Aikyam-Lab/Synoptic-Bench huggingface dataset:
/issued 147 PM CST Mon Nov 27 2017/ Upper ridge centered over Mexico this morning stretches northward across the country to Canada. However the next upper trough has moved ashore the west coast. This trough will move quickly east reaching the Southern Rockies by Tuesday morning and crossing the Panhandle during the day.
The fog should dissipate fairly quickly by mid-Tuesday morning as southerly winds increase in response to an upper level low moving out of the southern Rockies into the southern U. We will see another round of above normal high temperatures tomorrow given plenty of afternoon sunshine and southerly flow in the low-levels. Highs will range from the lower 70s to near 80. The above mentioned upper low continues to move eastward across Oklahoma Tuesday night. Surface anticyclogenesis behind this low will help usher a cold front into south central Texas late Tuesday night.
1011 PM EST Mon Nov 27 2017 High pressure over the area tonight will move offshore Tuesday.
535 PM CST Mon Nov 27 2017 Pressure gradients will tighten up strongly this evening as a cold front moves into the central and northern Plains, heading toward central IL Tuesday afternoon. Timing of the front looks as if it will produce another quite warm day Tuesday especially the Illinois River southeastward where highs should reach the low to mid 60s, while afternoon cooling to the northwest should limit highs to around 55 to 60.
The ridge center will shift from over Eastern Conus to along the Northern Atlantic Seaboard by midday Tuesday.
Upper level low pressure trough out west was bringing thick high level clouds to the region this afternoon which has kept temperatures down along with a shallow mixing layer. At the surface, a trough/cold front across the cwa this afternoon will be moving east tonight with winds becoming northwest bringing in cooler air for Tuesday. As the upper level low pressure trough passes by later tonight/early Tuesday, the mid and high level clouds will also move east.
Temperatures this afternoon were in the mid 50s to lower 60s across the area thanks to strong southerly winds in association with a deepening low pressure system moving into west-central Manitoba. The trailing cold front with this system was still across the western Dakotas, but will reach the MN border around 6PM this evening. Northwest winds will increase, especially in the afternoon as high pressure approaches from the west and the pressure gradient remains tight between the high and the departing low to our north. The weather will continue to be warmer than normal for this time of year as we head into early December.
The main fly in the proverbial ointment will be if our newly-established light south wind kicks up to a few knots and mixes the warmer temps in the inversion layer down to the surface.
855 PM EST Mon Nov 27 2017 High pressure will build overhead tonight and move to the east by Tuesday.
Surface and mid-level high pressure will continue to dominate over Deep South Texas and the Rio Grande Valley, producing VFR conditions through the next 24 hours. /issued 150 PM CST Mon Nov 27 2017/ SHORT TERM (Tonight through Tuesday Night): A broad area of strong mid/upper level high pressure over much of Mexico will maintain a dry west to northwest flow aloft over deep south Texas through the period. At the low levels, weak southeasterly onshore flow will prevail. Surface dew points are slated to slowly increase over the next 24-36 hours with patchy fog possible for many locations early Tuesday morning as a weak cold front approaches from the north.
657 PM EST Mon Nov 27 2017 High pressure will build across the region tonight through early Tuesday. A warm front will cross the region later Tuesday.
515 PM CST Mon Nov 27 2017 Record warm temperatures being experienced in portions of the forecast area today, ahead of a cold front that was moving through the western Dakotas late this afternoon. Cold front will move into northwest portions of the forecast area after 00UTC, and will move south of the I-80 corridor by 12UTC. Record low maximum temperatures generally in the upper 40s, so though minimums will be 15-20 degrees warmer than normal, still will not be record setting. Temperatures on Tuesday will be about 15 degrees cooler than today, as diurnal mixing offsets cold advection, especially across southern portion of the forecast area.
939 PM EST Mon Nov 27 2017 High pressure builds in from the north tonight, and offshore on Tuesday.
908 PM EST Mon Nov 27 2017 High pressure in control through mid week.
515 PM CST Mon Nov 27 2017 Ridge over Midwest is on the move to the east with the trough along the Front Range quickly following in its exit.
