Aikyam-Lab/Synoptic-Bench huggingface dataset:
1012 AM EST Thu Dec 3 2020 High pressure north of Florida will build offshore of the Mid- Atlantic coast through late day, with easterly winds across the area this afternoon. High pressure north of the region will maintain an easterly flow around 10-15kt across the coastal waters, with seas 3-4 feet.
921 AM PST Thu Dec 3 2020 Strong high pressure is expected through the weekend bringing a prolonged period of dry, stable, and seasonably cool conditions.
Ample warm air advection into the High Plains will push 850mb temperatures in the 8 to 11 degree C range into western Nebraska.
Main features of concern at the 500 mb level today are a ridge centered over ID, a closed low that stretches from parts of MO into OK and a trough from just east of Hudson Bay down into the Great Lakes region. That stretched out closed low was producing some spotty light precipitation and aviation concerns to our south but nothing for eastern NE or southwest IA. Surface analysis at 3 pm showed high pressure in place from the Pacific Northwest into TX, with our area in west/northwest low level flow.
142 PM CST Thu Dec 3 2020 The front edge of strong ridging aloft will continue to be the dominant, driving force for our weather in the short term. Given the dry airmass and low dewpoints, went a bit cooler than guidance for overnight lows, however. Highs should be around 50 degrees and warmer from the James Valley west on Friday, especially given the enhanced mixing from northwest breezes. A strong upper level ridge over the northern Rockies will cause a dry northwesterly flow aloft over the CWA.
With the bulk of the forcing east of the area and a dry atmospheric column, the only real impact will be a cold front being dragged through from north to south during the morning hours on Friday. Friday will likely be a few degrees cooler than today given cold air advection much of the day, with highs mainly in the 30s. Cloud cover will be a big question, as model guidance differs considerably on how extensive low-level moisture will be behind the cold front, with the RAP suggesting low clouds sink southward in the morning and make for a much cloudier day than the going forecast.
221 PM MST Thu Dec 3 2020 A Rex-Blocking pattern set up over the western CONUS leaves the CWA under fairly stagnant air flow and brings little change in weather for the next several days. The closed low to our south will drift further from the forecast area, pulling its cold air mass along with. As a result, warmer air under the high pressure to our north will nudge into the region aloft. full sun and diurnal mixing should transport some of the warmer air down to the surface. Warmer air will be more notably felt across the high country.
The front edge of strong ridging aloft will continue to be the dominant, driving force for our weather in the short term. Given the dry airmass and low dewpoints, went a bit cooler than guidance for overnight lows, however. Highs should be around 50 degrees and warmer from the James Valley west on Friday, especially given the enhanced mixing from northwest breezes. A strong upper level ridge over the northern Rockies will cause a dry northwesterly flow aloft over the CWA.
A ridge of high pressure will continue to be the dominant feature over the Northern Rockies for the next couple of days. This ridge will keep strong valley inversions in place as parts of north central Idaho and northwest Montana deal with patchy fog and low stratus clouds. Later tonight into Friday, a weak disturbance will make its way through the ridge causing an increase in high levels clouds. So temperatures tomorrow should be near to slightly cooler compared to todayâs readings.
A ridge of high pressure will continue to be the dominant feature over the Northern Rockies for the next couple of days. This ridge will keep strong valley inversions in place as parts of north central Idaho and northwest Montana deal with patchy fog and low stratus clouds. Later tonight into Friday, a weak disturbance will make its way through the ridge causing an increase in high levels clouds. So temperatures tomorrow show be near to slightly cooler compared to todayâs readings.
Lows may be a touch warmer as a result, with upper 20s looking likely.
226 PM PST Thu Dec 3 2020 Strong high pressure is expected through the weekend bringing a prolonged period of dry, stable, and seasonably cool conditions.
601 PM EST Thu Dec 3 2020 Mild high pressure will move east of the state tonight, bringing increasing clouds. Temperatures will be warmer then previous nights.
This low will intensify the rain across areas of North Mississippi and West Tennessee this evening as the low tracks northward. By the afternoon, some showers may develop across West Tennessee as the associated upper level low pressure moves over the Mid-South. Showers should dissipate by sunset as the upper low moves east.
