Aikyam-Lab/Synoptic-Bench huggingface dataset:
/issued 400 AM CST Tue Dec 1 2020/ SHORT TERM (Now through Wednesday): Good radiational cooling overnight has allowed temperatures across portions of the northern ranchlands to drop to around freezing early this morning. Highs today should reach the upper 60s to the lower 70 under mostly sunny skies. The next cold front arrives on Wednesday. Wednesday will be warmer with highs in low to mid 70s early, with temperatures falling into the 60s by late afternoon.
317 AM CST Tue Dec 1 2020 Sunshine and dry weather will be the rule today, as the Low pressure system that brought about snow flurries and cloud coverage shifts into the northeast US.
Snows are tapering off this hour, as the core of a broad upper level low pressure system shifts east of our region. As a result, highs on the day will reach into the mid to upper 40s, which is still several degrees cooler than seasonal norms.
530 AM CST Tue Dec 1 2020 Three cold fronts move through wrn and ncntl Nebraska today through Wednesday. A Pacific cold front arrives this morning and the wind forecast leans on the the short term model blend plus 2 kts to bring speeds up to the 500m AGL model consensus suggesting speeds of 20 to 25 mph. The temperature forecast today uses the warmer RAP model for highs in the 40s. Less than an inch accumulation is in place with the best chance for accumulation south of Interstate 80 where an inverted h700mb trof could be operating. This is slightly cooler than the guidance blend during the day but warmer at night.
359 AM CST Tue Dec 1 2020 An amplified ridge remains over the Midwest today, keeping the forecast quiet for the next 24 hours. During the evening, high cloud cover increases as a deep upper-level trough drops southward over the Rockies and High Plains.
526 AM CST Tue Dec 1 2020 Sunshine and dry weather will be the rule today, as the Low pressure system that brought about snow flurries and cloud coverage shifts into the northeast US.
542 AM CST Tue Dec 1 2020 An amplified ridge remains over the Midwest today, keeping the forecast quiet for the next 24 hours. During the evening, high cloud cover increases as a deep upper-level trough drops southward over the Rockies and High Plains.
Weak high pressure is then expected to bring quiet weather to the area tonight and Wednesday, with somewhat lighter northwest to west winds.
Aside from some light returns near the Cumberland Plateau, snow has ended across the Tennessee Valley as cooler, drier air continues to filter in. All of this due to a closed upper low that continues to slowly shift east toward the Atlantic Coast. High pressure will build in over the south and central portions of AL, keeping subsidence in place throughout the day. Will maintain sunny skies and lighter westerly flow throughout the afternoon hours, with high temperatures topping out in the lower 40s. With high pressure and subsidence still in place overnight, clear skies and light winds will set the stage for good radiational cooling, dropping lows near 20 degrees to perhaps the teens in some locations.
345 AM CST Tue Dec 1 2020 Aside from some light returns near the Cumberland Plateau, snow has ended across the Tennessee Valley as cooler, drier air continues to filter in. All of this due to a closed upper low that continues to slowly shift east toward the Atlantic Coast. High pressure will build in over the south and central portions of AL, keeping subsidence in place throughout the day. Will maintain sunny skies and lighter westerly flow throughout the afternoon hours, with high temperatures topping out in the lower 40s. With high pressure and subsidence still in place overnight, clear skies and light winds will set the stage for good radiational cooling, dropping lows near 20 degrees to perhaps the teens in some locations.
Otherwise, temperatures will gradually warm above freezing. Temperatures are generally near or above freezing, as are pavement temperatures. Snow should melt quickly this afternoon given the above freezing temperatures and perhaps peeks of sunshine. Air and pavement temperatures are generally near or above freezing with minimal impacts noted. High pressure building in will give way to clearing skies/VFR conditions this evening, with W-NW winds continuing to gust to 20-25kts.
As the initial disturbance sinks south and a cold front traverses the area late this afternoon through the evening hours. expect a broad trough to set up over the plains. with a reinforcing upper level low expected to sink south on Wednesday. Winds will gradually become northwesterly today as an area of low pressure transits through the region.
