Area Forecast Discussion
Issued by NWS Mt. Holly, NJ

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000
FXUS61 KPHI 231929
AFDPHI

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
329 PM EDT THU OCT 23 2014

.SYNOPSIS...
OFFSHORE LOW PRESSURE WILL STRENGTHEN AS IT CONTINUES TO GRADUALLY
TRACK NORTHEASTWARD TONIGHT, REACHING THE CANADIAN MARITIMES LATER
FRIDAY NIGHT. MEANWHILE, HIGH PRESSURE TO OUR SOUTHWEST WILL BUILD
TOWARD THE MID ATLANTIC FRIDAY AND SATURDAY, FOLLOWED BY A COLD
FRONT CROSSING THE REGION SATURDAY NIGHT. HIGH PRESSURE THEN BUILDS
ACROSS THE AREA LATER SUNDAY THROUGH MONDAY, EVENTUALLY MOVING
OFFSHORE TUESDAY. DEVELOPING LOW PRESSURE ACROSS THE PLAINS
STATES WILL ALLOW A WARM FRONT TO LIFT TO OUR NORTH MONDAY NIGHT AND
TUESDAY, FOLLOWED BY A COLD FRONT REACHING OUR AREA LATER WEDNESDAY.

&&

.NEAR TERM /UNTIL 6 AM FRIDAY MORNING/...
THE LOW WILL CONTINUE TO MOVE OUT TO SEA TONIGHT, PASSING WELL TO
THE SOUTHEAST OF CAPE COD. A MID LEVEL SHORT WAVE ROTATING AROUND
THE SYSTEM IS EXPECTED TO PASS OVERHEAD AROUND OR SHORTLY AFTER
MIDNIGHT.

THERE WAS NO PRECIPITATION INDICATED IN NORTHEASTERN MARYLAND OR
DELAWARE AT MID AFTERNOON. MOST OF THE REMAINING SHOWER ACTIVITY IN
OUR FORECAST AREA WAS OVER NEW JERSEY WITH SOME SPOTTY SHOWERS OVER
EXTREME SOUTHEASTERN PENNSYLVANIA AND THE POCONO REGION.

THE DRYING TREND WILL CONTINUE THIS EVENING AND OVERNIGHT AS THE LOW
CONTINUES TO MOVE FARTHER AWAY FROM OUR REGION. THE CLOUD COVER IS
EXPECTED TO REMAIN OVERHEAD DURING THE NIGHT WITH SOME BREAKS
POSSIBLE FROM ABOUT READING TO COATESVILLE TO DELAWARE BAY
SOUTHWESTWARD.

THE STATISTICAL GUIDANCE IS FAIRLY CLOSE WITH TONIGHT`S MINIMUM
TEMPERATURE FORECAST. READINGS SHOULD FALL MAINLY INTO THE 40S WITH
A NORTHWEST WIND AROUND 10 MPH.

&&

.SHORT TERM /6 AM FRIDAY MORNING THROUGH 6 PM FRIDAY/...
THE DRYING TREND WILL CONTINUE ON FRIDAY. GRADUAL CLEARING IS
EXPECTED FROM SOUTHWEST TO NORTHEAST. HOWEVER, SOME THIN CIRRUS FROM
THE WEST MAY OVERSPREAD OUR REGION DURING THE AFTERNOON.

THE NORTHWEST FLOW WILL PERSIST. SUSTAINED WIND SPEEDS ARE FORECAST
TO BE AROUND 10 TO 15 MPH WITH GUSTS NEAR 20 MPH.

THE INCREASING SUNSHINE ON FRIDAY SHOULD BRING AFTERNOON
TEMPERATURES UP TO NORMAL LEVELS FOR OCTOBER 24.

