Aikyam-Lab/Synoptic-Bench huggingface dataset:
937 PM EST Sun Dec 27 2020 Temperatures near to slightly above normal and dry conditions as upper ridging builds back into the region through early week.
The mid-level ridge will maintain in place tonight and gradually move eastward tomorrow morning into tomorrow night. Lows tonight will range from the mid 50s to upper 60s with minimum temperatures tomorrow warming into the lower to mid 60s across South Texas.
532 PM CST Sun Dec 27 2020 A cold front will trigger widely scattered showers across central Illinois early this evening before colder and drier weather arrives tonight into Monday. 21z/3pm surface analysis shows a 1003mb low over northern Illinois with a cold front trailing southwestward along the Illinois River. The airmass ahead of the front is quite dry: however, gradual boundary layer moistening has been occurring as evidenced by dewpoints climbing into the lower 40s east of the I-55 corridor late this afternoon.
530 PM CST Sun Dec 27 2020 Tonight through Monday night focus remains on the upper low moving inland across southern California tonight.
Short term models including Convective Allowing Model solutions (CAMs) indicate the development of showers along a cold front that will drop into the Mid-South later this evening into Monday morning. The cold front will drop south of the area Monday with cooler air filtering in behind the front.
Mid level embedded short wave trough and associated sfc cold front diving south into the Northern Plains tonight. A cold front will deliver cold temperatures early Monday morning in the single digits below zero north to single digits above zero south. Warmer southwest where highs nearing 30 are possible.
301 PM CST Sun Dec 27 2020 A cold front will deliver cold temperatures early Monday morning in the single digits below zero north to single digits above zero south. Warmer southwest where highs nearing 30 are possible.
As the aformentioned trough continues to approach the west CONUS coast, moisture south of the system continues to be advected into our region.
Highs look to range from the 20s in the northeast to a little above freezing southwest of Fort Peck Lake.
/issued 238 PM EST Sun Dec 27 2020/ High pressure is in place across the region. The high pressure center will shift off to the NE tonight and get reinforced from the north Monday night, keeping a general NE/E flow in place across the area.
828 PM CST Sun Dec 27 2020 A cold front will trigger widely scattered showers across central Illinois early this evening before colder and drier weather arrives tonight into Monday. Temperatures are falling fairly quickly from 50s ahead of the front into the low to mid 30s behind the front with northwest winds gusting 20 to 30 mph. 21z/3pm surface analysis shows a 1003mb low over northern Illinois with a cold front trailing southwestward along the Illinois River. The airmass ahead of the front is quite dry: however, gradual boundary layer moistening has been occurring as evidenced by dewpoints climbing into the lower 40s east of the I-55 corridor late this afternoon.
442 PM EST Sun Dec 27 2020 A cold front will move through toward daybreak Monday spreading light showers before turning to snow showers at the Monday night.
522 PM CST Sun Dec 27 2020 00Z TAF issuance A weak cold front will continue to cross the terminals this evening with winds becoming east but staying very light. /issued 255 PM CST Sun Dec 27 2020/ This morning we observed warmer low temps across the area, as most sites were in the 30-40s and 50s observed at some locations. A weak backdoor cold front will move through the area this afternoon, temporarily shifting wind direction to the NE-E, then stall over the Pecos River.
A few lobes of short wave energy will be rounding the base of a Hudson Bay mean low pressure and trough that extends southward into the eastern CONUS. At the surface a cold front will be pulled eastward by a low tracking through the Great Lakes. A cold front will move into the area Monday. The threat of showers wanes through the day Monday with cooler air entering back into eastern Kentucky. The beginning of the forecast period is fairly quiet as high pressure sits to our north, centered over Ohio and the Lower Great Lakes. Temperatures stay fairly chilly with highs in the lower 40s and nighttime temps in the low 30s.
446 PM MST Sun Dec 27 2020 Current surface analysis shows cold front south and west of the forecast area, with colder air continuing to filter into the area. A unsettled and cooler pattern can be expected through the first half of the week as active west-northwest flow persists. Monday looks to be quiet with seasonable temperatures before a larger and stronger upper trough off the west coast moves quickly inland and across the western US. As the trough moves over the Rockies late Monday and Monday night, southwest flow ahead of it will bring increasing chances for snow Monday night.
