Aikyam-Lab/Synoptic-Bench huggingface dataset:
The passing cold front is already southeast of Lexington and Bowling Green, and current METARs are showing dew point drops of up to 20 degrees with mostly clear skies behind the line. As of 630Z, regional observations place the SW-NE oriented cold front just north of the Ohio River. Cold front will continue to push SE across central KY this morning and pass to our east later this afternoon with clearing skies and lower dew points in its wake. Highs today should reach into the low 80s for most. Broad high pressure is expected to hold sway across the region for much of this forecast period. Mostly sunny skies are expected for Saturday with highs in the upper 70s to the lower 80s. Lows Saturday night look to drop into the low-mid 50s.
255 PM MDT Fri Sep 4 2020 High pressure will dominate through Saturday.
1115 AM EDT Fri Sep 4 2020 The passing cold front is already southeast of Lexington and Bowling Green, and current METARs are showing dew point drops of up to 20 degrees with mostly clear skies behind the line. As of 630Z, regional observations place the SW-NE oriented cold front just north of the Ohio River. Cold front will continue to push SE across central KY this morning and pass to our east later this afternoon with clearing skies and lower dew points in its wake. Highs today should reach into the low 80s for most. Broad high pressure is expected to hold sway across the region for much of this forecast period. Mostly sunny skies are expected for Saturday with highs in the upper 70s to the lower 80s. Lows Saturday night look to drop into the low-mid 50s.
912 AM MDT Fri Sep 4 2020 With quiet weather under a building ridge, the forecast looks on track with no need to update. Reimer High pressure will continue to build through the short term forecast.
1243 PM CDT Fri Sep 4 2020 Quiet weather will continue through Saturday as very strong high pressure remains over much of the western and central US. In addition to dry conditions, this high pressure will allow for warm air advection to surge northward into the northern and central Plains. Moderate winds on both Friday and Saturday afternoons will keep heat indices slightly cooler than forecasted highs on both days.
Strong upper level ridge will prevail tonight through Saturday. On Saturday, winds aloft increase and decent mixing progged on soundings in the afternoon as weak disturbance flattens ridge.
309 PM CDT Fri Sep 4 2020 The short term looks to remain rather quite with strong ridging building into the region.
1243 PM CDT Fri Sep 4 2020 Today will start out dry, as we remain upstream of a trough. Expect skies to clear out tonight, with temps dropping to the low to mid 40s. The trend of quiet weather continues into Saturday, as high pressure builds over the area. With the trough downstream of the CWA moving further east on Saturday, highs will be slightly warmer with temps in the upper 60s to low 70s. The next chance for precip in the short term comes late Saturday night, as low pressure approaches the area from the southwest along with another low pressure to the northwest of the area.
104 PM EDT Fri Sep 4 2020 High pressure will lead to dry and less humid weather through the weekend. A few showers will linger through the early afternoon hours in Tucker County as a cold front completes its passage. High pressure will continue to dominate the region through the period, keeping mostly dry weather in the forecast.
1234 PM CDT Fri Sep 4 2020 As of 08Z Friday morning a stout midlevel ridge continues to dominate the western third of the US, while troughing continues across the eastern two-thirds. Surface ridging will slowly progress eastward today, yielding mostly sunny skies and dry conditions. The aforementioned western ridge axis will regress westward, allowing a more-active pattern to setup across the forecast area.
1225 PM CDT Fri Sep 4 2020 Latest surface analysis is showing that the surface front has moved into southern Missouri with high pressure centered over eastern Nebraska. Highs today will be cooler behind the front, but then warm back up tomorrow in warm aid advection on the back side of the high.
Current temperatures range from the lower 70s in in west Tennessee and northeast Arkansas with upper 70s in northern Mississippi. The big story today is the passage of a late summertime cold front through the area bringing with it drier and cooler conditions along with lower humidity values. Lower dewpoints are slowly start to move into NE Arkansas and the Bootheel behind the aforementioned cold front. We will get our first taste of fall over the next few days due to the presence of high pressure.
Strong high pressure aloft is creating large scale subsidence over the forecast area and this will persist into tomorrow with another day of oppressive heat for early September with highs generally in the mid 90s.
