Aikyam-Lab/Synoptic-Bench huggingface dataset:
/issued 307 PM CST Tue Jan 5 2021/ The trough over the eastern CONUS will gradually move east over the next 24-36 hours. Skies have cleared out nicely today with afternoon temperatures topping out in the low/mid 50s. The approaching trough, currently over the northern Rockies, will dig aggressively as it moves into the Plains and phases with a strong subtropical jet propagating across Mexico. Southeast winds of 25-30 kts on the eastern flank of the cyclone will advect Gulf moisture over the top of the cooler surface air mass.
217 PM MST Tue Jan 5 2021 High pressure builds into the region tonight through Wednesday for dry conditions with temperatures remaining above seasonal averages.
342 PM CST Tue Jan 5 2021 An upper level trough is currently progressing eastward across the Rockies and will be moving into the Plains this evening. A modestly strong 80-100 kt upper jet will dig southward through WY tonight, and as it rounds the base of the trough late tonight and Wednesday morning expect the upper trough to become closed at 500 mb.
209 PM MST Tue Jan 5 2021 A quick moving cold front brought areas of rain/snow and wind to the forecast area today. Otherwise dry and warm conditions can be expected for Wednesday as high pressure builds over the region.
Surface ridging will begin to slide in overhead this evening into the overnight hours. With the low level stratus clouds lingering in our east and the incoming upper level circus deck this evening, the overnight low temperatures were brought up slightly. However, widespread dense fog and dense freezing fog is not expected.
Moisture will increase and deepen on Wednesday as the Rockies trough digs southeastward acrs the southern plains, with showers increasing through the day.
With snow covered ground and limited snow melt today along with moisture trapped near the ground layer, high pressure and light winds over the area should allow an area of dense fog to grow this evening around the Bloomington, Peoria, and Lincoln areas and expand. Increasingly thick mid and high cloud cover Wednesday along with east to southeast surface winds picking up with the movement of low pressure into the southern Plains should erode the fog by late morning Wednesday.
The highest elevations of the Park, Gore, and Sawatch range may hold on to a few isolated snow showers until midnight before moist orographic flow tapers off. No changes have been made to the highlights currently in place and all will fall off no later than 5pm today when accumulating snow will come to an end. Weak ridging moves into eastern Utah and western Colorado on Wednesday.
645 PM EST Tue Jan 5 2021 High pressure will build from the Midwest tonight and Wednesday.
A cold front will then bring chances for scattered showers and possibly thunderstorms later Wednesday afternoon, as well as a westerly wind shift behind the front. /issued 253 PM CST Tue Jan 5 2021/ SHORT TERM (Tonight through Wednesday Night): The most significant event during this portion of the forecast will be the approach and Wednesday passage of a cold front.
Note that with temperatures below freezing, we have freezing fog and therefore slick spots are possible on untreated roads and surfaces. Surface ridging will begin to slide in overhead this evening into the overnight hours. With the low level stratus clouds lingering in our east and the incoming upper level circus deck this evening, the overnight low temperatures were brought up slightly. However, widespread dense fog and dense freezing fog is not expected.
516 PM CST Tue Jan 5 2021 (This evening through Wednesday) Unseasonably warm today followed by a cold front with rain chances (mainly eastern Oklahoma) tomorrow. A cold front will move into northwest Oklahoma before sunrise tomorrow morning, clearing most of the state by noon.
946 PM EST Tue Jan 5 2021 A weak upper level low will remain parked over New England through Wednesday supporting abundant cloud cover and occasional flurries and light snow showers with spotty minor accumulations.
550 PM CST Tue Jan 5 2021 Southerly winds early this evening will veer westerly ahead of a cold front that will move through the terminals late tonight (around and after midnight). This front will also drop temperatures back to seasonal normals, in the low to mid 50's.
650 PM EST Tue Jan 5 2021 Dreary January conditions will persist through the next several days with mostly cloudy skies and chances for flurries and freezing drizzle expected. Some chances for light snow/flurries are possible as spokes of moisture continue to pivot westward associated with the area of low pressure located within the Gulf of Maine. Soundings are tricky to discern whether there will be enough cloud ice to produce flurries, therefore have mention of both flurries and freezing drizzle possible through Wednesday night. With this in mind, the upper level pattern is quite chaotic with no less than 5 different troughs/ridges over the CONUS on any given day.
