Aikyam-Lab/Synoptic-Bench huggingface dataset:
920 AM CDT Tue May 4 2021 An overcast day is in store across central Illinois as low pressure tracking through the Ohio River Valley brings showers to much of the area. Precip chances will end late this evening as the main H5 trough finally passes overhead. 08z/3am surface analysis shows a cold front extending from eastern Michigan southwestward to Texas. While dry condtions are currently being observed, waves of low pressure riding along the slowly advancing front will spread showers back into the area later this morning. High temperatures will be suppressed in the upper 50s and lower 60s, with slightly warmer middle 60s south of I-70. Lows will range from the lower 40s northwest of the Illinois River. High pressure will bring abundant sunshine and warmer condtions to central Illinois on Wednesday as afternoon highs rebound into the middle 60s.
Main upper trough is moving through the region this morning. A secondary trough will drop into the Northern Plains Wednesday and could bring us another quick shot of precipitation.
Scattered rain showers will persist across northeast Oklahoma and northwest Arkansas this morning in association with upper level trough axis. Otherwise, gusty north winds will continue behind cold front. /Issued 245 AM CDT Tue May 4 2021/ Scattered showers and storms will hang around for much of the morning hours today as the main upper level low tracks eastward over the area. Some of the valleys of northwest Arkansas and usually cooler places, the possibility for a light frost can't be ruled out as temperatures drop into the mid to upper 30s.
548 AM CDT Tue May 4 2021 An overcast day is in store across central Illinois as low pressure tracking through the Ohio River Valley brings showers to much of the area. 08z/3am surface analysis shows a cold front extending from eastern Michigan southwestward to Texas. While dry condtions are currently being observed, waves of low pressure riding along the slowly advancing front will spread showers back into the area later this morning. High temperatures will be suppressed in the upper 50s and lower 60s, with slightly warmer middle 60s south of I-70. Lows will range from the lower 40s northwest of the Illinois River. High pressure will bring abundant sunshine and warmer condtions to central Illinois on Wednesday as afternoon highs rebound into the middle 60s.
(Today and tonight) Expecting the storm activity to continue winding down along with the severe risk as the upper trough moves off to our east. Although we should see some sun this afternoon, temperatures should stay cooler than average for today, and gradually start warming by Wednesday.
On Wednesday, an upper level short wave trough moving from the northern Rockies into the Central High Plains by afternoon will help to drive a cold front southward across the Oklahoma Panhandle and the northern Texas Panhandle. The chances of rain will be conditional based off how much moisture this system can bring with it in the mid levels, because, the low level atmosphere will be very dry. The cold front will then make its way through the rest of the region Wednesday night. Highs today are expected to be in the 60's to the lower 70's.
Temps mainly in the 60s were noted behind the bndry in the rain-cooler airmass, with 70s still observed ovr SE AR. This feature wl interact with sfc bndry to bring another round of convection to mainly the SE half AR, where the warmer and more unstable conds wl exist. Other than some lingering small PoPs ovr Ern AR early this evening, drier and cooler weather wl finally return for the rest of the PD.
422 AM PDT Tue May 4 2021 High pressure near the West Coast will continue an inland warming trend through Wednesday with the marine layer keeping areas near the coast cooler with areas of night and morning coastal low clouds and fog.
/issued 619 AM CDT Tue May 4 2021/ Issuing update to allow the High Wind Warning to expire. Winds at Guadalupe Pass have weakened to below high wind criteria and are expected to remain below criteria so the High Wind Warning has been allowed to expire. /issued 334 AM CDT Tue May 4 2021/ A broad upper level trough is over the central part of the country with a cold front continuing to push through the area. Upper ridging begins to develop over the southwest part of the country on Wednesday with an upper trough over the central and eastern part of the country.
225 AM PDT Tue May 4 2021 High pressure shifting from the west coast to the Great Basin will bring warming temperatures through Wednesday.
A few of these thunderstorms may produce small hail due to low freezing levels and CAPE values ranging between 300 to 500 j/kg.
A cold front will then approach the area from the northwest around sundown.
