Aikyam-Lab/Synoptic-Bench huggingface dataset:
457 PM CST Thu Feb 20 2020 147 PM CST Currently, temperatures are in the low to mid 20s with northwesterly winds and clear skies. Looking upstairs, a strongly- positively tilted trough is located over the eastern United States with deep ridging across the west. Tonight, winds will relax and gradually become southwesterly as the aforementioned high pressure system drifts southward. 05"), temperatures will take the plunge overnight but not "too far" thanks to an increasing pressure gradient and hence surface winds right around daybreak as we find ourselves on the northern extent of the high. Temperatures are poised to rise above normal once again with highs in the upper 30s to even lower 40s, thanks to sunny skies, dry air through the entirety of the lower troposphere, and deep mixing.
335 PM CST Thu Feb 20 2020 Mostly clear skies will continue across the Upper Midwest, as a strong area of high pressure continues moving south through the Great Plains. A dry warm front will move east through the region overnight, with southwesterly winds and warm air advection. Overnight, patchy fog is possible across the region as the warmer temperatures contribute to snowmelt and trap the released moisture under a strong inversion.
upper level high pressure is forecast to build across Utah and spread east across Colorado on Friday. Areas that received snowfall will likely be a few degrees cooler.
646 PM EST Thu Feb 20 2020 A large ridge of high pressure will move over the region tonight and bring very chilly low temperatures from 5 degrees above zero to around 10.
631 PM EST Thu Feb 20 2020 Low pressure heads east off SE US Coast tonight. Strong high pressure dominates Friday through the weekend, which starts cold and then moderates.
533 PM CST Thu Feb 20 2020 High pressure will give way to an increase in southwesterly winds on Friday.
The polar high that extends from IA to ern KS will shift into the lower MS River Valley and Ohio River Valley for Fri-Fri nt. The warm advection and sunshine will boost temps back above freezing for Fri afternoon. Forecast confidence is high: Strong high pressure centered just to the southwest of Wisconsin will gradually pull away to the southeast tonight through Friday night.
124 AM EST Fri Feb 21 2020 A low pressure system off the Southeast coast will move slowly away from the eastern seaboard tonight. Dry and cool high pressure will spread in from the west on Friday and linger over the region through the weekend.
Higher elevations of western and central WY should remain just above freezing, remaining above the cold air inversions. Friday, the H5 ridge remains in place across the state, with broad westerly winds becoming notable for the northern mountain ranges. Mid-level flow will stay westerly on Saturday morning ahead of a trough that will pass over the Four Corners region Saturday night.
1133 PM CST Thu Feb 20 2020 Mostly clear skies will continue across the Upper Midwest, as a strong area of high pressure continues moving south through the Great Plains. A dry warm front will move east through the region overnight, with southwesterly winds and warm air advection.
Currently, upper level ridging, accompanied by dry westerly flow at mid levels and dry southwesterly surface winds allowed temperatures to climb into the upper teens, 20s and 30s across nearly all of western and central North Dakota. Warmer on Friday with highs from the low to mid 30s along, north, and east of the Missouri River.
A mid/upper ridge was situated across the Southwest extending northward across the Central Great Basin area. Downstream across the Central Plains region, high pressure was building southward in the wake of a cold front. As high pressure translates slowly south and east across the area tonight, the best radiational cooling should occur across mainly southeast KS with southwesterly low level flow returning to western and much of central KS. the low level thermal ridge will expand into the Central Plains over the weekend bringing moderating temperatures on Saturday.
1256 AM EST Fri Feb 21 2020 Low pressure heads east off SE US Coast tonight. Strong high pressure dominates Friday through the weekend, which starts cold and then moderates.
300 AM CST Fri Feb 21 2020 Something we don't see all that often at any time of year - an expanse of clear skies all throughout the region, with really the only feature of interest over the Lower 48 being a departing snow event over the Carolinas/southeastern Virginia. Closer to home, low level ridging rules the roost but continues to slide into the Mid Mississippi River Valley, with a tighter pressure gradient developing across the local area north of that feature. That setup will result in increasingly gusty conditions today, but with better mechanical mixing also delivering warmer conditions, though with gusts to 25+ mph at times, it might not feel all that warm.
