Aikyam-Lab/Synoptic-Bench huggingface dataset:
Highs range from the mid 40s in the Big Country to the low 60s in the Northwest Hill Country. Lows will be in the mid to upper 20s, likely the lowest we'll see this week. Upper level ridging will build back into the area Thursday.
An upper level high is moving in behind the low, bringing mostly sunny skies to the area this afternoon and evening. Highs will be in the low to mid-50s. An upper-level short wave trough will move out of Mexico into the Texas Panhandle tomorrow.
331 PM EST Wed Jan 27 2021 Synopsis/Discussion/Marine - Light Lake Effect Snow Tonight and Thursday - Ridge Brings Quiet Weather to End the Work Week - Watching System Over The Weekend for Snow -- Light Lake Effect Snow Tonight and Thursday -- Instability is surely in place tonight and Thursday with delta t's on the order of 20C tonight.
226 PM CST Wed Jan 27 2021 An upper level trough/low is over Missouri and Illinois and another upper trough is moving onto the west coast. An upper ridge begins to build over the central part of the country on Thursday with southerly winds returning to the area.
/NEW/ /Through Thursday/ High pressure at all levels of the troposphere will build across North and Central Texas over the next 24 hours as last night's upper low exits to the east.
With even subtle mixing overnight the lows for overnight and Thursday morning will likely be right after midnight with a marginal warming beyond that point. Coldest overnight temperatures will be again the single digits, with probably warmer teens over south central and southwest Kansas.
1211 PM EST Wed Jan 27 2021 Intensifying low pressure system will move along a stalled front across the area today and tonight, providing a quick shot of soaking rainfall. Cold and dry Canadian high pressure will follow and Thursday and extend into the upcoming weekend.
Area of cloud cover currently running from the eastern Dakotas across much of central and southern Minnesota looks to stick around to a large extent as it shifts east tonight into early Thursday, then we'll see an increase in mid-high clouds later Thursday into Thursday night with warm advection and upstream clouds spilling down the ridge.
Mixture of sun and clouds this morning will give way to mostly cloudy/overcast conditions this afternoon as a cold front sweeps into the region from the NW late in the day into the evening. The clouds should decrease during Thursday morning as modified Canadian high pressure builds towards the region. Even with more sun in the afternoon, high temperatures will only rise into the lower 40s. Even colder Thu night with lows falling into the low/mid 20s.
The base of a 500mb trough will be rounding out atop the Mid State this afternoon and evening when the bulk of precipitation is expected.
357 PM EST Wed Jan 27 2021 A strong cold front will cross the region later tonight.
so don't plan on "realizing" those warmer ambient temperatures! Other than the breezy cold, dry weather is expected throughout the day.
257 PM CST Wed Jan 27 2021 Warm front band of snow is slowly moving eastward, with diminishing snow rates as it progresses. If some of the lower level clouds can diminish, peaks of sunshine may come through.
300 PM CST Wed Jan 27 2021 Clouds have consumed much of the area this afternoon as a mid- level trough moves overhead.
A couple quiet and cold days are on tap, as Canadian high pressure drifts east across the Midwest.
/issued 1107 AM CST Wed Jan 27 2021/ A potent fast moving upper level trough is impacting the Mid-South today. /issued 423 AM CST Wed Jan 27 2021/ Colder air continues to filter into the Mid-South this morning behind a cold front that is located across Central Mississippi into Central Alabama at this time. Meanwhile, an upper level trof is digging into Southwest Missouri and Northwest Arkansas at this time. The trough will move through the Mid-South today. Precipitation associated with the upper trough will begin to move into Northeast Arkansas shortly after sunrise. Accumulations will mainly occur on grassy and elevated surfaces, but can't rule out some travel problems as bridges and overpasses may become slick. High pressure will build into the region on Thursday.
As the main low pressure center from this system pushes off the carolina coast late tonight, the pressure gradient over GA tightens, increasing NW wind speeds across the state.
With mid and upper ridging over the region, no precipitation is expected tonight or tomorrow. Warmer temperatures are expected Thursday afternoon.
Snow is expected to rapidly increase in coverage early this morning from southwest to northeast as an upper level low pressure system over central KS moves eastward into central and northern MO. As this area of increasing lift spreads into the forecast area where surface temperatures are currently below freezing, we expect a rapid uptick in snowfall coverage over the next 1-3 hours. Lows tonight into Thursday morning will then drop into the upper teens to the lower 20s.
