Aikyam-Lab/Synoptic-Bench huggingface dataset:
640 PM EDT SUN SEP 6 2015 JUST THINING CIRRUS SPILLING OVER THE UPPER LEVEL RIDGE THROUGH MUCH OF THE NIGHT. WILL ONLY INTRODUCE A CHANCE OF THUNDERSTORMS FOR MBS MONDAY AFTERNOON AS THEY ARE CLOSER TO BOTH THE UPPER LEVEL FORCING AND THE APPROACHING COLD FRONT. THIS EVENING AND TONIGHT THE UPPER LEVEL RIDGE IS FORECASTED TO TILT EASTWARD TONIGHT AS A RANCH OF THE JET STREAM BUILDS OVER THE NORTHERN PLAIN STATES. THIS IS NOT OF A SIGNIFICANT CONSEQUENCE AS THE UPPER LEVEL RIDGE WILL REMAIN IN CONTROL OF THE WEATHER LOCALLY THROUGH THE END OF THE PERIOD. DEWPOINTS THIS AFTERNOON HAVE LOWERED SOMEWHAT SURPRISINGLY INTO THE LOWER TO MIDDLE 60S. THIS WILL INCREASE FGEN ALONG THIS STALLED BOUNDARY AND GRADUALLY FORCE IT BACK TO THE NORTH AS A WARM FRONT.
CURRENTLY A COLD FRONT EXTENDS FROM NORTHEAST NEBRASKA TO NORTHERN KANSAS. THE FRONT WILL STALL THIS EVENING AND BEGIN LIFTING BACK NORTH AS A WARM FRONT TOWARD MORNING. A WARM FRONT WILL EXTEND FROM THE LOW ACROSS SOUTHWEST INTO CENTRAL PORTIONS OF NEBRASKA. THIS WARM FRONT COULD CERTAINLY SERVE AS A FOCUS FOR THUNDERSTORM DEVELOPMENT DURING THE AFTERNOON HOURS.
NORTHERN ARIZONA IS CURRENTLY POSITIONED BETWEEN AN UPPER LEVEL TROUGH TO THE WEST AND AN UPPER LEVEL RIDGE TO THE EAST. EXTENDED RANGE MODELS INDICATE STRENGTHENING HIGH PRESSURE AND DRYING NORTHWESTERLY FLOW ALOFT FOR THE SECOND HALF OF THE WEEK.
However the upper level ridge axis will remain across the Ozarks region into Labor Day while an upper level trough traverses the southern Canadian provinces and the northern tier of the U.
THE REGION IS LOCATED BETWEEN A RIDGE TO THE WEST AND A TROF TO THE EAST. THE UPPER LEVEL LOW IN THE EASTERN GULF IS PROG TO MOVE WEST ACROSS THE NORTHERN GULF OVER THE NEXT SEVERAL DAY. THE LOW LOOKS TO BECOME ABSORBED IN THE FLOW WITH A TROF PATTERN SETTLING UP BACK TO THE WEST LATE IN THE WEEK.
THE FORECAST AREA IS LOCATED INBETWEEN A WEAK MID/UPPER LEVEL LOW OVER THE SOUTHEAST CONUS AND AN UPPER RIDGE CENTERED OVER TEXAS. MODERATELY STRONG NORTHERLY FLOW WAS NOTED ACROSS THE LOWER MISSISSIPPI VALLEY AND CENTRAL GULF COAST REGION BETWEEN THESE TWO FEATURES. MODELS FORECAST THE MID/UPPER LOW TO RETROGRADE ACROSS THE NORTHERN GULF THROUGH THE WORK WEEK AND GRADUALLY WEAKEN.
250 PM PDT SUN SEP 6 2015 A WARMING TREND IS EXPECTED THROUGH THE WEEK AS UPPER-LEVEL HIGH PRESSURE OVER TEXAS EXPANDS WEST. A WARMING TREND CONTINUES TODAY AS HIGH PRESSURE EXPANDS WEST AND BUILDS OVER THE AREA. MOST LOCATIONS ARE 5 TO 10 DEGREES WARMER THAN THIS TIME YESTERDAY.