A few lobes of short wave energy will be rounding the base of a Hudson Bay mean low pressure and trough that extends southward into the eastern CONUS. At the surface a cold front will be pulled eastward by a low tracking through the Great Lakes. A cold front will move into the area Monday. The threat of showers wanes through the day Monday with cooler air entering back into eastern Kentucky. The main concern through the first half of the period is the increase in low level wind shear tonight as a cold front approaches from the west. As this cold front continues to approach, clouds thicken and ceilings lower to MVFR levels by tomorrow morning, possibly lowering further to IFR levels around 15z or so.
/issued 235 PM CST Sun Dec 27 2020/ Weather tonight and Monday will trend cooler though remain benign across the Texas South Plains region. RMcQueen An upper-level trough currently centered off of the US coast is progged to move east towards the area and deepen, driving a cold front east with it. Ahead of this next system, south to southeasterly surface winds will help to moisten the lower levels of the atmospheric column.
/Issued 213 PM EST Sun Dec 27 2020/ High pressure ridge across central Georgia will shift slightly south overnight and Monday as a weak cold front approaches from the north and west. Upper level pattern is mostly zonal and high pressure ridge at the surface remains entrenched across south central/south GA.
353 PM CST Sun Dec 27 2020 Tonight through Monday night focus remains on the upper low moving inland across southern California tonight.
500 PM CST Sun Dec 27 2020 Warm and breezy conditions continued ahead of a cold front that is on the western edge of the forecast area this afternoon. We expect temperatures to be 10 to 15 degrees cooler on Monday than they were today as northwest winds bring a cooler airmass into our area. An active week is expected with several rounds of precipitation as an upper level trough tracks slowly eastward from the southwest US into the Ohio Valley.
237 PM PST Sun Dec 27 2020 The Inland NW will continue to see areas of fog and low clouds, with occasional flurries or freezing drizzle.
An approaching cold front will bring increasing low clouds and a chance of rain to all sites this evening.
342 PM CST Sun Dec 27 2020 A cold front will trigger widely scattered showers across central Illinois early this evening before colder and drier weather arrives tonight into Monday. 21z/3pm surface analysis shows a 1003mb low over northern Illinois with a cold front trailing southwestward along the Illinois River. The airmass ahead of the front is quite dry: however, gradual boundary layer moistening has been occurring as evidenced by dewpoints climbing into the lower 40s east of the I-55 corridor late this afternoon.
330 PM MST Sun Dec 27 2020 Current surface analysis shows cold front south and west of the forecast area, with colder air continuing to filter into the area. A unsettled and cooler pattern can be expected through the first half of the week as active west-northwest flow persists. Monday looks to be quiet with seasonable temperatures before a larger and stronger upper trough off the west coast moves quickly inland and across the western US. As the trough moves over the Rockies late Monday and Monday night, southwest flow ahead of it will bring increasing chances for snow Monday night.
The high settling into the Dakotas is also not very strong. A cold front will follow, entering northern MN around midnight tonight and dropping southward on Monday. This is in association with a second trough rotating around the Hudson Bay upper low.
1117 PM CST Sun Dec 27 2020 Warm and breezy conditions continued ahead of a cold front that is on the western edge of the forecast area this afternoon. We expect temperatures to be 10 to 15 degrees cooler on Monday than they were today as northwest winds bring a cooler airmass into our area. An active week is expected with several rounds of precipitation as an upper level trough tracks slowly eastward from the southwest US into the Ohio Valley.
151 AM EST Mon Dec 28 2020 A weak and decaying coastal trough continues to produce some shower activity over the Atlantic waters and east coast metro areas early this morning.
(Today and tonight) Cold air advection and extensive cloud cover will result in a much cooler day today, with highs limited to the 40s and 50s. Deep moisture advecting from the gulf will isentropically ascend tonight ahead of an approaching trough, resulting in light rain gradually spreading northward overnight and becoming widespread by morning. Temperatures in northwest Oklahoma are expected to drop just below freezing overnight, allowing freezing rain to fall.
