Aikyam-Lab/Synoptic-Bench huggingface dataset:
414 AM CST Wed Feb 26 2020 Satellite imagery early this morning shows a broad area of stratus across northeast SD and eastern ND, behind a secondary upper trough progressing east through the region. Upstream, scattered light snow is being reported via radar and surface observations in an airmass that is slightly more saturated at the lower levels and has slightly stronger lift. Could see patchy flurries for east central SD early this morning, but with ceilings mainly in the 4-6 kft range and meager lift in comparison to areas further north, suspect that the column is not saturating into the lower levels. Temperatures will remain quite cool again today and tonight, as 850mb temperatures linger around -10C in the vicinity of the deep trough progressing through the central U.
There will be lots of clouds today, but clearing will take place tonight as high pressure builds over the region from the central and southern Plains.
A weather system will approach from the northwest this upcoming weekend, bringing cooler temperatures and the potential for light precipitation. No real change in the sensible weather the next few days a high pressure and offshore flow will keep above normal temperatures and dry conditions.
626 AM EST Wed Feb 26 2020 A cold front moving into the area this afternoon will exit to the east early tonight. Behind the cold front, drier and cooler air will dominate across the area through the weekend. A deep upper trough stretching through the MS River Valley this morning will slowly move east today, pushing a cold front into the area this afternoon. Cold front will be pushing east of the area early tonight. Cooler and drier air will then be pushing across the area for the remainder of the night.
Today and tonight: The lower Mississippi River Valley is caught between two surface systems today. and high pressure builds in over the Plains states. Aloft, a trough axis stretches from the Upper Midwest to the Gulf Coast, providing just enough lift to sustain some scattered showers through today. Upper level flow out of the northwest will keep conditions cooler than normal for this time of year as cold, continental air flows overhead.
/issued 305 AM CST Wed Feb 26 2020/ (Today and Tonight) Gusty north to northwesterly winds of 15-20 mph with gusts of 25-35 mph continue to occur early this morning as a strong surface pressure gradient is in place due to a strong high over the Panhandle and low pressure over the Gulf. The high moves over our region in the evening, resulting in the pressure gradient and winds quickly and dramatically weakening. The weak winds, clear skies and cold air mass tonight will result in a good radiational cooling setup, so expect lows in the low to mid 20s south of the Big Country and upper 20s in the Big Country.
Current temperatures range from the lower 20s in the mountain valleys to the 40s to lower 50s across the Central Valley.
However, given the timing during the morning commute and the novelty of any accumulating snow this winter, have issued an SPS mentioning the potential for a few slick spots on bridges and overpasses for the aforementioned Perryville to Fairfield corridor through 17z. By afternoon, temperatures will edge above freezing, ending the snow potential. The entire region should be dry by 0z Thursday as cold high pressure arrives. Lows tonight will fall into the lower to middle 20s with clearing skies.
we are seeing temperatures fall into the lower 20s and teens the past couple of hours. with a cooler start to the day and snow cover anticipated to linger across the western portion of the area today. think that temperatures across parts of the area this afternoon will actually be cooler than yesterdays readings. models are in good agreement with upper level ridging transitioning across the center of the country. although some guidance is notably even warmer.
Models are showing a very weak wave of low pressure sliding southeast through the area Thursday night.
327 AM MST Wed Feb 26 2020 High pressure will gradually build into the region through the remainder of the week.
Winds gusting over 30 MPH are producing sub-freezing wind chills and this will be the case for most of the morning.
Otherwise expect developing showers/storms by mid/late afternoon/evening affecting forecast area from N to S as cold front pushes across Peninsula.
339 AM CST Wed Feb 26 2020 A cold front has raced south through the region and has now cleared the Rio Grande. Wind speeds at Guadalupe Pass didn't quite reach warning criteria, therefore the High Wind Warning has been cancelled. Northerly sfc flow will be maintained throughout the day while a broad upper trof continues to swing into the eastern CONUS.
