Aikyam-Lab/Synoptic-Bench huggingface dataset:
407 PM EDT Tue May 4 2021 A cold front will continue to move through the region into the evening hours.
Temperatures will fall in to the lower to mid 40s overnight.
Differential CAA continues tonight with flow backing southwest aloft as the governing upper low drifts east into northern Ontario. Associated trough axis slowly pivots through Lower Michigan overnight, but speeds remain rather weak IVOF the wave with only minor height falls.
141 PM 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.
409 PM EDT Tue May 4 2021 A trof of low pressure crosses the area tonight. A cold front crosses the area late Wednesday.
This rain will shift southeast of our forecast area by midnight as an upper level trough and associated surface wave along the cold front move east of the region. Highs will be warmer on Wednesday due to the ample sunshine.
158 PM CDT Tue May 4 2021 A boundary accompanying a long wave trough has been gradually moving through the region today. A small high pressure system behind the front brings a couple days of clear skies and calm conditions.
1252 PM 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.
1258 PM EDT Tue May 4 2021 An approaching upper trough will support another round of showers and thunderstorms this afternoon and evening before crossing the region overnight. A backdoor cold front will pass through the region on Wednesday night bringing cooler and drier weather for late this week and into the weekend. The highest rain chances appear to be south of I-20 where atmospheric moisture is higher. Highs will be in the low to mid 60s. Drier air will move into the forecast area Wednesday night as a backdoor cold front pushes through. A broad, upper level trough will amplify over the eastern US late this week.
255 PM EDT Tue May 4 2021 Low pressure will gradually move across Maine and New Hampshire later tonight and Wednesday bringing rain to our region.
Showers will continue to dissipate across the region throughout the morning hours and cloudy skies will make way for some sun as upper level ridging starts to build in from the west. Showers will end this morning with warmer temperatures today and Wednesday as high pressure moves over the area.
Temperatures will trend warmer with generally drier conditions Thu/Fri as upper level ridging builds into the region.
320 PM EDT Tue May 4 2021 A trof of low pressure crosses the area tonight. A cold front crosses the area late Wednesday.
High pressure will continue to build southward through the evening into the overnight hours and winds will begin to slacken.
This activity is associated with a low pressure system which is tracking southeast through the region. The low is forecast to exit the region by Wednesday afternoon.
1230 PM 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.
The cooler-than-average Canadian high pressure remains over the region tonight, causing low temperatures to again drop into the 30s. East of I-29 will see clearer skies around sunrise, but large temperature-dew point spreads may prevent moisture from accumulating and freezing on vegetation, even if temperatures are able to cool to near 32 degrees at the surface. A tenth to a quarter inch of precipitation is expected, with the highest totals north of I-90 from De Smet SD to Ivanhoe MN. The low center moving directly through the region will cause winds to vary in direction, but winds speeds remain relatively low given the modest surface pressure gradient.
Diegan Chattanooga Airport, TN 62 73 49 72 47 / 80 10 0 0 0 Knoxville McGhee Tyson Airport, TN 61 71 47 67 46 / 60 20 0 10 10 Oak Ridge, TN 59 70 46 67 45 / 60 20 0 10 10 Tri Cities Airport, TN 60 70 43 65 42 / 60 40 0 10 10.
The current surface analysis shows the cold front that passed through the area this morning, just south of the CWA. Tonight, the cooler drier air will be better felt with overnight lows in the low 50s in the Hill Country, and low 60s elsewhere. Tomorrow, the area is dominated by surface ridging and will remain dry and pleasant with highs in the 70s and 80s.
148 PM CDT Tue May 4 2021 Upper trough that brought cooler wx to the region moving off to the east with weak ridge building in from the west.
Trailing upper trough finally moves east late tonight and that will bring us a dry Wed.
1108 AM EDT Tue May 4 2021 A cold front in tandem with a mid-level disturbance will produce periods of showers and thunderstorms today into tonight. High pressure will provide cooler, drier conditions mid-week before another mid- level disturbance brings a return of precipitation late in the week. On Wednesday, clouds begin to decrease from northwest to southeast as high pressure builds in, leading to a breezy, cool day. A weak ridge of high pressure will move into the area for Wednesday night. Lows will fall into the upper 30s to the lower 40s.
140 PM PDT Tue May 4 2021 High pressure will continue to build into SoCal through Wednesday, resulting in a warming trend.
