Special Weather Statement, NWS Philadelphia/Mount Holly

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
724 PM EDT FRI SEP 30 2011

.SYNOPSIS...
ANOTHER STRONG COLD FRONT WILL SWEEP THROUGH THE REGION. THE
ASSOCIATED UPPER LEVEL LOW PRESSURE WILL MOVE TO OUR NORTHEAST AND
PINWHEEL A FEW TIMES THROUGH THE WEEKEND. THE COLD FRONT APPEARS TO
STALL OFFSHORE ON SATURDAY WHEN A COASTAL LOW FORMS AND RIDES ALONG
THIS BOUNDARY ON SATURDAY. FINALLY HIGH PRESSURE MOVING IN FROM THE
WEST WILL KICK THE STALLED FRONT AND UPPER LEVEL LOW TO OUR
NORTHEAST EARLY NEXT WEEK. MORE BENIGN WEATHER FOLLOWS AS THE LOW
LEAVES THE REGION.

&&

.NEAR TERM /UNTIL 6 AM SATURDAY MORNING/...
THE INSTABILITY AXIS OUT AHEAD OF THE SURFACE COLD FRONT IS
ALLOWING LOW TOPPED CONVECTION TO DEVELOP FROM NORTHEAST MARYLAND
ACROSS CENTRAL AND SOUTHERN DELAWARE. THE DECAYING SEA BREEZE
BOUNDARY IS ALSO ACTING AS A FOCUS FOR THE INSTABILITY.

THE BEST MLCAPE SLIVER EXTENDS ACROSS CENTRAL AND SOUTHERN
DELAWARE INTO CENTRAL AND SOUTHERN NEW JERSEY. BULK SHEAR IS ALSO
ADEQUATE FOR ORGANIZED...BUT FOR NOW IT APPEARS AS THOUGH THE TIME
OF DAY MAY BE WORKING AGAINST BETTER ORGANIZATION. THE SHOWER AND
THUNDERSTORM CHANCES WERE UPPED A BIT IN THE GRIDDED AND TEXT
FORECASTS.  ENHANCED WORDING WAS NOT ADDED AT THIS JUNCTURE AS
THE BEST INSTABILITY SHOULD SOON BE WANING.

ENERGY ROTATING AROUND THE MID LEVEL VORTEX DROPPING TOWARD
VIRGINIA IS SUPPOSED TO CAUSE LOW PRESSURE TO DEVELOP ALONG THE
FRONT AFTER IT MOVES OFF THE COAST, AND GIVEN THE STRENGTH OF THE
UPPER JET ASSOCIATED WITH THE ENERGY THAT SEEMS ON TARGET. THERE
IS INCREASING H8 THETA E ADVECTION AND I295 ISENTROPIC LIFT
DEVELOPING NORTHEAST LATE TONIGHT, AND SO THE SECOND PART OF THE NIGHT
CARRIES HIGHEST POPS THERE WITH POPS DROPPING FROM LIKELY TO
CHANCE AS ONE MOVES SOUTHWEST THROUGH THE FORECAST AREA. THUNDER
MAINLY LOOKS TO BE CONFINED TO OFF THE COAST.

THE TEMPERATURE FORECAST IS A COMPROMISE BETWEEN COOLER CONTINUITY
AND THE MILDER STAT GUIDANCE.

&&

.SHORT TERM /6 AM SATURDAY MORNING THROUGH 6 PM SATURDAY/...
THE CONTINUED INDICATIONS ARE THAT THE BEST FORCING OVER OUR
FORECAST AREA OCCURS NORTHWEST AS THE MID LEVEL LOW MOVES TO THE
VIRGINIA NORTHERN NECK AND THE SURFACE LOW ALONG THE FRONT ENDS UP
NEAR LONG ISLAND. MID LEVEL Q-VECTOR CONVERGENCE, LOWER LEVEL
FRONTOGENESIS, DIFFERENTIAL DIVERGENCE, ISENTROPIC LIFT AND
UPSLOPING ALL ARE FAVORED NORTHWEST. THE ATMOSPHERE DOESN'T
APPEAR TO BE TERRIBLY MOIST (H8 DEW POINTS JUST A BIT ABOVE 5 DEG
C), BUT WITH ISOLATED FFG VALUES OF AROUND 0.5 INCHES IN THE
NORTHWEST WE HAVE MAINTAINED THE WORDING IN THE HWO. POPS RANGE
FROM CATEGORICAL NORTHWEST TO LOW CHANCE FAR SOUTH. MUCAPES LOOK
PRETTY LOW, SO WE AREN'T CARRYING ANY THUNDER WITH THIS PACKAGE.

