Aikyam-Lab/Synoptic-Bench huggingface dataset:
625 AM EDT Tue Sep 26 2017 High pressure over the eastern Great Lakes will weaken today and tonight. This will allow a cold front to move through the area Wednesday spreading a cooler, more seasonable air mass across the area. The strong upper ridge over the region will weaken tonight into Wednesday as will the associated surface system. This will allow a cold front across the nations midsection to move east across the region Wednesday.
311 AM CDT Tue Sep 26 2017 A cold front is located this early morning from Lake Michigan down to northwest Texas. Meanwhile, an elongated upper level ridge is noted from the Western Gulf of Mexico up into the forecast area. With a little bit more of ridging aloft, nocturnal shower activity has been less than the past couple of nights, with just a few small showers right off the immediate lower Acadiana coast. The best chance and coverage will be over Lower Acadiana as that area will be located further away from the elongated ridge aloft.
331 AM EDT Tue Sep 26 2017 Warm, humid weather continues today and Wednesday, though it will be cooler for areas closer to the coast. A cold front will move into the area Wednesday night, bringing an end to this warm and humid air mass, replacing it with a cooler and drier one. This cooler, drier weather will last through the weekend. With fog this morning and high clouds crossing the region today, have forecasted slightly cooler readings than yesterday. Otherwise, a large ridge of high pressure will continue to dominate the region today. By Wednesday afternoon, the long awaited cold front will be approaching the region. There may be a shower along the Midcoast as well as moisture converges along a prefrontal trough. Cold front crosses the area Wednesday night with a chance of showers or a thunderstorm as it does so.
354 AM MDT Tue Sep 26 2017 A short wave ridge aloft will be over the region today with one trough exiting into the the upper Midwest while another drops into the Great Basin.
The cold front across our region was slowly moving eastward, however will still be straddled across the area late this afternoon and evening, to be the focus for continued rounds of shower and thunderstorms as the strong 850 mb moisture transport over the panhandles impinges on the boundary. Given the high theta-e/moisture content air and low level forcing, some locations of localized flooding could occur especially in the southeast counties, enhancing the already 3 to 4 inches across Pratt and Barber counties. However the models relegate any dense fog well to the west over the higher terrain in Colorado overnight.
/Today through Tonight/ At the surface the cold front will be over far eastern Iowa at 12Z and continue to move towards the Great Lakes through the day. To the west, high pressure will build into the region. Aloft, the upper low and associated trough will swing northeast. Cooler and drier air move in for tonight and for the first time in awhile we will see temperatures tonight at or slightly below normal with lows from the mid 40's to the mid 50's.
Little has changed regarding the synoptic setup versus yesterday with the base of the deep trough remaining over the southwest CONUS with southwest flow aloft in place across South-Central Texas. The highest PoPs will remain across the western CWA in the best region of this low-level lift and any responses from perturbations within the southwest flow. High temperatures will be in the 80s to near 90 degrees with a low tonight in the lower 70s across much of the area.
Overnight water vapor and RAP analysis showed very slow-moving upper level trough axis still centered across the Rockies. Western Kansas was under the influence of increasing surface pressure and much cooler, drier air (drier in a relative sense compared to what we have seen). Another upper level low will be developing across the Four Corners region, although it will be fairly weak, with the southwest flow ahead of this low overlaid a very statically stable airmass over the High Plains.
Upper air analysis this morning shows a short wave mid level ridge over the western Gulf, poking northward into the Mid-South. East of the ridge, high level trof has slipped southeast and is more positioned over the northeast Gulf. Considering where the better moisture axis is, passage of weak mid level impulses that ease southward between the upper ridge to the west and trof to the southeast aiding in ascent, forecasters call for isolated to scattered showers and storms generally along and south of a line from Waynesboro MS to Milton FL today.
1210 AM CDT Tue Sep 26 2017 A few showers are around the region in response to upper level low pressure system over the immediate area. Winds are northerly above 500 mb from being under the western side of an upper low. /issued 409 PM CDT Mon Sep 25 2017/ Weak upper low is over the forecast area and is triggering a few showers and thunderstorms over the area. This upper low will weaken and rain chances will come down tomorrow and lower to a dry forecast on Wednesday.
