Aikyam-Lab/Synoptic-Bench huggingface dataset:
On Friday, high pressure will begin departing to the east. (46) High pressure over Arkansas will slowly move east and be replaced by frontal syatem over the weekend. The upper level pattern has a trough moving into the area over the weekend.
918 PM CST Thu Mar 8 2018 High pressure prevails over the Mid-South with just a few high clouds passing through. Temps are cooling quickly this evening and will fall to the freezing mark or below across much of the Mid- South. These clouds have kept temperatures in the low 40s. with warmer readings found elsewhere across the Midsouth. Believe models just tend to struggle with both the intensity and timing of descending waves phasing with the main trough.
905 PM EST Thu Mar 8 2018 Upper level low pressure will continue to support periodic snow showers through Friday. Changes for the early eve update were primarily cosmetic as cold upper low pressure continues to dig over the Upper Ohio Region. Scattered to numerous snow showers will thus continue, and are likely to transition to bands tonight as cold flow aligns in the wake of the mid level trough axis. That pattern is progged to continue into Friday morning with additional accumulations in the favorable upslope regions along I 80 and the higher elevations. At least scattered snow showers will continue into Friday night in the favored lake/ridge areas, but coverage will decrease with departure of the wave and slackening lapse rates overnight.
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.
Issued by National Weather Service MEMPHIS TN 414 PM CST Thu Mar 8 2018 High pressure over Arkansas will slowly move east and be replaced by frontal syatem over the weekend. The upper level pattern has a trough moving into the area over the weekend.
1044 PM EST Thu Mar 8 2018 A pronounced upper level low centered over the eastern Great Lakes region will slowly migrate eastward away from the Ohio Valley tonight into the day on Friday.
433 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.
448 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.
There is a possibility for more low clouds to develop Friday morning, but they should dissipate for the afternoon as high pressure spreads into the region.
Otherwise, a clear sky reported over the remainder of the forecast area this evening as high pressure was centered over the state. The high should drift off to our east while a warm front develops to our south overnight and into the morning hours of Friday. As a ridge of high pressure gradually shifts east of the region, a warm frontal boundary will begin to take shape from Nebraska southeastward into the Ozarks late tonight into Friday. Elsewhere around the area, mostly cloudy conditions will be the rule with highs topping out in the lower to middle 40s. Will have to keep an eye on thermal profiles across the far SE CWA Friday night as low temperatures drop into the lower 30s. Soundings suggest any precip that may be falling could potentially change to a period of light freezing rain overnight.
/Issued 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.
806 PM CST Thu Mar 8 2018 Northwest flow aloft continues this evening on the backside of a departing upper trough, centered over the northeast states. Cold advection will slacken this evening as a mid level ridge builds eastward overnight, raising 850mb temps. Given we dropped into the mid 20s in a few spots last night with less than ideal conditions, would expect to see that in quite a few areas tonight with all areas getting below freezing. 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.
947 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 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.
Issued by National Weather Service KANSAS CITY/PLEASANT HILL MO 544 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.
530 PM EST Thu Mar 8 2018 Upper level low pressure will continue to support periodic snow showers through Friday. Changes for the early eve update were primarily cosmetic as cold upper low pressure continues to dig over the Upper Ohio Region. Scattered to numerous snow showers will thus continue, and are likely to transition to bands tonight as cold flow aligns in the wake of the mid level trough axis. That pattern is progged to continue into Friday morning with additional accumulations in the favorable upslope regions along I 80 and the higher elevations. At least scattered snow showers will continue into Friday night in the favored lake/ridge areas, but coverage will decrease with departure of the wave and slackening lapse rates overnight.
Relaxed high pressure easing eastward across the waters today will keep winds gentle and allow then to shift in an afternoon sea breeze.
1104 AM CDT Fri Sep 1 2017 Low pressure currently located over central Tennessee will move northeast the rest of the day. Ample insolation and the 850mb thermal ridge building into the area, expect temps to be more seasonable. Temps on Mon will actually be above seasonal average, expected to reach the low 90s in places just ahead of a cdfnt.
A weak trough is producing showers and storms over the coastal waters this morning, however this convection should decrease as the morning progresses.
High temps will be in the lower to mid 90s. Ridge axis shifts south of the area today with winds continuing out of the south to southwest.
A broad trough will remain in place across the Eastern US.
