Aikyam-Lab/Synoptic-Bench huggingface dataset:
403 AM CST Wed Dec 9 2020 Today, an upper-level ridge will shift eastward across the central U. The upper-level ridge is expected to continue eastward into the eastern U. on Thursday while an upper-level cutoff low interacting with an approaching northern stream upper-level trough begins to exit the southwest U. In response to associated low-level height falls at the lee of the Rocky Mountains in advance of the cutoff low/trough, low-level flow in the Midwest will begin to back to the south causing WAA to ensue across the region. This evolution should allow Thursday's high temps to be similar to today's, possibly warmer depending on extent of upper-level cloud coverage and if low- level flow can veer slightly throughout the day.
A dry cold front dropping down from the northwest will bring cooler temperatures and gusty north winds to the region going into the weekend. High clouds have thinned out somewhat overnight but should increase later today and tonight ahead as the upper low makes forward progress. Temperatures will be about 7-10 degrees lower from Kingman southward while the highs across the rest of the region will not change much from today.
401 AM CST Wed Dec 9 2020 Record temperatures continue to be the main story in the short term as warming at 850 mb combined with abnormally dry air and slight downslope winds combine to push temperatures into the lower 70s across portions of eastern Oklahoma and the Arkansas River Valley.
438 AM MST Wed Dec 9 2020 Persistent upper-level ridging will promote one more very warm and dry day across southeast Wyoming & the western Nebraska Panhandle, with H7 temperatures on the order of +4 to +6 deg C likely helping to support daytime highs in the 60s to possibly near 70 F over the eastern Plains. This threat will quickly diminish by 06z w/ the passage of the cold front.
Upper ridging will continue to support dry and mild conditions today with sunny skies across the region. Readings will be in the upper 30s across the Golden Triangle to the lower 40s elsewhere.
/Issued 1120 PM CST Tue Dec 8 2020/ /Overnight through Wednesday/ High pressure aloft and very dry air through a deep layer of the atmosphere will result in a clear sky tonight and a sunny sky on Wednesday. Highs will range from the lower 70s in the northeast to the upper 70s across the southwest.
639 AM EST Wed Dec 9 2020 High pressure over the Tennessee Valley today will move across the Appalachians on Thursday.
649 AM EST Wed Dec 9 2020 High pressure over the Ohio Valley will move east on Thursday, with a warm, southerly flow expected through the remainder of the week.
Southwest flow was occurring at the surface, which, in addition to the 850 mb thermal ridge strengthening, is bringing temperatures 5- 10 degrees higher than 24 hours ago. With low level/southerly south to southwest flow strengthening tonight into tomorrow as low pressure across the TX Panhandle strengthens, additional warming and higher dewpoints will move into the region. This will result in warmer overnight lows tonight in the low to mid 40s, and highs Thursday up into the upper 70s to low 80s. That is when a disturbance will pass across the area bringing a cold front and a chance for rain showers. Beyond that, another cold front will bring a round of cooler temperatures across the area for the weekend.
228 PM CST Wed Dec 9 2020 An upper level ridge is currently situated over Texas today. A cutoff low currently off the coast of Baja California will quickly move eastward this afternoon before transitioning into an open short wave trough over the AZ/NM border early Thursday. This trough will result in increasing cloud cover and slightly cooler temperatures across the western portion of our area Thursday morning. This trough, accompanied by some much needed rain, will be making its way across our region on Thursday. As the trough progresses eastward over Texas, rain will move through the entire area.
Included the mention of freezing drizzle north of I-80 overnight where drizzle would still be possible and sfc temperatures drop below freezing.
High pressure will build overhead Tonight into Thursday. Fog potential inland Tonight, as warmer and more moist air advects across the northeastern gulf, and encounters the cooler air over land.
Winds were generally light and temperatures were running about 5 degrees cooler than forecast. AC Chattanooga Airport, TN 35 65 40 64 48 / 0 0 0 0 10 Knoxville McGhee Tyson Airport, TN 34 61 37 63 43 / 0 0 0 0 10 Oak Ridge, TN 32 61 37 62 43 / 0 0 0 0 10 Tri Cities Airport, TN 30 60 35 62 39 / 0 0 0 0 0.
