Aikyam-Lab/Synoptic-Bench huggingface dataset:
Water Vapor Satellite shows a positively tilted trough across the Northern Rockies to a strong closed circulation off the Northern California coast. This is why as the positively tilted trough crosses the region the models are not producing a lot of precipitation. The upstream trough is becoming increasingly split and is currently taking the form of an elongated trough extending from the southwest Oregon coast through Saskatchewan. As a result, it will continue to lose energy as the trough axis crosses Utah this afternoon and overnight.
413 AM CST Sat Feb 25 2017 In the upper levels a flat ridge will stretch across the southern tier of states as an upper trough moves down the CA coast to Mexico. This trough will quickly swing east but weaken as it passes across SE NM Sunday.
Southerly flow in the low-levels will remain intact on Sunday and this will lead to increasing cloud cover and a warming trend for all areas. We also expect a few showers to develop within the low-level warm air advection pattern and will mention a 20-30% chance for rain across most areas.
654 AM EST Sat Feb 25 2017 -RA will promote low MVFR/IFR stratus and reduced visibilities through this morning at KTRI and KTYS, before lifting to VFR levels by midday in wake of cold front.
430 AM MST Sat Feb 25 2017 Weak ridging in place over the northern Plains with positively tilted trof moving through the northern Rockies. At the surface, high pressure is located over the central Plains. Upper trof will approach the forecast area. With moderate surface heating and cooler air moving in aloft, lapse rates will steepen through the day, and induce some isolated to scattered snow and rain showers across the area. Upper trof crosses the area this evening, with snow showers continuing through midnight. Weak upper ridging returns to the area with cloud cover on the decrease during the day. A surface trof will cross the area mid to late day, with breezy westerly winds again across northwest South Dakota. Temperatures will be a few degrees warmer, in the lower 30s to lower 40s, coolest over snow covered areas.
Upper level low off the Pacific Northwest Coast prepared to introduce another round of precipitation across the district this weekend. Currently, the upper low is located some 300 miles west of the Southern Oregon Coast and tracking almost due south. The orientation of the flow aloft has the upper low in a positive tilt trof position with Northern California under the best dynamics in the area of difluences. Short term model analysis has the upper low turning east and toward California after dropping south of Eureka near 130W long. The trajectory of the upper low will place the district under difluent flow after 4 pm PST with a slight chance of precipitation during the later afternoon. Lates upper air observation and mountain surface data show the freezing level just above 4000 feet.
642 AM EST Sat Feb 25 2017 A cold front will push through the area this afternoon with gusty west winds. A cool and dry pressure ridge will build over the area Sunday.
951 AM CST Sat Feb 25 2017 Clear skies as high pressure has settled over the region behind the latest frontal system that moved through last night. Afternoon temps tdy look to be about 20 degrees cooler today than yesterday. High pressure building down from the Plains will be the dominant weather player today. /issued 420 AM CST Sat Feb 25 2017/ This morning's satellite imagery and surface analysis shows a surface cold front having exited our CWA. High pressure currently located over the Central Plains is forecast to build south and east through the day today. Northerly flow will usher in cooler continental air and the CWA could actually see high temperatures a few degrees below normal for the end of February.
1003 AM EST Sat Feb 25 2017 A cold front will push through the area this afternoon with gusty west winds. A cool and dry pressure ridge will build over the area Sunday.
Cold front moving across forecast area this morning brining only a few isolated showers. Daytime highs today will be 10 to nearly 20 degrees cooler than those of yesterday, and much more near normal for this time of the year. Afternoon highs will range from the lower 60s over far northern counties, mid and upper 60s across central portions of the forecast area, and upper 60s to lower 70s coastal and southeast portions of forecast area.
549 AM CST Sat Feb 25 2017 A vigorous mid-level trough centered over the MS Valley early this morning will advance east today in response to the progression of an upstream system from central Canada into the north-central CONUS. We will continue to see further modification of the low-level air mass with highs in the mid 30s north to mid to upper 40s south.
