Area Forecast Discussion
Issued by NWS Mt. Holly, NJ

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000 FXUS61 KPHI 290218 AFDPHI AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE MOUNT HOLLY NJ 918 PM EST WED JAN 28 2015 .SYNOPSIS... HIGH PRESSURE WILL MOVE IN FROM THE WEST OVERNIGHT AND OFFSHORE ON THURSDAY. LOW PRESSURE WILL MOVE ACROSS THE GREAT LAKES THURSDAY NIGHT AND REFORM NEAR CAPE COD ON FRIDAY. THIS WILL CAUSE AN ARCTIC FRONT TO CROSS THE REGION FRIDAY AFTERNOON. MORE HIGH PRESSURE WILL MOVE IN FROM THE OHIO VALLEY AND OVER THE REGION THIS WEEKEND. A COMPLEX STORM SYSTEM WILL AFFECT THE REGION EARLY NEXT WEEK. && .NEAR TERM /UNTIL 6 AM THURSDAY MORNING/... HIGH PRESSURE WAS CENTERED OVER SOUTHWESTERN PENNSYLVANIA AND VICINITY THIS EVENING. THE HIGH WILL DRIFT TO THE EAST WITH ITS AXIS REACHING OUR REGION TOWARD MORNING. THE SKY IS EXPECTED TO REMAIN CLEAR FOR MUCH OF THE NIGHT WITH PERHAPS SOME WISPS OF CIRRUS ARRIVING NEAR DAYBREAK. THE NORTHWEST WIND WILL CONTINUE TO DIMINISH AS IT VEERS TOWARD THE NORTH. THE WIND WILL LIKELY BECOME LIGHT AND VARIABLE AT MANY LOCATIONS. THE LIGHT WIND, CLEAR SKY AND SNOW COVER WILL CAUSE TEMPERATURES TO FALL QUITE A BIT OVERNIGHT. MINIMUM READINGS SHOULD BE IN THE SINGLE DIGITS IN THE NORTH AND IN THE TEENS ACROSS THE SOUTH. && .SHORT TERM /6 AM THURSDAY MORNING THROUGH 6 PM THURSDAY/... THE HIGH PRESSURE WILL SHIFT TO OUR SOUTH AND EAST ON THURSDAY AS A LOW PRESSURE SYSTEM TRACKS TOWARD THE MID ATLANTIC FROM THE GREAT LAKES REGION. CLEAR SKIES WILL START TO CLOUD UP AS THE NEXT SYSTEM APPROACHES. PRECIPITATION LOOKS TO HOLD OFF UNTIL LATER IN THE DAY BUT WE MIGHT START TO SEE OUR FIRST FLAKES FALL DURING THE AFTERNOON/EARLY EVENING HOURS. TEMPERATURES WILL GENERALLY RISE INTO THE UPPER 20S TO LOWER 30S THROUGH MUCH OF THE REGION, WITH MID TO UPPER 30S ACROSS SOUTHERN DELAWARE AND ALONG THE COAST. && .LONG TERM /THURSDAY NIGHT THROUGH WEDNESDAY/... THE MID-LEVEL PATTERN FEATURES THE POLAR VORTEX OVER HUDSON`S BAY... A RIDGE INVOF THE WEST COAST OF NOAM AND A SOUTHERN STREAM CUT OFF LOW NEAR BAJA CALIFORNIA...THAT MAY FINALLY EJECTED NORTHEASTWARD BY THE MIDDLE OF NEXT WEEK. THESE FEATURES WILL GUIDE S/WV ENERGY THRU A MEAN TROUGH OVER THE EAST CONUS. THIS TROUGH IS EXPECTED TO BECOME NEGATIVELY TILTED...LEADING TO THE REDEVELOPMENT OF A CLIPPER SYSTEM INVOF CAPE COD ON FRI...AND WILL BE FOLLOWED BY S/WV RIDGING FOR A BRIEF TIME OVER THE REGION ON SUNDAY. MEANWHILE...A PRIMARY S/WV ENTERS THE NORTHERN INTER- MOUNTAIN WEST ON SATURDAY