Aikyam-Lab/Synoptic-Bench huggingface dataset:
326 AM CST Sat Feb 27 2021 Upper ridge centered over Cuba this morning and extending northward across the East Coast giving way to upper trough moving down across the Great Basin.
It's associated cold front will progress through central Illinois during the day on Sunday, with it progged to clear the entire area by Sunday evening. This does throw a wrench into things for daytime highs on Sunday as areas across the southeast will have the potential to hit peak heating before the front arrives whereas locations further north and west will see the front move through before that, hence cooler temperatures.
353 AM CST Sat Feb 27 2021 (Issued 353 AM CST Sat Feb 27 2021) Today through Sunday night: Mostly sunny skies and above normal temperatures will prevail today as high pressure passes by to the south. Attention then turns to low pressure approaching from the southwest tonight. The low will deepen Sunday as it tracks from sw Wisconsin into Ontario. The low will either clip the nw forecast area or move by just to the northwest. Could see a little freezing rain or snow mix in briefly for areas mainly north of Madison and Milwaukee as the precip begins later tonight.
Forecast highlights in the short term period will be cloudy conditions and cooler temperatures today compared to the last several days. Currently, broad upper level trough across central Canada extending into the Northern Plains, with an embedded mid level S/WV impulse tracking east across southern Saskatchewan. This feature is pushing a cold front south across the Northern Plains early this morning, and is also triggering areas of light snow across northern ND and the southern prairie provinces of Canada. Another embedded wave and cold frontal passage is expected later in the day Sunday, and will bring a shot of some light snow to northern and eastern areas of the region, and breezy and dry conditions to the west and south.
A very cold trough will reside over the region today providing unstable conditions. As showers wane this evening, some clearing skies will allow for temperatures to fall, especially from the higher elevations of Idaho to southwest Montana where lows will be in the single digits by Sunday morning. This will mainly be for the higher elevation locations. The reason being is that there is slight moisture moving around the upper level ridge over the Pacific coast and this could be enough to moisten the atmosphere enough for some light snow accumulations.
Broad southwest to northeast upper jet energy from the southern plains into the Great Lakes region early this morning, with another jet streak diving southeast on the western periphery of a developing upper trough. Combination of Pacific moisture aloft from the southwest and Gulf moisture in the low levels from the south will bring PW values over the southern 2 tiers of counties into the 1. A cold front will also approach from the west and move through the area overnight. Temperatures on Sunday will range from the low 50s in the northwest CWA to the mid 60s in the southeast.
710 AM EST Sat Feb 27 2021 Today warms back up as offshore high pressure pushes a warm front to our north.
/Tonight through Saturday/ High pressure centered over Illinois and points east has allowed for quiet conditions today with a few high clouds. The low will track across Kansas and cut across Iowa from southwest to northeast overnight. The bulk of the precipitation will fall just to the north and west of the area in the favored northwest portion of the low, where a band of heavier snow is expect to set up. Latest CAM guidance continues to indicate this band will develop generally from the Sioux Falls area and across southern Minnesota coincident with 850-700 mb frontogenesis, however any shift in the track of the low could have impacts for northern Iowa counties.
expect the focus to shift north as an approaching cold front pushes across the local area. could see some light precip across our north and east overnight with the passing cold front. expect a cooler day across the area with sunshine returning by afternoon.
1041 AM EST Sat Feb 27 2021 A broad area of high pressure centered over the western North Atlantic supports fresh east to southeast breezes across the coastal waters of the Florida Keys. Temperatures are near 80 with dewpoints in the lower 70s. High pressure over the western North Atlantic will maintain fresh east to southeast breezes across the coastal waters of the Florida Keys this afternoon through Sunday.
Showers and thunderstorms have already developed across SE OK early this afternoon near 925-850 front, and coverage will increase through late this afternoon as the warm front lifts northward. Then, later tonight, a cold front will move into NW OK around the same time and the I-35/I-44 corridor around 09Z. Afternoon highs Sunday will remain a couple degrees below average for most the area behind the cold front.
