Aikyam-Lab/Synoptic-Bench huggingface dataset:
234 AM MST Mon Dec 28 2020 Low stratus has moved into much of southeastern Montana with some of the low clouds settling onto the ground as fog. The trof will track further south of our area than what we saw 24 hours ago which will keep most of the moisture out of our area. As high pressure builds over Yellowstone National Park, the pressure gradient will tighten and winds will increase overnight on Tuesday where winds will gust to 45 mph. High temperatures will stay in the 30s with a few locations warming into the low 40s today and Tuesday. Outside of some periods of snow over the mountains, the lower elevations look to remain mostly dry through the extended.
554 AM CST Mon Dec 28 2020 (Today and tonight) A warm front just south of Junction. Low clouds will spread north with the warm front. Temperatures tonight will be steady or slowing rising behind the warm front, along with increasing winds. There is a chance of rain, particularly over the Big Country tonight as an upper trough approaches from the west.
The same satellite imagery is showing a hole in the clouds / fog over the Little Rockies, so being up in the higher elevations around Zortman should give anyone there a photogenic look down at the surrounding fog. Next detail in the short term is the front / trough moving through tonight and Tuesday.
A weak and decaying coastal trough continues to produce some shower activity over the Atlantic waters and east coast metro areas early this morning. A large area of high pressure will dominate the weather pattern across South Florida for tonight into Tuesday bringing mainly dry conditions to the region.
343 AM CST Mon Dec 28 2020 Much cooler weather will be the main story for today behind the cold front which passed through last night. With weakening low-level flow today, this stratus may get "trapped" beneath the incoming anticyclone. Gosselin Tuesday will kick off a string of active days as a deep trough begins to push eastward across the central CONUS. As the cyclone deepens, southerly flow across the mid-Mississippi Valley will intensify. This will result in strong warm air advection and moisture convergence along the warm front which is forecast to push through northern Missouri into central Illinois on Tuesday afternoon/evening.
353 PM EST Mon Dec 28 2020 A dry cold front late tonight will bring cooling through mid week.
A low pressure system will track into the Desert Southwest through tomorrow morning before exiting the area, bringing precipitation to the southern two-thirds of Utah.
On Wed, a low pressure system over nrn Mexico will begin to push to the north and east.
Tomorrow winds will increase across the forecast area as the pressure gradient get tighter due to a low pressure system to the northwest.
Reimer Low stratus has moved into much of southeastern Montana with some of the low clouds settling onto the ground as fog. The trof will track further south of our area than what we saw 24 hours ago which will keep most of the moisture out of our area. As high pressure builds over Yellowstone National Park, the pressure gradient will tighten and winds will increase overnight on Tuesday where winds will gust to 45 mph. High temperatures will stay in the 30s with a few locations warming into the low 40s today and Tuesday. Outside of some periods of snow over the mountains, the lower elevations look to remain mostly dry through the extended.
131 PM CST Mon Dec 28 2020 Although last night's light rain moved out of Middle Tennessee several hours ago, a cold front continues to inch its way across the mid state this afternoon. Clouds are gradually scattering out and temperatures remain sluggish as colder air pushes in behind the retreating warmer air.
Temperatures will decrease oe remain steady the remainder of the course of the day in the wake of a crossing cold front. Overall, and accumulation will be light with an inch at best with a dusting at most locations and up to between an inch or two locally north of I-80 where the BL supports slightly better ratios and in the ridges with orographic enhancement. Light snow showers will linger Tuesday morning along and north of I-80 under cold northwesterly flow aloft but end by the afternoon with increasing subsidence and high pressure assumes control.
257 PM EST Mon Dec 28 2020 High pressure will continue to moderate conditions through mid- week.
Mostly clear skies expected along with warmer temperatures and highs in the mid to upper 60s. High pressure and a dry airmass will prevail through tonight. Skies are expected to be mostly clear with afternoon highs ranging from the lower 60s across the north to near 70 at Cross City.
High pressure centered over the upper midwest late today will drift east to the OH Valley by mid day Tue.
Meanwhile, a vigorous upper level trough will begin to push onshore across California. Given the low level warm advection and warming temperatures expecting little to no impacts from any wintry mix late tonight and Tuesday morning. Overnight lows will range from the mid 20s over the eastern Ozarks to the low to mid 30s across the western counties.
