Aikyam-Lab/Synoptic-Bench huggingface dataset:
A STRONG COLD FRONT WILL MOVE RAPIDLY SOUTH ACROSS THE TERMINAL SITES BETWEEN 06Z AND 11Z THIS MORNING. /ISSUED 1040 PM CDT MON MAR 16 2015/ HAVE INCREASED WIND SPEEDS IN THE GRIDS BEHIND THE COLD FRONT BASED ON UPSTREAM OBSERVATIONS. A STRONG COLD FRONT WILL MOVE RAPIDLY SOUTH ACROSS THE TERMINAL SITES THIS EVENING AND TONIGHT. /ISSUED 401 PM CDT MON MAR 16 2015/ HIGH CLOUDS STREAMING ACROSS THE PANHANDLES THIS AFTERNOON FROM AN UPPER LEVEL LOW OVER MEXICO. HIGH TEMPERATURES ARE IN THE LOW 70S TO UPPER 80S ACROSS THE PANHANDLES WITH GUSTY SOUTHWEST WINDS. A COLD FRONT WILL CROSS THE PANHANDLES TONIGHT AND EARLY TUESDAY MORNING. THE DRY CONDITIONS OF LATE WILL GIVE WAY TO SEVERAL CHANCES FOR PRECIPITATION THROUGHOUT THE WEEK AS THE UPPER LEVEL LOW MOVES EASTWARD AND VARIOUS DISTURBANCES IN THE UPPER LEVEL FLOW CROSS THE AREA.
THE EASTERN PACIFIC REGION IS BECOMING MORE ACTIVE AND THE RIDGE IS BREAKING DOWN.
SW FLOW ALOFT WILL USHER IN A SHORT WAVE TROUGH LATE THIS AFTERNOON. THE SHORT WAVE TROUGH THAT MOVES THROUGH THIS AFTERNOON WILL BRING A COLD FRONT WITH IT.
700 AM EDT TUE MAR 17 2015 COLD FRONT WILL MOVE ACROSS NORTHERN OHIO AND NW PA THIS MORNING. HIGH PRESSURE WILL BEGIN TO BUILD INTO THE AREA THIS AFTERNOON.
449 AM EDT TUE MAR 17 2015 UPPER AIR PATTERN CONSISTS 500 MB TROUGH OVER SOUTH CENTRAL CANADA INTO THE GREAT LAKES REGION WITH THIS TROUGH DIGGING INTO NEW ENGLAND. THEY ARE VERY DRY AND WELL MIXED UP TO ABOUT 700 MB OR SO WITH INVERTED-V SOUNDINGS IN THE LOW LEVELS. THIS WOULD BE VERY HARD TO GET ANY LAKE EFFECT SNOW SHOWERS WITH THE DRY AIR ESPECIALLY IN THE LOW LEVELS AND CUT POPS BACK FOR THIS FORECAST PERIOD ACROSS THE EASTERN CWA. WIDESPREAD PRECIPITATION CHANCES APPEAR ON THE LOW SIDE.
/ISSUED 309 PM EDT MON MAR 16 2015/ A FEW SHOWERS OVER THE INTERIOR AREAS THIS AFTERNOON AS A VERY WEAK CENTER OF LOW PRESSURE DISSIPATES OVER SOUTH FLORIDA. AS THIS LOW FADES AWAY, HIGH PRESSURE WILL BUILD OVER THE CWA. HOWEVER, THERE DOES APPEAR TO BE A WEAK TROUGH THAT MOVES ACROSS SOUTH FLORIDA TOMORROW AS WELL. NOT EXPECTING ANY PRECIPITATION WITH THIS TROUGH, BUT CLOUD COVER WILL INCREASE AND THERE COULD BE A FEW SPRINKLES, POSSIBLY NEAR THE HOMESTEAD AREA. LOOKING AT THE MODELS, IT APPEARS THAT THE LOW DEVELOPS EACH DAY FOR THE NEXT FEW DAYS, SO IT IS MORE LIKELY A THERMAL LOW FORMING OVER THE INTERIOR. BY WEDNESDAY AFTERNOON, AN UPPER LEVEL RIDGE AT 500MB BREAKS DOWN AND A MORE DEFINED LOW DEVELOPS OVER SOUTH FLORIDA. THIS LOW WILL GENERALLY JUST AFFECT THE WIND DIRECTIONS AT THE SFC.
A COLD FRONTAL BOUNDARY SLIPS SOUTH ACROSS THE GREAT VALLEY TODAY GENERATING A BKN-OVC LAYER JUST ABOVE MVFR CATEGORY.
ANTICIPATE FURTHER CLOUD DEVELOPMENT AHEAD OF A COLD FRONT CURRENTLY LOCATED NORTH OF A STL TO IND LINE.