The cold front is currently located along the I-59 corridor. Despite full sunshine, breezy northwest winds gusting to around 20-25 kts and cold air advection bringing in 850 temperatures near 0C will keep temperatures much cooler than previous days. Highs will range from the low to mid 50s north to the 60s southeast, only a few degrees below normal. With good radiational cooling conditions lows tonight will be near or below freezing in many locations, with some 20s across the cooler areas in the north.
420 AM CST Sat Feb 25 2017 This morning's satellite imagery and surface analysis shows a surface cold front having exited our CWA. High pressure currently located over the Central Plains is forecast to build south and east through the day today. Northerly flow will usher in cooler continental air and the CWA could actually see high temperatures a few degrees below normal for the end of February.
Cold front currently moving east across the region, only an isolated shower or two in advance of the front. Winds decrease slightly this by this afternoon as high pressure begins to build into region and light north winds expected tonight. Cold front moving across forecast area this morning brining only a few isolated showers. Daytime highs today will be 10 to nearly 20 degrees cooler than those of yesterday, and much more near normal for this time of the year. Afternoon highs will range from the lower 60s over far northern counties, mid and upper 60s across central portions of the forecast area, and upper 60s to lower 70s coastal and southeast portions of forecast area.
123 AM EST Sun Nov 27 2016 A cold front is currently over the lake region, slowly progressing southward. The flow will shift to a north/northeasterly direction behind the front, ushering in slightly drier and cooler air.
1252 AM EST Sun Nov 27 2016 High pressure will keep dry weather over the region tonight through Sunday.
Once fog dissipates later this morning, attention turns to the strong Eastern Pacific trough now moving into the intermountain west.
Looks like there will be some freezing fog around tonight, with many locations north and west already at freezing with patch fog developing. TEMPERATURES WILL BE AROUND FREEZING OR BELOW AT MOST LOCATIONS, SO THERE MAY BE SOME FREEZING FOG.
344 AM EST Sun Nov 27 2016 A pressure ridge will extend through the forecast area through tonight.
1232 AM EST Sun Nov 27 2016 High pressure will allow for clearing through Sunday. Periods of rain with several waves of low pressure midweek. Period starts with high pressure heading east and an upper ridge in place. But as upper level across the northern plains deepens, a surface cold front approaches from the west.
1248 AM EST Sun Nov 27 2016 High pressure will bring decreasing clouds overnight with lows in the lower 30s.
A few rumbles of thunder are perhaps possible this afternoon when slightly cooler air filters in aloft and steepens midlevel lapse rates just a shade, but even the isolated T mention in the grids was a bit of a stretch.
Despite this, greater warm air advection lags with weak 850-925 mb thermal troughing lingering under residual mid level westerly flow.
1256 AM EST Sun Nov 27 2016 Cool high pressure builds into the region tonight through Sunday. High pressure over KY will slowly build east tonight. Winds are slow to become S on Mon as hi pres sfc/upper ridge aloft are slow to move off the coast.
318 AM CST Sun Nov 27 2016 Satellite imagery shows a well defined baroclinic leaf of a rapidly developing low pressure system in Southeast CO. This new system has a deepening upper level trough and jet stream support. Most of this moisture will be at the low levels and will be enough to allow for some drizzle and showers during the day today. The amount of moisture transport in the low levels that confidence is high that most areas will get wet, just don't see a lot of QPF though. After the dry line comes through in this afternoon, a dry tongue will move over the area and the low and mid levels will dry out.
318 AM CST Sun Nov 27 2016 High pressure centered over Tennessee early this morning. Aloft, upper ridging building into the Great Plains as deep upper trough moves from the Pacific Coast into the Rockies.
236 AM EST Sun Nov 27 2016 High pressure will allow for clearing through today. Periods of rain with several waves of low pressure midweek. High pressure is nudging into the region this morning. Skies will completely clear by this afternoon, but this will be short lived as mid and upper level clouds will increase with warm air advection out ahead of an approaching warm front. Period starts with high pressure heading east and an upper ridge in place. But as upper level across the northern plains deepens, a surface cold front approaches from the west.
1120 PM CST Sat Nov 26 2016 High pressure continues over the area with a low level inversion in place. High pressure continues over the area with a low level inversion in place.