236 PM MST Tue Jan 5 2021 An upper level trof is moving across the state, bringing gusty west to northwest winds to much of the area, along with snow in the central mtns and a few showers over other mtn areas and even over mainly the northeast and east central CO plains. Tonight the upper trof is forecast to slowly move southeastward over the state, exiting the area Wed morning. The far southeast plains is expected to see gusty northerly winds through Wed, where there will still be a relatively strong gradient on the back side of the exiting upper trof. Wed afternoon an upper ridge will be pushing into western CO. Dry weather is expected on Wed and temps will be cooler.
434 PM MST Tue Jan 5 2021 At 21z a cold front was essentially bisecting the forecast area north to south and continuing to slowly move eastward. Temperatures will be back to near normal, with highs in the lower 40s and lows Wednesday night in the teens and 20s.
A mid level ridge had built in along with plenty of sunshine and light southerly winds. Cloud cover and increasing southerly winds will keep temps several degrees warmer than last night. High pressure over the Great Lakes and the low to our south will provide for a steady northeast surface wind, which will aid in temps falling into the lower 30s during the night.
With prevailing NW flow, prompting upsloping across the ridges, expect 1-2 inches of accumulation. The lower elevations stand to get another dusting. In the wake of the trough passing through, northwest flow will continue. As temps drop below freezing Wednesday night, some pockets of freezing drizzle will be possible again. Later in the night Wednesday night, as high pressure advances southeast across the lakes into the forecast area, winds will shift across to the northeast effectively cutting off moisture but still with cold air being advected into the area, the inversion will still hold strong across much of the forecast area. The colder air mass settling into place will bring some lows into the lower 20s and even some teens in the northeast leading to some below normal temps.
Upper trough over the area and associated low level instability will maintain stratocu overnight, along with light snow/snow showers and flurries across the Alleghenies.
729 PM EST Tue Jan 5 2021 A weak upper level low will remain parked over New England through Wednesday supporting abundant cloud cover and occasional flurries and light snow showers with spotty minor accumulations.
236 PM MST Tue Jan 5 2021 At 21z a cold front was essentially bisecting the forecast area north to south and continuing to slowly move eastward. Temperatures will be back to near normal, with highs in the lower 40s and lows Wednesday night in the teens and 20s.
607 PM EST Tue Jan 5 2021 Dreary January conditions will persist through the next several days with mostly cloudy skies and chances for flurries and freezing drizzle expected. Some chances for light snow/flurries are possible as spokes of moisture continue to pivot westward associated with the area of low pressure located within the Gulf of Maine. Soundings are tricky to discern whether there will be enough cloud ice to produce flurries, therefore have mention of both flurries and freezing drizzle possible through Wednesday night. In this in mind, the upper level pattern is quite chaotic with no less than 5 different troughs/ridges over the CONUS on any given day.
High pressure will build into the region moving forward through the mid week period.
653 PM EST Tue Jan 5 2021 A high pressure ridge builds from the west and north through Wednesday. This ridge then persists over northern Ohio and northwest Pennsylvania through this weekend. Looking at radar, snow showers have become more isolated over the last few hours and will continue to trend that way with the weakening trough. At the surface, a ridge builds slowly from the west and north through the period. These low clouds will tend to be warmer than -10C and thus too warm to support ice nucleation and snow production. Thus, the potential of drizzle or freezing drizzle through Wednesday night appears to be minimal.
Early afternoon GOES WV/IR imagery showed a potent upper trough axis along the WY/CO/NM Front Range. A Pacific cold front was analyzed from southwest SD through southeast WY. Lower elevations of Carbon and Albany counties can expect 1 to 3 inches, 2 to 5 inches over northern Carbon County and North laramie Range, and up to an inch across the high plains through this evening. 8 to 12mb surface pressure gradient across eastern WY combined with 60-80 meter CAG-CPR/CAG-BRX 850mb gradients and strong subsidence in the low/mid levels will contribute to periodic high winds. High temperatures Wednesday will be 5 to 10 degrees cooler compared to Tuesday. A potent upper level disturbance and cold front will move east across the districts this afternoon and early evening. Strong and gusty northwest winds will develop behind the cold front.