307 AM CST Tue Dec 1 2020 A sharp short wave trough will move across the Rockies today influencing our weather for today and tonight. A cold front will then push through late this afternoon into early evening. Breezy winds out of the north will accompany this cold front. The cold front will be south of the FA by tomorrow morning.
715 AM EST Tue Dec 1 2020 A lingering low pressure system will keep snow showers in the region today through early Wednesday morning. Drier weather returns Wednesday afternoon under building high pressure. Increased PoP through Wednesday morning to more align with model consensus, as snow showers will be slower to erode west to east than previously depicted given strong upper dynamics persisting in the backside of the low. Widespread snow is expected for much of the day as moisture wraps around an upper low that slowly track into southeastern Canada this evening. Drier air will begin infiltrating the region tonight as the upper low further pulls to the northeast.
349 AM CST Tue Dec 1 2020 Three cold fronts move through wrn and ncntl Nebraska today through Wednesday. A Pacific cold front arrives this morning and the wind forecast leans on the the short term model blend plus 2 kts to bring speeds up to the 500m AGL model consensus suggesting speeds of 20 to 25 mph. The temperature forecast today uses the warmer RAP model for highs in the 40s. Less than an inch accumulation is in place with the best chance for accumulation south of Interstate 80 where an inverted h700mb trof could be operating. This is slightly cooler than the guidance blend during the day but warmer at night.
512 AM EST Tue Dec 1 2020 A lingering low pressure system will keep snow showers in the region today through early Wednesday morning. Drier weather returns Wednesday afternoon under building high pressure. With cold, moist air advancing into the Ohio River Valley from a lingering low pressure system centered in western NY, widespread snow showers are occurring across the region. Expect an additional 1-2 inches just before dawn across the region; 2-4 inches in the ridges. As the upper-level trough remains nearly stationary over Lake Ontario, steady snow showers will prevail throughout the day. Snow showers will continue, mainly north of Pittsburgh and in the ridges, late tonight through early Wednesday afternoon due to lake enhancement/upsloping. For areas in eastern Ohio and northern West Virgina, precip will likely wrap up early Wednesday morning as high pressure builds to our southwest.
Cold temperatures are in store for this morning clear skies and high pressure overhead allow lows to dip into the teens over central and south central Missouri while the remainder of the area bottoms out in the low to mid 20s. Some small-scale upper-level ridging moves overhead today, with surface winds shifting to southerly. Given above freezing surface temperatures and model thermal profiles during the daylight/early evening hours, we expect precipitation to remain as all rain during this time frame.
Gusts may diminish for a few hours around sunset before returning as a cold front moves through late tonight. /issued 342 AM CST Tue Dec 1 2020/ Another cold start to the day with temperatures near freezing across the area as a result from radiational cooling. This afternoon surface SW flow will transport warmer air into the area helping bring high temps into the 60s area wide and upper 70s for the Rio Grande making it the warmest day of the week. By late afternoon an upper level trough will dig into the TX panhandle pushing a cold front through the area late tonight and early tomorrow morning ushering in cold NE flow.
Mid/upper trof will dig southward thru the Rockies and into West Texas today and tonight. Corresponding prefrontal trof and cold front will advance e/se into the region during the day. Prefrontal trof and cold front will make its way off the Matagorda coast during the late afternoon and the Galveston coastline toward sunset.
Satellite trends show some dryer air working its way eastwards in the higher atmosphere, this is indicative of the upper level ridge beginning to build into the region. Temperatures will be a bit tricky later this week: Where low clouds form, this could result in low temperatures being milder and high temperatures cooler. A few of the high valley locations that have snow cover and do not build any low cloud cover should be able to cool into the single digits to below zero. High pressure will create stagnant air in the valleys and may cause deteriorating air quality by the end of the week.
As the initial disturbance sinks south and a cold front traverses the area late this afternoon through the evening hours. expect a broad trough to set up over the plains. with a reinforcing upper level low expected to sink south on Wednesday. An area of low pressure coming of the Rockies will deepen causing the gradient to tighten out west and consequently it looks like EAR will have higher wind gusts than GRI this afternoon.
600 AM PST Tue Dec 1 2020 Strong high pressure is expected for the remainder of the week and into the weekend bringing a prolonged period of dry, stable, and seasonably cool conditions. Also seeing some stratus near the Columbia River around Grand Coulee and Bridgeport.
