Aikyam-Lab/Synoptic-Bench huggingface dataset:
1244 PM EDT Sat Jun 24 2017 A trough of low pressure will remain across the Great Lakes today and tonight. Sunday a cold front will swing east across the region.
The remnants of Cindy are interacting with a southward moving cold front this morning with much of the area experiencing shower activity. This general scenario should continue today with the highest rain chances shifting southward through the day.
1009 AM EDT Sat Jun 24 2017 Following a cold frontal passage earlier this morning, high pressure will begin to build back into the region through the day.
1007 AM EDT Sat Jun 24 2017 Cold front is draped at this hour across eastern TN SWrd through northern AL and central MS.
931 AM EDT Sat Jun 24 2017 Following a cold frontal passage earlier this morning, high pressure will begin to build back into the region through the day.
PoPs currently confined to the higher terrain this afternoon, and limited at that. There is a notable shift Sunday night as the ridge begins to flatten as it starts to move into central Montana. This allows a lee side trough to begin forming along the leeside of the Canadian Rockies and the easterly surface flow becomes more southerly across the western sections of the region. This allows temperatures to be slightly warmer overnight.
1004 AM EDT Sat Jun 24 2017 A trough of low pressure will remain across the Great Lakes today and tonight. Sunday a cold front will swing east across the region.
1039 AM EDT Sat Jun 24 2017 Forecast is largely on track as a cold front continues to move across the area. Chattanooga Airport, TN 86 64 83 60 / 50 10 0 10 Knoxville McGhee Tyson Airport, TN 84 62 80 57 / 40 0 0 10 Oak Ridge, TN 85 62 81 57 / 30 0 0 10 Tri Cities Airport, TN 83 60 78 54 / 40 0 10 10.
Surface obs and radar imagery show the cold front has cleared the forecast area so will remove pops from the forecast.
By later this afternoon additional weak trough line will approach the intl border, so the idea of scattered showers/isolated storms far north later in the day into this evening still looks on track. Today through tonight a full latitude upper trough deepens across the east central US with southwest flow over the northeast. 850 mb temps support a few degrees warmer, however clouds around should limit the potential. Cooler temperatures tonight, with lows in the 50s.
1227 PM EDT Sat Jun 24 2017 One cold front has passed east, and a secondary cold front will pass tonight.
710 AM EDT Sat Jun 24 2017 Cold front is moving through all terminals this morning bringing MVFR to possible IFR conditions in heavy rainshowers and thunderstorms. Conditions begin to improve greatly by early afternoon as the front pushes east of the area and high pressure dominates the latter half of the period.
/NF/17/ Today through Tonight: Latest satellite imagery showed a broad upper trough axis over the Central CONUS. Highs today will be in the lower to middle 80s. Lows for tonight will be from the middle 60s north to the lower 70s south.
MVFR cigs are following a cold front into the area, having cleared the I-20 areas around KABI already. Additional showers and thunderstorms are developing along and behind a cold front which is currently moving into the Big Country. Much cooler temperatures and gusty northeast winds are expected behind the front. West Central Texas will be in northwest flow aloft, as an upper level ridge remain centered over Arizona/northern Mexico.
/issued 333 AM CDT Sat Jun 24 2017/ A cold front has moved through the Midsouth, currently located along a line from Greenwood, MS to Columbus Air Force Base to Jasper, AL. At Walnut Ridge, AR and Pine Bluff, MO, dew points are in the low 60s.
1151 AM EDT Sat Jun 24 2017 Cooler and drier air continues to filter into the area on northwest winds. This will just be the beginning of a stretch of cool dry weather with even cooler and drier air on the way to start the new week.
/issued 345 AM CDT Sat Jun 24 2017/ A surface cold front is located as of 24/07Z from roughly north central Texas to the Louisiana/Arkansas border. With the high moisture content and winds at 85H-70H rather light and parallel to the front, convection will be slow moving with the possibility of training.
Sfc analysis shows the high pres ridge across central FL area and wern ATLC with a light west to southwest sfc flow. Mid levels of the airmass are warmer and drier than yesterday but low levels remain moist. One with the west coast sea breeze/low level convergence over the south/southwest zones, and another with pre-frontal trough across SE GA as mostly depicted by NAM. looking for highs in the lower to mid 90s.