/issued 336 AM CDT Fri Sep 1 2017/ Mid-upper level trough currently extending from Northern Plains into Central Rockies will take on a more south and southeast trajectory as pacific ridge builds eastward. As thermal trough passes over the region tonight through the first half of Saturday, an area of mainly light rain is likely across northern into central Oklahoma. Little in the way of surface reflection of this passing trough, other than development of higher terrain/West Texas weak surface cyclone.
An upper level trough crossing the region today will bring showers to the area. With limited instability and mid level lapse rates, not expecting a great deal of thunder with the upper level trough. With cloudy skies in the eastern CWA around peak heating, highs will be on the cool side with readings in the lower 70s. Several CAMS are showing convection developing along the cold front late the afternoon in ND.
746 AM EDT Fri Sep 1 2017 High pressure will pass over the area today, then the remnants of what was once Hurricane Harvey will track slowly across the Ohio Valley and cross the region this weekend accompanied by an area of rain. A cool start to the day (and also the new month) will be followed by a cooler than average day with north/northeast flow behind a cold front. At the surface, high pressure will slide across the region, with a trough (ahead of the remnants of Harvey) beginning to work into the SW portion of CWA late in the day - which may bring a light shower or two to the Laurels before sunset.
The upper level trough will continue to drag across the southern half of the area, making slow progress to the east and south. WV satellite imagery shows frontolysis occurring at all levels so uplift from the trough is minimal. Further north and west cooler temperatures and more stable conditions will continue spreading over the area. After midnight tonight the trough should be south of the CO and UT borders and closed high pressure will once again take hold over the Great Basin. The strong ridge over the Great Basin will remain the dominant weather feature over the western U.
Skies will become cloudy Saturday as a surface and upper trough approach.
1246 PM EDT Fri Sep 1 2017 Cooler temperatures expected while the remnants of Harvey bring rain later today through much of the weekend.
Farther east, tropical depression Harvey was lifting into western Tennessee, while upstream, upper ridging was building into the Pacific Northwest. An upper level ridge will remain situated over the western United States throughout the period.
A weak upper trough dropping south through the Great Basin area helped to energize some thunderstorms around northeastern Kern Co last night.
The second round will be the strong to severe thunderstorms this afternoon/evening along the SFC boundary/cold front. With that said, satellite does indicate clearing across western North Dakota, and current dewpoint values just ahead of the cold front are in the low to mid 60s.
Afternoon highs should have no problem reaching the lower 90s in most locations. One thing that will change today will be the slow return of southerly winds in response to a developing trough across the Central High Plains. The trough will move southeast tonight and reach North Texas on Saturday.
Mid level high pressure over the wern Atlantic will slide eastward as well as the full latitude trough around Harvey pushing east as well.
Quiet weather will persist through Friday night, with high pressure overhead.
Ridge/trough ridge/trough currently across the country. The Nam and Sref were doing a little better on the low level thermal field. Mid/upper level ridging and drying build into the area. Winds will be light and variable so lowered the lows a little from the builder gave me.
06Z surface data has high pressure over the northern Great lakes with a frontal boundary across the Plains and into the Ohio Valley. Quiet and dry conditions will be seen today and tonight as high pressure remains over the Great Lakes.
Model consensus timing of associated cold front indicates that the front will pass through early in the day, keeping temps from rising any higher than the upper 60s/lower 70s before at least slowly falling after fropa. Models advertise much cooler/fall conditions will follow on Tue under blustery n to nw winds/mostly cloudy skies and isolated/scattered showers. Expect dry/warmer conditions on Thu under westerly flow to the s of low pres moving e across far northern Ontario. Ahead of a cold front that will push east across the lake on Saturday, winds will become S-SW and increase to 20 to 30 knots tonight and Saturday.
A clearing line should move through Western Nebraska and part way through North Central Nebraska this afternoon supporting the warmer temperatures.
These clouds will also allow temps to be a deg or two cooler on Sat compared to what is expected this Fri afternoon.
Dry conditions will continue into Saturday with upper ridging building in from the west.
/Issued 344 AM CDT Fri Sep 1 2017/ Early this morning Eastern Oklahoma and Northwest Arkansas were between the remnants of tropical system Harvey well off to the east and a building ridge of high pressure off to the west.
/issued 300 AM CDT Fri Sep 1 2017/ A western ridge/eastern trough will persist in the mid and upper levels of the troposphere over the continental U.
Late yesterday into earlier tonight, when the circulation center was closer to the northern border of the CWA, the gradient winds were strong enough to down some trees (roughly near the Highway 82 corridor) but we expect the potential for that sort of wind strength has decreased now and will continue to decrease substantially as we go through the day.