1016 AM EST Wed Jan 27 2021 High pressure ridges over Florida for the first half of the day before a weak cold front moves through later this evening. Southwest winds around 5-10 knots expected today ahead of a cold front expected to move through later today. Interaction between high pressure extending over Florida and a cold front that is expected to move through later today will keep a SW wind flow around 10-15 knots through the evening. Winds and seas are expected to decrease below SCA by late Thursday evening as high pressure settles in over the eastern half of the U.
1107 AM CST Wed Jan 27 2021 A potent fast moving upper level trough is impacting the Mid-South today. /issued 423 AM CST Wed Jan 27 2021/ Colder air continues to filter into the Mid-South this morning behind a cold front that is located across Central Mississippi into Central Alabama at this time. Meanwhile, an upper level trof is digging into Southwest Missouri and Northwest Arkansas at this time. The trough will move through the Mid-South today. Precipitation associated with the upper trough will begin to move into Northeast Arkansas shortly after sunrise. Accumulations will mainly occur on grassy and elevated surfaces, but can't rule out some travel problems as bridges and overpasses may become slick. High pressure will build into the region on Thursday.
252 PM CST Wed Jan 27 2021 Skies have cleared out this afternoon and allowed temps to reach 40 in a few spots, but those with snow cover remain below freezing at this hour. Thursday should see a return to more climatological norms for temps as the southerly flow and lee side troughing that develops bring warm air to the area.
The worst conditions will remain in the higher terrain of Idaho through this afternoon.
221 PM CST Wed Jan 27 2021 Clouds will continue to clear in the wake of the departing upper trof this evening. However, there is potential for freezing fog later this evening into early Thursday morning in the developing south-southeast return flow over the snow cover in central and parts of southeast Kansas.
/Updated at 1138 AM CST Wed Jan 27 2021/ An upper level trough over Missouri will move east across the Ohio and Tennessee Valley regions this afternoon and evening. A sharp cold front will move through the area tonight with blustery northwest winds that will usher in colder and drier air. Highs today will range from the low 50s northwest to the mid 60s south followed by a freeze tonight for areas along and northwest of Interstate 85. Lows will range from the upper 20s northwest to the low 30s southeast. Highs Thursday will only range from the mid 40s north to the low 50s southeast.
A cold front has moved offshore and winds behind this boundary are from the north across South Central Texas. An upper level ridge will build over the Southern Plains tonight and move across the region during this period. The cold advection will continue tonight and low temperatures will drop into the 30s everywhere except the Rio Grande Plains where they will be in the lower 40s.
242 PM EST Wed Jan 27 2021 Arctic high pressure will build gradually east/southeast through Ontario and maintain a cold airmass across the area with generally quiet weather conditions.
/Tonight through Tomorrow Night/ The Four-States region can expect a relatively quiet short-term period over the next 36 hours, thanks in part to the cold front that moved through the region today. Behind this front, strong NW flow will set up as upper level ridging builds in and moves east. Lows tonight will range from the upper 20s north, to the mid 30s south, with overnight lows tomorrow ranging in the low 30s area- wide. Highs tomorrow will also feel a little more seasonal, with highs ranging from the low to mid 50s.
235 PM CST Wed Jan 27 2021 Quiet and cold again tonight as strong Arctic high pressure slowly builds east. As high pressure digs into IA, overnight temperatures will plummet once again with the coldest air in northwest IA. Although warm air advection and height rises will bring higher temperatures for Thursday, it probably won't feel much warmer due to increase cloud cover and increasing winds. Thursday night's main focus will be continued stratus coverage and slightly warmer overnight lows.
144 PM CST Wed Jan 27 2021 /Updated at 1138 AM CST Wed Jan 27 2021/ An upper level trough over Missouri will move east across the Ohio and Tennessee Valley regions this afternoon and evening. A sharp cold front will move through the area tonight with blustery northwest winds that will usher in colder and drier air. Highs today will range from the low 50s northwest to the mid 60s south followed by a freeze tonight for areas along and northwest of Interstate 85. Lows will range from the upper 20s northwest to the low 30s southeast. Highs Thursday will only range from the mid 40s north to the low 50s southeast.
