Aikyam-Lab/Synoptic-Bench huggingface dataset:
247 PM PDT WED MAY 25 2016 An upper level low over Southern California will move into Arizona tonight with westerly winds increasing across the mountains and deserts behind it.
Breezy to windy conditions will continue through this evening as a low pressure system approaches from the west.
With low freezing levels in place there have already been reports of small hail from the stronger cells, and this will be common over the next few hours, though instability is too low/shallow to produce severe weather. Upper low which has been in southern Saskatchewan for several days is beginning to sag southward. Upper low will shift slowly east to western ND tomorrow afternoon and evening, and the persistent cyclonic flow aloft will result in more diurnal showers and isold tstms again on Thursday. Greatest chances will be in our west as cooler air on back side of low will provide some stabilizing for our east.
South of the Umpqua Divide in Jackson, Curry, Western Siskiyou, and Josephine Counties, sunshine abounds away from the strong marine layer influence, with clouds mainly over the higher terrain. Sunnier skies will exist south of the Umpqua Divide and also east of the Cascades where stability will be increasing and the low levels will be drying. Clearing skies and a cool air mass suggest near-freezing temperatures in portions of the Klamath Basin. Ensemble MOS guidance show temperatures in the low to mid 30s for Klamath Falls, and observations have generally been verifying on the low end of the guidance lately, so we have issued a Freeze Watch at NPWMFR.
SHORT TERM (Tonight through Thursday Night): A strong 500-mb closed low will be continue moving east into SoCal tonight and will move into the Four Corners area by midday Thurs. Upper-level ridging which was in place over the area for past several days has already begun flattening in response to this. With plentiful moisture in place, this should lead to a round of mainly scattered thundershowers over the western zones, possibly in combination with storms moving off the higher terrain in Mexico. associated with base of the main upper low/trough.
306 PM EDT WED MAY 25 2016 High pressure over the area will continue to weaken as a weak cold front approaches from the north. The front will move back to the north of the area on Thursday as high pressure tries to build back into the area from the east into the weekend. Low temps will be a lot warmer than this morning as dewpoints continue to rise.
The upper trough will continue to be slowly fill as it shifts farther SE away from the area tonight. This will allow a decrease in instability and moisture as an upper ridge edges closer to the Pacific coast.
| Predawn water vapor loop depicted a positively-tilted upper trough from south central Canada across the northern Rockies to a low off the central California coast. A quasi-stationary surface front extended from eastern South Dakota into western Nebraska then south through the high plains.
322 PM CDT WED MAY 25 2016 An area of low pressure was located in southeast North Dakota this afternoon with a frontal boundary extending east southeast through Minnesota into southern Wisconsin. The Northland was in a cooler easterly flow north of the boundary with stronger winds occurring around Lake Superior. On Thursday, the warm front will move east and north and extend from northeast North Dakota southeast into northwest Wisconsin Thursday afternoon then it will continue to push northeast. Highs Thursday will range from the lower seventies to lower eighties, but be cooler around Lake Superior as we expect the easterly flow to continue.
A ridge of high pressure centered off the east coast will be the dominant weather feature into the weekend. Beneath this ridge. We will also be watching an area of low pressure just off shore.
Rodriguez/Monteleone 335 AM CDT Upper ridging to our immediate southeast is expected to try to push back into the area Thursday while an overall warm and moist air mass continues to reinforce itself in deep southwesterly flow.
1150 PM EST Thu Mar 2 2017 Inbound arctic cold front to sweep across the region during the early morning period. Next window for snow showers centered 08z-10z with a cold frontal passage. Outside of snow showers, intervals of clear sky across the lowest 5000 ft will exist through the morning period. Even slightly colder Tomorrow as one more cold front tracks through Southeast Michigan Tonight, with 850 MB temps starting out between -18 C to -19 C Friday Morning.
A high pressure center will slowly move across the region keeping the winds off to the South. However, as this high pressure system moves off to the East, a low pressure system will slowly move toward the region.
301 AM EST Fri Mar 3 2017 Areas of snow showers will continue today before building high pressure returns dry weather for the weekend. The snow total forecast for these areas and the ridges does meet advisory criteria given localized nature of the squalls, which are being handled via Special Weather Statements.
