Aikyam-Lab/Synoptic-Bench huggingface dataset:
323 AM CST Wed Dec 21 2016 Looking at a quiet morning and day ahead as a few high clouds drift overhead associated with a cut-off upper low over the Pacific. This system will affect us later this week, but first we will deal with a very warm day today followed by a cold front tonight. Low pressure developing at the surface over the TX Panhandle will lead to westerly downslope flow across our region this afternoon. Weak isentropic lift will also develop behind the front tonight and may lead some drizzle or even freezing drizzle across SE NM if temperatures are cold enough.
320 AM EST Wed Dec 21 2016 Low pressure will pass well north of the area today.
KHUM and possibly KHDC; however, the low ceilings at KGPT and and possibly KASD will be the biggest concern.
1215 AM EST Wed Dec 21 2016 A weak area of low pressure will track along the Maine coast this evening. A warm front will move north of the region tonight. Low pressure passes well north of the area Wednesday.
Expect an initial surge of gusty winds with the cold front, then winds will pick back up again later Wed morning. Strong trof moves through the Rockies and into the Plains for the weekend. A fast moving low pressure system will bring scattered rain and snow showers tonight with MVFR ceilings and local IFR visibility, esp over ne WY and the Black Hills. Gusty west winds will develop late tonight behind a low pressure trough, with the strongest winds expected on the SD plains.
Arctic high pressure remains centered over the eastern portions of the Mid South this evening. Freezing fog should again redevelop over the eastern half of the forecast area by late evening and persist through early Wednesday morning. Areas of dense freezing fog will also be possible and will continue to monitor for a freezing fog advisory and hazardous travel later tonight. Given the weak low level pressure gradient and limited high clouds, freezing fog will again be possible east of the MS River late tonight. Will carry a mention of locally dense freezing fog in the Hazardous Weather Outlook. Advisories for freezing fog will be issued, if needed, by the evening and overnight shifts.
A cold front across extreme northern Utah this evening will move south into central Utah and stall by early Wednesday. Light snow has formed along and to the north of this boundary in response to increasing low-level cold advection and the advance of the southern end of the northern Rockies trough into extreme northwest Utah. Keeping an eye on the upper low currently positioned off the northern Baja coast.
Cold front expected to pass northern terminals around 13z, and to pass AMA around 16z. Cold front passes northern terminals shortly after sunrise, and around 16z Wednesday at AMA. /Issued 410 PM CST Tue Dec 20 2016/ Nearly zonal flow across the Panhandles will continue for the next few days as a large upper level low spins in the Pacific, and weak ridging remains in place across the Gulf Coast.
1242 AM EST Wed Dec 21 2016 High pressure through Wednesday.
407 AM EST Wed Dec 21 2016 High pressure will be centered near the forecast area today and tonight.
The low level moisture will continue rising steadily tomorrow as the surface flow becomes more e- se which will likely result in MVFR ceilings persisting into the afternoon and evening hours around the RGV. Some IFR ceilings will then be possible in the 06-12z time frame tomorrow night as the low levels of the atms saturate. The low level moisture will continue rising tomorrow which will likely result in MVFR ceilings persisting into the afternoon around the RGV. /issued 249 PM CST Tue Dec 20 2016/ SHORT TERM (Tonight through Wednesday Night): The first two periods will be rather benign as high pressure spreads over the area with air mass modification, and with broad mid level ridging aloft.
330 AM EST Wed Dec 21 2016 Morning surface analysis shows an area of high pressure is centered just to to south across the TN Valley. These elements are combining and likely leading to slightly warmer temperatures than expected. That said, went with a blanket SPS for slick spots given much of this will translate to freezing fog.
339 AM EST Wed Dec 21 2016 Unique and potentially dangerous setup this morning as subfreezing surface temperatures and ample lingering low level moisture has resulted in fairly widespread freezing fog with some locations down as low as a quarter mile visibility. There will likely be some slick bridges and overpasses in north GA and north central GA this morning. Have expanded the Freezing Fog Advisory now to include an area along and north of a LaGrange to Macon to Louisville line including all of north GA and the Atlanta metro.
A cold front will shift winds to ne between 00Z- 03Z at HOB and around 03Z at MAF/CNM.
