Aikyam-Lab/Synoptic-Bench huggingface dataset:
1142 PM MDT Tue May 11 2021 The low pressure system responsible for the wintry weather across southeast WY was centered south of Rawlins, moving slowly to the east. The precipitation will persist through the late afternoon and early evening with the passage of the low, then taper off from west to east later. Northwest flow aloft in the wake of the departing upper level low and trough will remain active Wednesday with the passage of a short wave disturbance during the afternoon.
400 AM CDT Wed May 12 2021 A broad upper level trough sits over eastern Montana early this morning, with downstream ridging from western Ontario through Minnesota. Pockets of energy rotating around the base of the trough have produced some light showers over Montana. As the trough slowly makes its way eastward, scattered showers and isolated thunderstorms are expected to increase in coverage across western North Dakota this afternoon, with forcing possibly aided by a weak low level convergence zone.
However, left the remainder of the watch intact due to indications from some of the high res models and current radar imagery that showers and thunderstorms may redevelop late this evening mainly along and south of I-20.
Light cool, moist northeast winds will continue to keep the lower atmosphere pretty much saturated, and temperatures will consequently struggle into the lower 50s this afternoon. Winds will trend light and variable through Wednesday morning with the surface anticyclone nearby, so if any breaks in the stratus can materialize, will need to monitor for low/mid 30s on the higher terrain of the NW zones. Elevated south winds and much warmer temperatures finally return Thursday, with gusts near 30 mph and highs in the upper 60s and lower 70s.
Cloudy skies should persist through the day, keeping high temperatures in the low to mid 60s across the area.
Our stretch of cooler than normal weather will soon come to an end, as temperatures will gradually moderate into the mid and upper 60s for most areas by the latter portion of the week.
High pressure builds north of the region into tonight. as low pressure tracks across the southeast states. High pressure settles over the local area Thursday. Weak sfc boundary-trough aloft currently sliding SSE over srn/SE portions of the FA. Upper level trough to settle over the region Fri which may result in spotty pcpn and VRB clouds.
Dry weather will continue today with high pressure in place across the Midwest.
357 AM CDT Wed May 12 2021 This morning have an upper ridge over the West Coast with a trough across MT and WY.
226 AM MDT Wed May 12 2021 Broad northwest flow continues across the state today, as high pressure builds across the West Coast. The remainder of central and southwestern WY will see a return of warmer temperatures, with highs reaching around 60. Increased westerly surface winds will again bring warmer temperatures to the rest of the state, with widespread 70s for the lower elevations and higher elevations in the 40s and 50s.
Night through morning low clouds will continue through the week for coast and valleys but will likely be less extensive through Thursday as high pressure aloft develops and onshore flow weakens. Temperatures inland will climb to slightly above normal through Thursday then near to slightly below normal over the weekend as low pressure moves in and deepens the marine layer. Models continue to advertise one additional day of decreasing marine layer depth due to high pressure aloft and this should provide for one more day of warming inland but probably not much change closer to the coast where ocean temps are still in the upper 50s to around 60. The ridge will start to weaken and move east Thursday as the next trough arrives in the Pac NW.
Surface analysis early this morning shows high pressure in place over Wisconsin and the Great Lakes. Dew points were in the lower 30s. a strong ridge was found. Models today continue to suggest the progression of the ridge to the northwest sagging southward across Central Indiana. Surface dewpoint suggested in the lower to middle 30s along with ideal radiational cooling set-up continues to suggest frost potential. More dry weather along with slightly warmer temperatures look in play on Thursday. with slightly warmer temps as the air mass across the region modifies under plentiful sunshine.
Low pressure system should begin moving offshore at some point this evening, and high pressure will then build in over the area.
Our stretch of cooler than normal weather will soon come to an end, as temperatures will gradually moderate into the mid and upper 60s for most areas by the latter portion of the week. Expansive high pressure centered over the Upper Great lakes will promote fair weather Wednesday and Wednesday night.
