Aikyam-Lab/Synoptic-Bench huggingface dataset:
Areas nearest saturation remains along the lower Arkansas River valley southward where some clearing may occur as cirrus shield lifts north late tonight. Lee troughing on Monday will help southerly winds increase to near 10kt for most TAF sites. /Issued 924 PM CST Mon Dec 23 2019/ Animation of IR satellite imagery indicates considerable high level cloudiness rounding the ridge over the Southern Plains and streaming into the area from the southwest and west this evening. Latest surface analysis indicates low pressure centered over the High Plains of sern CO, with light southerly wind across much of ern OK.
238 AM EST Tue Dec 24 2019 Except for an isolate sprinkle or flurry early this morning, high pressure will keep mild and clear weather over NY and PA through the Christmas holiday. After a very mild day, a cold front with limited moisture will drop across Upstate NY into PA overnight. Temperatures will fall into the lower 20s. Period begins with ridging over the Great Lakes and a trough off the east coast.
820 PM MST Mon Dec 23 2019 With light winds and Relative Humidities (RH) ranging from 92% to 100% throughout north central Montana, dense freezing fog has formed, again, and an advisory has been issued. Dense fog continues to affect areas north of Highway 2, and the highlight could be extended after 3 PM for a portion of the region.
256 AM EST Tue Dec 24 2019 The latest regional surface analysis shows low pressure now off the Georgia and South Carolina coast. The low will pull out through the afternoon hours allowing for drier air to filter into the area as skies become partly cloudy for the first time in days. Upper ridge will replace the trough Tue night and although clear skies and radiational cooling will allow for some upper 30s and 40s, this will still be some 5 to 7 degrees above normal.
CDG Chattanooga Airport, TN 67 44 64 45 64 / 0 0 0 0 10 Knoxville McGhee Tyson Airport, TN 65 40 63 42 64 / 0 0 0 0 0 Oak Ridge, TN 65 42 63 43 63 / 0 0 0 0 10 Tri Cities Airport, TN 64 37 62 39 64 / 0 0 0 0 0.
138 AM MST Tue Dec 24 2019 Upper trough axis centered from the Pacific NW through the southern CA coast continues to push slowly eastward. Ahead of this trough a broad area of mid-to-high clouds continues to blanket the region. Resulting gradual uplift will result in areas of low clouds and freezing fog/freezing drizzle later this afternoon through early Christmas Day.
The NW breezes are bringing in a cooler and drier air mass, with surface dewpoints falling to near a pleasant 60 degrees. The low pressure center will exit further east into the Atlantic on Tue and Wed, bringing a steady decrease in winds.
Temperatures were mostly around or just under freezing and low level conditions are moist.
Light precipitation has developed over portions of southwest Idaho this evening in advance of a slow moving trough.
Meanwhile plenty of cirrus associated with Pacific moisture spilling over the ridge axis approaching the forecast area from the west is noted advancing across the wrn zones at this time.
After a crazy 69 recorded at Nashville airport yesterday after the clouds cleared out quicker than expected, an upper level ridge is going to move across the region today. This is going to result in afternoon highs even warmer than yesterday. Christmas Day is going to be more of the same as the upper ridge slides just off to our east.
1036 PM EST Mon Dec 23 2019 A mild evening will be replaced by cooler conditions overnight as a cold front sweeps through the region. High pressure will build into the region from Canada through midweek.
1113 PM CST Mon Dec 23 2019 For tonight, A weak cold front will move into the northwest Sandhills. The NAM model sounding is saturated, with the potential for light freezing drizzle, while the GFS is much drier. Have a slight chance mention for light freezing drizzle and light snow.
1047 PM CST Mon Dec 23 2019 As a deep low continues to batter the southeast US, the central US continues to sit comfortably under an upper ridge that will slowly creep east over the next couple of days. Lee troughing will continue to bring southerly flow to the region and act to tighten the sfc pressure gradient across the area tomorrow. Late in the week a robust trough will deepen along the western US coast with what may be our weekend precipitation maker. There are still quite a few model differences, with respect to strength/timing/location of the 500mb closed low.
