Aikyam-Lab/Synoptic-Bench huggingface dataset:
WATER VAPOR LOOP SHOWS A RIDGE ALONG THE WEST COAST. A WAVE TRAIN CONTINUES TO CROSS THE PACIFIC AND RIDE ATOP THE RIDGE. AMDAR 400-250MB WIND OBSERVATIONS INDICATE A 90-115KT ANTICYCLONIC JET FROM THE PACIFIC NORTHWEST INTO THE HIGH PLAINS. BUMPED UP WINDS IN THE HIGHER TERRAIN TO BETTER REFLECT OBSERVATIONS DURING THE PAST 24 HOURS. A LOW AMPLITUDE RIDGE REMAINS ALONG THE WEST COAST THIS AFTN WITH MOISTURE CONTINUING TO STREAM THROUGH THE RIDGE AND ACROSS THE NRN CWA. THE NEXT WEAK WAVE COMING OVER THE RIDGE IS FORECAST FOR TONIGHT INTO TUE MORNING WITH YET ANOTHER WAVE SCHEDULED FOR TUE NIGHT INTO WED. THE RIDGE ADVANCES FAR ENOUGH EAST BY WED AFTN TO SHUNT PRECIP OFF TO THE EAST WITH RIDGING BRINGING DRYING AND WARMING FOR THU INTO FRI. THE NORTHEASTERN VALLEYS WILL STAY A LITTLE COOLER.
HIGH PRESSURE ALOFT WILL PERSIST THROUGH MID WEEK RESULTING IN DRY WEATHER AND SLIGHTLY ABOVE NORMAL TEMPERATURES.
TEMPS WERE HOLDING STEADY IN THE LOWER TO MID 30S. EXPECT THE LOW CLOUDS TO SLOWLY WEAKEN/DISSIPATE ACROSS THE TENNESSEE VALLEY REGION TONIGHT. AS HIGH PRESSURE AT THE SURFACE AND ALOFT CONTINUES TO BUILD EASTWARD INTO THE AREA. HAVE TRENDED CLOSER TO THE SLIGHTLY WARMER NAM TEMP GUIDANCE FOR TONIGHT'S OVERNIGHT LOWS. THE HIGH PRESSURE RIDGE AXIS WILL QUICKLY MOVE EAST OF THE FORECAST AREA BY EARLY TUESDAY. WITH A SOUTHERLY FLOW SETTING UP IN THE LOWER LEVELS DURING THE DAY ON TUESDAY.
/ISSUED 355 PM CST MON FEB 2 2015/ STRONG CANADIAN SFC RIDGING REMAINS ANCHORED OVER THE SRN PLAINS AND MID MS VALLEY REGION THIS AFTERNOON. VERY DRY AIR AT THE SFC AND DECOUPLING WINDS SHOULD ALLOW FOR TEMPS TO FALL QUICKLY TO/BELOW FREEZING OVER MUCH OF THE REGION BY MID-EVENING. ALTHOUGH THE INCREASING ELEVATED MOISTURE WELL AHEAD OF THE SRN BAJA CLOSED LOW MAY HELP SLOW THE TEMP FALL OVER THE SRN ZONES. ABOUT 5-10 DEGREES WARMER THAN THIS AFTERNOON.
623 PM EST MON FEB 2 2015 DRY AND COLD WEATHER WILL MOVE IN TONIGHT UNDER HIGH PRESSURE.
UPPER LEVEL LOW MOVING INTO OLD NORTHERN MEXICO WILL KEEP A STREAM OF UPPER TO MID LEVEL CLOUDINESS MOVING ACROSS THE REGION DURING THE TAF PERIOD. A LIGHT FREEZE WILL BE POSSIBLE OVER MUCH OF THE AREA TONIGHT AS HIGH PRESSURE BUILDS IN FROM THE NORTH TEXAS AND WINDS DIMINISH.
WINDS HAVE DIMINISHED AND FREEZING TEMPS ARE ALREADY NOTED SOUTH OF ATLANTA.
THE 500 MB CLOSED LOW TO OUR WEST OVER NORTHWEST AND NORTH CENTRAL MEXICO WILL PUSH STEADILY EAST THROUGH THE NIGHT AND INTO TUES. COASTAL TROUGH BEGINNING TO TAKE SHAPE OFFSHORE IN THE WAKE OF THE COLD FRONT LAST NIGHT. WHILE THE LARGE H5 TROUGH BEGIN TO RACE ACROSS NORTHERN MEXICO. THE H5 TROUGH IS POURING MOISTURE INTO THE REGION FROM THE SOUTHWEST. SOME DIVERGENCE NOTED ALOFT AHEAD OF THE TROUGH WILL BUILD SOME MORE SHOWERY TYPE PRECIPITATION OVERNIGHT. WITH TROUGH WILL BE JUST PASSING THE REGION.
