Aikyam-Lab/Synoptic-Bench huggingface dataset:
327 PM EST Tue Dec 6 2016 Aviation section updated High pressure will strengthen at the surface over Central Indiana as low pressure pushes farther east.
Northwest upper-level flow and a ridge of high pressure in the eastern Pacific will keep the area dry and slightly warmer than average today. A cold front will move through the area tonight and Wednesday bringing breezy conditions to the Colorado River Valley and cooler temperatures area wide.
228 PM EST Tue Dec 6 2016 A weakening trough is moving off the East Coast States with the trailing shear zone crossing central Florida. A large upper level low is drifting eastward over the far western Great Lakes while cold Artic air is moving southward over the Pacific Northwest. The weak shear zone / trough over central Florida have been producing showers and some thunderstorms, but these have been waning this afternoon.
The front is expected to stall early Wednesday morning just east of the offshore waters and move back toward the coast as a warm front but still be over the Gulf waters through Wednesday evening.
As for temperatures, highs today look to range from the lower 30s across northwest Kansas to lower 40s across south central Kansas. This system will also help push through a cold front Wednesday with northerly winds and a much colder air mass behind it. Temperatures Wednesday look to range from the lower 20s across northwest Kansas to lower 30s across south central Kansas.
With the ridge of high pressure across the area winds will be mostly from the northwest, but should decrease as the day goes on. Tonight, the high pressure gets pushed to the east as an upper level wave moves into the area from the west. models continue to focus the brunt of this system across the high plains and extending into Kansas.
A cold front is pushing its way through eastern Wisconsin at the moment with a brief band of drizzle/light snow ahead of it.
/Tonight through Wednesday/ A strong cold front that move through central Iowa early this morning has now pushed east of the Mississippi River and has left colder and much drier air in its wake. Deep low pressure over far northwest Minnesota has brought broad cyclonic flow to Iowa. The mixed conditions will also keep temperatures from dropping significantly overnight with overnight lows in the low teens northwest to low 20s southeast. Shallow cumulus development may occur though deep layer subsidence will be in place with a weak high pressure ridge over the state.
Observations have shown much of the precipitation to be falling as snow, with some light rain/drizzle/freezing drizzle along the leading edge of the precip. Winds will become gusty from the west following the cold frontal passage with daytime highs likely to be this morning.
1018 AM CST Tue Dec 6 2016 Shallow cold front is advancing south into the northern Hill Country and Central Texas late this morning, with a pre-frontal wind shift occurring farther south through the remainder of the CWA.
Southeasterly flow on the east side of the low caused temperatures to spike into the mid to upper 50s over areas south of I-40 and east of I-65 over the last few hours. The low has since moved just to the northeast of Middle Tennessee and winds have begun to shift from southeasterly to northwesterly. As the low continues to move off to the northeast today, temperatures are expected to slowly fall from west to east.
1145 AM EST Tue Dec 6 2016 Rain will spread across the forecast area today as low pressure tracks across SE Ohio. The low will track east of the area overnight and dissipate.
Cooler temperatures invading behind cold front. The main impact for tonight will be the low clouds that may drop further (towards 1000 feet) which could create a visibility issue with fog over the higher elevations of northeast AL/southern middle TN. Low dewpoint depressions in the low-levels may also be an ingredient for the fog. Then, on Wednesday, as has been mentioned in previous forecasts, the broad trough originating from the Pacific Northwest will move towards the central Plains. This trough is sending an Arctic cold front over much of the country including the Midwest today and approaching the TN Valley on Wednesday afternoon. Ahead of this front, enough saturation in the low-mid levels will be present to support the development of light rain over the TN Valley.
Next surge of colder air along an arctic cold front will move into our northern counties this afternoon. Snowfall will likely be enhanced along the baroclinic band of the arctic cold front.
This afternoon's satellite images showed a deep upper level trough nearly stationary and continuing to spin over the Western Great Lakes region. Closer to the surface, a cold front ahead of the main low pressure system kicked off an area of precipitation this morning that slowly pushed eastward this afternoon. Much colder air has already begun to filter into the state behind the cold front.
