Aikyam-Lab/Synoptic-Bench huggingface dataset:
528 AM CST Wed Dec 7 2016 The southern edge of the stratus associated with the upper low over southern Ontario continues to remain near our area this morning. NAM model soundings struggle to erode the low-level moist layer, and even if any clearing of the lower clouds occurs, mid-level cloud cover is spreading northeastward into NE IA and SW WI, so once again expect most areas to remain on the cloudy side with some flurries possible under lower cloud cover today.
1017 AM EST Wed Dec 7 2016 An approaching cold front will move through the forecast area Thursday.
The cyclone will track east across southern Ontario today and tonight. Another lobe of energy will wrap around the back side of the low and provide a chance of light snow for central ND today and tonight. Snow accumulations will be light with maybe an inch or so in the Turtle Mountains, and a half inch or less for most areas along and east of the Highway 83 corridor. Arctic high pressure will continue to build south along the front range of the Rockies and slowly push into the western dakotas during this same timeframe.
The trough axis has pushed east of the Continental Divide and drier air was filling in behind the system. The axis of the trough was just reaching the Continental Divide at 10Z, but a weaker secondary wave combined with divergence on the nose of a 120 knot jet sustained snowfall. With the main trough east of the forecast area by 12Z, subsidence and drying begin. Expect snow showers to diminish early this evening as mid-level warm air advection (WAA) stabilizes the drier post-trough environment. However, clouds will be increasing during the day as moisture tops the ridge to the west. EC and GFS both indicated mid-level moisture may be sufficient for some light snowfall over the northern and central mountains but only bringing up to an inch across the higher peaks and ridges.
The broken line around the Keys is spreading out while weakening west of the lower Keys, and still showing some slightly better organization south of the upper Keys. A cold front will move over the southeastern Gulf of Mexico Thursday night ushering an Artic airmass into the southeast United States.
There is the potential for a winterly mix of light sleet, light snow, and even freezing light late tonight as an upper level trough approaches and mid levels of the atmosphere saturate. Surface temperatures along the I-10 corridor may not fall below freezing until after sunrise. Highs today will range from the lower 50s in the Big Country to around 60 in the Concho Vally southward to Ozona.
Any lingering fog will scour out by mid-morning, but as sfc winds veer to the east southeast /upslope component/, the low cloud cover will persist and subsequently, so will bouts of drizzle/light rain. This evening-tonight, a longwave trough will move from the Rockies onto the Plains and will send a breezy cold front across the region /15-20 mph especially across far east TX which is nearing Lake Wind Advisory criteria/.
Chattanooga Airport, TN 54 36 44 23 / 0 20 20 10 Knoxville McGhee Tyson Airport, TN 52 34 43 21 / 0 20 20 10 Oak Ridge, TN 52 33 43 21 / 0 10 20 0 Tri Cities Airport, TN 50 33 41 19 / 10 20 20 10.
849 AM EST Wed Dec 7 2016 A weak trough will move across the region today.
511 AM CST Wed Dec 7 2016 High pressure ridge sitting across southern IL will keep the surface winds across the CWA out of the west to northwest next 24hrs. In the upper levels, a weak trough will move toward the area today, reaching the CWA overnight. Most of the central and southeast parts of the CWA will see temps above freezing, while the northern areas, including Galesburg, Peoria, and Bloomington will be below freezing. The location of the high pressure ridge will allow much colder temps to advect into the area for tonight. So, expecting lows ranging from around 15 in the northwest to the lower 20s in the southeast.
924 AM EST Wed Dec 7 2016 Low pressure north of the great lakes region will move northeast through tonight.
659 AM EST Wed Dec 7 2016 High pressure will build over the region through mid week.
948 AM EST Wed Dec 7 2016 Weak high pressure visits today.
1100 AM EST Wed Dec 7 2016 Building high pressure should maintain dry weather today. A Thursday cold front will bring much colder temperatures and snow shower chances to end the work week. Building high pressure should maintain partly cloudy skies across the area this afternoon. Very little moisture exists along the mid-level cold front, so initial precipitation chances will be minimal through Thursday afternoon, but a slight wind shift will bring lake-effect and upslope snow that could extend into the early weekend. Although cold advection will be ongoing, the coldest air will pour in later Thursday afternoon with a mid-level trough. Veering winds behind the trough axis will seep Great Lakes moisture in across the northern 1/3 of the forecast area, eventually extending southward into the Ridges.