JUST SOME HIGH CIRRUS CLOUDS ARE EXPECTED FROM THE UPPER LOW OVER MEXICO WITH ALL RAIN REMAINING SOUTH OF THE REGION. TEMPERATURES FELL BELOW FREEZING THROUGHOUT THE ENTIRE CWA. AN UPPER LOW CURRENTLY OVER SOUTHERN BAJA WILL MOVE TOWARD SOUTH TEXAS ON TUESDAY.
913 PM CST MON FEB 2 2015 THE UPPER LEVEL LOW NEAR THE BAJA WILL CONTINUE TO SHEAR OUT AS THE UPPER TROUGH MOVES TOWARD THE STATE TONIGHT. WATER VAPOR IMAGERY SHOWS UPPER LOW OVER CABO SAN LUCUS MEXICO WITH HIGH CLOUDS MOVING OVER THE REGION. UPPER LOW SHOULD EDGE CLOSER WITH A COASTAL TROUGH DEVELOPING TOMORROW.
TEMPS HAVE ALREADY QUICKLY DROPPED TO NEAR OR BELOW FREEZING ACROSS MUCH OF THE AREA AS WEAK COLD ADVECTION CONTINUES.
VERY QUIET EVENING IN THE WEATHER DEPARTMENT ACROSS SOUTHEAST ARIZONA AS A RIDGE OF HIGH PRESSURE BUILDS IN ALOFT. THERE ARE SOME CIRROFORM CLOUDINESS NEAR THE INTERNATIONAL BORDER AND A MORE EXTENSIVE AREA NOW ACROSS THE LOWER COLORADO RIVER VALLEY INTO SOUTHEAST CALIFORNIA MOVING TOWARDS THE AREA. WITH HIGH PRESSURE DOMINATING OUR WEATHER. HIGH PRESSURE WILL BUILD ACROSS THE DESERT SOUTHWEST THROUGH THE WEEK. WITH DRY CONDITIONS AND WARMER TEMPERATURES.
902 PM EST MON FEB 2 2015 COLD FRONT CROSSING EXTREME SOUTH FLORIDA THIS EVENING, AND HAS CLEARED NAPLES AS THE DEWPOINT HAS FALLEN FROM 66F AT 6PM TO A CURRENT 50F. /ISSUED 627 PM EST MON FEB 2 2015/ BRIEF MVFR CIGS AT KAPF THIS EVENING AS COLD FRONT ADVANCES ACROSS SOUTH FLORIDA, THEN VFR AT ALL TERMINALS THE REMAINDER OF THE FORECAST WITH BKN035-040 ALONG THE EAST COAST AS WIND VEERS TO THE NORTHEAST LATE IN THE PERIOD. /ISSUED 346 PM EST MON FEB 2 2015/ LEADING EDGE OF A COLD FRONT IS CURRENTLY PASSING THROUGH THE TAMPA AREA WITH A MEAGER LINE OF MODERATE SHOWERS. NORTHERLY FLOW BEHIND THE FRONT SHOULD BE BRIEF AS THE SUCCESSIVE HIGH PRESSURE BUILDS EASTWARD TURNING SURFACE WINDS MORE NORTHEASTERLY.
1008 PM EST MON FEB 2 2015 HIGH PRESSURE ALONG WITH DRY AIR WILL REMAIN IN CONTROL THROUGH TUESDAY.
627 PM EST MON FEB 2 2015 BRIEF MVFR CIGS AT KAPF THIS EVENING AS COLD FRONT ADVANCES ACROSS SOUTH FLORIDA, THEN VFR AT ALL TERMINALS THE REMAINDER OF THE FORECAST WITH BKN035-040 ALONG THE EAST COAST AS WIND VEERS TO THE NORTHEAST LATE IN THE PERIOD. /ISSUED 346 PM EST MON FEB 2 2015/ LEADING EDGE OF A COLD FRONT IS CURRENTLY PASSING THROUGH THE TAMPA AREA WITH A MEAGER LINE OF MODERATE SHOWERS. NORTHERLY FLOW BEHIND THE FRONT SHOULD BE BRIEF AS THE SUCCESSIVE HIGH PRESSURE BUILDS EASTWARD TURNING SURFACE WINDS MORE NORTHEASTERLY.
A FEW LIGHT SNOW SHOWERS OR FLURRIES WILL LINGER OVER THE EAST TN MOUNTAINS TONIGHT AS A COLD FRONT CONTINUES TO PULL AWAY FROM THE REGION. CHATTANOOGA AIRPORT, TN 25 49 30 54 / 0 0 0 10 KNOXVILLE MCGHEE TYSON AIRPORT, TN 22 45 28 53 / 10 0 0 10 OAK RIDGE, TN 24 46 29 52 / 0 0 0 10 TRI CITIES AIRPORT, TN 19 43 23 50 / 10 0 0 10.
