Aikyam-Lab/Synoptic-Bench huggingface dataset:
These bands will slowly push east during the remainder of the afternoon and early evening before we lose the low level instability and synoptic forcing from the upper level wave.
Temperatures will hang on in the lower 30s through the evening and then start dropping into the lower 20s inland overnight. There is a trough over the eastern half of the US and a ridge over the western half.
The upper low continues a slow trudge east across Kansas with wrap-around moisture still pinwheeling down onto the CWA. High pressure and dry conditions will ensue for the Wed/Wed night timeframe with near to above normal temps.
220 PM PST Tue Feb 25 2020 High pressure remains in control this week over western Nevada and the Sierra with dry conditions, light winds, and above average high temperatures. Low pressure looks to impact the region this weekend with gusty southwest winds and the chance for rain and snow showers. Not much to look at out the window this afternoon weather-wise besides for some high cirrus clouds moving in from the west- northwest as high pressure remains in control over the region.
Today through Wednesday A low pressure system skirted the forecast area, just off to our west and south today. High pressure will filter in behind the departing upper level disturbance, keeping us dry through midweek. Highs on Wednesday should remain in the lower to mid 30s under mostly sunny skies.
The weak ridge of high pressure that brought fair weather to the Northern Rockies today will be short-lived. A ridge of high pressure slowly begins to build over the Northern Rockies for the latter part of the work week.
Low temperatures will be in the low to mid 40s. A longwave trough axis extending through the Central Plains will slide east through the Mississippi River Valley and into the Mid-Atlantic states by tomorrow night. A piece of energy diving through the Great Basin and into the base of the trough was noted on latest water vapor imagery.
Thereafter, cooler and potentially showery conditions are expected over the weekend.
412 PM MST Tue Feb 25 2020 Broad trough covers the CONUS, with the upper low over western KS. As the trough shifts east, an upper ridge will build over the western CONUS, bringing drier and slightly warmer conditions for Wednesday. Kept highs for Wednesday towards the lower end of guidance, taking into account fresh snowfall and increasing clouds.
A weather system will approach from the northwest this upcoming weekend, bringing cooler temperatures and the potential for light precipitation. Offshore flow over the region this afternoon has allowed for temperatures to be 5 to as much as 15 degrees warmer compared to this time yesterday. A ridge of high pressure and weak offshore flow is likely to persist through much of the remainder of the week.
320 PM CST Tue Feb 25 2020 Northwesterly flow aloft will bring cooler temperatures to the region for the next few days. High pressure sliding southward tonight will bring cold temps with lows dropping into the single digits above zero. Temperatures could be cooler if skies are able to clear some tonight. A weak low pressure system crossing western South Dakota Wednesday night could bring light snow to far western CWA.
Northwesterly flow aloft will bring cooler temperatures to the region for the next few days. High pressure sliding southward tonight will bring cold temps with lows dropping into the single digits above zero. Temperatures could be cooler if skies are able to clear some tonight. A weak low pressure system crossing western South Dakota Wednesday night could bring light snow to far western CWA.
Meanwhile, a mid latitude trough is working its way eastward through the central United States. After another warm day tomorrow, a cold front will blast southeastward through the Keys through the evening hours. Surface winds will first turn west ahead of the prefrontal trough, then shift northwestward while freshening.
This evening through Wednesday night Except for some lower clouds between 3 and 4K from RKS to Casper, most of the low clouds and snow have exited to the east and southeast of the area.
516 PM CST Tue Feb 25 2020 (This evening through Wednesday) Cold upper low slowly progressing southward into Oklahoma this afternoon, with associated light rain showers crossing the border. Outside of very localized melting effects in small bands of precip, to get enough lower level cold advection in order to see all snow will take the passage of cold front that is depicted by models as broad pressure trough, currently moving into far northwest Oklahoma. However, given temperatures close to freezing and near surface soil temperatures in the 40s and 50s, most accumulations will begin to melt fairly quickly.
/issued 239 PM CST Tue Feb 25 2020/ An upper level low is positioned over the central CONUS this afternoon with a trailing trough axis extending into the desert southwest.