1125 AM CST Tue Dec 1 2020 Three cold fronts move through wrn and ncntl Nebraska today through Wednesday. A Pacific cold front arrives this morning and the wind forecast leans on the the short term model blend plus 2 kts to bring speeds up to the 500m AGL model consensus suggesting speeds of 20 to 25 mph. The temperature forecast today uses the warmer RAP model for highs in the 40s. Less than an inch accumulation is in place with the best chance for accumulation south of Interstate 80 where an inverted h700mb trof could be operating. This is slightly cooler than the guidance blend during the day but warmer at night.
1025 AM PST Tue Dec 1 2020 Strong high pressure is expected for the remainder of the week and into the weekend bringing a prolonged period of dry, stable, and seasonably cool conditions. Also seeing some stratus near the Columbia River around Grand Coulee and Bridgeport. Fog is expected to burn off around mid afternoon as it is a fairly thin layer, but is expected to burn off slowly due to strong inversions in place under ridging of high pressure.
Skies are expected to slowly clear out this afternoon as high pressure builds into the region. Weak high pressure is then expected to bring quiet weather to the area tonight and Wednesday, with somewhat lighter northwest to west winds.
High pressure and calm winds should work together to maximize radiational cooling and with snow on the ground over the east, it's likely we'll have many spots see upper teens tonight.
Tonight and Wednesday Fairly quiet conditions are expected for the short term forecast as a weak upper level ridge remain in place across the region. Wednesday will be a bit warmer than today, as low level WAA brings 925mb up a few degrees. Expect highs in the lower to middle 40s. The main weather pattern will mainly be a closed low and trough moving across the Central Plains towards the end of the work week before the next upper ridge arrives over the weekend.
122 PM CST Tue Dec 1 2020 Tranquil weather will continue to prevail across the region with a ridge of high pressure anchored over the area through Wednesday and just some high cirrus at times. Wednesday will be several degrees warmer than today as 925 mb temps climb to 0-3C ahead of a weak boundary with highs climbing into the mid 30s to mid 40s.
A cold front will make its way across the CWA Wednesday morning with winds shifting to the west and northwest ahead and behind it.
Otherwise, high pressure begins to work its way into the area with predominantly clear skies expected the rest of today. Temperatures have finally risen above freezing for areas along and south of the Tennessee River. Northwest flow today keeps us cold with highs this afternoon only topping out in the lower 40s. With high pressure and subsidence still in place overnight, clear skies and light winds will set the stage for good radiational cooling, dropping lows near 20 degrees to perhaps the teens in some locations.
North breezes and slightly lower temperatures will likely hold the second half of the week as the low pressure system circulates around the southwest states. The only notable change to todays forecast was to the high temperatures, which were decreased a few degrees in spots across southern Nevada and northwest Arizona as decent cold air advection was noted over the region, which lined up well with temperature trends through the morning. Cooler air associated with it will be forthcoming for Wednesday in the form of cooler temperatures that are expected to be several degrees below normal. A second, more potent system will move out of Canada into the Northern Plains later today edging the first system eastward and driving a cold front south through Utah and Arizona tonight through Wednesday night.
236 PM CST Tue Dec 1 2020 (Issued 236 PM CST Tue Dec 1 2020) Tonight and Wednesday: Weak high pressure is building into the state this afternoon which is bringing quiet weather to the area tonight and Wednesday.
300 PM EST Tue Dec 1 2020 Cold high pressure will build into central NC through mid-week. Another low pressure may affect the region again by late week. High pressure continuing to building in with mostly clear skies overnight and winds decreasing tremendously ensuring there will be excellent radiational cooling overnight. Temperatures tonight will drop in to the upper 20s for central NC with cooler spots dropping into the mid 20s. With high pressure over head Wednesday will have mostly sunny skies with high temperatures in the low 50s. With the clear skies, light winds, and very dry airmass still in place, overnight lows are expected to fall back down into the upper 20s with some areas in the low 30s.