The well anticipated closed low originating from the Pacific will begin its trek eastward Friday afternoon with the center reaching the California coast by Saturday morning. Rainfall will gradually end from west to east late Saturday afternoon as the low center gradually shifts into western Arizona Saturday evening. Snow is not expected to be a major impact, but 1-3 inches of snow will be possible on the higher passes in Lincoln County which include Panaca Summit.
A quiet pattern will persist through the period as weak ridging aloft shifts slowly east across the Colorado Rockies tonight, and further east into the Western High Plains Friday. Although a west-northwesterly flow aloft will intensify during the period, a cold/dry air mass will dominate the high plains of western Kansas capping any precip chances through late Friday afternoon. Developing lee side troughing will strengthen through the day Friday resulting in moderately gusty south- southwest winds by early afternoon. Precip chances return to western Kansas late in the weekend as medium range models remain in fair agreement indicating a closed upper low tracking eastward into the Four Corners Region late Saturday night, staging a strong and increasingly difluent southwest flow aloft across the Western High Plains.
1045 PM CST Thu Feb 20 2020 147 PM CST Currently, temperatures are in the low to mid 20s with northwesterly winds and clear skies. Looking upstairs, a strongly- positively tilted trough is located over the eastern United States with deep ridging across the west. Tonight, winds will relax and gradually become southwesterly as the aforementioned high pressure system drifts southward. 05"), temperatures will take the plunge overnight but not "too far" thanks to an increasing pressure gradient and hence surface winds right around daybreak as we find ourselves on the northern extent of the high. Temperatures are poised to rise above normal once again with highs in the upper 30s to even lower 40s, thanks to sunny skies, dry air through the entirety of the lower troposphere, and deep mixing.
Water vapor loop indicted an upper level trough located from northern SASK to southern ALTA. Downstream upper level ridge was over the area and will shift to the southeast overnight. Low level jet will occur east of upper trough and keep temps relatively mild overnight. Ensemble guidance agrees with this as most members keep surface temperatures near to just below freezing. If these warmer temperatures can start to mix down sooner higher temperatures in the mid to upper 30s are possible.
200 AM CST Fri Feb 21 2020 Low clouds/fog (some freezing) are pushed up into the mtns this morning with a stout e-se 850 mb wind. The low-level moisture starts to decrease above 700 mb and with cold temps in the moist layer and a se wind low-level component into the afternoon said clouds/fog/freezing fog will probably hang around through mid morning, thus the extension of the freezing fog advisory for GDP/Delaware/Davis Mtns until 15Z. A better warming signal is seen for Sat when the column warms (mid-level ridge) and surface pressures fall.
Mid-level warm advection is well underway with the departure of yesterday's thermal trough and will continue through the day, particularly as WSW flow aloft increases in response to deep low pressure pivoting across Hudson Bay. Uninhibited insolation will aid diurnal boundary layer growth allowing temperatures to climb into the low 30s by late afternoon as 850mb temps begin a slow ascent toward 0C by the end of the first period. Fairly static w/wsw mid- level flow regime will maintain steady transport of moderate air from the High Plains into Southeast Michigan.
Most newer 00Z to 02Z guidance seems to show warmer low temperatures as a result of these winds, despite clear skies. The exception to this will be the higher elevations above 1500 feet, which could see lows in the lower 20s. Arctic high pressure will slide south into the southern Plains Friday, maintaining a tight pressure gradient over the TN valley. Highs will be in the lower to middle 40s if we are fortunate enough with full sunshine. The high and ridge will shift southeast overhead Friday night/Saturday morning with lows again in the lower to middle 20s. With ample sunshine and temperature advection transitioning to warm, high temperatures will rebound into the lower to middle 50s.
Given how warm it has been overall this winter, tonight's combination of wind and subfreezing low temperatures will feel especially cold with wind chill readings expected to drop into the upper teens along the Hwy 82 corridor and the lower 20s during the early morning.
The biggest issue in the short term will be the possibility of high winds over the southshore tonight behind the cold front. We will have areas over the next two nights be at or below freezing. Either way it will be much cooler for Friday and Saturday.
