141
FXUS61 KPHI 240509
AFDPHI
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
1209 AM EST MON NOV 24 2025
SYNOPSIS
A HIGH PRESSURE SYSTEM MOVES IN FOR TONIGHT THROUGH TUESDAY
MORNING. OUR NEXT FRONTAL SYSTEM ARRIVES FOR MID-WEEK. HIGH
PRESSURE TAKES OVER IN THE WAKE OF THE FRONTAL SYSTEM FOR THE
END OF THE WEEK AND BEGINNING OF THE WEEKEND WHICH RESULTS IN
DRY BUT WINDY AND COLD CONDITIONS.
NEAR TERM /THROUGH TODAY/
THE BASE OF AN H5 TROUGH WITH STRONG SHORTWAVE ENERGY IS PUSHING
OFFSHORE AT THIS HOUR. AS THIS TROUGH DEPARTS, ITS WILL DRAG A
COLD FRONT THROUGH THE REGION. HIGH PRESSURE THEN BUILDS INTO
THE OHIO AND TENNESSEE VALLEYS BEFORE MOVING OFF THE MID-
ATLANTIC COAST LATE MONDAY.
DESPITE CLEARING SKIES, WINDS SHOULD BE ELEVATED ENOUGH TO KEEP
OPTIMAL RADIATIONAL COOLING CONDITIONS FROM DEVELOPING. NOT
MUCH COLD AIR ADVECTION BEHIND THIS FRONT. LOWS WILL BE IN THE
LOW TO MID 30S.
THERE MAY BE A QUICK SURGE IN NORTHWEST WINDS MONDAY MORNING
AFTER SUNRISE, GENERALLY 10 TO 15 MPH WITH GUSTS UP TO 20 MPH.
WINDS SHOULD SETTLE DOWN IN THE AFTERNOON AND BACK TO THE WEST
AS HIGH PRESSURE BUILDS EAST. GENERALLY PARTLY TO MOSTLY SUNNY
SKIES WITH HIGHS IN THE LOW TO MID 50S.
SHORT TERM /TONIGHT THROUGH WEDNESDAY NIGHT/
WE START THE SHORT TERM PERIOD TRANQUIL WITH A HIGH PRESSURE SYSTEM
OVERHEAD MONDAY NIGHT BUT IT DOES MOVE OFFSHORE ON TUESDAY. CLOUDS
DO INCREASE MONDAY NIGHT AHEAD OF OUR SYSTEM ARRIVING TUESDAY. LOWS
MONDAY NIGHT ARE IN THE 30S.
ON TUESDAY, A WARM FRONT WILL BE LIFTING NORTHWARD THROUGH THE AREA
WHICH IS ATTACHED TO A DEEPENING LOW PRESSURE SYSTEM NEAR THE GREAT
LAKES REGION. THIS WARM FRONT ALONG WITH THE HIGH PRESSURE SYSTEM
MOVING OFFSHORE WILL SET THE STAGE FOR WARMER AIR TO FILTER IN
TUESDAY INTO TUESDAY NIGHT. WE ARE CLOUDY TUESDAY WITH RAIN STARTING
TO MOVE IN DURING THE MORNING TO MIDDAY HOURS. COVERAGE DOES PICK UP
ACROSS THE AREA THROUGH TUESDAY WITH THE BEST COVERAGE TUESDAY
AFTERNOON INTO TUESDAY NIGHT. HIGHS ON TUESDAY ARE IN THE LOW 50S TO
LOW 60S. OUR LOWS TUESDAY NIGHT ARE IN THE MID 40S TO MID 50S.
PERIODS OF RAIN CONTINUE WEDNESDAY INTO WEDNESDAY NIGHT. THE FIRST
COLD FRONT WITH THE DEEPENING LOW NOW MOVING INTO CANADA WILL MOVE
THROUGH WEDNESDAY NIGHT WITH OUR FIRST ROUND OF COLD AIR FILTERING
IN BEHIND IT. HIGHS ON WEDNESDAY ARE IN THE 60S FOR MOST. BY
WEDNESDAY NIGHT, LOWS ARE IN THE 30S FOR MANY. THE RAINFALL TOTALS
ACROSS THE AREA GENERALLY LOOK TO BE A QUARTER OF AN INCH TO HALF AN
INCH. THIS RAIN LOOKS TO BE BENEFICIAL MORE THAN ANYTHING WITH
TUESDAY THROUGH WEDNESDAY NIGHT BEING A DAMP AND DREARY STRETCH.
LONG TERM /THURSDAY THROUGH SUNDAY/
THE SECONDARY COLD FRONT COMES THROUGH ON THURSDAY WHICH WILL USHER
IN MORE COLD AIR LEADING TO STRONG COLD AIR ADVECTION. ALSO, AN
INCOMING AREA OF HIGH PRESSURE FROM THE WEST AND THE DEPARTING
LOW PRESSURE SYSTEM TO THE NORTH IN CANADA WILL SET UP A TIGHT
PRESSURE GRADIENT. THE RESULT WILL BE A WINDY END OF THE WEEK.