CD Chattanooga Airport, TN 24 51 28 54 41 / 0 0 0 10 30 Knoxville McGhee Tyson Airport, TN 22 48 26 54 38 / 0 0 0 10 30 Oak Ridge, TN 22 48 26 53 38 / 0 0 0 10 30 Tri Cities Airport, TN 19 44 23 55 34 / 0 0 0 0 30.
Issued by National Weather Service Riverton WY 1050 AM MST Tue Dec 1 2020 Upper level trough with associated cold front continue to push southeast through the state of Wyoming. The heaviest snowfall is expected in the higher elevations of the Snowy and Sierra Madres where up to 6 inches is possible through the afternoon. Behind the deep diving upper level trough that will foster itself over the eastern two-thirds of the CONUS, a 500mb ridge will build in over the Pacific coast and northern Rockies extending towards the Canadian border.
Cooler and drier air has settled over the FL peninsula behind the frontal passage last night. A high pressure system will settle just north of the region, leading to northerly flow around 5-10 mph, with gusts up to 20 mph possible. Much lower dewpoints across the area today will set the stage for overnight lows in the 30s tonight; with lows in the low 30s near Lake George area and mid to upper 30s everywhere else, except in the low to mid 40s in Martin county.
1035 AM EST Tue Dec 1 2020 A lingering low pressure system will keep snow showers in the region today through early Wednesday morning. Drier weather returns Wednesday afternoon under building high pressure. Widespread snow is expected for much of the day as moisture wraps around an upper low that slowly track into southeastern Canada this evening. Drier air will begin infiltrating the region tonight as the upper low further pulls to the northeast.
High pressure will build into the area today. A reinforcing cold front will cross the state midweek. High pressure will settle in again across the region for the remainder of the week. Morning satellite analysis shows a digging trough across the central Rockies. As this low develops and shifts eastward across eastern New Mexico and the Texas Panhandle.
Lows will range from the mid 20s east and north to the low 30s over the southwestern CWA where greater cloud cover is expected. Models continue to trend slightly warmer with less snow for the upcoming event.
This low is expected to increase snow showers along and east of the divide by midnight as it increases instability and concentrates available moisture into favored upslope areas such as Lander to Beaver Rim. Upper-level high pressure over the northwest US will then fold over on Wyoming Wed night into Thu morning, likely strengthening surface inversions in the valleys and basins, keeping some low temperatures in western WY below zero.
1104 AM EST Tue Dec 1 2020 The Florida Keys are solidly in the wake of the recent cold front that passed through last evening. Current observations reveal 15 to 20 mph over land with 20 to 25 knots over the waters with the highest wind speeds occurring at Sand Key Light. Strong winds will persist today as high pressure moves from the Lower Mississippi River Valley northeast into the southern Appalachians through midweek.
A ridge of high pressure will pass east of the region, and winds will turn more west-southwest to southwest during the day. Warmer temperatures will also advect in from the west, though highs (low to mid 40s) will still be below climatological normals.
A ridge of high pressure extending from Ontario to the Gulf Coast will dominate the weather across central Illinois today. The Low pressure system and upper trof are beginning to shift into the ne US, still lingering in the eastern lower Great Lakes area. This, along with the Low/trof movement, will exit lingering clouds out of the ILX coverage area by or slightly after sunrise. High pressure advances into the region overnight, decreasing winds tonight. Moisture tries to advance into the region during this time-frame, however the High pressure exiting the region will really dry out the Midwest. Another weather system will develop across the southern Plains Wednesday, as a deepening trof drops through the Rockies today through mid-week.
By 00z Thu, a closed low will develop over the southern plains and the eastern one will be in southern Quebec. But lets stay optimistic and see how things change as we go through the period! The synoptic pattern in the extended across CONUS highlights two cutoff lows presenting a slightly inverted/tilted Omega pattern that extends the squished ridge northward into the Upper Midwest/Great Lakes region. Upstream from the wester cutoff low, strong and amplified ridging has stationed itself over the west coast. As the ridge inbetween the two cutoff lows weakens and the low over Quebec lifts slowly northward, followed by the one over the southern Plains toward the northeast, the forecast area will continue to live under persistent near-NW flow aloft.