1113 PM MST Tue Dec 20 2016 Went ahead and ended the High Wind Warning for the Laramie Valley, northern Carbon, eastern Platte, and western Converse Counties at 9pm as the potential for strong winds in these areas has ended. The best potential for strong winds has passed for central Laramie and Carbon Counties, including Cheyenne and Rawlins, so allowed the High Wind Warning to end at 5pm. For northern Carbon, eastern Platte, and western Converse Counties, upstream obs indicate there remains some potential of strong mountain wave activity to mix to the surface for a few more hours, so extended the High Wind Warning for these locations through 9pm. 700mb winds easing Wednesday as a cold front presses south into Colorado.
331 AM CST Wed Dec 21 2016 After some patchy morning fog today, temperatures will rise some but remain near normal for this time of year ahead of a cold front. This cold front does not have much if any moisture with it so no precipitation is expected. While this cold front will bring temperature down it will not be anywhere near as powerful as the arctic blast that came through this past weekend. Weak ridging will come in behind this front which will keep the skies clear for the most part and keep temperatures near normal.
934 PM MST Tue Dec 20 2016 Went ahead and ended the High Wind Warning for the Laramie Valley, northern Carbon, eastern Platte, and western Converse Counties at 9pm as the potential for strong winds in these areas has ended. The best potential for strong winds has passed for central Laramie and Carbon Counties, including Cheyenne and Rawlins, so allowed the High Wind Warning to end at 5pm. For northern Carbon, eastern Platte, and western Converse Counties, upstream obs indicate there remains some potential of strong mountain wave activity to mix to the surface for a few more hours, so extended the High Wind Warning for these locations through 9pm. 700mb winds easing Wednesday as a cold front presses south into Colorado.
Another warm day in store for West Central Texas, with afternoon highs climbing into the low to mid 70s. A cold front will arrive across the Big Country late this afternoon, just after max heating, and move through the remainder of West Central Texas tonight. Cooler and drier air mass behind the front, with overnight lows dropping into the 30s.
338 AM EST Wed Dec 21 2016 High pressure through tonight.
Finally, gusty winds at times, favoring higher terrain locations are anticipated during the next 24 hours with the highest potential of stronger winds expected from approximately 05Z to 18Z Wednesday.
404 AM EST Wed Dec 21 2016 Morning surface analysis shows an area of high pressure is centered just to to south across the TN Valley. These elements are combining and likely leading to slightly warmer temperatures than expected. That said, went with a blanket SPS for slick spots given much of this will translate to freezing fog.
1248 AM EST Wed Dec 21 2016 High pressure will remain in place through the middle of the week.
Current temperatures are running in the lower 50s from Tyler to Shreveport, but as cold as 41 in Monroe with clouds nearly overhead. A warmer day is expected on Wednesday with high temperatures again very near normal right around 60 degrees.
400 AM EST Wed Dec 21 2016 High pressure will control the region's weather today.
Highs today will be generally in the lower 60s while lows tonight range from the mid to upper 40s inland to the lower 50s at the coast.
Updated the forecast to adjust hourly wx elements and add patchy freezing fog for tonight into Wed morning. With all locations below freezing tonight, fog will have the potential to freeze mainly on elevated surfaces and roadways if it becomes dense enough. Where the clouds have moved in, temps have been held down in the lower 30s. Some of the high resolution guidance has it expanding again tonight across portions of south and east central KY. If that does develop, we could see a few slick spots again as temperatures drop into the low to mid 20s.
640 AM EST Thu Dec 15 2016 An arctic cold front will surge through VA and NC this morning. Arctic high pressure will follow the front and be over the region tonight through Friday.
Highs today will only make it into the low to mid 30s. The cold temps along with wind gusts arnd 20 mph, especially this mrng, will create wind chills generally in the low teens this mrng and only warming into the mid to upper 20s by the aftn. Winds will diminish tonight as temps bottom out in the lower 20s.
643 AM EST Thu Dec 15 2016 High pressure centered to the west will circulate very cold air across the region today and tonight.
656 AM EST Thu Dec 15 2016 Cool and dry conditions behind an Arctic cold front is producing increasing west to northwest winds of 10 to 15 mph and gusts to as much as 25 mph.
