Aikyam-Lab/Synoptic-Bench huggingface dataset:
An upper trough dropping into the Southern Appalachian Region will rotate in bands of low clouds and an occasional shower throughout the TAF period. Near surface temperatures are expected to remain above freezing for little to no accumulations. With the upper trough moving in.
Can find no compelling reason to make significant adjustments to ongoing forecast for tonight, with a changeover to snow still expected and the significant accumulations expected to be mainly in the higher terrain. Chattanooga Airport, TN 34 48 32 55 / 50 10 0 0 Knoxville McGhee Tyson Airport, TN 36 40 30 50 / 80 50 20 0 Oak Ridge, TN 36 41 29 52 / 80 50 10 0 Tri Cities Airport, TN 35 39 27 47 / 100 80 40 0 TN.
South winds will gust over 20 KTS mid to late morning Wednesday as lee trough develops. Skies will be mostly sunny on Wednesday, with warmer temperatures. With development of a lee trough across New Mexico and tightening surface pressure gradient across our area, south-southeast winds will increase Wednesday morning and become gusty. (Wednesday night through Tuesday) A dry and warm weather pattern will persist across the area through the end of the week as upper level ridging moves east across the Rockies and into the Plains.
Clearer skies and warmer temperatures are forecast for tomorrow. At the surface, an elongated meridional ridge axis stretched from the eastern Dakotas to the Texas Gulf coast. With the H850 ridge axis not clearing the CWA until late in the day tomorrow, WAA will not be terribly strong. That being said, while many solutions have backed down slightly on highs, leveraged the warmer BC grids for highs tomorrow to account for the models' recent tendency to under-forecast highs by several degrees on days with little cloud cover.
711 PM CDT Tue Mar 20 2018 For the 21/00Z TAF period, VFR conditions prevail this period as stratocu continues to depart our eastern terminal sites with upper low ejecting NE away from the region.
/Issued 323 PM EDT Tue Mar 20 2018/ The upper level low over the Carolina's will begin to lift northeastward as the surface front continues to push away from the forecast area. Forecast soundings support a mixture of rain and snow with all snow across the higher elevations.
The high wave heights will also gradually fall during this period. Medium Low pressure in the southeast US will continue to pull into the eastern seaboard this period. However, low level thermal trough amplifies a bit which will combine with the onshore flow to generate some lake clouds.
Snow is expected to continue through part of the day as low pressure crosses the OH Valley and Mid Atlantic regions. Below-average temperature is expected to persevere as nwly flow supplies a steady source of cooler air. It does appear that the nrn-stream ridge building in the Great Lakes region over the weekend could limit its influence on the Ohio Valley, but a wintry mix is not out of the question.
722 PM EDT Tue Mar 20 2018 Strong upper trough along with a surface cold front will move through the area overnight.
937 PM EDT Tue Mar 20 2018 Low pressure is currently emerging from the coast of South Carolina. High pressure will continue to build in from the west. The gradient will be tight between the building high and departing low pressure, so winds are expected to stay up overnight with a good bit of mixing. Tweaked the pops a little bit, as isolated showers continue as the long wave trough continues to move through. /Issued 323 PM EDT Tue Mar 20 2018/ The upper level low over the Carolina's will begin to lift northeastward as the surface front continues to push away from the forecast area. Forecast soundings support a mixture of rain and snow with all snow across the higher elevations.
The moisture will overspread the rest of our CWA Wednesday morning as a warm front moves in from the southwest.
917 PM CDT Tue Mar 20 2018 Surface and upper-ridge to influence weather conditions overnight with temperatures forecast to fall into the upper 30s to lower 40s across the region. /issued 711 PM CDT Tue Mar 20 2018/ For the 21/00Z TAF period, VFR conditions prevail this period as stratocu continues to depart our eastern terminal sites with upper low ejecting NE away from the region.
Chilly conditions for the first day of Spring will continue in the near term as persistent upper troughing/northwest flow remains over the Midwest. As the upper low quickly shifts toward the central Appalachians by daybreak, drier air will move into the area resulting in decreasing clouds and continued cool temperatures in the mid 40s across most of the area.
