Aikyam-Lab/Synoptic-Bench huggingface dataset:
Drier and cooler conditions are forecast through Friday with chilly overnight temperatures. Latest observations show temperatures ranging from the mid 30s to the mid 40s, generally 2 to 6 degrees cooler than at yesterday at this time. Dew point temperatures are in the 30s, also cooler. Clear skies, light winds, and drier air will result in cooler morning lows this morning and Saturday morning. Dry and cool conditions are expected to persist today into Saturday before a couple of low pressure systems bring rain chances back to the district.
Winds and cloud cover will increase by the afternoon ahead of a cold front, with gusts up to 20 kts or so possible. After sunset, a cold front will move in late tonight and early Saturday morning, bringing with it a line of -TSRA. Chattanooga Airport, TN 78 50 55 30 / 10 70 20 0 Knoxville McGhee Tyson Airport, TN 78 51 54 29 / 10 80 40 10 Oak Ridge, TN 77 49 53 27 / 10 80 30 10 Tri Cities Airport, TN 76 51 54 26 / 10 80 60 20 TN.
409 AM MST Fri Feb 24 2017 Upper level analysis has large trof over the western CONUS with weak closed low over the Northern Plains. At the surface, high pressure resides across North Dakota with north to northeast boundary layer flow present across the forecast area. A quick moving upper trof will cross the area.
Gusty west to northwest winds will continue through the afternoon behind the overnight cold front. /Issued 353 AM CST Fri Feb 24 2017/ Cold front currently from far NW AR into far SE OK continues steadily eastward and will clear the remainder of NW AR around sunrise.
An embedded mesoscale trough/ridge/trough setup is also in place respectively over these same locations. the two trough pieces converge over an arctic airmass centered over northern Saskatchewan. Farther upstream a second larger ridge is nosing in from the Gulf of Alaska over northern British Columbia and the Yukon Territory followed by and Alaskan Trough. Today through Saturday: Meso-ridge will exit and PACNW meso trough will move through the region during these periods. Saturday night: Meso ridge from Yukon will move through leaving partial clearing and dry conditions for roughly 12 hours.
351 AM PST Fri Feb 24 2017 Continued dry with slightly warmer days through Saturday with gusty west winds in the mountains and deserts Saturday.
Moderate to strong southerly winds across the offshore waters are at advisory levels this morning, however winds should decrease through late morning as a dryline/trough of low pressure moves across S TX. Cooler temps are expected behind the front tonight and Sat.
511 AM CST Fri Feb 24 2017 An upper trough will intensify as it moves from the Central plains to the Mid-Upper Mississippi Valley Today into Tonight.
Light winds tonight then a cold front expected toward the end of this TAF period. /issued 407 AM CST Fri Feb 24 2017/ Upper low over the Central Plains this morning with a broad trough extending to Mexico will move east today.
612 AM EST Fri Feb 24 2017 High pressure ridge will be over the area today with a cold front approaching from the northwest tonight.
Still seeing shallow upslope up to around 9000kt and still some wrap around moisture from slow moving upper low over Nebraska. However there is some lift wrapping back around the upper low that is causing some increase in the snow again over the southern Nebraska panhandle, and there are hints that this will continue to push into northeastern Colorado this morning. Meanwhile cooler air aloft will spread into the central mountains from the west. Temperatures will drop, though they will be limited by developing south winds on the plains and decent northwest winds over the mountain ridges and foothills. Models have flat, weak upper ridging over the CWA on Saturday.
A slow moving low pressure system will continue to wrap moisture into southwest Montana and Lemhi County today. Snow intensity will generally decrease through the morning as the low pressure system continues to meander eastward.
527 AM CST Fri Feb 24 2017 A cold front was sweeping across southern Missouri early this morning, bringing a much cooler airmass to the region. Highs today will range from the upper 40s in southeast Kansas to the lower 60s in south central Missouri. For tonight, temperatures will plummet into the low 20s.
High pressure north of the area will slowly move east providing for northeast and then easterly flow.
Low pressure well east of Florida will continue to shift farther away from the region as it lifts slowly toward the north to northeast.
Area soundings this morning showing an impressive capping inversion around 850 mb which should make it quite difficult for any warm advection convection this afternoon ahead of approaching cold front. This will help push a cold front through the the ArkLaMiss.
