Aikyam-Lab/Synoptic-Bench huggingface dataset:
536 PM CST Wed Nov 29 2017 At 3 PM, the southerly winds were increasing ahead of Pacific cold front over the central Dakotas. The cold front will move through the area after midnight tonight. The tight surface pressure gradient ahead and in the wake of this front will keep the boundary layer well mixed; thus, temperatures will be much warmer tonight than what they were this morning. Low temperatures on Thursday morning range from the lower to mid-30s. With the air mass being of Pacific origin in the wake of this cold front, there will be little difference from the high temperatures today (mainly in the mid and upper 40s) for Thursday afternoon.
A weak trough is moving into middle Tennessee. To the West weak ridging is building in from the west in the wake of the trough suppressing rain chances. As the ridge approaches middle Tennessee and the Alabame state line models have another round of light showers developing and moving across the region. Morning lows should fall into the low 50s. The closed upper low over the southern plains earlier today has opened into a trough that is now located over MS River Valley. The weakening upper trough will exit the region this evening. Lows will be in the lower 50s. A cold front will begin moving through late tonight through Thursday morning. Highs will be a bit cooler on Thursday but still quite mild for this time of year.
629 PM EST Wed Nov 29 2017 High pressure will prevail across the area through tonight. A weak cold front will approach Thursday and move into the area Thursday night.
654 PM EST Wed Nov 29 2017 High pressure builds over the forecast area tonight, bringing clearing skies, light winds and cold temperatures.
901 PM CST Wed Nov 29 2017 Closed low from earlier this morning across northeastern OK is slowly moving eastward and weakening this afternoon. A weak cold front currently across the Dakotas will move across the bi- state area late tonight and will try and serve as the focus for some isolated to widely scattered showers.
619 PM EST Wed Nov 29 2017 A cold front will bring cooler weather and showers to the region Thursday night.
Higher boundary layer moisture remains along the coast in the Coastal Bend where dewpoint temperatures were in the lower to mid 60s as winds shifted to easterly late this afternoon. Expect this higher boundary layer moisture will continue to move inland across the southern Coastal Bend and reach ALI area later this evening.
A digging trough over the upper midwest will send a weak cold front southward toward the area on Thursday. The highest rain chances will be across northern areas where the better mid and upper level forcing will be. Highs on Thursday will again be in the low to mid 70s.
622 PM EST Wed Nov 29 2017 Light SE wind will veer to southerly by morning and SW by mid- morning as a weak trough approaches from the west. Center of coherent midlevel anticyclone will pass over the Detroit Metro area between 21-00Z this evening. Low impact light rain event set to occur over southeastern Michigan Thursday morning as the next trough in what has become a steady wave train tracks directly through the Great Lakes.
CDFNT/Sfc Trof, trailing SWD fm the low, wl cont to move acrs AR, bringing a gradual wind shift fm SE to W/NW.
756 PM EST Wed Nov 29 2017 High pressure over the Northeast U. will build south along the east coast tonight ahead of a cold front that will cross the area on Thursday night. Seasonable temperatures are expected for the weekend as high pressure builds in from the northwest. A weak and dissipating cold front was sagging into NC this evening, with high pressure, now over the Ohio Valley building southward east of the Appalachian Mountains. For temperatures, used a combination of persistence with a blend of the MOS guidance, leaning toward the warmer highs on Thursday and the cooler lowers Wed night.
This front, along with an area of low pressure will begin impacting this CWA during the late morning hours with snow and breezy northwesterly winds.
A cold front is expected to move through deep south Texas later this evening and overnight resulting in a slight uptick in northerly winds and some low clouds. Another cold front is expected to move through deep south Texas by late this evening. Low temperatures tonight will range from the lower 40s across the ranchlands to the mid 50s at the beaches.
An upper level trough will move across the central part of the country today. As this trough moves to the east by this evening, a reinforcing surge of cooler will settle into South Texas tonight.
Mid and high clouds continue to flow over the northern periphery of the high pressure system just off the West Coast.