1232 AM EST Sun Nov 27 2016 Sunshine will eventually return today as high pressure and warmer air moves over the region.
1148 PM CST Sat Nov 26 2016 One more quiet night with upper ridging remaining in place across the Plains, ahead of The trough now on the west coast. This trough should move into the Rockies tonight, with diffluent flow aloft beginning to spreading over the area by daybreak Sunday.
/issued 800 PM CST Sat Nov 26 2016/ High clouds across North Texs moving down the ridge into southeast Texas and southwest Louisiana. High pressure lies across the Northern Gulf Coast and the Lower Mississippi Valley this afternoon. Aloft, a ridge is building in from the west while a trough is pushing across the Pacific Coast. The low clouds are burning off now but highs will not have enough time to warm out of the 50s at some locations. Sunday will be dry, however the ridge will become centered east of the area allowing the return flow to begin ahead of the next system. Also on Sunday, The upper trough will move across the Rockies with low pressure developing in the plains.
The pressure gradient is really going to tighten up over southern WI as low pressure occludes over the Dakotas this evening.
In addition to the sub-quarter mile visibility reductions, sub-freezing temps are likely yielding slick spots on paved surfaces (especially bridges/overpasses). It could be awhile before visibilities improve this morning given the low level flow and amount of moisture trapped in the boundary layer. South/east central and southeast MN and west central WI will have the highest potential for sun this afternoon prior to the clouds entering from the west, and are therefore expected to see high temps a bit warmer (mid to upper 40s).
Expect southeasterly low level winds to increase somewhat overnight due to height/surface falls ahead of an approaching ua trough from the west. The mentioned low cloud cover may erode a bit through the evening, and the higher clouds may not cover much more of the forecast area than they already are until late tonight.
245 AM MST Sun Nov 27 2016 Current surface map places elongated area of low pressure from southern Montana into eastern Colorado. Upper level trof is moving into the central Rockies. Upper trof moves into the central/northern plains this afternoon with 700-500mb low closing off over central/eastern South Dakota this evening.
This low will continue to deepen and move northeastward across Nebraska today, which will tighten pressure gradient and as a result increase surface winds.
Looks like there will be some freezing fog around tonight, with many locations north and west already at freezing with patch fog developing.
324 AM EST Sun Nov 27 2016 A pressure ridge will extend through the forecast area through tonight.
Isolated to scattered showers and thunderstorms will be possible today as an upper level trough begins to approach from the west.
325 AM EST Sun Nov 27 2016 High pressure will allow for clearing through today. Periods of rain with several waves of low pressure early and mid week. High pressure is nudging into the region this morning. Skies will completely clear by this afternoon, but this will be short lived as mid and upper level clouds will increase with warm air advection out ahead of an approaching warm front.
302 AM EST Sun Nov 27 2016 Cool high pressure builds into the region through today.
Cloud cover may be slow to clear out again today given the low level flow but the southerly component to the wind should allow for at least a little warmup today. Surface pressure gradient tightens considerably overnight as a piece of the upper trough ejects out into the Central/Northern Plains.
1246 AM EST Sun Nov 27 2016 Aviation High pressure will continue to bring dry weather through Sunday evening.
234 AM EST Sun Nov 27 2016 Cool high pressure builds into the region through today.
432 AM EST Sun Nov 27 2016 High pressure will bring sunny skies to the region today.
As this front pushes south today, the overall flow pattern will begin to shift to the northeast, ushering in slightly drier and cooler air.
410 AM EST Sun Nov 27 2016 Sunshine will eventually return today as high pressure and warmer air moves over the region.
Southerly flow will gradually strengthen later today and especially tonight in response to tightening pressure gradient ahead of developing low pressure over the Plains.
440 AM EST Sun Nov 27 2016 Mid level ridge axis will shift east across the region today, providing a much more sunny end to the holiday weekend. Dry conditions in place will set the stage for a large ridge/valley split tonight. With the strong and shallow inversion developing, ridges in southeast Kentucky could stay mixed (generally above 2500 feet). If this is the case, winds could get rather gusty in the higher elevations.