1139 PM CDT Tue May 11 2021 Clearing skies and diminishing winds will lead to a cold and frosty night across central Illinois as low temperatures dip into the lower to middle 30s. High pressure anchored over the Upper Midwest/Great Lakes continues to provide a cool/dry northeasterly flow across central Illinois. allowing lows to dip into the lower to middle 30s. After a cold/frosty morning, abundant sunshine will boost highs on Wednesday into the lower 60s.
Left 20 POPS across the area this morning, but by this afternoon clearing will begin to take place as high pressure begins to build into the Ohio Valley.
As always cooler by the lake. Relative humidities will be in the upper teens to the lower 20s Wednesday leading to near critical fire weather conditions for Minnesota where slightly higher winds at 5-10 mph are expected. The Northland will continue to be dry with a slight increase in relative humidity due to the return flow on the back side of the high pressure. As we move into Thursday evening, we will see an increase in moisture due to the aforementioned return flow on the back side of the high pressure along with moisture from the Pacific northwest.
Lows tonight range from the low to mid 60s inland to upper 60s along the coast. Lows Wednesday night will be cooler, in the mid and upper 50s inland to low 60s along the coast.
Warming mid-level temps and height rises on Thursday will result in a warmer afternoon, with highs topping out 5 to 10 degrees above average.
930 PM PDT Tue May 11 2021 Building high pressure aloft will bring warmer days and a shallower marine layer Wednesday and Thursday to inland areas.
NW gradient flow will preclude frost formation, and advective cold will produce min temperatures in the lower 30s over the Laurel Highlands and parts of the NW Mountains. High pressure will provide fair and dry wx on Wednesday.
Aloft, a lingering trough axis will shift slowly off to the east of the area by mid afternoon leading to steadily increasing heights across the area. The overhead trough will lead to an increase in afternoon cloud cover today, but the coverage will be greatly reduced from the past few days. The high pressure system being centered overhead tonight, along with clear skies and calm winds, will lead to yet another chance for frost, especially across central and north-central WI. The upper ridge sliding overhead tonight into Thursday, will allow high temperatures to warm above normal. Overnight lows are expected to be in the low to mid 30s central and north-central, while the rest of the area will see lows in the upper 30s to around 40.
The temperature forecast appears to be on track at this time, with lows expected to reach the lower 50s for all areas. However, low level moisture will be lacking and there will be limited isentropic ascent this far north given that the low level frontal zone will lie well south along and south of the Gulf Coast.
Lows tonight will be in the lower to mid 50s. By Wednesday afternoon, rain chances will start to wind down and by Thursday a high pressure will take control bringing pleasant conditions to the Mid-South by Thursday.
343 AM CDT Wed May 12 2021 It is a cool and moist start to this mid-May day as the southwest flank of broad surface ridging centered over the Upper Midwest and western Great Lakes continues to hold sway locally. yesterday) expect warmer temperatures today, but still well below average. We are forecasting highs in the lower to middle 60s, but it could be several degrees warmer if/where the sunshine exceeds expectations. Thursday's highs will take a small step in the direction toward more seasonal temperatures as ridging across southwest CONUS shifts east for the end of the week and the weekend. Expect highs in the low 70s with modest H50 increases while surface winds veer to the southwwest in the afternoon.
256 AM EDT Wed May 12 2021 Weak low pressure slowly moves off through the Maritimes.
Only change to the forecast for tonight was warming up the lows near Cave Junction. /Issued 252 PM PDT Tue May 11 2021/ Warm and dry conditions will remain in place across the area through Thursday with a strong upper level ridge in place. A surface thermal trough will remain near the coast and result in gusty north winds across the coastal waters and along the coast. Highs are forecast in the mid 80s to near 90 for inland valleys west of the Cascades and in the lower to mid 80s for valleys east of the Cascades. At the coast, cooler and near normal temperatures are expected except for locations across the southern Curry County coast were offshore northeast winds will result in a Chetco warming effect.