High pressure will continue to sag south through the night, with cooler temperatures over what we say last night.
In between, southerly winds continue to bring an increase in low level moisture into the region, with temperatures about 10 to 15 degrees warmer than this time last night, and dewpoints between 10 and 20 degrees higher. A cold front lags into central Louisiana on Monday, and expect a few showers in proximity to the front.
319 AM EST Mon Dec 28 2020 The next few days will see picture perfect weather as high pressure builds from the midwest to the mid atlantic and northeast states. This is all a result of a trough with very cold air digging into the southwestern states causing a upper ridge to build over us. The trough and cold air to our west will be the weather maker for the country and eventually for us. By midweek the trough and cold air will have moved into West Texas and well south into Mexico.
A dry cold front late tonight will bring cooling through mid week.
1131 PM CST Sun Dec 27 2020 A cold front will trigger widely scattered showers across central Illinois early this evening before colder and drier weather arrives tonight into Monday. Temperatures are falling fairly quickly from 50s ahead of the front into the low to mid 30s behind the front with northwest winds gusting 20 to 30 mph. 21z/3pm surface analysis shows a 1003mb low over northern Illinois with a cold front trailing southwestward along the Illinois River. The airmass ahead of the front is quite dry: however, gradual boundary layer moistening has been occurring as evidenced by dewpoints climbing into the lower 40s east of the I-55 corridor late this afternoon.
The higher winds were on the order of 5 knots or so higher that all available guidance. Over the next several days a deep anticyclone will move over the eastern CONUS, which will build into the Florida Keys area.
Some MVFR clouds could be possible along the highway 84 corridor during the day as a weak front moves through.
1035 PM CST Sun Dec 27 2020 06Z TAF issuance Winds have switched to the east behind a weak cold front. /issued 522 PM CST Sun Dec 27 2020/ 00Z TAF issuance A weak cold front will continue to cross the terminals this evening with winds becoming east but staying very light. /issued 255 PM CST Sun Dec 27 2020/ This morning we observed warmer low temps across the area, as most sites were in the 30-40s and 50s observed at some locations. A weak backdoor cold front will move through the area this afternoon, temporarily shifting wind direction to the NE-E, then stall over the Pecos River.
1116 PM CST Sun Dec 27 2020 Tonight through Monday night focus remains on the upper low moving inland across southern California tonight.
Scattered light snow showers moving south ahead of a mid level wave and cold front. Mid level embedded short wave trough and associated sfc cold front diving south into the Northern Plains tonight. A cold front will deliver cold temperatures early Monday morning in the single digits below zero north to single digits above zero south. Warmer southwest where highs nearing 30 are possible.
A low pressure system off the California coast will move inland tonight, then track east into southern Utah Monday.
Fog and low stratus will keep in place across the lower Snake Plain and adjoining valleys in Baker county and the Weiser River basin. Otherwise a high cloud shield over portions of the area will mark the northern boundary a low pressure system pushing onto the central CA coast. Fog beginning to push northward towards KBKE from the Lower Treasure valley at this time.
Another fairly quiet evening expected with mainly upper level cloud cover expected overnight, before the approaching cold front brings chances for precip to northern and northwestern Georgia early Monday. Otherwise, overnight low temperatures are expected to be in the lower 30s across the state. /Issued 213 PM EST Sun Dec 27 2020/ High pressure ridge across central Georgia will shift slightly south overnight and Monday as a weak cold front approaches from the north and west. Upper level pattern is mostly zonal and high pressure ridge at the surface remains entrenched across south central/south GA.
A dry cold front late Monday will bring cooling through mid week.
913 PM MST Sun Dec 27 2020 EVENING UPDATE: Comparing differences in satellite imagery, glimpses through the low cloud cover suggest fog may be already settling in the western zones. Expanded the patchy freezing fog from earlier to include the west and southern portions until Monday morning. Highs look to range from the 20s in the northeast to a little above freezing southwest of Fort Peck Lake.