An upper level trough currently along the west coast will weaken as it shifts east the next couple of days. Impacts from this weakening trough will be felt across Utah Christmas Eve through Christmas day. One of two upper level circulation cores within the very elongated trough is developing over the central portion of California while the other is much farther south off the central coast of Baja. This does not bode well for any consolidation of this trough in the near future and thus the forecast for general light precipitation looks appropriate for the next 18-24 hrs.
249 AM CST Tue Dec 24 2019 The mid/upper ridge over the central CONUS is progged to translate slowly eastward over the Mississippi Valley area today and into the Ohio and Tennessee Valley areas by tonight.
924 PM CST Mon Dec 23 2019 Animation of IR satellite imagery indicates considerable high level cloudiness rounding the ridge over the Southern Plains and streaming into the area from the southwest and west this evening. Latest surface analysis indicates low pressure centered over the High Plains of sern CO, with light southerly wind across much of ern OK.
This will continue to favor the development of low clouds and fog as warmer air aloft flows over the low level cool air. The low level clouds and fog will wreck havoc on daytime temperatures. Light snow and freezing drizzle continues to be the main feature for Christmas holiday period, with a general consensus of 1 to 2 inches of snow possible and a light glaze of ice.
With light winds and Relative Humidities (RH) ranging from 92% to 100% throughout north central Montana, dense freezing fog has formed, again, and an advisory has been issued. Updated 1050 PM MST Mon Dec 23 2019 (24/06Z TAF period) LIFR/VLIFR conditions prevail at KCTB/KHVR and vicinity KGTF due to low ceilings or freezing fog. Dense fog continues to affect areas north of Highway 2, and the highlight could be extended after 3 PM for a portion of the region.
/issued 420 AM CST Tue Dec 24 2019/ Latest WV imagery and UA analysis shows ridging aloft acrs TX into W LA, with upper low exiting off the east coast of FL. Pac moisture spreading over the top of the ridge was producing some sctd to bkn high clouds acrs the area. 24 Dry weather with cool nights and mild to warm aftns can be expected through Christmas Day as the region remains under the influence of sfc ridging, while the ridge aloft slides further east.
Temperatures will surge into the upper 60s to lower 70s this afternoon as 12-15 Celsius 850-mb air advects into the region beneath an anomalous 500-mb ridge. In response, cyclogenesis will occur in the lee of the Rockies, and the surface pressure gradient across the Ozarks will begin to tighten in between departing high pressure and incoming low pressure. Southerly winds will become gusty ahead of an approaching cold front, with afternoon gusts around 35 MPH.
532 AM CST Tue Dec 24 2019 Water vapor imagery early today showed a plume of high level moisture/cirrus streaming north from the Four Corners area through the broad ridge axis extending into the Upper Midwest. Mixing of the very shallow moist layer should help erode the low clouds and fog through the day, except perhaps farther to the north, with cirrus continuing to stream across the area. Models remain in reasonable agreement for tonight into Christmas Day as a series of weak upper troughs embedded in increasingly southwest flow aloft impact the area. With temps likely hovering close to freezing, could not rule out a bit of freezing drizzle in colder spots with any precip that falls early in the morning.
This trof will not have much of an impact for our area except increasing southerly sfc flow and bringing some more high clouds overhead. The best lift associated with this upper trof will stay west of the region, however a few high- based showers may reach the far western zones this afternoon. Christmas Day will be a few degrees cooler than today, albeit still very mild for this time of year.
515 AM EST Tue Dec 24 2019 Flow aloft across the CONUS remains highly amplified with a closed low aloft continuing to slowly exit our region east into the Atlantic, and upstream ridging over the central CONUS and deep troughing over the western states and Pacific Coast. At the surface, an occluded low pressure system associated with the low aloft is located just off the Southeast coast which has helped advect drier air into the region over the past 24 hours. Ridging aloft will gradually build east and settle over the eastern CONUS in the wake of the departing low while surface ridging over the western Atlantic sets up easterly flow over the area, leading to a stretch of above normal temps for not just Florida but most of the eastern half of the country into the upcoming weekend.
647 AM EST Tue Dec 24 2019 Today is much quieter than yesterday in the wake of the low pressure disturbance. helping to advect somewhat cooler air into the area. As the low pressure system begins to move up the northeast coast, lower ceilings are trying to filter into the region.