Precip should depart the area tonight with sfc ridging finally settling south which should provide dry weather through the rest of the period. Accompanying the northeast winds provided by sfc ridging centered north of the state will be steep NW flow aloft, aiding in below average temperatures through Thursday. Morning lows Thursday could fall into the upper 30s across portions of northern and western Arkansas when sfc ridging is most influential.
Everywhere else was basically clear as high pressure was in control.
334 AM EDT Wed May 12 2021 High pressure continues to build over the region today. High temperatures are once again below normal with temperatures in the low to mid 60s. A weak mid level trough will move across the Tennessee Valley Thursday night -- with any pcpn staying southeast of ILN/s area.
These winds will mix down to the surface by mid to late morning Thursday after the low level inversion breaks.
Despite northeast to east winds, the clear skies will allow temperatures to warm up a bit higher than yesterday, into the low to mid 60s.
Temperatures are hovering between 80 and 82 degrees, with humid dewpoints in the lower to mid 70s, and winds on land are from the southeast near 10 mph. Surface analysis depicts high pressure over the western Atlantic, with a stalled frontal boundary lying across the Southeastern states to the Texas coast. Aloft, a flat lower to mid level ridge extends from the western Atlantic through the Florida Straits and Cuba to the Yucatan Peninsula, with generally zonal flow over the eastern CONUS.
Slightly warmer lows tonight, in the upper 30s to lower 40s, will bring an end to the frost/freeze concerns. The aforementioned high pressure starts to slip southeast of the area on Thursday, with southerly low-level flow increasing.
Southerly low level return flow will develop on Thursday in the wake of the departing ridge with modest northwesterly flow aloft.
1145 PM CDT Tue May 11 2021 A trough is positioned over the Northeast with a wave over Texas/Oklahoma and a ridge over the middle of the CONUS or north of the southern wave. Highlights: 1) Cool continues Wednesday 2) Precipitation chances thru mid day Wednesday 3) Warmer at the end of week Change: Precipitation chances The cooler air sticks around for another day on Wednesday with high temperatures once more around 60 degrees. Scattered showers remain possible into mid day Wednesday with minimal if any accumulation given the low chances. Warmer air is expected to move in for Thursday to help nudge temperatures up a notch closer to 70 degrees.
1028 PM MDT Tue May 11 2021 19z surface analysis had weak high over the upper Midwest with weak trough from central MT into central WY. Water vapour had weak mean trough from central AB into CO. Wouldn't be surprised to see some small hail with the strongest cells as well as peppy SHSN over the highest elevations. Wednesday, mean upper trough shifts slowly eastward in response to upper ridge building into the western CONUS. Modestly gusty southerly winds expected ahead of the trough.
A weak cold front remains down along the coast and that is more where the main storm track will be through today. These showers will move out pretty early this morning and behind this upper wave, a closed upper low will drop into the OH valley late tonight, then take until the end of the week to move off the east coast. To start the weekend, ML/UL trough remains over the eastern US and then on Sun, a weak upper ridge will build over the region. Through the weekend, rain will continue to remain minimal as this building ridge and a Bermuda high keep the storm track north and west of the region. The ECM is significantly drier as it holds the upper ridge/Bermuda high over the region into late week.
1252 AM CDT Wed May 12 2021 247 PM CDT High pressure ridges in over the next few days, keeping us dry and mostly sunny other than fair weather cumulus. High pressure will be stationed nearly on top of us overnight, leading to very light to calm winds. Continued sunny skies will allow high temperatures to climb a bit higher into the lower to mid 60s on Wednesday, except for near the lake, which will remain in the mid 50s. Nevertheless clear skies will allow several locations to radiate into the 30s again Wednesday overnight, especially locations that tend to be cooler.
308 AM CDT Wed May 12 2021 Dry weather is anticipated for the remainder of the work week as high pressure prevails at the surface and a west-northwest flow aloft develops.
As the cold front continues to push southward Wednesday night into Thursday we can expect shower and thunderstorm activity to begin winding down as we transition into N-NE flow overnight.
