Aikyam-Lab/Synoptic-Bench huggingface dataset:
309 AM EST Wed Dec 11 2019 Dry high pressure will build into the area from the north today and Thursday.
1020 PM MST Tue Dec 10 2019 Upper ridge will migrate over Colorado the next 24 hrs, then weak wave slides east from the Great Basin into the srn Rockies by late Wed afternoon. Under mainly clear skies overnight and with only a weak and late developing surface lee trough, min temps will fall to fairly cold levels, and many high mountain valleys will drop well below zero once again. Lee slopes of the ern mountains may see downslope winds stir a little toward morning, keeping readings a few degf warmer than locations farther east. Deepening lee trough and better mixing on Wed should boost max temps back into the 50s along and east of the mountains by late afternoon, as winds ramp up and become gusty over the far sern plains.
1015 PM CST Tue Dec 10 2019 Abnormally cold air mass remains in place as upper trough axis passes through. Although a chilly start to the day expected Wednesday morning, moderation begins as height rise and troughs moves east. The highest amounts of 2-3" are focused north of Interstate 94. Freezing rain and drizzle are possible at the tail end of this system, but any accumulations will be really light.
1128 PM EST Tue Dec 10 2019 Snow across the higher elevations of Maryland and West Virginia will taper off tonight behind an exiting cold front. Snow continues to fall across the higher elevations of WV/MD ahead of the mid-level trough. Colder and drier air will arrive on Wed as high pressure begins to build across the region in the wake of the exiting upper trough and downstream of a wrn-CONUS ridge. There remains higher confidence in the evolution of the upper-air pattern late in the week, as an upper trough amplifies in the central CONUS.
High pressure will slide south of the area tonight, with southerly winds returning to southeast Kansas and the Missouri Ozarks late tonight.
922 PM PST Tue Dec 10 2019 Building high pressure over the West will bring dry, mild weather this week.
1033 PM EST Tue Dec 10 2019 Currently - An Atlantic ridge extends west southwestward nosing across the southern Florida Peninsula and into the Gulf of Mexico. Only a few showers have recently developed over the warmer gulf stream waters. Short Term Update - The ridge to our north will retreat some overnight resulting in winds becoming more uniform speedwise out of the east to southeast. A ridge to our north will retreat some back into the Atlantic overnight.
High pressure building in from the southwest should bring southwest winds tomorrow, but the chilly start will mean afternoon highs still 5-10 degrees below normal. High pressure sits over the region, but as high pressure gets pushed east by zonal upper flow, surface winds will become variable before becoming southerly.
1131 PM CST Tue Dec 10 2019 High pressure centered over eastern Nebraska will drift southeast tonight and Wednesday. Models show the high flattening out into an elongated ridge stretching from east Texas northeast into Tennessee, Kentucky, and West Virginia by early Wednesday morning. A weak short wave currently over northeast Nebraska will dig southeast into Iowa tonight and will help to develop a weak warm front across Iowa and northern Illinois. Lows tonight should be similar to last night's, although we might see a little bump before sunrise as the wind turns to the south with the high moving into the lower Mississippi River. With the southerly flow continuing on Wednesday highs are expected to be 5 to 10 degrees warmer than today's in the mid 30s to mid 40s.
Upper level ridging extends across the Rockies and over the high plains giving way to dry northwest flow aloft for western Kansas. The leeside trough over eastern Colorado will deepen later in the morning due to daytime heating that will mix stronger winds to the surface. Winds will continue to blow after sunset with slightly diminished gusts up to 30 mph due to increased cloud cover coming off the Rockies over the aforementioned upper level ridge. This will keep temperatures from dropping near as much as the past couple of nights mainly in the low to mid 30s.
Where fog does develop, think temperatures will remain above freezing so the chances for freezing fog is low at this time. The best chances for freezing fog to occur will be the northern Permian Basin however this is where the driest air resides. Depending on timing of clouds and fog temps could fall to near freezing and freezing fog possibilities do exist. The combination of light winds and clear skies overhead will assist in temperatures dropping to near and below freezing for much of the northern tier of the area, as well as the higher terrain of west TX and southeast NM.