ON TEMPERATURES, WE WENT BELOW GUIDANCE NORTHWEST WHERE WE EXPECT
THE MOST CLOUDINESS AND RAINFALL, AND THEN MOVED TOWARD GUIDANCE
AS WE MOVED SOUTHEAST.

&&

.LONG TERM /SATURDAY NIGHT THROUGH FRIDAY/...
THIS TIME PERIOD BEGINS WITH AN ANOMALOUSLY DEEP MID-LEVEL CLOSED
LOW OVER OUR AREA. NUMERICAL GUIDANCE OVER THE PAST 12 HOURS HAS
TRENDED TOWARD SLOWER MOVEMENT OF THE CLOSED LOW OUT OF THE REGION.
AS A RESULT, THIS FORECAST UPDATE RAISED POPS FOR THE SUNDAY INTO
MONDAY TIMEFRAME.  THROUGH PRECIPITATION WAS KEPT AS SHOWERS, THE
VERY COLD AIR ALOFT WILL BE CONDUCIVE TO ENHANCED DAYTIME
CONVECTION.  ISOLATED THUNDERSTORM ACTIVITY IS POSSIBLE, AND THE
UNUSUALLY LOW FREEZING LEVEL MAY RESULT IN SOME HAIL WITH THE
STRONGEST CONVECTION. TEMPERATURES ARE BELOW SEASONAL NORMS,
PARTICULARLY IN THE DAYTIME.

CONDITIONS DRY OUT AS WE MOVE INTO TUESDAY AND THE TEMPERATURES FOR
THE REMAINDER OF THE PERIOD ARE NEAR NORMAL.  OF COURSE THIS IS
CONTINGENT ON THE CUTOFF LOW LIFTING OUT AS SCHEDULED.  THIS IS A
LOW CONFIDENCE SCENARIO.

&&

.AVIATION /23Z FRIDAY THROUGH WEDNESDAY/...
VFR CONDITIONS CONTINUE EARLY THIS EVENING. AN AREA OF SHOWERS AND
THUNDERSTORMS THAT DEVELOPED ON AN INSTABILITY AXIS AHEAD OF A COLD
FRONT COULD IMPACT KACY (AND TO A LESSER EXTENT KMIV) THROUGH 0200
UTC. THE ABOVEMENTIONED LOCATIONS HAVE A CB REMARK FOR THE CONVECTIVE
POTENTIAL...BUT THE KACY TERMINAL FORECAST MAY NEED TO BE UPDATED
AS THUNDER BECOMES IMMINENT.

AS THE AREA MOVES NORTHEAST LATE THIS EVENING...THERE COULD BE A
LULL IN PRECIPITATION AS THE FRONT MOVES OFFSHORE...AND LOW
PRESSURE TRYING TO ORGANIZE OVER THE CAROLINAS DEVELOPS. THE
NORTHERLY FLOW BEHIND THE FRONT AND AHEAD OF THE LOW COULD TRAP
LOW LEVEL MOISTURE UNDER THE INVERSION. THIS IS HINTED AT IN THE
TERMINAL FORECASTS LATE TONIGHT...THEN INTRODUCED INTO THE
FORECASTS AFTER 1100 UTC AS MVFR CEILINGS.

THERE IS STILL A FAIR AMOUNT OF SPREAD ON JUST HOW MUCH THE
SURFACE LOW DEVELOPING ON THE FRONT THIS EVENING HAS ON THE AREA.
FOR NOW...BASED ON THE EXPECTED OVERRUNNING OF THE COOLER AIR IN
PLACE AT THE SURFACE...THE BEST CHANCE OF MVFR CONDITIONS WERE
PLACED IN THE FORECASTS FOR KABE AND KRDG FOR SATURDAY. FURTHER
SOUTH AND EAST...IT IS NOT CLEAR JUST HOW FAST THE RAIN AFFECTS
THE OTHER TERMINAL FORECAST SITES. HOWEVER...MVFR CEILINGS LOOK
AS THOUGH THEY WILL CONTINUE INTO MOST OF SATURDAY.

OUTLOOK...
MVFR CONDITIONS COULD LINGER INTO MONDAY IN RAIN. VFR CONDITIONS
ARE FORECAST AFTER THAT.