805 PM EDT Tue Mar 20 2018 After one of the more active weather days we've seen in quite some time across west-central and SW Florida, skies are quickly clearing across the area as a cold front is pushing through the region. Behind the front, much cooler and drier air will infiltrate the region with a fairly cool day expected for your Wednesday. Winds and seas will continue to increase this evening as the cold front pushes through the waters and high pressure starts to build into the area.
752 PM EDT Tue Mar 20 2018 An area of low pressure will bring snow to the region this evening and through the day on Wednesday.
742 PM EDT Tue Mar 20 2018 An approaching line of TS, ahead of a cold front, will move across the northern half of S Florida this evening. VFR behind the cold front passage late tonight. As the upper level low lifts northeast this afternoon and loss of daytime heating continues, the window for potential strong storms will gradually close for most areas except portion of the north over Glades County and the Lake region late this afternoon and early evening. Although there is a relative unstable atmosphere in place with dewpoints in the low to mid 70s across the region, this low lifts northeast with subsidence behind it lowering the threat for strong storms late tonight.
/Issued 318 PM CDT Tue Mar 20 2018/ Cloud scattering out this afternoon as the upper trough axis to the east continues to move away from the area. Clear skies and light winds overnight will make for a chilly first night of spring, but warmer temperatures will be in the offing as high pressure begins to move east and southerly winds return for the latter portion of the work week.
955 PM MDT Tue Mar 20 2018 A swift flow aloft continue to feed moisture into the state from the northwest this evening resulting in areas of light snowfall in the high country, mainly along and west of the Continental Divide Snowfall rates have been on the light side and should remain that way for the remainder of the night. Furthermore, the high clouds streaming over the plains this evening is expected to thicken overnight, and possibly lower after midnight. Accumulations are expected to be under an inch or two along the higher passes. Wednesday will be warmer with lighter winds.
Weak short wave trough currently moving through the region will shift to the south and east tonight, bringing any light snow to an end across the southern portion of the area.
822 PM MDT Tue Mar 20 2018 Quiet weather over the region as heights are starting to build ahead of a ridge that will build into the region Wednesday.
617 PM CDT Tue Mar 20 2018 Dry with VFR continuing under northwest flow aloft - large upper ridge over the southwestern U.
Cold front sweeping southward through the CWA with more significant advection of cooler air later tonight, as lower temps are lagging the much lower dew points by several hours. Dry, breezy/windy and cooler conditions will occur Wed behind the front then remaining dry and cooler than normal into the end of the workweek as a continental ridge across the central U. High pressure then shifts offshore of the Southeast U.
735 PM EDT Tue Mar 20 2018 Strong upper trough along with a surface cold front will move through the area overnight.
With high pressure lingering over the region, skies will remain clear and VFR conditions will prevail through the period. As the high pressure systems slides further east in the morning, winds will veer more to the southeast and become breezy between 15z-17z. The high will begin to slide east this evening through Wednesday with winds becoming more east to southeast in the process. For Wednesday, a warm yet pleasant day is expected under mostly sunny skies, with temps slightly warmer in the upper 70s across the Coastal Plains to lower 80s across the Brush Country. Wednesday night will still be cool, but temperatures will be slightly warmer when compared to tonight, with lows in the mid 50s to mid 60s.
642 PM CDT Tue Mar 20 2018 Chilly conditions for the first day of Spring will continue in the near term as persistent upper troughing/northwest flow remains over the Midwest. As the upper low quickly shifts toward the central Appalachians by daybreak, drier air will move into the area resulting in decreasing clouds and continued cool temperatures in the mid 40s across most of the area.
719 PM EDT Thu Sep 7 2017 A deep upper-level trough will influence our weather for the next several days.
720 PM EDT Thu Sep 7 2017 High pressure with dry and cool weather for the remainder of the week. A rather tranquil fall like scenario with high pressure of Canadian origin continues to dominate our weather with mostly dry and cooler than normal conditions. This puts a track through the southern Appalachians towards the lower to middle Ohio Valley.