1015 PM EST Tue Dec 10 2019 Cold front and rain showers will move across the area overnight. Dry high pressure will ridge into the area from the north Thursday.
11/06Z TAF Cycle High pressure has settled into the fcst area, with clear skies and VFR conditions expected to persist through the fcst period. Tonight Through Thursday Dry air spread across much of the region from the north today behind a cold front along the Gulf Coast. Given above freezing temperatures and a warm ground, accumulations were generally an inch or less. A large area of high pressure will build into Arkansas tonight/Wednesday, and will provide dry conditions and below average temperatures. This could pose a problem later tonight as temperatures drop below freezing. Patchy ice will likely form, especially on bridges and overpasses. On Thursday, the high will begin shifting to the east.
Today Through Thursday Night WV sat imagery is portraying a progressive upper trough over the Midwest US, and an associated sfc cold front moving S/Ewrd and exiting the mainland off the S/Ern US. Wed, High pressure will slowly begin to shift Ewrd, allowing for return flow and WAA over the region. Precip chances will remain low with widespread subsidence, and temps will begin to warm up once again with highs in the low-50s over much of the area, and lows dipping just below the freezing mark Wed night. Despite some upper forcing for ascent, weak low-level moisture content will likely inhibit rain chances Thurs, with increasing cloud cover, and temps once again reaching into the low-50s across the region.
The lower atmosphere will gradually remoisten and by daybreak may be capable of patchy stratus or light fog near KLBB and KPVW, as we have retained from the previous forecast. Thursday a quick hitting upper level trough passes through the FA.
220 AM CST Wed Dec 11 2019 Southerly flow will develop today as high pressure departs into the Ohio Valley and lee troughing becomes established out west. Surface temperatures as a result will be around 10 degrees warmer than yesterday, and still warmer on Thursday as the low level jet strengthens.
232 AM CST Wed Dec 11 2019 (Today and Tonight) With a moist boundary layer and ongoing radiational cooling, low clouds and patchy fog/freezing fog are affecting our southern and central counties early this morning. The colder readings are expected to be in some of the low-lying areas and river valleys of our Heartland and Northwest Hill Country counties, where winds will be weakest and radiational cooling will be a little stronger.
Quiet conditions are likely during the period as weak ridging aloft transitions eastward across the Intermountain West tonight and into the Western High Plains by Wednesday afternoon, setting up a weakening northwest flow aloft throughout the region. Expect lows well down into the 20s(F) in central Kansas with temperatures closer to 30F, possibly the lower 30s(F), in extreme southwest Kansas where a southwest downslope flow should persist through the night. Prevailing southerlies will draw warmer air into warmer Kansas Wednesday, pushing H85 temperatures up around 5C. However, little moisture return ahead of a weak attendant cold front moving in from the northwest will result in little but a dry frontal passage by Thursday afternoon.
258 AM CST Wed Dec 11 2019 Skies are clear across the Mid-South early this morning with temperatures in the lower 20s to the lower 30s. High pressure will spread across the region today providing dry weather and below normal temperatures with highs in the mid to upper 40s. Tonight, the high will be moving east of the region allowing winds to shift to the south and begin to bring somewhat milder air to the Mid- South. Thursday will remain dry as high pressure remains over the Mid-Atlantic region. Temperatures will be a little warmer with highs in the low to mid 50s. By Thursday night, low pressure is expected to develop over the western Gulf of Mexico.
Areas of fog this morning is possible as breaks in the low level stratus are allowing some areas to cool more efficiently. Hedged the forecast on blended guidance and have highs in the mid to upper 50's, if cloud coverage lingers this afternoon, temperatures could be up to 5 degrees cooler. Highs Thursday will be 5 to 10 degrees warmer than Wednesday.
This morning, a broad closed low was centered over the Hudson Bay with the main cold front placed across the east coast and a secondary cold front stretching from the Great Lakes region into eastern Nebraska. Theta-e advection at the low-mid levels will increase in response and develop an area of one to three inches of snow stretching from northwest North Dakota east/southeast through the eastern portion of the state this afternoon and evening.
