Aikyam-Lab/Synoptic-Bench huggingface dataset:
High pressure ridging will loiter over the Northland this evening and Sunday morning with thin cirrus and light winds expected until late tonight. With clouds slow to expand northward tonight, lowered minimum temperatures in the Arrowhead into the middle to low 20s, a bit cooler than consensus guidance.
/Tonight through Sunday/ Area of low pressure over eastern Texas will lift north/northeast tonight and will be over far eastern Kansas by early Sunday morning then continue north into southwest Iowa by Sunday afternoon.
The main focusing mechanism for the convection across southeast Kansas is an inverted trough which extends north of a low which was centered over eastern Oklahoma. One thing of note was that on the back side of this trough, there was a small mesoscale area of northeast winds gusting over 40 knots. Strong cold advection behind the front will push temperature down toward freezing Sunday night across central Kansas.
/Issued 353 PM CDT Sat Apr 29 2017/ A closed upper low will track east out of the eastern Plains of New Mexico this evening into the Texas South Plains and then northward into the northeast Texas Panhandle late tonight and then into Kansas by Sunday morning. The rain mixed with snow may change over to snow across portions of the eastern Panhandles between 06Z and 12Z Sunday as the upper low lifts northeast and the cold sector north and west of the departing closed upper low moves across this area. Expect a tight gradient between the highest snowfall amounts northwest to lesser snowfall amounts across the remainder of the forecast area. Snow will likely melt first with temps above freezing, but as temps fall below freezing this evening and overnight tonight, expect snow to begin accumulating across the remainder of the Panhandles.
Meanwhile, the cold front continues to push across Texas this afternoon, and is to the Metroplex area at this time. Discrete thunderstorms are developing out ahead of the cold front. This cold front will move through our area tonight, and quickly exit during the day on Sunday. Temperatures tomorrow will likely be 10 to 20 degrees cooler than those of today, as much cooler and drier air filters in the region.
950 PM CDT Sat Apr 29 2017 The rapid southeasterly advance of the cold front is certainly doing a number on the (potential) convection this evening as it undercuts the line.
811 PM EDT Sat Apr 29 2017 High pressure will continue to ridge across the area through Sunday and keep dry and very warm conditions in place.
Cooler temperatures will occur tonight with a freeze expected in some colder eastern valleys. High pressure will bring dry conditions and a strong warming trend during the upcoming week. 19 inches) will translate into cooler temperatures later tonight. Sunny skies and warmer temperatures will then occur Sunday.
Cross sections overnight and low level pressure fields suggest that the pressure gradient in the lower boundary layer may not be as strong as what we have seen the last several mornings across our terminal airspace and this could directly effect whether or not we see IFR/MVFR ceilings after midnight across many terminals. Ridging aloft stretching from the southern plains into the Great Lakes region along with sfc ridging will build into the region on Friday.
The models show a weak inverted trough over the Atlantic pushing west and reaching the coast late. Prospects for higher coverage look to be a good bet on Fri as a trough aloft dropping into the northeast Gulf of Mexico provides destabilization while east flow spreads deeper moisture across the entire area. Coastal terminals would have the main chances in the morning and early afternoon, then inland terminals should have the highest chances in the afternoon. The pressure gradient will continue to tighten between high pressure over the eastern U.
A surface warm front will continue to lift north across the area tonight. The more concentrated activity looks to develop around/after 05z over central/northern MN/WI as the low level jet strengthens. Given the elevated dewpoints in the lower 70s, heat indices along and south of I-94 moderate into the 95 to 100 degree range. Given the breezy southerly winds, the true impact may be abated slightly, but Wet Bulb Globe temperatures still look to rise into the lower 80s across the metro area. The longer term concerns remain timing/evolution of the western conus trough and movement of the surface front.
737 PM EDT Thu Sep 21 2017 High pressure will continue to bring warm temperatures and mostly sunny days through the weekend. A large dome of high pressure along with a very warm air mass.
High pressure will weaken tomorrow and a trough will begin to move into the region.