Radar indicates isolated showers lingering across the higher elevations of the northern Sierra early this morning. Current temperatures are running cooler compared to 24 hours ago and range from the 20s in the mountain valleys to the 30s through the Central Valley. Weak lingering trough will continue to support isolated showers over the mountains today, otherwise the remainder of the region will remain dry today.
Water vapor imagery showing the amplified upper flow pattern continues with ridging from south Texas into the mid-Mississippi valley and troughing along the west coast. Cirrus continues to spill over the southern Rockies into the central Plains and combine with a moderate low-level jet associated with a deepening lee trough to keep temperatures more mild and fog from making another appearance. 09Z temps are not far from normal highs and continued southerly flow and even better insolation today under near-record 850 mb temps support a warmer day, though record values of 68 at both TOP and CNK are likely safe.
Temperatures forecast to climb to around 70 degrees this afternoon with slightly cooler temperatures north of I-30. Upper- ridge to dominate today, providing dry conditions while at the same time allowing for few to scattered high clouds aloft. Upper-ridge to shift east overnight supporting southwest flow areawide, resulting in increased cloud-cover.
The upper trough positioned in western CONUS slowly shifts eastward as the week progresses.
Conditions will be a bit more breezy on Christmas Day given the isallobaric response of the winds from the developing lee cyclone in the west-central Plains, with winds at around 10-20mph Christmas Day across the CWA along with mild temperatures. Precipitation chances begin to increase towards the end of the week as the aforementioned trough pivots across the Desert Southwest towards the southern Great Plains. Upper-level divergence will increase over the CWA in response to the approaching trough/mid-level vorticity maximum.
310 AM CST Tue Dec 24 2019 Water vapor imagery showing the amplified upper flow pattern continues with ridging from south Texas into the mid-Mississippi valley and troughing along the west coast. Cirrus continues to spill over the southern Rockies into the central Plains and combine with a moderate low-level jet associated with a deepening lee trough to keep temperatures more mild and fog from making another appearance. 09Z temps are not far from normal highs and continued southerly flow and even better insolation today under near-record 850 mb temps support a warmer day, though record values of 68 at both TOP and CNK are likely safe.
Upper trof over the western coastal states with moisture streaming north across the Rockies and northern Plains. The remainder of the week will feature split flow with a semi closed low over the desert southwest and the Pacific jet pushing into the northern Rockies. Ebert Mostly LIFR with low clouds and freezing fog.
414 AM EST Tue Dec 24 2019 Areas of freezing fog will lift by late morning.
416 AM MST Tue Dec 24 2019 Upper trough axis centered from the Pacific NW through the southern CA coast continues to push slowly eastward. Ahead of this trough a broad area of mid-to-high clouds continues to blanket the region. Resulting gradual uplift will result in areas of low clouds and freezing fog/freezing drizzle later this afternoon through early Christmas Day.
420 AM CST Tue Dec 24 2019 Latest WV imagery and UA analysis shows ridging aloft acrs TX into W LA, with upper low exiting off the east coast of FL. Pac moisture spreading over the top of the ridge was producing some sctd to bkn high clouds acrs the area. 24 Dry weather with cool nights and mild to warm aftns can be expected through Christmas Day as the region remains under the influence of sfc ridging, while the ridge aloft slides further east.
613 AM EST Tue Dec 24 2019 An anomalous upper level ridge will build over the region the rest of this week.
There remains potential for a low likelihood conditional event/scenario wherein freezing drizzle affects parts of southwest NEB to north central NEB between the early morning-late morning time frame on Christmas Day. Discussion: Latest water vapor imagery shows an upper trough over the West Coast to the offshore waters of Baja California and a ridge that extends from TX across the Middle Mississippi Valley into the Ohio Valley. A signal remains present in HREF QPF/p-type and its prob p-type in support of freezing precip. 1 conditional probabilities for freezing rain/drizzle are low, NBM V3. 2 remained consistent in their runs tonight and those seen last night with a strong signal in its conditional probability of freezing rain.
/issued 256 AM EST Tue Dec 24 2019/ The latest regional surface analysis shows low pressure now off the Georgia and South Carolina coast. The low will pull out through the afternoon hours allowing for drier air to filter into the area as skies become partly cloudy for the first time in days. Upper ridge will replace the trough Tue night and although clear skies and radiational cooling will allow for some upper 30s and 40s, this will still be some 5 to 7 degrees above normal.