/DL/ Today and tonight: The mid/upper low which has inflated rain chances across the area over the past several days is now finally withdrawing toward the eastern Gulf of Mexico.
While highs will run 10-15 degrees warmer than yesterday, highs will still be on the cool side with temperatures aloft mild at low-levels when compared with the SPC Sounding Climo. Highs forecast in the lower to mid 60s. An upper level low will slowly lift northeast from the desert southwest into our area by the end of the week.
Subjective 00Z upper-air analysis indicates upper low centered in southeast MT, with downstream ridge centered over MA/RI/CT, and with a 120kt upper-level jet streak downstream of the trough from western NE/western SD through central SD/eastern ND. An 850mb low was centered in northern ON, with a secondary low in NM, and with a cold front extending between the lows through MN/central NE/western KS/OK-TX panhandles.
407 AM CDT Tue Sep 26 2017 An upper level trough over the northern Plains will move eastward into the northern portion of the Great Lakes region tonight, and send a cold front currently extending from northwestern WI southwest into central OK southeastward through our forecast area today and this evening. Unseasonably warm temperatures are expected again today, especially across east central and southeast MO and southwest IL ahead of the cold front. Cooler temperatures, closer to seasonal normals can be expected across parts of northeast MO today, and northeast and central MO and west central IL tonight. Otherwise, much cooler temperatures will be the main story.
314 AM CDT Tue Sep 26 2017 Water Vapor imagery this morning showing longwave troughing extending from eastern MT through the 4-corners area in the southwest US. Expecting a few thunderstorms to result across central WI while the showers will be diminishing at least west of the Mississippi River behind the cold front. Look for skies to gradually clear from west to east overnight as high pressure builds in from the Plains. High pressure slides across the area Wednesday night with mostly clear skies and cool temperatures. Look for lows in the lower to middle 40s.
139 AM EDT Tue Sep 26 2017 High pressure remains in control through midweek. Cold front to bring cooler temperatures but limited precipitation Thurday. High pressure dominates the weather the start the week. Temperatures will remain well above normal for this time of year to start the period as the responsible upper-level ridge erodes with an approaching trough from the West.
The potential for heavy rainfall and Flash Flooding will Looking for showers and thunderstorms to develop areawide today and tonight as lift from a large upper level trough and cold front interact with a moist and unstable airmass across west Texas and southeast New Mexico.
Aloft, flow remains southwesterly, with satellite imagery showing the main upper low spinning over WY. The southward extending trough axis will continue to gradually swing through the Plains, and though the main axis of precipitation is shifting just of to our east-southeast, at least scattered additional development will remain possible across the CWA through tomorrow morning. At the surface, the main front continues pushing south, as high pressure settles in from the north. By the time Wednesday morning rolls around, a closed low has developed over the CA/AZ/NV border area.
SHORT TERM (Now through Wednesday): Deep South Texas will remain between a large-scale trough/500mb low over the western half of the U. and a 500mb ridge over the western Gulf of Mexico through the period. Brownsville radar currently shows the heaviest activity across Zapata county with a few streamer showers moving northwest across the lower Texas coastal waters. The best rain chances will be across Zapata, Starr and Jim Hogg counties due to higher QPF and close proximity to the 500mb trough. Abundant cloud cover and increase rain chances should hold high temperatures down into the low to mid 90s for today and Wednesday.
Away from the coast max temps will be similar to yesterdays - maybe a degree or two cooler in vlys. The coasts will be cooler due to weaker offshore flow and an earlier sea breeze.
With light winds temperatures will reach the lower 90s inland.
Rain is likely again on Tuesday with the highest chances at KCDS. /issued 319 PM CDT Mon Sep 25 2017/ The initial closed low currently near the Wyoming/Montana border will flee to Canada tonight. However, another closed low will develop near Las Vegas, NV tomorrow. As the low cuts off on Tuesday, a weak Rex block will develop which will continue to pump moisture into the area. This will occur as additional jet level energy will be diving down on the upwind side of the long wave trough. These stronger jet level winds will emerge on the downwind side of the trough axis on Tuesday. A cold front will slowly move through the region on Tuesday which will be the main player in precipitation chances over the next 24 hours or so.