438 AM MST Wed Dec 11 2019 Upper level analysis has large trof across the Great Lakes region with ridge over the Northern Rockies. At the surface, Arctic high is located across the Dakotas with lee trof developing across Montana into eastern WY. Temperatures across the forecast area at 3am range from the single digits across north central SD, to the lower 30s in southern Campbell County in WY. Upper ridge will flatten and shift into the Northern Plains today with slightly warmer air moving into the area aloft. As arctic air slowly departs the western SD plains, areas of light freezing fog along the eastern edge of the Black Hills will slowly dissipate by late morning. Weak upper ridging continues into Thursday with mild temperatures expected.
712 AM EST Wed Dec 11 2019 High pressure will build in today, but another shot of cold air will push in from the north during the evening and early tonight.
Tonight-Thursday: Low temperatures will be much warmer with increasing winds during the evening and winds remaining brisk throughout the night.
Today: High pressure moving through the Western Great Lakes will leave a light easterly wind in place through the first half of the day. An area of low pressure moves through after midnight. We'll need to monitor for at least a low end potential for flurries or perhaps light freezing drizzle into Thursday morning.
Another cold day is in store today, but warmer temperatures are expected to briefly make an appearance for the end of the week. Ahead of another low pressure system approaching the area, models are showing pressure gradients tightening up over the region leading to sustained winds of up to 15 kts and gusts up to 25 kts and an increase in cloud coverage Thursday.
A western Atlantic ridge extending near our region today will retreat eastward, as a shallow cold front/trough drops southward and to along the north coast of the island of Cuba by Thursday morning.
232 AM MST Wed Dec 11 2019 MORNING DISCUSSION: Synoptic Setup: Forecast begins with the coldest airmass settled over Ontario and its influence running back west to the high Plains of the northern US and Canada. A relatively warm ridge runs up the North American Coast into Alaska whose influence spills over the Intermountain west and right up to the front range.
Clearing continues this morning as high pressure begins building to our west and across the area in the wake of the exiting upper trough. Return flow will begin Thursday morning as high pressure exits the area, with afternoon temperatures rebounding into the mid 30s/40s.
Temperatures today as expected to return to near normal as a warm front moves back to the north under mostly sunny skies. Highs tomorrow will be a few degrees warmer than today with continued warm air advection.
/issued 542 AM CST Wed Dec 11 2019/ The cold front that moved through yesterday morning has moved into the central gulf this morning. The area of high pressure to our north is expected to move rapidly to the northeast and looks to be in the New England states by sunrise on Thursday. but the high ridge back down into Texas and Louisiana.
Another cold day is in store today, but warmer temperatures are expected to briefly make an appearance for the end of the week. Surface analysis early this morning showed a ridge of high pressure stretching across the Tennessee River Valley into southern Ohio. Another High pressure system was found over Wisconsin. Ahead of another low pressure system approaching the area, models are showing pressure gradients tightening up over the region leading to sustained winds of up to 15 kts and gusts up to 25 kts and an increase in cloud coverage Thursday.
518 AM EST Wed Dec 11 2019 High pressure will build in today, but another shot of cold air will push in from the north during the evening and early tonight.
Cloud cover persists across portions of central South Dakota at this hour, keeping temperatures at bay above zero, but high pressure has built in further northeast and skies have cleared. Cloud cover will continue to complicate the temperature forecast today, keeping those underneath warmer than not. Snow, as opposed to freezing drizzle, appears most likely as there will be saturation in the DGZ with cloud bases around 2000 ft.
There may also be some patchy freezing fog where the morning low temperatures drop below freezing, mainly across portions of Southeast New Mexico, the northern Permian Basin, and in the Davis Mountains and portions of the Marfa Plateau. Thus, in addition to the visibility reductions, slick spots on bridges and overpasses will also need to be watched for this morning. Temperatures will be warmer this afternoon than yesterday, but still several degrees below normal with highs in the 50s for much of the area. Thereafter, broad low-amplitude ridging over the western CONUS with a trough to the east will maintain dry northwesterly flow aloft over West Texas and Southeast New Mexico.
417 AM CST Wed Dec 11 2019 Cloud cover persists across portions of central South Dakota at this hour, keeping temperatures at bay above zero, but high pressure has built in further northeast and skies have cleared. Cloud cover will continue to complicate the temperature forecast today, keeping those underneath warmer than not. Snow, as opposed to freezing drizzle, appears most likely as there will be saturation in the DGZ with cloud bases around 2000 ft.