This low will continue to track slowly eastward. Forecast will remain in the windy zone west of the low as mixing up through 900 mb should continue where winds are 40-45 kt range. Moisture is still wrapping around the low and mostly into the northeastern half of the fcst area. Overall though lack of intense snow in the high wind area is allowing for improving visibilities to just above blizzard range in most areas and to match up with WFO BIS will expire blizzard warning at 12z.
The axis of the trough was just reaching the Continental Divide at 10Z, but a weaker secondary wave combined with divergence on the nose of a 120 knot jet sustained snowfall. With the main trough east of the forecast area by 12Z, subsidence and drying begin. Expect snow showers to diminish early this evening as mid-level warm air advection (WAA) stabilizes the drier post-trough environment. However, clouds will be increasing during the day as moisture tops the ridge to the west. EC and GFS both indicated mid-level moisture may be sufficient for some light snowfall over the northern and central mountains but only bringing up to an inch across the higher peaks and ridges.
Broad upper trough will dominate as we go through the remainder of the work week and into the weekend. Surface wave down along Gulf Coast will try and wave up tonight in response to short wave energy racing through upper trough but don't think it will be enough to crank up precip this far north but there is enough vorticity rounding base of upper trough tonight in tight geostropic flow to warrant at least a mention of a 15 percent pop for a sprinkle or flurry or two in the overnight.
The deep upper low over Minnesota/Quebec along with the accompanying expansive polar jet is responsible for pushing the Arctic front towards the Southeast over the next 24 hours. Some breaking in the clouds is possible over northeast AL/N GA area before the Arctic cold front approaches for tonight. Then, as the cold front approaches northeast to north winds will increase and gradually back to the northwest with frontal passage between 04Z-06Z (10PM-1AM) tonight. Not much saturation is present for long in the low-levels, but may still see some light rain prior to the frontal passage this evening. Northwest winds will also increase especially over the higher elevations of northeast AL where wind speeds to 15-20 MPH winds will be possible. Temperatures will not rise much from Thursday morning with daytime highs forecast to be in the low 40s.
600 AM EST Wed Dec 7 2016 A strong low pressure system over southern Ontario will move slowly east across southeast Canada over the next couple of days causing cold conditions across our area.
414 AM CST Wed Dec 7 2016 A vertically stacked area of low pressure will continue to move through the region this morning, and eventually translate to the east later today into tonight. Winds will slowly veer to the northwest through the day Wednesday as the low pressure moves away and should remain gusty as a tight sfc pressure gradient persists. Thanks to the cyclonic flow aloft, and cold temperatures in the low levels, scattered snow showers should remain over the Northland on Thursday morning.
645 AM EST Wed Dec 7 2016 High pressure will extend east across the area today and tonight.
1021 AM EST Wed Dec 7 2016 High pressure builds into the area today. A cold front will move through Thursday.
Satellite imagery and surface observations continue to show a solid deck of low stratus extending across our region, keeping early morning temperatures a little warmer than expected, with readings in the lower to mid 50s as of 3 A. The low stratus deck is expected to hold strong this morning, and may linger into the afternoon though there could be some breaks of sun. High temperatures today should only reach the lower to mid 60s over most places, except in the upper 50s to around 60 across locations generally north of the U. Lows tonight remain cool, with readings in the lower to mid 40s over interior areas and upper 40s to lower 50s closer to the coast and beaches.
Current temperatures range from the single digits to 20s in the mountains with mainly 30s across the lower elevations (the east side of the Sacramento Valley is in the upper 20s and lower 30s).
Some very light freezing drizzle and flurries will be possible this morning across the central and eastern Oklahoma Panhandle and the far northeast Texas Panhandle initially behind the front. Some brief periods of flurries and very light freezing drizzle will be possible south of the Canadian River during the evening hours tonight, but flurries will be the main precip type after midnight as the cold air deepens across the southern Texas Panhandle.
545 AM EST Wed Dec 7 2016 Low pressure north of the great lakes region will move northeast through tonight.
355 AM MST Wed Dec 7 2016 Upper level analysis has large trof over most of the CONUS with closed low over northern MN. Frigid air will continue to push into the area as Arctic high pressure settles into the Northern Plains. Lows late tonight will plummet well below zero in most locations as Arctic high pressure center slides into western portions of the area. Arctic high pressure moves across the Dakotas on Thursday.