Warm front developing from central MT into eastern CO. Water vapour had upper ridge building over the Rockies into the northern plains with AC/CI shield spilling over CWA on well-defined warm air advection regime.
343 AM CST Fri Mar 3 2017 Mid/high level clouds are streaming eastward across the area early this morning with temperatures ranging from the lower 40s at some well inland spots to the mid to upper 50s at the beaches.
1259 AM EST Fri Mar 3 2017 Aviation A cold front will bring light snow showers tonight with light accumulations of around an inch or less.
422 AM EST Fri Mar 3 2017 The region will remain under cyclonic flow from departing low pressure area over the Canadian maritimes.
Warmer lows can be expected tonight due to rising upper level heights, continued low-mid level warm air advection, increasing southeasterly surface winds, and gradually rising surface dew points. GKS The weekend will feature a RIDGE aloft with a gusty S-SW flow at the surface.
1136 PM CST Thu Mar 2 2017 Afternoon relative humidities are in the low to mid 20s with winds in the 10-20mph range across the Red Flag area. Upper level ridge currently over the Pacific Northwest will build into the Plains states into the weekend.
A new cold front will be pushing south through the state through the morning hrs. Lows tonight will be from the lower 30s in the north, to the mid and upper 30s in the rest of the state. Highs on Friday will be from the lower 50s east, to the mid 60s west.
325 AM EST Fri Mar 3 2017 High pressure will build into the area behind the cold front promoting dry and cooler weather through the weekend. High pressure will continue building east this morning. Dry High pressure will continue building east into the region today. Near normal high temperatures are expected under mostly sunny skies, in the lower 60s north to upper 60s southeast.
06Z surface data indicates high pressure over the upper and middle Mississippi Valley with a frontal boundary from the Tennessee Valley into the southern Plains. Quiet and dry conditions will be seen through sunrise and during the daylight hours as high pressure moves into the Great Lakes. Snow will begin breaking out in the highway 20 corridor west of Dubuque and increase in areal coverage and move to the southeast.
Band of MVFR cigs behind the cold front is dropping south across the region early this morning. Strong high pressure to the northwest will build in behind this front bringing cooler and clearing conditions through Friday and into the weekend.
An upper ridge will follow this afternoon and evening with dry weather and warmer temperatures. Flow aloft turns to the southwest tonight as ridge moves to the east.
A cold and clear day lies ahead as high pressure ridging passes across southern WI.
933 PM MST Thu Mar 2 2017 Satellite showing upper level moisture pushing into CO with NW flow over the top of a ridge to the south. Increasing dry and warm airmass will help to bring temperatures back into the lower 60s for tomorrow. Northwesterly flow will decrease tonight before turning westerly Friday as an upper ridge pushes in from the west. The warming airmass will allow for warmer minimum temperatures tonight through winds will be lighter so some lower areas may see similar readings to last night. Winds will remain gusty over the high terrain and along the northern state border, with lighter winds elsewhere. A dry and warm weekend look to be in store across the northern half of the state as a trough develops along the west coast.
400 AM EST Fri Mar 3 2017 A dry cold front will sweep across central NC today. Chilly high pressure will build into the region in the wake of the front tonight and linger through the weekend. Vorticity associated with a speed max diving through the Midwest will move through the base of the longwave trough today, propelling a secondary cold front across the area around midday. A strong high pressure and cP airmass will be building in from the northwest tonight, with decoupling strongly favored over the western half of the CWA.
Meanwhile, upper-level troughing over the eastern CONUS moves offshore over the western Atlantic, with ridging then building into the eastern CONUS in its wake. Large- scale subsidence beneath this ridge will keep skies mostly clear through the near term, with afternoon highs on Friday expected to reach a pleasant upper 60's areawide.
104 AM EST Fri Mar 3 2017 High pressure will build into the area behind the cold front promoting dry and cooler weather through the weekend. High pressure will continue building east this morning. Dry High pressure will continue building east into the region today. Near normal high temperatures are expected under mostly sunny skies, in the lower 60s north to upper 60s southeast. Dry High pressure will be across the region Friday night. Minimum temperatures Friday night are expected to be at or below freezing across the northern and central Midlands, and in the mid 30s over the southern Midlands and CSRA.
