Aikyam-Lab/Synoptic-Bench huggingface dataset:
Clear and cool conditions prevailed early this morning across the lower Ohio Valley. A surface analysis revealed high pressure sprawled across the central US, while aloft, deep upper troughing encompassed much of the Great Lakes region. For today, plan on another seasonably cool day with mostly sunny skies and light winds as high pressure settles over the TN Valley.
A large ridge resides will remain over the western half of the CONUS and Canada the next few days with a large trough over the eastern halves. The ridge will continue to build into Montana today and Friday which will bring warmer and drier air into the region.
356 AM CDT Thu Sep 7 2017 Water vapor imagery shows a long wave trough over the eastern half of the United States this morning, with the ArkLaTex under the influences of northwesterly flow aloft on the back side of this trough. The trough over the eastern half of the US will gradually lift to the northeast Friday and into the weekend. As a result, high pressure will begin to expand back into the region, but not really take hold until the middle of the work week. It should be noted that the ridge should keep Hurricane Katia well to our south, moving her into Mexico. /Prev discussion issued at 1156 PM CDT Wed Sept 6/ For the ArkLaTex, SKC and a beautiful fall like night with winds decoupled under the influence of cool high pressure in a sea of tropical cyclones.
A cool front shifted through the region overnight and this morning with its current position now in deep south Texas while a deeper longwave trough shifts across the MS Valley. This front has ushered in dewpoints in the low 40s this afternoon. Some locations could over-achieve on their lows in drainage locations into the low 50s early tomorrow morning.
340 AM EDT Thu Sep 7 2017 A cold front pushes off the coast early this morning.
High pressure will hold on for one more day and then exit to the east tomorrow, making way for southerly flow and the return of some moisture into our region.
635 AM EDT Thu Sep 7 2017 High pressure will build into the region from the west and northwest tonight through the upcoming weekend.
316 AM EDT Thu Sep 7 2017 Cool weather and shower chances can be expected until high pressure builds this weekend. Little overall change was needed for todays forecast as cold temperature and more convection chances will plague the region as the longwave trough axis slides eastward. Otherwise, VFR is expected through the TAF period with altocu and stratocu under upper troughing. Brief restrictions are possible through Fri under an upper trough.
ENE to E winds around 8-10 kts across the I-10 corridor terminals today with high pressure ridging southward. Light and variable winds expected at AEX as the center of the ridge move over C LA this afternoon, and light and variable to calm areawide after sunset. The high will slide east today, with winds bcmg light and vrb or southeast by late aftn. /issued 305 AM CST Thu Mar 8 2018/ High pressure continues to settle into the region with cool temperatures across the area this morning. The high pressure center will shift to the east of the area on Friday and return to southerly flow will increase through the day.
Winds will briefly pick up Friday afternoon with the highest winds roughly north of a line from Dodge City to Hays and this will lead to an enhanced fire danger in those regions.
A series of short wave low pressure troughs in west to southwest flow aloft will bring Pacific moisture and lift into the western mountains of Wyoming tonight through Friday night with accumulations of 4 to 7 inches above 8500 feet, and 2 to 4 inches below 8500 feet, tonight and again on Friday. Winds will increase across the higher ridges later tonight and through Friday.
212 PM MST Thu Mar 8 2018 Weak energy out in front of the next trough, along with a warm front will generate light snow and possibly freezing rain late this afternoon and tonight.
953 AM MST Thu Mar 8 2018 High pressure will continue to build in today and allow winds to become a bit more west to southwesterly. This flow will usher in warmer air allowing temperatures to reach more normal values for this time of year.
212 PM CST Thu Mar 8 2018 A spring-like pattern will keep the weather on its feet over the next few days with fire weather and a strong cold front in the offing. Broad upper ridging to our west will break down over the next few days as a series of troughs move across the West and Plains. Winds will also increase across the higher terrain and adjacent plains creating fire weather concerns. Temperatures will warm well above normal Friday as a pronounced low level thermal ridge develops across W TX and S NM.
Light, accumulating snow is best from the Mobridge area, to Miller and Huron where a half inch of snow is possible. Kept temperatures on the cooler side of guidance on Friday, even with the weak WAA.