Snow will generally continue overnight as moisture wraps around an upper low tracking into southeastern Canada. During this last push, strong upper jet dynamics, steepening low level lapse rates and enough dendritic growth will promote an additional 1-2" of snow across eastern OH and southwestern PA while northwestern PA and the eastern ridge tops could see another 3-6" of snow. Drier air will begin infiltrating the region tonight as the upper low further pulls to the northeast.
Sustained n winds of 20-25 mph along with gusty conditions are supported by a 90-100nm/4mb MSLP gradient, even down into the Lower Trans Pecos around 09Z/Wed where winds could be sustained 25-30 mph, briefly. Noticeably cooler Wed with highs holding in the 40s in many areas, despite some sunshine. Surface ridging will keep shallow cold air in place Thur PM while the trof aloft holds cold mid-level temps across the area favoring high temps as cold or slightly colder than those on Wed with another hard freeze Fri AM. ECMWF still shows light precip potential Sat into Sun when the upper low shifts into the area, then loiters thru Tue.
A strong ridge remains off the west coast this morning, with dry northwest flow aloft over the Pacific Northwest. Meanwhile The ridge will move slowly east and the axis will break to the east of the forecast area Wednesday and the flow aloft will become southwesterly. This will end the breezy easterly low level flow over the ridges, but the air mass will remain very dry and stable.
256 PM CST Tue Dec 1 2020 Currently, a weak upper-level ridge is moving into the Middle Mississippi Valley, and at the surface, an area of high pressure has kept our weather clear and quiet.
As mentioned, snow will wind down Wednesday night as the upper low moves into OK/southeast Kansas.
Overnight lows again look to range between 25-30 over most areas, with the exception of warmer temperatures above freezing along the barrier islands. Highs on Wednesday should be a little warmer in the mid to upper 50s inland to around 60 or the lower 60s along the immediate coast. Light northwesterly to northerly winds continue through this afternoon, near calm tonight, then light northeasterly to easterly on Wednesday morning as high pressure gradually shifts eastward.
The consolidated upper low then slowly translates east across the Mid Mo Valley or Gulf Coast region late week.
1142 AM CST Tue Dec 1 2020 Cold temperatures are in store for this morning clear skies and high pressure overhead allow lows to dip into the teens over central and south central Missouri while the remainder of the area bottoms out in the low to mid 20s. Some small-scale upper-level ridging moves overhead today, with surface winds shifting to southerly. Given above freezing surface temperatures and model thermal profiles during the daylight/early evening hours, we expect precipitation to remain as all rain during this time frame.
An upper ridge will keep the weather dry for most of the week ahead.
/issued 928 AM CST Tue Dec 1 2020/ Despite a very cold sunrise, we'll transition to a pleasant, albeit slightly cooler than normal, afternoon. Yesterday's upper- level trough continues to move off to the east, leaving a cooler, drier air mass in place across the Mid-South. The surface anticyclone is centered to our south over the Southern MS Valley and winds will back from a more west to southwesterly direction at less than 10 mph. A large upper-level trough will continue east today while high pressure buildings into the Lower Mississippi Valley.
Chattanooga Airport, TN 41 24 51 28 54 / 0 0 0 0 10 Knoxville McGhee Tyson Airport, TN 38 22 48 26 54 / 0 0 0 0 10 Oak Ridge, TN 38 22 48 26 53 / 0 0 0 0 10 Tri Cities Airport, TN 34 19 44 23 55 / 10 0 0 0 0 TN.
With the increased clouds, temperatures were nudged a few degrees cooler for this afternoon. /ISSUED 440 AM MST Tue Dec 1 2020/ Upper level trough remains over the state early this morning and areas of light snow will continue to affect central Montana through the morning. Models continue to indicate that the upper trough will evolve into a cutoff low that dives southward along the eastern slopes of the Rocky Mountains, leaving Montana on the leading edge of an upper level West Coast ridge.
The only items of note in the short term are cooler temperatures for tonight, with outlying areas dropping into the teens, possibly even some lower teens in favorable locations. With a 1021 mb high pressure ridge inching eastward into north central Illinois, along with the dry continental air mass characterized by low precipitable waters (0. As the upper flow stalls Wednesday, due primarily to an upper low closing off over the Southern Plains, the light low-level wind regime will continue.