921 PM EDT Thu Sep 21 2017 A mid to upper level trough will linger over the eastern Carolinas through the end of the week. Sheared remnants of the weak upper level low will linger across eastern NC as we begin to feel increasing influence of the strong mid-upper level ridge centered from the southern Plains to the Great Lake region. General troffing in the wake of Jose is pressed south as high pressure over the Great Lakes ridges south and drier air builds in for the upcoming weekend. This high pressure looks to remain over the area through the extended, pending any westward deviation in the forecast track of Maria, which is still progged to remain well offshore.
Weak high pressure continues to influence our weather pattern both at the surface and aloft, with isolated convection occurring mainly south of I-40.
949 PM EDT Thu Sep 21 2017 High pressure will prevail through this weekend. The high will weaken and shift inland as Hurricane Maria tracks northward off the Southeast U. A weak upper trough pattern and lingering low-level moisture on Friday will support isolated showers/tstms mainly in the afternoon associated with the sea breeze.
A cold core upper low developing over Nevada will drift slowly east across the Great Basin through the weekend. A longwave trough remains situated across the Great Basin this evening, anchored around an upper low spinning along the ID/NV border region.
628 PM CDT Thu Sep 21 2017 Jose and Maria still to the east underneath ridge. Deep trough extends from upper Hudson Bay through central Canada into Northern California. Transition continues with the upper pattern and deep trough through the western Conus. Much warmer over night lows forecast with lows ranging from 70 at Oneill to 45 at Gordon to 55 at Imperial. As upper trough approaches from the west and increased moisture advection into central plains through the weekend a prolonged period of moderate to heavy rain through southwest into North central Nebraska expected.
With diminishing winds and humidity rising with cooler temps, have allowed the Red Flag Warning to expire on time. Highly amplified upper trough will remain rather stationary on Friday with the axis across the Great Basin. Temps will be around 10-15 degrees cooler on Friday over the CWA, ending fire weather concerns. With increasing large scale ascent ahead of the trough during the aftn/evening, scattered showers and isolated thunder will be possible over mainly southeast Wyoming.
Upper level trough situated over the West tonight with two centers visible on the satellite imagery, one over central NV and the other just east of Boise. Showers will slowly taper off during the day on Friday as breezy northwest flow develops and the trough pushes east.
An upper level trough over the western U. Most of the CWA will be cooler on Friday (50s and 60s) but the southern James River Valley could see some readings near 80.
High pressure will be in control, and the forecast will be mostly a persistence one.
Freezing level quite high so will need tall ones to get large hail. Minimum temperatures will remain mild overnight over all but the far nw with thermal ridge axis in place, warm advection and low level moisture flux.
1133 PM CDT Thu Sep 21 2017 Jose and Maria still to the east underneath ridge. Deep trough extends from upper Hudson Bay through central Canada into Northern California. Transition continues with the upper pattern and deep trough through the western Conus. Much warmer over night lows forecast with lows ranging from 70 at Oneill to 45 at Gordon to 55 at Imperial. As upper trough approaches from the west and increased moisture advection into central plains through the weekend a prolonged period of moderate to heavy rain through southwest into North central Nebraska expected.
848 PM MDT Thu Sep 21 2017 Satellite imagery this evening shows closed mid-upper level low developing over the Great Basin within the SW extension of an elongated trough that extends NE into central Canada. Precipitation is increasing over SE ID and northern UT under favorable dynamics ahead of the low and this should translate north into SW MT over the next 3-6 hrs and continue to expand north into central MT after 09-12z as the closed mid level circulation drifts north into central ID. Surface boundary also noted moving south across N-central MT this evening, to supply some additional low level cooling as N/NE flow in the low levels increases over the forecast area. High temperatures are expected to be only in the 40s but warmer and drier conditions return for the weekend.
848 PM CDT Thu Sep 21 2017 Jose and Maria still to the east underneath ridge. Deep trough extends from upper Hudson Bay through central Canada into Northern California. Transition continues with the upper pattern and deep trough through the western Conus. Much warmer over night lows forecast with lows ranging from 70 at Oneill to 45 at Gordon to 55 at Imperial. As upper trough approaches from the west and increased moisture advection into central plains through the weekend a prolonged period of moderate to heavy rain through southwest into North central Nebraska expected.