&&

.MARINE...
THE FRONTAL PASSAGE ITSELF IS NOT EXPECTED TO CAUSE WINDS OR SEAS
TO RISE TO ADVISORY LEVELS, BUT THE SURFACE LOW SHOULD EVENTUALLY
STRENGTHEN ENOUGH TO CAUSE ADVISORY CONDITIONS. WE START THEM
SATURDAY NIGHT AND CARRY THEM INTO SUNDAY FOR NOW. THEY MAY LINGER
BEYOND OUR PRESENT END TIME OF NOON EDT SUNDAY. CONDITIONS ARE
EXPECTED TO GO SUB-ADVISORY BY MONDAY EVENING.

&&

.HYDROLOGY...
AS NOTED ABOVE, GIVEN THAT QPF VALUES IN THE NORTH REACH SOME OF
THE LOWEST GRIDDED FFG VALUES, WE MAINTAIN THE WORDING FOR
POSSIBLE POOR DRAINAGE AND SMALL STREAM FLOODING.

&&

.TIDES/COASTAL FLOODING...
TIDE DEPARTURES NEAR ONE FOOT SHOULD ALLOW CAMBRIDGE TO SEE THE
HIGH TIDE CYCLE REACH THE MINOR TIDAL FLOODING BENCHMARK THIS
EVENING. MINOR TIDAL FLOODING APPEARS TO BE LESS LIKELY FURTHER
NORTH ALONG THE EASTERN SHORE OF THE CHESAPEAKE BAY...BUT STILL
CLOSE ENOUGH FOR A COASTAL FLOOD ADVISORY.

&&

.PHI WATCHES/WARNINGS/ADVISORIES...
PA...NONE.
NJ...NONE.
DE...NONE.
MD...COASTAL FLOOD ADVISORY UNTIL 11 PM EDT THIS EVENING FOR MDZ012-
     015-019-020.
MARINE...SMALL CRAFT ADVISORY FROM 6 PM SATURDAY TO NOON EDT SUNDAY FOR
     ANZ450>455.

&&

SYNOPSIS...SZATKOWSKI
NEAR TERM...DELISI/HAYES
SHORT TERM...DELISI
LONG TERM...SZATKOWSKI
AVIATION...DELISI/SZATKOWSKI/HAYES
MARINE...DELISI/SZATKOWSKI
HYDROLOGY...DELISI
TIDES/COASTAL FLOODING...HAYES

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
706 PM EDT FRI SEP 30 2011

NJZ001-007>010-PAZ054-055-061-062-012315-
SUSSEX-WARREN-MORRIS-HUNTERDON-SOMERSET-CARBON-MONROE-LEHIGH-
NORTHAMPTON-
706 PM EDT FRI SEP 30 2011

THIS HAZARDOUS WEATHER OUTLOOK IS FOR NORTHERN NEW
JERSEY...NORTHWEST NEW JERSEY...EAST CENTRAL PENNSYLVANIA AND
NORTHEAST PENNSYLVANIA.

.DAY ONE...TONIGHT.

NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME.

.DAYS TWO THROUGH SEVEN...SATURDAY THROUGH THURSDAY.

MORE RAIN IS POSSIBLE ON SATURDAY WHICH MAY CAUSE POOR DRAINAGE
AND SMALL STREAM FLOODING.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION IS NOT EXPECTED AT THIS TIME.

MDZ012-015-019-020-012315-
KENT MD-QUEEN ANNES-TALBOT-CAROLINE-
706 PM EDT FRI SEP 30 2011

...COASTAL FLOOD ADVISORY IN EFFECT UNTIL 11 PM EDT THIS EVENING...

THIS HAZARDOUS WEATHER OUTLOOK IS FOR NORTHEAST MARYLAND.

.DAY ONE...TONIGHT.

PLEASE LISTEN TO NOAA WEATHER RADIO OR GO TO WEATHER.GOV ON THE
INTERNET FOR MORE INFORMATION ABOUT THE FOLLOWING HAZARDS.

   COASTAL FLOOD ADVISORY.

.DAYS TWO THROUGH SEVEN...SATURDAY THROUGH THURSDAY.

NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION IS NOT EXPECTED AT THIS TIME.