/issued 332 AM CST Thu Dec 15 2016/ A cold front has moved through much of the region tonight resulting in temperatures in the upper 20s (northern zones) to mid 30s (along the Pecos River Valley) at 3am CST.
A warm front moved into north central Idaho and west central Montana last night, causing fairly steady snow this morning. The models are also indicating that the low pressure system that will be moving through the Great Basin wraps precipitation into southwest Montana and Lemhi county Thursday night into Friday morning.
401 AM CST Thu Dec 15 2016 Cool surface ridging has built into the forecast area early this morning with 3 am temps running mainly in the lower to middle 20s. However, the cold air will be slow to scour out, especially in the Rolling Plains where the low stratus will inhibit mixing. We are looking at highs this afternoon ranging from the mid 50s near the Texas and New mexico state line to the lower 40s in the Low Rolling Plains. Temps will be warmer tonight with breezy southwest winds.
Visible satellite indicated some thin cirrus spilling over the upper ridge and moving across the southern zones. Split flow consolidates by Fri ahead of another trough over northwestern Canada. Water vapor loop indicated an upper trough over northern ALTA and northern SASK and another trough off the BC coast. The upper troughs will sweep across the Northern and Central Plains on Sat. A broad upper ridge centered over the US Rockies will shift east tonight.
A weak low pressure system aloft will move slowly south across the area through this evening. High pressure aloft with strong, dry northerly flow will prevail tonight through Friday.
By tomorrow night, the main trough axis pushes the snowfall out and southeast of our CWA and replaces it with the coldest temperatures of the season thus far. With warmer flow off the Pacific streaming across the northern Rockies and the retreat of the Hudson Bay low toward Greenland, conditions across northeast Montana will shift closer to normal.
The warm front has moved into north central Idaho and west central Montana. An arctic cold front will push into the Northern Rockies tonight creating gusty easterly to northerly winds. Also southwest Montana and Lemhi county could continue to experience steady snow as a low pressure moves across southern Idaho tonight. A warm front moved into north central Idaho and west central Montana last night, causing fairly steady snow this morning. The models are also indicating that the low pressure system that will be moving through the Great Basin wraps precipitation into southwest Montana and Lemhi county Thursday night into Friday morning.
910 AM EST Thu Dec 15 2016 A weakening cold front across the central peninsula from near a Melbourne to Sarasota line early this morning will continue to sag southward through the southern forecast area through the afternoon. Temperatures today will be slightly cooler than previous days (though still running above normal) especially across northern and central zones where temperatures should max out around 70 to the lower 70s across the Nature Coast, mid 70s central zones, and upper 70s far south with a slow decrease in humidity values expected which will make for more comfortable outdoor conditions during the afternoon. MVFR cigs from KSRQ north to KTPA, KPIE, and KLAL will improve to VFR by 15Z as drier air continues to overspread the region in the wake of a cold front.
Further south across the I-10 corridor temperatures were on track to get down into the low to mid 40s to the upper 40s near the coastline. The low cloud clearing line was located from Marksville to Oakdale. This cold snap will continue into early Friday morning before finally rebounding Friday afternoon as warmer southerly flow returns across the area.
Snow levels will initially range from 7500-8500 feet, but will fall rapidly to around 5000 feet Friday evening and Friday night as a cold front moves through the area. A ridge, currently peaking in amplitude over the area this morning, will begin to break down this afternoon. This is in response to a decaying sub-tropical moisture stream seen impinging northern and central California, as well as a cold trough moving southward along the west coast. This will be short-lived as strong southwest flow and warm advection develop ahead of the cold front. Wind speeds will likley reach peak gusts near any shower activity, and again on Friday evening as the cold front moves through.
Dry northwesterly flow has eroded the low cloud deck early this morning, and most terminals have returned to VFR conditions as clouds have scattered out. An upper level trough continues to push eastward across the eastern CONUS with its axis now to our east, resulting in northwesterly flow aloft. This is currently mirrored at the surface across our area, with dry northwesterly/northerly flow prevailing as a cold front has moved offshore and now stretches across the northeastern Gulf.