00Z sounding data sampled 145kts of 300 mb wind over Las Vegas as the trough approached. Southerly winds will increase today in eastern Oklahoma and northwest Arkansas in advance of the deepening low and attendant cold front.
This ridge will continue to shift eastward through the day becoming centered along the Middle Atlantic coast tonight. Meanwhile water vapor imagery and latest upper air analysis show a ridge of high pressure currently over the Mississippi Valley will gradually shift east and build ahead of approaching early week trough. Under clear skies this morning, radiational cooling has allowed all of the area to drop well below freezing with the exception of Chattanooga which has finally gotten there in their latest observation. Although the day will start off cold, plenty of sunshine coupled with high pressure at the surface and rising heights aloft will create wonderful late November weather across the area.
1203 AM EST Sun Nov 27 2016 High pressure centered over the lower Ohio Valley will build over the local area tonight and Sunday. This high will shift to the Carolina Coast on Sunday night.
1205 AM EST Sun Nov 27 2016 High pressure will extend across the region into early week. A light north/northeast wind over Lake Moultrie is helping to keep Moncks Corner quite a bit warmer than surrounding areas. High temperatures will peak in the lower to mid-60s. Anticipate increasing cloud cover late Sunday night ahead of the developing low pressure system, which introduces uncertainty with overnight temperature drops.
230 PM MST Wed Jan 11 2017 Current surface analysis shows arctic front south of the forecast area, with high pressure centered over northern MT.
A low amp short wave/frontal trof spanning the Upr Midwest to the High Plains will be fed by a zonal jet streak extending from the Four Corners region to the Great Lakes. This will only force the ridge to reposition further south to a position that will strengthen an already subsident airmass over central FL. Furthermore, the trailing ridge axis is draped acrs the neck of the FL Peninsula resulting in a sharp H85-H70 subsidence inversion that will limit vertical motion blo 10KFT.
Even some lightning has been reported across the Great Basin with this trof. surface cold front has advected further West and South than expected resulting in colder temperatures this afternoon and readings only in the 20s/30s on the northeast plains. Secondary cold front will push into all of Northeast Colorado on Thursday morning with more colder air and increase in low level moisture during the afternoon hours.
241 PM EST Wed Jan 11 2017 Frontal boundary just north of the state is beginning to move Northward as a warm front and pulling the deeper moisture northward with it. Surface ridging from the Atlantic is building in underneath this exiting frontal system keeping us in very warm southerly flow.
1024 AM PST Wed Jan 11 2017 Much of the rain associated with a passing trough is now exiting the forecast area, leaving scattered showers for the rest of the day. A cold low pressure center will move southward later tonight, bringing another round of rain tomorrow morning, showers lingering through Thursday, and snow showers down to 3500 feet Thursday night.
1136 AM PST Wed Jan 11 2017 Much of the rain associated with a passing trough is now exiting the forecast area, leaving scattered showers for the rest of the day. A cold low pressure center will move southward later tonight, bringing another round of rain tomorrow morning, showers lingering through Thursday, and snow showers down to 3500 feet Thursday night.
The first minor trough that will enhance the snowfall will move over the area about mid-morning. The current satellite water vapor image is showing a trough of low pressure pushing into the West Coast with another storm system centered approximately 950 miles off of the Oregon coast.
/issued 320 AM CST Wed Jan 11 2017/ Southerly flow is once again established across the forecast area and this is bringing back a warmer and more humid air mass. Some patchy fog is noted over the near shore waters as the higher dew point air moving over cooler shelf waters in the mid 50s starting the sea fog development. Southerly flow at the surface and in the low levels will continue through the weekend, as forecast area will be protected from upper level ridging over the Gulf of Mexico, and upper level low drops down into the Southwest U.
With the main precipitation forecast to be across the southern areas, light dusting of snow will be possible in the higher peaks by Thursday morning. An upper low is forecast to skirt southward just off the coast and will bring a chance of thunderstorms in addition to showers as it moves through. Snow levels will lower in time for the system expected tomorrow, which will allow a dusting of snow over the highest elevations. The highest peaks in Big Sur area could pick up a few inches of snow.
Early tomorrow morning we will see a cold front moving into the Panhandles from the northwest. freezing rain.