1025 PM MST Thu Mar 2 2017 17Z water vapor imagery and RAP analysis indicated broad troughing across central and eastern portions of the country with ridge over west coast. At the sfc, high pressure was settling over the area. A few mid clouds may develop along H7 thermal ridge do to persistent WAA, but shallow moisture profiles and stable conditions would keep precip threat essentially zero. dry conditions will prevail as H5 ridge shifts to the east and nears the CWA. With deep westerly flow think leaning on the warmer/drier solutions are in order and pushed deterministic forecast towards that envelope of solutions.
349 AM EST Fri Mar 3 2017 A fast moving area of low pressure is moving through the region early this morning. High pressure returns for the weekend.
The snow total forecast for the ridges does meet advisory criteria as far as magnitude, but prolonged nature of the event should preclude a headline. Further quick accumulation is likely, even spreading into the upslope areas of the Ridges.
1108 PM CST Thu Mar 2 2017 Current GOES Water Vapor imagery showing a mid-level trough swinging southeast through southern WI. For tonight, high pressure builds across the region providing mostly clear skies. High pressure slides east of the region by Friday afternoon as a warm front pushes north out of the Plains. Increasing warm air advection/isentropic lift ahead of the warm front and approaching weak mid-level trough will produce a chance of light snow Friday night.
The brief snow showers and flurries across the north associated with the exiting cold front will end quickly today, followed by clearing skies as drier air moves in. There will a few more clouds north tonight in weak isentropic lift as warmer air begins moving back in.
332 AM CST Fri Mar 3 2017 Early this morning, a clipper system, with a reinforcing cold front, was moving across the area. No travel impacts are expected, but the highest elevations could see a brief light dusting. For the daytime, dry high pressure will be in control.
328 AM EST Fri Mar 3 2017 Areas of snow showers will continue today before building high pressure returns dry weather for the weekend. The snow total forecast for these areas and the ridges does meet advisory criteria given localized nature of the squalls, which are being handled via the short fuse Winter Weather Advisory and Special Weather Statements.
1139 PM CST Thu Mar 2 2017 Early afternoon objective surface analysis indicated ridge axis extending from eastern ND into western NEb, and this is expected to develop across the FA overnight.
A reinforcing cold front will sweep through early in the period.
347 AM CST Fri Mar 3 2017 There is an upper trough centered to the north of the Great Lakes region and another upper trough just south of California.
A large mid-upper tropospheric ridge will prevail through Thursday, and this will lead to continued above-average temperatures. A high pressure ridge will shift from northwest to southeast across the Central Plains tonight, and this will result in a prolonged period of light winds tonight. The drier airmass, very light winds, and clear skies should allow temperatures to dip down to the lower to mid 40s most locations (especially along/north of Arkansas River). On Thursday, the leeside trough will redevelop with a shift in the surface wind back to the south/southwest.
1254 PM CDT Wed Oct 26 2016 Forecast highlights the next 7-10 days: Showers/thunderstorms southeast Kansas this morning, warmer than normal temperatures through much of the period, with minimal precipitation chances.
SHORT TERM (Tonight through Thursday Night): 500mb ridge across northern Mexico into the southwest United States will continue to provide subsidence across the CWA tonight into Thursday. A 500mb inverted trough/low is expected to move into the Bay of Campeche and the southwest Gulf of Mexico Thursday into Thurs night.
High pressure near the mid Atlantic coast will tighten the surface pressure gradient overnight with a 6 MB gradient from JAX to MIA late. High pressure will shift offshore from the mid Atlantic with breezy to windy onshore flow continuing. Expect rough surf at the beaches and high temperatures in the lower 80s along the coast to mid 80s across the interior. Low levels remain dry in the H8-H5 layer though GFS indicates increasing cirrus into the late morning and afternoon ahead of an upper level trough across the Gulf of Mexico.
229 PM MDT Wed Oct 26 2016 An upper level ridge will continue to build over the Great Basin region through the period. Winds will remain light with some gusting up to 25 mph over the higher terrain in the afternoon and evening.