112 AM EDT TUE MAR 17 2015 HIGH PRESSURE WILL GRADUALLY RETREAT SOUTH OF THE REGION THIS AFTERNOON THROUGH TUESDAY. A COLD FRONT WILL MOVE THROUGH TUESDAY NIGHT. THEN WILL STALL SOUTH OF THE AREA WHILE A WEDGE OF HIGH PRESSURE BUILDS IN FROM THE NORTH.
140 AM EDT TUE MAR 17 2015 A COLD FRONT WILL BRING THE CLOUDS AND SPRINKLES THROUGH THE MORNING. COOLER CONDITIONS ARE EXPECTED FOR THE REST OF THE WEEK.
HIGH PRESSURE WILL THEN MOVE FROM THE NRN PLAINS TO NRN IL. 925-850 MB TEMPS SUGGEST HIGH TEMPS IN THE LOWER TO MID 40S TODAY.
344 AM CDT TUE MAR 17 2015 HIGH PRESSURE OVER ERN MT AND WRN ND WILL MOVE INTO IA THIS EVENING. A MUCH COOLER DAY TODAY WITH STRONG COLD AIR ADVECTION. THOUGH TEMPERATURES WILL BE 25 TO 35 DEGREES COOLER THAN YESTERDAY. STRONGER SHORT WAVE OF SIMILAR TRACK WILL CROSS WRN RIDGE INTO THE MO VALLEY TOWARD MON.
TONIGHT THROUGH TUESDAY A COLD FRONT WILL CONTINUE MOVING SOUTH THROUGH THE AREA TONIGHT. COOLER TEMPERATURES WITH LIGHT PRECIPITATION WILL BE OVER THE NORTH SPREADING SOUTH TONIGHT. TEMPERATURES WILL BE COOLER TONIGHT MOST AREAS BUT THE COLD AIR WILL LIFT BACK NORTH THROUGH THE DAY TUESDAY AS SOUTHWEST WINDS INCREASE BRINGING WARMING AND DRYING.
405 AM CDT Tue Mar 17 2015 WV imagery shows a broad, upper-lvl ridge extending from the Gulf Coast NW to the ID panhandle, interrupted by a cut-off low over Sinaloa to the SW. Satellite imagery already shows probable convection developing on the east side of the trough, w/models bringing this activity north thru the Big Bend area later today into an area of upper-lvl divergence. Meanwhile, to the north, sfc analysis shows a cold front entering the Texas Panhandle, and models peg fropa at KMAF shortly after 18Z. This will enhance convection moving up from the south, especially overnight as the trough moves thru the FA. Given the cold front, precip, and cloud cover, temps this afternoon should come in well-blo normal.
A NEGATIVE TILT UPPER LEVEL TROUGH IS APPROACHING THE WEST COAST. THE TROUGH WILL MOVE THROUGH ON TUESDAY. WEST WINDS WILL BE INCREASING LATER TUESDAY WITH THE TROUGH PASSAGE.
HIGH PRESSURE ACROSS THE WESTERN GULF OF MEXICO WILL EDGE TO THE SOUTHEAST THROUGH THE DAY ALLOWING A MORE WESTERLY SURFACE FLOW TO SET UP ACROSS THE FLORIDA PENINSULA. UPPER RIDGING BUILDS ACROSS THE PENINSULA ON WEDNESDAY KEEPING DRY AND ABOVE NORMAL TEMPERATURES ACROSS THE AREA.
416 AM EDT TUE MAR 17 2015 MAIN FEATURE OF INTEREST THIS MORNING CONTINUES TO BE A COLD FRONT DIVING SOUTHWARD INTO THE OHIO RIVER VALLEY. SOUTHWEST FLOW AHEAD OF THE FRONT IS HELPING TO CREATE A GOOD RIDGE/VALLEY SPLIT ACROSS THE AREA THIS MORNING WITH COOL 40 DEGREE READINGS IN THE VALLEYS WITH TEMPERATURES NEAR 60 IN THE BLUEGRASS AND SOME OF THE RIDGES. THIS WILL PUT HIGHS INTO THE LOWER 60S FOR MOST AREAS TODAY. ALLOWING VALLEY LOCATIONS TO FALL WELL INTO THE 20S WITH READINGS IN THE LOWER 30S ON THE RIDGES.
321 AM EDT TUE MAR 17 2015 UPPER AIR PATTERN CONSISTS 500 MB TROUGH OVER SOUTH CENTRAL CANADA INTO THE GREAT LAKES REGION WITH THIS TROUGH DIGGING INTO NEW ENGLAND. THEY ARE VERY DRY AND WELL MIXED UP TO ABOUT 700 MB OR SO WITH INVERTED-V SOUNDINGS IN THE LOW LEVELS. THIS WOULD BE VERY HARD TO GET ANY LAKE EFFECT SNOW SHOWERS WITH THE DRY AIR ESPECIALLY IN THE LOW LEVELS AND CUT POPS BACK FOR THIS FORECAST PERIOD ACROSS THE EASTERN CWA. HIGH PRESSURE CENTERED OVER S MND IA AT 00Z WILL SLOWLY SHIFT E AND ACROSS THE UPPER GREAT LAKES WEDNESDAY THROUGH WEDNESDAY NIGHT.