121 AM EDT Tue Sep 26 2017 High pressure over the eastern Great Lakes will weaken and shift off the east coast by Wednesday. A cold front from the upper midwest will cross the area on Wednesday and a cooler, more seasonable air mass will spread across the area. The strong upper ridge remains anchored over the area, squeezed between Maria off the coast and the approaching short wave over the northern plains. Well above normal temps continue with lows from the upper 50s into the mid 60s and highs again around 90 except slightly cooler within a mile or so of Lake Erie where there will be a lake breeze again on Tuesday. Upper level ridge finally weakens allowing surface cold front to move into the Central Great Lakes by daybreak Wednesday.
Temperatures early this morning range from the lower 30s to mid 40s. Some locations are already at freezing and with a few more hours before sunrise so will keep current Frost Advisory and Freeze Warning running until 9 AM CDT. High pressure will continue to build into the region today which will help to slowly clear out skies. Temperatures will be pretty similar to yesterday with highs in the low to mid 50s. With temperatures reaching at or below freezing, another Frost Advisory and Freeze Warning will be issued.
1020 AM EDT Wed Mar 21 2018 A cold front has advanced south of the Keys this morning, and will be south of our Atlantic waters in a short while. or slightly drop a degree or two as cooler and drier air advects in.
Tonight, high pressure shifts east and WAA will get underway.
Scattered to numerous snow showers will continue through the afternoon and evening as we will continue to have steep low level lapse rates and near saturation in the dendritic growth zone underneath a closed upper low. In higher elevations, upslope NW flow and sub-freezing temps will allow for additional accumulation, mainly in the 1 to 3 inch range.
1024 AM EDT Wed Mar 21 2018 Snow should begin to taper off later today as low pressure exits. Dry weather is then expected under high pressure through the rest of the work week. Snow rates will gradually lessen this morning and afternoon as the upper low transitions east and support wanes. Snow is expected to continue through part of the day as low pressure crosses the OH Valley and Mid Atlantic regions.
1029 AM EDT Wed Mar 21 2018 Low pressure is moving slowly east today allowing light snow to linger for a few more hours.
Farther south toward Fargo and into MN Lakes country snow lighter and less impactful due to slightly warmer temps. Upper level ridge builds over the Rockies today and tonight. Light precip was occuring in the low level instability.
1253 PM EDT Wed Mar 21 2018 Strong upper trough will bring cooler and windy conditions today behind a cold front.
Very dry high pressure overhead will maintain clear skies and VFR. high pressure is swinging in behind the front and settling into the central United States and the northwest gulf region.
A cold front will approach today bringing increasing rain and gusty winds for tonight through Thursday morning.
730 AM EDT Wed Mar 21 2018 Strengthening low pressure east of the Delmarva Peninsula will track northeast and away from Pennsylvania tonight. A ridge of high pressure will build into the region from the Great Lakes late in the week. Low pressure moving out of the Mississippi Valley will likely pass well south of Pennsylvania over the weekend. Mid level closed low over the Ohio Valley will shift eastward across Virginia today, placing southern Pa in favored region of best deformation/frontogenetic forcing and anomalous easterly flow. Expect a similar situation to play out today, with the high March sun angles helping to melt snow on pavement. NBM/Superblend indicating max temps Thursday ranging from the low 30s over the highest terrain of the Alleghenies, to the low 40s in the Susq Valley.
Moist southwest flow aloft will develop today, and a cold front will move inland early Thursday.
After the coolest morning in the wake of the earlier cold front, a warming trend begins today. Northwesterly flow aloft gradually turns zonal by late Thursday as mid and upper level ridging approaches.
Otherwise, VFR conditions will prevail with high pressure moving in during the next 24 hours.