239 PM EST Wed Dec 9 2020 The pleasant and cooler temperatures, while not as cool, will continue through tomorrow.
337 PM EST Wed Dec 9 2020 High pressure will build across and offshore the middle Atlantic through Thursday night. A low pressure trough will approach the region late this week, moving across North Carolina this weekend. Water vapor satellite displayed an upper-level trough exiting the Mid-Atlantic, and an upper-level ridge across the Southwest. The trough will push away from the region this afternoon, with dry weather continuing across central NC. Skies will continue to gradually clear this evening, then temperatures will only dip into the low to mid 30s tonight as low level thicknesses increase to around 1340m. An upper-level ridge across the Southwest will weaken as it makes its way across central NC on Thursday. At the surface, high pressure will build across VA throughout the day from the west, then transition off the coast by Thursday night.
This will again mean temperatures dipping into the low to mid 50s in the upper Keys, and upper 50s in the middle and lower Keys.
Our 12Z SHV sounding looked similar to the one from 24 hours ago, featuring a huge low level inversion which should efficiently mix out to result in highs in the low to mid 70s. /issued 546 AM CST Wed Dec 9 2020/ With surface and upper-level high pressure prevailing areawide, VFR conditions expected across area terminals through the forecast period ending 10/12Z. A gradual warming trend to continue through the short term period with highs today forecast to climb into the low to mid 70s this afternoon. Trended slightly warmer than guidance on temps today and Thursday based on observed temps biasing higher than forecast over the past several days. Otherwise lows tonight to fall into the upper 30s to lower 40s with highs on Thursday in the low to mid 70s.
Similar conditions are expected Thursday beneath clear skies and strong thermal ridge.
1005 AM CST Wed Dec 9 2020 After a chilly and frosty start, with lows ranging from the lower 20s in spots, to around 30, a nice warm up was in progress across the greater Tennessee Valley. Broad high pressure situated over the Gulf region was the main feature controlling this area's weather.
232 PM CST Wed Dec 9 2020 Tonight and tomorrow: Upper ridging will continue to prevail across the region tonight and through the day tomorrow. At the surface, high pressure will gradually slide east into the southeast states by tomorrow evening.
326 PM EST Wed Dec 9 2020 A weak cold front to our northwest, currently over the Midwest, will stall and dissolve before reaching us. Another stronger cold front with much more upper level support will move southeast through the Midwest on Thursday and and Thursday night. Good radiating conditions combined with the warm air advection will be conducive for at least modest ridge/valley temperature differences each night.
1128 AM CST Wed Dec 9 2020 Today, an upper-level ridge will shift eastward across the central U. The upper-level ridge is expected to continue eastward into the eastern U. on Thursday while an upper-level cutoff low interacting with an approaching northern stream upper-level trough begins to exit the southwest U. In response to associated low-level height falls at the lee of the Rocky Mountains in advance of the cutoff low/trough, low-level flow in the Midwest will begin to back to the south causing WAA to ensue across the region. This evolution should allow Thursday's high temps to be similar to today's, possibly warmer depending on extent of upper-level cloud coverage and if low- level flow can veer slightly throughout the day.
100 PM EST Wed Dec 9 2020 High pressure over the Ohio Valley will move east on Thursday, with a warm, southerly flow expected through the remainder of the week.
1013 AM MST Wed Dec 9 2020 Morning GOES VIS imagery detected increasing mid/high clouds across MT ahead of the upper trough and cold front that will bring an abrupt to our unseasonably mild and dry weather. Persistent upper-level ridging will promote one more very warm and dry day across southeast Wyoming & the western Nebraska Panhandle, with H7 temperatures on the order of +4 to +6 deg C likely helping to support daytime highs in the 60s to possibly near 70 F over the eastern Plains. This threat will quickly diminish by 06z w/ the passage of the cold front.
Still looking at moistening of the lower levels to begin across the area this evening in light southwesterly flow.
Weak ridging aloft will control our weather for another 24 hours before our next upper level system approaches from the west.
JW 18Z TAFS: The low ceilings are not looking like they will be rising in the Columbia Basin this afternoon as fog continues to build. Winds from the west are going to keep the low ceilings and fog in Pullman likely through the afternoon with clearing possible this evening.