715 AM EST Wed Dec 7 2016 A weak trough will move across the region today.
416 AM CST Wed Dec 7 2016 We will remain under cyclonic flow owing to the large low pressure system departing to our northeast through the next 24 hours. The best chance of any accumulation will be tonight across mainly central MN through west central WI as a subtle secondary trough works through the area immersed in the parent deep cyclonic flow.
Surface analysis depicts a cold front now well to the east of the FA with high pressure continuing to build in behind. Meanwhile, 09z H5 analysis reveals southwest flow aloft over the region as an upper level trough associated with a potent upper low currently situated over northern Minnesota amplifies over the leeward Rocky Mountains. By late Wednesday a reinforcing cold front will be to the west of the FA.
An mvfr layer remains in place this morning behind a cold front and this layer may not entirely break until mid day at the terminals with scattered to broken alto cu above building in ahead of the next weak upper level system.
637 AM EST Wed Dec 7 2016 As upper level low pressure moves east across Ontario and Quebec, cooler and drier air will continue to move into the Ohio Valley today, with temperatures continuing to get colder through the end of the week.
SHORT TERM (Today through Thursday): The challenge for today will be what impact on temperatures will the initial cold front currently moving through the RGV as of this writing. As for today, the passage of the front and the gradual thickening of the low clouds as south winds between 925-850mb overrun the shallow northeast surface winds today's temperatures will likely have a difficult time reaching expected previous forecast and the latest guidance Maximums. Rain chances albeit light might also see a better chance as the clouds begin to thicken and the overrunning strengthens as a coastal trough develops later in the afternoon.
940 AM EST Wed Dec 7 2016 Weak high pressure will settle over the Carolinas today. An arctic cold front will move through the area Thursday. High pressure will settle over the area today between a low departing tot he northeast and an arctic cold front moving through the Midwest. Skies will remain clear for most of the day in most areas, but some of the low-level moisture in the Coastal Plain may result in scattered cur this afternoon, while abundant moisture over SC will inevitably return north across the western Piedmont this evening as the flow veers to southerly ahead of the cold front.
925 AM EST Wed Dec 7 2016 Weak cold front extends across south FL this morning. EC FL a little cooler versus 24 hours ago but still above normal for early Dec.
Some of the typical colder valleys including Polebridge, Seeley/Swan Valley and Clearwater Junction could face overnight lows of 15-20 degrees below zero. Right now we're expecting ONE TO TWO FEET of snow throughout the higher terrain of the Clearwater and Bitterroot Mountains along the Montana/Idaho border, with locally higher amounts quite possible.
530 AM CST Wed Dec 7 2016 A deep upper level low currently over the MN/Ontario border is forecast to continue to track northeast while upstream, a broad upper level trough over the intermountain west and northern Rockies is forecast to dig into the nation's mid-section. The northern edge will quickly be eroded as dry high pressure builds southeast.
The increased cloud cover will lead to the high temps begin a few degrees cooler than expected.
There is the potential for a wintry mix of light sleet, light snow, and even freezing light freezing rain late tonight as an upper level trough approaches and mid levels of the atmosphere saturate. Surface temperatures along the I-10 corridor may not fall below freezing until after sunrise. Highs today will range from the lower 50s in the Big Country to around 60 in the Concho Vally southward to Ozona.
Cold dry weather will continue today under northwest flow aloft with cold air at the surface left over from an upper level trough which has move east of the Rockies.
Temperatures today will remain below freezing as colder air settles into eastern WA and OR. Skies will remain clear to partly cloudy today under ridging aloft. With cold air in place at the surface the warm front will spread snow across the area Thursday.
Drier and cooler conditions are expected today however the active pattern will resume on Thursday.
557 AM CST Wed Dec 7 2016 We will remain under cyclonic flow owing to the large low pressure system departing to our northeast through the next 24 hours. The best chance of any accumulation will be tonight across mainly central MN through west central WI as a subtle secondary trough works through the area immersed in the parent deep cyclonic flow.