1013 PM EDT Thu Sep 7 2017 A cold front will exit the area this afternoon. A weak ridge of high pressure will cross the area tonight.
Scattered showers are expected into tonight in the cyclonic flow from a large mid/upper level trough over the Great Lakes region. Scattered showers will continue tonight with southern Wisconsin in a baroclinic zone, along with the cyclonic flow from a large mid/upper level trough over the Great Lakes region.
826 PM CDT Thu Sep 7 2017 High pressure is just to our north over the OH Valley and will help to keep conditions very similar to last night.
637 PM CDT Thu Sep 7 2017 Quiet weather will continue, as the cool and deep upper trough slowly shifts eastward. After one more cooler morning, with lows close to 50, some lower 80s are expected by afternoon over the southwest CWA. Through the weekend, the Midwest will remain under the influence of high pressure over the Great Lakes.
Major Hurricane Irma is forecast to impact east central Florida A weak frontal boundary/trough will still stall and begin to dissipate across east central FL through the late night hours. This will allow for low level onshore in with fairly deep moisture in the low to mid levels with PWATS averagaing from 2. While we might normally be looking at a Small Craft Advisory for Seas by tonight, given the high bias of the wave models coupled with the likelihood of the eventual issuance(s) of tropical cyclone watches for at least part of the local waters by tonight, it is prudent to hold off on that, and simply mention large swells out ahead of the approach of dangerous major Hurricane Irma.
1033 PM EDT Thu Sep 7 2017 The North Country will continue to be influenced by a deep upper level trough through the first half of the weekend.
1053 PM MDT Thu Sep 7 2017 Dry northwesterly flow aloft continues this afternoon as the forecast area remains between an upper ridge over the western CONUS and an upper trough over the east. At the surface, a weak area of low pressure exists over the west with high pressure over the midwest and southeastern states. Temperatures will be slightly warmer than average.
As the upper trough makes slow eastward progression overnight, expecting the showers and cloud cover to gradually diminish behind it. Temperature forecast remains largely on track with lows in the lower to middle 40s. Water vapor imagery and surface analysis reveals slow moving deep short wave troughing across the Great Lakes/Ohio Valley into New England. A large upper level ridge of high pressure currently over the intermountain west will move east and lead to building heights across the western Great Lakes through the period.
1214 AM EDT Fri Sep 8 2017 Cool weather and shower chances can be expected until high pressure builds this weekend. Weak disturbance will cross through the broad upper-trough before it departs the area Friday evening. High pressure at the surface and northwest flow aloft will bring dry weather with stunted temperature moderation.
Otherwise, expect lows in the low to mid 50s with light winds. High pressure is over east Arkansas this afternoon. As the high moves slowly east tonight, skies will remain clear tonight. High pressure will remain over much of the eastern U.
Showers and thunderstorms will track northward through the night accompanying a passing upper trough.
Upper trough axis is slowly lifting out of the area with high pressure in control at the surface through the short term. Also, tried to reflect the decoupled valleys again tonight, so have a split between our typical cool spot around the mid 40s, and the other warmer spots in the upper 40s and low 50s. As the upper trough lifts out, we'll see a rise in heights/thicknesses on Friday along with plenty of sunshine, which will allow high temps to warm more into the mid and even a few upper 70s.
Deep trough in the eastern United States and sharp ridge in the Rockies was supplying pleasant conditions across the dvn cwa, due to a northwest flow aloft. A cold front stretched from northern MN to central WI and into northern lower MI. A back-door weak cold front (more of a wind shift line) will drop southwest to about Highway 20 by sunrise and then stall. Friday: Northwest flow aloft continues as the center of a Canadian high pressure system settles into the Lake Superior/Upper MI region. Therefore, highs should range from the upper 60s at Freeport, IL to the lower 80s at Memphis, MO.
913 PM CDT Thu Sep 7 2017 Scattered showers will continue tonight with southern Wisconsin in a baroclinic zone, along with the cyclonic flow from a large mid/upper level trough over the Great Lakes region.