1108 AM EDT Sat Jun 24 2017 A cold front crosses the local area today.
A Denver cyclone is helping to keep lower clouds and hazy conditions over the urban corridor while the high country remains dry under the upper level ridging. Still expecting a slight chance of showers and a weak thunderstorm or two over the higher terrain south of I70 later this afternoon into the early evening. An upper level ridge over the Desert Southwest and a large trough over the Great Lakes will produce a northwest flow aloft today. The airmass temperature doesn't change much today, but more sun will result in warmer high temperatures. On Sunday upper level high pressure will be centered over southern Arizona. with an upper level trough of low pressure covering much of the central and eastern United States. isolated to scattered afternoon and evening showers and storms will be possible over the higher terrain where greater instability exists.
A complicated weather day across the Northland, with a mix of drizzle, snow and an area of mixed rain/snow/freezing rain that has been making roads treacherous in spots. Ahead of the trough axis there is a deep layer of warm air advection and a band of frontogenesis along a baroclinic zone in the 850-700mb layer. South of the area of snow, lighter Later this evening and Sunday morning the trough axis will move east through the forecast area, bringing one last wave of precipitation through from west to east, then ending precipitation from west to east Sunday morning. Ahead of the trough, convergence and high low level moisture should produce areas of fog during the evening and overnight hours.
Temperatures this morning are mainly in the lower 70s, some 15+ degrees above climatological normals. For the remainder of today, expecting the fog to lift by mid morning as the winds mix in the boundary layer, leaving partly to mostly cloudy skies with afternoon temperatures in the lower to mid 80s, about 8-10 degrees above climatological normals.
Besides the showers, patchy fog has once again developed over the area early this morning, but not as widespread and dense as last night Otherwise, models show mid-level warming through the day as upper ridge strengthens over the Tennessee Valley.
A mild November night out there on this "fall back" Sunday, with lots of low stratus camped out across the area, in a very weak wind regime ahead of a developing cold front to our north/west early this morning. We continue to see some drizzle falling out of those clouds at times and in random spots where lift and moisture depth overlap, with some areas of fog also noted, particularly across central Wisconsin with wet ground from melting snow the past 24 hours and along the ridge tops (very typical this time of year).
Meanwhile, a strong cold front extended from northern MN to northern KS with temperatures in the 20s in the Dakotas. Today: Widespread dense fog should continue to about sunrise followed by improving visibilities, as a cold front begins pushing into the cwa. Tonight: Canadian high pressure will be nosing into MN bringing clearing skies to the dvn cwa this evening, with clear skies overnight.
The low clouds will start to lift mid morning, and like yesterday, there will be a mix of sun and clouds in the afternoon. A cold front will be taking shape over the Mid Ms Valley, increasing the pressure gradient across the region. Tonight, the cold front will approach from the northwest with a band of showers and thunderstorms.
As of early morning, the cold front had already reached DDC (as of 0830Z) and will continue sweeping south during the morning. Forecast challenges will be the extent and the longevity of the low clouds.
234 AM EST Sun Nov 5 2017 Weak low pressure moving through the area will trigger scattered showers today.
The rub will be if any precipitation falls first as rain, wetting roads, bridges and sidewalks and then quickly freezes as the temperature drops below freezing in the cold air advection behind the cold front. The dense fog (advisory) over the far northeast corner of the CWA has been slowly improving (per area webcams and surface obs), and now that the surface cold front has cleared the CWA, heading east through MN, the Dense Fog Advisory will be allowed to expire at 11 PM CDT. High pressure will settle over the region on Sunday with highs only the lower 30s expected.
Synoptically speaking, a ridge of high pressure was centered over the states of Tamaulispas and Zacatecas in Mexico is impacting much of the western and northern Gulf of Mexico.
Northeasterly low level flow will continue across the region today due to an inverted trough extending from the Bahamas to east of the coast today.
After that, expect another sunny day with highs in the low to mid 80s.
Heights will fall as as the weak ridge that was over the region yesterday continues to move off to the east and we transition to zonal flow through the day.