Aside from this, current obs show temperatures hovering in the upper 30s to low 40s, thanks to light northerly winds advecting cooler air over the region. Given that relative humidity values will fall into the low to mid 20s east of I-29, expect fire danger to be slightly elevated, so proceed with caution if you must burn. Similar to the previous forecast, will continue to highlight those areas with the highest PoPs.
723 AM EDT Tue May 4 2021 Aviation - Upper troughing this week brings cool weather with occasional showers - Upper troughing this week brings cool weather with occasional showers Cold front moves east this morning with showers ending but low clouds remaining much of the day.
549 AM MDT Tue May 4 2021 The main upper trough moves east today along with an area of high pressure at the surface. A duo of short wave troughs moves into the region this evening and on Wednesday afternoon in the northwest flow aloft.
629 AM CDT Tue May 4 2021 (Today and tonight) Expecting the storm activity to continue winding down along with the severe risk as the upper trough moves off to our east. Although we should see some sun this afternoon, temperatures should stay cooler than average for today, and gradually start warming by Wednesday.
619 AM CDT Tue May 4 2021 Issuing update to allow the High Wind Warning to expire. Winds at Guadalupe Pass have weakened to below high wind criteria and are expected to remain below criteria so the High Wind Warning has been allowed to expire. /issued 334 AM CDT Tue May 4 2021/ A broad upper level trough is over the central part of the country with a cold front continuing to push through the area. Upper ridging begins to develop over the southwest part of the country on Wednesday with an upper trough over the central and eastern part of the country.
624 AM CDT Tue May 4 2021 The cold front has moved through all of the area terminals and winds have shifted to the north and northwest. An upper level trough is moving into West Texas and bringing a cold front through South Central Texas. The cold front has entered our northern area where winds have shifted to the north. This may change as the upper trough axis moves across the region later today. Cooler air will move in with high temperatures this afternoon 10 to 15 degrees cooler than yesterday. Low temperatures Wednesday morning will be near 10 degrees cooler than today. Wednesday will be pleasant with mostly sunny skies and warm temperatures just a couple of degrees warmer than today.
1033 AM EDT Tue May 4 2021 The 12Z KKEY RAOB sampled rising heights throughout much of the profile, highlighting the deep layer of ridging entrenched across the Florida Keys.
612 AM CDT Tue May 4 2021 (Today and tonight) Early this morning, a cold front has pushed southward into the Texas Hill Country. Cooler and drier air is slowly filtering in behind it as high pressure starts to move in from the Panhandle. Temperatures at 850mb will range from 8-10 deg C, which should only translate to high temperatures in the low to mid 70s this afternoon, despite clearing skies and abundant sunshine. By tonight, high pressure will settle in across much of the central and southern Plains, allowing the pressure gradient to relax and winds to become light from the east. Clear skies with a cooler airmass should result in low temperatures in the mid to upper 40s.
344 AM MDT Tue May 4 2021 Low pressure will track southeast across the area today with scattered showers. Upper ridging will build over the region for the middle of the week, allowing for dry and warm weather conditions.
Wet-Bulb zero and freezing level heights are marginal, but with Effective Bulk Shear over 40kts along with mid-level lapses rates around 7. Slightly below normal temperatures can be expected on Wednesday, with morning lows in the low to mid 50s and highs in the mid to upper 70s.
549 AM EDT Tue May 4 2021 Ongoing passage of a cold front will end all rain shower chances after 10Z, while post-frontal cold air advection will reinforce IFR/MVFR cig trends through the morning hours. Veering winds expected behind the cold front, with westerly flow turning northwesterly by the afternoon. There will be a chance for rain shower development around a 21Z-03Z window as a low pressure system moves in across the Ohio River Valley. Deep low pressure circulation, centered near MBS and Saginaw Bay at 12Z, will slowly lift across Lake Huron through this afternoon. The next wave of low pressure, convective remnants from OK/TX, will pass through the Ohio River Valley beginning late this afternoon.
A pair of fast-moving, shallow mid-level short wave troughs will pass over the northernmost portions of the forecast area in the next 24 hours.
Band of ample moisture remains positioned over the region as broad upper level trough continues to support the active environment.