Dense fog developed where the cold front stalled last night, in southwest Wisconsin and northern IL. Most of the area is above freezing, but there could be some patchy freezing fog out there, so isolated slick roads are possible. Conditions will remain fairly stagnant across southern WI through Wednesday as weak low pressure develops and sits over the Plains. Lows tonight are expected to remain above freezing, and highs should be a notch warmer Wednesday under continued filtered sunshine.
considerable high clouds will continue to stream across the area today ahead of an upper level trough across the western part of the country. High temperatures look to reach the low 50s to around 60. Could see some freezing fog and reduced visibilities toward sunrise north of a line from around Norton to Wray and perhaps Yuma. Low temperatures range from the mid 20s across the north to the low/mid 30s across the far east through south. freezing fog will be possible in the morning from around Norton to Yuma and points north, otherwise dry with little in the way of cloudiness.
/issued 318 AM CST Tue Dec 24 2019/ (Today and Tonight) Fairly quiet weather pattern expected over the next twenty-four hours as an upper-level ridge over the southern Plains starts to shift eastward. That being said, high temperatures may be a couple of degrees higher today than yesterday, due to slightly warmer air moving in from northern Mexico.
Temperatures will be pleasant, with highs in the mid to upper 70s and lows in the lower to upper 50s.
A nearly stacked and large low pressure system centered just offshore of the northeast portion of the Sunshine State with a couple of associated embedded vorticity lobes will slide further offshore. Meanwhile, a sharp anticyclone will build from the Gulf of Mexico northward into the Great Lakes will move slowly eastward over the next couple of days.
611 AM EST Tue Dec 24 2019 Areas of freezing fog will lift by late morning.
Thermal ridge will move across the area today, with well above normal high temperatures in the upper 60s to around 70.
There is a spread in the temperature guidance Christmas afternoon, with the cooler NAM12/MET model guidance developing clouds over the region, resulting in high temperatures only in the 60s, while the warmer GFS/MAV keeps skies mostly sunny, and highs forecast in the 70s. Blended guidance favors the warmer solution at the moment.
This will continue to favor the development of low clouds and fog as warmer air aloft flows over the low level cool air. The low level clouds and fog will wreck havoc on daytime temperatures. Light snow and freezing drizzle continues to be the main feature for Christmas holiday period, with a general consensus of 1 to 2 inches of snow possible and a light glaze of ice. Some light freezing drizzle is possible Wednesday evening and overnight, mainly over the James River Valley as forecast soundings continue to show very dry mid-levels initially and a very slow saturation.
412 AM CST Tue Dec 24 2019 The upper trough positioned in western CONUS slowly shifts eastward as the week progresses.
504 AM EST Tue Dec 24 2019 An anomalous upper level ridge will build over the region the rest of this week.
Be cautious, especially on bridges and overpasses, until road surfaces warm by later this morning.
318 AM CST Tue Dec 24 2019 (Today and Tonight) Fairly quiet weather pattern expected over the next twenty-four hours as an upper-level ridge over the southern Plains starts to shift eastward. That being said, high temperatures may be a couple of degrees higher today than yesterday, due to slightly warmer air moving in from northern Mexico.
Trends indicate the area from around the Scott and Shasta valleys northeast through Kfalls and most of Klamath County should stay mostly clear of the low clouds into the daylight hours. The low clouds should hang around a while as a veil of high cirrus is moving in to limit sun. Another weak incoming trough is just offshore and will be making its away inland through tonight bringing some light rain and snow.
Upper level ridge in upper levels and southwesterly flow in low levels will continue to produce well above normal temperatures with highs in the 50s and 60s through Wednesday with highs on Wednesday within a few degrees of records.
After a crazy 69 recorded at Nashville airport yesterday after the clouds cleared out quicker than expected, an upper level ridge is going to move across the region today. This is going to result in afternoon highs even warmer than yesterday. Christmas Day is going to be more of the same as the upper ridge slides just off to our east. I blended in some of the highest ensemble members to bring those afternoon highs and morning lows up all week.
