884  
FXUS61 KPHI 211615  
AFDPHI  
 
AREA FORECAST DISCUSSION  
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ  
1215 PM EDT THU AUG 21 2025  
   
SYNOPSIS  
 
HURRICANE ERIN WILL MAKE ITS CLOSEST PASS TO THE MID ATLANTIC  
TODAY, BRINGING SIGNIFICANT COASTAL AND MARINE HAZARDS TO THE  
REGION. ERIN WILL PUSH FARTHER OUT TO SEA TONIGHT INTO FRIDAY AS  
WEAK HIGH PRESSURE WILL BUILDS INTO THE AREA, WITH FAIR WEATHER  
EXPECTED THROUGH SATURDAY. A COLD FRONT WILL APPROACH THE  
REGION ON SUNDAY, THEN MOVE OFFSHORE BY MONDAY, BRINGING MORE  
UNSETTLED CONDITIONS. COOLER AND DRIER HIGH PRESSURE WILL THEN  
BUILD INTO THE REGION INTO THE MIDDLE OF NEXT WEEK.  
 
 
   
NEAR TERM /THROUGH TONIGHT/  
 
HURRICANE ERIN WILL BRING SIGNIFICANT COASTAL HAZARDS TO THE  
NEW JERSEY AND DELAWARE COASTLINES THROUGH TONIGHT. WHILE THE  
CLOSEST POINT OF APPROACH OF ERIN WILL BE ~300-400 MILES  
SOUTHEAST OF OUR AREA, THE WIND FIELD OF ERIN WILL CONTINUE TO  
GROW IN SIZE WITH TROPICAL STORM FORCE WINDS REACHING JUST OFF  
OUR COASTS. THE MAIN IMPACTS FROM ERIN WILL BE STRONG GUSTY  
WINDS, LIFE THREATENING RIP CURRENTS, STRONG POWERFUL SEAS  
YIELDING BEACH EROSION, AND COASTAL FLOODING. REFER TO THE  
MARINE AND COASTAL FLOODING SECTIONS BELOW FOR FURTHER DETAILS.  
 
OUTSIDE OF COASTAL AREAS, OVERCAST SKIES, BREEZY NORTHEAST  
WINDS, BUT DRY CONDITIONS ARE EXPECTED TODAY ASIDE FOR SOME MIST  
THIS MORNING. SUSTAINED WINDS AROUND 10-15 MPH ARE ANTICIPATED  
WHERE WINDS MAY OCCASIONALLY GUST UPWARDS OF 25-35 MPH. WITH THE  
CLOUDY AND BREEZY CONDITIONS, HIGH TEMPS WILL REMAIN BELOW  
NORMAL WITH HIGHS ONLY IN THE UPPER 60S TO LOW 70S.  
 
FOR COASTAL AREAS, A MUCH DIFFERENT DAY IS ANTICIPATED AS  
NORTHEAST WINDS WILL BE MUCH STRONGER WITH SUSTAINED WINDS OF  
25-35 MPH WHERE GUSTS UPWARDS OF 50 MPH ARE POSSIBLE ALONG THE  
IMMEDIATE COAST. NO CHANGES HAVE BEEN MADE TO THE WIND ADVISORY,  
WHICH BEGINS AT 10 AM THIS MORNING UNTIL MIDNIGHT TONIGHT FROM  
OCEAN COUNTY SOUTHWARD. MONMOUTH COUNTY SHOULD FALL SHORT OF  
ADVISORY CRITERIA DUE TO SHORTER FETCH OFF THE ATLANTIC. A FEW  
SHOWERS FROM THE OUTER BANDS OF ERIN COMBINED WITH ONSHORE FLOW  
MAY REACH OUR COASTLINE, BUT NOTHING OF SIGNIFICANCE IN TERMS OF  
PRECIPITATION IS EXPECTED WHILE UNDER OVERCAST SKIES. THE MORE  
CONCERNING THREAT TO COASTAL LOCALES WILL BE THE AFOREMENTIONED  
THREAT OF POWERFUL SEAS CAUSING BEACH EROSION, RIP CURRENTS, AND  
TIDAL/COASTAL FLOODING, WHERE FURTHER DETAILS CAN BE FOUND IN  
THEIR RESPECTIVE SECTIONS BELOW.  
 