6pm Update: Cold front has pushed through the region and clearing skies continue across Northeast Montana. Proton Previous Discussion: The short term is characterized by a return of weak ridging to the region. Winds in the wake of the cold front will continue to slowly diminish overnight, but will not get down to light and variable levels.
The vigorous cold front that pushed through Las Vegas earlier this afternoon has exited the forecast area. For now I have left all advisories in place since there were still areas gusting 35-45 MPH at this hour in most of the highlighted zones.
/issued 534 PM CST Mon Nov 27 2017/ Upper level ridging will persist over the Mid South through Tuesday. A closed upper level low pressure system now over the western states will move east and weaken through mid week.
731 PM EST Mon Nov 27 2017 High pressure slowly shifts off the coast through Tuesday.
/issued 524 PM CST Mon Nov 27 2017/ 00Z TAFS High pressure remains firmly in control across the area this evening resulting in clear skies and very light winds. Southerly winds return by mid morning Tuesday as the high departs to our east which will increase atmospheric moisture and result in a developing low level ceiling around 025 that will continue through Tuesday night. Temperatures will cool rapidly after sunset, but on average should be about five degrees warmer tonight than last night.
Strong southwest winds have developed this afternoon, and a cold front will move through the area tonight.
/issued 255 PM CST Mon Nov 27 2017/ Upper level ridging will persist over the Mid South through Tuesday. A closed upper level low pressure system now over the western states will move east and weaken through mid week.
02 UTC surface analysis shows an area of high pressure across Eastern North Carolina. Overnight, this area of high pressure will gradually drift eastward and by morning, where winds aren't calm, a light easterly wind should be in place.
Cyclonic circulation around a broad positive tilt mid/upper level trough covers the GOMEX, with embedded short waves noted south of LA and near the FL- GA border. High clouds in the divergent SE flank of the trough had been covering the SERN CWA much of the day, but have thinned and shifted east a bit since sunset. Persistent onshore flow with gradual moistening in the lower levels will allow isold-sct showers to move onshore the coast during the mid week.
Morning lows still look good with freezing temperatures expected over much of east Mississippi. /22/ Prior discussion below: Through Tomorrow: Dry weather continues today through tonight under the influence of high pressure across the region. Most locations will warm into the low 70's under mostly clear skies.
921 PM EST Mon Nov 27 2017 High pressure will build across the region tonight through early Tuesday. A warm front will cross the region later Tuesday.
A passing trough and front will likely bring a period of MVFR CIGS to southern Wisconsin between 13-19z Tuesday.
Overnight lows will drop near to slightly above freezing, from the upper 30s to lower 40s. Breezy northwesterly winds to 10 to 15 mph will be possible with gusts to around 25 mph in the afternoon hours as the ridge axis moves over the area.
833 PM EST Mon Nov 27 2017 Overnight and tomorrow will feature weak troughing in the Gulf of Mexico and high pressure just off the coast of the New England states.
Some cooling will occur Tuesday behind a departing low pressure system.
Showers have mostly tapered off overnight and a ridge will continue to build into the area through today. A weak warm front will move by to the north and northwest this evening. This is followed dry weather across the area tonight through the weekend as the upper level ridge strengthens. Breezy winds are expected over the ridges as offshore east to southeast flow develops. A strong inversion will be present resulting in warm temperatures over the mountains and cooler temperatures in inland valleys.
Today Through Saturday Night Radar trends indicate a weakening trend ongoing across south Arkansas where the center of the upper trough is now passing through. By mid morning the trough axis will be east of our forecast area and precipitation should rapidly come to an end. However, this could be too optimistic, especially in those places that receive a decent amount of sleet and/or freezing rain. Northerly winds will continue to pump cold air in from the north as high pressure is anchored over the upper midwest.
A ridge of high pressure will build into Oklahoma from the north through Saturday morning. For the next three or four days Oklahoma's weather will be most influenced by a persistent low pressure from Hudson Bay to the Great Lakes.
Arctic high pressure is moving into the upper midwest with clearing skies and brisk northwest winds. Northwest flow will continue with arctic high pressure with a disturbance bringing chances of light snow this weekend.