/issued 330 PM CDT Sat Nov 4 2017/ Mid-afternoon sfc analysis shows high pressure hanging over the sern CONUS, providing the area with a continued onshore low-level flow. Closer to home, as temps have continued to warm to the lower/mid 80s, a few showers have popped up as expected, otherwise a warm and partly cloudy day continues.
This is all in response to a warm sector airmass across the Ohio and Tennessee Valleys, downstream of a parent upper low sliding from Manitoba into Ontario. Further eastward progression of the upper low across Hudson Bay will shift the cold front into the Ohio Valley this evening into tonight, promoting an increasing chance of showers and thunderstorms through the night.
An upper trough extends from the BC/WA coast to Northern Alberta early this morning. The base of this trough will move inland across the Pacific NW today. Moisture ahead of this trough will move across the southern half of Montana tonight.
224 AM CST Sun Nov 5 2017 Patchy dense fog will prevail ahead of the cold front early this morning, mainly along/east of the Kansas turnpike. A brief period of drizzle and fog may also transition south with the front across the rest of the area this morning before the gusty north winds and cooler air begin to advect south in the wake of the front.
MVFR/IFR conditions will develop in most locations as the low stratus and patchy fog continue to move north across the region.
249 AM CST Sun Nov 5 2017 The cold front advancing toward Oklahoma has increased its speed from previous model runs and is expected to push south the strong maximum temperature gradient today. Temperatures in the lower 60s F.
403 AM EST Sun Nov 5 2017 Under mostly clear skies and light northeast to east winds, temperatures are holding in the lower to mid 70s along the island chain. Surface wise, a broad area of low pressure is hovering around the northwest Bahamas, with an elongated ridge axis draped along north Florida and the adjacent Gulf and Atlantic ocean. An east-west oriented surface area of high pressure will be aligned across the extreme southeastern United States and the Florida peninsula and the adjacent Atlantic and Gulf waters.
A flat upper ridge will remain in place through the short term with nearly zonal flow across the forecast area.
344 AM CST Sun Nov 5 2017 A cold front will move through the forecast area this morning with pre-frontal rain moving into nw Wi. High pressure then builds as drier and colder air moves in. Other than the cold temps that will struggle to climb above freezing, not much in terms of weather.
Fairly zonal flow aloft will exist across the Central Plains region today in the wake of an upper trough moving across western Ontario Canada and the Great Lakes region. To the west, an upper trough will dig into the Pacific Northwest.
303 AM CST Sun Nov 5 2017 Broad trough extended from the Pacific Northwest to MAN with an upper level jet along the northern states or on the southern periphery of upper trough. An upper level trough over MAN will move into eastern Canada on Mon. A cold front was located over eastern MN. Broad trough will take on a split flow regime with a short wave trough dropping southeast out of the Northwest Territories on Mon and another trough moving in from the Pacific Northwest on Mon. The midweek long wave pattern shows a persistent H5 trof across the central and eastern CONUS with a western H5 ridge axis pinned along the Northern Rockies.
433 AM EST Sun Nov 5 2017 An area of low pressure and associated cold front will approach the area today. The cold front will move through this evening into tonight. Cooler air will begin to filter into the region with the passage of the cold front.
That, and the cold advection will limit temperatures severely, and it will be a struggle to reach the freezing mark according to much of the guidance.
So far the lowest visibility at PNC has been 5SM. Next in a series of cold front will move into northwest parts of Oklahoma after sunrise Sunday and progress southward over at least the northern half of Oklahoma by mid- afternoon.
/Today through Tonight/ Confidence: High Series of fronts/troughs to pass through the region today. Low pressure in southern Canada will drive northeast toward Hudson Bay while trailing front moves east of the state by 18z. Secondary trough/weaker cool front over western Iowa will keep clouds and chances for a few light showers across the north/southeast into the mid morning hours. southern areas will likely see afternoon highs in the lower to mid 50s by mid to late afternoon. Northern areas will struggle to reach the lower 40s late today. Tonight most of the cloud cover will depart or remain west of the area as a ridge of high pressure slides southeast.
Mid and high clouds may prevent some of the low clouds from making it into KABI, but other areas will see a gradual deterioration of conditions overnight.