252 PM CST Wed Dec 9 2020 Mid-level ridging has helped us eclipse the 50-degree mark in most spots this afternoon, under mostly sunny skies and a warming westerly wind.
256 PM EST Wed Dec 9 2020 High pressure will provide for dry conditions and a gradual warming trend through the end of the work week.
1121 AM CST Wed Dec 9 2020 An upper level trough was situated across parts of the Southeast US extending NNE into the Atlantic while northwest mid/upper flow prevails upstream across the central CONUS. Meanwhile, another upper level trough was situated off the California/Baja coast over the Pacific. Another mild day is anticipated across the Central Plains today as a mid/upper ridge translates eastward across the region. The upper low off the California coast is progged to move into the Southwest States tonight before emerging across the Southern Rockies as we move into Thursday. Highs on Thu are expected to remain well above normal for mid December, however cooler compared to values on Wed.
206 PM CST Wed Dec 9 2020 A bright and spectacular day out there today courtesy of a ridge of high pressure moving overhead. A few high clouds will be drifting across the area today, related to low pressure passing along the U. A cold front moving in from the Northern Plains will pass through the area Thursday.
Southwest flow was occurring at the surface, which, in addition to the 850 mb thermal ridge strengthening, is bringing temperatures 5- 10 degrees higher than 24 hours ago. With low level/southerly south to southwest flow strengthening tonight into tomorrow as low pressure across the TX Panhandle strengthens, additional warming and higher dewpoints will move into the region. This will result in warmer overnight lows tonight in the low to mid 40s, and highs Thursday up into the upper 70s to low 80s.
A dry cold front dropping down from the northwest will bring cooler temperatures and gusty north winds to the region going into the weekend.
Overnight lows will increase as well as the flow turns more southwest with time ahead of the developing trough.
Well above normal temperatures and sunny skies are occuring today and will again on Thursday, but may be even a degree or two warmer.
/Issued 426 AM PST Wed Dec 9 2020/ A weak and shallow cold front is pushing into the Cascades this morning with light precipitation that appears to be falling as rain up to about 7,000 foot elevations. We've been closely watching surface temperatures along and near the Cascades, especially in the Chemult area, to see if precipitation falls in the areas with below freezing temperatures. It is possible that some sheltered low elevation cold pockets such as the Fish Lake and Howard Prairie areas as well as areas along and near Highway 97 around and in Chemult could see a little bit of freezing rain or freezing drizzle this morning. High pressure will build in rapidly this afternoon with wind gusts of 20 to 40 mph from the northeast across the mountains and through the gaps, especially from the Cascades westward.
Mid and upper level ridging continues building into the region through this afternoon. High temps Thursday will be in the upper 60s to low 70s across the region, given the dominant ridging and dry conditions overhead across the region with some areas potentially getting a few degrees warmer.
Generally clear skies will continue through the afternoon before clouds increase late this evening ahead of the approaching wave and cold front. As the cold front surges southward, moisture will be lacking above ~800mb, although modest frontogenetic forcing may result in very spotty light drizzle or rain/snow across the NW third of the forecast area overnight tonight into early Thursday morning. Expect cooler and dry weather Thursday as temperatures will struggle to rise out of the 30s under persistent cloud cover.
A cold front will enter northwest Oklahoma Thursday morning or early afternoon ahead of our next system.
249 PM CST Wed Dec 9 2020 Currently, an upper-level ridge is dictating the weather across most of the contiguous United States, including the Middle Mississippi Valley, as an upper-level low sits off the coast of Baja. Temperatures have climbed into the low to mid-60s for most locations - around 20 degrees warmer than climatological norms. For tomorrow, the aforementioned upper-level low will eject into the Southwest as upper-level ridging holds over the Middle Mississippi Valley.
136 PM CST Wed Dec 9 2020 Finally, we have plenty of sunshine today with a broad area of high pressure to our south and an upper ridge situated to our west.
20Z surface analysis shows a high pressure ridge across the eastern Dakotas into western Minnesota, resulting in mostly sunny skies and light winds. This ridge will continue to move eastward this evening and overnight, allowing light southerly return flow to develop ahead of an approaching cold front. 12Z model suite in good agreement, bringing a dry cold front across the region Thursday morning. Primary impacts to sensible weather will be cooler temperatures (with afternoon highs in the 40s), modest northwest breezes, and some mid-high level cloud cover.