THE HIGH TO OUR WEST AND DRIER AIR FILTERING IN FROM THE NORTH WAS PRODUCING A SLOW EROSION OF THE ABOVE NOTED STRATUS DECK. WITH HIGH PRESSURE AND LIGHT WINDS. OVERNIGHT LOWS SHOULD COOL INTO THE LOWER 20S. TEMPS WERE HOLDING STEADY IN THE LOWER TO MID 30S. EXPECT THE LOW CLOUDS TO SLOWLY WEAKEN/DISSIPATE ACROSS THE TENNESSEE VALLEY REGION TONIGHT. AS HIGH PRESSURE AT THE SURFACE AND ALOFT CONTINUES TO BUILD EASTWARD INTO THE AREA. HAVE TRENDED CLOSER TO THE SLIGHTLY WARMER NAM TEMP GUIDANCE FOR TONIGHT'S OVERNIGHT LOWS. THE HIGH PRESSURE RIDGE AXIS WILL QUICKLY MOVE EAST OF THE FORECAST AREA BY EARLY TUESDAY. WITH A SOUTHERLY FLOW SETTING UP IN THE LOWER LEVELS DURING THE DAY ON TUESDAY.
WE ARE IN FOR A COLD NIGHT WITH HIGH PRESSURE EXPECTED TO SETTLE IN QUICKLY ACROSS THE REGION ON THE HEELS OF COLD ADVECTION.
HIGH PRESSURE WILL DOMINATE WEATHER OVER NORTHERN ARIZONA THIS WEEK. DRY CONDITIONS AND MUCH WARMER THAN NORMAL HIGH TEMPERATURES ARE EXPECTED.
1057 PM EST MON FEB 2 2015 HIGH PRESSURE WILL SLIDE INTO THE MID-ATLANTIC STATES TONIGHT AND TUESDAY.
WATER VAPOR IMAGERY SHOWS UPPER LOW OVER CABO SAN LUCUS MEXICO WITH HIGH CLOUDS MOVING OVER THE REGION. UPPER LOW SHOULD EDGE CLOSER WITH A COASTAL TROUGH DEVELOPING TOMORROW.
ISSUED BY NATIONAL WEATHER SERVICE WAKEFIELD VA 646 PM EST MON FEB 2 2015 A COLD FRONT WILL PUSH FARTHER OFFSHORE TONIGHT INTO TUESDAY AS HIGH PRESSURE BUILDS IN FROM THE WEST.
A LOW AMPLITUDE RIDGE REMAINS ALONG THE WEST COAST THIS AFTN WITH MOISTURE CONTINUING TO STREAM THROUGH THE RIDGE AND ACROSS THE NRN CWA. THE NEXT WEAK WAVE COMING OVER THE RIDGE IS FORECAST FOR TONIGHT INTO TUE MORNING WITH YET ANOTHER WAVE SCHEDULED FOR TUE NIGHT INTO WED. THE RIDGE ADVANCES FAR ENOUGH EAST BY WED AFTN TO SHUNT PRECIP OFF TO THE EAST WITH RIDGING BRINGING DRYING AND WARMING FOR THU INTO FRI. THE NORTHEASTERN VALLEYS WILL STAY A LITTLE COOLER.
AFTER MIDNIGHT THE NEXT TROUGH WILL BEGIN AFFECTING THE AREA. THEN ANOTHER TROUGH WILL CAUSE AN INCREASE IN SNOWFALL AFTER ABOUT 03Z TUE EVENING AND CONTINUE OVERNIGHT. THIS SECOND TROUGH IS A BIT STRONGER SO ACCUMULATIONS SHOULD BE HIGHER.
A REMNANT WARM FRONTAL BOUNDARY WILL BE DRAPED ACROSS SOUTHERN OREGON TONIGHT AND TUESDAY MORNING THEN GRADUALLY SHIFT NORTH TUESDAY AFTERNOON AND TUESDAY NIGHT.
ALREADY BELOW FREEZING AREA WIDE. 1028 MB HIGH PRESSURE SYSTEM IS MOVING OVER THE MIDSOUTH AND WINDS ARE GRADUALLY DIMINISHING FROM WEST TO EAST. TO THE LOWER TO MID 30S ELSW. CLOUDS WILL CONTINUE TO ERODE THIS EVENING AS HIGH PRESSURE PUSHES DIRECTLY OVERHEAD. HIGH PRESSURE WILL SHIFT EAST TUESDAY AND TUESDAY NIGHT AND WINDS WILL SHIFT AROUND TO THE SOUTHWEST.