Despite the cloud cover a very warm day is in store as highs warm well into the 70s to the lower 80s. Gusty south to southwesterly winds will occur this morning into the early afternoon as gusts around 30 mph are expected ahead of an approaching cold front from the north. An upper level trough will spread across the Plains today and across the region tonight. As the trough spreads east a cold front will sag south into the area later this afternoon then across the area this evening. The cap should limit overall thunderstorm potential until the trough spreads east and height falls weaken the cap enough to allow storms to develop along the front late this afternoon into this evening.
At the surface, a cold front bisecting the forecast area as of 07z should move to our south by 12z with gusty northwest winds diminishing by this afternoon. Tonight, the zonal flow aloft will induce the development of a lee trough over the High Plains, and a resultant formation of a southerly LLJ on the backside of the departing surface anticyclone.
1111 PM CDT Sat Nov 4 2017 As anticipated by earlier shift, seeing a distinct difference in temperatures this afternoon between low stratus in our east and clearing ahead of the surface cold front in our west.
/issued 806 PM EDT Sat Nov 4 2017/ High pressure along the eastern seaboard will hold over the forecast area through the remainder of the weekend. Dry warm conditions will persist on Sunday with skies becoming partly cloudy and high temperatures in the lower to mid 80s.
A positive tilt upper trough will translate east across the northern plains tonight and into the upper Midwest by Sunday evening. A predominantly zonal upper level pattern will be in place for the period, with the breakdown of a broad ridge over the NE Pacific allowing a weak wave to press southward midweek.
356 AM CST Sun Nov 5 2017 Early morning surface analysis had a 1019mb ridge axis extending across our southeast zones from the northeast while a 1003mb low was centered over southern Kansas.
A broad upper ridge covers the southern U. ahead an approaching cold front now moving into the Mid Mississippi Valley. Expect breezy conditions ahead of the cold front with gusts to 25 mph across the Delta which will help mix out morning low clouds and produce some afternoon sun. Record highs for this date are in the lower 80s at Memphis, Jackson and Tupelo so more sun could result in some potential records.
Chattanooga Airport, TN 77 61 74 62 / 10 10 40 50 Knoxville McGhee Tyson Airport, TN 76 61 71 59 / 10 10 60 60 Oak Ridge, TN 76 61 70 59 / 20 30 60 70 Tri Cities Airport, TN 74 56 68 54 / 20 10 60 60.
Otherwise, after 13Z VFR conditions are expected as upper ridge suppresses convection development.
Under quasi-zonal flow aloft and the influence of a persistent 850mb thermal ridge, well above normal temperatures are expected areawide once again today. Given the persistent warm and dry conditions, increasing westerly winds this afternoon may yield a period of elevated fire weather conditions, mainly across the higher elevations of the Guadalupe Mountains and portions of the Southeast New Mexico Plains.
244 AM EST Sun Nov 5 2017 Weak low pressure moving through the area will trigger scattered showers today.
South and southwest winds will become gusty by late Sunday morning as surface pressure gradient tightens ahead of approaching cold front that will move through the MS/OH Valleys.
200 AM MST Sun Nov 5 2017 Current surface map shows high pressure axis across eastern Montana into western South Dakota.
Darkening in the WV imagery indicates location of upper trof axis roughly from Mono Co to MTR Bay and is moving Swd. Lingering showers over the Sierra should continue to wind down overnite, with nothing substantial over the Sierra with NWly flow aloft in the wake of the current trof and Pac NW trof.
121 AM EDT Sun Nov 5 2017 A warm front across the Tennessee valley will lift north, and move north of the forecast area Sunday morning. A strong cold front will move across the area Sunday night kicking off thunderstorms. Warm front just into SRN KY. Surge of moisture overnight combined with the warm front will produce showers after midnight tonight. but shear increases significantly as the 850mb winds increase to 55 kt by 00Z ahead of the cold front. GFS and ECMWF in good agreement moving the cold front into NW OH by 00z.
249 AM EST Sun Nov 5 2017 High pressure will build in from the north today.
406 AM EST Sun Nov 5 2017 A ridge of high pressure along the east coast will move offshore today allowing southerly winds to return.
THis is associated with the forcing along and ahead of the upper trough lifting across northwest MN at this time. Some indications of at least some remaining cloud cover over the eastern cwa into the evening before clearing takes place late as the high pressure system drops into Minnesota.