1106 AM MST Wed Jan 27 2021 Main Forecast Concerns/Challenges: 1) Patchy dense freezing fog this morning across southern El Paso and northern Pueblo counties, and across the far eastern plains. With the cold temps in place, freezing fog with slick conditions has been a concern. Additionally, slick or icy conditions could also be observed, especially on bridges or elevated surfaces. In this location, patchy dense fog/freezing fog will also be possible.
939 AM CST Wed Jan 27 2021 The cold front has moved through all but the far southeast corner of the coastal waters this morning. Latest sfc obs indicate dense fog continuing at the Acadiana terminals - however this is expected to be short-lived at this point as brisk nwrly flow associated with the passing cold front should dissipate the fog upon its arrival next hour or so. High pressure will build into the area this morning with skies beginning to clear from west to east this morning into the afternoon.
132 PM EST Wed Jan 27 2021 High pressure will only slowly build in from the west through the rest of the week, leading to mainly dry and cold conditions. The wind will ramp back up even before sunrise, esp over the S, as a trough passes well to our south. A substantial trough aloft with almost no moisture will be zipping toward NY from James Bay through the day, but any meager SHSN/flurries from this feature will not arrive until after dark.
SR Chattanooga Airport, TN 30 44 27 50 30 / 30 0 0 0 0 Knoxville McGhee Tyson Airport, TN 29 38 23 44 27 / 80 0 0 0 0 Oak Ridge, TN 27 39 23 45 26 / 80 0 0 0 0 Tri Cities Airport, TN 26 34 18 39 23 / 80 10 0 0 0 TN.
238 PM EST Wed Jan 27 2021 A large high pressure area will bring a cold north flow accompanied by light lake effect snow inland south of Lake Michigan into Thursday; otherwise, partly to mostly cloudy skies are expected.
Overnight high pressure will build across the area, keeping skies clear and winds light. As the ridge axis moves across the area winds will gradually shift to the south.
213 PM CST Wed Jan 27 2021 Benign and near normal conditions will remain across the area through Thursday under high pressure. Warm advection will begin Thursday afternoon as pressures begin to fall in the High Plains with any clouds or minor weather arriving Thursday night.
234 PM MST Wed Jan 27 2021 Latest analysis shows an upper ridge over the region with warmer air beginning to move in from the west. Gusty southwesterly winds will continue tonight over parts of northeastern Wyoming and over the higher terrain of the Black Hills as the southwesterly WAA continues aloft.
618 PM CST Wed Jan 27 2021 Water vapor imagery and the in-progress 00Z KBIS raob indicated an increase in mid-level dry air and subsidence as a ridge builds aloft, above a shallow saturated boundary layer. With the boundary layer moisture locked in place, temperatures should stay relatively warmer than the previous two nights. Warm front band of snow is slowly moving eastward, with diminishing snow rates as it progresses. If some of the lower level clouds can diminish, peaks of sunshine may come through.
Southwest surface winds are forecast to increase and become gusty during the late morning hours Thursday, continuing through the afternoon as the pressure gradient tightens across the region in response to a developing surface trof of low pressure over eastern CO and northeast NM. /Issued 252 PM CST Wed Jan 27 2021/ Skies have cleared out this afternoon and allowed temps to reach 40 in a few spots, but those with snow cover remain below freezing at this hour. Thursday should see a return to more climatological norms for temps as the southerly flow and lee side troughing that develops bring warm air to the area.
Cold front continues to move through northern FL with a well developed line of strong/gusty showers out ahead of it. Dense marine fog still remains over parts of the coastal waters out ahead of a cold front that will be moving through overnight. High pressure then slides off to the east over the Carolinas by the weekend, resulting in lighter easterly flow and calmer seas.
834 PM EST Wed Jan 27 2021 A wave of low pressure will provide accumulating snow early tonight, mainly along and south of the Ohio River.
Satellite trends suggest the higher coverage of low stratus will remain to the west and north through the night. Arctic high pressure will build gradually east/southeast through Ontario and maintain a cold airmass across the area with generally quiet weather conditions.
