Aikyam-Lab/Synoptic-Bench huggingface dataset:
A fast moving upper-level short wave & surface cold front will sweep across the central & northern Rockies today, yielding increasing rain and snow chances and forcing temperatures downward by early afternoon. This should be the best chance with 750 mb flow around 50-55 knots, but with our low confidence & limited duration, we opted to cancel the High Wind Watch and cover with an SPS as warranted later this morning. Winter Storm Warnings look excellent over the Snowy and Sierra Madre ranges w/ around a foot of snow expected in the high country. Good low-lvl frontogenesis, coupled with strong negative EPVs in the lowest 0-2 km as well as appreciable elevated CAPEs near 150 J/kg could prove supportive of mesoscale banding of heavy snowfall over our western zones.
Upper ridging will continue over the Southern Plains today with W to SW surface flow and downsloping winds aiding in day time heating. The upper ridge will break down as a trough from W Conus will move over the plains by Thursday. The aforementioned trough will then trek over the Midwest allowing a cold front to drop out of the north into the area Thu night changing sfc flow out of the N to NE.
Also, the low level layer of moisture is too shallow for long lasting fog in much of southwest and north central Nebraska this morning. There should be sufficient lift along the leading edge of a fast moving cold front entering the Great Plains from the northwest to kick off precipitation development. Other potential hazards include blowing snow due to peak wind gusts of 30 to 35 knots associated with the frontal passage, as well as flash freezing as any liquid on surfaces will freeze as temperatures decrease through the night. In the wake of the cold front, temperatures will become seasonal once again.
WV imagery indicates a weakening upper level ridge of high pressure transitioning eastward across the Central Plains. Near the surface, a lee side trough of low pressure is slowly strengthening in eastern Colorado. Winds will generally be from the south through this evening then shift to the north behind a cold front closer to sunrise tomorrow. A slight chance of light snow may be found just behind this cold front but accumulations will be light if nonexistent.
640 AM EST Wed Feb 3 2021 A strong upper level low over the Mid Atlantic coast will drift slowly northeast over New England today. Meanwhile, high pressure will settle over the Southeast states through Thursday.
(Today and tonight) Upper ridging will hang on for one more day over the area before a pattern change leads to much cooler conditions. This will keep lows well above average tonight before a cold front begins to cross the area Thursday morning.
549 AM CST Wed Feb 3 2021 (Today and tonight) Upper ridging will hang on for one more day over the area before a pattern change leads to much cooler conditions. This will keep lows well above average tonight before a cold front begins to cross the area Thursday morning.
Low pressure will move across the region Thursday bringing breezy conditions and rain to the area. High pressure is centered over central Illinois this morning and will slowly drift east through the day. In general expect highs in the mid 30s north to upper 30s lower 40s south, but for any areas that potentially stay under stratus through the day, temps may only top out in the lower to mid 30s. Non-diurnal temp trends are expected tonight as the high slides to our east and southerly flow increases.
The flow then shifts southerly this evening as low pressure deepens over the Great Plains. Temperatures will be near normal with highs today in the low 30s, and overnight lows in the upper teens to low 20s. A low pressure system will move into the area on Thursday. But then as the negatively tilted trough axis and accompanying cold front swing through Thursday night, much colder air will arrive quickly, while it may remain a few degrees above freezing just above the surface layer. This may result in some areas seeing a brief period of freezing rain before morning. Flash freezing of wet roadways is also a concern. Strong winds will also accompany this front, with gusts in excess of 30 mph, which could cause freezing spray along the Lake Michigan shoreline.
(Today and tonight) It will be warm today with highs in the mid 70s to 80 degrees, as a lee trough to the west continues to bring southerly winds to the region. The stronger winds and increasing moisture will keep lows on the warmer side, in the low to mid 50s.
These breezy winds will continue through the overnight hours tonight ahead of and behind a passing cold front. Looking at the bigger picture, the low level thermal ridge placement is more over eastern New Mexico with a 30 to 40 knot 700mb jet.