A potent low pressure system will track through the southern Great Lakes during the TAF period. Cold front swings through with winds veering from southeasterly early to west/northwesterly late.
The main upper trough is taking its time moving across Upper Michigan today. The back edge of the higher returns on radar is steadily tracking through southeast WI late this afternoon. This will keep temperatures on the cooler side once again with highs around 50.
Expect lows to bottom out in the lower 60s, possibly even some middle 60s across the Big Bend and south-central Georgia.
412 PM EDT Wed Oct 26 2016 A low pressure system pushing across across northern Ohio will bring showers and possibly a thunderstorm tonight into Thursday morning.
The cold front currently extending from northeast MO to southeast KS will progress east into the forecast area through late afternoon and evening. Warmer temperatures return to the region by the end of the work week as southerly winds develop in response to a deepening trough over the northern Plains and an upper level ridge builds over the region from the southwest. The next cold front now looks like it will stall and weaken over northern MO late in the weekend, so have decreased pops to below 15 percent.
Strong high pressure to the north with inverted trough over the waters has produced a moderate ne flow today with isolated light showers along the east coast. NAM12 model depicts the inverted trough best and shifts the feature inland and weakens it tonight. Lows tonight will be in the low to mid 60s with highs Thursday in the low/mid 80s.
1124 AM MDT Wed Oct 26 2016 Upper ridging will rebuild into the northern Plains today and Thursday. Weak southwest low level flow will temps that are near to slightly warmer than yesterday with highs reaching the mid 60s to mid 70s. More quiet weather expected Thursday as the upper ridge axis crosses the region.
Issued by National Weather Service Gray ME 545 PM EDT Wed Oct 26 2016 Low pressure will move slowly away from the region tonight with weak high pressure moving overnight and into tomorrow. Low pressure will move out of southern New England toward the area tomorrow night with precipitation developing from south to north.
Dry stable conditions under deep layered ridging will maintain pleasant dry weather across the entire forecast area tonight through Thursday. Temperatures tonight and Thursday will remain a few degrees above normal with lows tonight falling into the lower 60s across the Nature Coast, and mid to upper 60s central and south, with highs on Thursday climbing into the lower to mid 80s. The models are in agreement a short wave moving towards the eastern seaboard down the backside of a strong upper ridge situated over New Mexico.
The high-end MVFR conditions at KAUS will improve to VFR over the next 1-2 hours as continued low-level mixing occurs. Temperatures will warm into the lower to middle 80s. High temperatures should be a few degrees warmer than yesterday given less afternoon cloud cover and drier air aloft, with most locations in the mid 80s. Low stratus tomorrow evening should keep lows similar to this morning's in the lower to mid 60s. Highs on Thursday will be about a degree warmer than today as high pressure continues to build in from the west to further suppress any shower activity or cloud development.
Mostly dry conditions for the day, as a cold frontal rain band remains just offshore.
In this scenario recently the low temperatures have been dropping below Superblend and went in that direction.
302 PM CDT Wed Oct 26 2016 The cold front currently extending from northeast MO to southeast KS will progress east into the forecast area through late afternoon and evening. Warmer temperatures return to the region by the end of the work week as southerly winds develop in response to a deepening trough over the northern Plains and an upper level ridge builds over the region from the southwest. The next cold front now looks like it will stall and weaken over northern MO late in the weekend, so have decreased pops to below 15 percent.
311 PM CDT Wed Oct 26 2016 Low pressure was in northwest Scott county IA and continued to track east near Interstate 80. Isolated showers were located in our far eastern counties, with an area of light rain/drizzle north and west of the low. Skies were sunny in the western/southern Plains associated with a high pressure ridge, and readings there were in 70s to lower 80s. Late tonight, our far sw cwa should see a decrease in clouds as high pressure begins nosing into that area. Minimum temperatures will drop into the lower to mid 40s at most locations. Thursday: High pressure will push into the cwa so skies will gradually become mostly sunny from southwest to northeast, as the upper level trough (cyclonic flow) shifts off to our northeast.
Tonight Through Thursday Dry high pressure will be over the area tonight and Thursday with a stable air mass over the area.