The next strong cold front continues to sag across the FL Panhandle, currently analyzed just west of Tallahassee. (previous) As the cold front sags south, we are looking at considerably cloudy skies with on and off showers and embedded thunderstorms throughout the day. We remain cooler north with afternoon temps reaching around 80 degrees, further south it warms into the low 80s (mid 80s in Martin County). Cold front approaching the FL panhandle this eve will begin to increase low/mid level clouds across northern terminals along with showers and a low end chance for an isolated thunderstorm overnight. A cold front is forecast to move over the local waters, bringing numerous showers and isolated lightning storms throughout the day.
101 AM EST Wed Feb 26 2020 A warm front will continue to lift northward through tonight ahead of an approaching cold front. The cold front will be in the area Wednesday.
Most showers have been over the Lower Keys so far, leaving a few places with a couple hundredths of an inch of rain and other places dry. A cold front is now emerging over the northwest Gulf. With a high amplitude meridional upper trough sweeping from the Mississippi Valley to the U. Despite the late winter date on the calendar, this is expected to usher in one of the cooler air masses of the season. A dull high pressure ridge axis from the Keys to south of Bermuda will support gentle to moderate southerly breezes overnight, becoming southwest to west on Wednesday. A cold front will blast through Keys waters Wednesday evening and night, bringing fresh northwest to northerly breezes.
1019 PM MST Tue Feb 25 2020 As expected, snow is slowly coming to an end as the low pressure and wraparound flow continue to shift eastward. Webcams do show snow continuing over Rabbit Ears Pass and the higher elevations along the Continental Divide. Even though the low has shifted well to the east, the surface pressure gradient remains tight and is causing some gusty winds across the region. Low temperatures will be anywhere from 10 to 20 degrees below normal especially in the lower valleys (Gunnison and Craig). For tomorrow, high pressure starts to build in. High temps may be a few degrees warmer than today but still, cool for this time of year.
Chattanooga Airport, TN 43 53 29 45 28 / 0 40 30 0 10 Knoxville McGhee Tyson Airport, TN 44 53 29 42 28 / 10 70 40 0 10 Oak Ridge, TN 43 51 29 42 27 / 20 70 30 0 10 Tri Cities Airport, TN 42 55 27 38 23 / 10 80 70 0 0.
813 PM PST Tue Feb 25 2020 Mostly clear and warm weather is expected this week under building high pressure and offshore flow.
Dry and cold again tonight, but clouds from a weak trough to our north will limit radiational cooling after midnight. The clouds will decrease later Wednesday, and Wednesday afternoon will end up warmer than today as the main upper ridge in the Pacific shifts inland.
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.
Cold front has moved through the coastal waters late this evening. Cold front has moved into the near shore waters at this time with latest MSAS analysis showing strong pressure rises of 4-5 millibars per 3 hours from the Coastal Bend norhtwest into the Brush Country to near Eagle Pass. Made adjustments to cloud cover as mid level clouds have expanded over the coastal plains associated with lift on the southern edge of the short wave trough passing by to the north and an upper level jet streak moving across south Texas. Cold front has arrived on time for onset of SCA conditions over the coastal waters around 03Z.
some wrap around precipitation is possible for north GA in the form of a mix of rain and snow as temperatures drop near or below freezing.
Continue to expect a gradual decreasing trend by Wednesday morning with the parent upper trough axis now east of the area and pulling away. High pressure moves into the area tonight and winds will become light and variable, allowing temperatures to range from five above to five below zero.
258 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.
Meanwhile, a deepening mid and upper level trough will translate eastward into the entire eastern United States, and equatorward into the southern Gulf of Mexico by late today. Because of this robust and progressive cyclonic trough, a cold front will move into the southeast Gulf of Mexico this evening, before passing through the Florida Keys shortly after midnight. Beyond that, although the main and significant mid and upper level ascent will remain north of our region, low level confluence associated with cold front and subtle lift aloft should generate a swath of showers and perhaps a thunderstorm until around midnight, before tapering off to isolated showers after midnight.