533 PM CST Tue Jan 5 2021 An upper level trough is currently progressing eastward across the Rockies and will be moving into the Plains this evening. A modestly strong 80-100 kt upper jet will dig southward through WY tonight, and as it rounds the base of the trough late tonight and Wednesday morning expect the upper trough to become closed at 500 mb.
547 PM CST Tue Jan 5 2021 319 PM CST We have high pressure moving in from the west and ample low-level moisture from the snow pack, continued low cloud ceilings, and restricted visibilities from freezing fog / fog throughout the forecast area. With continued low visibilities to the west, light winds, and high pressure ridging over our area, dense fog is expected to develop in the western CWA, and with light northwesterly winds, move slowly to the east, with 1/2 to 1/4 mile visibilities as far east as O'Hare possible into Wednesday morning. With strong high pressure to our north, the next weather system will be pushed south of our region towards the gulf coast states.
With some cooler air filtering into the area from the N/NE, temps should drop below freezing heading into the overnight hrs, with lows early Wed falling mainly into the upper 20s. This may allow for some patchy freezing fog to develop overnight, even with the high clouds moving into the area from the west. While any of this freezing fog may be locally dense and result in some slick spots on bridges/overpasses, the coverage thus far looks to be fairly sparse. High pressure will remain the dominant feature on Wednesday, keeping conditions dry throughout the day. Daytime highs will be a tad warmer, reaching the lower 50s. This is all ahead of our next system, a deepening upper level trough that will dig into the Lower MS Valley Wed night into Thurs before reaching the Central Gulf coast by Thurs night.
A cold front will shift the winds to the northwest around 05/06Z tonight and become gusty by sunrise at all terminals. /issued 201 PM CST Tue Jan 5 2021/ As a mid-level trof moves e-se of the Rocky Mtns this evening an assocd cold front will be pushed swd initially arriving in the far nwrn CWFA around 06Z/Wed and then the far swrn reaches before 15Z/Wed. GFS has trended back farther s and it now has an open wave similar to the 00Z/Tue and 12Z/Tue ECMWF depiction of a sharp positively tilted open mid-level trof.
720 PM EST Tue Jan 5 2021 High pressure will build from the Midwest tonight and Wednesday.
307 PM CST Tue Jan 5 2021 The trough over the eastern CONUS will gradually move east over the next 24-36 hours. Skies have cleared out nicely today with afternoon temperatures topping out in the low/mid 50s. The approaching trough, currently over the northern Rockies, will dig aggressively as it moves into the Plains and phases with a strong subtropical jet propagating across Mexico. Southeast winds of 25-30 kts on the eastern flank of the cyclone will advect Gulf moisture over the top of the cooler surface air mass.
634 PM EST Tue Jan 5 2021 West edge to low height anomaly/eastern noam trough is directly overhead of Lower Michigan this evening. Most of the moisture will fall below the DGZ, thus any precipitation observed could vary between snow/rain or some patchy freezing drizzle at times.
Scattered to numerous showers are expected as a cold front moves through the area Wednesday, then offshore by Wednesday night. Cooler and drier conditions and northwest flow will follow behind the cold front.
In the wake of a weak cold front that passed through the region this morning, we can expect breezy conditions to wind down to light winds by sunset. Although this cold front didn't bring anything in the form of precipitation, it did bring in a reinforced shot of cool air, which when coupled with clear skies tonight will lead to a chilly morning on Wednesday.
High pressure builds into the region tonight through Wednesday for dry conditions with temperatures remaining above seasonal averages.
At the surface, broad high pressure is sliding east of the local area with a baroclinic zone sharpening over along the front range pushing into extreme western Kansas and portions of western and central Nebraska.
A cold front will push through the late evening hours tonight with winds turning to the north. This afternoon through tomorrow Warm and windy will turn to cold and windy over the next 12 hours as a cold front sweeps through tonight. Highs tomorrow will be about 10 degrees cooler than today.
408 PM EST Tue Jan 5 2021 A weak upper level low will remain parked over New England through Wednesday supporting abundant cloud cover and occasional flurries and light snow showers with spotty minor accumulations.