Together these features are supporting development of scattered light sprinkles/showers, but so far reports of anything reaching the ground have been few and far between due to pronounced dryness in the low levels. Weak return flow will develop during the afternoon as the high is quickly displaced eastward by a strengthening low over the Plains. Low pressure system is still on track to move eastward across the northern Great Plains towards the Great Lakes region into southern Canada.
It's been a dry/quiet weather day with a warming trend in temps with increasing southerly low level flow and rising heights aloft as upper ridging builds east of the Rockies. Saturday, the western upper ridge axis dampens as energy moves into the Pacific Northwest which will allow the heat to crank up across our region as the warmer air to the west advects eastward onto the plains.
High pressure will result in slightly below normal temperatures and lower humidity through the weekend. Values will climb slowly as the high moves east.
610 PM CDT Fri Sep 4 2020 A cold front is drifting SW early this evening.
This evening into tonight a high pressure continues to slowly make its way across the upper Midwest. As the high moves through, surface and mid level flow will shift to the south, advecting warmer and more humid air into the region.
942 PM EDT Fri Sep 4 2020 High pressure builds in from the west and keeps the forecast dry over the weekend with below seasonal temps to start.
/issued 245 PM CDT Fri Sep 4 2020/ WV imagery shows an upper ridge centered west of the Four Corners, and another ridge over the SE CONUS, w/an inverted trough sandwiched in between over SE Texas. The inverted trough runs SW-NE thru Texas, favoring the Big Bend Are/lwr Trans Pecos for convection over the weekend.
At mid afternoon, a cold front had moved through Clarksville and Nashville, and the front will continue to sweep across the southeast half of the area before dark.
Deep easterly flow prevails over the region, with the subtropical ridge at the surface and aloft extending from the western Atlantic across north Florida and along the northern Gulf coast. 71 inches, with considerable dry air in the lower/mid levels (850-500 mb).
/issued 243 PM CDT Fri Sep 4 2020/ Quiet afternoon and night ahead as the upper high centered near the CA/NV state line continues to expand.
831 PM EDT Fri Sep 4 2020 A quiet night is underway as cooler and drier air moves in. 19z sfc analysis shows a cold front settling through eastern Kentucky with a broken line of showers and thunderstorms. Dewpoints, meanwhile, vary across the front from the mid 50s northwest to the lower 70s in the southeast. The models remain in good agreement aloft through the short term portion of forecast as the main trough descends deeper into the Ohio Valley.
The short term period will see the upper ridge over the western US building east out into the central and southern Plains. This will bring warmer temperatures back into the region as heights/thickness values increase. This along with increasing dewpoints will result in a warmer night tonight and Saturday night with lows generally in the 60s to around 70. The upper ridge over the western states retreats farther west to along and west of the California Coast and builds farther north into the Gulf of Alaska by Labor Day while a trough develops over Canada.
745 PM EDT Fri Sep 4 2020 High pressure will lead to dry and less humid weather through the Labor Day weekend. Building high pressure with light wind, lower dewpoints, and clear skies should provide efficient radiational cooling through the overnight, with temperatures likely to dip several degrees below model guidance especially across higher terrain. High pressure will continue to dominate the region through the period, keeping mostly dry weather in the forecast.
752 PM EDT Fri Sep 4 2020 A cold front will move through the area tonight and bring slightly cooler and drier air for the Labor Day weekend. This boundary will bring some relief from the string of very hot/uncomfortable days with high temperatures 5-10 degrees cooler Saturday.
532 PM EDT Fri Sep 4 2020 High pressure will lead to dry and less humid weather through the Labor Day weekend. Building high pressure with light wind, lower dewpoints, and clear skies should provide efficient radiational cooling through the overnight, with temperatures likely to dip several degrees below model guidance especially across higher terrain. High pressure will continue to dominate the region through the period, keeping mostly dry weather in the forecast.
551 PM CDT Fri Sep 4 2020 Weak trough moving through the area late this afternoon leading to a subtle wind shift with southwesterly winds becoming westerly. Overnight, a meso high pressure system will build into the northern plains leading to decreasing winds overnight and good radiative conditions. On Saturday, a warm front currently across the Central Plains will lift north through much of the forecast area. Moisture across the central plains is expected surge northward behind the warm front. By late in the day, ribbon of ~1500 J/kg of elevated CAPE develops behind warm front.