HIGH PRESSURE ON THE SURFACE CONTINUED TO EXTEND SOUTHWEST INTO THE FOUR STATE REGION AND WILL PROVIDE FOR A COLD NIGHT. CLOUD COVER OVER THE SOUTH AND SOUTHEAST ZONES ON TUESDAY WILL ALSO KEEP READINGS A LITTLE COOLER INTO THE DAY AS WELL. /ISSUED 355 PM CST MON FEB 2 2015/ STRONG CANADIAN SFC RIDGING REMAINS ANCHORED OVER THE SRN PLAINS AND MID MS VALLEY REGION THIS AFTERNOON. VERY DRY AIR AT THE SFC AND DECOUPLING WINDS SHOULD ALLOW FOR TEMPS TO FALL QUICKLY TO/BELOW FREEZING OVER MUCH OF THE REGION BY MID-EVENING. ALTHOUGH THE INCREASING ELEVATED MOISTURE WELL AHEAD OF THE SRN BAJA CLOSED LOW MAY HELP SLOW THE TEMP FALL OVER THE SRN ZONES. ABOUT 5-10 DEGREES WARMER THAN THIS AFTERNOON.
THE DRY AIR MASS BEHIND THE COLD FRONT WILL REMAIN IN CONTROL THROUGH TUESDAY.
WINDS WILL BE LESS THAN 10 KTS THROUGH THE PERIOD AS HIGH PRESSURE BUILDS IN.
AND WILL NOT DO MUCH MORE THAN PROVIDE US WITH THE CLOUD COVER WE SEE NOW THANKS TO DRY AIR IN THE LOW LEVELS. WHILE MAINLY SNOW-FREE AREAS THE NORTH WOULD RUN A GOOD 5-10 DEGREES WARMER.
No rain is expected tonight, but showers will be possible along the I-10 corridor Tuesday and Tuesday evening, as the upper-level cyclone over western Mexico finally moves across the region. Expect max temps on Tuesday to range from the lower 50s across the Hill Country to near 60 degrees across the Concho Valley and Big Country. /ISSUED 339 PM CST MON FEB 2 2015/ (Tonight and Tuesday) High clouds are spreading north across the southern portion of the forecast area this afternoon, in advance of an upper low that is currently located near the southern tip of the Baja peninsula. Most of the precipitation associated with the upper low will affect areas to our south and east on Tuesday. Southern counties will be mostly cloudy and cooler, with highs in the lower 50s.
HIGH PRESSURE WILL BUILD OVER THE REGION TONIGHT AND TUESDAY. HIGH PRESSURE CONTINUED TO BUILD INTO OUR REGION FROM THE WEST. ON THE COOLER END OF GUIDANCE.
Disturbance moving over flattening ridge will bring showers to areas north of Red Bluff Through Tuesday.
611 PM EST MON FEB 2 2015 HIGH PRESSURE WILL SLIDE INTO THE MID-ATLANTIC STATES.
644 PM EST MON FEB 2 2015 WINDY CONDITIONS HAVE BEGUN TO DIMINISH AND WILL BECOME LIGHT AND VARIABLE AROUND MIDNIGHT AS HIGH PRESSURE BUILDS INTO THE AREA. THE HIGH PRESSURE ALONG WITH DRY AIR WILL REMAIN IN CONTROL THROUGH TUESDAY.
/ISSUED 339 PM CST MON FEB 2 2015/ (Tonight and Tuesday) High clouds are spreading north across the southern portion of the forecast area this afternoon, in advance of an upper low that is currently located near the southern tip of the Baja peninsula. Most of the precipitation associated with the upper low will affect areas to our south and east on Tuesday. Southern counties will be mostly cloudy and cooler, with highs in the lower 50s.
710 PM EST MON FEB 2 2015 HIGH PRESSURE WILL SLIDE INTO THE MID-ATLANTIC STATES.
LOWERED TEMPERATURES AGAIN BASED ON OBSERVATIONS AND ADDED FREEZING FOR AFTER MIDNIGHT TO PORTIONS OF WEST TENNESSEE. ALREADY BELOW FREEZING AREA WIDE. 1028 MB HIGH PRESSURE SYSTEM IS MOVING OVER THE MIDSOUTH AND WINDS ARE GRADUALLY DIMINISHING FROM WEST TO EAST. TO THE LOWER TO MID 30S ELSW. CLOUDS WILL CONTINUE TO ERODE THIS EVENING AS HIGH PRESSURE PUSHES DIRECTLY OVERHEAD. HIGH PRESSURE WILL SHIFT EAST TUESDAY AND TUESDAY NIGHT AND WINDS WILL SHIFT AROUND TO THE SOUTHWEST.
918 PM EST MON FEB 2 2015 THE COLD FRONT HAS PUSHED SOUTH THROUGH THE AREA THIS EVENING AND COOLER AND DRIER HIGH PRESSURE IS BUILDING IN FROM THE NE. TEMPERATURES ARE EXPECTED TO APPROACH FREEZING TONIGHT OVER THE NORTHERN NATURE COAST. BUT WIDESPREAD FREEZING WITH 2 HOUR DURATIONS ARE NOT EXPECTED. WHICH WILL MAKE FEELS-LIKE TEMPERATURES FALL BELOW FREEZING FOR PORTIONS OF THE NATURE COAST. BEHIND A COLD FRONT.