859 PM EDT Thu Sep 7 2017 Cool weather and shower chances can be expected until high pressure builds this weekend. Upper-level trough axis swings over us later today, expanding downlake clouds and showers. This is in response to multiple ripples passing through the mean resident trough with cold mid-level temperatures holding. Lows tonight will again be cooler than average, but with increased clouds expected, may be a few degrees warmer than this morning's readings. Weak disturbance will cross through the broad upper-trough before it departs the area Friday evening. High pressure at the surface and northwest flow aloft will bring dry weather with stunted temperature moderation.
1149 PM CDT Thu Sep 7 2017 At 3 PM, a short wave trough was moving southeast through Wisconsin.
813 PM EDT Thu Sep 7 2017 The higher based cumulus is drying up quickly across eastern Kentucky this evening, as high pressure will be building in a bit stronger at the surface and aloft tonight. Also, given the comparable dew points between yesterday and today, have allowed for low temperatures near, if not a touch cooler than this morning in places. The near term portion of the forecast will feature continued cooler than normal temperatures and dry and pleasant weather across eastern Kentucky. Based on the expected conditions, valley locations should see temperatures falling into the low to mid 40s by early Friday morning, while the surrounding ridges only fall into the upper 40s. Highs on Friday are forecast to only make it into the lower 70s.
1134 PM CDT Thu Sep 7 2017 Subsidence from a persistent upper ridge overhead will continue to provide clear skies and benign weather across the forecast area for the next few days.
843 PM EDT Thu Sep 7 2017 Cooler and drier air continue into the weekend. High pressure centered over the TN Valley will continue to ridge into the area overnight. The near term will remain relatively quiet with high pressure over the area and Irma still well away from the region. Cooler than normal temperatures will continue, and with a dry airmass still in place, do not expect any rainfall.
1030 PM EDT Thu Sep 7 2017 High pressure with dry and cool weather for the remainder of the week. A rather tranquil fall like scenario with high pressure of Canadian origin continues to dominate our weather with mostly dry and cooler than normal conditions. This puts a track through the southern Appalachians towards the lower to middle Ohio Valley.
Rain ends and clouds exit the region tonight as high pressure builds across the Upper Great Lakes into Friday. Warmer Friday with highs in the low to mid 60s and sunny skies. Winds will become nearly calm as high pressure builds in, and while skies should remain mainly clear overnight there is a risk for fog/stratus to develop across portions of the Northland. This wind direction will result in slightly cooler temperatures along the north shore, but otherwise highs in the low to mid 60s expected.
507 PM MDT Thu Sep 7 2017 Dry northwesterly flow aloft continues this afternoon as the forecast area remains between an upper ridge over the western CONUS and an upper trough over the east. At the surface, a weak area of low pressure exists over the west with high pressure over the midwest and southeastern states. Temperatures will be slightly warmer than average.
604 PM CDT Thu Sep 7 2017 Quiet, seasonal weather is expected over the next 24 hours, as the Northern Plains remains in a weakly forced environment between a sharp upper level ridge over the western U. and a deep trough over the East. Forecast temperatures for Friday remain similar to those observed Thursday, save for east central South Dakota into southwest Minnesota, which could be a few degrees cooler. This will result in winds taking on a more southerly component, and with sustained speeds of around 10 kts lows will be close to 60 through south central SD and the MO River corridor, trending downward to the lower 50s over southwestern MN and IA Great Lakes area.
Surface ridging across the area will produce light winds, generally less than 10kts.
758 PM EDT Thu Sep 7 2017 A deep upper-level trough will influence our weather for the next several days.
/issued 253 PM CDT Thu Sep 7 2017/ SHORT TERM (Now through Friday): The most recent surface analysis from the Weather Prediction Center places a cold front across the Gulf of Mexico from northern Florida to the offshore waters of Tamaulipas in Mexico. This will result in increasing cloudiness during this time period with isolated showers over the Lower Texas coastal waters and immediate three coastal counties tonight, and then along and east of the Interstate 69C corridor on Friday. The passage of the aforementioned cold front and increasing cloudiness are expected to hold temperatures at near normal values through the entire short term forecast period.
