335
FXUS61 KPHI 140248
AFDPHI
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
1048 PM EDT MON JUL 13 2026
WHAT HAS CHANGED
UPDATED DISCUSSION FOR KEY MESSAGES ABOUT THE STORM CHANCES THIS
WEEKEND AND THE TIDAL FLOODING.
KEY MESSAGES
1. ABOVE NORMAL TEMPERATURES TAKE OVER BY TUESDAY, LIKELY
CONTINUING THROUGH THE END OF THE WEEK. WEDNESDAY WILL BE THE
HOTTEST DAY OF THE STRETCH WITH EXTREME HEAT WATCHES AND HEAT
ADVISORIES IN EFFECT FOR MOST OF OUR FORECAST AREA.
2. NEXT WEEKEND COULD BE ACTIVE AND UNSETTLED WITH CHANCES FOR
SHOWERS AND THUNDERSTORMS EACH DAY. SOME STORMS COULD BE SEVERE AND
ALSO MAY PRODUCE HEAVY RAINFALL LEADING TO FLASH FLOODING.
3. SPOTTY MINOR COASTAL FLOODING WILL BE POSSIBLE WITH TONIGHT'S
HIGH TIDE.
DISCUSSION
KEY MESSAGE 1..ABOVE NORMAL TEMPERATURES TAKE OVER BY TUESDAY,
LIKELY CONTINUING THROUGH THE END OF THE WEEK. WEDNESDAY WILL BE THE
HOTTEST DAY OF THE STRETCH WITH EXTREME HEAT WATCHES AND HEAT
ADVISORIES IN EFFECT FOR MOST OF OUR FORECAST AREA.
HEAT STARTS TO BUILD OVER THE AREA TUESDAY AS AN UPPER LEVEL AREA OF
HIGH PRESSURE OVER THE CENTRAL PART OF THE COUNTRY EXPANDS EASTWARD
TOWARDS THE EAST COAST. THIS WILL OCCUR AS A LOW PRESSURE SYSTEM
MOVES THROUGH EASTERN CANADA PUSHING A WARM FRONT THROUGH THE AREA.
HIGHS TUESDAY WILL GENERALLY RANGE FROM THE UPPER 80S TO THE MID 90S
BUT THE DEW POINTS AND HUMIDITY WILL ONLY BE IN THE MODERATE RANGE
SO CONDITIONS ARE EXPECTED TO STAY BELOW HEAT ADVISORY OR WARNING
LEVELS. HOWEVER WEDNESDAY WILL BE A DIFFERENT STORY AS THE HEAT
CONTINUES TO BUILD OVER THE AREA. TEMPERATURES SHOULD GET WELL INTO
THE 90S WITH INCREASING HUMIDITY. ITS NOT OUT OF THE QUESTION PHL
AND A FEW OTHER SITES TAG THE CENTURY MARK AGAIN, BUT NOTHING LIKE
WE SAW TO START JULY. HUMIDITY WILL BE LESS AS WELL. HOWEVER, HEAT
INDEX VALUES ARE STILL PROJECTED TO GET NEAR 105F OR EVEN HIGHER,
POTENTIALLY TO AROUND 110 OVER PORTIONS OF THE MD EASTERN SHORE NEAR
THE CHESAPEAKE BAY.
A DRY COLD FRONT LOOKS TO PASS SOMETIME LATE WEDNESDAY WHICH WILL
KNOCK DOWN TEMPERATURES A BIT, BUT MEDIUM RANGE GUIDANCE AND
ENSEMBLES INDICATE ABOVE NORMAL TEMPERATURES WITH HIGHS RANGING FROM
THE UPPER 80S INTO THE LOW/MID 90S COULD REMAIN THROUGH THE END OF
THE WEEK AND POTENTIALLY INTO THE WEEKEND.
KEY MESSAGE 2...NEXT WEEKEND COULD BE ACTIVE AND UNSETTLED WITH
CHANCES FOR SHOWERS AND THUNDERSTORMS EACH DAY. SOME STORMS
COULD BE SEVERE AND ALSO MAY PRODUCE HEAVY RAINFALL LEADING TO
FLASH FLOODING.
WE ARE STILL SEVERAL DAYS OUT BUT ARE MONITORING THE SEVERE WEATHER
SETUP AS WE GET INTO NEXT WEEKEND. AT THIS POINT THE COLD FRONT THAT
COMES THROUGH THE AREA LATE WEDNESDAY INTO EARLY THURSDAY LOOKS TO
BE MAINLY DRY WITH JUST SOME SPOTTY STORMS POSSIBLE OVER THE
SOUTHERN POCONOS INTO NW NJ LATE WEDNESDAY.