MAYBE A PASSING SHOWER FOR THE HIGHER TERRAIN WITH AN OCCASIONAL RUMBLE OF THUNDER AND SEASONAL TEMPS. ENOUGH MOISTURE WILL LINGER FOR A FEW LATE DAY SHOWERS AND THUNDERSTORMS OVER THE HIGHER TERRAIN. AT MOST A COUPLE DEGREES WARMER THAN TODAY. BY WED THE SUBTROPICAL RIDGE WILL HAVE SHIFTED WESTWARD. THE RIDGE WILL CONTINUE TO BUILD OVER THE WEST COAST THROUGH THE WORK WEEK.
341 PM EDT SUN SEP 6 2015 UPPER LEVEL RIDGE THROUGH THE HOLIDAY WEEKEND. SHOWERS INCREASE MID WEEK AHEAD OF A COLD FRONT.
156 PM EDT SUN SEP 6 2015 DEEP COLUMN RIDGING WILL KEEP CONDITIONS QUIET THROUGHOUT THE TAF PERIOD. WARMER TEMPERATURES TODAY AND CONTINUED SOUTHWESTERLY GRADIENT FLOW WILL KEEP TEMPERATURES WARMER OVERNIGHT. THIS WILL ALL LEAVE SE MI UNDER INCREASING MID LEVEL HEIGHTS AND AND LL WAA DUE TO SWERLY FLOW AHEAD OF THE NEXT TROUGH/FRONT.
/ISSUED 1022 AM CDT SUN SEP 6 2015/ Upper ridge axis extending from southwest to northeast across the southern plains continues its firm hold over the region this morning.
AN UPPER LOW OVER THE EXTREME SOUTHEAST STATES DRIFTS SLOWLY WESTWARD THROUGH THE PERIOD WHILE UPPER RIDGING OVER THE SOUTHERN AND CENTRAL PLAINS WEAKENS AS A LONGWAVE SYSTEM ADVANCES INTO THE NORTHERN PLAINS. WHILE MODEL SOUNDINGS SHOW THAT MID LEVEL TEMPERATURES COOL SOMEWHAT WITH THE ADVANCE OF THE UPPER LOW INTO THE FORECAST AREA. LOWS TONIGHT WILL RANGE FROM AROUND 70 INLAND TO THE LOWER/MID 70S NEAR THE COAST. HIGHS ON MONDAY WILL BE MOSTLY IN THE LOWER 90S.
HIGH PRESSURE REMAINS OVER THE MID-ATLANTIC STATES THIS AFTERNOON AND THIS FEATURE WILL NOT MOVE MUCH OVER THE NEXT COUPLE OF DAYS.
307 PM CDT SUN SEP 6 2015 COLD FRONT HAS CLEARED THE REGION. COOLER/MUCH DRIER AIR HAS PUSHED INTO THE WESTERN DAKOTAS WITH DEWPOINTS FALLING INTO THE 30S. HIGH PRESSURE MOVES OVERHEAD. WITH THE UPPER LOW TO THE NORTHWEST. SEVERAL WAVES WILL PIVOT AROUND THE BASE OF THE LOW AND AFFECT THE REGION.
132 PM EDT SUN SEP 6 2015 HIGH PRESSURE WILL CONTINUE TO WEDGE SOUTH ALONG THE EASTERN SLOPES OF THE APPALACHIANS THROUGH THE WEEKEND. WARMER AND MORE HUMID AIR.
821 AM EST Sat Dec 12 2020 Rain chances increase today as a low pressure system advances through the Upper Midwest and into the western Great Lakes.