This afternoon through tomorrow Warm and windy will turn to cold and windy over the next 12 hours as a cold front sweeps through tonight. Highs tomorrow will be about 10 degrees cooler than today.
A weak cold front is moving across the central peninsula this evening with a few clouds preceding it over the southern counties, and another cool night is in store with temps dipping into the upper 30s to lower 40s north of I-4 and the mid 40s to around 50 degrees to the south.
Upper trough over the area and associated low level instability will maintain stratocu overnight, along with light snow/snow showers and flurries across the Alleghenies. HREF mean shows the highest probs for a fresh dusting tonight over the Laurel Highlands, where orographic forcing is strongest. Mixing down ensemble mean 925mb temps of around -4C supports highs ranging from the low 30s over the northern mountains and Laurels Highlands, to the low 40s across the Lower Susq Valley.
211 PM MST Tue Jan 5 2021 Freezing Rain brought accidents this morning especially to the Glendive area where semis skidded off of Interstate 94. The Forecast period starts off with a semi-blocky flow with a progressive ridge moving overhead Wednesday.
Vertz A quick moving cold front brought areas of rain/snow and wind to the forecast area today. Otherwise dry and warm conditions can be expected for Wednesday as high pressure builds over the region.
956 PM EST Tue Jan 5 2021 A high pressure ridge builds from the west and north through Wednesday. This ridge then persists over northern Ohio and northwest Pennsylvania through this weekend. Temperatures across the area continue to hover near freezing. At the surface, a ridge builds slowly from the west and north through the period. These low clouds will tend to be warmer than -10C and thus too warm to support ice nucleation and snow production. Thus, the potential of drizzle or freezing drizzle through Wednesday night appears to be minimal.
Plenty of sunshine blanketing the southern Great Basin and Mojave Desert with temperatures running about 2-4 degrees warmer than this time yesterday. Only weather of consequence today is the north winds within the lower Colorado River.
548 PM CST Tue Jan 5 2021 A combination of fog and low vsbys are expected to create MVFR to IFR conditions for most site within a very warm and moist airmass ahead of an approaching cold front. Cold front moves through mid-day and should quickly result in VFR conditions as it passes through each site. Scattered to numerous showers are expected as a cold front moves through the area Wednesday, then offshore by Wednesday night. Cooler and drier conditions and northwest flow will follow behind the cold front.
May even see some warming overnight across our extreme west, especially once we see the lower cloud cover move into these areas after midnight. Speaking of the lower cloud cover, some high res progs are indicating we may see some very light precipitation moving into our far western zones near or just prior to 12Z so did add slight chance pops for these areas.
958 PM MST Tue Jan 5 2021 At 21z a cold front was essentially bisecting the forecast area north to south and continuing to slowly move eastward. Temperatures will be back to near normal, with highs in the lower 40s and lows Wednesday night in the teens and 20s.
1038 PM CST Tue Jan 5 2021 A cold front will sweep through the terminals early on in the TAF cycle, switching the winds to the north and increasing them to solidly breezy levels. This front will also drop temperatures back to seasonal normals, in the low to mid 50's.
Due to this, temperatures in the west will range from the mid to upper 30s while temperatures in the east will be in the lower 30s to near 30 degrees. The ridge will continue to shift east of the area on Wednesday and the surface flow will become more then southeasterly during the afternoon hours.
Only a few small areas north of I-94 and east of the MO River are likely experiencing a mix of sleet and freezing rain. Precipitation should slowly wane by the morning hours as the trough slides southeast. Western ND should warm up nicely again today under clear skies, while locations east of the MO River will likely struggle to rise above freezing.
Winds will begin to veer overnight as ridging noses in north of the region. Dry conditions are expected through the period as ridging keeps a southern stream low pressure system confined to the southeastern US.
A cold front currently moving through the area will shift the winds to the northwest around tonight and become gusty by sunrise at all terminals. A cold front will shift the winds to the northwest around 05/06Z tonight and become gusty by sunrise at all terminals. /issued 201 PM CST Tue Jan 5 2021/ As a mid-level trof moves e-se of the Rocky Mtns this evening an assocd cold front will be pushed swd initially arriving in the far nwrn CWFA around 06Z/Wed and then the far swrn reaches before 15Z/Wed. GFS has trended back farther s and it now has an open wave similar to the 00Z/Tue and 12Z/Tue ECMWF depiction of a sharp positively tilted open mid-level trof.