Temperatures, this morning, have risen into the upper 60s across the Upper Keys, to the lower 70s in the Middle and Lower Keys.
Have issued a dense freezing fog advisory for areas near and south of a line from Winamac to Ottawa. Fog was becoming dense early this morning along a weak trof/weak wind convergent boundary. Given RWIS sensor data with pavement temps down to freezing or just above and recent history of slippery roads in this scenario, have favored a freezing fog advisory given dense fog at night with a reasonable chance for slick spots developing.
247 PM EST Tue Dec 24 2019 Current surface analysis shows the low pressure system that had been impacting the area over the last few days has pushed far southeast of the forecast area. For the rest of the short term forecast, high pressure will build into the area both aloft and at the surface.
Persistent cloud cover will continue through much of the afternoon for central Florida as residual moisture continues wrapping around the backside of a departing low pressure system.
Quiet and unseasonably warm conditions are in place across the cntrl TN Valley this late Christmas Eve morning, as a large dome of high pressure remains layered from the NE states SW into the lower MS Valley. Current temps have already rebounded into the lower/mid 50s for most areas, from their earlier lows mainly in the lower 40s. Enjoy this nice/tranquil wx as the evening hrs approach this Christmas Eve! A mild Christmas Eve night is expected thanks to the warmer air mass in place across the region, with lows in the mid to upper 40s. With high pressure establishing itself to the east of the area on Christmas Day, strong southerly flow will help to maintain a very warm air mass as temperatures surge close to the 70 degree mark in most locations.
Record highs are safe this afternoon, but one of the warmer Christmas Eves on record to be sure. Thermal ridge will move across the area today, with well above normal high temperatures in the upper 60s to around 70.
340 PM EST Tue Dec 24 2019 An anomalous upper level ridge will continue to bring a lack of cloud cover and mild temperatures to the region for the next couple days.
1103 AM EST Tue Dec 24 2019 An anomalous upper level ridge will build over the region the rest of this week.
This is located beneath a developing upper level ridge and therefore mild temps to continue. A degree or two warmer on Christmas day with highs approaching 70 degrees to the west of the Plateau.
946 AM MST Tue Dec 24 2019 Upper trough axis centered from the Pacific NW through the southern CA coast continues to push slowly eastward. Ahead of this trough a broad area of mid-to-high clouds continues to blanket the region. Resulting gradual uplift will result in areas of low clouds and freezing fog/freezing drizzle later this afternoon through early Christmas Day.
Temperatures today and tomorrow look to track about 10 degrees warmer than average.
137 PM EST Tue Dec 24 2019 High pressure will keep mild and clear weather over the area through Christmas.
Upper level ridge axis shifts slowly eastward and surface winds become more southerly with better WAA for a quick temperature recovery.
Current satellite imagery shows high clouds spilling into the area as an upper level ridge moves into the Mid-South. This ridge will allow for light winds and patchy fog, early tomorrow morning. Warmer than normal conditions will be seen again on Christmas Day as the upper ridge moves eastward with southwest flow increasing over the region. Low temperatures Wednesday night are expected to be in the lower 50s.
Low pressure will move to the southeast through Tonight, as high pressure builds to the north.
1000 AM CST Tue Dec 24 2019 Quiet and unseasonably warm conditions are in place across the cntrl TN Valley this late Christmas Eve morning, as a large dome of high pressure remains layered from the NE states SW into the lower MS Valley. Current temps have already rebounded into the lower/mid 50s for most areas, from their earlier lows mainly in the lower 40s. Enjoy this nice/tranquil wx as the evening hrs approach this Christmas Eve! A mild Christmas Eve night is expected thanks to the warmer air mass in place across the region, with lows in the mid to upper 40s. With high pressure establishing itself to the east of the area on Christmas Day, strong southerly flow will help to maintain a very warm air mass as temperatures surge close to the 70 degree mark in most locations.
154 PM EST Tue Dec 24 2019 High pressure provides dry and relatively warm conditions through the Christmas Holiday. Rain chances increase over the second half of the weekend as a cold front approaches. High pressure in control with dry and warm conditions. A few degrees warmer on Wednesday, as strong upper ridge continues to build across the area. Continued quiet weather expected during the remainder of the week as mid level ridging maintains an influence on the region.