Flow aloft veering this afternoon and evening to more northwesterly as a fast moving potent upper low moves from Saskatchewan southeastward into southern Manitoba tonight.
159 PM MST Wed Jan 11 2017 Currently across the Tri-State region there is a cold front continuing to push south through the area. Temperatures will drop into the low teens to low 20s over the region tonight and winds will shift slightly at less than 10 mph. The upper level flow shows an approaching low pressure system in the western CONUS. Thursday brings dry conditions as well, with increasing cloud cover during the day with the approaching trough in the western states.
The surface front that is responsible for showers just north of our area has begun to lift north as a warm front this morning. Max 850mb temps today of 10-12C indicate highs will be in the low to mid 70's based on local studies. Temperatures tonight should remain in the low 60s areawide, unprecedented for this time of the year considering average highs for Jan 11 are in the mid 50's.
Due to a strong pressure gradient that exist from the Southern Plains and the Lower Mississippi Vally.
A strong cold front will enter far northern Oklahoma around 6 pm this evening.
Will cancel the high wind warning as winds below criteria overall and will continue to decrease though a few gusts around 55 mph still possible for the next couple hours in the Bordeaux area. Some light snow noted behind the front with snow continuing over the higher mtns of se Wy. Arctic boundary should settle along the higher terrain by this afternoon thus the warmest temperatures will be out west.
High pressure will drop southeast thru SW half of ND today with a west to northwest wind in the 5 to 12 mph range. Winds will turn southwest tonight and increase in speed ahead of cold front which will drop southeast out of Canada. A cold front will drop south thru the area Thursday with a period of gusty winds in the 20-30 mph range.
1251 PM CST Wed Jan 11 2017 Boosted winds for a few hours this afternoon with a strong 25-35kt wind max aloft behind the cold front. Due to limited moisture, generally less than an inch of total accumulation is expected with the highest amounts near the South Dakota/Nebraska border.
The cold front has moved through the region quicker than originally anticipated. Cold front across central Nebraska this morning will sag southwest into the forecast area today.
A relatively strong storm system will affect the region beginning Thursday leading to cooler temperatures heading into the weekend.
The flow is coming directly from the Arctic on the west side of a large upper low that is over the NW Territories, Northern Saskatchewan, and Manitoba. This flow combined with Arctic high pressure moving through Northeast Montana this morning is bringing bitter cold temperatures to the forecast area. The next Arctic high pressure will diminish winds by noon on Thursday.
Surface and low level high pressure are centered near Bermuda, with southeasterly flow locally. At the upper levels, the ridge is centered over the northern Gulf, with zonal flow aloft of our area. Under this pattern, we continue to see mostly clear skies, which has allowed us to warm up into the low 70s today. In parts of south central GA, which is closer to the low level high pressure, winds will calm overnight and may allow another round of fog to develop by the early morning hours.
1244 PM EST Wed Jan 11 2017 Issued at 1228 M EST Wed Jan 11 2017 A low pressure system will move northeast across the Great Lakes tonight and Thursday causing rain and isolated thunderstorms in our area.
200 PM EST Wed Jan 11 2017 A warm front pushes north on tonight.
However, should Canadian observations show the higher gust potential of the ECMWF/GFS, wind gusts in excess of 45 kts may be possible and true ground blizzard conditions could result.
and a ridge centered over the northwest caribbean that extended across cuba and out over the Atlantic all resulted in quasi-zonal flow over most of the nation. Surface - High pressure was in the northern high plains. and high pressure offshore eastern Canada ridged along the eastern seaboard and across Fl to the Gulf of Mexico. The Pacific coast upper low dropping down into central CA while the Canadain low shifts into Ontario will build the upper ridge over the east Gulf and FL. The center of the Atlantic high drifts south while continuing to ridge into the Gulf with the ridge axis lifting into south AL/GA. with modest amounts of moisture mainly in the lower levels.
1041 AM MST Wed Jan 11 2017 Current surface analysis shows arctic front south of the cwa, with high pressure centered over northern MT. Warmest temperatures will be in the higher elevations of the Black Hills.