The offshore long wave trough has sheared, leaving a cutoff low near 32N 130W. The residual trough is now moving into the Pacific Northwest, and it isn't doing much of anything at this time. High clouds and patchy late night into early morning low clouds and fog/freezing fog will be the story over inland areas into Saturday.
The air mass will remain quite dry, while the large high pressure drifts through low to mid Mississippi and Ohio rivers valleys. Warm advection deepens down to the sfc today, with high temperatures rising into the low to mid 30s.
Strong high pressure will maintain mainly clear skies across central Indiana through the first half of the weekend with a gradual warming trend as well.
329 AM EST Fri Feb 21 2020 Cold high pressure will build into the forecast area from the northwest today.
839 PM MST Thu Feb 20 2020 Temperatures will trend warmer through the weekend.
352 AM EST Fri Feb 21 2020 High pressure building across the northeast will bring clearing skies and milder temperatures to NY and PA this weekend. Building high pressure will cause skies to clear today, especially during the afternoon. As winds shift to the south on the back side of the high pressure system Saturday, temperatures will rise to near 40 degrees along the NY/PA border.
N-ly winds will also gradually diminish further through the night and FRI as high pressure settles in over the region, turning more out of the NE then becoming light and variable toward and after 00Z SAT.
1010 PM CST Thu Feb 20 2020 High pressure will give way to an increase in southwesterly winds on Friday.
It's possible for some freezing fog and low stratus to develop in the Umpqua Basin overnight, but confidence is too low to include in the TAF. If the lower conditions do develop, conditions should improve to VFR by late morning. The offshore long wave trough has sheared, leaving a cutoff low near 32N 130W. The residual trough is now moving into the Pacific Northwest, and it isn't doing much of anything at this time. High clouds and patchy late night into early morning low clouds and fog/freezing fog will be the story over inland areas into Saturday.
918 PM MST Thu Feb 20 2020 Think the high clouds drifting through the region will keep temps a few degrees warmer than past couple of nights. High pressure remains in control over East Idaho through tonight. Generally dry conditions in the lower levels is expected to preclude development of stratus/fog overnight, much like last night/this morning.
228 AM CST Fri Feb 21 2020 High pressure will sink south of Illinois today allowing southwest winds to bring warmer air into central Illinois.
200 AM EST Fri Feb 21 2020 High pressure will maintain dry conditions, with moderating temperature through the weekend. Plenty of sunshine will be seen during the day as a sprawling area of high pressure builds into the Ohio Valley. High temperatures will moderate as compared to yesterday with the departure of the 850mb thermal trough, but values will still end up a few degrees below climatology. That large high pressure center will slowly drift southeast through the weekend, with low-level ridging remaining in place.
1044 PM EST Thu Feb 20 2020 High pressure will maintain dry conditions, with moderating temperature through the weekend.
1136 PM EST Thu Feb 20 2020 High pressure will maintain dry conditions, with moderating temperature through the weekend.
Luckily, temperatures will quickly rise above freezing by mid-morning, and with full sunshine most if not all of the ice and snow will quickly melt by afternoon. VFR will continue through the next 24 hours as dry high pressure moves into the area.
Northerly winds are beginning to advect colder and drier air across the area allowing temperatures to begin dropping below freezing during the next several hours. High pressure will bring VFR flight conditions to the area through the next 24 hours with clear skies and light winds out of the north and east. Diegan Chattanooga Airport, TN 26 44 25 55 31 / 10 0 0 0 0 Knoxville McGhee Tyson Airport, TN 24 40 22 52 28 / 30 0 0 0 0 Oak Ridge, TN 24 42 22 52 28 / 10 0 0 0 0 Tri Cities Airport, TN 21 39 19 51 25 / 30 0 0 0 0.
212 AM EST Fri Feb 21 2020 High pressure building across the northeast will bring clearing skies and milder temperatures to NY and PA this weekend. Building high pressure will cause skies to clear today, especially during the afternoon. As winds shift to the south on the back side of the high pressure system Saturday, temperatures will rise to near 40 degrees along the NY/PA border. Overall, a very quiet short term period is in store as high pressure will be in control.