401 AM EST Wed Feb 26 2020 Deep southwest to west flow with plenty of moisture will continue across the region ahead of the mid/upper level trough moving into the eastern states today. Surface cold front associated with this system will move from northwest to southeast across the area late this afternoon and evening preceded and accompanied by showers and a few thunderstorms. Showers will wind down late tonight with skies becoming partly cloudy as much cooler drier air overspreads the region behind the front. The mid/upper level trough will remain over the eastern U.
314 AM CST Wed Feb 26 2020 A return to seasonable temperatures for the mid-week as an area of high pressure builds across northwest Ontario. Fairly widespread low/mid level moisture ahead of the area of high pressure will cause increasing clouds for much of the Northland today, with partly cloudy skies lingering through Thursday.
/issued 420 AM CST Wed Feb 26 2020/ Expect showers to continue throughout most of the day today as a broad trough currently over the Ozarks pushes its way towards the region. As the low moves eastward, the aforementioned trough will dig deeper, resulting in cloudy skies and gusty winds.
411 AM CST Wed Feb 26 2020 Short Term [Today and Tonight] This morning's surface analysis indicates that the reinforcing cold front extends through Lower St. Regional radar shows areas of very light overrunning precipitation progressing northeastward behind the cold front. The surface pressure gradient between the cold front and the high pressure behind it will result in elevated winds from mid-morning through the early evening hours. These northwesterly winds will also advect colder air into the region and result in highs only reaching the low to mid 50s despite clearing skies.
504 AM CST Wed Feb 26 2020 Water vapor satellite this morning shows a short wave trough moving across the Upper Midwest. These lapse rates will weaken this evening and the lift diminishes as the short wave trough moves past and only plan to carry the flurries into the early evening. Cooler air will continue to spread over the area with highs today in the 20s to lower 30s and then dropping back into the single digits and teens tonight for lows. Cooler than average conditions will hang on through the end of the work week with highs in the 20s. The long wave trough will continue eastward across the US giving way to a more zonal upper-level flow pattern and returning warmer air.
/issued 244 AM CST Wed Feb 26 2020/ Upper level low continues to lift north and east away from the area this morning. Northwest flow will continue today which will keep the cooler air in place allowing afternoon high temperatures to only climb into the 40's to low 50's. Northwest winds will continue to relax as we go through the day with southwest winds returning by this evening as lee troughing develops yet again. Upper level ridging will settle over the area for the weekend along with a tightening surface pressure gradient leading to warm, breezy, and quiet weather.
An upper ridge of high pressure will dominate the weather through the rest of the week. This means mostly sunny and dry conditions with warmer than normal afternoon temperatures.
531 AM CST Wed Feb 26 2020 Cold advection and drier air in the wake of the departing upper trof will result in temperatures well below climo today despite decreasing clouds.
An additional 2-4 inches is expected today across the advisory area, with the highest amounts along and east of I-69. The period of heaviest snow should be during the afternoon as the upper low is tracking through, so the evening commute will likely be a slow one for the LAN/JXN areas and points east. - Dry weekend with moderating temperatures Quiet weather is in store over the weekend as heights rise in response to a digging west coast trough and departure of the deep upr trough over the northeast U.
Consequently decreased clouds west and increased temperatures as it appears there will be a break in the clouds before the trough enters western ND later this afternoon. In western North Dakota where skies are clear, temperatures have dropped to the low single digits, well below what guidance had. Today will be warmer than yesterday due to continued warm air advection, with highs ranging from the mid 30s in the southwest to the lower 20s in the Turtle Mountains through the James River Valley. Lows tonight will range from the low teens east to the low 20s west, with mostly cloudy skies.
305 AM CST Wed Feb 26 2020 (Today and Tonight) Gusty north to northwesterly winds of 15-20 mph with gusts of 25-35 mph continue to occur early this morning as a strong surface pressure gradient is in place due to a strong high over the Panhandle and low pressure over the Gulf. The high moves over our region in the evening, resulting in the pressure gradient and winds quickly and dramatically weakening. The weak winds, clear skies and cold air mass tonight will result in a good radiational cooling setup, so expect lows in the low to mid 20s south of the Big Country and upper 20s in the Big Country.
This activity will diminish over the next several hours as the responsible mid-level trof shifts off to the east-southeast.