ANOTHER COLD FRONT WILL APPROACH ON FRIDAY. SOME MODELS ARE
TRENDING STORMIER WITH THIS PERIOD. FOR NOW THOUGH, THE
CONSENSUS BLEND OF GUIDANCE IS STILL MOSTLY DRY THROUGH THIS
PERIOD, BUT WILL BE WATCHING TRENDS WITHIN THIS PERIOD CLOSELY.
REGARDLESS, MOST MODELS ARE STILL FOCUSING STORM CHANCES WHEN
THE FRONT FINALLY SINKS INTO THE REGION SATURDAY. THE FRONT WILL
STAY OVER OR AT LEAST NEAR THE REGION INTO SUNDAY. AS IS OFTEN
THE CASE WITH THESE PATTERNS FOLLOWING A BUILDING HEAT PATTERN
MID WEEK, THERE IS SOME POTENTIAL FOR BOTH SEVERE THREATS AND
HEAVY RAIN/FLASH FLOODING THREAT. AT THIS EARLY VANTAGE POINT
THE SHEAR LOOKS TO BE MODERATE TO POTENTIALLY STRONG WITH THE
MAIN QUESTION BEING HOW UNSTABLE IT WILL GET. THIS WILL
DETERMINE THE EXTENT OF ANY SEVERE WEATHER THREAT BUT AT THIS
POINT WE SEE AT LEAST SOME POTENTIAL FOR SEVERE THREATS.
PRECIPITABLE WATER VALUES WILL ALSO BE INCREASING TO AROUND 2+
INCHES. THAT IS WELL ABOUT THE 90TH PERCENTILE FOR THIS TIME OF
YEAR, INCREASING THE RISK FOR HEAVY RAIN/FLASH FLOODING.
THERE'S UNCERTAINTY THOUGH REGARDING HOW FAST THIS FRONT PUSHES
THROUGH AND ALSO WHETHER IT MAY GET HUNG UP NEAR THE AREA INTO
EARLY NEXT WEEK. IF IT MOVES THROUGH FASTER AS THE GFS IS
INDICATING, THINGS COULD START TO CLEAR OUT BY LATER SUNDAY
AFTERNOON WITH FAIR WEATHER TO FOLLOW FOR MONDAY. HOWEVER THE
ECMWF HANGS UP THE FRONT OVER THE AREA INTO NEXT MONDAY WITH
CONTINUING CHANCES FOR SHOWERS AND STORMS.
KEY MESSAGE 3...SPOTTY MINOR COASTAL FLOODING WILL BE POSSIBLE WITH
TONIGHT'S HIGH TIDE.
WHILE ASTRONOMICAL TIDES ARE INCREASING SLIGHTLY WITH THE NEW MOON
TOMORROW, FLOW IS TURNING MORE OFFSHORE. THE HIGH TIDE HAS
MOSTLY PASSED AT MOST LOCATIONS (EXCEPT THE TIDAL PORTIONS OF
THE DELAWARE RIVER), THOUGH SOME SPOTTY TIDAL FLOODING MAY
CONTINUE THROUGH THE NEXT FEW HOURS.
WITH OFFSHORE FLOW CONTINUING AND STRENGTHENING THROUGH THE MIDDLE
OF THE WEEK, NO TIDAL ISSUES ARE EXPECTED AFTER TONIGHT'S HIGH TIDE.
AVIATION /02Z TUESDAY THROUGH SATURDAY/
THE FOLLOWING DISCUSSION IS FOR KPHL, KPNE, KTTN, KABE, KRDG,
KILG, KMIV, KACY AND SURROUNDING AREAS.
TONIGHT...VFR. WINDS GENERALLY SOUTHWEST AT 5-10 KT THIS
EVENING, DECREASING TO 5 KT OR LESS AFTER 03-06Z. HIGH
CONFIDENCE.
TUESDAY...VFR. SOUTHWEST WINDS INCREASING TO AROUND 10 KT AFTER
14- 15Z. SOME GUSTS 15-20 KT POSSIBLE. HIGH CONFIDENCE.
OUTLOOK...
TUESDAY NIGHT THROUGH THURSDAY NIGHT...VFR. NO SIGNIFICANT
WEATHER.
FRIDAY THROUGH SATURDAY...SUB-VFR CONDITIONS WILL BE POSSIBLE
IN ISOLATED TO SCATTERED SHOWERS AND STORMS. THE CHANCE FOR
IMPACTS TO TERMINALS CURRENTLY APPEARS GREATEST SATURDAY
AFTERNOON AND EVENING.