The main mid- level trough axis supporting all of this is still over Texas and is expected to slide farther south with a very weak associated frontal boundary at the surface. As for temperatures, the increased moisture, cloud coverage, and rain chances should lead to relatively cooler temperatures in the upper 80s for most of the region. Overnight lows a bit tricky depending on the boundary, however will keep rather cooler nights inland in the lower to mid 70s inland with temps in the 80s along the coast.
1052 PM EDT Fri Sep 4 2020 High pressure will build into the region tonight, supplying the area with fair weather and much lower humidity that will last through the long holiday weekend. High pressure ridge and associated low-pwat air mass will settle south across Pennsylvania overnight, providing the area with clear skies and a diminishing breeze. Expect lows to range from the low to mid 50s across most of central and southern Pa. After a cool start to the day, expect temperatures to rebound quickly due to abundant sunshine and a return west-southwest flow, as high pressure slip south of the state. Mixing down ensemble mean 800mb temperatures of 6-7C supports high temperatures ranging from the low 70s over the northwest mountains, to around 80F throughout the Susq Valley.
A cold front will move through mid week, leading to the return of fall like temperatures. Expect a quiet night as high pressure drifts across the region. A broad upper trough will continue the NW to W upper flow over the area, keeping temperatures near normal this weekend.
The Atlantic ridge axis will remain draped across central FL through Saturday.
726 PM EDT Fri Sep 4 2020 High pressure builds in from the west and keeps the forecast dry over the weekend with below seasonal temps to start.
717 PM EDT Fri Sep 4 2020 High pressure will build into the region tonight, supplying the area with fair weather and much lower humidity that will last through the long holiday weekend. High pressure ridge and associated low-pwat air mass will settle south across Pennsylvania overnight, providing the area with clear skies and a diminishing breeze. Expect lows to range from the low to mid 50s across most of central and southern Pa. After a cool start to the day, expect temperatures to rebound quickly due to abundant sunshine and a return west-southwest flow, as high pressure slip south of the state. Mixing down ensemble mean 800mb temperatures of 6-7C supports high temperatures ranging from the low 70s over the northwest mountains, to around 80F throughout the Susq Valley.
A strong cold front marking the leading edge of a much cooler and drier air mass will push across NC tonight. Canadian high pressure will build into the region through the weekend. Radar echoes continue to be few and far between across North Carolina in advance of an approaching cold front. After the cold front pushes across the region late tonight, a developing northeast breeze will begin to transport a cooler and drier air mass into the region with lows reaching the upper 60s to lower 70s by daybreak Saturday. A Canadian high pressure system with the first surge of autumnal air will build into the area on Saturday and Saturday night. Early Saturday morning will feel noticeably less humid and cooler than previous days, especially in the northwest and northern Piedmont.
Mainly some gustier south winds overnight over the higher ridges and hilltops across SE Montana. Chambers High pressure will dominate through Saturday.
939 PM EDT Fri Sep 4 2020 A cold front will move through the area tonight and bring slightly cooler and drier air for the Labor Day weekend. This boundary will bring some relief from the string of very hot/uncomfortable days with high temperatures 5-10 degrees cooler Saturday.
918 PM CDT Fri Sep 4 2020 A cold front has pushed through the region and is bringing some welcome drier (and slightly cooler) air in its wake. By early Saturday morning, temperatures will have dropped into the lower 60s in moat locations -- and wouldn't be totally shocked to see a couple upper 50s reading across southern middle Tennessee. Blended guidance trended a little warmer with this run, but is still reasonable, and consistent with a general cool bias behind late summer/early fall fronts. The high pressure responsible for the dry and pleasant conditions over the weekend will slowly start to drift east toward the Atlantic on Labor Day. As this high continues to drift east, a fairly strong trough will begin to deepen over the Central Rockies, resulting in abnormally cool temperatures over the Great Plains.
A very strong mid level ridge is currently centered across the Great Basin. The edge of this ridge will subtly stick out across far western Kansas and eastern Colorado. lee troughing will prevail over the weekend. Highs today should peak in the lower to mid 90s.