437 AM PST Wed Feb 3 2021 A low pressure system moving southeastward through the Great Basin today will bring cooling, a return of the marine layer with morning coastal low clouds and locally dense fog, and gusty west winds for the mountains and deserts this afternoon and evening.
A weak weather disturbance approaching from the northwest will also bring breezy conditions by this afternoon before bringing a dry cold front through the region early on Thursday.
Today: A vigorous mid-level trough moving onto the Pacific NW coast early this morning will progress into the northern inter-mountain region today while an associated surface cold front advances from the northern Rockies into the northern Plains. Increasing south winds ahead of the front will allow a warmer low-level air mass to overspread the mid MO Valley today.
However, the upper level ridge is expected to continue to hold in place through tonight before beginning to erode as a trough approaches the area.
314 AM MST Wed Feb 3 2021 A cold front will push through NE Montana today, bringing with it light accumulations of wet snow as well as the potential for freezing rain to mix in at times. A cold front will push through with light snow and potential for some mixing in of freezing rain.
742 AM EST Wed Feb 3 2021 Snow in the ridges should end this morning as high pressure builds in, otherwise dry weather is expected today.
temperatures are near freezing around AMA to the mid 50s at BRO. Looking at a quiet weather pattern as the ridge aloft and the exiting elongated high pressure over the central will give us a another sunny day.
420 AM EST Wed Feb 3 2021 At the upper levels, the CWA is situated between the exiting trough over the Eastern Seaboard and New England, and an upper-level ridge building in from the west. At the surface, high pressure and subsidence will shift over the CWA through the day. High temperatures will range from the lower 40s to mid-50s. An associated cold front and line of rain showers will push across the Deep South on Thursday, though the CWA should stay dry with just mid- and upper-level clouds increasing ahead of the cold front and associated showers.
This system exits stage right by early evening, and with an upper ridge nudging in quickly behind, precipitation does not linger into late evening. The upper ridge continue to build in from the west overnight, with a thermal trough developing by Thursday morning along the southern coast. This will bring morning valley fog and areas of valley freezing fog Thursday morning to mostly west of the Cascades.
Sfc and upper ridging over the Mississippi Valley will slowly build east and allow clearing to win out through the day. Otherwise it is a transitional day as the ridge axis drifts across by midnight tonight, after which we start to see modest return flow set up.
316 AM PST Wed Feb 3 2021 A cold front passing through the district will bring gusty conditions over the higher terrain of the Sierra Nevada and the wind prone areas of Kern County today. Latest GOES-17 reveals a cold front passing through the region this morning, but it's lacking moisture. However this system will still be capable of bringing gusty winds over parts of the high country as well as wind prone areas of Kern County today. After the system pushes through, a dry weather pattern is being forecast by blended model guidance as high pressure builds over the Eastern Pacific.
A strong and fast moving cold front will continue to move south across the area this morning. High pressure is then forecast to build over the Northeast Pacific and promote a period of dry weather through the weekend. A cold front NW of CEC will slide southeast across the area this morning, generating showers, gusty winds and low level wind shear. A cold front will quickly move across the waters this morning producing wind gusts to 30 kt.
Upslope snow to come to an end later in the morning as the moisture and thermal trough begins to erode over the central and northeastern mountains. Portions of southeast Ohio still may have trouble getting above freezing, as will the mountains. Another weak low level trough renews the patchy low level moisture tonight and an increase in clouds again just prior to ridging aloft finally pushing in after days under the influence of the closed low on the Atlantic Coast. High pressure will be present overhead at the start of the period, but will nudged northeastward throughout the day in advance of our next disturbance. Warm advection ahead of the onset of precipitation will bump temperatures up above freezing areawide.
As the day goes on, the upper low/trough that was responsible for the prolonged NW flow snow event across the forecast area the last 48 hours or so, will pull northeast away from the New England coast. Highs today should be in the low 40s for highs. Upper ridging moves in this afternoon through tonight. Forecast lows range from the low 20s in the north to upper 20s south.
528 AM EST Wed Feb 3 2021 Snow in the ridges should end this morning as high pressure builds in, otherwise dry weather is expected today.