With soil moisture fairly high from the rain last night to this morning and the temperatures dipping into the low 30s, patchy frost will be possible in the early morning hours tomorrow.
WITH LOW PRESSURE ALONG THE FRONT ACROSS FAR SOUTHEAST SD. UPPER LEVEL ANALYSIS CONTINUES TO SHOW LOW PRESSURE OVER HUDSON BAY. TEMPS RANGE FROM THE 20S ACROSS FAR NORTHWEST SD TO THE LOWER 40S ACROSS FAR SOUTHWEST SD.
THIS HIGH WAS PRODUCING SUNNY SKIES ACROSS THE UPPER MISSISSIPPI RIVER VALLEY. A WARM FRONT WAS LOCATED ACROSS THE CENTRAL DAKOTAS. TEMPERATURES WEST OF THIS FRONT RANGED FROM THE LOWER 60S THROUGH LOWER 80S. 12Z MODELS ARE IN VERY GOOD AGREEMENT THAT THIS WARM FRONT WILL MOVE QUICKLY ACROSS THE EASTERN DAKOTAS. AS THE WARM FRONT MOVES INTO THE DRY AIR ACROSS THE REGION. IT LOOKS LIKE THE AREAS ALONG AND WEST OF THE MISSISSIPPI RIVER WILL BE MAINLY ABOVE FREEZING. HOWEVER CANNOT RULE OUT A BRIEF PERIOD OF FREEZING RAIN COMPLETELY. THERE LOOKS TO BE A SLIGHTLY BETTER CHANCE OF FREEZING RAIN. MANY OF THE MESO MODELS SHOW THAT THE PRECIPITATION WILL BE A NARROW BAND AND THIS MAKES SENSE CONSIDERING THE NARROW BAND OF FRONTOGENESIS ALONG THE WARM FRONT. A COLD FRONT WILL MOVE QUICKLY SOUTHEAST ACROSS THE AREA.
404 PM CDT SAT MAR 28 2015 LATEST SURFACE ANALYSIS SHOWED A 1029MB HIGH OVER ILLINOIS WITH THE RIDGE AXIS SOUTH TO THE NORTH CENTRAL GULF. UPPER AIR ANALYSIS SHOWED THE MAIN TROUGH ALONG THE EAST COAST WITH NORTHWEST FLOW OVER MISSISSIPPI VALLEY. THE MAIN TROUGH AXIS ALONG THE EAST COAST WILL LIFT EAST AND ALLOW THICKNESS LAYERS TO INCREASE THROUGH THE REST OF THE WEEKEND.
316 PM CDT SAT MAR 28 2015 FORECAST CHALLENGES REVOLVE AROUND APPROACHING COLD FRONT AND ASSOCIATED PCPN/TYPE/PHASE. PREFRONTAL TROUGH SHOULD BE ALONG WESTERN/CENTRAL DAKOTAS BORDER AREA AROUND 00Z WITH COLD FRONT CATCHING UP LATER TONIGHT. COLD FRONT WILL THEN NEARLY BE THROUGH THE FA BY 12Z SUNDAY. AS COLUMN COOLS LATE TONIGHT THERE MAY BE A RAIN/SNOW MIX HOWEVER NO ACCUMS EXPECTED AS MINIMUM TEMPERATURES SHOULD FOR THE MOST PART BE AT OR ABOVE FREEZING. WINDS WILL DIMINISH SUNDAY NIGHT ALLOWING TEMPERATURES TO DROP CLOSE TO FREEZING.
WV imagery shows the upper ridge has moved east over the past 24 hours, and is roughly aligned w/the 4 Corners, in response to a trough over the ID Panhandle. Upper ridge will continue breaking down over the next 24 hrs as the trough on the U.
LARGE-SCALE PATTERN WILL EVOLVE FROM A TROUGH OVER THE EASTERN U. LATEST GUIDANCE SUGGESTS TEMPS IN SOME AREAS A DEGREE OR SO COOLER THAN PREVIOUS FORECAST.
An amplified yet progressive pattern at 500mb will feature a sharp trough that will move towards New England this evening, and a second trough moving east towards the Dakotas. For the Lower Ohio Valley, high pressure will slowly move southeast across eastern Kentucky this evening, before sliding southeast towards Georgia by Sunday afternoon. With good radiational cooling conditions, low temperatures will drop sharply this evening, bottoming out shortly after midnight in the lower to mid 20s.