Another quiet night is expected with lows from the lows 40s far inland to near 60s across the islands. With the thermal ridge in place, strong southerly WAA and 925:850 hPa temperatures in the lower teens Celsius, Thursday is shaping up to be another warm day.
A powerful southern stream cyclone may track close enough to the area to bring some snow to east-central Wisconsin this weekend. Tonight and Thursday Quiet weather is expected during the short-term portion of the forecast as a broad/weak anticyclone shifts off to the southeast. Trended toward the cooler bias-corrected guidance products to account for this. Expect more in the way of passing middle and high clouds tomorrow, and combined with limited mixing and a strengthening low-level inversion that may keep max temps a little cooler than today.
Otherwise, expect lows in the low to mid 30s in most spots.
A weak trough moving through the area today is expected to have minimal impact, other than slight chance for snowfall along the northern forecast area boundary. With a transitory ridge building over the area on Thursday, expect stagnant conditions to continue.
223 PM CST Wed Dec 9 2020 High pressure will drift east across OH/PA region tonight and tomorrow, bringing a continuation of the dry and milder weather conditions.
1005 AM MST Wed Dec 9 2020 Morning GOES VIS imagery detected increasing mid/high clouds across MT ahead of the upper trough and cold front that will bring an abrupt to our unseasonably mild and dry weather. Persistent upper-level ridging will promote one more very warm and dry day across southeast Wyoming & the western Nebraska Panhandle, with H7 temperatures on the order of +4 to +6 deg C likely helping to support daytime highs in the 60s to possibly near 70 F over the eastern Plains. This threat will quickly diminish by 06z w/ the passage of the cold front.
/TW/ Upper ridging will continue to support dry and mild conditions today with sunny skies across the region. Readings will be in the upper 30s across the Golden Triangle to the lower 40s elsewhere.
After a chilly and frosty start, with lows ranging from the lower 20s in spots, to around 30, a nice warm up was in progress across the greater Tennessee Valley. Broad high pressure situated over the Gulf region was the main feature controlling this area's weather.
1113 AM CST Wed Dec 9 2020 An upper level ridge over the Rockies will shift east into the central CONUS with unseasonably warm temperatures. Went on the higher side of the suite of temperature guidance for the next couple of days which has worked out well recently, especially with a west to southwest sfc wind. Highs in the 60s and low 70s are expected with slightly warmer readings expected Thursday.
High pressure across the region with sunny skies and cool temperatures for another below normal temperature day across South Florida. With that easterly component off the warmer water our temperatures will gradually moderate with highs a few degrees higher tomorrow across the area and should make it into the 70s.
Winds were generally light and temperatures were running about 5 degrees cooler than forecast. High pressure to dominate during this taf cycle with light sly flow at all sites. CDG Chattanooga Airport, TN 58 35 65 40 64 / 0 0 0 0 0 Knoxville McGhee Tyson Airport, TN 54 34 61 37 63 / 0 0 0 0 0 Oak Ridge, TN 53 32 61 37 62 / 0 0 0 0 0 Tri Cities Airport, TN 50 30 60 35 62 / 0 0 0 0 0.
/issued 556 AM CST Wed Dec 9 2020/ Upper ridging will move across the area as light southwest surface flow brings in some mild air through Thursday.
521 PM CST Wed Dec 9 2020 High pressure shifts into the region overnight, decreasing winds, and continuing the clear skies. High pressure was shifting out of the eastern Plains and across Missouri this afternoon, as it tracks towards the Midwest. The well above normal temperature trend that arrived today will continue into Thursday, as the High pressure slides to the mid-Atlantic states. This will be with the arrival of the warm nose sector of the Low pressure system that will impact the local area this weekend. The upper level pattern adjusts toward the end of the week and into the weekend, as the upper Low pressure system arrive.
220 PM MST Wed Dec 9 2020 Afternoon WV/IR imagery animation showed a closed low off southern CA/northern Baja, a low-amplitude ridge over the Plains, and trough amplifying over the Pacific Northwest. The short term forecast challenges will be timing of cold frontal passage, temperature trends and chances for accumulating snow late in the period. Cold front is progged to accelerate southeast across WY this evening and clear the NE Panhandle after midnight. The upper trough to the west moves through the CWA late Thursday, with low pressure developing over western CO. Northeasterly upslope flow and lift from the passing trough will produce areas of light snow Thursday night.