Some patchy fog has even managed to develop in the near freezing temperatures across central Louisiana. Overnight lows tonight will be about 15 degrees warmer than this morning. An arctic originating upper trof will dig quickly through the central U.
346 AM CST Wed Feb 3 2021 An upper ridge currently sits comfortably overhead while a deep closed low continues to spin over the Northeast CONUS. The next trough of interest is entering the Pacific NW this morning. Lee troughing will tighten up the pressure gradient across the region today bringing increased southerly flow to the area. The pressure gradient along and behind the surface cold front will be quite tight, brining strong, at least advisory level, winds across the forecast area. Temp wise, MaxT was trended down for tomorrow, closer to the 50th percentile of Model Certainty which looks to align much better with the EC/NAM and other cooler model solution. The region will remain under northwest flow while several embedded waves make their way through the broad upper trough.
634 AM EST Wed Feb 3 2021 Cool, high pressure will advect into the region, bringing dry weather through Thursday.
Late Thursday afternoon through Thursday evening will see the passage of the next cold front and the possibility of some shower development. The surface cold front will continue to push through SE Texas on Thursday night, clearing the Houston metro area after sunset and reaching the coast around midnight. 25+ in) continue to be concentrated northeast of the I-610 loop, and thus have maintained the trend of keeping the highest PoP values confined to this area.
401 AM MST Wed Feb 3 2021 A Pacific Northwest storm system will bring a cold front across Utah and southwest Wyoming Wednesday through early Thursday, resulting in potentially significant snow for the mountains of northern and central Utah.
524 AM CST Wed Feb 3 2021 An upper ridge currently sits comfortably overhead while a deep closed low continues to spin over the Northeast CONUS. The next trough of interest is entering the Pacific NW this morning. Lee troughing will tighten up the pressure gradient across the region today bringing increased southerly flow to the area. The pressure gradient along and behind the surface cold front will be quite tight, brining strong, at least advisory level, winds across the forecast area. Temp wise, MaxT was trended down for tomorrow, closer to the 50th percentile of Model Certainty which looks to align much better with the EC/NAM and other cooler model solution. The region will remain under northwest flow while several embedded waves make their way through the broad upper trough.
Upper ridge axis overhead, southerly surface winds, and little cloud should result in a much warmer day today with temps locations potentially reaching 60. Cold front passage late tonight in Thursday morning keeps many locations mild through the night with temps falling into the upper 20s to mid 30s during the day on gusty northwest winds. Will need to watch specific temp levels and precip amounts as a cooler/wetter solution could lead to slick roadways from a flash freeze.
935 AM EST Wed Feb 3 2021 A strong upper level low over the Mid Atlantic coast will drift slowly northeast over New England today. Meanwhile, high pressure will settle over the Southeast states through Thursday.
High pressure is currently centered over northern Illinois. As the high moves slowly southeast today, dry weather will continue. Temperatures will be a little warmer today with highs from the mid 40s to lower 50s. Lows Thursday morning with be from the lower 30s to around 40 degrees. Temperatures will be warmer on Thursday with highs from the mid 50s to lower 60s.
408 AM CST Wed Feb 3 2021 Another day, another round of fog and freezing fog. Expect the cold front to move into central SD around 18Z and our eastern counties 00-003Z Thursday.
A passing weather system will bring slightly cooler weather with breezy conditions to the area by Thursday.
Brief break in precip across the region early this morning as radar indicates only a few flurries remaining across the higher elevations while satellite imagery indicates most of the Central Valley has cleared out. Current temperatures are considerably cooler, 10-15 degrees, across most of the area compared to 24 hours ago.
High pressure will build overhead from the west through the day, and will be overhead during the night Tonight. With subsidence under the high, skies will be clear this period. With the high overhead Tonight, low level mixing will be limited allowing temperatures to drop to below freezing across much of the region. Given expected position of ridge, the flow along the coast should trend to onshore right before dawn, allowing coastal counties to not quite make it to freezing. Warming temperatures and increasing cloud cover will start off on Thursday as high pressure north of the region moves out to the east and prevailing flow shifts about to become more out of the southwest.