Cooler and breezy weather will prevail for the weekend thinning the smoke out. Will be monitoring visibilities down in the lower Columbia Basin this evening to get a better idea on the degree of improvement coming our way.
Elsewhere, lows will be in the low to mid 70s. Northeasterly winds will increase on Friday as the pressure gradient between Hurricane Irma and high pressure to the north tightens.
/issued 357 PM CDT Thu Sep 7 2017/ An amplified upper ridge over the Rockies and a longwave trough over the Eastern United States has resulted in a dry northwest flow aloft over the region.
An upper level trough along the coast will continue to bring occasional light showers to the area tonight into early Friday morning. Onshore flow will keep temps cooler through the end of the week and into the weekend and also help to gradually clear out the smoke.
Quiet weather will continue, as the cool and deep upper trough slowly shifts eastward. After one more cooler morning, with lows close to 50, some lower 80s are expected by afternoon over the southwest CWA. Through the weekend, the Midwest will remain under the influence of high pressure over the Great Lakes.
709 PM EDT Thu Sep 7 2017 Somewhat drier air will continue to filter into the area tonight behind an exiting cold front.
1022 PM CDT Thu Sep 7 2017 Quiet, seasonal weather is expected over the next 24 hours, as the Northern Plains remains in a weakly forced environment between a sharp upper level ridge over the western U. and a deep trough over the East. Forecast temperatures for Friday remain similar to those observed Thursday, save for east central South Dakota into southwest Minnesota, which could be a few degrees cooler. This will result in winds taking on a more southerly component, and with sustained speeds of around 10 kts lows will be close to 60 through south central SD and the MO River corridor, trending downward to the lower 50s over southwestern MN and IA Great Lakes area.
A negatively tilted upper ridge over the western U. Moisture has been gradually increasing over southern Colorado the past couple days, but is being held over those areas by the nearly stationary ridge axis. As the sharpness of the ridge relaxes some overnight and Friday, a little bit of this moisture will move over central Colorado and be in place to fuel afternoon thunderstorms over the mountains tomorrow. The upper level ridge over the intermountain west will progressively move eastward through the weekend. A deepening trough over the west will be pushing south helping to usher in increasing subtropical moisture into the four corners region and Colorado.
629 PM CDT Thu Sep 7 2017 Aloft: Weakening NW flow was over the Cntrl Plns with a ridge over the Wrn USA and a trof in the E. The Wrn ridge will be forced E over the Plns thru tomorrow. The last 2 runs of the NAM/GFS/RAP/EC suggest some spotty shwrs and embedded tstms will develop over Wrn/Cntrl KS at the nose of the low-lvl jet. Svrl degs warmer than today. it appears the high/ridge will be nudged over the Plns as a deep trof moves onshore in the W. Temps will average just a touch warmer than normal.
810 PM EDT Thu Sep 7 2017 The North Country will continue to be influenced by a deep upper level trough through the first half of the weekend.
Temperatures have dropped into the mid 60s across most of the region except for central Louisiana where temperatures have already fallen into the low 60s. VFR tonight into tomorrow as high pressure will dominate the region. Upper level ridging will build across the region through the weekend keeping any chance of Irma making any kind of headway into the gulf at a minimum.
High pressure shifting east and lee troughing to the west of the area will allow southerly flow to develop after 15-16Z.
732 PM EDT Thu Sep 7 2017 Cool weather and shower chances can be expected until high pressure builds this weekend. Upper-level trough axis swings over us later today, expanding downlake clouds and showers. This is in response to multiple ripples passing through the mean resident trough with cold mid-level temperatures holding. Lows tonight will again be cooler than average, but with increased clouds expected, may be a few degrees warmer than this morning's readings. Weak disturbance will cross through the broad upper-trough before it departs the area Friday evening. High pressure at the surface and northwest flow aloft will bring dry weather with stunted temperature moderation.
739 PM EDT Thu Sep 7 2017 An upper level trough will gradually begin to move out the region tonight into Friday. High pressure and dry conditions are then expected for the weekend. Slightly warmer temperatures around 50 degrees will be present along and south of the Ohio river Friday night. High pressure will remain in place across the region through the weekend.