604
FXUS61 KPHI 120826
AFDPHI
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
426 AM EDT MON OCT 12 2026
WHAT HAS CHANGED
THE AVIATION SECTION WAS UPDATED FOR THE 06Z TAFS.
A COASTAL FLOOD ADVISORY FOR MONDAY MORNING'S HIGH TIDE REMAINS
IN EFFECT FOR MUCH OF THE ATLANTIC COAST OF NEW JERSEY AND
DELAWARE AS WELL AS A PORTION OF THE DELAWARE BAY COAST.
KEY MESSAGES
1. THE REMNANTS OF ISAIAS WILL DEPART THE REGION THIS MORNING.
2. WIDESPREAD MINOR TIDAL FLOODING EXPECTED MONDAY MORNING FOR
MUCH OF THE ATLANTIC OCEAN COASTS IN NEW JERSEY AND DELAWARE.
3. INCREASING TEMPERATURES AND HUMID CONDITIONS THROUGH MIDWEEK
WITH SOME SHOWER CHANCES. THE PATTERN BECOMES MORE ACTIVE
TOWARDS THE END OF THE WEEK AND INTO THE START OF THE WEEKEND.
BY THE WEEKEND, TEMPERATURES GET MUCH COOLER.
DISCUSSION
KEY MESSAGE 1...THE REMNANTS OF ISAIAS WILL DEPART THE REGION
THIS MORNING.
THE REMNANT LOW OF WHAT WAS HURRICANE ISAIAS LIES OVER THE
SOUTHERN DELMARVA PENINSULA AND WILL CONTINUE TO TRACK OFFSHORE
TOWARDS THE NORTHEAST THIS MORNING. SCATTERED SHOWERS THIS
MORNING WILL EVENTUALLY MOVE OUT AS BREEZY NORTHERLY WINDS
FILTER IN BEHIND THE DEPARTING SYSTEM. GUSTS AROUND 15-20 MPH
ARE POSSIBLE IN THE MORNING BEFORE WINDS EASE IN THE AFTERNOON.
LOW CLOUDS THIS MORNING EVENTUALLY SCATTER OUT TO BRING PARTLY
TO MOSTLY SUNNY SKIES IN THE AFTERNOON. AFTERNOON HIGHS IN THE
LOW TO MID 70S.
KEY MESSAGE 2...WIDESPREAD MINOR TIDAL FLOODING EXPECTED MONDAY
MORNING FOR MUCH OF THE ATLANTIC OCEAN COASTS IN NEW JERSEY AND
DELAWARE.
WHILE WE WILL BE MOVING AWAY FROM THE NEW MOON, AND WINDS WILL
BEGIN TO TURN WITH THE PASSAGE OF THE REMNANT LOW, TIDAL LEVELS
WILL REMAIN ELEVATED MONDAY MORNING AS WINDS WILL REMAIN SHORE
PARALLEL IN MANY LOCATIONS. THIS WILL TRAP WATER ALONG THE
COAST, AND PARTICULARLY IN THE BACK BAYS, RESULTING IN A ROUND
OF WIDESPREAD MINOR TIDAL FLOODING ACROSS MOST OF THE ATLANTIC
OCEAN COAST IN NEW JERSEY AND DELAWARE AS WELL AS ALONG THE
DELAWARE BAY SHORE IN KENT COUNTY, DELAWARE.
SPOTTY MINOR TIDAL FLOODING IS ALSO POSSIBLE MONDAY MORNING
ALONG THE REMAINDER OF THE DELAWARE BAY COASTS, THE TIDAL
DELAWARE RIVER, THE RARITAN BAY COAST, AND THE ATLANTIC OCEAN
COAST IN MONMOUTH COUNTY.
NO TIDAL FLOODING CONCERNS EXPECTED ALONG THE CHESAPEAKE BAY.
KEY MESSAGE 3...INCREASING TEMPERATURES AND HUMID CONDITIONS THROUGH
MIDWEEK WITH SOME SHOWER CHANCES. THE PATTERN BECOMES MORE ACTIVE
TOWARDS THE END OF THE WEEK AND INTO THE START OF THE WEEKEND. BY
THE WEEKEND, TEMPERATURES GET MUCH COOLER.
AN EXPANSIVE MID AND UPPER-LEVEL RIDGE WELL TO OUR SOUTH WILL KEEP
THE FLOW MORE ZONAL THROUGH MUCH OF THIS COMING WEEK. THERE WILL BE
MULTIPLE PIECES OF UPPER-LEVEL ENERGY MOVING THROUGH THE REGION
ALONG WITH A COLD FRONT LEADING TO SOME SHOWER CHANCES THIS WEEK. A
COLD FRONT SINKS SOUTH INTO THE AREA TUESDAY NIGHT AND INTO
WEDNESDAY AS A MID-LEVEL SHORTWAVE ALSO MOVES THROUGH THE REGION.
THIS MAY LEAD TO SOME ISOLATED SHOWERS TUESDAY EVENING INTO TUESDAY
NIGHT. HOWEVER, ANY PRECIPITATION CURRENTLY LOOKS LIMITED. THE COLD
FRONT MAY NOT FULLY CLEAR OUR AREA UNTIL LATER IN THE DAY WEDNESDAY.
ADDITIONAL ISOLATED SHOWERS ARE POSSIBLE WEDNESDAY EVENING INTO
WEDNESDAY NIGHT AS MORE UPPER-LEVEL ENERGY MOVES THROUGH THE REGION.