329 PM EDT SAT MAR 28 2015 HIGH PRESSURE OVER THE GREAT LAKES WILL MOVE SOUTHEAST TONIGHT AND WILL BE CENTERED OVER THE MID ATLANTIC REGION SUNDAY.
SO HAVE EXPANDED THE HIGH WIND WARNING EAST TO ALSO COVER COUNTIES JUST EAST OF THE MO RIVER.
/ISSUED 330 AM CDT Sat Mar 28 2015/ (Today and tonight) Yesterday's back-door cold front stalled across the northeast half of the CWA and is currently lifting back north as a warm front. Winds will increase again overnight in the favored areas near and downstream of the higher terrain as the low-level jet intensifies. Expect overnight lows ranging from the low 50s along the I-10 corridor to near 60 degrees along Interstate 20.
302 PM CDT SAT MAR 28 2015 LOWS THIS MORNING DOWN IN THE LOW TO MIDDLE 20S WITH HARD FREEZE FELT ACROSS THE MID STATE. RIDGE WILL SHIFT EASTWARD NEXT 24 HOURS AND BE CENTERED OVER THE VIRGINIAS AND CAROLINAS. ALTHOUGH SOME CHANNEL FLOW IS EVIDENT THERE STILL REMAINS A GOOD SHOT OF POSITIVE VORTICITY NOSING DOWN THROUGH THIS SAME AREA ON BACKSIDE OF DEEP UPPER TROUGH. A COLD FRONT WILL ACCOMPANY THIS FEATURE ON SUNDAY AND EXTEND FROM WISCONSIN DOWN THROUGH EASTERN KANSAS INTO NORTH TEXAS BY 18Z SUNDAY.
HIGH PRESSURE OVER THE OHIO VALLEY TODAY WILL GRADUALLY BUILD SOUTHWARD. CONSENSUS WHICH IS TYPICAL IN COLD AIR ADVECTION PATTERNS WITH HIGH PRESSURE NOT CENTERED OVER THE AREA. SURFACE FLOW BECOMES MORE EAST TO SOUTHEAST SUNDAY NIGHT AS HIGH PRESSURE MOVES OFFSHORE.
DESPITE COLD FRONT PASSAGE. RETURN FLOW AND INCREASING LOW LEVEL MOISTURE WILL RESULT IN WARMER MINIMUMS MON NIGHT. -HOWERTON LIGHT EASTERLY WINDS WILL BECOME SOUTHEAST AND BEGIN TO INCREASE TONIGHT AS A TROUGH OF LOW PRESSURE DEVELOPS ACROSS THE HIGH PLAINS. THIS TROUGH WILL TRANSLATE EASTWARD ACROSS THE AREA EARLY ON SUNDAY ALLOWING WINDS TO VEER TO THE SOUTHWEST AND FINALLY SHIFT TO THE NORTHWEST AT 20-25 MPH WITH HIGHER GUSTS.
A COOL AIR MASS WILL BE IN PLACE ACROSS THE REGION OVERNIGHT WITH A STRONG TROUGH PARKED ALONG THE EASTERN SEABOARD.
/ISSUED 332 AM CDT SAT MAR 28 2015/ NORTH AND CENTRAL TEXAS REMAINS UNDER NORTHWEST FLOW ALOFT THIS MORNING AS A LARGE SCALE TROUGH RESIDES OVER THE EASTERN THIRD OF THE CONUS AND AN UPPER LEVEL RIDGE SITS OVER THE DESERT SOUTHWEST. AS THE TROUGH CONTINUES TO SLOWLY TRANSLATE EASTWARD AND THE RIDGE TO THE WEST BEGINS TO BREAK DOWN THIS WEEKEND.
AN UPPER LEVEL LONG WAVE TROUGH IS OVER THE EAST COAST WITH AN UPPER LEVEL RIDGE IN THE SW U. ALONG THE BACK SIDE OF THE TROUGH. EVEN THOUGH THE LOW LEVELS ARE DRIER. THERE IS ENOUGH MOISTURE AND IT IS ABOVE FREEZING IN THE SNOW GROWTH ZONE FOR A POSSIBLE FLURRY EARLY THIS AFTERNOON. TEMPERATURES ARE AND WILL BE ABOVE FREEZING AT THE SURFACE TODAY.
AS THE LOW LEVEL FLOW BECOMES MORE WESTERLY AND DIURNAL INSTABILITIES INCREASE THE BANDS OFF THE FINGER LAKES WILL LOSE STRUCTURE AND BECOME MORE CELLULAR THEN DIMINISH BY EARLY/MID AFTERNOON. TODAY, CAUGHT WITHIN AN ELONGATED TROF. STILL, THE POLAR AIR WILL USHER IN VERY COLD TEMPERATURES, WITH MAXES ONLY REACHING THE LOWER OR MIDDLE 20S IN INTERIOR SECTIONS OF THE SUSQUEHANNA REGION. BY LATE SUNDAY, THE HIGH WILL BE OFF THE SOUTH CAROLINA COAST, WITH A WEAK RETURN FLOW BRINGING MODERATION OF TEMPERATURES TO NY/PA.