/issued 413 PM CST Thu Dec 3 2020/ The cold front has remained stalled today across south central Louisiana with temperatures in the upper 60s to lower 70s generally east of the Mississippi river and 50s to the west. Cooler temperatures on tap for tomorrow morning with lows around 40 or so. winds will relax as the high settles in and the the gradient loosens.
An elongated upper low from Missouri to the Texas panhandle continues to pivot slowly eastward late this afternoon. with a trough/wind shift line noted from southeastern Missouri to the Gulf Coast. Meanwhile further north, a ridge of high pressure extends from the Carolinas northwestward into central Illinois. The clouds will hold firm across the E/SE CWA through Friday morning before skies clear from northwest to southeast later in the day as the upper low slowly departs.
632 PM EST Thu Dec 3 2020 Mild high pressure will move east of the state tonight, bringing increasing clouds. Temperatures will be warmer then previous nights.
834 PM EST Thu Dec 3 2020 High pressure will shift offshore tonight. A low pressure system will bring rain during Friday and Friday night.
Otherwise, easterly flow provided by high pressure centered just offshore of the Carolinas has been steadily modifying the low- level airmass through the day today by bringing in higher moisture from the Atlantic, but not enough for any shower development. This would bring temperatures a few degrees cooler than the forecast values at the coast, especially if there are some breaks in the cloud cover.
With the upper level low tracking east on Friday, we will stay under the dry northwest flow aloft most of the day.
525 PM MST Thu Dec 3 2020 A Rex-Blocking pattern set up over the western CONUS leaves the CWA under fairly stagnant air flow and brings little change in weather for the next several days. The closed low to our south will drift further from the forecast area, pulling its cold air mass along with. As a result, warmer air under the high pressure to our north will nudge into the region aloft. full sun and diurnal mixing should transport some of the warmer air down to the surface. Warmer air will be more notably felt across the high country.
413 PM CST Thu Dec 3 2020 The cold front has remained stalled today across south central Louisiana with temperatures in the upper 60s to lower 70s generally east of the Mississippi river and 50s to the west. Cooler temperatures on tap for tomorrow morning with lows around 40 or so. winds will relax as the high settles in and the the gradient loosens.
High pressure aloft over the Interior West will maintain dry conditions for the next several days.
Showers should spread across mid state region as evening, into Friday, and even into Friday evening across Cumberland Plateau Region as an upper level low pressure system approaches, moves across, and then pushes eastward of mid state region.
Extensive cloud cover across the region early this afternoon with upper low axis over the CWA. Did have some light snow last night, mainly over the higher terrain east of Springfield where a tenth of an inch up to near an inch of snow occurred, mainly over grassy areas. Temperatures mainly remained above freezing for the event which led to most of the snow melting as it reached near the ground. For tonight, the low stratus will likely persist through the night before beginning to diminish during the morning Friday. On Friday, we should see clearing in the morning hours with a mostly sunny sky developing by late morning through the afternoon, as the main upper low axis shifts east of the area.
Overnight temperatures will be noticeably warmer than previous nights as winds begin to shift more southeasterly and higher clouds continue to overspread the region.
939 PM EST Thu Dec 3 2020 Thickening clouds across the eastern Tennessee Valley tonight ahead of closed upper low over southern MO and northern AR.
For tonight, mid level clouds should overspread much of the rest of the region ahead of an approaching cold front. The cold front will drop southward across the area later tonight into Friday morning. Lows tonight will fall into the lower to middle 20s north and in the middle or upper 20s over the rest of the area. It will be cooler with highs around 30 across north-central Wisconsin while the rest of the region will see highs in the middle 30s to around 40.
While the timing and locations are suspect - the ECMWF does capture this well and each of the waves does appear to erode the Western US ridge. However arrival of cold front Fri aftn and contributing lake moisture will yield MVFR stratocu with time late aftn through evening.
434 PM MST Thu Dec 3 2020 Water vapor show upper ridge over the western CONUS that is highly amplified through the Northern Rockies. At the surface, rather large pressure gradient extends between a high over the Northern/Central Rockies to trof over the Great Lakes.
656 PM EST Thu Dec 3 2020 High pressure will shift offshore tonight. A low pressure system will bring rain during Friday and Friday night.
