Area Forecast Discussion
Issued by NWS Mt. Holly, NJ

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000 FXUS61 KPHI 211423 AFDPHI AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE MOUNT HOLLY NJ 1023 AM EDT SUN SEP 21 2014 .SYNOPSIS... LOW PRESSURE OFF THE CAROLINA COAST WILL MOVE NORTHEAST OFF THE MID-ATLANTIC COAST TODAY WHILE A COLD FRONT APPROACHES FROM THE WEST. THE FRONT IS EXPECTED TO MOVE THROUGH THE MID-ATLANTIC STATES TONIGHT. HIGH PRESSURE BUILDING IN FROM THE MIDWEST EARLY IN THE WEEK WILL PERSIST OVER THE AREA THROUGH THE END OF THE WEEK. && .NEAR TERM /UNTIL 6 PM THIS EVENING/...
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PLENTY OF LOW LEVEL MOISTURE LINGERING ACROSS THE REGION THIS MORNING. THE MOISTURE IS RATHER SHALLOW...SO WHEN IT MIXES OUT BY EARLY THIS AFTERNOON...TEMPERATURES SHOULD RISE RATHER QUICKLY. WE WILL HOLD ONTO THE MAX TEMP FCST FROM EARLIER. LOW PRESSURE OFF THE DELMARVA WILL CONTINUE TO MOVE NORTHEAST...AND IT APPEARS THE RAIN SHIELD WILL STAY OFFSHORE...JUST TO THE EAST OF THE COASTAL WATERS. LOW PRESSURE WILL ALSO MOVE TO THE NORTH AND ITS ASSOCIATED COLD FRONT WILL MOVE TOWARD THE AREA FROM THE WEST. ONLY SLGT CHC OF SMALL CHC POPS ACROSS THE NRN/WRN AREAS. ADDED SLGT CHC THUNDER N/W. PUBLIC PRODUCTS UPDATED JUST AFTER 10 AM.
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&& .SHORT TERM /6 PM THIS EVENING THROUGH 6 AM MONDAY/... THE COLD FRONT WILL BE THE FEATURE IMPACTING OUR AREA TONIGHT. THE FRONT WILL MOVE INTO THE AREA THIS EVENING AND THEN SLOWLY PUSH ITS WAY THROUGH, MAKING ITS WAY OFFSHORE BY LATE TONIGHT OR EARLY MONDAY. THE FRONT WILL HAVE SOME SHOWERS ASSOCIATED WITH IT AND MAYBE A FEW RUMBLES OF THUNDER, ALTHOUGH INSTABILITY DOES NOT LOOK AT ALL IMPRESSIVE. WITH THE SUN SETTING EARLIER AT THIS TIME OF YEAR, WE WILL LOSE SOME OF THE OOMPH NEEDED TO HELP PRODUCE THUNDERSTORMS. THE FRONT MOVES OFFSHORE LATE TONIGHT AND WE WILL SEE A WIND SHIFT TO THE NORTHWEST OCCUR. COOLER AIR WILL START TO MOVE IN TOWARD MORNING BUT WILL NOT ARRIVE IN TIME TO IMPACT OVERNIGHT TEMPS. EXPECT LOWS TO BE IN THE 50S TO LOWER 60S ACROSS THE REGION. && .LONG TERM /MONDAY THROUGH SATURDAY/... RATHER BENIGN WEATHER IS EXPECTED THROUGH THE ENTIRE EXTENDED FORECAST PERIOD OF MONDAY THRU SATURDAY. THE COLD FRONT FORECAST TO MOVE ACROSS THE AREA TONIGHT SHOULD BE OFF THE MID-ATLANTIC COAST BY MONDAY MORNING. HIGH PRESSURE BUILDING IN FROM THE WEST BEHIND THE FRONT ON MON AND TUE IS EXPECTED TO STRENGTHEN OVER NEW ENGLAND BY WED AND THU...AND THEN SHIFT SLIGHTLY WEST TO THE LOWER GRTLKS AND MID-ATLANTIC BY FRI/SAT. MEANWHILE AN UPPER TROF OVER THE ERN US ON MONDAY WILL GIVE WAY TO AN UPPER RIDGE BUILDING OVER THE REGION BY MID WEEK AND CONTINUING INTO NEXT WEEKEND. THE 12Z ECMWF SHOWED AN UPPER LOW DEVELOPING OVER THE MID-ATLANTIC BY THE LATTER PART OF THE WEEK. HWVR THIS SOLN SEEMS TO BE OUT OF LINE WITH OTHER MODELS INCLUDING THE EURO ENSEMBLE...ACCORDING TO WPC...AND NOW THE NEW 00Z ECMWF SHOWS MORE OF A WEAKNESS IN THE UPPER RIDGE RATHER THAN A CLOSED LOW. STILL...WITH EASTERLY/ONSHORE FLOW AROUND THE NEW ENGLAND HIGH PRES...HAVE ACCEPTED WPC POPS OVER DELMARVA AND SRN NJ FOR THU AND THU NIGHT...BUT WITH A SMALL DOWNWARD ADJUSTMENT. LOW-LEVEL COLD ADVECTION WILL BE IN PLACE FOR MON AND TUE BUT SHOULD BECOME NEUTRAL BY MID-WEEK...WITH A WARMING TREND BY WEEKS END. && .AVIATION /14Z SUNDAY THROUGH THURSDAY/...