Cold front has pushed through forecast area and has stalled along the front range with high pressure building into the Dakotas. A unsettled and cooler pattern can be expected through the first half of the week as active west-northwest flow persists. Monday looks to be quiet with seasonable temperatures before a larger and stronger upper trough off the west coast moves quickly inland and across the western US. As the trough moves over the Rockies late Monday and Monday night, southwest flow ahead of it will bring increasing chances for snow Monday night.
High pressure centered over the Mid-Atlantic coast will continue to progress slowly towards the east tonight through Monday night.
High pressure and a dry airmass will prevail through tonight. Skies are expected to be mostly clear with afternoon highs ranging from the lower 60s across the north to near 70 at Cross City.
(Today and tonight) A warm front just south of Junction. Low clouds will spread north with the warm front. Temperatures tonight will be steady or slowing rising behind the warm front, along with increasing winds. There is a chance of rain, particularly over the Big Country tonight as an upper trough approaches from the west.
a pretty strong low pressure system about to come onshore near central California. A slight delay from previous forecasts on this low. Widespread isentropic lift this evening as upper low nears the four corners area by 03Z tonight. Southeast winds fairly strong out ahead of this low as well across eastern Wyoming. Also the Pine Ridge in Niobrara County and the northern Panhandle may need another look for possible warnings. Generally cool to mild temperatures expected during the period with little precipitation expected, and that being confined mainly to the higher mtns.
There could be a few pockets of freezing rain mixed in, but much of the night should be mainly snow. There will be warm advection and temperatures above the surface should warm above freezing. The GFS is much warmer than other models and if it were to happen, it would be more rain than anything else, but the rest of the models have some warming, and there will be some rain, but cooler temperatures at the surface and that makes for freezing rain. For Tuesday, have the freezing rain and snow spreading across the area during the morning.
351 AM MST Mon Dec 28 2020 Current upper level analysis has broad trof across the northern CONUS, weak ridging across the Rockies, and a deeper trof and cut off low along the West Coast. At the surface, high pressure is located across eastern SD and Nebraska, with a weak lee trof across central Montana and Wyoming. Large precipitation shield develops north of the low and moves into southern and western portions of the area early this evening.
522 AM CST Mon Dec 28 2020 (Today and tonight) Cold air advection and extensive cloud cover will result in a much cooler day today, with highs limited to the 40s and 50s. Deep moisture advecting from the gulf will isentropically ascend tonight ahead of an approaching trough, resulting in light rain gradually spreading northward overnight and becoming widespread by morning. Temperatures in northwest Oklahoma are expected to drop just below freezing overnight, allowing freezing rain to fall.
Temperatures will decrease over the course of the day in the wake of a crossing cold front. Overall, and accumulation will be light with an inch at best with a dusting at most locations and up to between an inch or two locally north of I-80 where the BL supports slightly better ratios and in the ridges with orographic enhancement. Light snow showers will linger Tuesday morning along and north of I-80 under cold northwesterly flow aloft but end by the afternoon with increasing subsidence and high pressure assumes control.
Mid-level ridging will move east today and tonight, shifting our southerly winds to the southeast early today. Winds will increase tonight as a mid-level trough approaches the area tonight through Tuesday. Newest model continue to indicate a much deeper trough than originally forecast.
/issued 313 AM CST Mon Dec 28 2020/ Low-level mstr will start to increase today and into tonight as e-se winds advect mstr/warmer temps. By late Tue PM a dryline will set-up across the ern CWFA as a Pacific cold front approaches (in assocn with mid/upper trof to the w). It is always difficult to tell where the collision/merger will occur as the dryline may move w some? Meanwhile there may be enough jet energy juxtaposition with the dryline/Pacific front for tstms to develop across the PB and possibly the Lower Trans Pecos late Tue night/early Wed morning, a few strong storms are possible. The mid/upper level trof will develop a closed low INVOF Chihuahua, MX 12Z/Wed.
435 AM EST Mon Dec 28 2020 A light wintry lake effect mix will become just snow before ending this afternoon, otherwise dry weather is expected through Tuesday with highs around freezing both today and Tuesday.