Upper-level ridge will continue to sit over the western U.
559 PM MST Thu Dec 3 2020 Strong high pressure aloft continues to dominate our weather (i. JKL Quiet weather will end the week and continue into the weekend as high pressure ridging will continue to dominate the northern Rockies.
408 PM EST Thu Dec 3 2020 Currently - High pressure beginning to move off the Carolina Coast is responsible for slowly weakening mostly easterly breezes. Dry air through the lower levels, a strong and fairly low level post cold front inversion, along with dew points broadly in the lower 60s have made it impossible for any showers. Forecast - The high near the Carolinas will move out into the Atlantic tonight into Friday and be replaced by a mid latitude low. As a result, a ridge extending from the departing high will slip southwards into South Florida and the Keys, causing winds to weaken further and veer south east by this weekend. The lower level ridge and associated dry air will remain across our area.
/issued 245 PM CST Thu Dec 3 2020/ WV imagery shows an elongated upper trough extending from MO southwest to southern NM, w/the southern lobe in the process of cutting off over northern Sonora. The ridge looks to generally remain in place through the weekend, w/no sign of appreciable return flow resuming anytime soon.
/Tonight through Friday Night/ Current analysis continues to show a closed low across Eastern Oklahoma/Western Arkansas, with a weak sfc boundary across the eastern half of the region. Light rain/drizzle has developed along the weakening boundary, generally east of a line from Natchitoches to Monroe, Louisiana, with additional light wrap around precip north of Interstate 30 in SE Oklahoma/SW Arkansas near the closed low. Slightly cooler and drier conditions to move in the region on Friday.
811 PM EST Thu Dec 3 2020 Mild high pressure will move east of the state tonight, bringing increasing clouds. Temperatures will be warmer then previous nights.
644 PM EST Thu Dec 3 2020 A mid-level low pressure center is slowly advancing eastward from the Oklahoma/Missouri border. While at the surface, a low pressure trough, ahead of the mid level low, is following the Mississippi and Ohio River Valleys northward. This trough is giving moisture a channel to be isotropically lifted, and as the system moves east, the CWA can expect increasing low level moisture which will result in lowering clouds and rainfall. Dry conditions should persist through the weekend as high pressure builds in from the west.
440 PM EST Thu Dec 3 2020 Mild high pressure will move east of the state tonight, bringing increasing clouds. Temperatures will be warmer then previous nights.
A stream of mid and high clouds will continue across the area as an upper trough to the west approaches the lower Ms River Valley. Temperatures will be warmer tonight than previous nights with lows Friday morning in the upper 40s over inland se Ga to the 50s across ne Fl. High pressure currently influencing the region will move off towards the northeast this evening shifting the prevailing flow to become more out of the southeast overnight. High temperatures for the afternoon are going to be in the 60s and potentially even the lower 70s for areas south of I-10.
543 PM CST Thu Dec 3 2020 An upper low will move through Arkansas tonight. Clouds will continue over the area with patchy light rain or drizzle until the low passes.
Expect this high cloudiness to continue through the overnight and into the day on Friday.
657 PM EST Thu Dec 3 2020 Cool temperature will continue, precipitation chances return on Friday and into the weekend as low pressure crosses the Ohio Valley. Overcast sky overnight will result in a low temperature near freezing tonight. Overall the pattern is looking warmer, and the progression is trending faster so the chance for lake enhanced snow showers following widespread rain/snow has decreased.
646 PM EST Thu Dec 3 2020 High pressure will persist through tonight.
347 PM PST Thu Dec 3 2020 Strong high pressure is expected through the weekend bringing a prolonged period of dry, stable, and seasonably cool conditions.
There is weak east and northeasterly flow aloft with upper level high pressure centered northwest of Colorado. Upper ridge of high pressure will continue to build over the Northern Rocky mountain region with a resulting decreasing northeast flow aloft over Colorado.
Closed upper low will continue to push into the MS river valley, spreading deep moisture into the mid-south through much of tomorrow. Cold front will move through the terminals during the mid to late morning hours with winds shifting to the WNW/NW.
404 PM MST Thu Dec 3 2020 The CWA was sandwiched between a upper ridge over the western CONUS and upper trough from the Great Lakes to the southern Great Plains. Some thin cirrus clouds were spreading northeast to southwest over the high plains.