1212 AM EST Fri Feb 21 2020 A large ridge of high pressure will move over the region tonight and bring very chilly low temperatures from 5 degrees above zero to around 10.
Expect winds to veer from southwest to westerly as the weak trough shifts through tonight and Friday morning. Currently, upper level ridging, accompanied by dry westerly flow at mid levels and dry southwesterly surface winds allowed temperatures to climb into the upper teens, 20s and 30s across nearly all of western and central North Dakota. Warmer on Friday with highs from the low to mid 30s along, north, and east of the Missouri River.
Between high pressure to the SE and a High Plains lee trough, there will be a decent pressure gradient across the FA. There will be a light downslope SSW wind through the overnight, so lows near the Oklahoma border may not fall much from freezing. On Saturday, lee troughing will prevail. Winds will be a bit breezy though as the trof axis continues across western Kansas.
A quiet night is currently being observed across the area as northerly winds continue to advect a cooler and drier airmass. GOES Nighttime Microphysics imagery shows mostly clear skies with the exception being across the higher terrain of eastern Tennessee and parts of SW Virginia where higher low level moisture resides. Subsidence will continue to keep skies clear with cooler temperatures as highs reach the mid/upper 30s to mid 40s.
Complicating how fast the low clouds will burn off is mid and high-level cloud cover which could limit mixing through the day. With this in mind, went a few degrees cooler than guidance on highs for today. We should see the clouds eventually dissipate and mix out by late tonight as the ridge moves overhead and slightly drier air works into the region.
1106 PM CST Thu Feb 20 2020 High pressure over Iowa will bring one more night of cold weather under clear skies.
The highest winds will remain along the coast into the early morning hours. /issued 329 PM CST Thu Feb 20 2020/ This afternoon's GOES-16 water vapor imagery indicates an upper level trough is continuing to slowly progress eastward across the Southern Plains and Lower Mississippi River Valley. As the trough axis approaches and moves east of the CWA, upper level support for overrunning precipitation will decrease and result in showers coming to an end.
335 AM CST Fri Feb 21 2020 Latest upper air analysis shows ridging over the rockies pushing into our region over the next day or two. At the surface, high pressure slides southeastward this morning and we're experiencing some breezy WAA keeping temps from dropping too much from radiational cooling.
411 AM CST Fri Feb 21 2020 The main issue in the short term is with the highs for today and Saturday. A weak upper level ridge starts to move into the area today and should help to bring warmer, drier conditions to the area, so did warm up temperatures slightly across southwest Nebraska. Did adjust temperatures cooler than guidance across portions of north central Nebraska extending back into the Sandhills, where satellite still shows a good swath of snow on the ground.
517 AM CST Fri Feb 21 2020 The main issue in the short term is with the highs for today and Saturday. A weak upper level ridge starts to move into the area today and should help to bring warmer, drier conditions to the area, so did warm up temperatures slightly across southwest Nebraska. Did adjust temperatures cooler than guidance across portions of north central Nebraska extending back into the Sandhills, where satellite still shows a good swath of snow on the ground.
The region is currently (09z) in the warm sector of a northern system with the thermal ridge overhead. This thermal ridge will advect southward this morning as a weak cold front propagates through the region by 15z. Will go with daytime highs near or slightly above freezing, with the possibility for even warmer temperatures.
409 AM CST Fri Feb 21 2020 High pressure is well southeast of the area today, allowing for increasing low level southwest flow. Temperatures will respond by warming into the low/mid 30s, although given the brisk winds, it won't feel "warm. " Given winds in the 20-25 mph range with gusts into the lower 30s from west into south central MN, patchy blowing snow will be possible as well.
For 12Z Aviation discussion below High pressure is well southeast of the area today, allowing for increasing low level southwest flow. Temperatures will respond by warming into the low/mid 30s, although given the brisk winds, it won't feel "warm. " Given winds in the 20-25 mph range with gusts into the lower 30s from west into south central MN, patchy blowing snow will be possible as well.