338 AM PST Fri Feb 24 2017 Freezing temperatures expected across much of the San Joaquin Valley this morning. While temperatures are currently near freezing, will expect overnight lows to bottom out at or below the freezing mark this morning.
The colder air will arrive tonight with high pressure settling across the region. Moderate to strong southerly winds across the offshore waters are at advisory levels this morning, however winds should decrease through late morning as a dryline/trough of low pressure moves across S TX. Cooler temps are expected behind the front tonight and Sat.
Saturday brings an increase in clouds and a chance of snow to areas along the NV border and central Idaho mountains as an upper trough drops through the Pac NW.
A cold front will begin to approach the area from the west around 00Z. This will help push a cold front through the the ArkLaMiss.
407 AM CST Fri Feb 24 2017 Upper low over the Central Plains this morning with a broad trough extending to Mexico will move east today.
558 AM CST Fri Feb 24 2017 08z/2am surface analysis shows 995mb low over northeast Missouri, with warm front extending from near Quincy to just south of Kankakee. Locations from Peoria northward are north of the warm front and are therefore still hovering in the lower to middle 40s. The low is projected to track slowly N/NE today. The timing of the low and its associated trailing cold front is right on target from previous forecasts, so the main short-term challenge remains timing of convective initialization along/ahead of the boundary. but it appears the higher probabilities for tornadoes will be focused further east across Indiana. As high pressure builds into the region, clearing skies and diminishing winds will lead to cold lows in the lower to middle 20s Saturday night.
540 AM CST Fri Feb 24 2017 For the 24/12z TAFs, MVFR ceilings will continue to develop and spread across the area as low level moisture pools ahead of a cold front. High temperatures to range from around 70 across se OK and sw AR to the lower 80s across deep east Texas. Fairly benign forecast through the weekend with high pressure prevailing areawide. Coldest night will be Saturday night with lows forecast to fall to near freezing across I-30 with mid 30s elsewhere.
This will help push a cold front through the the ArkLaMiss.
Amplified ridging over both oceans is leaving a positively tilted long wave trough axis from the arctic to the Desert SW. There are numerous shorter wave troughs embedded in the westerlies from the Central Plains westward across the intermountain west to off the left coast of Oregon. Another vigorous upper level trough will move down the West Coast late Friday into Saturday.
However there is some lift wrapping back around the upper low that is causing some increase in the snow again over the southern Nebraska panhandle, and there are hints that this will continue to push into northeastern Colorado this morning. Meanwhile cooler air aloft will spread into the central mountains from the west. Temperatures will drop, though they will be limited by developing south winds on the plains and decent northwest winds over the mountain ridges and foothills. Models have flat, weak upper ridging over the CWA on Saturday.
Issued by National Weather Service Memphis TN 533 AM CST Fri Feb 24 2017 Cold front is currently moving into northwest Arkansas and should be through HRO in the next hour or two. Winds will diminish after sunset, as the gradient relaxes and high pressure follows the front.
In addition, a dryline and Pacific cold front will move through today, bringing gusty northwest winds to all TAF sites by early afternoon. A weak cold front is also forecast to push across the area later today and brings a second surge of dry and cooler airmass over the region. In the wake of the cold front, a cooler airmass will spread across the region with overnight lows dropping to the upper 30s across the Hill Country and 40s elsewhere and daytime highs only in the 60s much areas on Saturday.
The airmass will actually stabilize a bit today and Saturday as a s/wv ridge moves through the area, bringing mostly clear skies.
Cold front slowly approaching the North Bay counties with warm frontal light rain already occurring. Much cooler Sunday with post frontal showers and isolated thunderstorms as snow levels lower from 3000 to 2000 feet.
A ridge of high pressure across the southern Appalachians overnight producing mostly clear sky and calm winds. Chattanooga Airport, TN 34 65 47 66 / 0 10 10 20 Knoxville McGhee Tyson Airport, TN 32 65 45 65 / 0 0 10 20 Oak Ridge, TN 32 66 44 63 / 0 0 10 20 Tri Cities Airport, TN 27 63 37 62 / 0 0 10 10.