Another day, another round of fog and freezing fog. Expect the cold front to move into central SD around 18Z and our eastern counties 00-003Z Thursday.
The unseasonably warm temperatures will continue tonight as a southerly wind prevails through the night in advance of a cold front that is slated to plow through the region on Thursday.
330 PM EST Wed Feb 3 2021 Light snows will come to an end tonight with weak high pressure bringing partly sunny to mostly clear skies by Thursday afternoon into Thursday night.
151 PM MST Wed Feb 3 2021 A cold front is crossing the area from NW to SE at this hour. RA/SN will overspread most of the area by late aftn/early eve, becoming all SN tonight as cooler air continues to spill swd. Temps behind the first front will be much cooler than recently, but really just closer to normal for early February.
Cold front will enter NE OK a little after 12z Thu and into western AR by the end of the forecast. The unseasonably warm temperatures will continue tonight as a southerly wind prevails through the night in advance of a cold front that is slated to plow through the region on Thursday.
The cold front has made it to the Missouri River valley, and will continue to push quickly eastward across the state through the afternoon and early evening hours. But, expecting the headline for fog will need to be extended for several more hours prior to the cold frontal passage/wind shift forecast to occur later today. Other than revisiting the freezing "drizzle vs rain" p-type, no other notable changes planned to the forecast at this time. Another day, another round of fog and freezing fog. Expect the cold front to move into central SD around 18Z and our eastern counties 00-003Z Thursday.
Surface ridging will dominiate the forecasts for today. Surface ridging will keep winds generally light, except for TRI for this afternoon.
This ridge will move east across the FL Peninsula tonight. However, satellite imagery shows the shoreward edge of the cloud deck retreating off the southern FL Peninsula right now, so a turn to fully sunny skies is expected over the Lower Keys today.
Given the dynamics and cold air aloft with this feature, brief periods of moderate snowfall will accompany heavier showers as the trough axis crosses the region this afternoon. VFR except for areas of MVFR and local IFR with scattered snow showers as an upper level trough crosses the area.
Surface ridging will dominiate the forecasts for today. Winds will gradually take on a more NNE with time today, but expect nearly calm winds tonight as high pressure settles in. CD Chattanooga Airport, TN 47 28 52 38 49 / 0 0 0 90 20 Knoxville McGhee Tyson Airport, TN 43 25 48 36 44 / 0 0 0 90 30 Oak Ridge, TN 44 25 48 35 44 / 0 0 0 90 20 Tri Cities Airport, TN 40 21 48 35 43 / 0 0 0 90 50.
246 PM CST Wed Feb 3 2021 Upper level ridging has moved into the area today along with good low level warm advection. For tonight, the upper level trough will shift southeast into the plains with a strong low and surface cold front just west of the CWA by 12z. Cloud cover will be on the increase out ahead of this next system tonight and with the gusty winds will keep temperatures in the low to mid 40s over the western half of the area and the mid to upper 30s in the east. Thursday night and begin to dig a deep trough over the central U.
224 PM CST Wed Feb 3 2021 Upper level ridging with southwesterly surface flow is bringing warmer temperatures to West Texas and SE New Mexico. A trough currently over the West Coast will move across the Plains on Thursday, pulling down very cold air from Canada. A polar front associated with this trough will sweep down through the region on Thursday, but the coldest air will stay well to the NE of Texas. Temperatures Thursday afternoon will be cooler than Wednesday but still well above average, with highs in the 60s and 70s for most of the region.
Rain and snow shower chances return mainly to the Four Corners region Wednesday night as a cold front moves through. Dry weather and warmer afternoon temperatures are forecast for the weekend. This plume will move south through the day with the approach of the cold front coming down through the Great Basin this morning. Expect the cold front to pass through northern Arizona overnight bringing a dry airmass to the region Thursday.
This will allow a fast moving cold front to zip across the mid-state tomorrow night.
Focus then shifts to a system late Thursday afternoon into Thursday night that will bring a mix of rain and snow that will turn to all snow with as a cold front sweeps east Thursday evening.