1234 PM EST Sat Feb 27 2021 Today warms back up as offshore high pressure pushes a warm front to our north.
High pressure and southeasterly flow has brought us a very warm day for this time of year.
High pressure will dominate the weather today. It's associated cold front will progress through central Illinois during the day on Sunday, with it progged to clear the entire area by Sunday evening. This does throw a wrench into things for daytime highs on Sunday as areas across the southeast will have the potential to hit peak heating before the front arrives whereas locations further north and west will see the front move through before that, hence cooler temperatures.
1125 AM EST Sat Feb 27 2021 A series of crossing low pressure troughs will return periodic rain to the Upper Ohio River Valley for the weekend.
215 PM CST Sat Feb 27 2021 A warm front continues to lift slowly north this afternoon, and was currently analyzed along the AR/LA border into northern TX. May see a temporary lull in the scattered storms after midnight, with additional convection developing along the southward advancing cold front late tonight into Sunday morning.
Sfc temps have climbed above freezing at most sites along with RWIS road temps - so patchy light freezing rain/icing is no longer a concern. Temperatures should edge back above freezing by that time or shortly thereafter.
237 PM EST Sat Feb 27 2021 Much of north GA remains in a wedge this afternoon as a warm front struggles to push north from central GA.
A warm front lifting north will spark SHRA and perhaps TSRA after 23z at the sites, followed by a drier period after 06z Sun.
No changes made to the forecast this morning as strengthening high pressure aloft will increase subsidence and maintain mostly dry conditions. The position of the ridge axis north of the area will maintain south/southeast winds today. Afternoon temps warm into the low 80s along the coast and mid 80s inland. Expecting mostly favorable boating conditions today as high pressure over the local waters maintains dry conditions.
246 PM CST Sat Feb 27 2021 An upper level trough is currently pushing east into the Central Plains this afternoon. Most of the area has warmed into the upper 50s to the lower 60s this afternoon. The exception is south central MO where clouds have keep temperatures cooler. The bulk of the activity will be these evening with it being more on and off overnight into Sunday morning as a cold front moves through the area. Brisk northwesterly winds will occur on Sunday, with slightly cooler conditions as highs will generally warm into the lower to middle 50s. In general, temperatures will be above normal through this week as highs in the 50s occur, with a few days in the lower 60s possible.
319 PM EST Sat Feb 27 2021 A broad area of high pressure centered over the western North Atlantic supports fresh east to southeast breezes across the coastal waters of the Florida Keys. Temperatures are in the lower 80s with dewpoints in the lower 70s. Water vapor imagery highlights a positively-tilted long wave trough axis over the Intermountain West, with southwesterlies racing across the southern tier of the United States. Mean layer ridging and subsidence dominates the Caribbean. The integrity of this inverted trough in the easterlies will wane as it approaches the Keys on Sunday, mostly due to the anticylonic curvature on the southwestern flank of the subtropical ridge.
A ridge of high pressure remains stretched from the Atlantic across the northern gulf coast this afternoon while low pressure is moving into the central Plains. Marine fog will continue to be issue along the coast with the moist air mass being pushed across the cooler shelf waters.
Warmer than normal temperatures are expected to return, causing temperatures to get as high as the 40s and 50s by late week.
RMB PREVIOUS DISCUSSION: With a low cloud deck and widespread north winds in place, the cold front has arrived over the region. Overnight tonight and into Sunday morning, the cold air mass will be retreating toward the east, making way for a broad, building ridge of warm, dry, high pressure from the west.
Expect brisk winds, patchy blowing dust and cooler temperatures in southeast Arizona Sunday.
High pressure centered over the western Atlantic along with a low moving across the midwest will maintain moderate southerly winds through the evening. Zonal flow aloft with an upper lvl low and associated trof in the central Rockies. Temperatures today will again be above normal for this time of year with upper 70s to near 80 as the warm front to the north moves into northern Arkansas by this evening.