High clouds will continue moving into the area tonight and this could keep our temperatures just a touch warmer than last night's low temperatures, as well as an increase in surface moisture. High pressure over the Carolinas will keep onshore flow strong this evening.
613 PM EST Sat Mar 4 2017 Dry conditions and mostly clear to partly cloudy skies are expected into tonight and Sunday as an upper level ridge builds in.
/00Z Update/ Upper level trof and associated precipitation continues to move east across the area. As a result, have stepped down the PoP chances overnight out west and focused the higher PoPs to the east.
735 PM EST Sat Mar 4 2017 Canadian high pressure will extend southward into the region tonight and Sunday.
This moist low level flow will continue overnight as the south Texas system continues to depart and a more impactful long wave trough digs into the western U.
Templer Previous discussion - Synoptic Setup: short term begins with a ridge running from New Mexico through the Central US Plains and western Ontario. This ridge fill out into a warm airmass over the western two-thirds of the CONUS. A trough extends from here into the Gulf of Alaska and is dropping south to off the coast of the Pacific Northwest. This afternoon through tonight: Northeast Montana begins under the warmer side of southwestern flow aloft.
253 PM PST Sat Mar 4 2017 Precipitation, increased winds and cooler temperatures will return tonight and continue through Sunday night.
An upper level trough currently over west Texas is forecast to push across the area late this evening into Sunday morning and interact with plenty moisture pushing to the north out of the Gulf. Drying conditions are expected from west to east as the upper level trough moves east of the area Sunday. /00Z Update/ Upper level trof and associated precipitation continues to move east across the area. As a result, have stepped down the PoP chances overnight out west and focused the higher PoPs to the east.
Will adjust temps a bit warmer tonight along the foothills and Palmer Divide tonight with downslope component, otherwise weak inversions will develop overnight.
817 PM EST Sat Mar 4 2017 High pressure remains in control of the weather through the weekend.
Winds will diminish by Sunday as high pressure builds in from the west.
406 PM CST Sat Mar 4 2017 This active weather is expected to continue tonight and into to- morrow as a series of upper level disturbances move across from the SW (ahead of the main upper trof out west). As this main sy- stem moves into SE TX tomorrow, we should see increased POPS in and around a developing surface trof/low. The upper trof is expected to move east out of the area by late tomorrow afternoon/evening, but we could see some low POPS ling- er as the overall SW flow aloft remains in place.
740 PM EST Sat Mar 4 2017 High pressure will build across eastern Canada and the northeastern states tonight and Sunday.
/ISSUED 406 PM CST Sat Mar 4 2017/ This active weather is expected to continue tonight and into to- morrow as a series of upper level disturbances move across from the SW (ahead of the main upper trof out west). As this main system moves into SE TX tomorrow, we should see increased POPS in and around a developing surface trof/low. The upper trof is expected to move east out of the area by late tomorrow afternoon/evening, but we could see some low POPS linger as the overall SW flow aloft remains in place.
1052 PM EST Sat Mar 4 2017 Canadian high pressure will ridge into the forecast area from the north through tonight. Tonight will be cold again and much of the area will have freezing temperatures. It will not be as cold Sunday night because of air mass modification and developing onshore flow as the ridge shifts eastward.
Moisture will continue to surge north tonight, while upper level low moves across northern Mexico.
/issued 225 PM CST Sat Mar 4 2017/ Upper level trough to our west quickly filling but lift out ahead of the trough is resulting in scattered to numerous areas of showers, especially across the Lower Toledo Bend and Sam Rayburn County of Deep East Texas into West Central Louisiana. Introduced isolated thunderstorms in the grids across our southwest half even through we have yet to see any lightning strikes today but this will be possible as the filling trough approaches from the west tonight. Upper trough axis should be in the vicinity of East Texas by 12z Sun and nearing the Lower Miss Valley by 00z Mon.
937 PM EST Sat Mar 4 2017 Canadian high pressure will extend southward into the region tonight and Sunday.
513 PM CST Sat Mar 4 2017 Strong 1044 mb high pressure over western Quebec and ridging southward into the eastern Ohio river valley that brought sunny skies to central IL today, will drift eastward across the Atlantic States on Sunday. An upper level ridge will continue to build into IL tonight and expand over the central Great Lakes, Ohio and TN river valleys on Sunday. Mild springlike highs in the lower 60s are expected over most of CWA with a few upper 50s from Bloomington and Champaign ne, with mid 60s over west central IL from Jacksonville west.