Moisture is forecast to begin increasing over the state tomorrow afternoon in advance of the approaching upper trough that is now over Nevada. Temperatures will be a little cooler tomorrow, but still well above normal. Southwest flow aloft will increase over Colorado tonight and Friday as an upper level trough over the western states slowly progresses eastward.
A large elongated upper level trough over the region will close off overnight becoming a closed upper level low over southwest Idaho by Friday morning. However, there could be some lingering showers over the Wallowa and Elkhorn mountain areas as some moisture begins to wrap around the closed low and comes back into the area from Idaho.
Aloft, mid level trough extends from Carolinas southwest into the central FL panhandle. With increasing moisture coming in from the Atlantic and development of coastal trough, will maintain a chance of showers for the srn half of coastal waters later tonight into early Friday morning and also a small POP for the coastal counties of St Johns and Flagler.
516 PM MDT Thu Sep 21 2017 A large trough across the western CONUS will influence our weather through the upcoming weekend. At 19z a cold front had pushed through over 1/2 of the CWA and was from roughly KD07 to KIEN. Aloft, southwest flow will prevail with periodic short- wave troughs ejecting out of the western CONUS trough about every 24 hours.
703 PM CDT Thu Sep 21 2017 Expansive area of high pressure dominates the eastern half of the CONUS this afternoon as southwesterly flow stretches from the southern California coast into the Upper Midwest. The ridge is compressed slightly as it starts to break down. Another deep wave moves across southern Canada, bringing slightly cooler air behind a weak cold front midweek. Central IL then comes under the influence of the deep SWrly flow as the ridge shifts to the east coast and breaks down.
It looks like all of the late afternoon and early evening convection has gone to be for the night; save for a lone shower on the higher terrain in Unicoi County.
Expansive area of high pressure dominates the eastern half of the CONUS this afternoon as southwesterly flow stretches from the southern California coast into the Upper Midwest. The ridge is compressed slightly as it starts to break down. Another deep wave moves across southern Canada, bringing slightly cooler air behind a weak cold front midweek. Central IL then comes under the influence of the deep SWrly flow as the ridge shifts to the east coast and breaks down.
708 PM CDT Thu Sep 21 2017 A surface warm front will continue to lift north across the area tonight. The more concentrated activity looks to develop around/after 05z over central/northern MN/WI as the low level jet strengthens. Given the elevated dewpoints in the lower 70s, heat indices along and south of I-94 moderate into the 95 to 100 degree range. Given the breezy southerly winds, the true impact may be abated slightly, but Wet Bulb Globe temperatures still look to rise into the lower 80s across the metro area. The longer term concerns remain timing/evolution of the western conus trough and movement of the surface front.
1153 PM EDT Thu Sep 21 2017 Strong upper ridging will provide dry conditions during the forecast in terms of rainfall. However, with the long early fall night's and light/variable winds, expect patchy fog given the warm, humid airmass in place with this ridge. Dense fog is not expected at this time as some degree of cirrus arcs over area within upper level ridge. Area will be directly under the ridge Friday night, so calm winds may lead to a better chance at a period of dense fog. High amplitude upper ridging will govern conditions across the great lakes right through the upcoming weekend.
1013 PM EDT Thu Sep 21 2017 Data from the Key West evening radiosonde balloon reveals light northeasterly flow in the lower troposphere (045/08 knots), a favorable direction for migrating mainland cumulus convection and associated outflows to serve as an impetus for subsequent generation of cells over Florida Bay and the extreme southeastern Gulf of Mexico. North- northeast swells will persist in the Straits of Florida between the upper Florida Keys and the Bahama Banks, thanks to the third in a series of tropical cyclones turning northward across the western North Atlantic Ocean (Irma, Jose, Maria). The weather station there recorded a peak sustained wind of 122 mph, and a significant storm surge was reported in the lower Florida Keys including Key West.
Upper low will keep things rather cool on Friday with isolated to scattered showers.