CONDITIONS WILL BEGIN TO IMPROVE FOR ALL AREAS TONIGHT AS ERIN  
BEGINS TO ACCELERATE NORTHEAST AWAY FROM THE AREA. SKIES WILL  
BEGIN TO SCATTER OUT AFTER SUNSET FROM WEST TO EAST, GIVING WAY  
TO CLEAR SKIES AFTER MIDNIGHT. GUSTY WINDS MAY LINGER INTO THE  
EARLY EVENING, BUT OVERALL WILL DIMINISH AS THE NIGHT  
PROGRESSES. LOW TEMPS WILL FALL INTO THE LOW 50S TO LOW 60S.  
 
FOR THE LATEST UPDATES ON HURRICANE ERIN, PLEASE PROCEED TO THE  
NATIONAL HURRICANE CENTER'S WEBSITE: WWW.NHC.NOAA.GOV.  
 
 
   
SHORT TERM /FRIDAY THROUGH SATURDAY NIGHT/  
 
AS HURRICANE ERIN PUSHES WELL AWAY FROM OUR ARE INTO FRIDAY,  
WEAK RIDGING WILL BUILD ACROSS THE REGION. THIS WILL GIVE US A  
NICE BREAK FROM THE ACTIVE AND LOUSY WEATHER CONDITIONS WE'VE  
EXPERIENCED MUCH OF THIS WEEK. TEMPERATURES WILL RETURN TOWARD  
NORMAL VALUES, WITH FORECAST HIGH TEMPERATURES IN THE MID 80S  
AND LOWS IN THE MID 50S TO MID 60S FOR MOST AREAS.  
 
FRIDAY WILL SEE PLEASANTLY DRY AIR THANKS TO DEWPOINTS MIXING  
OUT INTO THE 50S AND EVEN SOME UPPER 40S UNDER A LIGHT NORTHERLY  
BREEZE. FRIDAY NIGHT INTO SATURDAY MORNING WILL FEATURE BELOW  
NORMAL TEMPERATURES IN THE MID 50S TO LOW 60S IN MANY AREAS. AS  
SURFACE HIGH PRESSURE SHIFTS OFFSHORE INTO SATURDAY, SURFACE  
FLOW WILL TURN SOUTHERLY, WHICH WILL BEGIN TO INCREASE  
TEMPERATURES AND DEWPOINTS A FEW DEGREES COMPARED TO FRIDAY, BUT  
STILL A VERY PLEASANT LATE AUGUST DAY. THE DRY AIR AND RIDGING  
WILL RESULT IN MOSTLY SUNNY/CLEAR SKIES THROUGH SATURDAY AS  
WELL.  
 
 
   
LONG TERM /SUNDAY THROUGH WEDNESDAY/  
 
ANOTHER PATTERN CHANGE ON THE HORIZON BEGINNING SUNDAY THROUGH  
MONDAY AS RATHER AMPLIFIED UPPER TROUGHING DEVELOPS ACROSS THE  
GREAT LAKES AND MIDWEST REGION. THIS TROUGHING PATTERN WILL BE  
UNUSUALLY STRONG FOR LATE AUGUST STANDARDS. MORE HUMID AND  
SHOWERY/STORM CONDITIONS CAN BE EXPECTED SUNDAY THROUGH MONDAY  
BEFORE A COLD FRONT ARRIVES SOMETIME MONDAY, USHERING IN A  
COOLER AND MUCH DRIER AIRMASS IN ITS WAKE INTO THE MIDDLE OF  
NEXT WEEK.  
 