An approaching cold front will cause an uptick in gradient wind & some gusty south winds upwards of 25-35mph near the end of the TAF period at GLH & GWO & possibly up to 25mph at JAN & HKS. With some continued subsidence warming in the low-levels & dry air aloft persisting, a nice warm & sunny afternoon is expected. Low-level ridge axis will build east, leading to some gradual WAA/return flow across the west into the afternoon.
Brief IFR ceilings are possible in heavier precipitation this morning, but confidence is not high enough to include the lower conditions in the TAFs. Skies will clear this evening with VFR conditions, but IFR/LIFR to develop later tonight in valley fog and freezing fog. A cold front has moved onshore and winds northwest winds will persist through this afternoon, becoming northerly this evening. High pressure will build offshore this evening along with a thermal trough near the coast, and this will produce gusty north winds and steep seas south of Port Orford through the weekend.
227 PM CST Wed Feb 3 2021 Key messages: - A cold front will move through the area tomorrow morning, dropping temperatures and bringing a brief period of wintry weather.
259 PM CST Wed Feb 3 2021 The southerly winds of 20 to 30 mph in the Red River valley of earlier today have started to diminish as the surface cold front approaches. Cold front/wind shift at 21z near Langdon-Devils Lake-Carrington line and moving east. Will still maintain some chc of freezing drizzle just ahead of the front as it moves east thru the evening, but chances are not high. If no freezing drizzle forms then advisory will need to be tied to some light snow/blowing snow in the northern RRV and NW MN overnight/Thu AM. The storm system to bring chances for wintry precipitation through Thursday moves out of the area, with a cold front pushing in cold air advection to the Northern Plains. High pressure builds in northern Saskatchewan bringing a NW flow aloft.
High pressure will shift overhead tonight and winds will become calm as the pressure gradient weakens across our area. With subsidence from overhead high pressure, calm winds, and skies remaining clear, cold overnight low temperatures and freeze and frost conditions are expected. Tomorrow, high pressure will shift to the east, and the prevailing flow will shift to be from the south. Temperatures will be warmer with highs in the low-to-mid 60s.
142 PM CST Wed Feb 3 2021 The upper ridge that has provided mild weather the past few days has begun to flatten this afternoon in response to an approaching upper level trough. Thanks to downsloping westerly surface winds warmer than normal conditions will continue for the rest of the afternoon with high temperatures climbing well above normal. Lee troughing has begun to combine with the increasing westerly flow aloft resulting in breezy winds across much of the area. These breezy conditions will continue overnight and into tomorrow morning thanks to a modest pressure gradient aloft as the upper trough swings through coupled with the passage of a cold front from the north.
221 PM CST Wed Feb 3 2021 Upper level ridging has moved into the area today along with good low level warm advection. For tonight, the upper level trough will shift southeast into the plains with a strong low and surface cold front just west of the CWA by 12z. Cloud cover will be on the increase out ahead of this next system tonight and with the gusty winds will keep temperatures in the low to mid 40s over the western half of the area and the mid to upper 30s in the east. Thursday night and begin to dig a deep trough over the central U.
1010 AM PST Wed Feb 3 2021 A low pressure system moving southeastward through the Great Basin today will bring cooling, coastal low clouds and locally dense fog, and gusty west winds for the mountains and deserts this afternoon and evening.
Upper level ridge axis extends from central Mexico, over the state, and into the Ohio Rivery Valley.
1125 AM CST Wed Feb 3 2021 (Today and tonight) It will be warm today with highs in the mid 70s to 80 degrees, as a lee trough to the west continues to bring southerly winds to the region. The stronger winds and increasing moisture will keep lows on the warmer side, in the low to mid 50s.
Dry weather is expected for mid- week as high pressure settles over the region today and Thursday.
Temperatures have been slightly overachieving, so temperatures are being bumped slightly warmer. Sfc and upper ridging over the Mississippi Valley will slowly build east and allow clearing to win out through the day. Otherwise it is a transitional day as the ridge axis drifts across by midnight tonight, after which we start to see modest return flow set up.