1116 AM EST Sat Feb 27 2021 Today warms back up as offshore high pressure pushes a warm front to our north.
256 PM EST Sat Feb 27 2021 A brief round of light rain will move in late tonight into Sunday morning, followed by a push of warmer air that should bring highs into the 50s for many areas.
1156 AM CST Sat Feb 27 2021 (Today and tonight) A warm front is moving slowly north across the area, bringing slightly warmer temperatures, and more importantly, increased low level moisture. The low clouds and fog will continue to move slowly northward this morning, likely affecting much of the Concho Valley, and potentially areas as far north as the I-20 corridor.
The afternoon strong WAA over the western CWA has allow temperatures to rise into the lower 60s. These, well above normal temperatures will be short-lived as a upper level trough over the northern High Plains this afternoon shifts into the Central and Northern Plains. This will force a cold front into the area tonight. The local area looks to be split by the bulk of the moisture as the better forcing coinciding with a LLJ will be focused south and east of the CWA and the better upper level support will reside north of the CWA in the vicinity of the upper level trough.
A cold front will enter the northern Big Country just before daybreak and move south across the area during the morning hours. Highs tomorrow will range from the upper 50s across the Big Country, to the lower 70s over far southern counties.
A digging upper trough over the western Conus and upper ridge stretching north along the east Coast from high pressure over the Caribbean will bring southwest to northeast zonal flow to the Southeast through the Near Term. A semi- stationary cold front stretched northeast from the Southern Plains across the Tennessee River Valley. A low level ridge stretched west over the northern Gulf coast, bringing general southerly flow to the Southeast. Tonight into Sunday, with the persistent southerly flow of warmer Gulf air over cool near shore waters (buoy 42012 reporting 65F at 18z/noontime), advection fog is again expected to spread inland tonight. Low temperatures in the low to mid 60s expected. Sunday, the forecast area will see another day of well above seasonal norms due to the persistent upper ridge.
Morning IR satellite imagery showing colder cloud tops along a line from n-central Idaho through southeast Oregon delineating the back edge of the exiting trough. Showers will continue across the area this morning, decreasing in coverage this afternoon as the trough works eastward.
643 PM EST Sat Feb 27 2021 A warm front will lift north into the region late tonight, followed by a cold front late Sunday afternoon into Sunday evening.
Any snow cover will affect highs for Sunday despite the sunshine and warmer west winds. The winds Sunday night will again turn from west southwest to north through the night as a cold front pushes in. The exception will be PIR and ATY tonight into Sunday morning as a short wave trough kicks out across the southern part of our region bringing light rain and snow with it.
The fog will be most likely to be dense in and around shallow waters as well as cooler bodies of water such as the larger rivers and lakes.
948 PM EST Sat Feb 27 2021 A warm front will lift north into the region late tonight, followed by a cold front late Sunday afternoon into Sunday evening.
Periods of gusty north winds will continue across exposed ridges and coastal areas this afternoon and early this evening. Some gusty winds will develop over the ridges of Lake County starting tonight.
Have seen a few -shsn over the central mountains and some virga in the Pikes Peak region with weak instability and lift provided by upper trough passing by to the north, though dry low level air mass was limiting any accumulations. On Sunday, secondary upper low closes off and drifts south into ern AZ, providing enough lift for the redevelopment of snow showers over mainly the ern San Juans and srn Sangres, where the higher peaks could see an inch or two of accumulation by late day. Max temps around the region will be much cooler than the past few days, and winds will become much lighter as well, especially in the afternoon. This low is anticipated to propagate to the east, likely staying south enough to keep most of the precipitation south as well.
/Issued 237 PM EST Sat Feb 27 2021/ Much of north GA remains in a wedge this afternoon as a warm front struggles to push north from central GA.
Upper level flow on Sunday becomes northwesterly, with an embedded wave and attendant cold front expected to push through in the afternoon and evening. Daytime highs range from the low 20s north central to around 40 south central and southwest.