THE COLD FRONT STARTED TO PUSH INTO FAR NWRN OK THIS MORNING AROUND 2-230AM CDT. AS THE TROUGH LIFTS INTO THE UPPER RIO GRANDE VALLEY/TRANS PECOS REGION THIS EVENING. PRIMARILY ACROSS NRN OK AS ANOTHER COLD FRONT NUDGES SOUTH ACROSS THE SRN PLAINS AS OUR NEXT H500 TROUGH MOVES INTO THE SW U.
COLD FRONT BRINGS LIGHT RAIN SHOWERS TUESDAY. FOLLOWED BY A COOLER WEDNESDAY.
A cold front is still on track to arrive this afternoon with winds becoming northeast.
325 AM CDT Tue Mar 17 2015 As of 3 AM, a strong cold front was in the process of moving south across central Missouri. Temperatures ahead of the front have remained in the 50s and even the lower 60s for much of the night.
604 AM EDT TUE MAR 17 2015 A COLD FRONT WILL PUSH SOUTHEAST ACROSS THE REGION THIS MORNING. HIGH PRESSURE WILL THEN BUILD ACROSS THE AREA FOR MID WEEK.
LARGE RIDGE/VALLEY SPLITS SHOULD HOLD THROUGH THE REMAINDER OF THE NIGHT AS WE REMAIN JUST AHEAD OF AN APPROACHING COLD FRONT. THE MAIN FEATURE WILL BE A POTENT COLD FRONT DROPPING SOUTH THROUGH THE REGION ON TUESDAY. WARM AIR ADVECTION WILL PERSIST AHEAD OF THE FRONT AND CONDITIONS WILL BE FAVORABLE FOR RIDGE/VALLEY TEMPERATURE DIFFERENCES TO DEVELOP UNDER MOSTLY CLEAR SKIES THIS EVENING. MODELS ARE IN GOOD AGREEMENT THAT HIGH PRESSURE WILL BUILD SE OUT OF THE NORTHERN PLAINS AS COLD FRONT EXITS TO THE SOUTH ON WEDNESDAY. THIS FRONT WILL USHER IN COOLER TEMPS THAN WE HAVE BEEN SEEING THE PAST COUPLE OF DAYS WITH HIGHS IN THE LOW TO MID 50S.
524 AM EDT TUE MAR 17 2015 COLD FRONT WILL MOVE ACROSS NORTHERN OHIO AND NW PA THIS MORNING. HIGH PRESSURE WILL BEGIN TO BUILD INTO THE AREA THIS AFTERNOON.
A STRONG VERTICALLY STACKED RIDGE IS CURRENTLY SITTING OVER THE WESTERN GULF OF MEXICO. UNDER THE EFFECTS OF THIS RIDGE. AND LOWS TONIGHT RANGING FROM THE UPPER 50S OVER THE NATURE COAST TO THE LOW TO MID 60S ACROSS WEST CENTRAL AND SOUTHWEST FLORIDA. A WEAK BACKDOOR COLD FRONT WILL MOVE INTO NORTHERN FLORIDA.
A TRANSITORY UPPER RIDGE CROSSES THE REGION FOR WED AND THU.
UPPER LOW WILL LIFT NORTHEAST OUT OF THE BAJA REGION TODAY INTO TONIGHT WITH RAIN LIKELY SPREADING INTO EASTERN OKLAHOMA AFTER MIDNIGHT. LARGE AREA OF LIGHT TO MODERATE RAIN WILL CONTINUE DURING THE DAY WEDNESDAY BEFORE TAPERING OFF AS UPPER LOW SHIFTS EAST OF THE REGION BY WEDNESDAY EVENING.
A COLD FRONT WILL MOVE THROUGH THE TAF SITES TODAY. UPPER LOW WILL LIFT NORTHEAST OUT OF THE BAJA REGION TODAY INTO TONIGHT WITH RAIN LIKELY SPREADING INTO EASTERN OKLAHOMA AFTER MIDNIGHT. LARGE AREA OF LIGHT TO MODERATE RAIN WILL CONTINUE DURING THE DAY WEDNESDAY BEFORE TAPERING OFF AS UPPER LOW SHIFTS EAST OF THE REGION BY WEDNESDAY EVENING.