1120 PM CST Tue Feb 25 2020 An upper level low pressure system was located over south central Kansas. Temperatures over extreme southeast Kansas into western MO were in the low 40s, with mid to upper 30s across the remainder of the CWA. 2) Cooler temperatures through the end of the week.
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.
Precip continuing to push southward across Northeast Oklahoma and Northwest Arkansas this evening as an upper level low pressure system continued to move southeast across Kansas. rain becoming rain mixing with snow then transitioning to all light snow will continue to shift southward across the CWA overnight as the upper low moves across the region. Within the higher terrain locations localize amounts in the half to near one inch could be possible.
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.
347 AM EST Wed Feb 26 2020 A deep mid/upper level trough will move in later today, and a piece of short wave energy will move through the trough tonight. The transition to snow will happen during the day across some of the higher elevations, but valley areas should stay rain until tonight. The period begins rather cold with a long wave trough covering much of the U.
334 AM EST Wed Feb 26 2020 Rain showers are expected today with a crossing cold front. Areas of fog and drizzle should continue early this morning with saturation in the low levels.
Light showers associated with today's earlier cold front are also diminishing with just a few stray flurries expected in the far northeastern plains.
Sharp upper trough currently incoming, and is set to pass on Wed. A cold front is slowly working itself across Middle Tennessee this evening, with very few echoes showing up on radar, and very few expected until after 12Z. Tomorrow, a strong upper trough will sweep across the mid state, bringing additional low-level moisture and mainly light showers to the mid state.
Latest models have also trended south and east with the higher snow amounts, leaving just a small portion of the southeastern most CWA with any potential for close to an inch of snow. Have trended lower on QPF for most of the forecast area and confined the higher amounts to the south and east.
354 AM EST Wed Feb 26 2020 A cold front will be in the area today. Behind the cold front, drier and cooler air will dominate across the area through the weekend. Short wave energy crossing the eastern Midlands in southwest flow aloft was producing showers across the Lower Savannah River Area and the eastern Midlands this morning. 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.
1029 PM MST Tue Feb 25 2020 Broad trough covers the CONUS, with the upper low over western KS. As the trough shifts east, an upper ridge will build over the western CONUS, bringing drier and slightly warmer conditions for Wednesday. Kept highs for Wednesday towards the lower end of guidance, taking into account fresh snowfall and increasing clouds.
1249 AM EST Wed Feb 26 2020 Rain showers will prevail before transition to snow with crossing low pressure Wednesday night. In addition, phasing with a trough farther north will lower the heights even more and prompt a transition to snow with cold advection. 8) is possible just West of the higher elevations. Generally we expect an inch or less of snow for much of the area, with a couple of inches possible N of I 80 and slightly more in the higher terrain of Preston, Tucker and Garrett counties. As the low pressure propagates NE it will be oriented such that banded snow showers off of the lakes will be possible.
237 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.
206 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.
158 AM MST Wed Feb 26 2020 A warm front will move through eastern Montana today with some clouds and a wind shift to the WNW this afternoon.
1118 PM EST Tue Feb 25 2020 Rain showers will prevail before transition to snow with crossing low pressure Wednesday night. In addition, phasing with a trough farther north will lower the heights even more and prompt a transition to snow with cold advection. 8) is possible just West of the higher elevations. Generally we expect an inch or less of snow for much of the area, with a couple of inches possible N of I 80 and slightly more in the higher terrain of Preston, Tucker and Garrett counties. As the low pressure propagates NE it will be oriented such that banded snow showers off of the lakes will be possible.
617 AM EST Wed Feb 26 2020 Rain showers are expected today with a crossing cold front. Areas of fog and drizzle should continue early this morning with saturation in the low levels. The snow showers should become scattered on Thursday for most areas as the areas remains under the upper trough. Upslope flow in WNW wind should enhance snowfall accumulation in the higher elevations E-SE of PIT, where a Winter Weather Advisory has been issued. Expecting 2-6 inches of snow in these locations, with the highest amounts on the higher terrain in WV and MD.