554 PM CST Wed Jan 27 2021 For the 28/00Z TAF period, VFR conditions will prevail this period under N/NW flow at the sfc and much of the low-mid levels. Meanwhile, some low-level stratocu to our north continues to wrap around a departing upper low entering the Ohio Valley. /Tonight through Tomorrow Night/ The Four-States region can expect a relatively quiet short-term period over the next 36 hours, thanks in part to the cold front that moved through the region today. Behind this front, strong NW flow will set up as upper level ridging builds in and moves east. Lows tonight will range from the upper 20s north, to the mid 30s south, with overnight lows tomorrow ranging in the low 30s area- wide. Highs tomorrow will also feel a little more seasonal, with highs ranging from the low to mid 50s.
18Z surface data has high pressure from the upper Midwest into the southern Plains. Quiet, dry and cold conditions will be seen late this afternoon through Thursday as high pressure slowly moves through the Midwest. The first one over the weekend is likely to bring more snow and possibly a wintry mix of rain and freezing rain to portions of the area, along with gusty winds.
619 PM EST Wed Jan 27 2021 A large high pressure area will bring a cold north flow accompanied by light lake effect snow inland south of Lake Michigan into Thursday; otherwise, partly to mostly cloudy skies are expected.
Light winds ahead of an approaching low-level ridge and strong radiational cooling with clearing skies and fresh snow cover should allow tonight's low temps to fall into the single digits across northeastern MO and west- central IL and the 10Fs elsewhere. On Thursday, an expansive upper-level ridge is progged to shift into the central U. Despite mostly clear skies, Thursday's high temps will likely only warm to around or just below average with WAA not ensuing low-level flow not turning to south-southwest until a low- level ridge shifts east of the area during the late afternoon. Pfahler The upper-level ridge will continue to dominate the central U.
Expect this ridge to slowly breakdown through tomorrow allowing return flow to persist ahead of the next storm system this weekend.
401 PM EST Wed Jan 27 2021 The main weather news will be the passage of a strong cold front on Thursday morning.
Clouds will continue to clear in the wake of the departing upper trof this evening. However, there is potential for freezing fog later this evening into early Thursday morning in the developing south-southeast return flow over the snow cover in central and parts of southeast Kansas.
/issued 226 PM CST Wed Jan 27 2021/ An upper level trough/low is over Missouri and Illinois and another upper trough is moving onto the west coast. An upper ridge begins to build over the central part of the country on Thursday with southerly winds returning to the area.
310 PM CST Wed Jan 27 2021 18Z surface data has high pressure from the upper Midwest into the southern Plains. Quiet, dry and cold conditions will be seen late this afternoon through Thursday as high pressure slowly moves through the Midwest. The first one over the weekend is likely to bring more snow and possibly a wintry mix of rain and freezing rain to portions of the area, along with gusty winds.
Precipitation associated with the quick moving upper trough is pushing east into Middle Tennessee. Should start to see some clearing after midnight according to the low level RH fields but would not be surprised to clouds hang in for most of the night.
Dry high pressure will dominate the weather with cooler and drier conditions.
325 PM MST Wed Jan 27 2021 Synoptic Overview: An upper level ridge, presently situated over the Rockies, will amplify as it shifts eastward over the central CONUS Tonight/Thu.
415 PM MST Wed Jan 27 2021 Mid and high clouds swept over the region throughout the day as a mid-level trough deepened over the eastern Pacific. Flow becomes more southwesterly tonight as the trough deepens further.
625 PM EST Wed Jan 27 2021 High pressure will only slowly build in from the west through the rest of the week, leading to mainly dry and cold conditions. The wind will ramp back up even before sunrise, esp over the S, as a trough will be passing to our south. A substantial trough aloft with almost no moisture will be zipping toward NY from James Bay through the day, but any meager SHSN/flurries from this feature will not arrive until after dark.
The model blend also predicts lows in the low single digits in the valleys of swrn and scntl Nebraska which would send humidity to 100 percent.
A cold front slid through much of the region today and an upper level trough swung across the northern part of the state. High pressure at the surface will continue to move in. It will be rather chilly overnight with lows dropping into the upper 20s and lower 30s north to near freezing across the south. As upper ridging moves overhead tomorrow, sunny skies will prevail. Highs will reach the mid 40s north to the lower 50s south.
This evening through Thursday night An approaching trough will bring two issues concerning the short term forecast. While only 1 to 3 inches of snow fell recently across that area, it should be primed to blow as temperatures have stayed well below freezing, keeping it from glazing over. Elsewhere, locations will mainly remain dry, with warmer highs on Thursday as warmer air advects into the area. The gusty southwest wind will remain across the Wind Corridor through the period, but expect the highest winds today.