951 AM EST Mon Dec 28 2020 High pressure continues across the area with continued moderating conditions.
Areas of freezing fog will continue to impact valley locations across north central Idaho and northwest Montana this morning. High pressure will remain entrenched across central Idaho through this afternoon; therefore, valley fog and stratus will be slow to burn off today. A period of freezing drizzle is also possible across northwest Montana Tuesday morning. Confidence for widespread ice accretion is low at this time, nonetheless, pockets of freezing drizzle could impact the Tuesday morning commute.
The higher precip chances will favor eastern OK and points westward. A non zero chance of light freezing rain does exist near the OK / KS border late tonight, however the more likely scenario will be sfc temps just above freezing and all liquid precip. No impacts would be expected should a brief window of freezing rain develop. The warm advection zone of precip will lift north of the forecast area by Tuesday afternoon, while an expanding area of rain of develops further west and spreads into NE OK as the system cold front advances eastward.
547 AM MST Mon Dec 28 2020 Low stratus has moved into much of southeastern Montana with some of the low clouds settling onto the ground as fog. The trof will track further south of our area than what we saw 24 hours ago which will keep most of the moisture out of our area. As high pressure builds over Yellowstone National Park, the pressure gradient will tighten and winds will increase overnight on Tuesday where winds will gust to 45 mph. High temperatures will stay in the 30s with a few locations warming into the low 40s today and Tuesday. Outside of some periods of snow over the mountains, the lower elevations look to remain mostly dry through the extended.
At the surface, a back door cold front continues to push south southwest across the state. By early afternoon, clouds should start to break up and diminish as upper level ridging builds in. A mid level disturbance and associated cold front will push from north to south tonight, returning low VFR/MVFR ceilings to all terminals.
The lift from this trough was bringing a large area of mid level clouds to our region along with some flurries upstream in north dakota early this morning. For tonight through Tuesday night, our region is on track for an upper level low pressure trough ejecting out of the southwest and into our region. The lift from this trough along with waa will bring widespread snow to the region by Tuesday morning.
638 AM EST Mon Dec 28 2020 A light wintry lake effect mix will become just snow before ending this afternoon, otherwise dry weather is expected through Tuesday with highs around freezing both today and Tuesday.
As of 2 AM, a low pressure area was over the Great Lakes region while high pressure was building southeastward into Iowa. High pressure will build into the area today providing the region with mostly sunny skies and a west breeze at 10 to 15 MPH. Clouds will spread into the region from the southwest late tonight, but with light winds and initially mostly clear skies temperatures will drop into the low teens north to upper teens south.
High pressure remains draped over the eastern seaboard just north of the forecast area today. Then, shifting offshore into the Atlantic tonight ahead of a weak, dry cold front pushing southeastward through the eastern US. Meanwhile, mid/upper level high pressure will build in over the area from the GOMEX, reinforcing the subsidence inversion and eroding any mentionable PoPS from the afternoon through the overnight. The warming trend continues, with highs this afternoon reaching the low to mid 70s across the area. Overnight lows in the low to mid 50s.
313 AM CST Mon Dec 28 2020 Low-level mstr will start to increase today and into tonight as e-se winds advect mstr/warmer temps. By late Tue PM a dryline will set-up across the ern CWFA as a Pacific cold front approaches (in assocn with mid/upper trof to the w). It is always difficult to tell where the collision/merger will occur as the dryline may move w some? Meanwhile there may be enough jet energy juxtaposition with the dryline/Pacific front for tstms to develop across the PB and possibly the Lower Trans Pecos late Tue night/early Wed morning, a few strong storms are possible. The mid/upper level trof will develop a closed low INVOF Chihuahua, MX 12Z/Wed.
At the surface, a back door cold front continues to push south southwest across the state. By early afternoon, clouds should start to break up and diminish as upper level ridging builds in.
347 AM MST Mon Dec 28 2020 Current upper level analysis has broad trof across the northern CONUS, weak ridging across the Rockies, and a deeper trof and cut off low along the West Coast. At the surface, high pressure is located across eastern SD and Nebraska, with a weak lee trof across central Montana and Wyoming. Large precipitation shield develops north of the low and moves into southern and western portions of the area early this evening.