340 AM CST Wed Feb 26 2020 A cold front is currently moving through the area this morning.
A return to seasonable temperatures for the mid-week as an area of high pressure builds across northwest Ontario. Fairly widespread low/mid level moisture ahead of the area of high pressure will cause increasing clouds for much of the Northland today, with partly cloudy skies lingering through Thursday.
521 AM CST Wed Feb 26 2020 Early morning water vapor imagery and H5 heights show a slightly negative trough over the Central conus which has finally slowed its southward push and will start to become more neutrally oriented later this morning as it moves towards the Mississippi River Basin.
Confidence is not all that high for accumulations except for the higher elevation where less than a half inch is expected.
/Issued 1025 AM CST Wed Feb 26 2020/ Still a few reports of flurries from the lower cloud deck covering much of eastern OK and western AR this morning with the passage of a subtle wave in northwest flow. Indications are that steepening mid level lapse rates will develop this afternoon could result in at least isolated showers across northwest AR and perhaps far northeast OK through the afternoon, with a mix of precip types possible and primarily snow in the higher elevations of northwest AR. This activity will diminish over the next several hours as the responsible mid-level trof shifts off to the east-southeast.
126 PM EST Wed Feb 26 2020 Low pressure will move northeast through the region today, bringing a mix of rain and snow to the area. A cold front will then move east through the Ohio Valley this afternoon, changing precipitation to snow, and bringing cooler temperatures through the rest of the week.
Therefore, there is a slight chance of light snow most of the day Thursday across central North Dakota, where the trough will be centered over. Light snow remains possible across central North Dakota Thursday night before the trough washes out to the southeast.
1055 AM EST Wed Feb 26 2020 Low pressure will move northeast through the region today, bringing a mix of rain and snow to the area. A cold front will then move east through the Ohio Valley this afternoon, changing precipitation to snow, and bringing cooler temperatures through the rest of the week.
Mostly cloudy and murky conditions will likely persist through today as a series of subtle disturbances brush by the region along the periphery of a building ridge of high pressure off of the outer coast. The low level air mass over western WA remains moist with low clouds over much of the region this morning - IFR to MVFR cigs likely. Weak high pressure will keep winds generally light today and Thursday.
A positively tilted longwave trough centered over the southern Great Lakes will continue to progress eastward today into tonight. As the trough moves off the east coast, skies will clear on Thursday, but temperatures will remain cold as cooler air surges behind the trough.
The calm winds and clear skies will allow for radiational cooling to be maximized and temperatures will fall below freezing, ranging from the upper 20s to low 30s, across all of North and Central Texas.
252 PM CST Wed Feb 26 2020 (Tonight and Thursday) Northwest flow aloft will persist across the region through Thursday, as a large upper trough remains over the eastern half of the CONUS. At the surface, high pressure settle over the area tonight, then move off to the southeast tomorrow. Overnight lows will range from the upper 20s across the Big Country, to the mid and upper 20s elsewhere, with a few readings in the lower 20s possible. Sunny and warmer weather is on tap for Thursday, along with breezy southwest winds developing from late morning into the afternoon hours. Temperatures will be near or slightly below normal, with afternoon highs in the lower 60s.
242 PM CST Wed Feb 26 2020 Upper trough currently extends from the western Great Lakes region into the Tennessee Valley, with northwest flow aloft across the Plains. At the surface, high pressure stretches across the southern High Plains.
Light precipitation is expected to spread across the region this morning as the upper trough approaches, with weak radar returns already being observed over western Kentucky and Tennessee. However, warmer ground temperatures should help mitigate any impacts, as model guidance suggests road temperatures will not fall below freezing until after Midnight EST tonight. Temperatures this morning will start off in the upper 30s to low 40s, and then gradually cool throughout the day, falling into the low to mid 30s by sunset this evening. Winds will be quite breezy by this afternoon and into tonight as the pressure gradient tightens around the low, with sustained speeds in the 10-15 mph range and gusts of 30-35 mph possible.
allowing a sleet/snow mix in the higher elevations in eastern north Alabama. which combined with the low temperatures will cause wind chill values to be in the upper teens and lower 20's through mid morning. high pressure and clear skies will remain through the day.
