770
FXUS61 KPHI 271052
AFDPHI
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
652 AM EDT MON APR 27 2026
WHAT HAS CHANGED
THE AVIATION SECTION HAS BEEN UPDATED FOR THE 12Z TAFS.
THE FROST ADVISORY REMAINS IN EFFECT FOR THE EXPANDED AREAS
OUTSIDE OF THE I-95 CORRIDOR IN NEW JERSEY AND SOUTHEASTERN
PENNSYLVANIA.
A SMALL CRAFT ADVISORY IS IN EFFECT FOR ATLANTIC OCEAN COASTAL
WATERS.
KEY MESSAGES
1. AREAS OF FROST AND PATCHY FOG THIS MORNING.
2. ADDITIONAL CHANCES FOR MUCH-NEEDED RAIN ARRIVE DURING THE
MIDDLE OF THIS WEEK.
DISCUSSION
KEY MESSAGE 1...AREAS OF FROST AND PATCHY FOG THIS MORNING.
CANADIAN HIGH PRESSURE WILL BUILD INTO THE REGION THROUGH
TODAY. IT HAS PRODUCED CLEAR SKIES CONTINUE ACROSS THE AREA THIS
MORNING. AS A RESULT, PATCHY FOG HAS DEVELOPED IN SOME RURAL AREAS.
ALSO, TEMPERATURES HAVE DROPPED INTO THE LOW 40S IN MANY AREAS AND
MID/UPPER 30S IN SHELTERED LOCATIONS THESE MOST SHELTERED LOCATIONS
HAVE PROBABLY HAS SOME PATCHY FROST DEVELOP. WE'LL CONTINUE WITH THE
ONGOING FROST ADVISORIES INTO THE MORNING AS PREVIOUSLY ISSUED.
KEY MESSAGE 2...ADDITIONAL CHANCES FOR MUCH-NEEDED RAIN ARRIVE
DURING THE MIDDLE OF THIS WEEK.
A WEAK FRONTAL BOUNDARY APPROACHES THE REGION LATE TUESDAY,
BRINGING A CHANCE FOR LIGHT RAIN. THE CHANCES FOR MEANINGFUL
RAINFALL WITH THIS SYSTEM APPEAR TO BE DECREASING WITH HIGH
PRESSURE STAYING CLOSE BY AND THE FRONTAL BOUNDARY LARGELY
WASHING OUT ACROSS THE REGION. ANOTHER STRONGER LOW IS STILL
EXPECTED TO ARRIVE LATE WEDNESDAY INTO EARLY THURSDAY THAT IS
EXPECTED TO BRING MORE WIDESPREAD SHOWERS AND PERHAPS AN
ISOLATED THUNDERSTORM ACROSS THE REGION. FORECAST RAINFALL
AMOUNTS WEDNESDAY EVENING THROUGH THURSDAY MORNING WILL RANGE
FROM AROUND 0.75 TO 1.00 INCHES.
AVIATION /12Z MONDAY THROUGH FRIDAY/
THE FOLLOWING DISCUSSION IS FOR KPHL, KPNE, KTTN, KABE, KRDG,
KILG, KMIV, KACY AND SURROUNDING AREAS.
TODAY... THERE MAY BE PATCHY LIGHT FOG ACROSS THE
KRDG/KABE/KTTN SITES AND ALSO FOR KMIV/KACY FOR THE PREDAWN
HOURS, WE'VE CONTINUED THE TEMPO GROUPS IN CASE THIS DEVELOPS.
OTHER THAN THAT, VFR CONDITIONS WITH MOSTLY CLEAR SKIES ARE
EXPECTED FOR MONDAY. WINDS WILL BE LIGHT FROM THE N OR NE THIS
MORNING BEFORE VEERING E OR SW BY AFTERNOON. HIGH CONFID, EXCEPT
FOR FOG FORMATION BEFORE DAWN.
TONIGHT... VFR WILL CONTINUE WITH CLEAR SKIES. LIGHT SE WINDS
EXPECTED. HIGH CONFID.
OUTLOOK...
TUESDAY...VFR WITH INCREASING AND LOWERING CLOUDS. A FEW
AFTERNOON OR EVENING SHOWERS POSSIBLE.
WEDNESDAY...SUB-VFR CONDITIONS ALONG WITH SHOWERS, ESPECIALLY IN THE
AFTERNOON AND AT NIGHT.
THURSDAY...SOME SHOWERS POSSIBLE, MAINLY EARLY. MOSTLY VFR.
NORTHWEST WIND GUSTS UP TO 20 KNOTS.
FRIDAY...MAINLY VFR. WEST-NORTHWEST WIND GUSTS 20-25 KNOTS DURING
THE DAY.
MARINE
HIGH PRESSURE WILL BUILD ACROSS THE WATERS TODAY. LIGHT N TO NE
WINDS WILL SWITCH AROUND TO E OR SE LATER TODAY. WINDS SPEEDS WILL
REMAIN MOSTLY AROUND 10 KNOTS MUCH OF THE TIME. SEAS WHICH REMAIN
AROUND 5 TO 6 FT THIS MORNING WILL SLOWLY DIMINISH. WE'LL
CONTINUE WITH THE ONGOING SCA FLAG WITH THE 4AM UPDATE.
OUTLOOK...
TUESDAY THROUGH THURSDAY...SCA CONDITIONS POSSIBLE DUE TO
ELEVATED SEAS AROUND 5 FEET.
FRIDAY...SCA CONDITIONS POSSIBLE FROM WINDS AND SEAS.
PHI WATCHES/WARNINGS/ADVISORIES
PA...FROST ADVISORY UNTIL 8 AM EDT THIS MORNING FOR PAZ054-055-062-
101-103-105.
NJ...FROST ADVISORY UNTIL 8 AM EDT THIS MORNING FOR NJZ001-007-009-
010-015-019-021-022-027.
DE...NONE.
MD...NONE.
MARINE...SMALL CRAFT ADVISORY UNTIL 6 PM EDT THIS EVENING FOR
ANZ450>455.
DISCUSSION...MJL/OHARA
AVIATION...MJL/OHARA
MARINE...MJL/OHARA
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