MARINE
SUB-SCA CONDITIONS EXPECTED THROUGH TUESDAY MORNING. WINDS
BECOMING SOUTH TO SOUTHWEST FOR TONIGHT RANGING FROM AROUND 5
KNOTS OFF THE COAST OF DELAWARE TO 10-15 KNOTS OFF THE COAST OF
MONMOUTH COUNTY. SEAS 2-3 FEET.
OUTLOOK...
TUESDAY AFTERNOON THROUGH TUESDAY NIGHT...SCA CONDITIONS
POSSIBLE (40-50%) FOR THE NEW JERSEY COASTAL WATERS AS
SOUTH/SOUTHWESTERLY WIND GUSTS COULD GET NEAR 25 KT AT TIMES AND
SEAS NEAR 5 FEET.
WEDNESDAY THROUGH FRIDAY...NO MARINE HEADLINES EXPECTED.
SATURDAY...WINDS COULD GET NEAR SCA LEVELS BY THE AFTERNOON.
RIP CURRENTS...
FOR TUESDAY, FLOW LARGELY TURNS OFFSHORE WITH A 7 TO 9 SECOND
PERIOD SWELL. WAVE HEIGHTS REMAIN AROUND 2 FEET OR LESS AS
WELL, RESULTING IN A LOW RISK FOR RIP CURRENTS FOR MOST OF THE
JERSEY SHORE AND DELAWARE BEACHES. THE EXCEPTION IS ALONG THE
SOUTHERN NEW JERSEY COAST IN ATLANTIC AND CAPE MAY COUNTIES,
WHERE SOUTH FACING BEACHES LOOK TO HAVE SOME ONSHORE FLOW IN THE
AFTERNOON AS WINDS TURN BACK A BIT MORE SOUTHERLY WITH A SEA
BREEZE. WAVES IN THE SURF ZONE LOOK TO INCREASE UP TO 3 FEET,
AND AS A RESULT THERE IS A MODERATE RISK FOR THE DEVELOPMENT OF
DANGEROUS RIP CURRENTS FOR THIS AREA.
FOR WEDNESDAY, FLOW LOOKS TO REMAIN OFFSHORE ALL DAY ACROSS THE
ENTIRE COAST, WITH A 6 TO 8 SECOND PERIOD SWELL. WAVE HEIGHTS
WILL BE AROUND 2 FEET OR LESS, RESULTING IN A LOW RISK FOR RIP
CURRENTS FOR ALL BEACHES.
FOR SPECIFIC BEACH FORECASTS, VISIT WEATHER.GOV/BEACH/PHI
CLIMATE
A BRIEF 1-DAY SPIKE IN TEMPERATURES IS EXPECTED, WITH HIGHS
LIKELY TO APPROACH RECORDS. HERE ARE THE RECORDS FOR WEDNESDAY,
JULY 15:
ALLENTOWN/ABE 98 IN 1995
AC AIRPORT/ACY 100 IN 1995
AC MARINA/55N 99 IN 1995
GEORGETOWN/GED 96 IN 2024 AND 1993
MOUNT POCONO/MPO 92 IN 1954
PHILADELPHIA/PHL 103 IN 1995
READING/RDG 100 IN 1995
TRENTON/TTN 101 IN 1995
WILMINGTON/ILG 99 IN 1997 AND 1995
PHI WATCHES/WARNINGS/ADVISORIES
PA...EXTREME HEAT WATCH FROM WEDNESDAY MORNING THROUGH WEDNESDAY
EVENING FOR PAZ070-071-104-106.
HEAT ADVISORY FROM 10 AM TO 8 PM EDT WEDNESDAY FOR PAZ054-055-
060>062-101>103-105.
NJ...EXTREME HEAT WATCH FROM WEDNESDAY MORNING THROUGH WEDNESDAY
EVENING FOR NJZ010-012-013-015-017>020-027.
HEAT ADVISORY FROM 10 AM TO 8 PM EDT WEDNESDAY FOR NJZ001-
007>009-014-016-021>026.
DE...EXTREME HEAT WATCH FROM WEDNESDAY MORNING THROUGH WEDNESDAY
EVENING FOR DEZ001.
HEAT ADVISORY FROM 10 AM TO 8 PM EDT WEDNESDAY FOR DEZ002-003.
MD...EXTREME HEAT WATCH FROM WEDNESDAY MORNING THROUGH WEDNESDAY
EVENING FOR MDZ012-015-019.
HEAT ADVISORY FROM 10 AM TO 8 PM EDT WEDNESDAY FOR MDZ020.
MARINE...NONE.
DISCUSSION...FITZSIMMONS/HOEFLICH/JOHNSON
AVIATION...COOPER
MARINE...AKL/FITZSIMMONS/HOEFLICH
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