DEZ001>004-MDZ008-NJZ012>027-PAZ060-067>071-012315-
NEW CASTLE-KENT-INLAND SUSSEX-DELAWARE BEACHES-CECIL-MIDDLESEX-
WESTERN MONMOUTH-EASTERN MONMOUTH-MERCER-SALEM-GLOUCESTER-CAMDEN-
NORTHWESTERN BURLINGTON-OCEAN-CUMBERLAND-ATLANTIC-CAPE MAY-
ATLANTIC COASTAL CAPE MAY-COASTAL ATLANTIC-COASTAL OCEAN-
SOUTHEASTERN BURLINGTON-BERKS-CHESTER-MONTGOMERY-BUCKS-DELAWARE-
PHILADELPHIA-
706 PM EDT FRI SEP 30 2011

THIS HAZARDOUS WEATHER OUTLOOK IS FOR CENTRAL DELAWARE...NORTHERN
DELAWARE...SOUTHERN DELAWARE...NORTHEAST MARYLAND...CENTRAL NEW
JERSEY...NORTHERN NEW JERSEY...SOUTHERN NEW JERSEY...EAST CENTRAL
PENNSYLVANIA AND SOUTHEAST PENNSYLVANIA.

.DAY ONE...TONIGHT.

NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME.

.DAYS TWO THROUGH SEVEN...SATURDAY THROUGH THURSDAY.

NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION IS NOT EXPECTED AT THIS TIME.

ANZ430-431-450>455-012315-
DELAWARE BAY WATERS NORTH OF EAST POINT NJ TO SLAUGHTER BEACH DE-
DELAWARE BAY WATERS SOUTH OF EAST POINT NJ TO SLAUGHTER BEACH DE-
COASTAL WATERS FROM SANDY HOOK TO MANASQUAN INLET NJ OUT 20 NM-
COASTAL WATERS FROM MANASQUAN INLET TO LITTLE EGG INLET NJ OUT 20 NM-
COASTAL WATERS FROM LITTLE EGG INLET TO GREAT EGG INLET NJ OUT 20 NM-
COASTAL WATERS FROM GREAT EGG INLET TO CAPE MAY NJ OUT 20 NM-
COASTAL WATERS FROM CAPE MAY NJ TO CAPE HENLOPEN DE OUT 20 NM-
COASTAL WATERS FROM CAPE HENLOPEN TO FENWICK ISLAND DE OUT 20 NM-
706 PM EDT FRI SEP 30 2011

THIS HAZARDOUS WEATHER OUTLOOK IS FOR ATLANTIC COASTAL WATERS AND
DELAWARE BAY WATERS.

.DAY ONE...TONIGHT.

NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME.

.DAYS TWO THROUGH SEVEN...SATURDAY THROUGH THURSDAY.

NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION IS NOT EXPECTED AT THIS TIME.

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
725 PM EDT FRI SEP 30 2011

DEZ003-004-010000-
DELAWARE BEACHES DE-INLAND SUSSEX DE-
725 PM EDT FRI SEP 30 2011

...A STRONG THUNDERSTORM AFFECTING SUSSEX COUNTY...

AT 720 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
STRONG THUNDERSTORM 7 MILES NORTHEAST OF GEORGETOWN...MOVING
NORTHEAST AT 30 MPH. THE THUNDERSTORM WILL BE NEAR DEWEY BEACH AROUND
730 PM...LEWES AROUND 735 PM AND CAPE HENLOPEN STATE PARK AROUND 740
PM.

WIND GUSTS TO 40 MPH ARE POSSIBLE WITH THIS STORM. BRIEF HEAVY RAIN
CAN ALSO BE EXPECTED.

LAT...LON 3845 7542 3879 7543 3893 7531 3889 7525
      3886 7523 3880 7516 3879 7511 3881 7509
      3880 7507 3874 7507 3865 7505 3863 7506
      3860 7504 3847 7504

FORECASTER:JJM

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
745 PM EDT FRI SEP 30 2011

NJZ023-024-010045-
ATLANTIC COASTAL CAPE MAY NJ-CAPE MAY NJ-
745 PM EDT FRI SEP 30 2011

...A STRONG THUNDERSTORM WILL AFFECT CAPE MAY COUNTY...

AT 742 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
STRONG THUNDERSTORM 12 MILES WEST OF CAPE MAY...MOVING NORTHEAST AT
40 MPH. THE THUNDERSTORM WILL BE NEAR WHITESBORO-BURLEIGH...VILLAS
AROUND 800 PM...CAPE MAY COURT HOUSE...SCOTCH BONNET AROUND 815 PM...
SEA ISLE CITY AND STRATHMERE AROUND 830 PM.

WIND GUSTS TO 40 MPH ARE POSSIBLE WITH THIS STORM. BRIEF HEAVY
DOWNPOURS ARE ALSO POSSIBLE.

LAT...LON 3925 7459 3920 7464 3908 7472 3892 7492
      3892 7497 3899 7498 3911 7490 3915 7490
      3920 7493 3922 7490 3929 7489 3928 7468
      3929 7466 3929 7455 3928 7455

FORECASTER:JJM