Mid level trough axis this morning stretches from southern NM through the northern plains per water vapor imagery this morning. Very little to no elevated instability exists in our area for thunderstorms as the showers are expected to dissipate eastward through mid morning as the upper trough lifts east. Cooler airmass arrives behind the front today as h85 temps fall close to 0C towards north central KS. It's conceivable however for some patchy frost to form towards far eastern Kansas, especially in low lying areas where temps may be a few degrees cooler. A weak mid level wave quickly progresses through the plains Wednesday afternoon accompanied by a cold front progged to arrive overnight. Degree of forcing and overall moisture from consensus guidance is lacking so have kept the low chances for showers towards north central KS through early evening.
346 AM MDT Tue May 4 2021 The main upper trough moves east today along with an area of high pressure at the surface. A duo of short wave troughs moves into the region this evening and on Wednesday afternoon in the northwest flow aloft.
A vigorous short wave trough is starting to depart the region this morning.
/issued 302 AM EDT Tue May 4 2021/ An U/L disturbance over the Southern Plains will lift northeast across the Lower/Mid Mississippi Valley and Ohio river Valley today and tonight. An associated cold front will approach and stall across north Florida on Wednesday and Wednesday night. A strong U/L ridge will hold over the Bahamas and Florida peninsula. A next much stronger disturbance will approach the Pacific northwest mid to late week which will aid in inducing a high amplitude pattern to develop over the CONUS with sharp ridging over the Rockies and in response a digging deep trough over the eastern U.
A cold front will approach from the northwest today, passing through mid to late morning for MFE and into the early afternoon for HRL and BRO, bringing moderate to gusty northerly winds.
702 AM EDT Tue May 4 2021 A broad area of low pressure will drag a front across our region later today and tonight. Notably cooler air will follow this slow moving system late Wednesday through the end of the week with temperatures forecast to average nearly 10 degrees below normal. Weak low pressure will move east along an oscillating frontal boundary today. The highest chance for storms will come well south of Buffalo and Rochester where thin spots in the cloud cover could allow SBCAPEs to exceed 500 j/kg. This within a cool weather pattern could be conducive for frost formation across cooler spots in SW NYS.
655 AM CDT Tue May 4 2021 A mix bag of ceilings expected through the TAF period as cold front moves across the area. Wet-Bulb zero and freezing level heights are marginal, but with Effective Bulk Shear over 40kts along with mid-level lapses rates around 7. Slightly below normal temperatures can be expected on Wednesday, with morning lows in the low to mid 50s and highs in the mid to upper 70s.
Wayne, NE had fallen below 40F last hour under some of the starriest portion of the sky this morning as clouds have continued to build in from the southwest in response to the trof working through Kansas.
Showers and thunderstorms will remain possible until cold frontal passage Wednesday. Once this occurs, partial clearing and overall drying is anticipated as high pressure moves in behind the front.
Latest surface analysis show a cold front extending from near Interstate 64 in southwest Indiana to just south of Marion Illinois to near poplar Bluff Missouri. By late tonight, high pressure from the Central Plains will move over the middle Mississippi valley. Cooler air will continue to filter in, keeping our high temperatures 5 to 10 degrees below normal, and lows 4 to 7 degrees below normal.
Cloud cover will quickly decrease tonight into Wednesday morning as a ridge of high pressure amplifies across the western US. As skies clear, freezing to below freezing temperatures are possible across western Montana valley locations.
449 AM MDT Tue May 4 2021 Water vapor shows trof axis just to our east, with west/northwest flow aloft extending westward through the Pac NW where the next upper wave resides early this morning. At the surface, ridge covers the western Dakotas, with generally light winds and mostly clear skies. Showers/isolated storms will become fairly numerous this evening and overnight as the upper wave and associated cold front cross the area, with precip waining from west to east towards morning.
The primary threats are from wind gusts and large hail that may form with mesocyclone supported cells. Showers and thunderstorms will remain possible until cold frontal passage Wednesday. Once this occurs, partial clearing and overall drying is anticipated as high pressure moves in behind the front.
/issued 655 AM CDT Tue May 4 2021/ A mix bag of ceilings expected through the TAF period as cold front moves across the area.