427 AM CST Sun Dec 24 2017 (Today and Tonight) Brisk north-northeast winds and colder temperatures are expected in the wake of a strong cold frontal passage today. Overnight lows are expected to be in the 20s (mostly in the lower to mid 20s), with the colder readings in the favored low- lying areas and along river valleys. The broad upper trough across the eastern US will weaken and shift a little east, with flow becoming more zonal across west Texas through the middle of the week, with increasing moisture.
Light freezing drizzle is occurring across far northwest Arkansas and portions of northeast Oklahoma with visibility falling below 2 miles. Temperatures are expected to stay above freezing at KFYV/KMLC/KFSM so only drizzle is forecast. /Issued 346 AM CST Sun Dec 24 2017/ Cold front, currently located near Interstate 44, will sweep south through southeast Oklahoma and northwest Arkansas by noon with gusty north winds behind the front. Patchy freezing drizzle will be possible through mid morning, which could create a few slick spots mainly north of Highway 412 through mid morning.
A strong cold front will sweep across west Texas and southeastern New Mexico this morning, making it to KHOB and KMAF around 15Z, KINK and KPEQ around 16Z, and KCNM and KFST around 17Z. /issued 337 AM CST Sun Dec 24 2017/ Currently we have westerly winds across the region, keeping overnight temperatures much warmer than what we saw yesterday morning. Winds will begin to shift to the north/northeast later this morning as the next cold front moves through.
Temperatures have dipped into the lower 30s in a few spots but mainly mid 30 to low 40s prevailing. Cold front passing through the Oklahoma City area at 4 am. Cold front will race southward today reaching into the CLL area around noon-1pm and the coast 4-5 pm. High pressure builds in tonight making for great flying weather across SETX for Santa and then Sunday the high pressure system shifts off to the east. Christmas day should dawn mostly sunny and chilly and then by late afternoon clouds should begin to increase as high pressure retreats. Low level flow becomes southeasterly near the coast with a coastal trough evolving into a warm front creeping into the area overnight.
517 AM CST Sun Dec 24 2017 /12Z TAFS/ The main aviation weather concern is with the gusty north winds expected after a cold frontal passage this morning. /issued 427 AM CST Sun Dec 24 2017/ (Today and Tonight) Brisk north-northeast winds and colder temperatures are expected in the wake of a strong cold frontal passage today. Overnight lows are expected to be in the 20s (mostly in the lower to mid 20s), with the colder readings in the favored low- lying areas and along river valleys. The broad upper trough across the eastern US will weaken and shift a little east, with flow becoming more zonal across west Texas through the middle of the week, with increasing moisture.
This morning there could be a little freezing rain or sleet in central Oregon before temperatures climb slightly above freezing this afternoon.
1055 AM EST Sun Dec 24 2017 Update Low pressure moving through the Ohio Valley will bring snow to Lower Michigan today, then arctic air will bring cold temperatures and lake effect snow showers through much of this week.
618 AM CST Sun Dec 24 2017 A cold front is slowly sagging south across the forecast area this morning, accompanied by increased cloud cover and snow showers. Aloft, we have an east-west oriented baroclinic zone at 850mb, draped across northern Minnesota, that is along the southern flanks of a large upper level trough over Hudson Bay.
550 AM CST Sun Dec 24 2017 A cold front will sweep through our area today, with passage at KAUS at 17Z, KSAT at 18Z, and KDRT/KSSF at 19Z. Temperatures have dropped into the lower 30s to near 40 degrees under these conditions. A trough axis is passing through the plains and is bringing a Christmas Eve snow to the Central Plains and Midwest today. For us, this trough axis will send a dry frontal passage into the area late this morning and early this afternoon. This will allow temperatures to fall to or below freezing for the Hill Country and locations north of a San Marcos to La Grange line.
Winds along the ridges may increase slightly with locally breezy conditions in the hills/ridges in wake of the frontal passage this evening into Christmas morning. Temperatures on Christmas Day will actually be warmer than those this afternoon as mid/high level clouds clear from north to south. High pressure will then build back over the eastern Pacific and California through the remainder of the week. This will allow for temperatures to warm potentially into the lower 70s for inland areas of the Central Coast by late week with lower 60s most likely to persist over the greater San Francisco Bay Area. Longer range models show the ridge weakening slightly and retrograding toward the end of the year. This would allow for cooler systems to drop in from the north/northwest and perhaps bring rainfall to portions of Northern California.