406 PM EDT Tue May 4 2021 An upper short wave will be moving from the lower MS Valley through the OH Valley tonight and Wednesday morning. The surface cold front should move into north GA Wednesday around 12z and push into central GA during the day.
High pressure aloft will continue over the area through Wednesday. A broad area of low pressure will approach the West Coast for the second half of the week and bring cooler temperatures and a slower clearing marine layer. High pressure aloft will dominate through Wednesday with most areas slightly warmer than today. The ridge will begin to shift east Wednesday night as a trough approaches the Pac NW.
300 PM CDT Tue May 4 2021 The upper-level trough that brought thunderstorms to the area yesterday and clouds today has moved into Oklahoma this afternoon. Upper- level ridging will begin to build into the area tonight, helping to bring a mostly sunny day for the day tomorrow. The passing wave will bring a glancing shot of mid-upper level moisture and lift, while also sending a cold front southward through the region.
Best shower potential is expected to shift to central and eastern zones on Wednesday, as high pressure builds over western zones, and pressure gradient tightens in the east.
At the surface, the area has seen a slow moving, elongated ridge of high pressure, under mainly sunny skies. The slow movement of this ridge has kept the region mainly light/variable for winds, but over the last hour or so, NE Colorado and adjacent KS/NE counties are now seeing a southerly fetch, signifying the back edge of the exiting ridge. Temperatures are ranging from the mid 50s in spots up to the lower 60s.
1258 PM EDT Tue May 4 2021 Shower and thunderstorm activity will end with passage of a cold front on Wednesday. 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.
It doesn't look like a big precipitation maker but a transient period of low pops were maintained as a brief period of large-scale forcing for ascent sweeps over the area ahead of the subtle mid/upper trough.
/issued 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.
Added some pockets of isolated thunder to our northern Utah / southwest Wyoming showers this afternoon (confined to the higher terrain). High pressure will build into the region for the mid to late week period driving warming trend temperatures and dry conditions.
404 PM EDT Tue May 4 2021 WV imagery and RAP analysis indicated a mid/upper level low over northeast Manitoba and northwest Ontario with broad trough extending through the central CONUS. At the surface, a trough extended into northeast Lake Superior from low pressure near the southern end of Georgian Bay. Tonight, expect some clearing into the west half of Upper Michigan as high pressure and drier air builds toward the area. High pressure building over the area will bring more sunshine even as the cool weather remains. 850 mb temps in the -1C to -3C range will only support max temps in the low to mid 50s south while onshore keeps readings in the 40s over the north.
1206 PM 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.
A cold front has progressed through most of the region through the morning and early afternoon today bringing with it showers and isolated strong thunderstorms. Precipitation chance will come to an end by the evening as high pressure quickly builds in behind the exiting front.
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.
150 PM EDT Tue May 4 2021 Low pressure is slowly departing the region to the east this afternoon with modest cold advection continuing to work in through the rest of the day. Low pressure and frontal forcing moving through the Ohio Valley will offer a couple of opportunities for light rain, mainly for the Metro Detroit sites. 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.
222 PM EDT Tue May 4 2021 A cold front in tandem with a mid-level disturbance will produce periods of showers and thunderstorms today into tonight. High pressure will provide cooler, drier conditions mid-week before another mid- level disturbance brings a return of precipitation late in the week. On Wednesday, clouds begin to decrease from northwest to southeast as high pressure builds in, leading to a breezy, cool day. A weak ridge of high pressure will move into the area for Wednesday night. Lows will fall into the upper 30s to the lower 40s.
1230 PM 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.
An upper disturbance within a northwest flow will support isolated to scattered showers over the higher elevations.
The cold front finally moves east tonight and into the tomorrow with decrease PoPs. Most area should be dry tomorrow with much cooler temperatures with highs in the 60s to low 70s.
337 PM CDT Tue May 4 2021 Starting to get a few healthy showers going along the cold front over the Pennyrile from Providence toward Calhoun. More widespread showers and possibly a few brief storms are expected to spread east across the region as the upper trough moves through this evening.
The remaining showers will exit the eastern counties early this evening with clearing skies from west to east as high pressure builds into the region. Look for overnight lows from the upper 30s to the lower 40s.
Surface ridging conditions along with clear skies will result in a rather chilly night, with widespread 40s expected.