Upper level ridging will strengthen across the western United States during the short term period with a trough to the east of the forecast area. Warmer temperatures finally return starting Thursday with southerly winds near 30 mph in the afternoon.
High temperatures once again today will be below normal for early May with readings in the lower 60s. Tonight another wave will move southeast in the northwesterly flow aloft, however with the low level jet focused across western Kansas into Nebraska any elevated showers will focus across north central Nebraska. Lows tonight will cool into the lower 40s.
Temps somewhat mild now but will fall steadily to the low 50s thru the day as the front pushes south, reaching our southern most counties by sunset. Often will make warm side of boundary warmer than guidance but with front moving south so quickly during the day, little opportunity to improve.
Canadian high pressure currently over Wisconsin will slowly meander southward over the next 24 hours. Temperatures today should be similar to yesterday, with highs generally climbing into the low to mid 60s.
High temperatures however will likely remain in the lower 60s. We have gone on the cooler side of temperature guidance which now has middle to upper 30s across the eastern portions of the area for Thursday morning.
336 AM CDT Wed May 12 2021 Summary: High pressure still has command over much of the region but is slowly moving to the southeast. High pressure continues to be the main weather feature over the region today giving us highs in the mid to upper 60s. We are expecting drier conditions today as well with min RH's dropping below 20 percent for northern MN and into the lower 20s for NW WI. The pleasant weather should continue into Thursday as the high slowly descends to the southeast. However, given the strong dry air in the lower levels confidence is not high that any clouds bearing moisture would have enough to produce measurable rainfall.
346 AM CDT Wed May 12 2021 (Issued 340 AM CDT Wed May 12 2021) Today through Thursday: Looking pretty quiet across southern WI for the next few days as high pressure meanders over the Western Great Lakes. Will likely see diurnal clouds develop this afternoon, but temps will be warmer today as well as on Thursday as highs rise into the 60s again. This will cool things behind the boundary and tend to keep things cooler by the lake. Overnight temps will be warmer as well with lows in the upper 30s to low 40s.
The low-levels are expected to remain saturated within the lowest 200 millibars to support the formation of light drizzle tonight, and with relative humidity already in the 90-100 percent range, areas of fog will persist through at least sunrise tomorrow as well. The low stratus deck will begin to lift late tomorrow morning and into the early afternoon hours as near-surface vertical mixing begins to increase as winds veer to the east and weaken. Weak upper ridging will move overhead on Thursday leading to a dry day. Southerly and relatively moist southerly flow will likely lead to thunderstorms off of the higher terrain of eastern New Mexico.
/22/ Prior discussion below: Tonight and tomorrow: Early afternoon water vapor imagery continues to depict a trough axis sliding out of the Rockies and into the Central Plains. Further east, over the Lower Mississippi Valley, predominately zonal flow aloft remains in place with a stalled cold frontal boundary draped across northern portions of the CWA. Locally heavy rain will also be possible with the highest totals expected over southern portions of the area where low- level ThetaE air and instability will be maximized.
201 AM EDT Wed May 12 2021 High pressure ridging in from the north and moisture riding over a frontal boundary stalled to the south will produce wedge conditions across the region tonight into Thursday.
1141 PM EDT Tue May 11 2021 Strong high pressure in place across the central United States will be the primary influence on our weather through the workweek. A weak disturbance will pass across the northern portions of the forecast area through Wednesday morning, and a couple weak systems will approach the area this weekend as the High slowly weakens and shifts offshore. An outflow boundary,separate from the trough (oriented more E-W vs the more N-S trough), has been sliding south the last couple of hours, mainly across NJ. In the mid levels, the base of a positively tilted mid level short wave trough remains over our region. Given the position of the High a dry NW flow will prevail Wed/Thu, with temperatures slowly moderating through the period but still remaining 5-10 degrees below normal (i.