Christmas Day will have sunny skies and high temperatures in the low 50s.
Pressure falls in eastern Montana just now getting going as a low pressure system in Canada slides eastward.
Arctic high pressure building in behind the snow system will entrench itself across our region for the entire week. As the upper trough continues to amplify as it moves into Indiana. In these southern counties ground temperatures should be above freezing until late afternoon so roads will become mainly slushy. Temperatures will remain below freezing today along and north of the I-70 corridor while locations south of there will reach the mid 30s before falling back to freezing before sundown.
647 AM EST Sun Dec 24 2017 Aviation Low pressure moving through the Ohio Valley will bring snow to Lower Michigan today, then arctic air will bring cold temperatures and lake effect snow showers through much of this week.
High pressure over California has begun to weaken as a very high- amplitude frontal system approaches the West Coast. High clouds have been spilling over the ridge over the last day or so, and Doppler radar has been picking up on virga across far northern CA. This high cloud cover has also helped to mitigate radiational cooling, as temperatures are in the upper 30s to lower 40s across the Valley at this hour. The aforentioned trough will move inland today and tonight, weakening and eventually splitting as it does. The upper ridge will rebuild starting Monday with dry weather continuing through the rest of the week.
Occasional high clouds can be expected through the week, though high pressure will generally prevail, resulting in a continuation of the relatively warm conditions. Temperatures this morning across the area are running a few degrees warmer than those observed 24 hours ago, owing to the influence of increasing thicknesses along with areas of high clouds spilling over the eastern Pacific ridge.
800 AM EST Sun Dec 24 2017 Marine Low pressure moving through the Ohio Valley will bring snow to Lower Michigan today, then arctic air will bring cold temperatures and lake effect snow showers through much of this week.
A cold front will pass through in the evening, shifting winds to a more W-NW direction with gusts in the 20-30 kt range.
Otherwise cold frontal boundary with scattered showers across inland SE GA will continue to slowly drift SE through the region while weakening with lesser shower activity as it reaches coastal NE FL by evening. Partial clearing expected overnight as cold front settles south of the region with much cooler temps in the 40s/lower 50s by early Monday Morning.
502 AM MST Sun Dec 24 2017 12Z TAF CYCLE A gusty back door cold front will finish plunging southward through the eastern plains this morning. A cold front moving south across eastern New Mexico will lower high temperatures into the 30s and 40s today. Much warmer temperatures are in store for Christmas Day with readings 10 to 15 degrees above normal for the entire area. A couple snow showers are possible over the high terrain near the Colorado border.
May have to expand fog coverage, but holding off for now, in case the pressure gradient increases faster than models expect ahead of the cold front approaching Tennessee from the northwest. The good news is that it should be very isolated, so no accumulation is expected, even though temperatures will be below freezing in Southern Middle Tennessee after midnight. Lows by daybreak on Monday should be in the lower to mid 20s. As a strong area of high pressure originating from Canada settles southeastward over Arkansas and Louisiana, highs will only climb into the upper 30s in most locations. As this high shifts east and settles over the Tennessee Valley on Monday night, southwest flow near the surface returns as zonal flow aloft develops ahead of another piece of energy rotating around the main upper low over south central Canada.
536 AM CST Sun Dec 24 2017 MVFR conditions are expected at all terminals this morning behind a cold front moving south through the area. This cold front will shift surface winds to the north-northeast with sustained winds around 18-24kt. There is potential that high clouds over the area could keep the low ceilings around longer than expected. /issued 318 AM CST Sun Dec 24 2017/ Low pressure over Hudson Bay will remain quite predominant in the NAmer weather pattern. High amplitude ridging from California all the way to Santaland at 90N is noted. A disturbance in the mean flow is passing to our north today which is driving a cold front through the region this morning.