High pressure centered near the confluence of the Mississippi and Ohio Rivers extends its axis northeastward into New England today. On the north side of this high we will continue to see a westerly wind flow with dry conditions prevailing. A broad upper trough centered in northeast Quebec and Labrador extends its influence southward over the northeast US providing seasonably cool temperatures.
Forecast is on track this evening with a cold front moving east of the area and drier, cooler air advecting from the NW. With a clearing sky, temperatures will be much cooler and closer to normal, especially for sheltered valleys where winds are lighter. Cold front has now passed through the entire area with northerly winds around 5-10 knots. Diegan Chattanooga Airport, TN 86 64 88 65 88 / 0 0 0 0 0 Knoxville McGhee Tyson Airport, TN 82 59 87 63 88 / 0 0 0 0 0 Oak Ridge, TN 83 59 87 62 88 / 0 0 0 0 0 Tri Cities Airport, TN 80 56 84 59 86 / 0 0 0 0 0.
349 AM EDT Sat Sep 5 2020 A cold front will become stationary south of the area today.
1133 PM EDT Fri Sep 4 2020 High pressure will maintain mainly dry and less humid weather through the Labor Day weekend. High pressure should maintain dry weather tonight as it builds across the region. High pressure will continue to dominate the region through the period, keeping mostly dry weather in the forecast.
A seasonably strong upper level ridge is centered near the Four Corners region, with another broader and somewhat weaker ridge positioned across the southeastern CONUS. Meanwhile, a deeper trough is spiraling across Hudson Bay/Quebec, allowing for broad cyclonic flow extending southward all the way into the Tennessee Valley. At the surface, high pressure is centered across the Ohio Valley, with ridging generally sprawled across most locations east of the Rockies. A much cooler air mass has moved into eastern Kentucky, with temperatures ranging from the mid 50s to lower 60s.
Upper level RAP analysis places large-scale troughing from the Hudson Bay south into the Great Lakes and Tennessee valley. A ridge of high pressure is observed across the western US and extending from the western Atlantic and into the northern GoM. A surface cold front that moved through the region yesterday afternoon continues to shift east this morning as high pressure settles into the Ohio valley. Dry weather will continue through the short term period as high pressure brings subsidence to the region. Highs today will be a bit cooler with much lower dewpoints leading to more comfortable weather. Overnight lows will be cooler with lows in the middle 50s to lower 60s.
Even though some uncertainties remain in the strength and orientation of the low level jet, the best chance of showers and thunderstorms will occur south of I-94 between 9 PM and 6 AM. Heavy rainfall remains another severe weather element which could be very significant if training of the storms becomes oriented along the low level jet. The setup remains very strong on storms redeveloping along the western periphery, or the nose of the low level jet and the steering upper level flow to the southeast.
317 AM CDT Sat Sep 5 2020 Large upper ridge is currently centered over the Desert Southwest/Central Great Basin with broad upper troughing across the Great Lakes into the Ohio Valley. At the surface, lee troughing is in place with a weak warm front from southwest Nebraska into southeast KS. Upper ridging is expected to remain over the southwest CONUS and expand into the central/southern High Plains. This will allow a cold front to start to push south across the northern Plains with a tight pressure gradient across the forecast area. By 12z Fri the ECMWF has the upper low over eastern IA/western IL while the GFS has the same low over central Nebraska. Recent satellite imagery suggests the low-level moistening may be a bit delayed than earlier thought, and the TAFs were updated to reflect this trend.
Pleasant weather continues across central Indiana as high pressure briefly moves through central Indiana.
200 AM MDT Sat Sep 5 2020 Latest upper air analysis shows the ridge is now centered over the Great Basin, with northwest flow over the Plains. At the surface the high pressure was continuing to slide east of the forecast area. Tonight lows will be warmer than last night due to weak WAA and higher dew points.
259 AM EDT Sat Sep 5 2020 Synopsis/Discussion/Marine A cold front moves through today with light showers this morning and early this afternoon.