1113 AM MST Tue Dec 6 2016 Current surface analysis shows strong area of low pressure centered over far northeast ND, with secondary arctic front stretching southwest to southwest SD and into northern WY. Upper level analysis shows the low over northern MN. Upper level analysis has closed low over eastern ND, with broad trof across the northwestern and north central CONUS. At the surface, deep low pressure is located across northwest MN with arctic high centered over western MT.
A cold front moving through the area has resulted in cooler temperatures today with highs only expected to be in the 40s across the northern half of the Permian Basin and into southeast New Mexico. In advance of the cold front on Wednesday, surface winds will become southwesterly then westerly allowing for compressional warming resulting in temperatures warming up into the 60s for much of the area. The cold front is expected to begin moving into the CWA Wednesday evening with brisk northeast winds behind it.
Cold air will wrap around the low as it lifts out resulting in scattered to numerous snow showers through mid-week and falling surface temperatures. Breezy winds today and tomorrow as the low lifts out resulting in wind chill values below zero in some spots. ) Colder Wednesday with highs in the low to mid 20s. A broad trough will be across the region that will be left over from the strong closed low that has been keeping the northland in clouds and snow.
352 PM CST Tue Dec 6 2016 (Today and Tonight) Low clouds and patchy drizzle have continued on and off today across much of the area behind a cold front. we are seeing drier air move in at the lower levels. As cold air advection continues in the low levels. the warmer temperatures will be brief as a strong arctic front begins to approach the area later Wednesday. Cold air is still one the way with wintry precipitation By Wednesday night, an arctic cold front will be moving through the area.
mostly in the low 50s. 09z H5 analysis reveals an upper level low embedded in southwesterly flow located over northeast Louisiana, with ample moisture present locally. Surface temperatures range from the lower 40s across northeast Arkansas this hour to the upper 50s across portions of northeast Mississippi. A strong, but fairly dry, cold front will push into the region on Wednesday night, accompanied by limited overrunning moisture. Temperatures will drop in earnest, with Wednesday night lows in the upper 20s to near 30s over the northern half of the FA and in the low to mid 30s over the southern half.
With the low over North Dakota, winds will continue to be breezy across eastern Montana.
1004 AM CST Tue Dec 6 2016 Blizzard warning now in effect across the all of eastern ND minus Sargent, Ransom and Richland counties as winds are slowing increasing with the center of the low pressure system now between Thief River Falls and Roseau. Main concern will be the high impact winter storm/blizzard ongoing or developing. Strong upper low.
Cooler and drier air will be over Western Washington through Wednesday and there will be Fraser River outflow in the north.
Some slight clearing along with north winds pulling cooler air into the region will allow for low temperatures to fall to near average early December averages.
414 PM EST Tue Dec 6 2016 A low pressure system will exit the area tonight. High pressure will work into the area for Wednesday.
The closed low moves slowly east and moves an upper trough into the upper Great Lakes this afternoon and tonight with the low ending up near Thunder Bay Ontario by 12z Wed. Used the prob ice present to depict snow and a narrow band moves through the cwa today with the cold front. Out ahead of the cold front, removed snow out of the forecast and went with drizzle, freezing drizzle and rain showers based on temperatures. If the low develops, snow will likely move into the Keweenaw very early on Wed (possibly even before 12Z) and may be very heavy. Set headline start times to match best expectation for when the trough moves in, but adjustments may need to be made.
913 AM PST Tue Dec 6 2016 A low pressure system moving from the Pacific Northwest into the Great Basin will bring stronger onshore flow across Southern California through tonight with more clouds and with gusty west winds in the mountains and deserts.
A cold front southeast of a CLL-SAT line will move southeast this afternoon. Cold front over central Texas continues to advance southward this morning. The cold front has already passed the I-35 corridor and should reach northern counties of the CWA by mid afternoon. Went with a blend of the 00Z Hi-Res ARW and 09Z SREF models for timing of the cold front moving through the coastal waters this evening. Frontal boundary is expected to stall just east of the offshore waters tonight and move back toward the coast as a warm front on Wednesday. Made changes to timing of the cold front moving into the region this evening. Front is expected to stall east of the offshore waters early Wednesday morning and move back into the marine areas as a warm front in the afternoon.