1201 AM EST Wed Jan 6 2021 Low height anomaly/eastern noam trough western edge remains directly overhead of Lower Michigan this evening. Most of the moisture will fall below the DGZ, thus any precipitation observed could vary between snow/rain or some patchy freezing drizzle at times.
332 AM EST Wed Jan 6 2021 A weak upper level low will remain parked over New England through tonight supporting abundant cloud cover and occasional flurries and light snow showers with spotty minor accumulations.
Upper ridge passed through our CWA today with mostly sunny skies. Next Pacific trough is now coming inland.
A cold front is crossing the adjacent Atlantic waters this evening from the NW. Elongated area of high pressure stretching from eastern Canada to Florida will produce a N/NE wind flow 10-12 knots resulting in choppy wind waves of 3-5 feet especially in the Gulf Stream.
325 AM EST Wed Jan 6 2021 A weak upper level low will remain parked over New England through tonight supporting abundant cloud cover and occasional flurries and light snow showers with spotty minor accumulations.
100 AM EST Wed Jan 6 2021 A weak upper level low will remain parked over New England through this afternoon supporting abundant cloud cover and occasional flurries and light snow showers with spotty minor accumulations.
1234 AM EST Wed Jan 6 2021 Dreary January conditions will persist through the next several days with mostly cloudy skies and chances for flurries and freezing drizzle expected. Some chances for light snow/flurries are possible as spokes of moisture continue to pivot westward associated with the area of low pressure located within the Gulf of Maine. Soundings are tricky to discern whether there will be enough cloud ice to produce flurries, therefore have mention of both flurries and freezing drizzle possible through Wednesday night. With this in mind, the upper level pattern is quite chaotic with no less than 5 different troughs/ridges over the CONUS on any given day.
For the lowlands, overnight temperatures are expected to remain in the low to mid 30s leading to rain or a rain snow mix with little accumulating snow.
353 AM EST Wed Jan 6 2021 A high pressure ridge builds from the west and north today. This ridge then persists over northern Ohio and northwest Pennsylvania through this weekend with quiet weather and seasonable temperatures.
140 AM MST Wed Jan 6 2021 At 21z a cold front was essentially bisecting the forecast area north to south and continuing to slowly move eastward. Temperatures will be back to near normal, with highs in the lower 40s and lows Wednesday night in the teens and 20s.
1126 PM CST Tue Jan 5 2021 An upper level trough is currently progressing eastward across the Rockies and will be moving into the Plains this evening. A modestly strong 80-100 kt upper jet will dig southward through WY tonight, and as it rounds the base of the trough late tonight and Wednesday morning expect the upper trough to become closed at 500 mb.
Currently we have a developing REX BLOCK (an upper high north of an upper low).
A low pressure system will get going over the southern plains and edge east toward the southern Mississippi Valley by late tonight.
Winds will be the main weather story for the day as a longwave trough moves through the central plains. Winds on the backside of the trough will be breezy at 20-35 mph with gusts over 40 mph at times. Highs today will be in the lower to mid 40s in the east and the upper 40s in the west.
High pressure will build into the region moving forward through the mid week period. The upper ridge over the Great Basin this evening will continue to build into Utah tonight.
231 AM EST Wed Jan 6 2021 Ridging aloft builds across the CWA tonight into Wednesday morning trapping a moist boundary layer beneath an inversion around 2 kft through Wednesday evening. Winds become more variable on Wednesday evening when the ridge axis moves overhead. If these features materialize they could result in patchy mist or freezing drizzle across the Keweenaw and near Marquette, but left it out of the grids for now. Both, and the GEFS (but less so), suggest an amplifying pattern with anomalous ridging building into the west coast. This would translate to downstream troughing across the Upper Great Lakes.
Ahead of the upper low a 30-40KT low level jet was aiding the northward transport of a low level moisture plume from the Southern Texas Gulf Coast into Central Texas. southerly flow will allow for the low level moisture plume to push into the CWA and combine with increasing warm advection. Increasing clouds and increasing low level moisture will help to keep low temps warmer overnight compared to the previous couple of nights.