Temperatures have warmed well into the 60s but the airmass is still quite dry with dewpoints generally in the lower 20s.
505 PM EST Sat Mar 4 2017 Dry weather expected through the weekend as high pressure builds back in over the region. Increased sunshine, moderating temperatures and dry conditions expected Sunday as a rather strong upper level ridge moves through the Upper Midwest, pulling warmer air northward ahead of it.
With the sunny skies, daily high temperatures so far have warmed into the low/mid 60s with light southerly winds. A cold upper level low now moving towards the Pacific NW coast and the more southern system will continue moving eastward; though not as phased this go around. Unlike a chilly last night, low temperatures tonight should be somewhat warmer, into the mid 30s east to lower 40s west. Dry and slightly warmer conditions are forecast to start a new week.
656 PM EST Sat Mar 4 2017 Weak upper ridge to round out weekend.
357 PM MST Sat Mar 4 2017 The ridge of high pressure responsible for the nice weather over the past few days has continued to slowly shift eastward this afternoon. Aloft, a 110kt jet streak at 300mb will pivot around the base of a trough and over the Utah/Colorado area early in the evening.
924 PM EST Sat Mar 4 2017 Dry weather expected through the weekend as high pressure builds back in over the region. Increased sunshine, moderating temperatures and dry conditions expected Sunday as a rather strong upper level ridge moves through the Upper Midwest, pulling warmer air northward ahead of it.
855 PM CST Sat Mar 4 2017 Water vapor imagery is showing trough axis approaching the Rio Grande, which means most of the DCVA will be over the northeastern areas this evening and after midnight, generally pushing northeast with the eastward progression of the trough axis.
652 PM EST Sat Mar 4 2017 Dry weather expected through the weekend as high pressure builds back in over the region. Increased sunshine, moderating temperatures and dry conditions expected Sunday as a rather strong upper level ridge moves through the Upper Midwest, pulling warmer air northward ahead of it.
Ridge of high pressure across the southern Appalachians will keep winds generally light, except during the afternoon when southwest winds of 10kts or less are expected.
A strong low pressure system moving into the Pacific Northwest will result in breezy to locally windy conditions to some areas through tonight with very strong winds developing Sunday in most areas.
531 PM CST Sat Mar 4 2017 As a long wave trough enters the U. The challenge for tomorrow is forecasting the dissipation of the stratus deck as the clouds will make or break the high temperature forecast. With the higher March sun angle and resulting mixing, expect the inversion to relax and give us some sunshine.
1047 PM EST Sat Mar 4 2017 High pressure will build across eastern Canada and the northeastern states tonight and Sunday.
345 PM MST Sat Mar 4 2017 The ridge of high pressure responsible for the nice weather over the past few days has continued to slowly shift eastward this afternoon. Aloft, a 110kt jet streak at 300mb will pivot around the base of a trough and over the Utah/Colorado area early in the evening.
As the trough departs, the area is going to be left in a very moist environment Sunday evening and night, but with no real lift to be found, only a few isolated showers are expected.
Will go ahead and include the lower ceilings at all area terminals, in addition to MVFR visibility in fog at KHOB. Upper level lift and an increase in moisture will result in rain chances for southeastern parts of the CWA in the Lower Trans Pecos and far southern Permian Basin. Low clouds will keep overnight temperatures in the low 50s/upper 40s which is well above normal across the Permian Basin and Lower Trans Pecos. Rain and thunderstorm chances will diminish through the weekend as trough moves east and weakens.
642 PM EST Sat Mar 4 2017 High pressure is firmly anchored over the region and will remain in control for the remainder of the weekend promoting fair/dry weather.
High pressure moving off to toward the East Coast will continue to allow unseasonably mild conditions to overtake the region this weekend.
1100 PM EST Sat Mar 4 2017 High pressure will build across eastern Canada and the northeastern states tonight and Sunday.
Models remain in overall agreement in an upper low and trough moving into the Pac NW and moving through the central and northern Rockies Sunday into Sunday night.