This will change some late this afternoon and evening as the upper level trough and associated LL trough kicks east with some moisture pooling ahead of the trough. Expect cooler conds, esp west.
252 PM MDT Tue May 4 2021 Primarily showers developing over the mountains, foothills and Cheyenne Ridge this afternoon. On Wednesday, a little drier and a little warmer. For Wednesday night the upper trough has pushed east with a ridge building over the Great Basin.
937 AM PDT Tue May 4 2021 High pressure will continue to build into SoCal today and Wednesday, resulting in a warming trend.
Current surface analysis reveals a cold front nearly on top of the Ohio River at this hour. This clearing has allowed the atmosphere to begin destabilizing again, prepping us for a final round of storms just ahead of a cold front. Showers and isolated storms will begin to fire along the cold front within the next hour or so, but will really take off late this afternoon and evening when the cap erodes. The tornado threat isn't non-zero, but it should be greatly limited due to hodographs generally showing storms ingesting crosswise vorticity (vs streamwise) in the lowest levels. Over time, expect activity to begin merging into clusters or form a line along or near the cold front as it pushes eastward. Temperatures will be on the cool side for early May, with highs topping out in the low to mid 60s.
Going lows in the lower-mid 40s still look good. This rain will shift southeast of our forecast area by midnight as an upper level trough and associated surface wave along the cold front move east of the region. Highs will be warmer on Wednesday due to the ample sunshine.
620 PM CDT Tue May 4 2021 Area will see decreasing clouds in the wake of today's cold front that is just about to move off the coast. A cold front has progressed through most of the region through the morning and early afternoon today bringing with it showers and isolated strong thunderstorms. Precipitation chance will come to an end by the evening as high pressure quickly builds in behind the exiting front.
706 PM CDT Tue May 4 2021 (This evening through Wednesday) Cool, below-average temperatures are expected for tonight and in the wake of the cyclone that brought us severe weather last night. By tomorrow afternoon, winds will veer to the south, which will result in a warmer day with highs in the 70s deg F.
614 PM CDT Tue May 4 2021 A cold front is pushing SE through central sections of the state.
1021 PM EDT Tue May 4 2021 A trof of low pressure crosses the area tonight. A cold front crosses the area late Wednesday.
816 PM EDT Tue May 4 2021 Low pressure will gradually move across Maine and New Hampshire tonight and Wednesday bringing rain to our region.
249 PM PDT Tue May 4 2021 High pressure shifting from the West Coast to the Great Basin will bring warming temperatures through Wednesday.
629 PM CDT Tue May 4 2021 TAF sites are currently a mix of VFR/MVFR ceilings, as the low- pressure pulls through the region. High pressure will continue to build southward through the evening into the overnight hours and winds will begin to slacken.
High pressure will continue over the area through Wednesday. A broad area of low pressure will approach the West Coast for the second half of the week, bringing cooler temperatures and a slower clearing marine layer. High pressure aloft will dominate through Wednesday with most areas slightly warmer than today. The ridge will begin to shift east Wednesday night as a trough approaches the Pac NW.
1049 PM EDT Tue May 4 2021 A weak frontal boundary will remain nearby into Wednesday morning, with a series of weak waves of low pressure tracking along it. A cold front will then move across Wednesday afternoon.
621 PM CDT Tue May 4 2021 A boundary accompanying a long wave trough has been gradually moving through the region today. A small high pressure system behind the front brings a couple days of clear skies and calm conditions.
746 PM EDT Tue May 4 2021 A trof of low pressure crosses the area tonight. A cold front crosses the area late Wednesday.
624 PM EDT Tue May 4 2021 A trof of low pressure crosses the area tonight. A cold front crosses the area late Wednesday.
1001 PM EDT Tue May 4 2021 A cold front will continue to move through to Southeast Ohio tonight. An upper level disturbance is forecast to travel up the cold front late tonight.
/issued 300 PM CDT Tue May 4 2021/ The upper-level trough that brought thunderstorms to the area yesterday and clouds today has moved into Oklahoma this afternoon. Upper- level ridging will begin to build into the area tonight, helping to bring a mostly sunny day for the day tomorrow. The passing wave will bring a glancing shot of mid-upper level moisture and lift, while also sending a cold front southward through the region.
(This evening through Wednesday) Cool, below-average temperatures are expected for tonight and in the wake of the cyclone that brought us severe weather last night. By tomorrow afternoon, winds will veer to the south, which will result in a warmer day with highs in the 70s deg F.