BY THURSDAY, IT IS DRIER AS HIGH PRESSURE BUILDS IN. IN TERMS OF
TEMPERATURES, ON TUESDAY HIGHS REACH THE 70S FOR MANY WITH HUMID
CONDITIONS. ON WEDNESDAY, HIGHS MAINLY REACH THE MID 70S TO MID 80S
WITH HUMID CONDITIONS CONTINUING. BEHIND THE COLD FRONT, HIGHS ON
THURSDAY ARE IN THE 60S FOR MOST WITH LOWER HUMIDITY VALUES.
BY THURSDAY NIGHT, THE UPPER-LEVEL PATTERN BEGINS TO BECOME MORE
AMPLIFIED. AN UPPER-LEVEL TROUGH APPROACHES THE REGION FROM THE WEST
FOR THE END OF THE WEEK AND MOVES INTO THE NORTHEAST THIS WEEKEND.
THERE IS A LARGE AMOUNT OF VARIATION AMONG MODEL GUIDANCE GIVEN THIS
BEING TOWARDS THE END OF THE LONG TERM PERIOD. AS OF RIGHT NOW, AT
THE SURFACE, A DEEPENING LOW PRESSURE SYSTEM IN CANADA WILL CONTINUE
TO MOVE EASTWARD AS IT STRENGTHENS. THIS LOW PRESSURE SYSTEM
CURRENTLY LOOKS TO BRING RAIN TO THE AREA DURING THE TIME PERIOD OF
THURSDAY NIGHT THROUGH FRIDAY NIGHT. A STRONG COLD FRONT LOOKS TO
MOVE THROUGH SOMETIME FRIDAY LEADING TO MUCH COOLER CONDITIONS THIS
WEEKEND. RIGHT NOW, HIGHS ON FRIDAY ARE MAINLY IN THE UPPER 60S
TO MID 70S. OVER THE WEEKEND, FORECAST HIGHS ARE MAINLY IN THE
50S. IT WILL ALSO BE A WINDY PERIOD DUE TO THE DEEPENING LOW TO
THE NORTH AND AN EXPANSIVE HIGH BUILDING IN FROM THE WEST
LEADING TO A TIGHT PRESSURE GRADIENT ACROSS THE REGION.
AVIATION /08Z MONDAY THROUGH FRIDAY/
THE FOLLOWING DISCUSSION IS FOR KPHL, KPNE, KTTN, KABE, KRDG,
KILG, KMIV, KACY AND SURROUNDING AREAS.
REST OF TONIGHT (THROUGH 12Z)...MAINLY IFR WITH LOW STRATUS,
THOUGH SOME SITES MAY LIFT TO MVFR FOR A PERIOD OF TIME. LIFR
MOST LIKELY FOR MIV/ACY. E-NE WINDS BECOMING N AROUND 10 KT
CLOSE TO DAYBREAK. MODERATE CONFIDENCE.
MONDAY...GRADUAL IMPROVEMENT TO VFR BY OR AFTER 16-18Z. N WINDS
10 TO 15 KT WITH GUSTS UP TO 20 KT. WINDS BACK TO THE NW AT 10
KT OR LESS LATE. MODERATE CONFIDENCE.
MONDAY NIGHT...VFR. LIGHT AND VARIABLE WINDS. NO SIGNIFICANT
WEATHER. HIGH CONFIDENCE.
OUTLOOK...
TUESDAY THROUGH THURSDAY...VFR. NO SIGNIFICANT WEATHER.
THURSDAY NIGHT THROUGH FRIDAY...SUB-VFR POSSIBLE WITH RAIN SHOWERS.
GUSTY SOUTHWEST TO WEST WINDS ON FRIDAY.
MARINE
SCA CONDITIONS CONTINUE INTO MONDAY WITH SHOWERS IN THE
MORNING. AREAS OF FOG POSSIBLY, MAINLY EARLY. SEAS REMAIN
ELEVATED AROUND 5-7 FEET DURING THE DAY BEFORE SUBSIDING TO 3-4
FEET OVERNIGHT. WINDS SURGE FROM THE NORTH AROUND 15-20 KTS WITH
GUSTS UP TO 25 KTS IN THE MORNING BEFORE SUBSIDING IN THE
AFTERNOON AND BECOMING NNW AROUND 10 KTS OR LESS AT NIGHT.
OUTLOOK...
TUESDAY THROUGH THURSDAY...NO MARINE HAZARDS EXPECTED.
FRIDAY...SCA CONDITIONS PROBABLE WITH GALES POSSIBLE.
INCREASING SOUTHWEST WINDS OF 25-30 KTS AND SEAS BUILDING TO
5-7 FEET.
PHI WATCHES/WARNINGS/ADVISORIES
PA...NONE.
NJ...COASTAL FLOOD ADVISORY FROM 8 AM THIS MORNING TO 2 PM EDT THIS
AFTERNOON FOR NJZ020-022>027.
DE...COASTAL FLOOD ADVISORY FROM 8 AM THIS MORNING TO 2 PM EDT THIS
AFTERNOON FOR DEZ002>004.
MD...NONE.
MARINE...SMALL CRAFT ADVISORY UNTIL 4 AM EDT TUESDAY FOR ANZ450>452.
SMALL CRAFT ADVISORY UNTIL 2 AM EDT TUESDAY FOR ANZ453>455.
DISCUSSION...MJL/WFO PHI
AVIATION...MJL
MARINE...MJL
CLICK HERE TO GO TO PREVIOUS BULLETINS.
Main Text Page