1036 AM MST Mon Dec 28 2020 Current upper level analysis has broad trof across the northern CONUS, weak ridging across the Rockies, and a deeper trof and cut off low along the West Coast. At the surface, high pressure is located across eastern SD and Nebraska, with a weak lee trof across central Montana and Wyoming. Large precipitation shield develops north of the low and moves into southern and western portions of the area early this evening.
(This evening through Tuesday) Moisture continues to increase in mid and upper levels with the approach of an upper wave trough that is ahead of the closed low off the U. Lift from the approaching trough will likely generate rain showers over parts of the southwestern quarter of Oklahoma later this evening. Temperatures in the northwestern corner of the state are expected to be at or just below freezing. A winter weather advisory for freezing rain will be issued for that. The cold front is expected to arrive after 00Z.
The cold front that brought the early morning light rain and clouds is pushing through the area.
A series of troughs moving through from the northwest will break down the ridge that has been over the region since before Christmas. Late this weekend, a deep, cold trough will develop off the west coast, so even straight westerly or slightly southwesterly flow will bring cold air.
235 PM EST Mon Dec 28 2020 Snow showers and flurries across the north will end this afternoon, otherwise dry weather is expected through Tuesday with highs around freezing.
With high pressure building, stratus continues to erode and is expected to make way for partly cloudy to mostly sunny skies this afternoon. At the surface, a back door cold front continues to push south southwest across the state. By early afternoon, clouds should start to break up and diminish as upper level ridging builds in.
With temperatures and wet-bulb temperatures all above freezing, the HWO was also re-issued as frozen precipitation is not expected outside of light sprinkles/flurries in the mountains tonight. Was most confident in the low ceilings at KTRI so I did add that in, but whether fog or low clouds win out at KTYS and KCHA I am less certain of. CD Chattanooga Airport, TN 54 35 53 39 54 / 20 0 0 0 0 Knoxville McGhee Tyson Airport, TN 48 32 48 33 54 / 20 10 0 0 0 Oak Ridge, TN 49 30 48 34 52 / 20 0 0 0 0 Tri Cities Airport, TN 44 30 46 29 52 / 20 10 0 0 0.
A well-develop trough aloft, over the Four Corners region, has produced flow, from the southwest aloft, over Texas. Meanwhile, surface winds, from the southeast, will push a warm front back toward the north tomorrow. After an unusually warm day Tuesday, another cold front will push across West Central Texas Tuesday night.
The upper level ridge that brought our recent warm weather has shifted eastward as a closed upper low moves southward along the California coast.
May eventually need to add the far north, but that area has the lowest totals now, and there has been a gradually trend toward less snow in the guidance. for 18Z TAF Issuance A weak cold front will move across the region this afternoon into early this evening.
With temperatures and wet-bulb temperatures all above freezing, the HWO was also re-issued as frozen precipitation is not expected outside of light sprinkles/flurries in the mountains tonight. BW Chattanooga Airport, TN 35 53 39 54 48 / 0 0 0 0 30 Knoxville McGhee Tyson Airport, TN 32 48 33 54 44 / 10 0 0 0 20 Oak Ridge, TN 30 48 34 52 44 / 0 0 0 0 30 Tri Cities Airport, TN 30 46 29 52 40 / 10 0 0 0 20.
With high pressure building, stratus continues to erode and is expected to make way for partly cloudy to mostly sunny skies this afternoon. At the surface, a back door cold front continues to push south southwest across the state. By early afternoon, clouds should start to break up and diminish as upper level ridging builds in. Trend towards VFR continues this evening before increased cloud cover is expected starting early Tuesday morning as a low pressure system arrives.
From synopsis: A strong area of high pressure will move east across the Ohio Valley towards the east coast of the country on Tuesday, with its southern periphery building into the Florida Keys.