The lower elevations that received mostly rain will continue have localized issues for standing water and the potential for rock and mud slides.
Used the low temperatures from this morning as the basis for the low temperature forecast for tonight into Saturday morning, lowering temperatures from these observations across the James River Valley where the high is expected to be centered. Widespread temperatures of 20 to 30 below are being reported as of 10 UTC across the northwest and central, with relatively warmer readings of 5 to 15 below southwest with the impacts of cloud cover and light snow that will linger through the morning.
Cooling trend is expected in the wake of yesterday's front as upper level troughing across most of the United States allows another surge of cold high pressure across our area overnight into early Saturday.
Upper level ridge over western North America builds and shifts a little east through 12Z Mon. Upper level trough over the Canadian Archipelago will move south into the Northern Plains by 00Z Mon. Light snow with approaching upper trough is forecast for Sun. Southern stream will undercut upper ridge in the west late in the period. Long wave trough over eastern North America will shift into eastern Canada/New England by Thu. Long wave ridge over western North America flattens by Thu. Upper ridge western North America will move over the area by wed and will moderate temps.
Upper level ridge builds over the Pacific NW tonight through Saturday for generally dry conditions. However, west to southwest winds will increase along the Rocky Mountain Front as lee troughing strengthens accompanied by a continued mid-level jet stream.
This will be accompanied by weak isentropic upglide and low pressure deficits in the 290K and 295K surfaces. The layer from 650mb-800mb is forecast to be saturated, although limited by a layer of -7 to -10C temperatures in the lower half of the saturated layer. A warm front will develop across western Nebraska to the south of the low, and will advance east across the area Saturday night.
340 AM PST Fri Jan 12 2018 High pressure aloft near the West Coast will bring dry weather with a warming trend through the weekend.
933 AM EST Fri Jan 12 2018 A cold front coupled with waves of low pressure will push through today, bringing a wintry mix of precipitation, changing to snow by tonight as much colder air filters in.
The approaching cold front looks to move through South Florida tonight, and should be exiting in the pre-dawn hours.
With mid level troffing in the central and eastern conus, we can expect a couple rounds of arctic air.
The area of high pressure will build more solidly into place across the forecast area today, with single digit highs likely in most areas (struggling to eclipse the zero degree mark over west central MN near Alexandria).
A cold front will sweep through late today/early this evening.
/Issued 305 AM CST Fri Jan 12 2018/ Surface observations/radar confirm some lingering flurries across northwest AR and this activity will end early this morning as the mid-level trof axis shifts east.
High pressure off the coast of Baja will build northward into California during the next few days and bring dry weather with milder than normal afternoon temperatures.
Obs show that a strong cold front is on our western border, with a 30+ temperature drop from CHA to MRC. This area may maintain deeper moisture from the comma head into tonight, and with temps aloft dropping below freezing while this moisture moves in, there is concern that higher elevations of Claiborne, Wise, and Lee counties could see some icing/sleet between 8 pm and midnight the changeover to snow after midnight.
High pressure will build over California today and bring dry and mild weather to the area through the Martin Luther King Jr.
High pressure heading south today with strong cold air advection continuing to push into the region early today.
Winds are expected to remain under 12kt, and shift from the S/SW to the N/NE late in the period as a cold front begins to move through the area. /issued 345 AM CST Fri Jan 12 2018/ WV imagery shows a deep upper-lvl trough moving thru the MS Valley, leaving the wrn CONUS under NW flow aloft. This warmup will be brief, however, as a cold front backdoors the region overnight, taking temps Sat afternoon to below-normal, especially NE zones.
Sharp and deeply-reflected mid- and upper-level system with strong surface cold front just moving into eastern MS this morning will continue progressing rather quickly from west to east and will exit east of a Destin, FL to Greenville, AL line by mid- to late morning. A north-south oriented strong cold front currently advancing eastward across Mississippi will be located over the midsection of the forecast area at issuance time and quickly exits to the east during the morning.