Water vapor satellite imagery loop shows a mid/upper level low pressure system slightly east of due north and will move across the Olympic Peninsula this morning. Thus most of the dynamic lift associated with the low will impact NW Washington and miss the forecast. Strong onshore flow along the coast in the wake of the low will produce southwest flow aloft east of the Cascades today thus yielding a significant westerly component to winds aloft east of the Cascades.
343 PM CST Thu Mar 8 2018 High pressure will continue move east while low pressure develops across the high plains overnight. However winds will shift during the day depending on where you are at from ESE to a more NE direction by later in the day as the low moves east of the area.
234 PM CST Thu Mar 8 2018 Cyclonic flow around upper level trough to our northeast continues to generate clouds and scattered flurries early this afternoon, mainly across the eastern half of the region. As high pressure nudges into the region, clouds will depart eastward leaving behind mainly clear skies this evening/overnight. High pressure doesn't stick around long though, as warm front begins to develop across the region tomorrow as weak surface pressure develops to our west in Kansas.
Made some minor adjustments to winds, mainly a bit more in the higher mountains. The increased WNW flow in the upper levels and stability will also increase winds over the higher terrain with gusts to 45 mph possible through the afternoon.
Focus for greater coverage of snow showers has shifted focus from NW Lower Michigan to NW Lower Michigan with loss of synoptic support from the low. Low temps tonight will cool into the low to mid 20s. High temps Friday afternoon will only warm into the low to mid 30s. However, surface ridging and a light wind flow will be inhibitors.
High pressure will remain in place across the Southwest today.
Aloft - A short wave trough over British Columbia coastal waters pushes onshore. This shifts a ridge over the U. Surface - High pressure along the Mississippi Valley. This high re- centers into the eastern Gulf by Fri afternoon. The approaching high pressure maintains a dry and cool air mass as the low level flow becomes northerly tonight and northeasterly Fri. It will be another cool to cold night with a few Nature Coast locations coming close to freezing but only briefly. With high pressure overhead Friday night, temperatures will fall quickly into the 40s away from the coast under mostly clear skies.
A large closed upper low was centered over the western Great Lakes region with a ridge over the Rockies. The upper low over the western Great Lakes will drop southeast today. Rising heights aloft are expected over the area, however the ridge out west as the next storm system slams into the western U. At the surface, the ridge currently over the plains will shift over the area today and to the southeast of the area tonight.
1211 PM MST Thu Mar 8 2018 Upper ridging over the western CONUS will provide quite mild and dry weather to the CWA today through Friday.
300 PM MST Thu Mar 8 2018 21Z upper level analysis has large trof across the Great Lakes and New England area, with ridging across the west. Across the Northern Plains, skies are mostly cloudy with just some mid to high level cirrus topping the ridge. At the surface, cold high pressure resides across Minnesota, with warm frontal boundary in the lee of the Rockies. Western upper ridge will slowly shift east tonight and Friday as weak warm frontal boundary lifts northeast across the area.
Upper air analysis last evening showed a ridge over the western half of the country with northwesterly flow across Texas. High pressure at the surface was centered over East Texas with a loose pressure gradient across our CWA.
Lows tonight are expected in the 20s with a slightly warmer day on Friday with the westerly/northwesterly downslope flow.
148 PM MST Thu Mar 8 2018 For the rest of today, daily max temperatures will climb in the low to mid 60s as an area of broad high pressure dominates the area. Lows will be in the lower 30s.
A few inches of accumulation will be possible, especially in the higher terrain surrounding the Cortland, Syracuse and Norwich area.
Weak northwest flow regime continues across the fcst area this morning yielding persistent low clouds and light snow showers across portions of the high terrain. Chattanooga Airport, TN 44 28 55 42 / 10 10 0 20 Knoxville McGhee Tyson Airport, TN 42 26 50 38 / 20 10 10 30 Oak Ridge, TN 43 26 51 38 / 20 10 20 40 Tri Cities Airport, TN 38 22 46 34 / 30 10 10 50.
Northwest winds continue to pull in cooler air and temperatures will struggle to climb.