Strong northerly winds will gradually weaken through the day as the center of cold high pressure advances closer to the area. with low dew points and clear skies temperatures will fall into the upper 20s across central Louisiana with freezing temperatures as far south as the I-10 corridor around sunrise tomorrow.
Warmer still by Saturday, with south winds returning and highs expected to reach the 50s for all areas.
Winds will decrease tonight as a ridge of high pressure builds into the region. The ridge axis will reside over our far western counties late tonight into Saturday morning, which could lead to patchy fog/stratus development, aided by low-level moisture from any snowmelt that occurs today.
High temperatures will range from the low to mid 40s today, and winds will be gusty at times through the mid afternoon hours.
515 AM CST Fri Feb 21 2020 Something we don't see all that often at any time of year - an expanse of clear skies all throughout the region, with really the only feature of interest over the Lower 48 being a departing snow event over the Carolinas/southeastern Virginia. Closer to home, low level ridging rules the roost but continues to slide into the Mid Mississippi River Valley, with a tighter pressure gradient developing across the local area north of that feature. That setup will result in increasingly gusty conditions today, but with better mechanical mixing also delivering warmer conditions, though with gusts to 25+ mph at times, it might not feel all that warm.
With southwest flow increasing through the day high level clouds will also begin to overspread the area which may prevent mixing and hence keep the lower cloud deck in place for much of the day and therefore have extended the timing of the low cloud mention. Southerly winds will also become a bit breezy this afternoon in response to lee troughing. Complicating how fast the low clouds will burn off is mid and high-level cloud cover which could limit mixing through the day. With this in mind, went a few degrees cooler than guidance on highs for today. We should see the clouds eventually dissipate and mix out by late tonight as the ridge moves overhead and slightly drier air works into the region.
Current water vapor satellite shows a large scale upper trough over the Piedmont, an upper low off the California coast, and upper ridging between these features over the southern Rockies. At the surface, high pressure is present from W TX into IL as heights build in the wake of the eastern trough. For Saturday, as the upper low moves over S CA, flow aloft over the forecast area will become southwesterly while low level winds remain largely southerly.
Precip is done for a couple of days, but temperatures have plummeted into the low to mid 20s. Afternoon temps will be close to 40 on the Plateau and in the low 40s elsewhere.
637 AM EST Fri Feb 21 2020 High pressure building across the northeast will bring clearing skies and milder temperatures to NY and PA this weekend. Building high pressure will cause skies to clear today, especially during the afternoon. As winds shift to the south on the back side of the high pressure system Saturday, temperatures will rise to near 40 degrees along the NY/PA border.
/TW/ Today and Tonight: Southern stream flow will remain in place across the CONUS through the short term period with a trough axis pushing off the East Coast and into the Atlantic while a cutoff closed upper-level low is progged to move into southern California. A ridge axis will reside between these two features and remain situated upstream over the Rockies with northwest flow aloft over the ArkLaMiss. Winds will gradually relax through the day as the aforementioned ridging slides into the area. Overnight low temperatures were lowered into the low to mid 20s with the coldest readings expected across northeast portions of the area in favored locations for efficient cooling.
/issued 342 AM CST Fri Feb 21 2020/ (Today and Tonight) Quiet, dry weather for the next 24 hours with cooler than normal temperatures. as upper level ridging moves over the area. We may see some mid/upper level clouds riding over the ridge move in over our area, but otherwise mostly sunny skies. However, we will remain cooler than normal with winds just turning around to the south late in the day.
332 AM CST Fri Feb 21 2020 Precip is done for a couple of days, but temperatures have plummeted into the low to mid 20s. Afternoon temps will be close to 40 on the Plateau and in the low 40s elsewhere.
/Today through Saturday/ Arctic high pressure continues to build southward across the region this morning and will remain the dominant feature through the short term period on Saturday. Fortunately, northerly winds will gradually decrease throughout the day as the center of the high settles closer to the Ark-La-Tex so wind chill values shouldn't be too far off from ambient temperatures by this afternoon. Regardless, it appears sub-freezing temperatures will encompass the entire region by early Saturday morning before southerly winds take hold areawide later in the day.