Temperatures are in the low to middle 40s with low to middle 50s expected this afternoon. Frost and freezing temperatures are expected again tonight with the coldest readings near the Tennessee River in West Tennessee. Temperatures early this morning range from the lower 30s to mid 40s. Some locations are already at freezing and with a few more hours before sunrise so will keep current Frost Advisory and Freeze Warning running until 9 AM CDT. High pressure will continue to build into the region today which will help to slowly clear out skies. Temperatures will be pretty similar to yesterday with highs in the low to mid 50s. With temperatures reaching at or below freezing, another Frost Advisory and Freeze Warning will be issued.
Snow will move out of the area later this morning and then expect dry conditions as high pressure quickly moves through.
High pressure aloft will continue to bring warmer temperatures with readings peaking Thursday in the mid 80s to around 90 degrees.
Both features will shift east today in deference to a longer-wavelength ridge which will amplify over the Rockies. Highs will range from the lower to mid 50s at locations that will experience more sun to upper 40s in west-central IA.
Water vapor and IR imagery show a flat upper level ridge building over the Central Rockies. With the ridging aloft and weak surface gradient, winds will be lighter today. Medium range forecast models show a gradual progression from upper ridging over Colorado to southwesterly flow aloft and then an upper low over the southwestern U.
1043 AM EDT Wed Mar 21 2018 Coastal low pressure will move northeast to a position off of Cape Cod early Thursday. High pressure will build in from the west through the end of the work week and first half of the weekend.
The axis of the high will be closer to the local area by tonight.
Very quiet weather expected the next couple of days with high pressure dominating the region.
/issued 329 AM CDT Wed Mar 21 2018/ (Today and Tonight) High pressure across the region will leave quiet weather in place for today and tonight. Temperatures will be a bit warmer than yesterday in the mid to upper 70s with sunny skies. Then for tonight, low temperatures should drop into the lower 50s.
and Thursday Quiet weather is expected to continue, with Hudson Bay high pressure remaining over the region. A weak upper trof will edge east across the region today, with little impact other than clearing skies as it departs.
Upper level ridge builds over the Rockies today and tonight. Light precip was occuring in the low level instability.
Pretty much the entire column has some northerly component which makes since given the recent cold front passage and broad trough dominating the eastern CONUS. The freezing level did drop from around 11k to 7.
726 AM EDT Wed Mar 21 2018 WV imagery and RAP analysis indicated a weak mid/upper level nrn stream trough from Manitoba into the Upper MS valley and a downstream ridge through nw Ontario. At the surface, high pressure centered near James Bay dominated the region with dry ene low level flow. This will allow temps to drop toward the lower end of guidance with min readings in the low single digits west to the lower/mid teens along the Great Lakes. Quiet weather is expected to continue into the weekend under persistent high pressure. Building 5h heights and confluent flow ahead of an advancing mid- upper ridge from the west will yield more sunshine Thu and Fri as temps push back toward normal with highs in the lower to mid 30s north to lower 40s south.
617 AM CDT Wed Mar 21 2018 Rather tranquil weather with a warming trend the next couple of days as an upper ridge builds over the Rockies and across the high Plains with increasing southerly low level flow for central/eastern Kansas. The going forecast/temperatures are on track, trending from the low to mid 60s today into the lower 70s on Thursday.
901 AM MDT Wed Mar 21 2018 Quiet weather in store today as upper ridge builds over the region. Building ridge in advance of deepening low off the Pacific coast will bring a warming trend through Thursday. Impressive WAA at 700 MB by Thursday w/ 700mb temps above freezing and 850mb temps greater than +10C. Nights will fall below freezing in the eastern valleys with the possible exception of Thursday night w/ thermal low and cloud cover in place.
1000 AM EDT Wed Mar 21 2018 Deep low pressure off the Northeast seaboard will keep a dry NW low level flow across the area through this afternoon. Breezy to windy northwest winds and cooler temperatures are expected with highs in the lower to mid 70s.
Highs today should generally be in the 30s, with highs on Thursday in the lower to middle 40s. There should be a bit more sunshine on Thursday, as high pressure will be in place across the western Lake Superior region.