/issued 1046 AM CST Wed Feb 26 2020/ A potent upper trough continues to move through the Mid-South this morning. /issued 420 AM CST Wed Feb 26 2020/ Expect showers to continue throughout most of the day today as a broad trough currently over the Ozarks pushes its way towards the region. As the low moves eastward, the aforementioned trough will dig deeper, resulting in cloudy skies and gusty winds.
These snow showers and flurries will wind down this evening across much of the area as a ridge of high pressure attempts to build in from the west.
Wind speeds continue to remain on the low side, which will limit the impact of this light snow.
1046 AM CST Wed Feb 26 2020 A potent upper trough continues to move through the Mid-South this morning. /issued 420 AM CST Wed Feb 26 2020/ Expect showers to continue throughout most of the day today as a broad trough currently over the Ozarks pushes its way towards the region. As the low moves eastward, the aforementioned trough will dig deeper, resulting in cloudy skies and gusty winds.
Daytime highs will trend warmer on Thursday as the upper ridge pushes a little farther east into the northern Plains. The 500mb ridge currently off the CA coast will move into the southwestern U.
Only minor accumulations still expected for the highest elevations.
1025 AM CST Wed Feb 26 2020 Still a few reports of flurries from the lower cloud deck covering much of eastern OK and western AR this morning with the passage of a subtle wave in northwest flow. Indications are that steepening mid level lapse rates will develop this afternoon could result in at least isolated showers across northwest AR and perhaps far northeast OK through the afternoon, with a mix of precip types possible and primarily snow in the higher elevations of northwest AR. This activity will diminish over the next several hours as the responsible mid-level trof shifts off to the east-southeast.
1115 AM CST Wed Feb 26 2020 Water vapor satellite this morning shows a short wave trough moving across the Upper Midwest. These lapse rates will weaken this evening and the lift diminishes as the short wave trough moves past and only plan to carry the flurries into the early evening. Cooler air will continue to spread over the area with highs today in the 20s to lower 30s and then dropping back into the single digits and teens tonight for lows. Cooler than average conditions will hang on through the end of the work week with highs in the 20s. The long wave trough will continue eastward across the US giving way to a more zonal upper-level flow pattern and returning warmer air.
Only minor accumulations still expected for the highest elevations. Upper trough will be on approach today with rainfall moving across the area during the day.
A passing short wave trough will maintain mid-level cloud cover over the east-central Oregon and w-central Idaho mountains today. Otherwise temperatures are 3-8 degrees warmer than yesterday with continued light winds.
Winds will stay generally light through tonight and then a weak cold front will move through on Thursday. Despite the switch in winds the cold air mass in place will slowly move eastward as winds in the 850 mb level will bring in slightly warmer air. Overnight lows should fall back into the lower to mid 20s and afternoon highs on Thursday will be in the mid to upper 50s. A warmup is still in store for this weekend as a strong ridge of high pressure builds east out of the northern and central Rockies.
High pressure is settling over South Central Texas this afternoon. Cooler, drier air is moving in with temperatures around 15 degrees and dewpoints 15 to 20 degrees lower than 24 hours ago. Lows will be below freezing over most of the CWA and down into the middle 20s in the Hill Country.
A weather system will approach from the northwest this upcoming weekend, bringing cooler temperatures and the potential for light precipitation.
Upper level trough digs over the Upper Great Lakes region tonight into Thursday. colder air filters into the region and temperatures are expected to be cooler than the last several days.
While this system has limited moisture to work with, we should get more sun tomorrow which will help to steepen the lower level lapse rates.
At 245 PM, the trough of low pressure that brought snow to central and western Nebraska yesterday was tracking through the Great Lakes Region.
247 PM CST Wed Feb 26 2020 The light snow/rain showers associated with a deep mid and upper level trof will move east this evening, with dry colder weather overnight as clouds decrease.