DEWPOINTS WILL BE ON THE RISE BY LATE TONIGHT/SUNDAY AS SOUTHERLY FLOW STRENGTHENS AS A RESULT OF LEE SIDE TROFFING. CLOUDS WILL DISSIPATE AFTER 9 OR 10 AM SUNDAY FOR ANOTHER WARM DAY WITH HIGHS IN THE LOWER TO MID 80S ACROSS MOST AREAS WITH UPPER 80S OVER THE RIO GRANDE.
AND DECLINING ACROSS THE HIGH TERRAIN OF HARLAN AND LETCHER COUNTIES. BEFORE THE TROUGH AXIS SHOULD WORK EAST ENOUGH TO CUT THEM OFF. DEEP TROUGH AXIS IS WORKING ACROSS THE APPALACHIANS. SKIES WILL CLEAR OUT THROUGH THE DAY AS HIGH PRESSURE BUILDS IN. THE CENTER OF THE HIGH WILL BUILD IN OVERNIGHT TONIGHT. WHILE RIDGES STAY UP IN THE LOW 20S. THE HIGH WILL SHIFT SOUTHEAST OF THE AREA ON SUNDAY. AS A SHORT WAVE TROUGH MOVES INTO THE GREAT LAKES AND OHIO VALLEY REGIONS. HIGHS ON SUNDAY WILL REBOUND TO THE LOW AND MID 50S.
NEAR OR BELOW FREEZING TEMPERATURES EXPECTED LATE TONIGHT AND EARLY SUNDAY MORNING.
A WEAK FRONT HAS BEEN WASHING OUT OVER THE REGION THROUGH THE PAST DAY WHILE WEAK HIGH PRESSURE NUDGES IN FROM THE NORTH. THE RIDGE WILL CONTINUE TO MOVE INTO THE SE STATES THROUGH SUNDAY THEN MOVE OFF THE ATLANTIC COAST BY SUNDAY NIGHT.
122 PM EDT SAT MAR 28 2015 STRONG HIGH PRESSURE WILL BE OVERHEAD TODAY. HAVE GIVEN SLIGHT NUDGE TO AFTN MAX TEMPS/ACQUIESCE TO LATE MARCH SOLAR ANGLE AS CORE OF LLVL THERMAL TROF CONTS EWD SHUNT THROUGH LWR GRTLKS TO UPSTATE NY/ERN PA LATER TODAY. AGAIN SIDED SLIGHTLY WARMER WITH MIN TEMPS OWING TO CONT LLVL WAA ALONG WITH UPTICK IN SFC GRADIENT FLOW BY DAYBREAK. AN UPPER LEVEL TROF OF PACIFIC ORIGIN WILL TOP THE WESTERN CONUS RIDGE AND MOVE ACROSS THE FORECAST AREA SUNDAY. THE NAM HAS TRENDED MUCH WARMER IN THE LOW LEVELS THE PAST 24 HOURS. THERE IS AN OUTSIDE CHANCE FOR A BRIEF PERIOD OF FREEZING RAIN SUNDAY MORNING. BUT FOR NOW HAVE KEPT FREEZING RAIN OUT DUE TO UNCERTAINTIES AND VERY LIMITED DURATION.
WINDS WILL THEN VEER TO MORE WESTERLY AND EVENTUALLY NORTHWESTERLY LATE TONIGHT/EARLY SUNDAY MORNING AHEAD OF AN APPROACHING COLD FRONT. /ISSUED 400 AM CDT SAT MAR 28 2015/ UNSEASONABLY WARM AND DRY CONDITIONS ACROSS THE PANHANDLES TODAY WITH HIGHS REACHING INTO THE 80S AS AN UPPER RIDGE BUILDS IN FROM THE WEST THROUGH TONIGHT. THE UPPER RIDGE BREAKS DOWN BY SUNDAY AS A NORTHERN STREAM UPPER TROUGH PUSHES EAST ACROSS THE PLAINS STATES SUNDAY. A COLD FRONT WILL MOVE THROUGH THE FORECAST AREA SUNDAY MORNING WHICH WILL SHIFT THE WINDS TO THE NORTH AND NORTHEAST.
640 PM EDT SAT MAR 28 2015 HIGH PRESSURE OVER INDIANA WILL MOVE TO THE SOUTHEAST STATES BY SUNDAY NIGHT.
350 PM EDT SAT MAR 28 2015 LOW PRESSURE WILL TRACK SOUTH OF THE GULF OF MAINE INTO THE OPEN ATLANTIC THIS EVENING. CANADIAN HIGH PRESSURE WILL APPROACH OVERNIGHT AND CROSS THE REGION SUNDAY.