626 AM EST Wed Dec 7 2016 Weak high pressure will settle over the Carolinas today. An arctic cold front will move through the area Thursday. Broad troughiness over the Central US, associated with the mid-level low traversing eastward across southern/southeastern Canada, will shift eastward into the eastern US by late Thursday. Continued energetic SWLY flow aloft with weak high pressure at the surface, will mean central NC will see a brief return of sunshine today. Despite neutral temp advection over the past 24 hours, this sunshine will result in warmer temperatures this afternoon. Clouds will begin to increase late this afternoon and through the evening with the approach of the upper trough and resultant shallow southerly moist upglide ahead of an Arctic cold front moving into the area from the west.
Cooler temperatures and locally breezy north winds can be expected today with periods of high clouds.
Scattered areas of light snow and/or freezing drizzle will be possible behind strong cold front this afternoon into the evening hours across NE OK/NW AR. At most would expect a brief period of very light snow which could lead to some very light accumulations over parts of northeast OK and northwest AR, but precip could well be limited to flurries or freezing drizzle in many areas.
645 AM EST Wed Dec 7 2016 Weak high pressure visits today.
219 AM EDT MON APR 25 2016 AN UPPER LEVEL RIDGE ACROSS THE AREA TONIGHT WILL PROVIDE DRY CONDITIONS AND MILD TEMPERATURES. A COLD FRONT WILL MOVE INTO OUR AREA TONIGHT WITH A GOOD CHANCE FOR THUNDERSTORMS. DIURNAL IMPACTS COULD HAMPER COVERAGE/INTENSITY ACROSS THE AREA UNLESS A WELL DEFINED LINE DEVELOPS TO THE WEST OR FRONT/PRE-FRONTAL TROUGH IS QUICKER TO ARRIVE. HIGH PRESSURE WILL BUILD IN FROM THE NORTH AND GIVE A BRIEF REPRIEVE.
408 AM EDT MON APR 25 2016 HIGH PRESSURE WILL PREVAIL THROUGH MID WEEK.
1133 PM MDT SUN APR 24 2016 THE UPPER LOW CURRENTLY OVER FAR EASTERN WYOMING. FAR NORTHWEST NEBRASKA AND FAR SOUTHWEST SOUTH DAKOTA WILL BE TRACKING ALONG THE NEBRASKA/SOUTH DAKOTA BORDER OVERNIGHT WITH SHORT WAVE RIDGING EXPECTED OVER THE CENTRAL HIGH PLAINS REGION OVERNIGHT AND INTO EARLY MONDAY AHEAD OF THE NEXT UPPER LOW PRESSURE SYSTEM MOVING INTO THE INTERMOUNTAIN WEST BY LATE MONDAY.
PERSISTENT UPPER LEVEL TROUGHING WILL KEEP SHOWERS GOING THROUGH THE PERIOD. WEAK TROUGHING COMES IN FROM THE NORTH. AND HAVE KEPT THE HIGH POPS FOR THE AFTERNOON AND OVERNIGHT HOURS.
SHOWERS CONTINUE TO DIMINISH RAPIDLY AS AN UPPER LOW MOVES OFF TO THE EAST, AND THEY HAVE BEEN REMOVED FROM ALL TAFS. BUT SHOWERS AND CLOUDS GRADUALLY DECREASING FROM WEST TO EAST OVERNIGHT AS AN UPPER LOW MOVES EAST AND AWAY FROM THE AREA.
344 AM EDT MON APR 25 2016 FINALLY BEGINNING TO SEE SOME CIRRUS PUSH INTO EASTERN KENTUCKY COURTESY OF A STACKED LOW PRESSURE SYSTEM MOVING FROM THE NORTHERN AND CENTRAL GREAT PLAINS INTO THE UPPER MIDWEST. WARMER AIR WILL CONTINUE TO BE ADVECTED SOUTH AND EAST OF THIS FEATURE. THUS ALLOWING DAYTIME HIGHS TO REACH THE LOW-MID 80S TODAY. THE PERIOD WILL BEGIN WITH COLD FRONT SAGGING SOUTH AND THUNDERSTORMS WILL BE ON GOING INTO TUESDAY NIGHT.