Temperatures will decrease or remain steady the remainder of the course of the day in the wake of a crossing cold front. Overall, any accumulation will be light, with a dusting at most locations and up to between an inch or two locally north of I-80 where the BL supports slightly better ratios and in the ridges with orographic enhancement. Light snow showers will linger Tuesday morning along and north of I- 80 amid cold northwesterly flow aloft but end by the afternoon with increasing subsidence as high pressure assumes control.
in advance of the weak cold front pushing through the area. The cold front will sag southward off the coast tonight. Overnight lows will trend around 5 degree above climatological norms ranging from the low to mid 40s over most inland areas to mid 40s to near 50 near and along the coast. Tuesday's high temperatures will trend 10 degrees warmer than normal ranging from the mid 60s to near 70. A weak cold frontal boundary over northern AL and MS will sag southward today bringing with it a lower cloud deck. The lowest clouds associated with this cloud deck will remain primarily north of the forecast area but some patchy mvfr ceilings are possible north of highway 84 and west of interstate 65: otherwise, cloud bases should remain above 3500 feet.
Between those bands of precipitation, we may also see low visibility along with some freezing drizzle especially in the higher elevations near the Cheyenne Ridge where upslope flow will play a role.
Surface analysis this afternoon places a cold front from the Tennessee Plateau to Central Mississippi, Northern Louisiana and into Central Texas. A rain free night is expected across the Mid-South as the cold front will remain to the south of the area and become quasi- stationary.
Currently, the forecast area is under a low amplitude mid level ridge that is being suppressed with a broad trough over the Great Lakes region. A deep western trough works eastward which will provide for a very active Tuesday weather wise. Cooler overnight lows with a slight northeast breeze appears to start the morning Tuesday off a bit cooler overall. The end result is that the expectation will be that light snow beginning before sunrise will begin to gradually transition to a wintry mix including freezing rain. With a slower warm nose, melting precip in the warm layer will likely provide for a longer duration of freezing rainfall. The GFS continues to be more aggressive with warmer air overall.
546 PM CST Mon Dec 28 2020 (This evening through Tuesday) Moisture continues to increase in mid and upper levels with the approach of an upper wave trough that is ahead of the closed low off the U. Lift from the approaching trough will likely generate rain showers over parts of the southwestern quarter of Oklahoma later this evening. Temperatures in the northwestern corner of the state are expected to be at or just below freezing. A winter weather advisory for freezing rain will be issued for that. The cold front is expected to arrive after 00Z.
A disturbance may bring some flurries to the area tonight into Tuesday morning, along with cooler than normal temperatures.
The upper level trough will have great ascent in the left front quadrant at 300 mb allowing for a rain/snow mix across the Permian Basin. 850 mb temps support snow accumulations throughout the region post cold frontal passage.
229 PM MST Mon Dec 28 2020 Fog has mostly dissipated, but some higher hills are still seeing some reduced visibility as the terrain runs into the lower stratus. Still expecting a slight chance for some snow in the southeast Carter County overnight as the low over the Four Corners ejects out into the plains. Outside of some periods of snow over the mountains, the lower elevations look to remain mostly dry through the extended.
627 PM EST Mon Dec 28 2020 Dry weather is expected through Tuesday with highs around freezing.
419 PM CST Mon Dec 28 2020 Currently, the forecast area is under a low amplitude mid level ridge that is being suppressed with a broad trough over the Great Lakes region. A deep western trough works eastward which will provide for a very active Tuesday weather wise. Cooler overnight lows with a slight northeast breeze appears to start the morning Tuesday off a bit cooler overall. The end result is that the expectation will be that light snow beginning before sunrise will begin to gradually transition to a wintry mix including freezing rain. With a slower warm nose, melting precip in the warm layer will likely provide for a longer duration of freezing rainfall. The GFS continues to be more aggressive with warmer air overall.
837 PM EST Mon Dec 28 2020 High pressure ridge across south Georgia with clear skies and calm winds across the area. Temperatures will drop into the low/mid 40s inland and upper 40s/lower 50s near the coast. Areas of dense fog expected again after midnight with fog lifting early Tuesday morning as a dry cold front arrives and increases winds.
639 PM MST Mon Dec 28 2020 Steady freezing drizzle was reported at the Cheyenne airport and weather office over the last hour with a thin coating of ice observed. Added occasional freezing drizzle to the forecast through midnight tonight. Between those bands of precipitation, we may also see low visibility along with some freezing drizzle especially in the higher elevations near the Cheyenne Ridge where upslope flow will play a role.