Temperatures will climb into the 60s across the lowlands by the afternoon. Temperatures will be a little cooler in the week ahead, but will remain in the 60s for the lowlands. This won't have much impact on the expected warming trend, with maximum temperatures still expected to be in the 60s across the lowlands. High pressure settling over the Great Plains in the afternoon will try to push a backdoor cold front in our direction, but it is rather shallow, and while winds will go easterly by Christmas morning over areas near and east of the Rio Grande, winds at 850mb will be out of the south (a sign of just how shallow the cooler airmass is). Temperatures look to flirt with the lower 70s in the lowlands for Christmas Day.
/issued 314 AM EST Sun Dec 24 2017/ Synopsis and near term (early this morning): The synoptic pattern this morning is characterized by a low amplitude longwave trough in the middle and upper atmosphere over the CONUS. At the surface, a cold front extends from off the New England Coast to the North Carolina Outer Banks, across Georgia and into the central Gulf. Short Term (today through Christmas Day): After patchy morning fog dissipates, should be another very nice day with high pressure and a dry air mass remaining in place. Highs will be a bit cooler Monday over the Lake Okeechobee region behind the weakening front.
The coldest values as of 3AM MST, are -33F in Polebridge and -26F in Butte. Widespread accumulations of 3 to 6 inches of snow for the lower valleys is likely. Northwestern Montana will largely miss out of the higher snow amounts, though periods of light snow is possible.
623 AM EST Sun Dec 24 2017 [Through 12z Monday] A cold front will continue to move through the region with mainly MVFR to IFR ceilings through the morning hours. A thin line of light to moderate showers will continue to move across the eastern half of the area today along a cold front.
A cold front is slowly sagging south across the forecast area this morning, accompanied by increased cloud cover and snow showers. Aloft, we have an east-west oriented baroclinic zone at 850mb, draped across northern Minnesota, that is along the southern flanks of a large upper level trough over Hudson Bay.
Winds become light this evening with high pressure overhead. The upper low just sitting over Ontario places Nebraska in northwest flow, giving periodic precip chances and keeping temperatures below normal.
This high altitude moisture is rounding the top of an upper level ridge of high pressure that will remain anchored off the coast of northern Baja through at least Christmas Day. Conditions may not improve much over the higher elevations of Kern county tonight so there is a possibility that the Red Flag Warning may have to be extended. In the broader picture, the models forecast a couple of weak disturbances to ride over the top of the upper level ridge. While this feature could brush the Sierra crest with a few snow showers, hopes for a whiter Christmas over the sierra ridgetops look pretty bleak.
Another cold front is expected to move through deep south Texas by late this evening. Low temperatures tonight will range from the lower 40s across the ranchlands to the mid 50s at the beaches.
Ridgetop winds will remain strong (40 mph gusts common), with a little wave amplification producing gusts up to 60 mph over the Front Range this morning.
Aloft today, we will remain in southwesterly flow with the main upper low/trough axis not making its way through west Texas until tonight. This evening as the surface front increases convergence in our southeastern counties, and the main trough approaches, showers and thunderstorms are expected to develop, mainly east of a Clyde to Coleman to Junction line. A Canadian cold front will move into the northern half of the CWA late tonight into Thursday morning.
524 AM CST Wed Feb 28 2018 A warm/humid day is expected across SE TX today as we await the arrival of the next cold front late tonight/early Thurs morning. The bulk of the activity associated with this system will likely be concentrated along the front (or prefront- al trough) itself. Rain chances should continue through Mon/Mon night as the next cold front be- gins to trek down from the Southern Plains. Gradient remains tight this afternoon through 6 am then relaxes as the cold front nears the coast. Showers and thunderstorms possible Thursday morning with the cold front.
Shower activity is expected to gradually decrease and become more focused over the higher terrain through late morning and into the afternoon. For Thursday, an upper level low pressure system along the west coast will place western Montana and central Idaho under southwest flow aloft. This will bring a relatively warm airmass over the region, briefly raising snow levels and warming many valley locations into the low to mid 40s. However, the warmer temperatures should bring primarily a rain or rain snow mix to valley locations.