A warm front is beginning to push into Tennessee providing shower development south of I-40. The Plains low pressure system will move towards the Mid- South and its trailing cold front will move through the region and move south by Sunday night.
By Sunday morning, the developing system, initially a positively tilted trough, will mature over the Mongollon Rim before starting to edge eastward. Winds will trend more westerly this evening followed by a cold front bringing winds around to the north in the period midnight through sunrise (N to S). This will also allow surface temperatures Sunday night to drop to near or below freezing for locations west of the Caprock escarpment. While locations to the east of the excarpment may drop to near freezing.
Farther south, as the inverted trough moves through the are this evening, could see a isolated showers develop.
409 PM EST Sat Feb 27 2021 A warm front will lift north into the region late tonight, followed by a cold front late Sunday afternoon into Sunday evening.
This afternoon accumulations will be on grassy surfaces as road temps are well above freezing. Snow showers will diminish overnight Sunday as a ridge of high pressure builds into the region.
Any snow cover will affect highs for Sunday despite the sunshine and warmer west winds. The winds Sunday night will again turn from west southwest to north through the night as a cold front pushes in.
While winds will be steady behind a cold front, relative humidity values have increased. expect the focus to shift north as an approaching cold front pushes across the local area. could see some light precip across our north and east overnight with the passing cold front. expect a cooler day across the area with sunshine returning by afternoon.
Upper trough axis extended from the northern Rockies to the Desert Southwest, with a low over northeast WY. Cyclonic flow, QG lift in proximity to the upper low, and low level convergence along surface boundary was enhancing snowfall rates from northern and central WY into western SD. Accumulations will range from 1 to 4 inches, heaviest along the Pine Ridge with localized upslope.
237 PM MST Sat Feb 27 2021 Upper trough axis extended from the northern Rockies to the Desert Southwest, with a low over northeast WY. Cyclonic flow, QG lift in proximity to the upper low, and low level convergence along surface boundary was enhancing snowfall rates from northern and central WY into western SD. Accumulations will range from 1 to 4 inches, heaviest along the Pine Ridge with localized upslope.
Other story of the day is the cold air still filtering in behind a departing trough as temperatures are struggling to make it into the 20s this afternoon. This cold weather should be short-lived as a strong ridge builds into the area and this will be the main weather story of the upcoming week.
A drastic difference in the low level moisture profile is evident across eastern KS, where dew points are into the 40s at most sites. By Sunday, northerly winds will remain blustery for the first half of the day with decreasing winds by mid afternoon as surface ridging moves in.
Fog will effect most of the area as a warm front continues to push north of the region and sea fog persists along the coastal areas. Sunday dawns cloudy and foggy then will be watching for development near the cold front that will be sagging south.
516 PM CST Sat Feb 27 2021 An upper level trough is currently pushing east into the Central Plains this afternoon. Most of the area has warmed into the upper 50s to the lower 60s this afternoon. The exception is south central MO where clouds have keep temperatures cooler. The bulk of the activity will be these evening with it being more on and off overnight into Sunday morning as a cold front moves through the area. Brisk northwesterly winds will occur on Sunday, with slightly cooler conditions as highs will generally warm into the lower to middle 50s. In general, temperatures will be above normal through this week as highs in the 50s occur, with a few days in the lower 60s possible.
Forecast temps are a little cooler on the plains from the current bit of low level cold advection. Clouds will continue to clear Sunday night with northerly winds aloft as the trough continues to sink south. This combined with light winds will result in cooler overnight lows. Ended up going towards the coldest guidance in the high mountain valleys, as well as near Greeley and Limon, where cold pools tend to settle in. The exception will be along the foothills where a tightening surface pressure gradient will keep in breezy downslope winds in the foothills, promoting warmer temperatures, but this will be limited due to the clear skies.
414 PM MST Sat Feb 27 2021 Upper trough axis extended from the northern Rockies to the Desert Southwest, with a low over northeast WY. Cyclonic flow, QG lift in proximity to the upper low, and low level convergence along surface boundary was enhancing snowfall rates from northern and central WY into western SD. Accumulations will range from 1 to 4 inches, heaviest along the Pine Ridge with localized upslope.