&&

.LONG TERM /FRIDAY NIGHT THROUGH THURSDAY/...
RELATIVELY QUIET WEATHER WILL START OFF THE LONG TERM PERIOD, AS
SURFACE AND UPPER LEVEL LOW PRESSURE REACH THE NOVA SCOTIA AREA
FRIDAY NIGHT AND SURFACE HIGH PRESSURE SPREADS INTO OUR REGION FROM
THE TENNESSEE VALLEY. WEST-NORTHWEST WINDS WILL DIMINISH ACROSS THE
FORECAST AREA AS THE PRESSURE GRADIENT RELAXES, AND OTHER THAN A FEW
CLOUDS ASSOCIATED WITH A SHORTWAVE MOVING OVERHEAD, A QUIET NIGHT IS
EXPECTED. FOR THE MOST PART, MINIMUM TEMPERATURES WILL BE A LITTLE
COOLER THAN RECENT NIGHTS, WITH LOWS MAINLY IN THE LOWER TO MID 40S
FOR THE AREA, EXCEPT SOME UPPER 30S ACROSS OUR NORTHERN ZONES.

FOR SATURDAY, THE PREVIOUSLY MENTIONED HIGH PRESSURE TO OUR
SOUTHWEST WILL CONTINUE TO INFLUENCE OUR REGION THROUGH THE DAYTIME;
ALTHOUGH, A COLD FRONT AND UPPER-LEVEL TROUGH WILL BE APPROACHING
OUR AREA FROM AROUND THE GREAT LAKES BY SATURDAY EVENING. WE
MAINTAIN A DRY FORECAST FOR SATURDAY WITH AMPLE SUNSHINE AND
PLEASANT DAYTIME TEMPS INTO THE 60S FOR THE REGION, AND WE ALSO KEPT
A SLIGHT CHANCE FOR SHOWERS IN THE PICTURE FOR OUR FAR NORTHERN
ZONES INTO SATURDAY NIGHT AS THE COLD FRONT AND TROUGH PASS THROUGH
THE AREA. ANY SHOWER ACTIVITY SHOULD BE MINIMAL, THOUGH, AS THERE IS
LIMITED MOISTURE AND MOST OF THE UPPER LEVEL ENERGY PASSES BY TO OUR
NORTH. GOING INTO SUNDAY, AN UPPER LEVEL LOW AND SURFACE LOW
PRESSURE ARE EXPECTED TO REMAIN ACROSS THE NEW ENGLAND STATES AND
SOUTHEAST CANADA, WHILE SURFACE HIGH PRESSURE TO OUR SOUTH AND WEST
AGAIN BUILDS TOWARD THE MID ATLANTIC REGION. WE WILL BE PRECIP-FREE
WITH AMPLE SUN, BUT A TIGHTENING PRESSURE GRADIENT WILL MAKE FOR A
BREEZY SUNDAY, WITH NORTHWEST WINDS IN THE 15 TO 20 MPH RANGE AND
GUSTING AT TIMES UPWARDS OF 25 MPH.

SURFACE HIGH PRESSURE WILL CONTINUE TO BUILD ACROSS THE REGION
MONDAY, WITH AN UPPER LEVEL RIDGE BUILDING OVERHEAD. THIS PATTERN
WILL ALLOW FOR SOME MODERATING TEMPERATURES ACROSS OUR FORECAST
AREA, ESPECIALLY INTO TUESDAY AS THE HIGH PRESSURE MOVES OFFSHORE
AND A WARM FRONT LIFTS NORTH OF THE REGION. USING A BLEND OF WPC
GUIDANCE WITH CONTINUITY, WE EXPECT TUESDAY`S MAX TEMPS TO REACH THE
UPPER 60S TO LOW 70S FOR THE FORECAST AREA. A RATHER PROGRESSIVE
PATTERN CONTINUES INTO WEDNESDAY AS THE UPPER RIDGE MOVES OFFSHORE,
WITH A COLD FRONT APPROACHING OUR REGION FROM THE WEST AND ITS
ASSOCIATED LOW PRESSURE LIFTING NORTH FROM THE UPPER MIDWEST AND
GREAT LAKES INTO SOUTHERN CANADA. WE HAVE KEPT SOME LOW CHANCE POPS
FOR SHOWERS IN THE FORECAST FOR WEDNESDAY TO WEDNESDAY EVENING AS
THE FRONT CROSSES THE AREA; ALTHOUGH, MUCH OF THE UPPER LEVEL
SUPPORT AND FORCING WITH THIS SYSTEM LOOKS TO PASS BY TO OUR NORTH.
WITH THE FRONT OFFSHORE INTO THURSDAY, WEAK HIGH PRESSURE MAY BUILD
TOWARD THE REGION. THURSDAY LOOKS TO BE A BIT COOLER WITH DAYTIME
TEMPERATURES CLOSER TO AVERAGE, MAINLY IN THE 60S.