A DRY SFC COLD FRONT WILL BEGIN BLASTING THROUGH THE REGION AROUND SUNRISE. HIGHS WILL BE NOTICEABLY COOLER THAN YESTERDAY. CLOUDS WILL BE ON THE INCREASE AGAIN WED AS A WEAKENING DEEP SOUTH LOW PRESSURE SYSTEM PROVIDES SOME LIFT OF MOISTURE ALOFT. THERE WILL BE QUITE A BIT OF DRY AIR HERE IN THE LOW LEVELS.
311 AM CDT Tue Mar 17 2015 Significantly cooler temperatures are anticipated in the wake of a strong cold front which swept through the region early this morning; however, highs are still expected to reach or even slightly exceed their seasonal normals in the mid to possibly upper 50s. Cooler air filtering in under the upper trough and cloud cover/evaporative cooling associated with any rain showers will make Wednesday the coolest day in the forecast period, with highs remaining in the lower to mid 50s.
347 AM EDT TUE MAR 17 2015 COLD FRONT WILL MOVE ACROSS NORTHERN OHIO AND NW PA THIS MORNING. HIGH PRESSURE WILL BEGIN TO BUILD INTO THE AREA THIS AFTERNOON.
337 AM CDT Tue Mar 17 2015 07z/2am surface map shows cold front sinking southward toward the I-70 corridor. High temperatures will be about 25 degrees cooler than yesterday, generally topping out in the lower to middle 50s. High pressure will build into the region tonight, providing clear skies and diminishing winds.
611 AM EDT TUE MAR 17 2015 A COLD FRONT WILL PUSH SOUTHEAST ACROSS THE REGION THIS MORNING. HIGH PRESSURE WILL THEN BUILD ACROSS THE AREA FOR MID WEEK.
A VERY WEAK TROF AND BIG BATCH OF CLOUDS WILL MOVE OVERHEAD TODAY. THERE WILL BE SOME VIRGA AND A SLIM CHC OF A BRIEF SHOWER OVER THE HIGHER TERRAIN. THE WEAK TROF CUTS OFF AND BECOMES A WEAK UPPER LOW ON WEDNESDAY. A RIDGE WILL BUILD IN WEDNESDAY NIGHT AND THE MARINE INVERSION SHOULD QUICKLY REFORM. MOST OF THE COASTS AND SOME OF THE LOWER VLYS WILL SEE LOW CLOUDS. ASIDE FROM THE LOW CLOUDS SKIES WILL BE PARTLY CLOUDY.
/ISSUED 705 PM EDT MON MAR 16 2015/ NORTHWEST UPPER FLOW ON THE DOWNHILL SIDE OF THE GULF OF MEXICO UPPER RIDGE FLATTENS THROUGH THE PERIOD AS THE RIDGE WEAKENS. WEAK COLD FRONT PUSHES THROUGH ON TUESDAY.
Moisture stream continues to move up from the south into NorCal early this morning in the southerly flow between the trough over the eastern Pacific and the strong upper ridge centered from the Gulf of Mexico into the northern Rockies.
WARM HIGH PRESSURE CENTERED OVER THE GULF COAST WILL YIELD TO A MAINLY DRY COLD FRONT THAT WILL CROSS OUR REGION THIS AFTERNOON AND EVENING. COLDER CANADIAN HIGH PRESSURE WILL FOLLOW FOR TONIGHT THROUGH WEDNESDAY NIGHT. WEST-SOUTHWEST LOW-LEVEL FLOW WILL CONTINUE ON TUESDAY WITH LEE SIDE TROUGHING AT THE SURFACE AND NORTHWESTERLY FLOW ALOFT. 1000-850MB THICKNESSES SHOULD START OUT ABOVE 1380M IN THE MORNING AND 850MB TEMPS WILL APPROACH 15C BEFORE SLOWLY FALLING DURING THE AFTERNOON AS A COLD FRONT APPROACHES FROM THE NORTHWEST. MUCH COOLER AIR WILL RUSH IN BEHIND THE FRONT TUESDAY NIGHT AS ANOTHER COLD CANADIAN HIGH BUILDS ACROSS THE MIDWEST AND THICKNESSES TAKE A 70M DIVE TO AROUND 1300M OVERNIGHT. THE CLOSED UPPER LOW CURRENTLY OFF THE BAJA COAST.
549 AM EDT TUE MAR 17 2015 LOW PRESSURE WILL TRACK FROM MONTREAL TO NOVA SCOTIA TODAY AND DRAG A COLD FRONT ACROSS THE REGION. LOW PRESSURE LOOKS TO PASS JUST TO OUR SOUTH OVER THE WEEKEND. WE CONTINUE WITH A WESTERN RIDGE AND EASTERN TROUGH PATTERN. WE BEGIN THE PERIOD WITH HIGH PRESSURE.
400 AM EDT TUE MAR 17 2015 A SHARP CHANGE TO MUCH COLD WEATHER IS IN STORE LATE TONIGHT INTO TUESDAY BEHIND A STRONG COLD FRONT.