Ridge axis extending from the central plains of Iowa to the NW through the forecast area into the Canadian prairies.
Scattered showers today will become more widespread through this evening and overnight as a cold front approaches from the north and west. For the remainder of the region, snow will continue in the high terrain above 4500 feet, with rain likely in valleys across north central Idaho and western Montana. Conditions will clear throughout the evening with high pressure building Friday night.
307 PM CST Thu Mar 8 2018 Fairly weak northwesterly flow aloft continues over the Panhandles this afternoon north of a ridge south of Baja. Broad cyclonic flow continues as a large upper low shifts into the northeastern CONUS. Near the surface, a lee trough is slowly shifting east out of the Raton Mesa area, keeping winds in the northwestern zones light while winds are breezy to windy further east and south. Even warmer temperatures are expected Friday with mid to upper 70s area wide, while the lee trough axis centers over the Panhandles keeping winds light and variable.
Breezy conditions will aid in diurnal mixing, though a stronger cold pool aloft than yesterday will result in slightly cooler afternoon highs. 84 to low 60s south of the highway.
As the upper trof axis shifts east of the area this evening and solar insolation ceases, Snow squalls will give way to primarily upslope snows that will carry thru the overnight hours. Temps were worked to keep lows a bit warmer than guidance across the north where clouds linger, while going close to guidance elsewhere. Any upslope snow showers wane Friday morning as the low level flow turns more south-southwest ahead of the next system.
Canadian high pressure building into the western Gulf coast and low pressure tracking along the New England coast toward the Canadian Maritimes will result in a slightly tightening pressure gradient. High pressure to the west and low pressure off New England will tighten the gradient slightly today.
A warm front will lift north across the region on Friday, providing a solid warmup during the afternoon. Highs will reach the 50s to lower 60s in many areas, with far northeast Missouri holding in the middle 40s where the warm front fails to reach.
As this high pressure system continues to slide southeast and into the Missouri river valley later today. With 850 MB temperatures about 3-5C warmer than yesterday afternoon. These warmer temperatures combined with generally light winds of 10 MPH or less. Most of the models have the low near the panhandle of Texas, but there is a boundary across Kansas. There will be warmer temperatures across the area on Friday with mainly light winds. The warmer temperatures will continue into Friday night.
The showers will continue through the afternoon, mainly over the higher terrain of southwest Idaho. Upper level trough will bring showers today through Friday along with breezy southwesterly winds. Satellite showing the upper level low moving toward the coast of Washington state this morning with showers spreading across Eastern Oregon. Friday morning has a better chance for rain in the lower valleys with passage of the upper level trough and cold front.
An upper level ridge was centered to the west of the area. Not much change is expected through the next 12 to 24 hours as the ridge hangs out to the west.
For tonight, no major headlines other than temps falling below freezing. Expecting temps to fall into the mid/upper 20s to around 30 tonight, but will recover above freezing quickly after sunrise. Warm and moist flow the the S and SW will developed across the SE US as the low level ridge drifts toward the Atlantic coast.
Otherwise, the main sensible weather highlights include highs about 10-15 degrees warmer than yesterday and partly to mostly sunny skies. Large scale pattern will feature a broad ridge across the western and central CONUS and a trough over the eastern CONUS with NEB under northwest flow. High pressure will shift east today as a lee-side trough sharpens and evolve near the Front Range to Laramie mountains. Highs are forecast in the upper 50s to lower 60s today given the combination of sufficient insolation, mixing, and warmer temperatures aloft moving in. Further, a modest downsloping wind should help promote drier afternoon humidity and warmer temperatures, especially across the eastern Panhandle to southwest NEB. Southerly low level flow beneath upper level ridging will draw warmer air north into the area Friday, with highs in the lower to mid 60s across southwest Nebraska.
Continued relatively mild in advance of the cold front.
1101 AM CST Thu Mar 8 2018 135 AM CST Another day of seasonally cold weather will be on tap today, courtesy of deep low pressure across the eastern Great Lakes region. Energy will continue to rotate southwestward across the area as the low slowly pulls off to the east. Flurries are a possibility too, though later today we lose some of the ice production in the clouds as the lower level column warms slightly so we don't anticipate much.