1002 AM EST Wed Feb 28 2018 Warm front advances into the region by tonight with rain. Cold front passes Thursday night.
By this aftn, overall areal coverage wl cont to incrs over the entire FA, as the main upr trof apchs AR fm the Srn Plains. Rain chances wl finally diminish fm the NW later tngt and Thu morning as the cold front moves out of the area. High pressure wl then bld in for the rest of the PD with much drier and somewhat cooler airmass.
It will remain mild otherwise with early morning lows in the 40s and highs later today in the low to mid 50s. A strengthening low pressure system will provide a soaking rain Wednesday night into Thursday.
light to moderate showers will continue to move into portions of the forecast area through the morning and into the afternoon hours as a warm front pushes north.
401 AM CST Wed Feb 28 2018 A flat upper level ridge was over the area. Water vapor loop indicated an upper level trough over eastern MT. Upper trough will amplify as it moves across the area today and tonight. A weak cold front/wind shift was located over northwest ND.
Rapid moving feature will advance east through the southern plains today and through the lower Mississippi valley Thursday advancing a cold front across the forecast area Thursday morning. Remainder of the week looks dry and as previously mentioned cooler as an amplifying ridge settles over the central CONUS between bookend trofs/lows.
A cold front is then expected late this evening swinging winds around to a northerly direction. /issued 327 AM CST Wed Feb 28 2018/ The closed upper level low over southern California will open as it approaches west Texas today. Onset of winds with the approaching trough is also delayed a few hours with the highest speeds expected around 0Z. As the upper trough approaches the front will push through with winds shifting to the north around 06Z. Temperatures Thursday will be around 5-10 degrees cooler than today.
A cold front will sweep across the area overnight tonight, and a narrow line of showers and storms may eventually develop along the front.
900 AM EST Wed Feb 28 2018 A weak frontal boundary will continue to slowly wash out today over the northern Florida Keys, as high pressure over the Gulf of Mexico builds back east into the Florida Peninsula. The weather should remain dry today over the taf sites along with VFR conditions, as high pressure over the Gulf of Mexico shift east into the Florida Peninsula. Mid level ridge centered over the Gulf of MX will gradually shift e keeping control of South Florida and providing a benign weather pattern through the end of the week. By Thursday winds shifting s to sw will allow temps to be much warmer across the interior and east coast metro areas.
655 AM CST Wed Feb 28 2018 Early this morning the warm front has just about moved North out of the forecast area with some patchy fog near and just ahead of the boundary and returns on radar indicated light rain over parts of Southeast Oklahoma. In the Southwest flow aloft between the trough to the west and ridge aloft in the gulf supplying pacific moisture and low level flow continued to supply low level moisture. Lower and mid level flow becomes parallel with weak surface boundary and instability increases across the region ahead of approaching cold front.
Southwesterly low level moisture fetch will continue across the PAH forecast area early today as a surface warm front strengthens over AR. Thus, the low will pass just to our north, across northern IL/IN, bringing a surface cold front toward our region. Isolated tstms are possible north of I-64 in close proximity to the low. Meanwhile, it appears that the low level moist fetch over us will switch direction to more westerly, which will tend to keep the best moisture convergence and cross-frontal flow along the temporarily stalled frontal boundary across AR/TN. Mild temps will continue in the short term ahead of the cold front.
533 AM EST Wed Feb 28 2018 Approaching low pressure will bring rain tonight and Thursday.
412 AM MST Wed Feb 28 2018 Weak upper trof swinging across Montana this morning will be followed by a building upper ridge through the end of the week. Driver for the building upper ridge is a strong upper low dropping out of the Gulf of Alaska along the Canadian west coast.
High pressure will ridge across the area through the period. The high pressure center over the mid-Atlantic states this morning will shift east over the Atlantic through tonight with the ridge axis across the state then pushing south for Thursday as a cold front pushes into the deep south. The upper high sits over western Cuba with associated ridging extending from the Bahamas westward through the Gulf of Mexico into eastern Mexico. Farther north, an upper low sits over the southern Great Lakes region with troughing extending south through Tennessee.
/issued 344 AM CST Wed Feb 28 2018/ Strong upper low moving over Srn CA to AZ this morning will open up into a trough as it swings east passing over NM early evening into TX by midnight and OK by Thursday morning. Weak high pressure builds in behind the trough.