This shows the main axis of the heaviest precipitation further east than previous model runs, however additional rainfall will continue as the low tracks across the area today. Models have slowed the movement of the low a bit, and have some additional backside rainfall developing later today, so looking at an additional half inch in the south up to 4 inches near the KY border of additional rainfall.
Very hot and dry weather for interior NorCal today and Saturday as strong high pressure covers the area. Temperatures are milder compared to 24 hours ago and range from the 40s in the mountain valleys to the lower 80s across milder portions of the Central Valley. Overnight lows will also be very mild with some areas in the thermal belts only dropping into the lower to mid 80s.
Water vapor imagery showing upper trof axis moving into the Front range with drying airmass behind it. North winds will develop at the surface behind the trough, bringing slightly cooler and drier low level air across the plains. With more sunshine, highs may wind up being only a couple degrees cooler than yesterday. Warmer and drier conditions will prevail through the weekend. The models continue to show a broad ridge of high pressure dominating the western U. The center of this ridge will be west of Colorado allowing for a weak north to northwesterly flow aloft over the cwa.
Winds were light along the I-65 corridor, but away from the low pressure center, winds were gusting over 30 mph. As the low pressure center drifts northeast through the day, the gusty winds will continue to spread into Mid TN areas away from the center of the low. Temps will not change much as clouds and showers hang around and cooler air wraps in from the northwest during the afternoon.
Models indicate high pressure will remain over the region. Very seasonal temperatures will continue, with highs today ranging from around 90 to the lower 90s and lows tonight mainly in the mid 60s.
/issued 303 AM EDT Fri Sep 1 2017/ High pressure, to the northeast, continues to hang around today. By Saturday, the remnants of Harvey will be moving into the Ohio River valley, and will work to break the high to the northeast down.
1048 AM EDT Fri Sep 1 2017 High pressure will pass over the area today, then the remnants of what was once Hurricane Harvey will track slowly across the Ohio Valley and cross the region this weekend. A cool start to the day (and also the new month) will be followed by a cooler than average day with gradually increasing cloudiness the remnants of Harvey trek slowly out of the Tenn River Valley. At the surface, high pressure will slide across the region.
Today through Tonight, A weak upper level trough was rounding a broad upper ridge axis across the central Rockies. This upper level trough is forecasted to dig southeast across the plains this afternoon and Tonight. Most numerical models show the greater amplification of this upper trough occurring across western KS into northern OK. During the late afternoon hours, as the H5 trough approaches western KS, the resulting ascent will cause showers and scattered thunderstorms to develop across west central KS and move southeast into the western counties of the CWA during the late afternoon and early evening hours. The more amplified section of the H5 trough will move southeast across southwest KS, south central KS and northern OK where the better ascent will occur and the deeper moisture return will be located. Lows Tonight will drop into the lower 60s.
Temperatures will be a few degrees warmer than yesterday, topping out in the lower to mid 70s. For tonight, high pressure slides eastward with a strengthening surface pressure gradient across the forecast area. A cold front sweeps across the area on Saturday.
831 AM EDT Fri Sep 1 2017 Cooler temperatures expected while the remnants of Harvey bring rain later today through much of the weekend.
Mid to upper level ridge will remain over northern Mexico into southwest Texas with the forecast area under a dry northwest flow aloft. Wind direction will be more easterly on Saturday that will cool the low level thermal profile along the coast. Expect highs will be 1-3 degrees cooler on Saturday.
as the center of the low lifts north and east across middle TN and into KY.
715 AM EDT Fri Sep 1 2017 Aviation A large Canadian Polar high pressure system is moving over Michigan today and will be east of this area by Saturday. Another Canadian Cold Front will bring the risk of showers and thunderstorms on Labor Day. The southerly flow ahead of the cold front will bring a surge of warm air allowing highs to reach the lower to mid 80s. Behind the front expect much cooler weather for mid week.
905 AM MDT Fri Sep 1 2017 Cold front has pushed through the area and we are already seeing some gusty NW winds in its wake, generally teens to mid 20s mph across our eastern cwa. Otherwise, quiet weather today with highs in the mid 80s to around 90F, a little cooler than the past few days, but still plenty warm for the 1st of September. With the gusty northwest winds, and minimum RH values expected to bottom out near 20 percent or less, have gone ahead and upgraded the Fire Weather Watch to a Red Flag Warning for the eastern Plains zones, including the lower elevations of Sheridan County. Ridging is progged to build back over the Northern Rockies for Saturday continuing the dry conditions and above normal temperatures, but decreasing winds as well.