High pressure will rebuild Friday and then weaken.
520 PM CST Thu Dec 3 2020 An area of mainly mid/high clouds dropping down the ridge centered to our west will continue to move through the eastern portion of the area into this evening, otherwise mostly clear skies will predominate through the short term. We'll remain under the influence of dry northwesterly flow aloft as weak surface ridging slowly builds in from the west.
723 PM EST Thu Dec 3 2020 Light band of precip associated with weak warm advection and a sfc trof now pushing across central Kentucky. A mid-level low pressure center is slowly advancing eastward from the Oklahoma/Missouri border. While at the surface, a low pressure trough, ahead of the mid level low, is following the Mississippi and Ohio River Valleys northward. This trough is giving moisture a channel to be isotropically lifted, and as the system moves east, the CWA can expect increasing low level moisture which will result in lowering clouds and rainfall. Dry conditions should persist through the weekend as high pressure builds in from the west.
Closed upper low will continue to push into the MS river valley, spreading deep moisture into the mid-south through much of tomorrow.
/issued 954 PM CST Thu Dec 3 2020/ A positively-tilted upper low will slowly move from the Ozarks to the MO bootheel through 9 AM Friday. The low level warm conveyor belt and associated rain will also shift east, with patchy drizzle possible behind the exiting rain shield. This low will intensify the rain across areas of North Mississippi and West Tennessee this evening as the low tracks northward. By the afternoon, some showers may develop across West Tennessee as the associated upper level low pressure moves over the Mid-South. Showers should dissipate by sunset as the upper low moves east.
147 AM CST Fri Dec 4 2020 Quiet weather continues with warmer than normal temperatures.
Daytime temperatures will slowly moderate, staying cooler along and northeast of the Mogollon Rim.
1126 PM CST Thu Dec 3 2020 An upper low pressure system will move across Arkansas tonight with quite a few clouds. Patchy drizzle or freezing drizzle will be possible overnight. An upper low will move through Arkansas tonight. Clouds will continue over the area with patchy light rain or drizzle until the low passes.
1147 PM CST Thu Dec 3 2020 Cold front clearly indicated by radar moving through KASD and east of KNEW as of 0530Z and should be through KGPT by around 07Z.
Light band of precip associated with weak warm advection and a sfc trof now pushing across central Kentucky. A mid-level low pressure center is slowly advancing eastward from the Oklahoma/Missouri border. While at the surface, a low pressure trough, ahead of the mid level low, is following the Mississippi and Ohio River Valleys northward. This trough is giving moisture a channel to be isotropically lifted, and as the system moves east, the CWA can expect increasing low level moisture which will result in lowering clouds and rainfall. Dry conditions should persist through the weekend as high pressure builds in from the west.
1028 PM CST Thu Dec 3 2020 An area of mainly mid/high clouds dropping down the ridge centered to our west will continue to move through the eastern portion of the area into this evening, otherwise mostly clear skies will predominate through the short term. We'll remain under the influence of dry northwesterly flow aloft as weak surface ridging slowly builds in from the west.
As the mid to upper level low moves into northwest Mexico tonight into Friday, some cirrus will move out of Mexico into the region in the southwest flow aloft through the period.
808 PM MST Thu Dec 3 2020 Sharp upper ridge is parked over the Rockies with cyclonic north flow over the forecast area.
1023 PM EST Thu Dec 3 2020 Mild high pressure will move east of the state tonight, bringing increasing clouds. Temperatures will be warmer then previous nights.
Full sunshine will combine with a NWly downslope component of 10-15 mph to allow for significant warming of the lower troposphere Friday. Undercut guidance across Meade/Clark/Comanche counties and adjacent areas, where the refrigeration effect of melting snowpack will keep temperatures in the lower 40s at best.
The precipitation is mainly east of the upper low over the MO bootheel. HRRR not really offering support and it looks a little questionable in regard to freezing level heights.
254 AM CST Fri Dec 4 2020 A weak cold front will drop south through Illinois this afternoon. Clouds and precipitation associated with a low pressure system passing by to the south of Illinois has not produced much in the way of cloud cover for our CWA so far overnight. No precipitation will develop this far north, despite a cold frontal passage progged to occur from north to south this afternoon.