A broad upper trough was noted from the Pacific Northwest to the northern plains with one wave lifting into Ontario and a second wave moving into WA. At the surface, a cold front was moving towards the forecast area and was located from northwest KS through east central NEB. Models suggest there may be some differential vorticity advection within the westerly flow aloft, but with no axis to the low level moisture the dynamics appear insufficient to force showers or storms. The low clouds look to diminish with the dry air advection, but forecast soundings hang onto some saturation. Forecast soundings show wet bulb temps at or below freezing through the column. Since skies are unlikely to become clear, think overnight lows may hold in the lower and middle 30s.
340 AM CST Sun Nov 5 2017 A weak boundary is setting up over central Illinois this morning, with south/southwesterly winds ushering warmer temperatures and plenty of moisture into the southeastern portions of the state.
Temperatures will top out in the lower and perhaps even the middle 70s in the Colorado counties. For tonight, we will see rapid cooling where cloud cover is minimal with the Colorado counties falling sharply into the lower 30s. Highs temperatures will only reach the lower to middle 40s as CAA influences the region through much of the day.
The region will remain situated between strong high pressure centered over Mexico and strong low pressure centered near the Pacific Northwest.
GUY will see a cold front swing winds to the north for the day.
The cold front will move across srn WI from the late morning into the afternoon but the stronger cold advection will occur tonight. The cold front is associated with cyclogenesis that is occurring from western Ontario, Canada to srn Hudson Bay, Canada. Polar high pressure will build into MN by Mon AM with lows Mon AM mainly in the 20s.
The warm front in Missouri will eventually move back to the south, but not until Sunday evening.
423 AM EST Sun Nov 5 2017 A stalled warm front over the area this morning was responsible for areas of dense fog and drizzle. Low pressure and an associated cold front, will move through the region Sunday afternoon and evening, bringing a chance of showers and thunderstorms. Issued a dense fog advisory earlier for areas northwest of the initial warm front. Upper level support in the left exit region of a 110 knot upper level jet will translate over the existing warm front and provide plenty of lift for storms. Given the proximity of the front, low LCLs and the high amount of shear, tornadic potential is certainly possible.
cold high pressure nosing into the area this morning is forecast to slowly move east by noon then east of the area by days end. By mid to late afternoon the low clouds should dissipate enough to produce a partly sunny sky. For tonight forecast concerns are on extent of low clouds and possibility of fog/freezing fog.
Surface warm front has pushed through most of the forecast area as of 3 AM Sunday morning. Next cold front is located across central Kansas and northern Missouri, extending from Kansas City to Salina to Dodge City. At the same time, areas south of the boundary will likely heat up into the low to mid 80s.
1159 PM CDT Sat Nov 4 2017 Some fog may persist for a few more hours at KBVO before a warm front passes allowing south winds to increase. A cold front will move through the area Sunday and Sunday evening shifting the winds to the north. /Issued 935 PM CDT Sat Nov 4 2017/ Warm front continues to lift slowly north across northeast Oklahoma this evening.
1223 AM CDT Sun Nov 5 2017 Plenty of mid level cloud cover continues to stream across the region this afternoon as most of the low level stratus from this morning has eroded. along with allowing temperatures to climb into the lower 50s the past hour or so. have a difficult time seeing a rapid fall off in temperatures overnight ahead of an approaching cold front. Despite this low potential. with a rapid erosion of any fog that does develop as the aforementioned cold front tracks south across the local area. so also added this low end probability to the forecast.
High pressure remains locked over the western United States, keeping a combination of stagnant air, low stratus, and/or valley fog in most valleys across the region. One thing to note: should freezing fog become dense and last through much of the day, it could have a negative impact on air travel, as it so often does in these kinds of prolonged fog patterns.
Clearing skies combined with a reinforcing shot of cold air from this last cold front that moved through earlier today will leave low temperatures tonight in the mid 20s. For tomorrow, quiet weather with mostly clear skies are expected with high temperatures rebounding into the low to mid 50s.
213 PM CST Thu Dec 7 2017 Area remains under a deep/cold mid-level trough extending from Hudson Bay Canada through WI into the central/southern Plains.