or snow will generate occasional MVFR to IFR conditions tonight and to a lesser extended into Wednesday. with the upper trough rotating through the area.
Temperatures will warm Wednesday into Thursday as the pattern amplifies, with an upper ridge building into the Plains.
with the highest rain chances remaining across the southern half of the forecast area. Broad surface ridging will build across the region in the wake of the exiting system. with warmer afternoon temps (although still remaining below average).
851 AM EST Wed Nov 8 2017 High pressure will build into the region through Thursday. A strong cold front will drop south across New England Thursday night.
A surface cold front currently draped across southern Manitoba and Saskatchewan will sag into and across North Dakota and northern Minnesota through the late forenoon and afternoon hours producing cloudy skies and widespread light snow. From one to two inches of snow is expected today mainly along and north of the Highway 200 corridor, with Trace to one inch snowfall amounts south of the Highway 200 corridor.
Narrow ridge pinched between these lows over BC keeping northeast Montana under the northerly flow around the Hudson Bay low, but with moisture streaming off the Pacific. This will keep cold air in place for Thursday even as the Hudson Bay low loses it's dominance and ridge moves across the divide.
Small craft advisory looks in good shape for later tonight into Thursday night as potent cold air advection regime sets up in the wake of departed cold front. Southwest winds increasing today and into Wednesday evening ahead of an approaching cold front. Clouds will increase tonight ahead and near the cold front, possibly becoming MVFR along with light snow north of Madison and Milwaukee.
A cold front is still on track to drop south into the northern CWA later this afternoon.
415 AM MST Wed Nov 8 2017 Current surface map shows trof across central Montana/eastern Wyoming. Upper level ridge building across the northern Rockies, with abundant high clouds spreading across the northern plains. For today, weak westerly low level flow will bring warmer temperatures today, though clouds will limit warming across the northern half of forecast area. Cold front backs into the area tonight as 1035mb high slips southward out of Canada. The high shifts into the eastern Dakotas Thursday.
702 AM EST Wed Nov 8 2017 An extensive ridge of high pressure extending from the Mid mississippi Valley to the Mid Atlantic Region and New England States will provide fair and chilly weather today and Thursday.
Weak NE flow in the low levels may allow for a few showers to push onshore through early afternoon, mainly across Indian River and St. Otherwise it will be dry today with skies ranging from mostly to partly sunny, and highs again in the low to mid 80s.
A weak cold front will bring a slight chance of precipitation mainly north of Fresno County late tonight and Thursday. Cirrus clouds that gradually increase across the CWA today are forerunners of a cold front that currently trails southward from a storm system centered off the Pacific Northwest coast. While the cold front looks fairly impressive on current satellite imagery off the West coast, folks shouldn't be getting too excited about it if they think it will bring significantly wet weather into the central California interior. Its arrival, much like the past two cold fronts, will be accompanied by little if any measurable precipitation late tonight and Thursday.
632 AM EST Wed Nov 8 2017 High pressure will extend across the region into Thursday. A cold front will sweep across the area Thursday night. Canadian high pressure will build in for the end of the week. Ridge of high pressure will extend across the area until Thursday afternoon when it gets shunted off to the southeast as a cold front approaches from the northwest. A cold front will move through Thursday night. Although there will be no precipitation with this system, there will be a noticeable change in temperatures with much cooler air working into the region.
Upper trough swinging southeastward through Colorado early this morning, with back edge of snowfall dropping south of the Arkansas River as of 1030z. Fairly substantial warming aloft then develops this afternoon and overnight as flat upper ridge builds over the srn Rockies, leading to max temps well above freezing across most of the region by late day.
418 AM CST Wed Nov 8 2017 Today and tonight: The slow moving cold front that passed south through most of the region yesterday and through the evening is now just starting to clear through the Pine Belt and will be heading toward the coast through the day.