240 AM MDT Sat Sep 5 2020 08z surface analysis had low over central MT with warm front/lee trough into western NE. Pleasant night across the CWA with a few high clouds passing by as they overtop upper ridge in place over the southern Rockies per water vapour loop. Today, upper/thermal ridge peaks over the CWA with 95th+ percentile 700mb temperatures of 14-18C. Warm front will push east across the area with deeply mixed very dry boundary layer behind it. Tonight, upper ridge flattens as it shifts west in response to falling heights over western Canada into the northern plains. This will allow a cold front to slip into the CWA late.
1029 PM CDT Fri Sep 4 2020 Weak trough moving through the area late this afternoon leading to a subtle wind shift with southwesterly winds becoming westerly. Overnight, a meso high pressure system will build into the northern plains leading to decreasing winds overnight and good radiative conditions. On Saturday, a warm front currently across the Central Plains will lift north through much of the forecast area. Moisture across the central plains is expected surge northward behind the warm front. By late in the day, ribbon of ~1500 J/kg of elevated CAPE develops behind warm front.
116 AM EDT Sat Sep 5 2020 High pressure will build into the region tonight, supplying the area with fair weather and much lower humidity that will last through the long holiday weekend. High pressure ridge and associated low-pwat air mass will settle south across Pennsylvania overnight, providing the area with clear skies and a diminishing breeze. Expect lows to range from the low to mid 50s across most of central and southern Pa. After a cool start to the day, expect temperatures to rebound quickly due to abundant sunshine and a return west-southwest flow, as high pressure slip south of the state. Mixing down ensemble mean 800mb temperatures of 6-7C supports high temperatures ranging from the low 70s over the northwest mountains, to around 80F throughout the Susq Valley.
322 AM EDT Sat Sep 5 2020 A cold front drops south of the area this morning, bringing pleasant weather through the holiday weekend. A cold front will drop south of the local area this morning.
315 AM EDT Sat Sep 5 2020 A cold front will push through this morning, bringing slightly cooler and drier air this Labor Day weekend. KLTX VWP confirms northerly flow of wind in the low levels of the atmosphere presently.
242 AM EDT Sat Sep 5 2020 High pressure will maintain mainly dry and less humid weather through the Labor Day weekend. High pressure should maintain dry weather tonight as it builds across the region. High pressure will continue to dominate the region through the period, keeping mostly dry weather in the forecast.
Upper level ridging over our area will break down later today as a trough digs down the Atlantic seaboard into the southeast.
226 AM EDT Sat Sep 5 2020 High pressure builds in from the west and keeps the forecast dry over the weekend with below seasonal temps to start.
1242 AM CDT Sat Sep 5 2020 A cold front has moved through much of Arkansas and drier air is filtering in behind it. A cold front is drifting SW early this evening.
300 AM EDT Sat Sep 5 2020 High pressure will maintain mainly dry and less humid weather through the Labor Day weekend.
1118 PM EDT Fri Sep 4 2020 High pressure will build into the region tonight, supplying the area with fair weather and much lower humidity that will last through the long holiday weekend. High pressure ridge and associated low-pwat air mass will settle south across Pennsylvania overnight, providing the area with clear skies and a diminishing breeze. Expect lows to range from the low to mid 50s across most of central and southern Pa. After a cool start to the day, expect temperatures to rebound quickly due to abundant sunshine and a return west-southwest flow, as high pressure slip south of the state. Mixing down ensemble mean 800mb temperatures of 6-7C supports high temperatures ranging from the low 70s over the northwest mountains, to around 80F throughout the Susq Valley.
251 AM EDT Sat Sep 5 2020 A cold front will become stationary south of the area today.
A cold front has pushed through the region and is bringing some welcome drier (and slightly cooler) air in its wake. By early Saturday morning, temperatures will have dropped into the lower 60s in moat locations -- and wouldn't be totally shocked to see a couple upper 50s reading across southern middle Tennessee. Blended guidance trended a little warmer with this run, but is still reasonable, and consistent with a general cool bias behind late summer/early fall fronts. The high pressure responsible for the dry and pleasant conditions over the weekend will slowly start to drift east toward the Atlantic on Labor Day. As this high continues to drift east, a fairly strong trough will begin to deepen over the Central Rockies, resulting in abnormally cool temperatures over the Great Plains.