Split flow consolidates by Fri ahead of another trough over northwestern Canada. Water vapor loop indicated an upper trough over northern ALTA and northern SASK and another trough off the BC coast. The upper troughs will sweep across the Northern and Central Plains on Sat. A broad upper ridge centered over the US Rockies will shift east tonight.
As the surface/850 mb ridge shifts east of our area tonight, surface/850 mb winds will become southeasterly/southwesterly.
Only the higher terrain areas of eastern Colorado will see a slight warmup where temperatures may reach the 40s, but expecting 30s for highs elsewhere. Forecast point soundings indicate it might be deep enough for a little light freezing drizzle to develop.
1039 AM EST Thu Dec 15 2016 High pressure centered to the west will circulate very cold air across the region today and tonight.
Due to cloudiness and a cooler airmass trapped below the inversion, high temperatures are only expected to reach the low to mid 50s across the Hill Country and along the Interstate Corridor. Much warmer and above normal temperatures are anticipated for Friday with highs in the upper 60s to lower 70s.
952 AM EST Thu Dec 15 2016 The diffuse, weakening cold front was located from around Fort Myers to West Palm Beach. The cold front will wash out before making it through the Keys.
647 AM EST Thu Dec 15 2016 Cold high pressure will move eastward and be over Virginia and North Carolina today.
As dewpoints fall into the 20s with this backdoor cold front, aftn temps to remain in the lower to mid 40s, but may approach 50 over portions of ne Tx where overnight lows not as cold but skies become partly sunny. Wind to veer with time and increase durg the day Friday as low pressure sets up over southern plains. Low lvls to saturate with inversion as warmer air begins to stream over cold dome near sfc, with patchy warm air advection type lgt showers or drizzle possible Friday from late night low clouds movg into area Thursday night.
A nearly zonal flow across the lower 48 early Friday will amplify as a trough approaches and moves across the western states. Meanwhile, strong southerly winds will prevail across the southern Plains as low pressure deepens across Colorado.
1017 AM EST Thu Dec 15 2016 Cold high pressure will move eastward and be over Virginia and North Carolina today.
Cold front will continue to shift south of a line from Tampa to Melbourne through late morning, eventually shifting south of Lake Okeechobee by this afternoon. Cooler air behind the front will allow temperatures to be closer to normal today, with highs generally in the low to mid 70s over much of the region. Lingering low level moisture behind a cold front that will shift south of the area today, may continue to produce BKN MVFR cigs through early afternoon.
/issued 401 AM CST Thu Dec 15 2016/ Cool surface ridging has built into the forecast area early this morning with 3 am temps running mainly in the lower to middle 20s. However, the cold air will be slow to scour out, especially in the Rolling Plains where the low stratus will inhibit mixing. We are looking at highs this afternoon ranging from the mid 50s near the Texas and New mexico state line to the lower 40s in the Low Rolling Plains. Temps will be warmer tonight with breezy southwest winds.
1027 AM EST Thu Dec 15 2016 An arctic cold front will surge through the Carolinas this morning. Arctic high pressure will build into the region from the NW tonight and Friday. Strong cold advection in the wake of the arctic cold front progressing through central NC this morning will result in mostly clear skies and a brisk NW wind sustained at 15-25 mph with gusts in the 25-35 mph range early/mid afternoon (particularly along/east of Hwy 1). With a brisk NW wind, expect wind chill readings ranging from the upper teens in the far NW Piedmont to the lower/mid 20s elsewhere by mid/late afternoon. With Canadian high pressure building over the Mid-Atlantic/Carolinas overnight, expect chilly overnight lows in the upper teens to lower 20s, coldest in the N/NW Piedmont where the MSLP gradient will slacken the earliest.
828 AM EST Thu Dec 15 2016 Cold front bringing very cold weather today and Friday.
These highlights will weaken through the overnight hours as a warm front progresses through the forecast area. Areas of freezing rain will be possible over these lingering areas as the conversion to rainfall occurs. Cooler temperatures anticipated across the area as the axis of this approaching trough crosses the forecast area by late Friday afternoon.