246 PM MST Wed Jan 27 2021 Mid and high clouds swept over the region throughout the day as a mid-level trough deepened over the eastern Pacific. Flow becomes more southwesterly tonight as the trough deepens further.
652 PM EST Wed Jan 27 2021 Aviation - Light Lake Effect Snow Tonight and Thursday - Ridge Brings Quiet Weather to End the Work Week - Watching System Over The Weekend for Snow -- Light Lake Effect Snow Tonight and Thursday -- Instability is surely in place tonight and Thursday with delta t's on the order of 20C tonight.
733 PM EST Wed Jan 27 2021 High pressure will only slowly build in from the west through the rest of the week, leading to mainly dry and cold conditions. The wind will ramp back up even before sunrise, esp over the S, as a trough will be passing to our south. A substantial trough aloft with almost no moisture will be zipping toward NY from James Bay through the day, but any meager SHSN/flurries from this feature will not arrive until after dark.
Dry and cool conditions will continue for the rest of the work week with warmer conditions and rain over the weekend. Precipitation associated with the quick moving upper trough is pushing east into Middle Tennessee. Should start to see some clearing after midnight according to the low level RH fields but would not be surprised to clouds hang in for most of the night.
700 millibar temperatures are expected to climb to around -2 deg C beneath ridging aloft.
535 PM CST Wed Jan 27 2021 Benign and near normal conditions will remain across the area through Thursday under high pressure. Warm advection will begin Thursday afternoon as pressures begin to fall in the High Plains with any clouds or minor weather arriving Thursday night.
Clouds have consumed much of the area this afternoon as a mid- level trough moves overhead.
Winds will slowly abate through the day Thursday as high pressure builds across the region. /issued 244 PM CST Wed Jan 27 2021/ High pressure will build in and bring a couple of cool and rather dry days.
236 PM MST Wed Jan 27 2021 An approaching trough will bring two issues concerning the short term forecast. While only 1 to 3 inches of snow fell recently across that area, it should be primed to blow as temperatures have stayed well below freezing, keeping it from glazing over. Elsewhere, locations will mainly remain dry, with warmer highs on Thursday as warmer air advects into the area. The gusty southwest wind will remain across the Wind Corridor through the period, but expect the highest winds today.
Chattanooga Airport, TN 30 44 26 49 29 / 10 0 0 0 0 Knoxville McGhee Tyson Airport, TN 29 38 22 44 26 / 80 10 0 0 0 Oak Ridge, TN 27 39 21 44 26 / 60 0 0 0 0 Tri Cities Airport, TN 26 34 18 40 20 / 70 10 0 0 0 TN.
With the cold front pushing offshore this morning, high pressure will begin to settle in across the region with an upper level ridge building up to the 250 mb level through tomorrow night. With cold air advection tonight and mostly clear to partly cloudy skies, temperatures are expected to drop into the lower to mid 40s tonight before warming into the upper 50s to mid 60s tomorrow.
426 PM MST Wed Jan 27 2021 Latest analysis shows an upper ridge over the region with warmer air beginning to move in from the west. Gusty southwesterly winds will continue tonight over parts of northeastern Wyoming and over the higher terrain of the Black Hills as the southwesterly WAA continues aloft.
609 PM CST Wed Jan 27 2021 Quiet and cold again tonight as strong Arctic high pressure slowly builds east. As high pressure digs into IA, overnight temperatures will plummet once again with the coldest air in northwest IA. Although warm air advection and height rises will bring higher temperatures for Thursday, it probably won't feel much warmer due to increase cloud cover and increasing winds. Thursday night's main focus will be continued stratus coverage and slightly warmer overnight lows.
However, a few sucker holes are likely to develop as subsidence continues behind the exiting upper trough.
241 AM CST Thu Jan 28 2021 High clouds will continue over the region on the heels of a broad trough pressing east of the Mississippi and weak ridging building over the Rockies and adjacent plains. One more cool afternoon in store as local thickness pattern yields another 3-5F below normal day for much of the forecast area before we firmly rebound back above normal (60s with some 70s over the river valleys) on Friday as the ridge axis pumps overhead.