/issued 445 AM CST Fri Jan 12 2018/ The latest cold front has moved through the region as temperatures range from the upper 20s across the northern tier of the state to the upper 30s across southern Louisiana and southeast Texas. Clear skies and light winds will allow for temperatures to fall below freezing around midnight of just thereafter and remain below freezing through sunrise.
Temps mainly on track to reach into the lower 70s north to the lower 80s south. The cold front will sweep across the region late today and early tonight shifting winds to west to northwest with gusts up to 30 knots possible.
Winds will be light and variable as high pressure moves across the greater region.
A weak warm front will lift northeast across the area Friday night into Saturday morning for a bit more rain.
445 AM CST Fri Jan 12 2018 The latest cold front has moved through the region as temperatures range from the upper 20s across the northern tier of the state to the upper 30s across southern Louisiana and southeast Texas. Clear skies and light winds will allow for temperatures to fall below freezing around midnight of just thereafter and remain below freezing through sunrise.
An upper level trough is currently pushing through the the area. Lows tonight will fall into the lower teens again with wind chills around zero. The first upper level trough will track through the area Saturday, though no preciptiation will occur with the passage of this system. The trough will send a reinforcing shot of cold air into the area keeping highs in the 20s Saturday afternoon.
/issued 350 AM CST Fri Jan 12 2018/ SHORT TERM (Today through Saturday): Winds have decreased across deep south Texas this morning as high pressure continues to spread out over the area. Cooler and drier weather can be expected for today with high temperatures in the 60s and sunny skies.
A low pressure system moving through the eastern Tennessee and Ohio Valleys today will bring accumulating snow and ice to the area today.
Meanwhile, Arctic high pressure has brought clear skies and bitter cold temperatures to the northeast part of the forecast area overnight. With the high pressure and cold air remaining in place today and tonight, wind chills in the north will continue to be -40 or colder at times through tonight. Temperatures will be somewhat warmer in SW Phillips and Petroleum Counties tonight as those areas maintain more cloud cover closer to the quasi- stationary front to the west. On Saturday, high pressure moves to the east and frontal boundary moves to the east over the forecast area bring warmer temperatures. Those warmer temperatures will remain over the area Saturday Night.
Widespread temperatures of 20 to 30 below are being reported as of 10 UTC across the northwest and central, with relatively warmer readings of 5 to 15 below southwest with the impacts of cloud cover and light snow that will linger through the morning.
Dry weather is expected elsewhere with some patchy morning fog in the lower valleys. Another high amplitude ridge will be produced in the West by deep anomalous troughing over the eastern 2/3 of the NOAM and the E.
This will help to erode the cold airmass that arrived yesterday across the Caprock where highs should climb into the low 60s while the Rolling Plains will hang on to the cold airmass a bit longer and remain in the upper 40s to lower 50s. Another cold front will push over the area Saturday dropping highs back into the upper 30s to mid 40s as easterly flow pulls cold air into the region through the day.
Showers ahead of prefrontal trough and cold front to the west are moving into se Ga and ne Fl now which should limit instability today. Showers will continue to increase across the area with only isolated thunder possible this afternoon despite strong dynamics with upper trough. Showers will decrease with passage of prefrontal trough by late afternoon. Cold front will push across the area this evening bringing in colder temperatures for the weekend. MVFR cigs will likely linger tonight behind cold front with winds shifting to the west. Increasing ssw winds today ahead of approaching cold front will continue Advisory offshore.
We can thank a return to broad upper troughing along the northern tier, in place behind quite the impressive Arctic cold front that marched through the area roughly 18 hours ago. At the surface, broad and rather strong low level ridging centered across southern Alberta/Saskatchewan early this morning will gradually drift southeast across the local area by Saturday night, with the coldest air of this round arriving for Saturday into Saturday night.
A north-south oriented strong cold front currently advancing eastward across Mississippi will be located over the midsection of the forecast area at issuance time and quickly exits to the east during the morning.
Snowfall will linger across the West Central and Boise Mountains today as some residual moisture remains from the recent trough. Building northwest flow will continue as a ridge develops over the Intermountain West.