646 PM EST Sat Mar 4 2017 Canadian high pressure will ridge into the forecast area from the north through tonight. Tonight will be cold again and much of the area will have freezing temperatures. It will not be as cold Sunday night because of air mass modification and developing onshore flow as the ridge shifts eastward.
739 PM CST Sat Mar 4 2017 Tennessee Valley region remains on the backside of a broad ridge of high pressure this evening. As such, temperatures will remain a fair amount above last night's readings and should bottom out somewhere around 40 degrees in most areas (perhaps slightly cooler in the northeast). Dry and slightly warmer conditions are forecast to start a new week.
Temperatures are in the lower 70s. In the low levels of the atmosphere, a large area of high pressure near the Mid-Atlantic United States will build southward down the Florida Peninsula overnight. In the mid levels of the atmosphere, an anticyclone will be centered over the central Gulf of Mexico tonight.
924 PM EST Sat Mar 4 2017 High pressure is firmly anchored over the region and will remain in control for the remainder of the weekend promoting fair/dry weather.
Broad, weak low pressure was located over the western Dakotas this afternoon. A warm front extends from the low through the Mid-Mississippi Valley, and lies roughly near a Des Moines to Keokuk, IA axis at 3 pm. The warm front was the dividing line between temps in the 60s south, to the lower 40s further to the north along the Hwy 20 corridor. Otherwise, with moisture quite limited not seeing any clouds with the warm front, with mainly some cirrus increasing well ahead of a couple upper air disturbances lifting from the northern Rockies through the northern Plains. Warm front is expected to gradually lift northward tonight into early Sunday.
639 PM EST Sat Mar 4 2017 High pressure will build across eastern Canada and the northeastern states tonight and Sunday.
553 PM EST Sat Mar 4 2017 Lingering influence of high pressure centered to the northeast will maintain a dry and stable low level environment tonight. There may be some increase in mid cloud Sunday morning as warmer mid level air arrives, but model guidance continues to indicate cigs will hold above 5k ft given the existing dry/light southeast flow. Large high pressure (1042-1044 MB) along the southern Ontario/Quebec border.
This activity will continue to stream north and east throughout the morning, growing a bit more intense during the afternoon as the parent upper level trough (digging into California/Nevada/Arizona) sends an upper level jet streak and various mid level instability features overhead.
457 AM MST Sat Dec 24 2016 Current surface analysis shows Canadian cold front sliding slowly south across far northeast WY and SD. Upper level analysis shows weak ridge to the east of the area, with storm system to affect us Christmas Day now along the Pacific coast.
638 AM CST Sat Dec 24 2016 Temperatures have cooled into the single digits across the north into the central valley under wedge of high pressure. Colder air will continue to sag southward mainly across the north with temperatures over the remainder of the fa in the low to mid 20s. If guidance continues to maintain warmer column and a westward shift of low track, rain/freezing rain not snow accumulations will be the main impact. Later Sunday night as the low lifts through the forecast area winds could diminish then pick up again late as the low departs.
844 AM EST Sat Dec 24 2016 The Wind Advisory will be canceled early as most obs across the higher terrain are well below criteria now. The rest of the forecast looks on track, as the axis of rain will shift from the northern half to the southern half through the day, with rain intensity gradually decreasing as we lose forcing from the upper level jet and the passage of the 850-700 mb trough to our east.
457 AM CST Sat Dec 24 2016 (Today and Tonight) A potent upper level trough, currently coming onshore along the West Coast, will become negatively tilted as it lifts northeast across the Southern Rockies tonight into early Christmas Day. Temperatures today will be around 10 degrees warmer than normal, with afternoon highs in the upper 60s to around 70 degrees. Temperatures are not expected to drop much overnight, with lows mainly in the lower 60s.
Subsidence will be decreasing in the wake of the upper trough through the morning with no sign of stratus dissipation. A weak high pressure area will prevail late this morning into this evening. Will hang onto stratus today and tonight with high temps several degrees warmer than the lows later this morning. Ely winds will develop late tonight as strong cyclogenesis will be underway over the high plains of CO. Kept slight chances of freezing drizzle or drizzle only toward central WI where a confluent and convergent low level flow is depicted on the models late tonight. The ely flow will warm temps above freezing over ern Sheboygan County so pcpn type would be drizzle. Overall any freezing drizzle or drizzle would be patchy.