ACCOMPANIED BY SEVERAL OTHER PIECES OF ENERGY EXTENDING FROM HUDSON`S BAY TO THE GULF COAST. THE DEGREE OF PHASING THESE FEATURES UNDERGO AS THEY TRAVERSE THE EAST CONUS TROUGH...AND REDEVELOPMENT INVOF THE EAST COAST...PRESENTS THE GREATEST UNCERTAINTY IN THIS FORECAST. AT THE D+5 TIME FRAME...IT/S TO EARLY TO LOCK ONTO ANY SPECIFICS...BUT THE NAO IS PROJECTED TO GO FROM NEGATIVE TO POSITIVE WHICH IS TYPICALLY FAVORABLE FOR EAST COAST CYCLOGENISIS. && .AVIATION /02Z THURSDAY THROUGH MONDAY/... THE FOLLOWING DISCUSSION IS FOR KPHL, KPNE, KTTN, KABE, KRDG, KILG, KMIV, KACY AND SURROUNDING AREAS. VFR CONDITIONS ARE EXPECTED OVERNIGHT AND ON THURSDAY. THE SKY WILL REMAIN CLEAR OVERNIGHT WITH AN INCREASE IN CIRRUS ON THURSDAY MORNING AND AN INCREASE IN MID LEVEL CLOUDS, WITH BASES AT OR ABOVE 10,000 FEET, DURING THE AFTERNOON. A LIGHT NORTHWEST TO NORTH WIND SHOULD BECOME LIGHT AND VARIABLE AT MOST LOCATIONS FOR LATE TONIGHT AND THURSDAY MORNING. A LIGHT SOUTHEAST WIND AROUND 4 TO 8 KNOTS IS ANTICIPATED TO DEVELOP FOR THURSDAY AFTERNOON. OUTLOOK... THURSDAY NIGHT THRU FRIDAY MORNING...MVFR/IFR IN LIGHT SNOW. FRIDAY AFTERNOON...CONDITIONS IMPROVING TO VFR. MVFR/IFR POSSIBLE IN SNOW SQUALLS. NW WINDS GUSTING AROUND 30 KT. FRI NIGHT...VFR WITH GUSTY NW WINDS EXPECTED TO CONTINUE. SATURDAY...VFR. SUNDAY AND MONDAY...LIGHT SNOW IS EXPECTED TO OVERSPREAD THE AREA LATE SUNDAY OR EARLY MONDAY...LOW CONFIDENCE ON TIMING. MVFR/IFR POSSIBLE IN THE SNOW. && .MARINE... THE SMALL CRAFT ADVISORY ON THE OCEAN IS IN EFFECT THROUGH 1 AM. WINDS ARE DIMINISHING AS THE PRESSURE GRADIENT WEAKENS ACROSS OUR AREA. SEAS ARE ALSO DECREASING. EXPECT BOTH WINDS AND SEAS TO FALL BELOW SMALL CRAFT ADVISORY CRITERIA ON OUR OCEAN WATERS LATER TONIGHT. LIGHT FREEZING SPRAY WILL REMAIN POSSIBLE THROUGH TONIGHT. SUB-ADVISORY CONDITIONS ARE EXPECTED FOR THURSDAY WITH LIGHT EASTERLY WINDS AND SEAS AROUND 2 TO 3 FEET ON THE OCEAN. OUTLOOK... THU NIGHT...WINDS AND SEAS MAY APPROACH SCA THRESHOLDS. FRI/FRI NIGHT...GALE FORCE WIND GUSTS INCREASINGLY LIKELY. SAT...GALE CONDITIONS DIMINISHING BACK TO SCA CONDITIONS. SUN...SUB SCA CONDITIONS EXPECTED. MON...WINDS AND SEAS MAY APPROACH SCA THRESHOLDS. && .PHI WATCHES/WARNINGS/ADVISORIES... PA...NONE. NJ...NONE. DE...NONE. MD...NONE. MARINE...SMALL CRAFT ADVISORY UNTIL 1 AM EST THURSDAY FOR ANZ450>455. && $$ SYNOPSIS...FRANCK NEAR TERM...IOVINO SHORT TERM...MEOLA LONG TERM...FRANCK/O`HARA AVIATION...FRANCK/IOVINO MARINE...FRANCK/MEOLA

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