/issued 1112 AM CST Tue Dec 6 2016/ Water vapor imagery shows a board trough over the continental US this morning, with a couple of disturbances moving through the primarily westerly flow aloft.
238 PM CST Tue Dec 6 2016 An upper level trough is currently spreading east across the southwestern CONUS. The trough will continue to spread east into the Plains late tonight into Wednesday then across the area Wednesday night. A cold front will sweep across the area late Wednesday afternoon into Wednesday night. Temperatures will be similar to those today as they warm into the upper 30s to the lower 40s ahead of the front. Lift will start to overspread the area ahead of the trough during the day Wednesday. Temperatures will be above freezing during this time. As the front and trough approach from the west late Wednesday afternoon/early evening, stronger lift will develop in a band with the front across southeastern Kansas into western MO.
Mid afternoon temperatures were in the low/mid 50s with west to northwest winds 5-15 mph. A mostly cloudy and somewhat cooler trend is expected for the mid week as the first surge of cooler air filters in from the northwest.
146 PM EST Tue Dec 6 2016 A warm front will lift north through the area this morning, then a cold front will sweep through this afternoon.
This band is occurring in the deformation zone of the upper low currently moving south of the area. This band of the rain will move quickly out of the area this morning as the upper low lifts into the Ohio Valley. High pressure will move into the area tonight, but clouds will begin to move back in ahead of the next system.
Relatively clear and cooler conditions tonight with a brisk wind persisting, although not nearly strong as the daytime velocities.
251 PM CST Tue Dec 6 2016 Cold high pressure was located over the central plains this afternoon with low pressure over northern Minnesota.
1145 AM CST Tue Dec 6 2016 A cold front is approaching AUS and will bring MVFR CIG within the next hour or two. /ISSUED 1018 AM CST Tue Dec 6 2016/ Shallow cold front is advancing south into the northern Hill Country and Central Texas late this morning, with a pre-frontal wind shift occurring farther south through the remainder of the CWA.
443 PM EST Tue Dec 6 2016 After system departs tonight, high pressure will build for Wednesday.
A southwesterly flow at mid levels persists over the forecast area as an upper trof advances slowly across the central/northern Plains.
334 PM EST Tue Dec 6 2016 Low pressure moving through will continue to bring a mix of precipitation through central Pennsylvania this afternoon and evening.
With temps being below freezing in northeast areas currently, the slight chance of freezing rain is still warranted, so will be leaving it in the wx grids. The remainder of today through tonight will be dry as the weather system quickly moves east and a high pressure ridge builds into the area tonight from the west. Skies should scatter out and then clear tonight as the ridge moves in. Clear skies and high pressure building in will cause temps to drop well below freezing, reaching the lower to mid 20s across the area. Cold Arctic air makes its way into the region and by Wednesday, most areas north of Interstate 70 have high temperatures at or below freezing.
The upper level trough axis has now shifted east of the area, and the last remaining areas of sprinkles are also quickly exiting the area this afternoon. Have included patchy fog wording across the higher elevations in the northeast due to cloud decks that could be low enough to appear as fog.
311 PM CST Tue Dec 6 2016 High pressure ridging will build into the area tonight and Wednesday. Clearing line will make its way across the remainder of the forecast area this evening in the wake of a cold front pushing through the Midwest. The combination of the incoming cloudiness, dry air advecting in with the ridge, and winds remaining up around 5 kts should reduce the potential for fog tonight and keep temps mostly in the 20s overnight.
To our northwest, a cold front is pushing southeast through northern Missouri and central Kansas, and will sweep across the area this morning. With high pressure building south and winds settling down tonight, overnight lows should drop into the mid 20s by early Wednesday morning. A broad upper level trough will be carved out from the northern Rockies into the Great Lakes. Short wave energy will translate east along the southern flank of this trough across the central Plains into the Missouri Ozarks from Wednesday into Wednesday night. In the lower levels of the atmosphere, another cold front will pass through the region during the day on Wednesday.