This band was originally intitiated by a mid level wave and its associated cold front moving out of the Plains yesterday, but the wave has weakened and moved into the OH valley. /GG/ Sunday: We will remain in a rather progressive pattern as a longwave trough persists over the central CONUS. As the low tracks eastward, increasing isentropic ascent will result in rain returning to the region by Sunday afternoon. More appreciable rainfall (some areas picking up 1"+) will come Sunday evening and overnight as the low tracks from central LA through eastern MS. This low track will permit sufficient instability for isolated thunder during the day across southwestern portions of the forecast area.
600 AM CST Sat Dec 12 2020 (Today and tonight) Surface cold front is currently located along a San Angelo to Brady line early this morning. South winds will quickly return this evening, ahead of an approaching upper trough over the southern rockies. Later tonight, a strong low level jet will develop in advance of the approaching upper trough, with low clouds developing and spreading north across the area after midnight. Lows tonight will range from the upper 30s and lower 40s across the Big Country, to the lower and middle 40s elsewhere, and should occur shortly after midnight, with temperatures likely rising into the 50s across southern sections as warm air advection ramps up.
There is also low pressure energy back over western Canada poised to dive southeastward across the region on Sunday.
500 mb short wave and associated surface cold front in northern Alberta at 09z will quickly move southeast. To start the work week, cold air will filter in to the Red River Valley as a high pressure system at the surface moves through.
Snow continues to taper off across the region from west to east as a potent mid/upper trough slides east of the area. Temperatures at the surface hovered near freezing or even above for much of the night allowing quite a bit of snow to melt preventing higher snowfall totals. Temperatures will continue to hover around or just below freezing throughout the day with cloud-cover lingering through much of the day. Sunday should remain dry with a cold front sliding into the area by late afternoon.
438 AM EST Sat Dec 12 2020 Water vapor imagery highlights deep-layer ridging across the Western Caribbean. This ridging has ceded some ground over the past 24 hours to the maelstrom of lower heights scouring the western 2/3rds of the United States. A very small scale inverted trough is across the Florida Keys, with southeast winds near 20 knots across the eastern zones, and northeast winds 10 to 15 knots to the west. The forecast calls for a chance of showers (30%) for the island chain, with chances decreasing after the inverted trough flattens later this morning or early this afternoon. The mean layer ridge will maintain its real estate over the Western Caribbean today through Sunday night, although the low-level ridge axis will sag southward.
Still expecting with the track of the low, the most of the central zones, from Big Timber/Harlowton to Miles City will continue to be in a very favorable area for snowfall through mid-day. The first system will enter the west Sunday night after a brief period of ridging through the day.
After lows this morning drop to the low-mid 20s, highs both today and Sunday will only reach the upper 20s to mid 30s.
410 AM MST Sat Dec 12 2020 A broad low pressure circulation will slowly exit southeast of the Northern Rockies today, with snow slowly dwindling across the region. Travel conditions are anticipated to improve this afternoon, however temperatures will remain mostly below freezing for much of the area. Brief high pressure will move over the Northern Rockies on Sunday, creating favorable conditions for localized morning fog for many area valley locations.
407 AM CST Sat Dec 12 2020 Rain is coming to an end across the area as a cold front it currently moving across the Mid South this morning. A cooler day is expected today, but we should remain dry for the rest of the day.
340 AM CST Sat Dec 12 2020 Snow continues to taper off across the region from west to east as a potent mid/upper trough slides east of the area. Temperatures at the surface hovered near freezing or even above for much of the night allowing quite a bit of snow to melt preventing higher snowfall totals. Temperatures will continue to hover around or just below freezing throughout the day with cloud-cover lingering through much of the day. Sunday should remain dry with a cold front sliding into the area by late afternoon.
An area of stratus and fog continues to move into the area from the northwest behind a cold front. A second and stronger cold front will begin to move through the area by Sunday afternoon.
High pressure will continue to ridge across the area at the surface and aloft through the period.