909 PM PDT Tue May 11 2021 Only change to the forecast for tonight was warming up the lows near Cave Junction. /Issued 252 PM PDT Tue May 11 2021/ Warm and dry conditions will remain in place across the area through Thursday with a strong upper level ridge in place. A surface thermal trough will remain near the coast and result in gusty north winds across the coastal waters and along the coast. Highs are forecast in the mid 80s to near 90 for inland valleys west of the Cascades and in the lower to mid 80s for valleys east of the Cascades. At the coast, cooler and near normal temperatures are expected except for locations across the southern Curry County coast were offshore northeast winds will result in a Chetco warming effect.
Surface ridging builds into the southern Appalachians and Tennessee valley tonight. Surface ridging will continue to build into the region with unseasonably chilly temperatures.
Another warm and muggy start to our day as high pressure remains in control over the Sunshine State. Ridging over the area will give in to an approaching frontal boundary that will begin to slowly move south on Thursday.
Warm and dry conditions will remain in place across the area through Thursday with a strong upper level ridge in place. A surface thermal trough will remain near the coast and result in gusty north winds across the coastal waters and along the coast. Highs are forecast in the mid 80s to near 90 for inland valleys west of the Cascades and in the lower to mid 80s for valleys east of the Cascades. At the coast, cooler and near normal temperatures are expected except for locations across the southern Curry County coast were offshore northeast winds will result in a Chetco warming effect.
This will bring cooler 850mb temperatures and a mix of clearing and clouds at times.
628 AM EDT Wed May 12 2021 High pressure ridging in from the north and moisture riding over a frontal boundary stalled to the south will produce wedge conditions across the region today into Thursday.
A cold front is slowly working through the Rio Grande Valley with showers and a slight chance of thunderstorms expected into this afternoon. /issued 417 AM CDT Wed May 12 2021/ SHORT TERM (Today through Thursday): Storms ahead of a cold front this morning brought much welcome rain to Deep South Texas, but damaging winds and large hail as well. Expect rainfall to taper off from the west to east, potentially remaining pesky across the valley as the cold front hangs up to the south.
Night through morning low clouds will continue through the week for coast and valleys but will likely be less extensive through Thursday as high pressure aloft develops and onshore flow weakens. Temperatures inland will climb to slightly above normal through Thursday then near to slightly below normal over the weekend as low pressure moves in and deepens the marine layer. Onshore grads are little stronger this morning but the higher hgts aloft have smooshed the marine layer some. Max temps will generally be a few degrees warmer today due to the higher hgts. The ridge breaks down on Thu and Fri and onshore flow increases.
824 AM CDT Wed May 12 2021 Have cancelled the Frost Advisory a bit early as the strong May sunshine has allowed temperatures to quickly rise above freezing at all of the observation sites within the Advisory area.
1047 AM EDT Wed May 12 2021 A large area of high pressure will drift south from the Upper Mississippi River Valley bringing dry weather conditions through most or all of the upcoming weekend. All the lower clouds have gone away as we've mixed well this morning. A weak mid/upper level thermal trough will drift south across the region this morning, bringing some areas of stratocu clouds and no (measurable) precipitation outside of a few sprinkles. Otherwise, high pressure will provide mostly sunny skies and just a light to moderate NW breeze with peak gusts AOB 20 mph in most places.
1015 AM EDT Wed May 12 2021 Low level ridging remains intact and stretches west across Florida. High pressure over the western Atlantic will retreat further offshore today through Thursday, as a weak trough eases southward across Florida.
The Lower Mississippi Valley remains situated beneath predominately zonal flow aloft as a weak trough axis gradually shifts into the Great Plains. At the surface, a cold frontal boundary has finally cleared the area and is located along the Gulf Coast. To the N, drier air & high pressure over the Great Lakes will slowly sag to the S. With widespread cloudiness & quite a bit cooling in the low- levels, highs will only top out in the mid 60s N to mid 70s S, which is about 10-15 degrees below normal. Tonight: As the synoptic trough axis digs down through the mid-upper MS Valley, high pressure/subsidence & drier air will build in from the N. Lows will fall below normal, into the upper 40s in the cooler areas of the Golden Triangle while low-mid 50s elsewhere.