A cloud deck will move west to east overnight and keep low temperatures warmer than the past few nights in the 30s before clearing by the morning.
350 AM MST Wed Dec 11 2019 Upper level analysis has large trof across the Great Lakes region with ridge over the Northern Rockies. At the surface, Arctic high is located across the Dakotas with lee trof developing across Montana into eastern WY. Temperatures across the forecast area at 3am range from the single digits across north central SD, to the lower 30s in southern Campbell County in WY. Upper ridge will flatten and shift into the Northern Plains today with slightly warmer air moving into the area aloft. As arctic air slowly departs the western SD plains, areas of light freezing fog along the eastern edge of the Black Hills will slowly dissipate by late morning. Weak upper ridging continues into Thursday with mild temperatures expected.
530 AM CST Wed Dec 11 2019 Southerly flow will develop today as high pressure departs into the Ohio Valley and lee troughing becomes established out west. Surface temperatures as a result will be around 10 degrees warmer than yesterday, and still warmer on Thursday as the low level jet strengthens.
The last remaining snow showers have nearly exited the ridges this morning. Sky clearing is already occuring for the western half of the CWA as high pressure begins building to our west and across the area in the wake of the exiting upper trough. Return flow will begin Thursday morning as high pressure exits the area, with afternoon temperatures rebounding into the mid 30s/40s.
625 AM EST Wed Dec 11 2019 Dry high pressure will build into the area from the north today and Thursday.
908 AM EST Wed Dec 11 2019 Cold front over the Big Bend/N FL Peninsula approaching the I-4 Corridor this mrng. Previous Discussion: A cold front will push through the area today and stall out around the Treasure Coast waters by this evening.
An upper trough axis will pivot east of central Kentucky this morning. Modest WAA in the lower levels will help keep temps from plummeting too much, but lows in the mid 20s will still be common. Low lying areas in southern IN and the Bluegrass region are likely to dip into the lower 20s. Dry and cool weather continues into Thursday as the lower Ohio Valley remains in quasi-zonal flow aloft.
414 AM CST Wed Dec 11 2019 As of 09Z Wednesday morning, midlevel troughing continues to dominate the eastern CONUS, while subtle ridging is positioned across the west ahead of a strong midlevel low off the Pacific Northwest coast. Temperatures will remain in the lower 40s behind the aforementioned front in far northeast KS, whereas temperatures should reach the upper 40s and lower 50s elsewhere. Transitioning into tonight, surface lee troughing will rapidly deepen as a midlevel trough encroaches the Rockies.
With yesterday's cold front now well to our east, a ridge of high pressure will settle over Middle Tennessee today, then move off to the east overnight.
There is warm air advection and temperatures will be warmer than yesterday. The warm advection continues tonight and expect warmer temperatures through the night.
As of 09Z Wednesday morning, midlevel troughing continues to dominate the eastern CONUS, while subtle ridging is positioned across the west ahead of a strong midlevel low off the Pacific Northwest coast. Temperatures will remain in the lower 40s behind the aforementioned front in far northeast KS, whereas temperatures should reach the upper 40s and lower 50s elsewhere. Transitioning into tonight, surface lee troughing will rapidly deepen as a midlevel trough encroaches the Rockies.
542 AM CST Wed Dec 11 2019 The cold front that moved through yesterday morning has moved into the central gulf this morning. The area of high pressure to our north is expected to move rapidly to the northeast and looks to be in the New England states by sunrise on Thursday. but the high ridge back down into Texas and Louisiana.
A trough moving through the area may bring some light showers to the Sierra this morning. High pressure will build back over the area tonight through Thursday with dense fog possible across the San Joaquin Valley overnight.
Except for some small pockets of low stratus in northeast Utah and the Black Canyon of the Gunnison and thin cirrus moving through the ridge, skies were clear or mostly clear this morning.