High pressure is centered northeast of the area. Upper level analysis shows a trough over the southwest US, with low pressure centered over southern NV. Snow will gradually spread from southwest to northeast across the area tonight, especially from southwest to central SD, as energy in southwest flow ahead of the trough arrives. Snow will gradually taper off Tuesday from west to east as the trough moves into the Plains.
Expect ceilings to lower, especially during the day Tuesday as the front lifts northward from Texas/Louisiana as a warm front, with isolated showers possible by mid day.
A weak cold front was to the north of the area but is expected to weaken and washout tonight.
Reinforcing high pressure over the Upper Midwest will move towards the Atlc coast over the next 24 hours. Overnight lows generally in the 50s with normally cooler areas northwest of I-4 potentially realizing U40s, and L60s possible across barrier islands and immediate St. Reinforcing high pressure moves toward the Atlc Seaboard later on Tue, though the pressure gradient will be tightening.
Although last night's light rain moved out of Middle Tennessee several hours ago, a cold front continues to inch its way across the mid state this afternoon. Clouds are gradually scattering out and temperatures remain sluggish as colder air pushes in behind the retreating warmer air.
310 PM CST Mon Dec 28 2020 Ridging continues to build into the region and satellite imagery indicates cloud cover eroding as a result. An upper level trough will propagate across the CONUS.
Strong winds will decrease this evening across eastern Arizona as a cold front pushes across northern Arizona.
529 PM CST Mon Dec 28 2020 Ridging continues to build into the region and satellite imagery indicates cloud cover eroding as a result. An upper level trough will propagate across the CONUS.
Also dropped overnight temperatures into the low to mid teens. Fog has mostly dissipated, but some higher hills are still seeing some reduced visibility as the terrain runs into the lower stratus. Still expecting a slight chance for some snow in the southeast Carter County overnight as the low over the Four Corners ejects out into the plains. Outside of some periods of snow over the mountains, the lower elevations look to remain mostly dry through the extended.
A cold front currently bisects the Permian Basin and will continue to slowly move north. The upper level trough will have great ascent in the left front quadrant at 300 mb allowing for a rain/snow mix across the Permian Basin. 850 mb temps support snow accumulations throughout the region post cold frontal passage.
A cold and wet low pressure system will move east of the area later this evening with precipitation coming to an end.
/issued 257 PM EST Mon Dec 28 2020/ High pressure will continue to moderate conditions through mid- week.
Meanwhile, low pressure tracking well south of the region during this time will mostly miss the CWA. As low pressure pushes even further downstream of the region, colder temperatures will pull south, but still remaining within seasonable tolerances.
Other than a few high clouds streaming across the mid-state, winds are out of the north and it'll be noticeably cooler tonight than last.
625 PM EST Mon Dec 28 2020 A dry cold front passing through late tonight will bring cooling through mid week.
1156 PM EST Mon Dec 28 2020 Dry weather is expected through Tuesday with highs around freezing.
A low pressure system will east-northeast across the eastern Great Basin tonight before weakening as it moves into the plains states Tuesday.
1034 PM CST Mon Dec 28 2020 (This evening through Tuesday) Moisture continues to increase in mid and upper levels with the approach of an upper wave trough that is ahead of the closed low off the U. Lift from the approaching trough will likely generate rain showers over parts of the southwestern quarter of Oklahoma later this evening. Temperatures in the northwestern corner of the state are expected to be at or just below freezing. A winter weather advisory for freezing rain will be issued for that. The cold front is expected to arrive after 00Z.
A long wave ridge is developing over the Central US, while dry and stable air continues to cover the Caribbean and the Gulf of Mexico. The 00Z KKEY RAOB sampled rising heights at all the significant levels, revealing the southern periphery of the building ridge is sliding east across the Gulf of Mexico. Two high pressure systems are merging this evening, one centered just to the west of the Ohio River Valley, and the other the relic subtropical ridge centered just to the west of Bermuda. The forecast calls for slight rain chances overnight as the boisterous BL breezes slowly hack away at the low-level subsidence. From synopsis, a strong area of high pressure will move east across the Ohio Valley towards the Eastern Seaboard on Tuesday, with its southern periphery building into the Florida Keys.