323 AM CDT TUE MAR 17 2015 GENERALLY QUIET SENSIBLE WEATHER THROUGH MID-WEEK AS AN AREA OF HIGH PRESSURE MOVES FROM THE NORTHERN PLAINS SOUTHEAST INTO THE MIDWEST. AROUND OR JUST SLIGHTLY WARMER THAN TODAY. AT MID-LEVELS NORTHWESTERLY FLOW WAS PRESENT OVER THE UPPER MIDWEST WHILE A BROAD RIDGE EXISTED OVER THE NORTHERN ROCKIES. LOWS IN THE LOW TO MID 20S DUE TO THE CLOUD COVER IN PLACE AND NEAR-NEUTRAL TO SLIGHTLY WARM AIR ADVECTION OVERNIGHT. HIGHS WILL BE NEAR TO SLIGHTLY WARMER THAN TODAY DUE TO WEAK WARM AIR ADVECTION. HIGHS IN THE LOW/MID 40S. THE REMAINDER OF THE EXTENDED TIME PERIOD WILL BE DOMINATED BY THE DEVELOPMENT OF A MAJOR UPPER LEVEL TROUGH FROM CENTRAL CANADA INTO THE GREAT LAKES. A FEW OPPORTUNITIES FOR LIGHT PRECIPITATION WILL EXIST WHILE THE UPPER LEVEL TROUGH REMAINS OVER THE REGION.
A COLD FRONT WILL PUSH ACROSS THE THREE TAF SITES THIS EVENING AROUND 23Z TODAY TO 03Z WEDNESDAY RESULTING IN EASTERLY TO NORTHEAST WINDS 10 TO 20 KNOTS AFTER THE PASSAGE OF THE COLD FRONT. AN UPPER TROUGH WILL APPROACH THE TAF SITES TONIGHT AND WEDNESDAY WHICH WILL CAUSE THE VFR CONDITIONS TO BECOME MVFR AROUND 21Z TO 23Z TODAY. TODAY AND TONIGHT EARLY MORNING WATER VAPOR SATELLITE IMAGERY INDICATES A DEEP UPPER LOW NEAR BAJA CALIFORNIA WITH SOUTHWEST UPPER FLOW OVER THE SOUTHERN PLAINS. SINCE TEMPERATURES WILL START OUT WELL ABOVE FREEZING. HOWEVER COMPLICATING THE FORECAST IS THE POSSIBILITY FOR LIGHT FREEZING RAIN AND/OR DRIZZLE AS MODEL SOUNDINGS INDICATE DRY AIR IN THE SNOW GROWTH ZONE THIS EVENING/TONIGHT. THE PASSAGE OF THIS COLD FRONT WILL LEAD TO A COLD NIGHT.
601 AM EST TUE MAR 3 2015 AN AREA OF LOW PRESSURE WILL MOVE ACROSS THE CENTRAL GREAT LAKES TODAY AND A COLD FRONT WILL MOVE ACROSS THE REGION TONIGHT. THE FRONT WILL THEN STALL SOUTH OF THE AREA AS ANOTHER LOW PRESSURE SYSTEM TRACKS ALONG IT FOR WEDNESDAY AFTERNOON AND NIGHT.
A COLD FRONT WILL MOVE ACROSS THE AREA THIS AFTERNOON AND EVENING SHIFTING WINDS. A COLD FRONT IS EXPECTED TO MOVE INTO NW PARTS OF THE FA THIS AFTERNOON AND MOVE ACROSS THE REGION. ICE ACCUMULATIONS OF AROUND A TENTH OF AN INCH WILL BE POSSIBLE IN SOUTHEAST PARTS OF THE FA WHERE WOULD LIKELY RECEIVE THE HEAVIEST FREEZING RAIN. IF SFC TEMPS DROP BELOW FREEZING SOONER THAN CURRENTLY FORECAST HIGHER ICE ACCUMULATIONS COULD BE POSSIBLE.
A COLD FRONT IS STILL EXPECTED TO BRING A SOAKING RAIN TO MIDDLE TENNESSEE TONIGHT AND WEDNESDAY. SCATTERED SHOWERS ARE POSSIBLE THIS MORNING, BUT BECOME MORE LIKELY IN THE AFTERNOON AS ATMOSPHERE MOISTENS AHEAD OF A STRONG COLD FRONT TO OUR NORTHWEST. STILL LOOK FOR THE COLD FRONT TO BE IN OUR EXTREME NORTHWESTERN COUNTIES BY MIDNIGHT TONIGHT, PASSING SOUTH OF NASHVILLE AROUND 6 AM CST ON WEDNESDAY, AND THEN FINALLY CLEARING THE MID STATE BY TOMORROW EVENING. EXPECT MUCH COLDER AIR TO SPREAD IN BEHIND THE COLD FRONT, BRINGING, FIRST, A WINTRY MIX OF SLEET AND FREEZING RAIN, THEN EVENTUALLY CHANGING OVER TO MAINLY A SNOW AND SLEET MIX.