621 AM CDT Tue May 4 2021 At 07Z, GOES water vapor imagery showed a trough axis from about KINL-KRAP shifting slowly southeast. Some thin instability is present in the cloud layer and the weak trough is shifting through for added lift - but with the depth being less than 1Kft and a dry layer below 5-6kft bases, it doesnt seem measurable rain will be seen. Tonight the ridge axis now over ND will shift into the area with clear skies and cold air.
High pressure will build into the region for the mid to late week period driving warming trend temperatures and dry conditions.
Rain will come to an end from west to east with cooler air filtering into the area. High temperatures today will only climb into the lower 60s to upper 50s for some areas. Late this evening and overnight, clouds will shift east of the region as the 700mb trough moves east of the area. High pressure will move over the area during the day wednesday allowing for ample sunshine.
Dew points were in the low to mid 70s resulting in MLCAPE over 2000J/kg. A cold front has moved through Jonesboro, AR and Kennett, MO and will continue to move across the remainder of the Midsouth this evening and overnight.
357 PM CDT Tue May 4 2021 Generally cooler than average temperatures, along with mostly dry conditions, continue to be the main focus for the forecast period. There is a signal for stronger westerly winds, but also more widespread rain showers as a mid-level impulse makes its way into the region on the backside of the upper low.
Even so, not expecting much more than a couple tenths of QPF in the highest elevations. Clearing skies and quiet northwest flow remains as the ridge of high pressure moves over the Intermountain West Wednesday night. Warming temperatures in the short term remain near normals (except in the lower southwestern 1/2 of forecast area, where things look closer to 5-10 degrees above normal).
Temperatures will drop tonight with the cooler air mass in place, with lows dropping into the upper 40s and lower 50s. Mostly sunny and warmer on Wednesday with highs from the mid 70s east to lower 80s west.
The cold front should be pushing out of the area around 00Z, but a few elevated storms could linger into the evening mainly over west Kentucky. Latest surface analysis show a cold front extending from near Interstate 64 in southwest Indiana to just south of Marion Illinois to near poplar Bluff Missouri. By late tonight, high pressure from the Central Plains will move over the middle Mississippi valley. Cooler air will continue to filter in, keeping our high temperatures 5 to 10 degrees below normal, and lows 4 to 7 degrees below normal.
1119 AM EDT Tue May 4 2021 Marine - Upper troughing this week brings cool weather with occasional showers - Upper troughing this week brings cool weather with occasional showers Cold front moves east this morning with showers ending but low clouds remaining much of the day.
445 PM EDT Tue May 4 2021 Shower and thunderstorm activity will end with passage of a cold front on Wednesday. Showers and thunderstorms will remain possible until cold frontal passage Wednesday. Once this occurs, partial clearing and overall drying is anticipated as high pressure moves in behind the front.
A ridge of high pressure will begin building over the region late today and overnight leading to warmer conditions on Wednesday.
Chattanooga Airport, TN 80 62 73 49 72 / 90 80 20 0 0 Knoxville McGhee Tyson Airport, TN 80 61 71 47 67 / 80 60 40 0 10 Oak Ridge, TN 78 59 70 46 67 / 80 60 40 0 10 Tri Cities Airport, TN 80 60 70 43 65 / 70 60 60 0 10.
With warmer air advecting in, afternoon highs will trend up today and Wednesday.
Meanwhile, the Gulf of Mexico and the Western Caribbean remain entrenched in deep- layer ridging. Lower heights will make slow headway into the northern Gulf of Mexico tonight through Wednesday night, nudging the mean-layer ridging to the southeast.
354 PM CDT Tue May 4 2021 Broad cyclonic flow is evident through much of North America on 20Z water vapor imagery as this morning's upper trough axis pushes east. High pressure is dominant over the Northern and Central Plains at the surface, with a northerly breeze keeping temps on the cool side, although clearing skies have at least allowed us to get to the low/mid 60s. High clouds look to begin to move into north central KS around sunrise ahead of the next disturbance, which may help keep temperatures a few degrees warmer for those areas.
/Tonight through Tuesday/ Breezy and seasonably cool conditions have been experienced today as the region now resides on the backside of a low pressure system that delivered scattered rain yesterday. Focus for shower activity shifts to a surface warm front late into Wednesday night which models currently place near the IA/MN border and drop southeast through eastern Iowa.