159 AM MST Tue Dec 29 2020 High pressure will bring mostly clear skies to most locations through this afternoon.
Latest surface analysis had a >1032mb high centered over the mid Mississippi valley and a stalled cold front along our Highway 84 corridor. On Wed, a low pressure system over nrn Mexico will begin to push to the north and east.
935 PM CST Mon Dec 28 2020 Forecast concerns tonight center around rain chances mainly after 06z, as well as any potential for freezing rain near the OK/KS border, which fortunately appears very minimal. Temperatures across parts of Osage County did dip below freezing earlier, but have since trended up with all locations above freezing at this time. While lower dew points across northeast OK yield sfc wet bulb temps near freezing, the overall trend through tonight should be a modest rise in these values and as such, any precip will remain liquid.
Temperatures in far northwest Oklahoma are currently at or just below freezing with wetbulb temperatures right around 30 degrees. Southeasterly surface flow should bring wetbulb temperatures above freezing in northwest Oklahoma between sunrise and mid morning, allowing precipitation to transition back to rain. A cold front will enter northwest Oklahoma late tonight as the upper level low approaches.
High pressure is building into the region but it is slow going. CD Chattanooga Airport, TN 52 40 56 44 62 / 0 0 0 30 70 Knoxville McGhee Tyson Airport, TN 47 33 55 43 60 / 0 0 0 20 60 Oak Ridge, TN 47 35 56 45 58 / 0 0 0 30 60 Tri Cities Airport, TN 44 29 52 38 60 / 0 0 0 20 60.
A deep longwave trough from the Northern Plains to Southern California will drop south and east into Texas and Mexico by mid week. A reinforcing shot of cold air a little further west than yesterdays model runs will cause the trough over Texas to lift Northeast also a little west of yesterdays models creating a surface occlusion over Northeast Texas and Southern Oklahoma.
A low pressure system will move east-northeast across the eastern Great Basin tonight before weakening as it moves into the plains states Tuesday.
1004 PM MST Mon Dec 28 2020 Steady freezing drizzle was reported at the Cheyenne airport and weather office over the last hour with a thin coating of ice observed. Added occasional freezing drizzle to the forecast through midnight tonight. Between those bands of precipitation, we may also see low visibility along with some freezing drizzle especially in the higher elevations near the Cheyenne Ridge where upslope flow will play a role.
335 AM EST Tue Dec 29 2020 Dry weather is expected through Tuesday with highs around freezing.
The bulk of the activity will remain to the north of PIT, with some late night enhancement expected over the ridges as the cold air drives southward. Models are picking up on this dry airmass, indicating that as dawn approaches, snow shower activity should be confined to the ridges and far NE corner of the forecast area. Lingering morning snow showers will erode quickly as high pressure builds, and the colder air retreats northward. The bulk of the cloud deck will be positioned over PA and ridges of northern WV, while increasing morning sunshine will be the rule over OH and the low lands of WV. Precipitation associated with this trough will arrive Wed evening, with latest model runs trending a bit warmer, keeping all the precipitation liquid. Any lingering snow should be short-lived owing to the influence of building broad high pressure.
Expect rain and snow showers to become much more spotty overnight and into Tuesday, as the cold front weakens and moves into eastern Arizona.
A cold front currently bisects the Permian Basin and will continue to slowly move north through the night. A cold front currently bisects the Permian Basin and will continue to slowly move north. The upper level trough will have great ascent in the left front quadrant at 300 mb allowing for a rain/snow mix across the Permian Basin. 850 mb temps support snow accumulations throughout the region post cold frontal passage.
Lingering morning snow showers over the ridges will erode quickly as high pressure builds, and the colder air retreats northward. The bulk of the cloud deck will be positioned over the northern half of the forecast area and ridges of northern WV. Precipitation associated with this trough will arrive Wed evening, with latest model runs trending a bit warmer, keeping all the precipitation liquid. Any lingering snow should be short-lived owing to the influence of building broad high pressure.
Only made minor tweeks to expand the low clouds near the Nv/ID border region.