RG Chattanooga Airport, TN 29 45 31 49 32 / 20 0 0 20 10 Knoxville McGhee Tyson Airport, TN 29 42 29 44 31 / 20 10 0 40 20 Oak Ridge, TN 29 43 29 45 30 / 20 0 0 40 30 Tri Cities Airport, TN 28 39 26 41 27 / 70 50 0 40 30 TN.
(This evening through Thursday) As the upper low moves out, clear skies tonight will allow temperatures to fall into the 20s followed by a quick rebound tomorrow with temperatures reaching into the 60s.
1125 AM CST Wed Feb 26 2020 Satellite imagery early this morning shows a broad area of stratus across northeast SD and eastern ND, behind a secondary upper trough progressing east through the region. Upstream, scattered light snow is being reported via radar and surface observations in an airmass that is slightly more saturated at the lower levels and has slightly stronger lift. Could see patchy flurries for east central SD early this morning, but with ceilings mainly in the 4-6 kft range and meager lift in comparison to areas further north, suspect that the column is not saturating into the lower levels. Temperatures will remain quite cool again today and tonight, as 850mb temperatures linger around -10C in the vicinity of the deep trough progressing through the central U.
942 AM MST Wed Feb 26 2020 High pressure will gradually build into the region through the remainder of the week.
Winds will stay generally light through tonight and then a weak cold front will move through on Thursday. Despite the switch in winds the cold air mass in place will slowly move eastward as winds in the 850 mb level will bring in slightly warmer air. Overnight lows should fall back into the lower to mid 20s and afternoon highs on Thursday will be in the mid to upper 50s.
1106 AM CST Wed Feb 26 2020 Early morning water vapor imagery and H5 heights show a slightly negative trough over the Central conus which has finally slowed its southward push and will start to become more neutrally oriented later this morning as it moves towards the Mississippi River Basin.
359 PM EST Wed Feb 26 2020 Currently - Gentle to moderate breezes are feeding northward into a prefrontal trough aligned over the Florida Peninsula and the extreme eastern Gulf of Mexico. Meanwhile, a robust cold front continues to race southeastward into the southeastern Gulf of Mexico towards South Florida and the Keys. Forecast - The cold front will race southeastward through the remainder of this afternoon and begin working its way across the forecast area this evening. Expect rounds of showers and possibly a few thunderstorms in advance of this cold front. This will result in tapering off shower activity and cooler air will begin to filter across the area. The associated long wave trough will park over the eastern United States through the remainder of the week and into the weekend.
1126 AM CST Wed Feb 26 2020 Cold advection and drier air in the wake of the departing upper trof will result in temperatures well below climo today despite decreasing clouds.
TFJ A warm front will move through eastern Montana today with some clouds and a wind shift to the WNW this afternoon.
Water vapor imagery showing upper trough exiting the far eastern CWA with a few remaining snow showers/flurries affecting far eastern cwa. Subsidence behind trough enough to keep clouds at bay over much of the central CWA this afternoon. Meanwhile, northwest flow behind the trough is keeping some deeper moisture and flurries going into far west central MN. Dirty high pressure should move east into Thursday allowing for light winds.
The clouds and cold air advection was helping to keep temperatures in the low to mid 30s.
Temps will start to moderate Thur PM despite the low-level thermal ridge maintaining a wwd position underneath the NW mid-level flow aloft. An anomalous temp pattern does develop over the weekend when the mid-level flow becomes wly and the low-level thermal ridge expands e and n, approx +5 Sat and +10 Sun temp departures.
Northwest winds in the wake of a strong cold front will be the main concern for this forecast period. /issued 340 AM CST Wed Feb 26 2020/ A cold front is currently moving through the area this morning.
Ridging off the west coast with northwest flow over the PacNW streaming mid to high level moisture over the region and variable cloudiness.
508 PM CST Wed Feb 26 2020 (This evening through Thursday) As the upper low moves out, clear skies tonight will allow temperatures to fall into the 20s followed by a quick rebound tomorrow with temperatures reaching into the 60s.
552 PM CST Wed Feb 26 2020 Upper trough currently extends from the western Great Lakes region into the Tennessee Valley, with northwest flow aloft across the Plains. At the surface, high pressure stretches across the southern High Plains.