539 PM CST Wed Dec 9 2020 A bright and spectacular day out there today courtesy of a ridge of high pressure moving overhead. A few high clouds will be drifting across the area today, related to low pressure passing along the U. A cold front moving in from the Northern Plains will pass through the area Thursday.
Low level atmospheric ridging influences along with building west to east quasi upper level ridging influences thru 10/24Z expected.
343 PM CST Wed Dec 9 2020 Conditions will continue to be dry through Thursday night across the cwa with the main changes in the weather being cooler highs on Thursday and breezy northwest winds. The models then show a cold front moving into our western cwa by midnight and moving east through the night. As these clouds move away on Thursday, mid and high level clouds from the western upper low pressure trough will move in and remain into Thursday night. Cooler highs in the upper 30s to the lower 40s are expected on Thursday which is still 10 to 15 degrees above normal. Lows will be in the upper teens to the lower 20s under mostly cloudy skies.
922 PM EST Wed Dec 9 2020 High pressure will provide for dry conditions and a gradual warming trend through the end of the work week.
Temperatures were tweaked down 1-2 degrees in portions of north MS and west TN where temperatures have already fallen into the lower 40s. The trough over the eastern CONUS is currently lifting across New England with the flow aloft becoming more zonal over the middle of the country. Meanwhile, the trough approaching the PacNW coast has broken down the Rex Block and the deep cut-off low near SoCal will finally transition into an open wave and move east.
442 PM MST Wed Dec 9 2020 Afternoon WV/IR imagery animation showed a closed low off southern CA/northern Baja, a low-amplitude ridge over the Plains, and trough amplifying over the Pacific Northwest. The short term forecast challenges will be timing of cold frontal passage, temperature trends and chances for accumulating snow late in the period. Cold front is progged to accelerate southeast across WY this evening and clear the NE Panhandle after midnight. The upper trough to the west moves through the CWA late Thursday, with low pressure developing over western CO. Northeasterly upslope flow and lift from the passing trough will produce areas of light snow Thursday night.
/issued 228 PM CST Wed Dec 9 2020/ An upper level ridge is currently situated over Texas today. A cutoff low currently off the coast of Baja California will quickly move eastward this afternoon before transitioning into an open short wave trough over the AZ/NM border early Thursday. This trough will result in increasing cloud cover and slightly cooler temperatures across the western portion of our area Thursday morning. This trough, accompanied by some much needed rain, will be making its way across our region on Thursday. As the trough progresses eastward over Texas, rain will move through the entire area.
A dry atmosphere with high pressure just off the lower Texas coast will provide VFR conditions through Thursday. /issued 305 PM CST Wed Dec 9 2020/ SHORT TERM (Tonight through Thursday Night): A large 500 mb closed Baja Cali low will steadily build a ridge axis over the RGV throughout the short term period. Also, low level WAA will be on the increase on Thurs and Thurs Night as the Baja Cali closed low will open up and move eastwards towards the South Central Plains States. This will increase the low level winds from the S-SE which will allow the temps and dewpoints to rebound. Will be going closer to a GFS/ECMWF blend for high temps tomorrow as the NAM still wants to keep the highs on Thurs in the upper 70s.
527 PM CST Wed Dec 9 2020 Currently, an upper-level ridge is dictating the weather across most of the contiguous United States, including the Middle Mississippi Valley, as an upper-level low sits off the coast of Baja. Temperatures have climbed into the low to mid-60s for most locations - around 20 degrees warmer than climatological norms. For tomorrow, the aforementioned upper-level low will eject into the Southwest as upper-level ridging holds over the Middle Mississippi Valley.
With 925 hpa temperatures near 10 C, expect highs to climb into the lower 60s F across the forecast area. Stalling cold front is expected to push into the forecast area Thursday afternoon and remain across the forecast area until deepening trough lifts into the upper Midwest.
424 PM CST Wed Dec 9 2020 Updated Aviation discussion for 00Z TAF Issuance High pressure will drift east across OH/PA region tonight and tomorrow, bringing a continuation of the dry and milder weather conditions.