SOUTHERLY FLOW IS FORECAST TO PREVAIL THROUGH MONDAY ON THE MOIST AND WARMER SECTOR OF A DRYLINE THAT EXTENDS FROM NORTH CENTRAL TEXAS TO THE DEEP SOUTH. UPPER AIR ANALYSIS THIS MORNING SHOWED A TROUGH ENTERING SOUTH TEXAS EXTENDING FROM A LOW OVER WYOMING. THERE WAS A SURFACE REFLECTION OF THE TROUGH ALONG THE GULF COAST AND A STATIONARY FRONT IN THE TEXAS PANHANDLE. THE UPPER PATTERN WILL SHIFT TO THE EAST TONIGHT AND MONDAY BRINGING A RIDGE OVER TEXAS WHILE ANOTHER TROUGH MOVES INTO THE WEST. MONDAY NIGHT THE WESTERN UPPER TROUGH WILL MOVE INTO THE ROCKIES AND TURN THE FLOW OVER TEXAS TO THE SOUTHWEST. THE SOUTHERLY FLOW WILL BRING WARMER AIR AND TEMPERATURES WILL BE ABOVE NORMAL.
Tuesday will be different as an upper level low moves into the Central Plains. The jet stream wrapping around the southern periphery of the low will be favorably positioned to bring stronger and more widespread winds to the Guadalupe Mountains and thus have continued the High Wind Watch. Some of these winds will mix into the lower elevations in southeastern New Mexico and an advisory may be needed for this area in the next 24 to 36 hours. Models were originally developing a dryline in the central Permian Basin on Tuesday with the low developing storms in the eastern Permian Basin.
THE UPPER LOW OVER ERN SD WILL DEAMPLIFY AS IT MOVES INTO NW WI LATER TODAY AND REACHES NRN LOWER MI LATE TNT. THE WARM FRONT WILL MOVE TO CENTRAL WI WITH 70 TEMPS AND UPPER 50S DEWPOINTS CONTRIBUTING TO MLCAPE OF 500-1000 J/KG OVER SRN WI. THE CONVECTION IS FORMING WITHIN THE 850-700 MB THERMAL RIDGE. WHILE IT WILL BE MORE WIDESPREAD TOWARD CENTRAL WI WHERE LOW LEVEL FRONTOGENESIS IS FOCUSED AT THE WARM FRONT.
305 AM EDT MON APR 25 2016 WEAK HIGH PRESSURE TODAY.
A low-level anticyclone that dominated the regional weather pattern this weekend will become increasingly positioned off the Atlantic coast today, setting up some return flow on the western periphery of the area of high pressure. While these layers are not forecast to be saturated, or have a lot of depth to the moisture, there should still be enough moisture present to lead to some scattered rain showers in the presence of the low-level ascent. Given the expectations for more cloud cover (and rain) than this weekend, high temperatures are forecast to be slightly cooler.
652 AM EDT MON APR 25 2016 LOW PRESSURE OVER THE UPPER MIDWEST WILL PUSH EAST AND SPREAD RAIN ACROSS THE AREA LATER TODAY AND ON TUESDAY. A COLD FRONT WILL DROP INTO THE AREA FROM CANADA LATER ON TUESDAY BRINGING DRIER AND COOLER AIR. DVLPG SFC TROF OVER NRN PA WILL BE THE FOCUS FOR MORE CONV PCPN. WITH COOLER AIR DROPPING TEMPS BLO NRML THU MRNG.
HIGH PRESSURE WILL MOVE FURTHER OFFSHORE THROUGH TUESDAY. A COLD FRONT WILL CROSS THE AREA TUESDAY EVENING.
UPPER LEVEL TROUGH WILL CONTINUE MOVING ACROSS THE REGION TONIGHT INTO MONDAY. UPPER RIDGE BUILDING INTO THE AREA MONDAY NIGHT WITH CLEARING SKIES AND COLD TEMPERATURES. THE RIDGE AXIS WILL OVER THE REGION TUESDAY WITH MOSTLY SUNNY SKIES. AN UPPER TROUGH WILL CONTINUE TO DIG SOUTH-SOUTHEAST ACROSS THE PACIFIC NORTHWEST INTO THE GREAT BASIN TONIGHT. COLD AIR ALOFT ASSOCIATED WITH THIS TROUGH WILL CONTINUE TO CAUSE ISOLATED TO SCATTERED SHOWERS OVER PORTIONS OF THE AREA INTO THE EVENING. THESE SHOWERS WILL MAINLY BE OVER THE HIGHER TERRAIN. THE UPPER TROUGH WILL DEVELOP INTO A CUT OFF LOW OVER THE GREAT BASIN MONDAY, THEN SLOWLY DRIFT EAST TO COLORADO THROUGH TUESDAY.