258 PM MDT SAT MAR 28 2015 SHORT TERM FORECAST CONCERNS ARE THE TIMING OF THE COLD FRONT ACROSS THE FORECAST AREA TONIGHT AND THE WIND SPEEDS DURING THE DAY ON SUNDAY BEHIND THE FRONT. THIS IS IN ADVANCE OF THE COLD FRONT THAT MOVES ACROSS THE FORECAST AREA BETWEEN 06-12Z OVERNIGHT AND ACROSS THE PLAINS STATES THROUGH THE DAY ON SUNDAY AS THE UPPER SHORT WAVE MOVES THROUGH THE UPPER FLOW TOWARDS THE GREAT LAKES AND UPPER MISSISSIPPI VALLEY REGION.
MODEST RIDGING DEVELOPS OVER OUR REGION BEHIND THE SYSTEM ON SUNDAY. BUT IT APPEARS TO BE TOO DRY IN THE LOWER LEVELS TO GENERATE MUCH MORE THAN SOME CLOUD COVER. LOOK FOR COOLER CONDITIONS SUNDAY WITH BREEZY CONDITIONS.
MID/UPPER LEVEL TROUGH OVER THE EASTERN U. HIGH PRESSURE OVER THE OHIO VALLEY WILL MOVE SOUTHEAST OFF THE MID-ATLANTIC COAST SUNDAY WITH NORTHWESTERLY FLOW THIS EVENING SHIFTING TO NORTHEASTERLY BY SUNDAY MORNING. TEMPERATURES WILL COOL INTO THE MID TO UPPER 30S ACROSS MUCH OF THE NATURE COAST TO THE LOWER 50S FROM AROUND TAMPA BAY SOUTH ALONG THE COAST. WITH HIGHS MAINLY IN THE LOWER TO MID 70S. AN UPPER-LEVEL TROUGH EXTENDING OVER THE EASTERN U.
336 PM EDT SAT MAR 28 2015 EASTERN STATES UPPER TROUGH WILL BE DRIFTING OFF THE ATLANTIC COAST DURING THE SHORT TERM. COLD AIR ADVECTION AND LOW THICKNESS VALUES EXPECTED TO GIVE OVERNIGHT LOW TEMPERATURES NEAR OR BELOW FREEZING FOR MUCH OF THE FORECAST AREA.
LIGHT NORTHWESTERLY SURFACE WINDS PREVAILED AS ONLY WEAK LEE TROUGHING WAS PRESENT. WATER VAPOR LOOP SHOWS NORTHWESTERLY FLOW ALOFT BETWEEN RIDGING IN THE WEST AND DEEP TROUGHING IN THE EAST.
A LOW PRESSURE SYSTEM WILL BRING A MIX OF RAIN AND SNOW SUNDAY AND SUNDAY NIGHT. MINIMAL IMPACTS ARE ANTICIPATED FROM THIS SYSTEM WITH LIGHT WET SNOW ACCUMULATIONS OF ONLY AROUND AN INCH OR LESS FOR MOST OF OUR FCST AREA WITH RAPID MELTING AS MAX TEMPS REACH INTO THE LOWER TO MIDDLE 40S SUNDAY AFTERNOON. HIGH PRESSURE WILL PRODUCE MOSTLY SUNNY SKIES TODAY BUT IT WILL REMAIN UNSEASONABLY COLD.
SATELLITE SHOWING RAPID CLEARING THIS MORNING AS COLD FRONT MOVES OFF TO THE EAST. MUCH COOLER WITH HIGHS DOWN 10-15 DEGREES FROM YESTERDAY.
RIDGING BOTH AT THE SURFACE AND ALOFT WILL MAINTAIN THROUGH THE SHORT TERM PERIOD. WILL KEEP ON THE WARMER SIDE OF GUIDANCE.
TODAY IS ABOUT 20F DEGREES COOLER AS NORTHERLY WINDS CONTINUE TO SEND COOL AIR STRAIGHT DOWN THE PENINSULA. TEMPS HAVE BEEN RUNNING A FEW DEGREES COOLER THAN FORECAST. HIGH PRESSURE OVER THE EASTERN U. THE TROUGH OVER THE EASTERN CONUS WILL LIFT OUT WITH A MORE QUASI-ZONAL FLOW TAKING OVER.
AS A COLD FRONT APPROACHES THE REGION. NORTH OF THE LOW. THE FORECAST FOR SUNDAY REMAINS SOMEWHAT TRICKY DUE TO A COLD FRONT MOVING THROUGH THE AREA.
Strong winds associated with the cold front now moving into the plains are still expected later this morning and afternoon. The high wind warning will be continued. Main concern continues to be the strong winds near the surface and clear air turbulence aloft as a cold front move across the area today.