&&

.AVIATION /20Z THURSDAY THROUGH TUESDAY/...
THE FOLLOWING DISCUSSION IS FOR KPHL, KPNE, KTTN, KABE, KRDG, KILG,
KMIV, KACY AND SURROUNDING AREAS.

AREAS OF MVFR CEILINGS (WITH BASES AROUND 2000 TO 3000 FEET) ARE
EXPECTED TO LINGER OVER OUR REGION INTO THIS EVENING, ESPECIALLY
AROUND KABE, KTTN AND KACY. OTHERWISE VFR CEILINGS ARE ANTICIPATED
THOUGH TONIGHT AND INTO FRIDAY MORNING. GRADUAL CLEARING FROM THE
SOUTHWEST IS EXPECTED FOR FRIDAY.

A NORTHWEST WIND AROUND 12 TO 16 KNOTS WITH GUSTS INTO THE 20S IS
FORECAST INTO THIS EVENING. A NORTHWEST WIND AROUND 8 TO 12 KNOTS IS
EXPECTED FOR TONIGHT. THE NORTHWEST WIND WILL LIKELY CONTINUE ON
FRIDAY WITH SPEEDS AROUND 10 TO 15 KNOTS AND GUSTS AROUND 20 KNOTS.

OUTLOOK...
FRIDAY NIGHT...VFR CONDITIONS WITH WEST-NORTHWEST WINDS UNDER 10
KNOTS.

SATURDAY...VFR CONDITIONS. ISOLATED SHWRS ARE POSSIBLE SATURDAY
EVE/NIGHT WITH A COLD FRONT, MAINLY AFFECTING NORTHERN NJ AND THE
POCONOS.

SUNDAY...VFR CONDITIONS ARE EXPECTED WITH GUSTY NORTHWEST WINDS AT
15 TO 25 KNOTS.

MONDAY AND TUESDAY...VFR CONDITIONS WITH WEST TO SOUTHWEST WINDS
UNDER 10 KNOTS.

&&

.MARINE...
WIND SPEEDS WERE DECREASING VERY SLOWLY THIS AFTERNOON. WE WILL LET
THE GALE WARNING PLAY ITSELF OUT UNTIL 600 PM ALTHOUGH CONDITIONS
ARE MARGINAL AT MANY LOCATIONS. SMALL CRAFT ADVISORY CONDITIONS ARE
LIKELY FOR TONIGHT AND FRIDAY AS LOW PRESSURE WELL OFF THE COAST
MOVES SLOWLY TOWARD NOVA SCOTIA AND AWAY FROM OUR REGION.

WAVE HEIGHTS ON OUR OCEAN WATERS REMAINED IN THE 6 TO 10 FOOT RANGE
AT MID AFTERNOON. THE WAVES ARE EXPECTED TO SUBSIDE SLOWLY DURING
TONIGHT AND FRIDAY.

OUTLOOK...
FRIDAY NIGHT AND SATURDAY...CONDITIONS ARE ANTICIPATED TO BE AT
SUB-ADVISORY LEVELS AT THIS TIME, BUT SOME WIND GUSTS AROUND 20
KNOTS ARE EXPECTED.

SUNDAY...SMALL CRAFT ADVISORY CRITERIA WILL LIKELY BE MET FOR OUR
COASTAL WATERS AND DELAWARE BAY, WITH NORTHWEST WINDS GUSTING INTO
THE 25 TO 30 KNOT RANGE.

MONDAY AND TUESDAY...SUB-ADVISORY CONDITIONS ARE EXPECTED.

&&

.PHI WATCHES/WARNINGS/ADVISORIES...
PA...NONE.
NJ...NONE.
DE...NONE.
MD...NONE.
MARINE...GALE WARNING UNTIL 6 PM EDT THIS EVENING FOR ANZ431-450>455.
     SMALL CRAFT ADVISORY UNTIL 6 PM EDT FRIDAY FOR ANZ430.

&&

$$
SYNOPSIS...KLINE
NEAR TERM...IOVINO
SHORT TERM...IOVINO
LONG TERM...KLINE
AVIATION...IOVINO/KLINE
MARINE...IOVINO/KLINE






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