Sunday into Sunday night, high pressure at the surface and aloft will keep the airmass dry and stable. Temperatures will still be cooler than normal, with poor mixing and snow cover in place.
528 AM CST Sat Dec 12 2020 A long wave trough of low pressure aloft was the main H5 feature across the CONUS tonight. This trough extended from southern Canada into south Texas. East of the long wave trough, low amplitude ridging was present from the Mid-Atlantic into New England. However, cloudy skies remained and patchy fog had developed across portions of the forecast area, and 3 AM CT temperatures were in the lower to middle 20s. This should burn off by late morning, however, mostly cloudy skies will remain in place today and highs will struggle to get out of the lower to mid 30s. On Sunday, a weak cold front will push through portions of the area in the morning.
An upper level low is moving through SW Montana early this morning and will move across Wyoming today. The low moves to the east tonight and flow aloft turns to the NW. A wave in the NW flow aloft will bring a cold front through NE Montana late tonight with enough moisture in the east for a chance of light snow. Look for dry weather on Sunday with high pressure over the area.
/issued 407 AM CST Sat Dec 12 2020/ Rain is coming to an end across the area as a cold front it currently moving across the Mid South this morning. A cooler day is expected today, but we should remain dry for the rest of the day.
The latest runs of the hi-res meso-scale models indicate this band of heavier snow will move to the east/northeast as the area of low pressure near St. 00z deterministic models are fairly good agreement that a cold front will move through the region on Sunday night.
152 AM PST Sat Dec 12 2020 A cold front will move through the region today, bringing gusty winds through the wind-prone areas of Central California during the day. 50 inch have already accumulated, with the higher amounts towards Merced County. This system will be similar in trajectory as the current system, with the upper-level trough moving as an inside-slider, although most of the moisture will pass over northern portions of our forecast area, or Fresno County northward. Precipitation will taper off on Sunday evening as the upper-level low and trough move eastward into the Great Basin.
648 AM EST Sat Dec 12 2020 Deepening low pressure will quickly advance through the area today as rain diminishes southwest to northeast this afternoon. As such expect rain to diminish sw-ne early to mid aftn as mid level dry slot and attendant cold front sharpen across the area. However lake modification within marginally cold enough low level thermal trough will curtail any potential snow accumulation nw.
A second and stronger cold front will begin to move through the area by Sunday afternoon.
Sunday, precip will spread back across the region by late afternoon, continuing into the night with highest PoPs across the southern 1/2 of our area, especially SEMO into west KY, as an upper wave move across the lower MS Valley and TN valley regions. With surface temperatures above freezing through the event, not concerned with impacts at this time.
A ridge of high pressure will move east today across the Central Plains. This and the cool airmass in the low levels will keep highs on the cool side. A large trof this is currently across the Northern Rockies will dive southward today. There is quite a bit of cold air associated with this trof. Went cooler with highs, where the highest snowfall accumulations are expected. Warmer elsewhere.
The front that passed thru and now situated in the Gulf will return northward as a warm front. ahead of a fairly strong cold front that'll be pushing across the region between roughly noon/18z (CLL) and 5pm/23z (GLS).
1157 AM CST Sat Dec 12 2020 A long wave trough of low pressure aloft was the main H5 feature across the CONUS tonight. This trough extended from southern Canada into south Texas. East of the long wave trough, low amplitude ridging was present from the Mid-Atlantic into New England. However, cloudy skies remained and patchy fog had developed across portions of the forecast area, and 3 AM CT temperatures were in the lower to middle 20s. This should burn off by late morning, however, mostly cloudy skies will remain in place today and highs will struggle to get out of the lower to mid 30s. On Sunday, a weak cold front will push through portions of the area in the morning.
(This evening through Sunday) A warm front will lift north and east across the southern half of West Central Texas after midnight. Overnight lows will range from the upper 30s across the Big Country to the low to mid 40s elsewhere. Temperatures across the southern half of the area will slowly increase after midnight, reaching the low 50s by daybreak. An upper level low will track across the South Plains on Sunday. This will send a cold front through West Central Texas Sunday morning. In addition, light showers are possible across the Big Country and eastern portions of the forecast area, as the trough tracks to our north.