11/12Z TAF Cycle VFR conditions will persist through the period as high pressure dominates the fcst area. Today Through Thursday Night WV sat imagery is portraying a progressive upper trough over the Midwest US, and an associated sfc cold front moving S/Ewrd and exiting the mainland off the S/Ern US. Wed, High pressure will slowly begin to shift Ewrd, allowing for return flow and WAA over the region. Precip chances will remain low with widespread subsidence, and temps will begin to warm up once again with highs in the low-50s over much of the area, and lows dipping just below the freezing mark Wed night. Despite some upper forcing for ascent, weak low-level moisture content will likely inhibit rain chances Thurs, with increasing cloud cover, and temps once again reaching into the low-50s across the region.
/issued 258 AM CST Wed Dec 11 2019/ Skies are clear across the Mid-South early this morning with temperatures in the lower 20s to the lower 30s. High pressure will spread across the region today providing dry weather and below normal temperatures with highs in the mid to upper 40s. Tonight, the high will be moving east of the region allowing winds to shift to the south and begin to bring somewhat milder air to the Mid- South. Thursday will remain dry as high pressure remains over the Mid-Atlantic region. Temperatures will be a little warmer with highs in the low to mid 50s. By Thursday night, low pressure is expected to develop over the western Gulf of Mexico.
430 AM MST Wed Dec 11 2019 For today, a flat upper level ridge will be over the area, with some increase in mid and high level moisture by aftn. At the sfc, a lee trough will develop along the front range, with downslope low level flow by aftn. This should lead to warmer temperatures across most of the plains. By tonight, a weak upper level trough will move across the area. In addition, will see increasing wind over the higher terrain as well,as cross barrier flow reaches the 35-40 kt range.
/issued 232 AM CST Wed Dec 11 2019/ (Today and Tonight) With a moist boundary layer and ongoing radiational cooling, low clouds and patchy fog/freezing fog are affecting our southern and central counties early this morning. The colder readings are expected to be in some of the low-lying areas and river valleys of our Heartland and Northwest Hill Country counties, where winds will be weakest and radiational cooling will be a little stronger.
Lower ceilings are expected to begin moving in from the south tomorrow morning as a low pressure system passes south of Louisiana.
Today through Thursday A weak boundary slowly drifted north out of Kansas as a warm front this afternoon, bringing southerly low level flow over the area. High temperatures should manage to reach slightly higher than yesterday, ranging from the low 20s over northeast Nebraska to close to 40 degrees along the NE/KS border.
1020 AM CST Wed Dec 11 2019 Based on new model output, bufkit soundings, and track of short wave trough/lift coming through our cwa tonight, have increased pops through this time period. Cloud cover persists across portions of central South Dakota at this hour, keeping temperatures at bay above zero, but high pressure has built in further northeast and skies have cleared. Cloud cover will continue to complicate the temperature forecast today, keeping those underneath warmer than not. Snow, as opposed to freezing drizzle, appears most likely as there will be saturation in the DGZ with cloud bases around 2000 ft.
1025 AM CST Wed Dec 11 2019 Based on new model output, bufkit soundings, and track of short wave trough/lift coming through our cwa tonight, have increased pops through this time period. Cloud cover persists across portions of central South Dakota at this hour, keeping temperatures at bay above zero, but high pressure has built in further northeast and skies have cleared. Cloud cover will continue to complicate the temperature forecast today, keeping those underneath warmer than not. Snow, as opposed to freezing drizzle, appears most likely as there will be saturation in the DGZ with cloud bases around 2000 ft.
Southerly flow will develop today as high pressure departs into the Ohio Valley and lee troughing becomes established out west. Surface temperatures as a result will be around 10 degrees warmer than yesterday, and still warmer on Thursday as the low level jet strengthens.
High pressure/dry air now settled over the region. Full sun expected today and temps are expected to lift into the low/mid 40s. With yesterday's cold front now well to our east, a ridge of high pressure will settle over Middle Tennessee today, then move off to the east overnight.
A light return flow will commence Thu afternoon and an upper level trough will approach the Ohio Valley from the west.
With the cloud cover, temperatures have stayed a bit cooler than forecast for many places today. Nevertheless its still noticably warmer than yesterday.
High temperatures tomorrow will be pleasant and in the lower 60s from the west winds in response to an upper-level trough that will pivot over the southern Great Plains.