1033 PM PDT SUN APR 24 2016 The threat of showers will begin to diminish after this evening as a low pressure area dives well south of the region replaced by weak high pressure. There are some light returns on regional radar mosaic to our west that may reach the Cascade crest overnight but the bulk of the precip will remain to our southwest as the main upper low drops south into California and Nevada. Clearing skies will lead to cooler overnight temperatures with the sheltered northern valleys could dip below freezing.
410 AM EDT MON APR 25 2016 AN UPPER LEVEL RIDGE ACROSS THE AREA TONIGHT WILL PROVIDE DRY CONDITIONS AND MILD TEMPERATURES. A COLD FRONT WILL MOVE INTO OUR AREA TONIGHT WITH A GOOD CHANCE FOR THUNDERSTORMS. THERE IS A MUCH BETTER CHANCE FOR SHOWERS AND STORMS TONIGHT AS LOW LEVEL MOISTURE SURGES NORTHEAST AHEAD OF A COLD FRONT.
149 AM EDT MON APR 25 2016 WEAK HIGH PRESSURE TODAY. COLD FRONT APPROACHES TONIGHT BRINGING CHANCES FOR SHOWERS/STORMS.
151 AM EDT MON APR 25 2016 A WARM FRONT WILL LIFT NORTHWARD ACROSS LAKE ERIE TONIGHT BEFORE STALLING OVER SOUTHERN ONTARIO. LOW PRESSURE WILL TRACK ALONG THIS BOUNDARY MONDAY INTO TUESDAY REACHING THE NJ COAST BY TUESDAY AFTERNOON.
356 AM EDT MON APR 25 2016 HIGH PRESSURE WILL MOVE OFF THE EAST COAST ON MONDAY AS A BOUNDARY SETS UP ALONG THE NEW YORK BORDER. LOW PRESSURE WILL TRACK ALONG THE BOUNDARY ON TUESDAY. PUSHING IT SOUTHWARD ACROSS THE STATE AS A COLD FRONT. HIGH PRESSURE WILL THEN BUILD OVER THE REGION FOR MIDWEEK. A LOW TRACKING SE ACROSS NY STATE ON TUE WILL PULL A COLD FRONT ACROSS THE REGION ON TUE. LOOKING AT THE POTENTIAL FOR A TENDENCY TO LEAN TOWARD A WETTER AND COOLER PATTERN.
WITH RIDGE/VALLEY SPLIT STILL INTACT. HIGH PRESSURE AT THE SURFACE AND ALOFT IS PROVIDING FOR A VERY PLEASANT DAY ACROSS THE OHIO AND TENNESSEE VALLEYS. HIGH PRESSURE WILL GRADUALLY LOSE ITS GRIP ACROSS THE REGION OVER THE NEXT 36 HOURS. AS AN UPPER LEVEL SHORT WAVE TROUGH TRAVELS FROM THE ROCKIES TO THE GREAT LAKES BY MONDAY NIGHT. ALLOWING A COLD FRONT TO DROP SOUTHEAST INTO THE OHIO VALLEY. RIDGETOPS WILL STAY SOME 10 DEGREES MILDER. PARTLY SUNNY SKIES AND GUSTIER SOUTHWEST WINDS WILL ALLOW TEMPERATURES TO REBOUND INTO THE LOW TO MID 80S ON MONDAY.
512 AM EDT MON APR 25 2016 WEAK HIGH PRESSURE TODAY.
UPPER LOW OVER SOUTHERN NEVADA DOMINATES THE WEATHER OVER THE REGION. MOISTURE ROTATING NORTH AND WEST AROUND THIS LOW IS SPILLING INTO SOUTHERN IDAHO AND SOUTHERN OREGON. CONDITIONS IMPROVE THIS EVENING AS THE LOW OVER NEVADA MOVES SLOWLY EASTWARD.
154 AM EDT MON APR 25 2016 DRY HIGH PRESSURE WILL REMAIN IN PLACE ALONG THE CAROLINA COAST TODAY AND SLOWLY SHIFT EAST OFFSHORE TUESDAY.