THE SYNOPTIC PATTERN WILL BE FAVORABLE FOR WIDESPREAD  
CONVECTION SUNDAY THROUGH SUNDAY NIGHT, WITH SOME ACTIVITY  
LIKELY LINGERING INTO MONDAY AS WELL. THE EXACT DETAILS OF THIS  
CONVECTION REMAIN UNCLEAR AT THE MOMENT, BUT THIS IS NOT A  
PARTICULARLY FAVORABLE SETUP FOR SEVERE STORMS OR FLASH  
FLOODING. WE'LL CONTINUE TO MONITOR ANY POTENTIAL THREATS FROM  
THESE SHOWERS AND STORMS IN THE COMING DAYS THOUGH. TEMPERATURES  
WILL REMAIN NEAR TO SLIGHTLY BELOW NORMAL WITH HIGHS IN THE  
UPPER 70S TO MID 80S SUNDAY AND MONDAY AND LOWS IN THE 60S  
SUNDAY NIGHT. FOLLOWING FRONTAL PASSAGE ON MONDAY, COOLER AND  
MUCH DRIER AIR WILL FOLLOW INTO THE MIDDLE OF THE WEEK WITH VERY  
PLEASANT WEATHER CONDITIONS EXPECTED. HIGHS WILL BE MAINLY IN  
THE 70S, LOWS MAINLY IN THE 50S, AND DEWPOINTS IN THE 40S AND  
50S. NOT BAD FOR LATE AUGUST, WITH CONDITIONS MORE TYPICAL OF  
MID TO LATE SEPTEMBER.  
 
 
   
AVIATION /16Z THURSDAY THROUGH MONDAY/  
 
THE FOLLOWING DISCUSSION IS FOR KPHL, KPNE, KTTN, KABE, KRDG,  
KILG, KMIV, KACY AND SURROUNDING AREAS.  
 
THIS AFTERNOON...HIGH END IFR CIGS REMAINING ACROSS THE  
DELAWARE VALLEY SITES AS OF EARLY AFTERNOON WITH MVFR CIGS BACK  
TO KRDG,KABE. CONDITIONS AT ALL SITES SLOWLY IMPROVE INTO THE  
EVENING AS DRIER AIR GETS IMPORTED FROM THE N/NW. GUSTY N WINDS  
15 TO 10 KTS WITH G20-25KT BUT G30-35 KT (KACY, KMIV). MODERATE  
CONFIDENCE.  
 
TONIGHT...LINGERING MVFR CEILINGS EARLY(KACY,KMIV), IMPROVING  
TO VFR AND AT ALL TERMINALS AFTER 03Z. NORTH WINDS AROUND 7-12  
KT WITH A FEW GUSTS EARLY IN THE EVENING AROUND 20 KT. MODERATE-  
HIGH CONFIDENCE.  
 
OUTLOOK...  
 
FRIDAY THROUGH SATURDAY NIGHT...VFR. NO SIGNIFICANT WEATHER.  
 
SUNDAY THROUGH MONDAY...VFR CONDITIONS SHOULD GENERALLY PREVAIL,  
HOWEVER SCATTERED SHOWERS AND THUNDERSTORMS ARE FORECAST THROUGH  
THIS PERIOD.  
 
 
   
MARINE  
 
TROPICAL STORM WARNINGS ARE IN EFFECT FOR THE WATERS OFFSHORE  
MANASQUAN INLET TO FENWICK ISLAND THROUGH TONIGHT WITH A GALE  
WARNING IN EFFECT FOR THE WATERS OFFSHORE SANDY HOOK TO  
MANASQUAN INLET THROUGH TONIGHT. FOR THE LOWER DELAWARE BAY, A  
GALE WARNING IS IN EFFECT THROUGH MIDNIGHT TONIGHT. FOR THE  
UPPER DELAWARE BAY, A SMALL CRAFT ADVISORY IS IN EFFECT THROUGH  
TONIGHT.  
 
NORTHEAST WINDS CONTINUE TO STEADILY INCREASE TODAY AS  
HURRICANE ERIN APPROACHES WITH SUSTAINED WINDS BETWEEN 25-35 KT  
EXPECTED. WIND GUSTS UPWARDS OF 40-45 KT ARE EXPECTED ON THE  
ATLANTIC COASTAL WATERS WITH GUSTS UPWARDS OF 30-40 KT EXPECTED  
ON THE DELAWARE BAY BEFORE GRADUALLY DIMINISHING OVERNIGHT.  
OCCASIONAL SHOWERS POSSIBLE ACROSS ALL WATERS WHICH MAY CAUSE  
LOCALLY HIGHER GUSTS.  
 