AND A MODEST WARMING TREND ARE EXPECTED FOR THE REMAINDER OF THE WEEK AS AN UPPER LEVEL RIDGE OF HIGH PRESSURE BUILDS INTO THE COAST.
THE COLDEST TEMPERATURES ARE EXPECTED TONIGHT INTO TOMORROW MORNING, WITH BELOW FREEZING TEMPERATURES LIKELY IN WEST SIDE VALLEYS. AGRICULTURAL INTERESTS MAY NEED TO TAKE PRECAUTIONS TO PROTECT NEW GROWTH RESULTING FROM THE WARMER THAN NORMAL TEMPERATURES OF THE PAST SEVERAL WEEKS.
SNOW IS EXPECTED TO DEVELOP RIGHT OVER THE FORECAST AREA AS A TROUGH PUSHES INTO THE UPPER MISSISSIPPI RIVER VALLEY AND ISENTROPIC LIFT INCREASES ON THE 270-310K SURFACES. AS THE LOW MOVES EAST WE START TO LOSE ICE ALOFT OVER THESE AREAS SO WE COULD EVEN SEE A BRIEF PERIOD OF FREEZING DRIZZLE. A STRONG COLD FRONT SWEEPS THROUGH THE REGION THIS AFTERNOON AND THIS IS WHEN WE WILL LIKELY SEE MORE IMPACTS TO TRAVEL.
931 AM EST TUE MAR 3 2015 HIGH PRESSURE WILL SLIDE SOUTH OF THE AREA TODAY. A FAST MOVING TROUGH OF LOW PRESSURE WILL CROSS THE REGION TONIGHT.
TODAY AND TONIGHT EARLY MORNING WATER VAPOR SATELLITE IMAGERY INDICATES A DEEP UPPER LOW NEAR BAJA CALIFORNIA WITH SOUTHWEST UPPER FLOW OVER THE SOUTHERN PLAINS. SINCE TEMPERATURES WILL START OUT WELL ABOVE FREEZING. HOWEVER COMPLICATING THE FORECAST IS THE POSSIBILITY FOR LIGHT FREEZING RAIN AND/OR DRIZZLE AS MODEL SOUNDINGS INDICATE DRY AIR IN THE SNOW GROWTH ZONE THIS EVENING/TONIGHT. THE PASSAGE OF THIS COLD FRONT WILL LEAD TO A COLD NIGHT.
A WEAK COLD FRONT WILL SPREAD SNOW SHOWERS ACROSS NORTHERN NEVADA EARLY THIS MORNING. WITH WARMER AND CONTINUED DRY CONDITIONS FOR THE LATTER HALF OF THE WEEK.
AS UPPER LEVEL LOW ACROSS CANADA PUSHES EAST DROPPING FRONTAL BOUNDARY INTO IOWA. WITH ONGOING FREEZING RAIN AND MIXED PRECIPITATION ACROSS SOUTHERN CWA.
High pressure is building in the eastern Pacific while a low pressure system digs into Idaho and Montana. The ridge of high pressure will ease into the Pacific Northwest tonight and Wednesday. then flatten late Wednesday and Wednesday night as another Pacific short wave over tops the ridge. Expect morning lows ranging from the lower teens to lower 20s both mornings.
330 AM PST TUE MAR 3 2015 HIGH PRESSURE WILL MOVE INTO THE AREA TODAY AND KICK OFF A PERIOD OF CLEAR WEATHER WITH A WARMING TREND THAT WILL LAST INTO THE WEEKEND. THE UPPER LOW RESPONSIBLE FOR LAST EVENINGS SHOWERS AND THUNDERSTORMS IS NOW SW OF SAN DIEGO. THERE ARE SOME LINGERING SHOWERS OVER THE COASTAL WATERS RIGHT NOW BUT THESE SHOULD MOST BE OUT OF THE AREA BY DAWN AS THE LOW DRAGS THEM SOUTHWARD. OFFSHORE CANYONS WINDS EACH MORNING WILL BE BELOW ADVISORY CRITERIA IN ALL BUT THE WINDIEST RIDGETOP LOCATIONS.
Low pressure area is centered off the coast of Southern California this morning.