141 PM CST Thu Mar 8 2018 High pressure over the region today will slowly shift east through tonight.
However, satellite and radar imagery show the cloud band crossing the Divide this morning, moving out over the high plains west of here. Templer Previous update: 640 AM Update: Sent an update early this morning to bring in the latest observed low temperatures - several of which showed colder readings than expected - and to include a few areas of patchy freezing fog possible near Wolf Point, Poplar, and Plentywood, based on observations and reports. BMickelson Previous discussion: On an otherwise benign, yet cold, morning across the region a few isolated spots of haze or mist or patchy freezing fog seem possible along the lower Milk River and Missouri River valley through NE Montana. SREF model data also indicate the chance for some freezing rain on the backside of this snow.
A warm front will work around the back side of this eastward shifting High by afternoon, and by Friday evening/overnight, its warm/moist advection will lead to increasing clouds/chance of rain.
238 PM MST Thu Mar 8 2018 For the rest of today, daily max temperatures will climb in the low to mid 60s as an area of broad high pressure dominates the area. Lows will be in the lower 30s.
235 PM CST Thu Mar 8 2018 A deep upper low just east of the Great Lakes will lift into the northeastern CONUS, while a ridging pattern across the Central and Northern Plains will begin to flatten heading into Friday morning. Low-level moisture will then arrive Friday afternoon as a warm front lifts into the area.
/issued 325 AM CST Thu Mar 8 2018/ Surface analysis this morning places a 1026 mb ridge of high pressure over the Southern Plains. This is resulting in clear skies across the Mid South with temperatures as of 3 AM CST in the lower to middle 30s at most locations. Northwest flow aloft will persist across the Lower Mississippi Valley into tonight while a ridge of high pressure will remain in place across the region into Friday. This will result in continued below normal temperatures but slightly warmer than yesterday. Southerly winds on the backside of high pressure will result in temperatures moderating back into the upper 50s to middle 60s on Friday.
Issued by National Weather Service MEMPHIS TN 1206 PM CST Thu Mar 8 2018 High pressure is slowly moving across the state and will dominate the weather for the next 24 hours.
High pressure is centered over the East Texas Lakes this afternoon while an upper trough is over the east half of the lower 48. A west to northwest flow is over the region on the backside of the upper trough which is streaming cirrus in from the Pacific Ocean ahead of a disturbance over the northwest states.
Temperatures will be slightly below to near normal today with highs in the low to mid 70s. The southeast winds will bring a few showers north along the west Gulf coast tonight, and some could drift over the coastal counties or into portions of the lower valley by Friday morning. Low temperatures tonight will be mild with temperatures falling into the low to mid 60s, which is at or slightly above normal.
An area of mostly cloudy conditions/mid level clouds associated with a shortage trough in south central Saskatchewan were noted over north central North Dakota, moving southeast with time. Aloft, broad ridging with an approaching warm front from eastern Montana will produce an increase in clouds west this afternoon, otherwise mostly sunny with highs in the 20s, to around 30 southwest. At the surface, expect a surface warm front spreading a chance of light snow across mainly northern and central North Dakota Friday.
Another area low pressure with a chance of snow and rain showers this weekend. As the upper trof axis shifts east of the area this evening and solar insolation ceases, Snow squalls will give way to primarily upslope snows that will carry thru the overnight hours. Temps were worked to keep lows a bit warmer than guidance across the north where clouds linger, while going close to guidance elsewhere. Any upslope snow showers wane Friday morning as the low level flow turns more south-southwest ahead of the next system. Upper low pulls off to the east on Friday and mountain snow showers come to an end Friday morning.
Last of the snow showers and flurries is exiting southeast Illinois early this morning, as a fast moving upper trough swings into the Ohio Valley. With time, the upper low over lower Michigan will make some eastward progress later today, starting a pattern shift over the central U. In the interim, rather cool air will remain in place courtesy of the low, with another day of highs in the mid to upper 30s on tap. Cloud trends will continue to decrease through this evening, as an axis of high pressure drifts into the region, although cirrus will begin moving in from the west late in the night.