Convection will gradually lift northward as a trough axis between PTC#10 and TS Harvey gradually lifts northward across NE FL and then across SE GA through the pre-dawn hours. After midnight a low chance of rainfall will continue mainly north of the I-10 corridor, with an increase in precip through sunrise possible along the SE GA coast where convergence along the trough axis will be strongest. Minimum temperatures will trend warmer tonight with lows in the low/mid 70s inland to upper 70s coast. Winds will veer ESE through the night as trough axis lifts northward over the waters.
An upper low pressure will continue to slowly push east yielding continued light northerly flow over the region through Wednesday afternoon. There is again potential for fog again over most of the region with the highest confidence being for areas along and north of interstate 70. With the ridge stuck between the two, portions of the CWA may see another round of fog late Wed night into Thurs morning. The 850mb thermal ridge does build into the area which shud push temps into the upper 80s.
At the same time, prominent mid-level ridging currently from the Four Corners to western Canada will temporarily break down as a multi-stream trough tracks across western and central Canada and the adjacent northern tier of U.
Wednesday very similar to today with isolated chances to the west along the trough axis. Highs slightly cooler with some higher clouds to the northwest and west.
1039 PM MDT Tue Aug 29 2017 A rinse-and-repeat forecast through Wednesday as a strong ridge of high pressure remains overhead. Moisture lingering under the ridge will continue to be recycled today and tomorrow to produce isolated showers and thunderstorms over the higher terrain. An upper level trough will elongate off the coast of the Pacific Northwest throughout the day on Wednesday. The progression of the trough further inland will help flatten the ridge for the latter half of the week.
815 PM EDT Tue Aug 29 2017 Fcst period will be characterized by a weakening ridge of high pressure as we say goodbye to the Fall-like cool/dry conditions between Harvey to the SW and an exiting low off the Carolina coast. With the lingering wedge of high pressure in the NE, we should stay primarily stable, though some southern and western areas could see enough instability realized to warrant a slight to low end chance of thunderstorms - only general in nature and no strong/severe threats this far away from the main Harvey circulation/helicity maximum.
908 PM CDT Tue Aug 29 2017 Weak low pressure just east of Illinois has kept some spotty clouds still lingering across eastern Illinois. Most areas are clear, with light northerly winds, due to high pressure centered in western Ontario Canada and extending south through Iowa and NW Illinois. Low temps look to settle out in the upper 50s to low 60s, and current dewpoints are in the low to mid 60s, so low level saturation looks likely.
Lows in the upper 50s to the lower 60s look good. High pressure will dominate over the area tonight, keeping conditions dry under mostly clear skies. Another area of high pressure will begin to drop out of Canada on Wednesday, with a weak frontal boundary pushing through ahead of it.
18Z surface data has high pressure running from the northern Great Lakes into the central Plains. The northern half of the area would be favored being under the high.
718 PM EDT Tue Aug 29 2017 A weak warm front will linger nearby through mid week before a cold front approaches from the north late in the week. But at the same time high pressure will build from the N, keeping any measurable rainfall south of the CWFA through daybreak. High pressure to the north will give way to some deeper moisture Wednesday north of a stationary front near the Gulf coast, which should push north into or even through the area Wednesday night as low pressure, once Hurricane Harvey, moves northeast from the Lower Mississippi Valley.
930 PM EDT Tue Aug 29 2017 A weak area of low pressure will continue east across the Ohio Valley tonight into Wednesday.
/issued 354 PM EDT Tue Aug 29 2017/ THIS AFTERNOON AND TONIGHT: We've settled more firmly back into a typical summertime pattern across South Florida today as the western Atlantic ridge axis begins to work its way north and west from its position over the Florida Straits. REMAINDER OF THE WEEK: Mid/upper level ridge will continue to build westward from the Atlantic through the remainder of the week.
909 PM EDT Tue Aug 29 2017 High pressure will remain over the region tonight through Wednesday while an ocean storm passes well to our south.
528 PM MDT Tue Aug 29 2017 A 594dm high pressure center remains centered over southwest Utah early this afternoon with northerly flow aloft over the area. The upper ridge is forecast to slowly move east tomorrow as an upper level trough and pacific cold front move onto the west coast. A few mid and upper level clouds will spill over the ridge and into the area from the north, especially Wednesday.