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THE FOLLOWING DISCUSSION IS FOR KPHL, KPNE, KTTN, KABE, KRDG, KILG, KMIV, KACY AND SURROUNDING AREAS. TODAY...VERY SLOW IMPROVEMENT IN CIGS/VSBYS THROUGH THE REST OF THE MORNING. VERY LIGHT WINDS. HOPEFULLY VFR BY MID AFTERNOON. WINDS WILL SWING AROUND TO SW ACROSS THE DEL VALLEY LATE 5 TO 10 KTS. TONIGHT...A COLD FRONT WILL CROSS THE REGION TONIGHT. WINDS WILL SHIFT FROM THE SOUTHWEST TO THE NORTHWEST BEHIND THE FRONTAL PASSAGE. THERE IS A CHANCE FOR SOME SCATTERED SHOWERS AHEAD OF AND ALONG THE COLD FRONT. BEST CHANCES ARE LATER THIS AFTERNOON THROUGH THIS EVENING. OUTLOOK... MONDAY...NW WIND GUSTS AROUND 20 KT ARE POSSIBLE MONDAY IN ASSOCIATION WITH HIGH PRESSURE BUILDING IN BEHIND A COLD FRONT. SOME STRATO-CU MAY DEVELOP IN THIS SETUP, WHICH COULD MAY RESULT IN A PERIOD MVFR CIGS, MOST LIKELY FOR RDG/ABE TERMINALS. MONDAY NIGHT THROUGH THURSDAY...VFR AND LIGHT WINDS EXPECTED.
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&& .MARINE...
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SMALL CRAFT ADVISORY DROPPED DURING THE MID MORNING. SEAS WILL CONTINUE TO SUBSIDE THROUGH THIS AFTERNOON BEFORE STARTING TO RAMP UP AGAIN AS LOW PRESSURE PASSES TO THE EAST OF OUR AREA WATERS. SHOWERS WITH EMBEDDED THUNDERSTORMS, ASSOCIATED WITH THE LOW PRESSURE SYSTEM TO OUR SOUTH, WILL CONTINUE TO MOVE THROUGH THE WATERS THIS MORNING. EXPECT THEM TO GRADUALLY MOVE NORTH AND EAST AS THE LOW MAKES ITS WAY UP THE MIDDLE ATLANTIC COAST. OUTLOOK... MONDAY AND MONDAY NIGHT...A COLD FRONT WILL MOVE THRU THE WATERS EARLY MONDAY MORNING RESULTING IN A WIND SHIFT FROM SW TO NW. POST- FRONTAL NW WINDS OF 15-20 KT GENERALLY EXPECTED BUT CANNOT RULE OUT LOCALLY STRONGER GUSTS ON MONDAY INTO MONDAY NIGHT. WITH THE NW FLOW SEAS COULD BUILD UP TO 5 FEET WELL OFFSHORE. HOWEVER THIS IS NOT CERTAIN AND WITH SCA CURRENTLY IN EFFECT AND A LULL EXPECTED THIS AFTN/EVE...WILL NOT ISSUE ANOTHER SCA AT THIS TIME. TUESDAY THROUGH THURSDAY...SUB-SCA CONDITIONS EXPECTED FOR TUE AND WED BUT INCREASING EAST FLOW BY THU COULD BUILD SEAS TO NEAR 5 FEET... ESPECIALLY CAPE MAY AND SOUTH.
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&& .PHI WATCHES/WARNINGS/ADVISORIES...
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PA...NONE. NJ...NONE. DE...NONE. MD...NONE. MARINE...NONE.
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&& $$ SYNOPSIS...AMC NEAR TERM...PO SHORT TERM...MEOLA LONG TERM...AMC AVIATION...AMC/MEOLA/PO MARINE...AMC/MEOLA/PO

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