The trailing wave in the trough is now digging down through the heart of the Great Basin toward the 4 Corners. The trough will continue a slow southerly drift across the CWA tonight as it elongates due to the energy closing off a low to our SW. The cold air and jet aloft is likely to keep isolated to scattered showers over the Colorado high country under the core of the trough. The trough swings across the far SE portion of the CWA on Sunday and this is when the southern mountains should see the better coverage of snow showers. This remains true for Sunday night and some of the high basins may see double digit readings below zero.
CD Chattanooga Airport, TN 58 75 52 58 38 / 20 40 100 60 10 Knoxville McGhee Tyson Airport, TN 55 74 51 55 34 / 20 40 100 70 0 Oak Ridge, TN 54 73 49 55 33 / 40 40 100 50 0 Tri Cities Airport, TN 51 75 49 54 29 / 40 40 100 70 0 TN.
Short range model guidance (including the HRRR & NAM 3km) show the snow shower activity lessening throughout this afternoon and finally moving out of the region by this evening as the core of the low pressure trough shifts southeastward. As this happens, winds are forecast to shift to a more easterly direction, decreasing in intensity across western Nevada, but increase along the Sierra ridges and the western slopes of the Sierra overnight. Cold, overnight low temperatures are expected tonight into Sunday morning for the Sierra and western Nevada as clouds clear and winds diminish behind a cold front.
Sunday dawns cloudy and foggy then will be watching for development near the cold front that will be sagging south.
A warm front is begininng to push into Tennessee providing shower development south of I-40. The Plains low pressure system will move towards the Mid- South and its trailing cold front will move through the region and move south by Sunday night.
MVFR ceilings are likely to lower into IFR category for much of the region overnight ahead of the cold front which will move into NE OK before sunrise and clear southern terminals around the end of the fcst period. /Issued 215 PM CST Sat Feb 27 2021/ A warm front continues to lift slowly north this afternoon, and was currently analyzed along the AR/LA border into northern TX. May see a temporary lull in the scattered storms after midnight, with additional convection developing along the southward advancing cold front late tonight into Sunday morning.
A low pressure system to our east has brought breezy north to east winds with gusts of 45 mph to interior Northern California.
Breezy southwest winds will continue into the early evening, with winds gradually veering to the west ahead of an approaching cold front. By Sunday morning, the developing system, initially a positively tilted trough, will mature over the Mogollon Rim before starting to edge eastward. Winds will trend more westerly this evening followed by a cold front bringing winds around to the north in the period midnight through sunrise (N to S). This will also allow surface temperatures Sunday night to drop to near or below freezing for locations west of the Caprock escarpment. While locations to the east of the escarpment may drop to near freezing.
627 PM EST Sat Feb 27 2021 A brief round of light rain will move in late tonight into Sunday morning, followed by a push of warmer air that should bring highs into the 50s for many areas.
255 AM EST Sun Feb 28 2021 Rain is expected today with the highest amounts south of highway 24.
/issued 1009 PM CST Sat Feb 27 2021/ Skies are cloudy across the Mid-South this evening with temperatures ranging from the lower 50s to lower 70s. A warm front is beginning to push into Tennessee providing shower development south of I-40. The Plains low pressure system will move towards the Mid- South and its trailing cold front will move through the region and move south by Sunday night.
1131 PM CST Sat Feb 27 2021 An upper level trough is currently pushing east into the Central Plains this afternoon. Most of the area has warmed into the upper 50s to the lower 60s this afternoon. The exception is south central MO where clouds have keep temperatures cooler. The bulk of the activity will be these evening with it being more on and off overnight into Sunday morning as a cold front moves through the area. Brisk northwesterly winds will occur on Sunday, with slightly cooler conditions as highs will generally warm into the lower to middle 50s. In general, temperatures will be above normal through this week as highs in the 50s occur, with a few days in the lower 60s possible.