Chattanooga Airport, TN 70 76 70 78 / 20 70 70 80 Knoxville McGhee Tyson Airport, TN 66 80 68 76 / 10 60 70 70 Oak Ridge, TN 66 79 68 76 / 10 70 70 70 Tri Cities Airport, TN 62 80 65 77 / 10 30 50 70.
745 PM EDT Tue Aug 29 2017 Low pressure will track away from the Middle Atlantic coast tonight. High pressure will otherwise extend across the Middle Atlantic states through Wednesday. Convection is expected to develop invof a warm front lifting northward through MS/AL late Wed aft/eve as Harvey tracks slowly NNE into LA. Increasing cloud cover will result in warmer lows Wed night, in the mid/upper 60s.
Skies will clear from west to east this evening as the passing trough axis exits the area and debris from afternoon convection advects east. After, skies will begin to clear as drier air and weak high pressure build in. Fog will burn off quickly after sunrise Wednesday morning leading to a partly sunny day with highs rebounding to near 80 as warm advection picks up ahead of an approaching strong cold front.
935 PM EDT Tue Aug 29 2017 High pressure will keep the weather dry through Wednesday.
Cold front just across the International border along a line from Lake of the Woods to Hallock to Rolla and will continue to slowly drop southward throughout the night. CAMs continue to show most activity east of the forecast area as a cold front moves south out of Manitoba this evening. Less capping with cooler mid level temps to the northeast of the area will allow convection to develop. In its wake winds will be northeasterly tomorrow with 925mb temps 5 to 10C cooler than the today.
Light winds and low waves are expected again Wednesday under high pressure.
High pressure continues to dominate our weather with its axis right over our region. However, this will generally only impact the high country. Tomorrow a stronger disturbance will make its way out of the west to break down the ridge.
742 PM EDT Tue Aug 29 2017 Skies will clear from west to east this evening as the passing trough axis exits the area and debris from afternoon convection advects east. After, skies will begin to clear as drier air and weak high pressure build in. Fog will burn off quickly after sunrise Wednesday morning leading to a partly sunny day with highs rebounding to near 80 as warm advection picks up ahead of an approaching strong cold front.
824 PM CDT Tue Aug 29 2017 Light showers heading northward from a warm front over central AL shifting northward ahead of TS Harvey have already begun to affect Cullman County over the last hours.
The area continues to be in a light northerly flow with the upper levels and a dry northeast flow at the surface with high pressure across the Midwest.
Forecast remains on track with cold front now roughly halfway through the area (extending from northern Beltrami County down through Grand Forks then towards the Cooperstown area). Cold front has now made it about a third of the way southward across the area and should be into GFK shortly. Cold front just across the International border along a line from Lake of the Woods to Hallock to Rolla and will continue to slowly drop southward throughout the night. CAMs continue to show most activity east of the forecast area as a cold front moves south out of Manitoba this evening. Less capping with cooler mid level temps to the northeast of the area will allow convection to develop. In its wake winds will be northeasterly tomorrow with 925mb temps 5 to 10C cooler than the today.
Above normal temperatures will continue this week as strong high pressure remains firmly entrenched over the interior West. The potential for cooler temperatures and increasing moisture improves across the region by the weekend. A broad upper level high pressure is centered over the Great Basin this afternoon with showers and thunderstorms all pinwheeling around the center. Being on the southern periphery of this high, south-central Arizona has and will remain under a east to northeasterly flow aloft. Storms that are currently forming over the Rim this afternoon will gradually work their way south and west towards the lower elevations around Phoenix. However, given the DCAPE values, negatively buoyant rain cooled outflows from the higher elevations stand a chance of working their way down to Phoenix this evening. Very similar conditions are expected for tomorrow continuing the low grade monsoon weather pattern.
Weak cold front will continue to slide south through northern North Dakota this evening. A weak cold front across Saskatchewan and into Manitoba was pushing south. For Wednesday, cooler behind the front, 75 to 85, though closer to 90 southwest nearer the thermal ridge.
High pressure will dominate over the area tonight, keeping conditions dry under mostly clear skies. Another area of high pressure will begin to drop out of Canada on Wednesday, with a weak frontal boundary pushing through ahead of it.