This pattern holds through tonight into Wednesday before a cold front stalls north of the region through Wednesday night.
Storms are expected to continue as a cold front moves into an unstable and moist air mass. The cold front extends from just inland of the central Texas coast into the mid Mississippi and Ohio Valleys. High pressure behind the front lays across the plains into Canada. A cooler and drier air mass will filter in. CAA will limit highs Wednesday into the low 80s to upper 70s.
inverted trough extends across Lake Huron and along the eastern shore of Lake Superior.
1226 PM CDT Tue May 4 2021 An overcast day is in store across central Illinois as low pressure tracking through the Ohio River Valley brings showers to much of the area. Precip chances will end late this evening as the main H5 trough finally passes overhead. 08z/3am surface analysis shows a cold front extending from eastern Michigan southwestward to Texas. While dry condtions are currently being observed, waves of low pressure riding along the slowly advancing front will spread showers back into the area later this morning. High temperatures will be suppressed in the upper 50s and lower 60s, with slightly warmer middle 60s south of I-70. Lows will range from the lower 40s northwest of the Illinois River. High pressure will bring abundant sunshine and warmer condtions to central Illinois on Wednesday as afternoon highs rebound into the middle 60s.
Another high pressure builds in Wednesday night and skies should clear around midnight.
133 PM EDT Tue May 4 2021 Aviation - Upper troughing this week brings cool weather with occasional showers - Upper troughing this week brings cool weather with occasional showers Cold front moves east this morning with showers ending but low clouds remaining much of the day.
However, we still expect a cold front to push east and produce another round of strong to severe thunderstorm activity between 4 PM and roughly 10 PM. Additional shower development is possible ahead of the approaching cold front, but these are not expected to bloom into thunderstorms, much less strong to severe convection.
108 PM EDT Tue May 4 2021 A trof of low pressure crosses the area tonight. A cold front crosses the area late Wednesday.
A backdoor cold front passage will increase northerly winds near the lake and immediately downwind late tonight into tomorrow morning. High pressure building over the lake will quickly lighten these briefly stronger northerly winds, with an early lake breeze push thanks to close to full sun early Wednesday afternoon. Highs near the lake will only be in the lower to mid 50s. Toward the end of the week, the jet stream will slip south of our forecast area implying cooler temperatures as reflected by an average 850 mb temperature near or even below freezing. This trend of the jet stream remaining for the most part south of us will keep our temperatures slightly below normal for the next few days, with highs in the lower 60s to as low as the mid 50s, and lows in the lower 40s and upper 30s.
1113 AM CDT Tue May 4 2021 Large hail and damaging winds are the main severe weather threat today and winds are mostly veered ahead of the cold front. /issued 655 AM CDT Tue May 4 2021/ A mix bag of ceilings expected through the TAF period as cold front moves across the area.
A cold front is moving through the area bringing with it a line of showers and thunderstorms and a northerly wind shift. Fowler A cold front over Central Texas will race east this morning and reach the College Station area around 15z. It will be warmer over the eastern zones ahead of the front, so there will be a bit more instability with CAPE values around 2200 J/Kg, LI values around -9, PW values reach 1. There will be quite a contrast in temperatures today from the cooler air behind the front over the NW zones to the warm and humid air over the E-SE zones. MinT values will be cooler than the past couple of nights as high pressure settles over the southern plains and drier air works into the region.
The high instability and strong deep shear environment ahead of the line will promote high damaging wind potential as it moves through.
The low cloud deck that brought MVFR ceilings this morning will quickly lift and clear early this afternoon. /issued 619 AM CDT Tue May 4 2021/ Issuing update to allow the High Wind Warning to expire. Winds at Guadalupe Pass have weakened to below high wind criteria and are expected to remain below criteria so the High Wind Warning has been allowed to expire. /issued 334 AM CDT Tue May 4 2021/ A broad upper level trough is over the central part of the country with a cold front continuing to push through the area. Upper ridging begins to develop over the southwest part of the country on Wednesday with an upper trough over the central and eastern part of the country.
Shower chances will be better across northern NE overnight as the lower levels moisten slightly, but across southwest NE it remains quite dry where only a slight chance for pops will exist.