Just a quick update with the previous winter weather advisories for the Lower Columbia Basin, Washington Blue Mountain Foothills, North Central Oregon and the John Day Basin expiring at 10 AM. The upper level trough over the region is gradually moving into Idaho leaving eastern WA/OR under a N-NW flow aloft. skies will clear overnight but could see some patchy freezing fog overnight and early Wednesday.
This moderate snowfall is combining with the high winds to limit visibility, to near zero at times.
An area of low pressure will move from the Tennessee Valley into the Upper Ohio Valley today, bringing rain to much of central Indiana. Current temps across the area are ranging from the low 30s to upper 30s. Highs are expected to top off in the low to mid 40s. (A cold front will also move through this afternoon, but it won't have much forcing or moisture to work with.
A cold front moving through the state will displace some of the MVFR ceilings, especially from northern Arkansas, but will not completely change the air mass.
For the lower elevations. With clouds the mountain valleys will be warmer.
High pressure will ridge in from the west during the day Wednesday, under partly cloudy skies, with more upper clouds all from making us sunny. Wednesday night cloud cover will increase again as a reinforcing cold front approaches. Reinforcing cold shot moving in Wednesday will allow Arctic high pressure to spill southward into our region.
200 PM PST Tue Dec 6 2016 A low pressure system moving from the Pacific Northwest into the Great Basin will bring stronger onshore flow across Southern California tonight with more clouds and gusty west winds in the mountains and deserts.
/issued 420 AM CST Tue Dec 6 2016/ The first of two cold fronts has made it through the CWFA with chilly and gusty winds in its wake. However, an impressive and quite wide trough is positioned to our north with a parent low up near Lake Superior.
1123 AM CST Tue Dec 6 2016 Early morning water vapor imagery shows potent closed low rotating northeast over eastern North Dakota with trailing trough extending into western Nebraska. This system has allowed a strong cold front to drop southeast across the region followed by gusty northwest winds.
Cold front over central Texas continues to advance southward this morning. The cold front has already passed the I-35 corridor and should reach northern counties of the CWA by mid afternoon. Went with a blend of the 00Z Hi-Res ARW and 09Z SREF models for timing of the cold front moving through the coastal waters this evening. Frontal boundary is expected to stall just east of the offshore waters tonight and move back toward the coast as a warm front on Wednesday. Made changes to timing of the cold front moving into the region this evening. Front is expected to stall east of the offshore waters early Wednesday morning and move back into the marine areas as a warm front in the afternoon.
With the cold airmass placing the low stratus well into the dendritic layer, expect some isolated light snow or flurries to develop north of I90, with the best potential in the highway 14 corridor. Tonight, stratus starts lifting northward, but secondary trough digs into Nebraska overnight, bringing some additional cloud cover towards daybreak.
Gusty north winds behind a cold front will subside today and gradually veer around to easterly and eventually southeasterly. /issued 333 AM CST Tue Dec 6 2016/ Latest surface observations indicate a cold front oriented northeast to southwest across the forecast area early this morning. This cold front is progressing southward and will move through the entire area by mid morning. Ahead of the cold front, low level moisture has been sufficient for low stratus and fog. Temperatures will be cooler today. The much colder arctic air mass is now flowing into the northern Great Plains and will continue to move south behind a second stronger cold front.
1142 AM CST Sun Dec 11 2016 Warm advection and cloud cover has kept temperatures from falling much, if at all, tonight and latest surface observations are showing temperatures near or at freezing across northern Missouri. With temperatures expected to continue to rise early this morning, the threat of freezing drizzle is decreasing and may only be confined to localized areas in far northern Missouri for a few hours around sunrise. So forecast soundings continue indicate any precipitation will likely be drizzle or freezing drizzle.