Another storm system is set to impact the region beginning late tonight and lasting through tomorrow, bringing the potential for a mixed bag of wintry precip to the low elevations, and moderate mountain snow.
Rain is coming to an end across the area as a cold front it currently moving across the Mid South this morning. A cooler day is expected today, but we should remain dry for the rest of the day.
255 PM CST Sat Dec 12 2020 Plenty of cloud cover persists this evening and overnight as the region sits under a broad longwave trough. A dry cold front moves through on Sunday. This feature will usher in a cooler and drier air mass, but the enhanced mixing ahead of the Canadian air should allow temperatures to reach above normal for one more consecutive day.
These storms will be a bit warmer so the lower elevations may see rain or snow. As the next system approaches the coast, the pressure gradient will switch to easterly, which will clear out Lewiston and Pullman, while pushing the low clouds into Wenatchee and the Cascades late this afternoon or this evening. The next weather system looks really pretty on satellite, with a nice circulation, cold air digging on the back side of the low. But the clouds out ahead of it tell the story; they're not going anywhere and you can see that they are being held up by a ridge of high pressure. So the low will go well north into Alaska, and all we'll get is a stretched out weak cold frontal band. The warm front ahead of it is largely dry.
A warmer and muggier maritime tropical air mass will overspread the Keys this weekend.
The trough will drive a cold front across the area too with falling temperatures and windy conditions expected behind the front.
Temperatures are slow to warm with cold air advection in place across much of our region in the wake of a strong cold front that moved through our region last night. The exception to this is across our eastern third where temperatures are much warmer due to the late arrival of the front. As an upper level trough approaches our airspace from the west, upper forcing will increase significantly such that we will likely see precipitation beginning to break out across our western half towards the tail end of the TAF period so have introduced prevailing showers in the 14-15z timeframe on Sunday across the TYR/GGG and LFK terminals with VCSH mentioned at the TXK/SHV terminals by 15z.
1251 PM EST Sat Dec 12 2020 Low pressure will move northeast across the Great Lakes today, while its associated cold front moves east through the Ohio Valley. The low and front will move away from the region tonight, followed by weak high pressure on Sunday.
/Updated at 1030 AM CST Sat Dec 12 2020/ Cold front continues to advance slowly across the state giving most everyone a chance of measurable precip through this evening, albeit light.
252 PM EST Sat Dec 12 2020 Low pressure continues to move rapidly northeast this afternoon while gradually deepening. A potent upper low swings across Texas on Sunday, but the daytime hours will remain dry.
Light rain has spread into Middle Tennessee early this morning ahead of a cold front currently across southeast Missouri and eastern Arkansas. Waves of light rain are expected to continue through the morning hours but gradually shift eastward with time as the cold front pushes into and across the forecast area, with all rain ending by early afternoon at the latest.
High pressure will slowly be pushed east tonight. Northwest winds will increase behind the trough/sfc cold front. There is the possibility for some very light snow or flurries with a short wave in the upper trough. Canadian high pressure builds in Sunday night ushering in some caa with H85 temps falling as low as -14C.
Rain won't be continuous, so went with a VCSH and a TEMPO group to account for the highest chances of when rain occurs. Chattanooga Airport, TN 44 61 43 49 33 / 20 10 100 20 0 Knoxville McGhee Tyson Airport, TN 46 60 41 47 30 / 30 10 100 50 0 Oak Ridge, TN 42 59 39 47 29 / 20 10 90 40 0 Tri Cities Airport, TN 46 57 37 45 25 / 30 0 100 60 0.
247 PM CST Sat Dec 12 2020 The main focus in the short term is the cold frontal passage late tonight into Sunday, which brings the most impacts. Do not anticipate any change in these conditions until very late tonight, as the next short wave and associated cold front swing through the FA.