THE GENERAL MESSAGING AT THIS TIME FOR THANKSGIVING AND BLACK
FRIDAY IS THAT BOTH DAYS LOOK DRY BUT COLD AND WINDY.
BY FRIDAY NIGHT, OUR HIGH PRESSURE SYSTEM SLIDES IN FROM THE WEST
AND THEN MOVES OVERHEAD INTO SATURDAY WHICH WILL PUT AN END TO THE
WINDY CONDITIONS. STILL LOOKING AT BELOW NORMAL TEMPERATURES FOR
NEXT WEEKEND, THOUGH WITH SOME MODERATION. DRY WEATHER SHOULD
CONTINUE THROUGH AT LEAST SATURDAY WITH THE HIGH IN THE VICINITY OF
THE MID-ATLANTIC.
AVIATION /06Z MONDAY THROUGH FRIDAY/
THE FOLLOWING DISCUSSION IS FOR KPHL, KPNE, KTTN, KABE, KRDG,
KILG, KMIV, KACY AND SURROUNDING AREAS.
THROUGH 12Z...VFR/SKC. WEST WINDS AROUND 5-8 KT. HIGH
CONFIDENCE.
TODAY...VFR. NW WINDS 10 TO 15 KT WITH SPORADIC GUSTS UP TO 20
KT IN THE MORNING, BECOMING W/WSW AROUND 5 TO 8 KT IN THE
AFTERNOON. HIGH CONFIDENCE.
TONIGHT...VFR. WINDS LIGHT AND VARIABLE/CALM. HIGH CONFIDENCE.
OUTLOOK...
TUESDAY...VFR TO START. CONDITIONS DETERIORATING THROUGH THE
DAY WITH MVFR BY THE LATE AFTERNOON/EARLY EVENING WITH RAIN
SHOWERS MOVING IN.
TUESDAY NIGHT THROUGH WEDNESDAY...MVFR/IFR CONDITIONS EXPECTED WITH
PERIODS OF RAIN AND LOW CLOUDS IN PLACE.
WEDNESDAY NIGHT...CONDITIONS LIKELY IMPROVING TO VFR LATE, BUT
MVFR/IFR RESTRICTIONS POSSIBLE (40-60%) FOR AT LEAST PART OF THE
NIGHT.
THURSDAY AND FRIDAY...VFR. WIND GUSTS OUT OF THE WEST/NORTHWEST
AROUND 25-30 KT.
MARINE
SOUTHWEST WINDS 10 TO 15 KT WILL VEER TO THE NORTHWEST AND
INCREASE TO 15 TO 20 KT WITH GUSTS UP TO 25 KT THIS EVENING
BEHIND A COLD FRONT. A SMALL CRAFT ADVISORY IS IN EFFECT FOR THE
OCEAN AND FOR LOWER DELAWARE BAY FOR TONIGHT THROUGH LATE
MONDAY MORNING. WINDS DIMINISH TO 5 TO 10 KT MONDAY AFTERNOON.
SEAS GENERALLY 2 TO 4 FT, THROUGH THERE MAY BE A BRIEF PERIOD OF
3 TO 5 FT SEAS ON THE OCEAN LATE TONIGHT AND INTO MONDAY
MORNING.
OUTLOOK...
MONDAY NIGHT THROUGH TUESDAY...NO MARINE HEADLINES EXPECTED.
TUESDAY NIGHT...SCA CONDITIONS POSSIBLE (40-50%), ESPECIALLY ON THE
OCEAN WATERS WITH WIND GUSTS OUT OF THE SOUTH/SOUTHWEST NEARING 25
KT AND SEAS 3 TO 5 FEET.
WEDNESDAY...SCA CONDITIONS POSSIBLE (40-60%) WITH SEAS NEAR 5 FEET.
WEDNESDAY NIGHT...SCA CONDITIONS EXPECTED WITH WIND GUSTS 25-30 KT
AND SEAS 4-6 FEET.
THURSDAY THROUGH FRIDAY...SCA CONDITIONS EXPECTED WITH POTENTIAL FOR
GALES (50-70%) WITH BRISK WEST/NORTHWEST WINDS 30-35 KT. SEAS 4-
6 FEET.
PHI WATCHES/WARNINGS/ADVISORIES
PA...NONE.
NJ...NONE.
DE...NONE.
MD...NONE.
MARINE...SMALL CRAFT ADVISORY UNTIL 1 PM EST THIS AFTERNOON FOR ANZ431-
450>455.
SYNOPSIS...GUZZO/HOEFLICH
NEAR TERM...AKL/HOEFLICH/MPS
SHORT TERM...GUZZO
LONG TERM...GUZZO
AVIATION...AKL/GUZZO/HOEFLICH/MPS
MARINE...GUZZO/MPS
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