Freezing drizzle has ended across far southeast WI about 1-2 hours ago, however effects remain. Passing mid-level trof setting off scattered flurries and a few light snow showers. Patchy -zl accompanied passage of low level trof over eastern CWA overnight. Trof will be exiting far southeast in next several hours so -zl should end. Scattered flurries however will continue into the early morning as low level cold air advection and lingering rh along with lingering mid-level trof affect the area. Forecast confidence is high: Mostly sunny skies and below normal temperatures are expected Saturday under high pressure.
507 AM CST Fri Jan 12 2018 Deep upper trough was edging toward the Mississippi River early this morning. Surface obs and radar mosaics continue to indicate some sleet mixing in with the snow at times, though the freezing rain reports have been diminishing some. This trend will continue through sunrise, then the precipitation will start to get pushed east as the trough approaches.
A cold front is quickly approaching from the west, and will have a significant impact on sensible weather conditions today. Forecast soundings indicate very strong cold advection at 925mb beneath an above freezing layer around 850mb which will be warm enough to melt anything falling from above. Additionally, the potential for precip generated from synoptic lift above 850mb is rather questionable due to a weak deformation zone associated with the open-wave trough. In the low-levels, steep lapse rates may produce enough lift for light precip which could fall in the form freezing drizzle, small ice pellets, or flurries with 925mb temperatures of -5C to -10C.
320 AM PST Fri Jan 12 2018 Dry conditions and above average temperatures are expected today and through the weekend as high pressure builds into northeast California and western Nevada. High pressure builds over the Sierra and western Nevada today bringing dry and mild conditions for the weekend. As the ridge strengthens over the region today, surface pressure/temperature gradients will allow for easterly winds to develop across the ridges late tonight into Saturday morning.
Only in our region can we see a cold front move through and 70s several days later.
Also, with temperatures near freezing this morning, there could be some slick spots on area roads. Expect lows to stay above freezing tonight, and there may be some patchy drizzle with the increase in low level moisture.
/issued 323 AM CST Tue Jan 9 2018/ (Today and Tonight) Much warmer across West Central Texas today as an upper level ridge shifts across the area. Highs will climb into the low to mid 70s with south winds starting to increase.
415 AM PST Tue Jan 9 2018 Widespread precipitation will taper off to showers today as the low pressure system moves into SoCal. Accumulating snow will be limited to the just the highest elevations.
412 AM CST Tue Jan 9 2018 The main focus again early this morning is on impacts associated with the passage of a potent mid-latitude cyclone that is currently approaching California from the eastern Pacific. Before all of the excitement tomorrow, a progressive upper ridge and breezy southwesterly winds will secure a mild afternoon today. Regardless, temperatures should make it into the lower to middle 70s, with spots flirting with 80 degrees. Another mild night will follow tonight as southwesterly flow aloft begins to increase ahead of the quickly approaching upper low. A Pacific cold front will move through during the day, tempering warming somewhat, but highs should still climb well into the 60s on the Caprock, with lower to middle 70s common further east, and a few low 80s not out of the question where downslope is maximized.
Not expecting much improvement as we move forward through the day, with only low MVFR cigs returning this afternoon over E TX/extreme SW AR/Wrn LA, and IFR cigs lingering over Scntrl AR/Ncntrl LA as sfc ridging remains in place across the region. Can't rule out the Wrn edge of the low stratus shield over Ecntrl TX mixing out by afternoon, but do not believe it will mix out as far E as TYR and thus have maintained MVFR cigs in place here for the afternoon/early evening. Overnight the clouds remain and winds will be shifting to E and SE by this time tomorrow making for a warmer trend into midweek.
Fog and freezing fog resulting in VLIFR conditions across the AR TAF sites at the onset of the period. /Issued 356 AM CST Tue Jan 9 2018/ Areas of fog and freezing fog ongoing this morning primarily across far E OK and western AR.
657 AM EST Tue Jan 9 2018 There will be increased moisture and a moderation in temperature associated with an onshore flow between the ridge shifting off the East Coast and low pressure moving from the Lower Mississippi River Valley into the northeast Gulf of Mexico today.
545 AM MST Tue Jan 9 2018 As the low pressure area moving through the southwest U.