With the day starting out with general westerly flow transitioning to southwesterly, guidance is advertising cooler air advecting to the area.
522 AM MDT Fri Sep 1 2017 Current surface analysis shows low pressure over far eastern MT, with cool front stretching southwest across WY. Above average temps can be expected across the area over the weekend as ridge rebuilds over the western US.
940 AM EDT Fri Sep 1 2017 High pressure across Canada today will build southeastward into our region through tonight.
741 AM EDT Fri Sep 1 2017 High pressure across Canada today will build southeastward into our region through tonight.
/Today through Tonight/ The frontal boundary that slid to our south yesterday lies across Missouri and Nebraska, around high pressure over the Great Lakes that will gradually push east as a low tracks across the Northern Plains. This will drive a warm front back north and east. Temperatures will be cooler today overall but the west may warm some, perhaps more than I have forecast, as the front will be near.
The highest rainfall totals thus far are a little over an inch, mainly from Breathitt to Jackson counties, where some more enhanced convection has been taking place at times through the overnight. Will maintain the Flash Flood Watch for now; however, the threat is lessening given the lower totals.
Ample insolation and the 850mb thermal ridge building into the area, expect temps to be more seasonable. Temps on Mon will actually be above seasonal average, expected to reach the low 90s in places just ahead of a cdfnt.
A high pressure system located over the western Atlantic is extending towards central Florida this morning and it will keep winds from the east to southeast this afternoon and through the weekend.
Other than areas of smoke, our weather will be clear, hotter, and drier through the Labor Day weekend as an upper high comes in from the west.
1221 PM EDT Fri Sep 1 2017 High pressure across Canada today will build southeastward into our region through tonight.
As high pressure rebuilds to the west with a northerly flow persisting over our area, the more stable air will lead to areas of smoke persisting through the overnight hours. The upper level trough will continue to drag across the southern half of the area, making slow progress to the east and south. WV satellite imagery shows frontolysis occurring at all levels so uplift from the trough is minimal. Further north and west cooler temperatures and more stable conditions will continue spreading over the area. After midnight tonight the trough should be south of the CO and UT borders and closed high pressure will once again take hold over the Great Basin. The strong ridge over the Great Basin will remain the dominant weather feature over the western U.
The low stratus and fog should burn off 14-15Z with VFR conditions prevailing through the remainder of the day. Upper air analysis last evening showed a trough extending from the upper Mississippi Valley to east Texas with northwesterly flow across our region. At the surface, high pressure was centered over Central Texas and winds across our CWA were light and variable. This will shift the low level flow around to the east through southeast.
/issued 407 AM CDT Fri Sep 1 2017/ SHORT TERM (Now through Saturday): As the weakening remains of Tropical Depression Harvey transition from the Mississippi River Valley to the Ohio River Valley, 500 mb high pressure over the western United States will nose into Deep South Texas and the Rio Grande Valley.
This trough has helped keep a northwest-ish flow in place across our section of the Plains States for many days now, which has kept our temperatures running just below normal lately; and this pattern looks to hold for at least one more day before beginning to flattening significantly as the trough, formally known as Harvey, moves east. as the trough moves east the ridge to the west will expand more fully into the Plains States, bringing a return of southerly winds over the weekend and into the beginning of the next work week.
Very dry column will then support clear skies below 30kft while building high pressure from the north supports persistent east or northeast wind around 8-12 kts. * None Strong Canadian high pressure establishes firm control to finish the work week, as the 1026 mb high center slowly expands across lake Huron through the day. This high tucked beneath confluent mid level northwest flow will sustain deep layered dry and stable conditions. Greater prospects for unfiltered sunshine with northwest extent, increasing the probability for warmer readings to focus over the Tri- cities.
1044 AM EDT Fri Sep 1 2017 High pressure across Canada today will build southeastward into our region through tonight.
A low pressure system will bring wintry weather to parts of central Indiana later Friday night into Saturday. /Rest of This Afternoon and Tonight/ Quiet weather will continue across central Indiana into the evening hours with high pressure remaining in control. Clouds will slowly increase across southwestern sections of the area as lift continues east of a warm front across Missouri. Some of the isentropic lift associated with the warm front will brush the far southwest forecast area late tonight, so will include some slight chance PoPs there late tonight. Went a little cooler than the blend for lows tonight east where clouds will be fewest.