944 PM PST Thu Dec 3 2020 Strong high pressure is expected through the weekend bringing a prolonged period of dry, stable, and seasonably cool conditions.
1024 PM MST Thu Dec 3 2020 A Rex-Blocking pattern set up over the western CONUS leaves the CWA under fairly stagnant air flow and brings little change in weather for the next several days. The closed low to our south will drift further from the forecast area, pulling its cold air mass along with. As a result, warmer air under the high pressure to our north will nudge into the region aloft. full sun and diurnal mixing should transport some of the warmer air down to the surface. Warmer air will be more notably felt across the high country.
324 AM EST Fri Dec 4 2020 A strong upper closed low will rotate from the lower MS River Valley into the southern Appalachians during the short term. there could be some instability developing mainly this afternoon as the warm front tries to move north.
IFR is not as likely, but the MVFR deck arriving continues to be eaten by the expanding and cooler clear areas. Nice wknd coming with chilly temps, but not expecting anything but VFR with frosty a morning and partly cloudy aftn, then late Sat another upper low on approach from TX bringing IFR/MVFR overnight.
1256 AM EST Fri Dec 4 2020 Precipitation chances return south of I-70 this morning as low pressure crosses the Ohio Valley. Overcast sky overnight will result in a low temperature near freezing early this morning. Overall the pattern is looking warmer, and the progression is trending faster so the chance for lake enhanced snow showers following widespread rain/snow has decreased.
238 AM EST Fri Dec 4 2020 Elongated vortmax centered over southern MO this hour will get a push eastward as a longer-wave trough dives into the Midwest.
850 mb temps down to around -10 C in this trough atop lake surface temps around 5 C will support modest lake-effect delta T's today, although saturation is shallow in model soundings. At first glance this could introduce the change for some freezing drizzle as well.
1240 AM EST Fri Dec 4 2020 High pressure will persist through tonight.
Thickening clouds across the eastern Tennessee Valley tonight ahead of closed upper low over southern MO and northern AR. Showers will develop ahead of a cold front late tonight through Friday. Garuckas Chattanooga Airport, TN 52 37 52 31 51 / 80 30 0 0 0 Knoxville McGhee Tyson Airport, TN 50 37 48 29 48 / 80 50 10 0 0 Oak Ridge, TN 49 35 48 29 48 / 80 50 0 0 0 Tri Cities Airport, TN 51 36 44 26 46 / 80 80 20 0 0.
Morning GOES water vapor depicts upper low rotating over southern MO. Another quiet and mostly sunny day is forecast, as the upper low over southern MO tracks east and remains southeast of the local area. Near meridional flow aloft and light north winds around 5 mph will allow temps to drop into the lower 20s overnight tonight, with clear skies.
/Issued 1152 PM CST Thu Dec 3 2020/ /Through Friday Night/ Low clouds will continue to clear from west to east overnight as large scale subsidence increases behind a departing upper low.
While the timing and locations are suspect - the ECMWF does capture this well and each of the waves does appear to erode the Western US ridge. A positively tilted upper level trough across the lower MS Valley will shift across the Tennessee Valley today which will eventually suppress better low level moisture transport south of northern Indiana today. Otherwise, Great Lakes upper trough sinking southeast will allow sfc cold front to drop across northern Indiana this afternoon. Southwest winds may gust into the 15 to 20 knot range preceding the front for a few hours late morning into early afternoon before sfc pressure gradient slackens with the approaching trough.
954 PM CST Thu Dec 3 2020 A positively-tilted upper low will slowly move from the Ozarks to the MO bootheel through 9 AM Friday. The low level warm conveyor belt and associated rain will also shift east, with patchy drizzle possible behind the exiting rain shield. This low will intensify the rain across areas of North Mississippi and West Tennessee this evening as the low tracks northward. By the afternoon, some showers may develop across West Tennessee as the associated upper level low pressure moves over the Mid-South. Showers should dissipate by sunset as the upper low moves east.
A blocking ridge and northwest flow pushes in cool dry air from the Northern Rockies.
205 AM CST Fri Dec 4 2020 A cold front over Lake Superior will drop southward through the area this morning.