Warmer Pacific storm brings some rain and higher elevation mountain snow over the weekend.
To our west, a lee trough is developing, and by Friday, we'll have stronger south winds and increasing moisture. For locations that receive full sun across northeast Oklahoma, highs in the low to mid 70s look good on Friday. By Friday night, a cold front will be located along the KS/OK border, leaving most of eastern Oklahoma and western Arkansas in the developing warm sector.
A surface trof moving southeast across the Panhandles will cause wind directions to veer from the the southwest to the northwest at all terminals. Diurnal winds will be gusty this afternoon, with speeds around 15 to 25 kts with higher gusts possible, until the surface trof reaches the terminal this afternoon. Winds are expected to drop to AOB 10 kts behind the surface trof, and remain at this speed through the Friday morning.
Water vapor satellite imagery loop shows a mid/upper level low pressure system just offshore of the WA coast, which is moving slightly east of due north and will move across the Olympic Peninsula this morning. Thus most of the dynamic lift associated with the low will impact NW Washington and miss the forecast area. Strong onshore flow along the coast in the wake of the low will produce southwest flow aloft east of the Cascades today thus yielding a significant westerly component to winds aloft east of the Cascades.
broad low amplitude ridge axis slowly spreads over the area with just some high clouds expected. 850mb temperatures warm another 12F to 15F across the area supporting highs generally in the low to mid 60s. Winds become light and variable during the night ahead of an approaching upper trough and associated cold front. Low temperatures in the low to mid 30s.
353 PM CST Thu Mar 8 2018 Cirrus continues to stream overhead with air temps in the low to mid 60s for most, but a couple of upper 60s far West. Winds have been light and variable as high pressure is slowly working East. We can expect little if any frost in the morning with air temps running around 10 degrees warmer for all, but Monroe and 38 there.
1219 PM EST Thu Mar 8 2018 Low pressure over Lake Huron will remain nearly stationary today and will then move southeast and away from the area tonight. A trough will rotate southeast across the area today. A trough of low pressure will linger back west over the local area through Friday.
/issued 345 AM CST Thu Mar 8 2018/ WV imagery shows an upper-lvl ridge moving east into the wrn CONUS this morning, courtesy of a closed low nudging into the PacNW.
By Friday, high pressure will shift east and a warm front will lift into the area as northwest flow aloft relaxes. Highs across the southern CWA in the warm sector will rise into the low 60s whereas the northern CWA will remain in the mid to upper 40s.
High pressure stretching across eastern SD through eastern KS early this morning will continue to slowly exit to the southeast, with a ridge remaining over our far eastern counties through early afternoon. Light snow is expected to slide into our northwestern counties late this evening, and quickly expand toward southeastern SD by 09Z as the 500mb ridge to our west becomes surpressed and a an embedded trough swings across the Dakotas. For the daytime hours Friday we'll be stuck between the exiting ridge over eastern MN and WI and an elongated area of low pressure organizing from southern Alberta through MT and western NE.
1013 AM MST Thu Mar 8 2018 An upper low continues to spin over the Great Lakes, while another upper low pushes into the Pacific Northwest. In between, a ridge is spreading across the western and central states. At the surface, high pressure rests over central/eastern ND/SD/NE. Upper ridging will keep conditions mild and dry for the next couple of days.
Winds increase tonight through Friday morning with another round of showers likely to accompany a cold front passing through the region late Friday and Friday night. A lifting/weakening upper-level trough over the Pacific NW is helping to push upper ridging off to the northern Great Plains.
/Tonight through Friday/ Large area of high pressure dominating the region with mainly clear skies and cooler conditions remain with cooler air in place aloft. The area of high pressure to shift off to the south and east tonight with return flow setting up tonight aloft and WAA into the state for late tonight/Friday. Moisture also to return, with a decent mid level cloud deck expected to spread into the state late tonight into Friday with the push of warmer air and increasing moisture. A weak push of energy aloft to drop southeastward through the state late tonight into early Friday as the upper ridges builds eastward into the region.
Light winds today as high pressure ridge moves over the area, then winds turn southerly tonight.