Surface temperatures are expected to be above freezing for the most part while the precip moves into the region during the mid/late morning and continues in the afternoon.
205 PM EST Sat Dec 12 2020 Rain chances continue through the evening as low pressure system advances through the Upper Midwest and into the western Great Lakes.
Combined with light winds and high pressure overhead, should see temps drop a bit cooler as well. A surface cold front will accompany this wave and decent convergence along it will support a band of snow showers, most intense and numerous across northern Minnesota.
The cold front will also clear the area shortly, and gusty west to northwest winds will continue to usher in colder air this evening. Overnight lows will be in the low to mid 30s, and while some places may be near or below freezing, the ground should stay warm enough for now to preclude any snow accumulation. Much cooler temperatures are in store for the coming week. Broad troughing will remain over the region on Sunday night, and northwest flow aloft will continue to facilitate cold air advection.
1142 AM CST Sat Dec 12 2020 GOES-16 satellite imagery shows clearing behind the cold front which is currently situated over western KY, western TN, and western MS. Northerly winds are ushering in cooler air behind the front. Rain is coming to an end across the area as a cold front it currently moving across the Mid South this morning. A cooler day is expected today, but we should remain dry for the rest of the day.
A large, broad long-wave trof was positioned over the CONUS. The high level flow over the forecast area is southwesterly while at the surface, a cold front was analyzed from the MS River Valley, draped southwest across LA to the upper TX coast. Ahead of the front, pre-frontal trof was easing eastward over southeast LA which is intersecting a narrow band of moisture, (PWATs 1. The surface cold front is progged to settle across the I-65 corridor tonight into Sunday morning where it slows/stalls, then lifts north as a warm front Sunday afternoon in response to a wave of surface frontal low pressure lifting northeastward over LA/southwest MS.
Issued by National Weather Service Tampa Bay Ruskin FL 121 PM CST Sat Dec 12 2020 An area of low pressure moves through the Great Lakes region with the trailing edge of the associated cold front extending over southeast Louisiana. High pressure briefly builds into the area later today before the next weather system moves through on Sunday afternoon. The next area of low pressure develops along the boundary as it lifts northward on Sunday afternoon.
1114 AM CST Sat Dec 12 2020 (Today and tonight) Surface cold front is currently located along a San Angelo to Brady line early this morning. South winds will quickly return this evening, ahead of an approaching upper trough over the southern rockies. Later tonight, a strong low level jet will develop in advance of the approaching upper trough, with low clouds developing and spreading north across the area after midnight. Lows tonight will range from the upper 30s and lower 40s across the Big Country, to the lower and middle 40s elsewhere, and should occur shortly after midnight, with temperatures likely rising into the 50s across southern sections as warm air advection ramps up.
Morning satellite imagery showing lingering low and mid-level cloud cover across southeast Oregon and central Idaho mountains in the wake of an exiting trough.
Winds will increase in the gap areas Sunday morning as high pressure builds over Yellowstone National Park. Cloud cover returns Sunday keeping overnight lows Sunday night warmer than what we will see tonight.
A cold front moves through tonight bringing isolated snow showers to the eastern zones and some of the coldest air that we've seen this season. An upper level low is moving through SW Montana early this morning and will move across Wyoming today. The low moves to the east tonight and flow aloft turns to the NW. A wave in the NW flow aloft will bring a cold front through NE Montana late tonight with enough moisture in the east for a chance of light snow. Look for dry weather on Sunday with high pressure over the area.
As such expect rain to diminish sw-ne early to mid aftn as mid level dry slot and attendant cold front sharpen across the area. However lake modification within marginally cold enough low level thermal trough will curtail any potential snow accumulation nw.
225 PM PST Sat Dec 12 2020 A cold front will move through the region today, bringing gusty winds through the wind-prone areas of Central California during the day.