HIGH PRESSURE LIES OFF THE EAST COAST AND IS STAYING STRONG ON THE EAST SIDE OF THE APPALACHIANS WHILE LOW PRESSURE IS MOVING INTO THE NORTHERN MS VALLEY AND WESTERN GREAT LAKES. TEMPERATURES ARE MOSTLY IN THE LOWER TO MID 40S WITH SOME UPPER 30S IN A FEW SPOTS. LOW LEVEL SOUTHWEST FLOW WILL INCREASE LATE TODAY BUT THERE WILL BE CLOUDY SKIES AND SLOW WARMING INTO THE 50S THROUGHOUT THE DAY WITH HIGHS COMING LATE AS WARMER AIR MOVES UP FROM THE SOUTH. HIGHS TODAY WILL ALSO BE CLOSE TO THE LOWS AS WARMER AIR MOVES IN LATE.
OTHERWISE LIGHT S TO SE WINDS THRU TONIGHT WITH HIGH PRESSURE OFFSHORE. AN ELEVATED RISK ALSO APPEARS LIKELY TOWARDS THE END OF THE WEEK AS A STRONG ONSHORE FLOW DEVELOPS IN THE WAKE OF A COLD FRONT.
LOOK FOR IFR CIGS TO SETTLE IN ACROSS THE MID STATE WELL AHEAD OF AN APPROACHING STRONG COLD FRONT. A COLD FRONT IS STILL EXPECTED TO BRING A SOAKING RAIN TO MIDDLE TENNESSEE TONIGHT AND WEDNESDAY. SCATTERED SHOWERS ARE POSSIBLE THIS MORNING, BUT BECOME MORE LIKELY IN THE AFTERNOON AS ATMOSPHERE MOISTENS AHEAD OF A STRONG COLD FRONT TO OUR NORTHWEST. STILL LOOK FOR THE COLD FRONT TO BE IN OUR EXTREME NORTHWESTERN COUNTIES BY MIDNIGHT TONIGHT, PASSING SOUTH OF NASHVILLE AROUND 6 AM CST ON WEDNESDAY, AND THEN FINALLY CLEARING THE MID STATE BY TOMORROW EVENING. EXPECT MUCH COLDER AIR TO SPREAD IN BEHIND THE COLD FRONT, BRINGING, FIRST, A WINTRY MIX OF SLEET AND FREEZING RAIN, THEN EVENTUALLY CHANGING OVER TO MAINLY A SNOW AND SLEET MIX.
DENSE FOG WILL LINGER UNTIL AROUND NOON AS A VERY MOIST LAYER IS ENCOUNTERING A WEAKENING WARM FRONT LIFTING OUT OF THE GULF. WARM SATURATED AIR FROM THE LOWER GULF HAS BEEN ADVECTED OVER COOLER WATERS AS WELL AS COOL GROUND COVER AND WITH THE LIGHT WINDS. WEDNESDAY NIGHT AN ARCTIC COLD FRONT IS EXPECTED TO MOVE THROUGH WITH MUCH COLDER TEMPS.
ISENTROPIC LIFT DECREASES AS SOUTHERLY FLOW TAKES HOLD ALLOWING FOR SOME SUN AND THE WARMER TEMPERATURES. THE LOWER LEVEL JET STRENGTHENS TONIGHT ALLOWING SOME STREAMER SHOWERS TO DEVELOP. ANOTHER STRONG COLD FRONT.
OTHERWISE PARTIAL CLEARING BEHIND A LOW PRESSURE SYSTEM EXITING THE STATE.
618 AM EST TUE MAR 3 2015 HIGH PRESSURE WILL CREST ACROSS THE AREA THIS MORNING BEFORE SHIFTING OFFSHORE. LOW PRESSURE WILL SWING THROUGH SOUTHERN CANADA TONIGHT TRYING TO PUSH A WARM FRONT NORTH ACROSS THE REGION. AS THE LOW SHIFTS TO OUR NORTH. IT WILL DRAG A COLD FRONT THROUGH THE REGION LATE WEDNESDAY.
A WEAK SURFACE WEDGE OF HIGH PRESSURE WILL BUILD SOUTH INTO OUR REGION TODAY BEHIND A BACK DOOR FRONT. THEN RETURN NORTH AS A WARM FRONT EARLY WEDNESDAY PROVIDING QUITE WARM TEMPERATURES WEDNESDAY.
926 AM EST TUE MAR 3 2015 DEEP LAYER RIDGE CENTERED EAST OF REGION WILL CONTINUE TO PROVIDE FAIRLY DRY CONDITIONS AND ABOVE NORMAL TEMPERATURES.
A COLD UPPER TROUGH WILL CROSS THE REGION TODAY. HIGH PRESSURE WILL BRING A DRYING AND WARMING TREND THROUGH THE REST OF THE WEEK.
SOUTHEAST LOW LEVEL FLOW AROUND HIGH PRESSURE OFF THE SOUTHEAST U. TEMPERATURES WILL WARM INTO THE LOWER TO MID 80S.