A cold front is on its way out of the southeastern forecast area this afternoon, with northerly winds/cold advection ongoing across the area. Nonetheless, more rain showers can be expected through the evening and into the overnight as a midlevel frontogenetic zone and broad upper level trough axis pivots through the region, accompanied by a strengthening 110-130KT upper level jet streak. The high will traverse the area Wednesday night, but some mid and high cloud will begin to move into the area late as another surface boundary and broad upper level troughing approach from the northwest. Did make downward adjustments to lows Wednesday night with the high moving overhead. Despite the mid and high cloud moving in late, dewpoints down into the low to mid 30s across much of the area should allow temps to drop a bit lower than NBM depicts.
This line is enhanced by a jet streak lifting northeast across the lower Ohio valley. Chattanooga Airport, TN 62 74 50 73 49 / 80 10 0 0 10 Knoxville McGhee Tyson Airport, TN 61 71 47 68 47 / 60 30 0 10 20 Oak Ridge, TN 59 70 46 69 46 / 50 20 0 10 20 Tri Cities Airport, TN 59 69 42 65 43 / 40 40 0 10 30.
Otherwise, the surface front and main upper level trof axis will be moving across the forecast area this evening. These ceilings will lift by mid to late morning as deeper northerly flow brings in drier air to mix out the low level moisture. 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.
Trailing upper trough finally moves east late tonight and that will bring us a dry Wed. Chances for showers and thunderstorms and an approaching cold front will bring MVFR/IFR cigs and vis tonight as well as northwesterly/northerly winds by sunrise. Scattered showers and thunderstorms will impact terminals this evening, with the cold front moving through overnight additional chances for showers and storms will bring cigs down to MVFR and IFR, and even LIFR at KCSV by 12Z.
Moderate NW wind continues through Wednesday to reinforce cooler air over the region which maintains the supply of clouds into the afternoon, although early May daytime heating provides a chance to lift ceiling into VFR. Differential CAA continues tonight with flow backing southwest aloft as the governing upper low drifts east into northern Ontario. Associated trough axis slowly pivots through Lower Michigan overnight, but speeds remain rather weak IVOF the wave with only minor height falls.
1039 PM EDT Tue May 4 2021 Broad area of low pressure will drag a cold front across the region tonight, which will support unsettled weather through at least the first half of Wednesday. Noticeably cooler air will filter in behind the slow moving system late Wednesday and remain in place through the end of this week with temperatures progged to average close to 10 degrees below normal. With the cooler temperatures across the area, along with the preceding conditions, frost may form across the cooler spots in southwestern New York.
505 PM EDT Tue May 4 2021 Low pressure will gradually move across Maine and New Hampshire tonight and Wednesday bringing rain to our region.
Upper level ridging across the region will make for dry Wednesday across Western Washington.
903 PM CDT Tue May 4 2021 A cold front continues to push through the Mid-South this evening. Made some minor adjustments to POPS as wrap around showers behind the cold front are occurring across Northeast Arkansas. 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.
515 PM EDT Tue May 4 2021 Broad area of low pressure will drag a cold front across the region tonight, which will support unsettled weather through at least the first half of Wednesday. Noticeably cooler air will filter in behind the slow moving system late Wednesday and remain in place through the end of this week with temperatures progged to average close to 10 degrees below normal. With the cooler temperatures across the area, along with the preceding conditions, frost may form across the cooler spots in southwestern New York.
1048 PM EDT Tue May 4 2021 High pressure located near Bermuda is slowly retreating eastward. A ridge axis extends westward across the south central Florida Peninsula and into the eastern Gulf of Mexico. The low level inversion and associated dry air is a little bit stronger than in previous nights. Meanwhile, it's another mild night with current temperatures in the lower 80s. Given the sounding and the trend over the last few nights, the low level inversion and dry air will stop any chances for precipitation across the island chain tonight. Beyond tonight, rain chances will remain below normal through the next few days as deep layer ridging and scant moisture hold firm across the area.
907 PM EDT Tue May 4 2021 Low pressure will pass just to the north of the region tonight. A second low pressure will pass north of the area on Wednesday, dragging a cold front across the area.
/issued 148 PM CDT Tue May 4 2021/ Upper trough that brought cooler wx to the region moving off to the east with weak ridge building in from the west.