255 PM CDT Wed Oct 26 2016 The mid-level trough was progressing east of the area with a mid- level ridge stretching across the western U. This fog should dissipate by mid morning as conditions dry out in the low-levels with increased mixing.
With southerly return flow increasing throughout the day, temperatures should be able to reach nearly 60 degrees across the less cloudy areas to the west while the east remains in the low to mid 50s.
200 PM EDT Wed Oct 26 2016 Aviation It will be cold and wet today and tonight as low pressure tracks just south of Lower Michigan.
This ridge should make its way far enough east to preclude us from much fog, but I am the most concerned with our northeast corner that held on to stratus a bit longer than the rest until about noon to 1 pm, so this could be a factor. Heading into Thursday, upper level ridging will ensure warmer than normal temperatures.
300 PM EDT Wed Oct 26 2016 Cold front crosses Thursday with showers.
326 PM EDT Wed Oct 26 2016 Low pressure will bring rain to the region tonight and Thursday.
347 PM MDT Wed Oct 26 2016 With high pressure in place, conditions will remain dry and sunny over the next 48 hours.
Weak upper-level trough and accompanying scattered areas of -RA that moved through central MT this morning are now east of KHVR/KLWT.
309 PM CDT Wed Oct 26 2016 Early-afternoon water vapor imagery revealed a de-amplifying mid- level trough from the upper Great Lakes to Ozark Plateau with an upstream ridge gradually building east through the Interior West. ridge will begin to flatten as it edges east of the Rockies, hastening the deepening of a lee trough over the High Plains. As a result, strengthening southwest low-level flow will promote notably warmer temperatures, especially across our western counties where highs will reach the mid to upper 70s.
However, a widespread stratus field continues in shallow cold push behind exiting wave, at mid afternoon with moisture capped by warmer layer aloft. A very pleasant end of the work week is in store for the region, thanks to a large thermal ridge and deep southerly flow. The end result will be RH in the middle to upper 20s, and with a slight weakening of the surface winds due to the trough, we'll likely avoid any very high or extreme fire danger in central SD.
Strong high pressure will result in dry and warm conditions the remainder of the week, with well above normal daytime temperatures for late October. An anomalously strong ridge for late October continues to dominate our weather pattern. The ridge is currently centered to our south across Sonora with the ridge axis extending northward into Arizona. The warm temperatures will peak Thursday as the ridge shifts just east of the region resulting in a bit more southerly flow. By Wednesday, we are seeing more considerable differences amongst the deterministic 12Z GFS/CMC/ECMWF as well as their respective ensembles as the next trough moves in. The ECMWF remains the most robust with the trough as it moves through but confidence remains low during this time frame. High pressure will bring dry conditions above normal daytime highs through the coming weekend.
306 PM EDT Wed Oct 26 2016 Skies are partly cloudy with temperatures averaging in the lower to mid 80s along the Florida Keys. Meanwhile, local radars are only detecting a few light showers on the distant waters beyond 20 nm south of the Lower Keys. Surface wise, our area lies between lower pressure in the northwest Caribbean sea and a massive and formidable region of high pressure to our north.
Strong upper ridge to dominate next 24 hrs although high clouds to gradually increase aft 27/12Z. Weak nly wind shift over the ern plains at 18Z to transition to stronger lee trof aft 27/12Z. A strong dome of high pressure building over New Mexico will provide well above normal temperatures through the remainder of this week. Breezes will pick up this weekend as the high moves east and southwest flow increases over the southwest U. The latest water vapor loop shows an upper high developing over northwest Mexico. The 00Z GFS/EC show the high strengthening to ~590dm along the U.
138 PM EDT Wed Oct 26 2016 High pressure holds through today.
Cold front over southeast IA, still moving to the east and will be crossing through region overnight.
Issued by National Weather Service Gray ME 302 PM EDT Wed Oct 26 2016 Low pressure will move slowly away from the region tonight with weak high pressure moving overnight and into tomorrow. Low pressure will move out of southern New England toward the area tomorrow night with precipitation developing from south to north.
For tomorrow, highs close to persistence look likely, mainly in the lower to mid 80s.