145 PM CST Sun Dec 11 2016 Scattered showers will only be on the increase heading into the evening hours, as the atmospheric column more fully saturates in advance of an approaching cold front. The cold front will reach our northwest doorstep by around 03Z, be on the Ohio River/crossing around 06z, and make its final push east of the Lakes and out the FA between 09-12Z. After the front's departure, High pressure will work in overhead, literally.
1150 AM CST Sun Dec 11 2016 For the 18Z TAFs, a cold front has moved through all TAF sites as of this writing with north winds, gusty at times, in its wake. Expect winds to diminish by sunset, then become southwest by sunrise Monday as a surface trof of low pressure redevelops along the ern slopes of the Rockies. Winds will swing northerly behind a cold front and be fairly breezy. /Issued 420 AM CST Sun Dec 11 2016/ First cold front expected to arrive today, but high temperatures today are still expected to top out at above-normal readings as colder airmass remains north of Texas and Oklahoma Panhandles.
Easterly winds this afternoon veer to the south tonight ahead of the cold front. While areas of fog are expected after midnight, the lower visibilities may hold off until early in the morning and continue after 12z. With the southerly flow and cloudy skies overnight, low temperatures will be significantly warmer than this morning (around 15 degrees warmer). This will result in lows in the lower 50s inland to mid 50s across the Florida panhandle and upper 50s to lower 60s along the coast. Near sunrise, with the fog and low clouds, may also see some drizzle associated with the low clouds.
Tomorrow, a more amplified trough will begin to dig from Canada into the Northern Plains. Several of the models have some very light precip developing along the cold front, mostly over the southern counties.
1110 AM CST Sun Dec 11 2016 Water vapor imagery shows predominately zonal flow over the Lower 48 this morning. Given the lower dew points earlier this morning. another surge of cooler air will push back into the region for mid week.
On Monday, next cold front will be moving through the region and have continued the trend of previous forecasts by increasing wind speeds above that of SuperBlend for Monday afternoon.
The cold front extended from near Cherokee to Cheyenne at 1030 a. , with somewhat cooler and breezy conditions behind it. /issued 500 AM CST Sun Dec 11 2016/ lower MVFR and some IFR ceilings will linger through much of the morning before moisture shifts east and cold front moves through. Afore mentioned cold front will move from northwest to southeast across the area today with associated wind shift. Otherwise, a cold front will enter northwest Oklahoma shortly after sunrise and move quickly southeast across Oklahoma into north Texas during the day today.
ahead of a cold front. Cloudy and breezy conditions continue ahead of a cold front that was currently pushing through northwest OK. Winds will diminish some with the approach of the cold front.
317 PM CST Sun Dec 11 2016 Gusty southwest winds ahead of a cold front has allowed skies to become partly cloudy across a good portion of North Texas this afternoon. a cold front was moving through Oklahoma and is now just northwest of Wichita Falls. indications are that moisture will be lifted over the shallow cooler air by morning. Highs on Monday will range from the lower 50s near the Red River to the lower 60s across our southern counties.
Low pressure and an accompanying cold front advancing across the south plains will result in a tightening pressure gradient across the region today. /issued 459 AM CST Sun Dec 11 2016/ High pressure is exiting off the mid Atlantic states this morning as our next system has dropped down the eastern slopes of the Rockies and into Kansas. Winds have become southeast and this is why mrng temps are running about 10 degrees warmer than yesterday.
In the middle and upper levels, (700-200 mb), Latest available IR imagery overlaid with model streamline analysis as of 200 pm continues to depict a rather expansive low amplitude long wave polar trough positioned across the entire northern two thirds of the CONUS. Well to the south of that feature, the center of a deep and warm anticyclone is located just south of Haiti. At the surface and in the lower to middle levels, (Surface to 700 mb), latest available IR imagery as of 200 pm, overlaid with marine and land surface observations and analysis, detail the 1032 mb axis of an arctic surface anticyclone has migrated off of the East Coast and is aligned from Southern New England to east of Caper Hatteras NC.
Isentropic lift in the 295-300K layer will maintain a marginal threat for showers over the coastal plains for the rest of the morning with lift associated with low level warm air advection with the low level jet shifting to the east this afternoon and linger over the Victoria Crossroads.