Low pressure system will slowly slide east of the region today. High pressure will begin to build into the area late afternoon into the evening and winds will begin to relax quite a bit. Overnight the high will slide into western Tennessee and we will see almost calm winds area wide. Areas across the north will drop to or just below freezing, so a Freeze Warning has been issued. A highly amplified pattern sets up through the end of the week with troughing along the East Coast and Ridging sliding through the center CONUS.
The upper trough will move out of the southeast U. If there is accumulation it should be limited to grassy areas, and mainly in the higher elevations and generally a dusting to a half inch at the most. Lows tonight will drop to or just below freezing across extreme north Georgia tonight.
1202 PM EDT Wed Mar 21 2018 Snow should begin to taper off later today as low pressure exits. Dry weather is then expected under high pressure through the rest of the work week. Snow rates will gradually lessen this morning and afternoon as the upper low transitions east and support wanes. Snow is expected to continue through part of the day as low pressure crosses the OH Valley and Mid Atlantic regions.
An upper low off the B. coast will track southward and several embedded waves rotating around the low will enhance the precipitation east of the Cascades. An associated surface cold front will bring breezy to windy conditions Thursday afternoon. A fast moving cold front will move across eastern WA and OR Thursday afternoon.
Today Through Thursday Night 07z subjective surface analysis indicates a pressure ridge extending from southeast Nebraska, to central Texas. The ridge axis will be east of the forecast area by late in this period.
We have slowly warmed some in the low-level thermal profiles. Other than a few passing low-mid level clouds across the Golden Triangle region from the departing & weakening front and mid-upper trough, expect a nice and mostly clear day elsewhere. A good frost is expected over eastern portions as minimums fall into the low to mid 30s.
1037 AM EDT Wed Mar 21 2018 A breezy mostly sunny and clear day is on tap across the region as high pressure builds in. A few spots across southwest Florida may just get into the low 70s late this afternoon.
615 AM CDT Wed Mar 21 2018 In between systems today as upper closed low spinning on satellite over the Ohio Valley and closed low off Vancouver, with upper ridge between the two. Numerous waves moving down the backside of the low to the east along the eastern borders of the Dakotas. Mostly clear skies today and light west to southwest flow pushing a warm front across the area. Ridge will continue to build east and north tonight with warmer air aloft.
523 AM MDT Wed Mar 21 2018 Latest upper analysis depicts an upper ridge building over the western CONUS. At the surface, light southwesterly winds will become southeasterly this afternoon as a high pressure center strengthens over the central plains. With the ridge building to the west, dry and warmer weather is expected today with highs mainly in the mid 40s to mid 50s. Cooler temperatures will occur over northwestern South Dakota where the coverage of the snow pack is most extensive. On Thursday synoptic scale subsidence associated with the upper ridge building over the forecast area will lead to dry weather and warmer temperatures. As the upper ridge shifts eastward on Thursday night as series of disturbances in the southwesterly flow aloft will bring a good chance of precipitation to much of the area.
A trough off the West Coast will help to increase temperatures and moisture aloft through Thursday. The main warm front will move into the region early Thursday morning, with precipitation becoming widespread across much of the region. After a break in precipitation, a cold front will move through the region late Thursday afternoon, with a chance of thunderstorms along the front. Showers are expanding in coverage to the south and west of the CWA this morning, associated with a warm front that will move northeast through the area today. These showers will enter the area this morning, and additional showers will develop behind the warm front this afternoon and evening. Therefore, significant snows will be confined to the highest peaks. On Thursday, a cold front will move toward the region from the west, and convection will once again develop in the warm sector.
849 AM EDT Wed Mar 21 2018 Snow should begin to taper off later today as low pressure exits. Dry weather is then expected under high pressure through the rest of the work week. Snow rates will gradually lessen this morning and afternoon as the upper low transitions east and support wanes. Snow is expected to continue through part of the day as low pressure crosses the OH Valley and Mid Atlantic regions.
With the strong low pressure system off the mid-Atlantic coast, the pressure gradient in far eastern IL is still strong enough to produce wind gusts of 20-25 mph. As the low tracks further away, skies will gradually clear from north to south across the area this morning. High pressure will begin to shift east of the region on Thursday, allowing a weak impulse to approach from the northwest.