525 AM MDT SAT SEP 3 2016 Water vapor shows deep upper trof over the pac nw with sw flow aloft through the nrn plains. Temps should be about 10 degrees cooler behind the front from nern WY into nwrn SD. Upper trough will remain across the western US early in the week then slowly move east across the plains midweek.
Tropical Storm Hermine is forecast by NHC to move northeast from the North Carolina Coast into the Mid Atlantic waters through Sunday, as the ridge of high pressure over the Florida Straits moves northward into South Florida this afternoon. High temperatures today should warm up into the lower to mid 90s over the interior and west coast metro areas. A few storms this afternoon could also become strong with gusty winds, frequent lightning strikes, and heavy rainfall, due to some dry air in the mid levels of the atmosphere and the high pwat values. Meanwhile across the South, the Atlantic ridge gradually builds over South Florida bringing in drier air into the area. Southerly wind will continue to subside over the coast waters this weekend with high pressure building across the region.
624 AM CDT SAT SEP 3 2016 VFR conditions to prevail through the terminal forecast period as high pressure settles across the region.
The increasing low level moisture will support potential for isolated daily convection however influence from the strong upper high centered over the Lower Mississippi Valley should keep any precip coverage very low. Stronger flow aloft will also spread southward as the upper high is suppressed with an eventual uptick in precip chances.
1004 AM EDT SAT SEP 3 2016 High pressure centered over Southern Ontario will gradually shift eastward through the weekend.
1043 AM CDT SAT SEP 3 2016 High pressure centered over the Great Lakes this morning is keeping the weather quiet and mostly sunny. Ridge of high pressure extending from the Great Lakes to the Southern Plains will dominate the weather across central Illinois today. An upper-level blocking pattern will be present across the eastern CONUS for the next several days. Further west, pronounced upper ridging will remain in place over the Midwest, leading to a prolonged period of warm and dry weather.
Today will be another nice day across the Ozarks as high pressure remains over the region. Highs will be in the lower to middle 80s during the day.
Temperatures are forecast to be about 2 degrees warmer across the board, with afternoon highs in the mid/upper 80s. This should keep overnight lows slightly warmer, with most areas remaining in the mid/upper 60s.
612 AM CDT SAT SEP 3 2016 228 AM CDT High pressure is settling over the region and will dictate our weather through Labor Day. The upper level low associated with Hermine will stall just off of the mid east coast tonight.
Thus believe that the GFS and ECMWF indicate thunderstorms developing too far north in the CWA while the HRRR shows storms more correlated to where the higher surface moisture is. Otherwise, highs should be running in the low to mid 90s with New Orleans and Hammond being the hotspots. The upper trough to the east will be quickly lifting northeast while while a maritime upper level ridge builds over the gulf south over the next few days. The ridge will begin to translate into a more continental ridge and then start to shield the CWA from convection as the center moves close to the northern coast of the Gulf of Mexico.
606 AM CDT SAT SEP 3 2016 High pressure remain in control both on the surface and aloft. Latest surface analysis shows high pressure sitting over the Great Lakes states and tropical system Hermine heading up the east coast. The result for us will be northeast winds keeping the cooler and drier air in place.
/issued 624 AM CDT SAT SEP 3 2016/ VFR conditions to prevail through the terminal forecast period as high pressure settles across the region.
Post Tropical Cyclone Hermine continues to move northeast along the eastern seaboard. Very dry air aloft is in place over the area, courtesy of a strong upper level ridge extending south from the Great Lakes region into northern Alabama.
717 AM EDT SAT SEP 3 2016 High pressure centered over Southern Ontario will gradually shift eastward through the weekend.
At the surface light southeasterly winds were holding moisture in place with dewpoints in the lower to middle 60s common.
Upper level trof along west coast with a resultant downstream southwest flow aloft over Colorado. Further west towards the Front Range and mountains some of the low level moisture will mix out while in addition, the upper trof will approach a bit before max heating so weaker storms there and through the mountains. Temperatures will be warmer today.
In the mid/upper levels, the upper low associated with Tropical Storm Hermine sits over the mid-Atlantic region. Farther south and closer to home, mid level ridging extends from south of Bermuda westward over the Bahamas and the Florida peninsula. The predominant synoptic feature to influence the weather over Florida will be subtropical high pressure located near Bermuda and ridging westward.