Light rain and drizzle across the area so far tonight as the upper trough inches its way eastward towards the mid state. Chances for rain should increase this morning as the trough axis approaches, and most of the rain chances for the afternoon should be confined to the I-65 corridor and eastward. Temps will cool during the afternoon as the front is moving through the region, and cooler temps aloft will be following behind. Thursday looks to be dry as the upper trough moves through and brings northwest flow aloft in its wake.
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.
405 AM CST Wed Feb 26 2020 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.
Surface ridging builds eastward from the High Plains through the day, resulting in the pressure gradient relaxing and winds decreasing by this evening. Given the 03-06Z passage time of the ridge, am expecting that surface winds will remain decoupled until sunrise and leaned on the lower side of the guidance envelope for lows. Forecast soundings show the lower troposphere struggling to saturate as the wave passes through, though most locales do see some collapse of the low-level dry wedge before the wave completely clears.
558 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.
and Thursday An upper trough over Illinois will move northeast to Western New York by Thursday morning, while another upper trough moves slowly across Northern Wisconsin and Upper Michigan.
The winds from earlier will relax quickly after sunset, this coupled with the clearing skies and continued cold air advection will result in low temperatures dipping below freezing area-wide with much of the area getting into the upper 20s. Temperatures will warm into the low to mid 50s due to the return of sunshine under clear skies.
some wrap around precipitation is possible for north GA in the form of a mix of rain and snow as temperatures drop near or below freezing. Only minor accumulations are expected and mainly across the higher elevations.
A deep mid/upper level trough will move in later today, and a piece of short wave energy will move through the trough tonight. The transition to snow will happen during the day across some of the higher elevations, but valley areas should stay rain until tonight. The period begins rather cold with a long wave trough covering much of the U. There could be a few snow showers fading away in the higher terrain across Southwest Virginia and Northeast Tennessee on Thursday morning.
The warming trend intensifies Thursday with highs 10 to as much as 20 degrees warmer than today.
The upper low continues a slow trudge east across Kansas with wrap-around moisture still pinwheeling down onto the CWA. High pressure and dry conditions will ensue for the Wed/Wed night timeframe with near to above normal temps. Upper ridge will dominate over the weekend with much above normal temperatures and dry conditions.
Outside of an inch or two of snow over the Central Mountains (primarily during tonight's time-frame), expect that southern Colorado will experience dry conditions, decreased winds, especially when compared to yesterday's relatively impressive winds and moderating temperatures(although temperatures are projected to remain below late February climatological averages over most locations), as closed upper low rapidly shifts from eastern Missouri early this morning into western New York by sunrise Thursday. Nice warm-up expected from Thu into Sun, as upper level ridge moves eastward through the Rockies and mild wly flow develops across CO. upper trough then deepens during the day Sun, with snow showers returning to the mountains along the Continental Divide by afternoon.
An upper ridge will shift over the region tonight and Thursday.
Otherwise, still a cooler day today with highs in the mid 30s. Highs Thursday a little warmer, mostly in the lower to mid 40s.
/issued 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.
Overnight temperatures had fallen a few degrees below freezing over most areas. Additional snowfall amounts are expected to range from 2 to 5 inches with the higher amounts in the vicinity of the heavier bands.
316 AM PST Wed Feb 26 2020 High pressure remains in control this week over western Nevada and the Sierra with dry conditions, light winds, and above average high temperatures. Low pressure will impact the region this weekend with gusty southwest winds and chances for rain and snow. Strong ridging will keep high temperatures above seasonal averages while strong radiational cooling brings overnight lows back to around seasonal averages. Western Nevada temperatures are expected to be in the mid/upper 60s and around 60 degrees for Sierra valleys; lows will be in the low 30s for Nevada and mid/upper 20s for Sierra valleys.
532 AM EST Wed Feb 26 2020 Rain showers are expected today with a crossing cold front. Areas of fog and drizzle should continue early this morning with saturation in the low levels. The snow showers should become scattered on Thursday for most areas as the areas remains under the upper trough. Upslope flow in WNW wind should enhance snowfall accumulation in the higher elevations E-SE of PIT, where a Winter Weather Advisory has been issued. Expecting 2-6 inches of snow in these locations, with the highest amounts on the higher terrain in WV and MD.