A COLD FRONT IS EXPECTED TO MOVE INTO NW PARTS OF THE FA THIS AFTERNOON AND MOVE ACROSS THE REGION. ICE ACCUMULATIONS OF AROUND A TENTH OF AN INCH WILL BE POSSIBLE IN SOUTHEAST PARTS OF THE FA WHERE WOULD LIKELY RECEIVE THE HEAVIEST FREEZING RAIN. IF SFC TEMPS DROP BELOW FREEZING SOONER THAN CURRENTLY FORECAST HIGHER ICE ACCUMULATIONS COULD BE POSSIBLE.
A TRANSITION TO FREEZING/FROZEN PRECIPITATION MAY OCCUR WEDNESDAY AFTERNOON. A WARM FRONT IS FORECAST TO LIFT NORTH THROUGH THE FORECAST AREA TODAY SCOURING OUT THE REMAINING SHALLOW COLD AIRMASS THAT HAS PLAGUED THE REGION SINCE LATE LAST WEEK. A STRONG COLD FRONT WILL SWEEP DOWN THE PLAINS TODAY. SOME LIGHT FREEZING RAIN WILL BE POSSIBLE IN THE NORTHWESTERN ZONES WEDNESDAY MORNING. SOME FREEZING RAIN AND SLEET WILL BE POSSIBLE ACROSS THE NORTHWESTERN HALF BEFORE SUNSET WEDNESDAY. AS THE NAM SOUNDINGS ARE A LITTLE WARMER. HAVE LEANED CLOSER TO THE GFS AND THUS PLACED RAIN/FREEZING RAIN AND SOME SLEET ACROSS THE NORTHWESTERN HALF FOR WEDNESDAY AFTERNOON. WE SHOULD THEN SEE A TRANSITIONING OVER TO A SLEET/SNOW MIX ACROSS THE NORTHERN 2/3S AND FREEZING RAIN/SLEET MIX ACROSS THE SOUTH FOR WEDNESDAY EVENING.
WE BEGIN THE PERIOD VERY COLD ON WEDNESDAY AS ARCTIC HIGH PRESSURE OVER SOUTHEAST SASKATCHEWAN DRIFTS SOUTHEAST ACROSS THE FORECAST AREA DURING THE DAY WEDNESDAY.
412 AM MST TUE MAR 3 2015 THE ELONGATED TROUGH WAS STRETCHED FROM SOUTHERN CALIFORNIA THROUGH THE GREAT BASIN NE INTO MANITOBA. THE TROUGH SLOWLY SHIFTS EASTWARD AND WILL PASS ON WEDNESDAY. THE FINAL COLD FRONT WILL WORK INTO THE NORTH THIS AFTERNOON THEN DROP THROUGH THE FORECAST AREA OVERNIGHT WITH THE BEST FRONTAL FORCING IN OUR EASTERN ZONES. A RIDGE WILL CONTINUE BUILDING ALONG THE WEST COAST WED NGT AND SLOWLY SLIDE INLAND.
SKIES ARE MOSTLY SUNNY WITH A DEEP RIDGE GOVERNING ON THE SYNOPTIC SCALE. A LARGE AREA OF HIGH PRESSURE CENTERED OVER THE NORTHEASTERN UNITED STATES WILL MOVE EASTWARD OVER THE WESTERN NORTH ATLANTIC THIS AFTERNOON. THE ASSOCIATED RIDGE AXIS WILL SETTLE SOUTHWARD TONIGHT.
549 AM EST TUE MAR 3 2015 HIGH PRESSURE WILL SLIDE SOUTH OF THE AREA TODAY. A FAST MOVING TROUGH OF LOW PRESSURE WILL CROSS THE REGION TONIGHT.
A COLD FRONT WILL PUSH ACROSS THE THREE TAF SITES THIS EVENING AROUND 23Z TODAY TO 03Z WEDNESDAY RESULTING IN EASTERLY TO NORTHEAST WINDS 10 TO 20 KNOTS AFTER THE PASSAGE OF THE COLD FRONT. AN UPPER TROUGH WILL APPROACH THER TAF SITES TONIGHT AND WEDNESDAY WHICH WILL CAUSE THE VFR CONDITIONS TO BECOME MVFR AROUND 21Z TO 23Z TODAY. TODAY AND TONIGHT EARLY MORNING WATER VAPOR SATELLITE IMAGERY INDICATES A DEEP UPPER LOW NEAR BAJA CALIFORNIA WITH SOUTHWEST UPPER FLOW OVER THE SOUTHERN PLAINS. SINCE TEMPERATURES WILL START OUT WELL ABOVE FREEZING. HOWEVER COMPLICATING THE FORECAST IS THE POSSIBILITY FOR LIGHT FREEZING RAIN AND/OR DRIZZLE AS MODEL SOUNDINGS INDICATE DRY AIR IN THE SNOW GROWTH ZONE THIS EVENING/TONIGHT. THE PASSAGE OF THIS COLD FRONT WILL LEAD TO A COLD NIGHT.