SEAS OF 8-12 FEET THIS MORNING WILL STEADILY BUILD UP TO 12-17  
FEET THIS AFTERNOON BEFORE GRADUALLY BEGINNING TO ABATE TONIGHT  
FOR THE ATLANTIC COASTAL WATERS. ROUGH AND CHOPPY WATERS ARE  
EXPECTED ON THE DELAWARE BAY.  
 
OUTLOOK...  
 
FRIDAY THROUGH SATURDAY NIGHT...SMALL CRAFT ADVISORY CONDITIONS  
EXPECTED, MAINLY DUE TO ELEVATED SEAS FROM DEPARTING HURRICANE  
ERIN.  
 
SUNDAY THROUGH MONDAY...CONDITIONS SHOULD REMAIN BELOW ADVISORY  
CRITERIA, HOWEVER SCATTERED SHOWERS AND THUNDERSTORMS ARE  
FORECAST.  
 
RIP CURRENTS...  
 
STAY OUT OF THE WATER!  
 
FOR TODAY, NORTHEAST WINDS 25-35 MPH WITH GUSTS UP TO 50 MPH.  
DANGEROUS SURF ZONE CONDITIONS CONTINUE AS BREAKING WAVES PEAK  
AT 7-12 FEET ALONG WITH LONG PERIOD SOUTHEASTERLY SWELLS (15-18  
SECONDS) STILL ASSOCIATED WITH HURRICANE ERIN. A HIGH RISK FOR  
THE DEVELOPMENT OF LIFE-THREATENING RIP CURRENTS CONTINUES FOR  
THE JERSEY SHORE AND THE DELAWARE BEACHES.  
 
FOR FRIDAY, CONDITIONS BEGIN TO IMPROVE BUT STILL EXPECTING  
HIGH WAVES OF 5 TO 9 FEET AND A LONG PERIOD 13 TO 16 SECOND  
SWELL WITH HURRICANE ERIN PULLING AWAY. A HIGH RISK FOR  
DEVELOPMENT OF LIFE-THREATENING RIP CURRENTS WILL REMAIN THROUGH  
THE END OF THE WEEK.  
 
A HIGH RISK OF RIP CURRENTS IS LIKELY TO PERSIST THROUGH  
SATURDAY, AND POSSIBLY SUNDAY AS WELL.  
 
A HIGH SURF ADVISORY AND HIGH RISK FOR RIP CURRENTS STATEMENT  
ARE IN EFFECT THROUGH FRIDAY FOR THE NEW JERSEY AND DELAWARE  
ATLANTIC COASTS. WAVES IN THE SURF ZONE WILL REACH AND EXCEED 8  
FEET, AND A HIGH RISK OF RIP CURRENTS WILL PERSIST THROUGH THE  
END OF THE WEEK.  
 
FOR SPECIFIC BEACH FORECASTS, VISIT WEATHER.GOV/BEACH/PHI  
 
 
   
TIDES/COASTAL FLOODING  
 
PROLONGED AND STRENGTHENING NORTHEAST WINDS WILL RESULT IN  
PERIODS OF COASTAL FLOODING THROUGH THE END OF THIS WEEK. WATER  
WILL SLOWLY PILE UP AS ONSHORE FLOW CONTINUES THROUGH THIS  
EVENING. SWELLS FROM HURRICANE ERIN WILL ALSO ENHANCE THE  
THREAT FOR TIDAL FLOODING AND PUSH OF WATER ONSHORE, ESPECIALLY  
THIS EVENING WHEN THE MOST SIGNIFICANT AND WIDESPREAD COASTAL  
FLOODING IMPACTS ARE EXPECTED. WIDESPREAD MINOR COASTAL FLOODING  
IS FORECAST TO OCCUR WITH THIS MORNING'S HIGH TIDE FROM AROUND  
BARNEGAT BAY SOUTH THROUGH COASTAL DELAWARE.  
 
A WIDESPREAD IMPACTFUL COASTAL FLOOD EVENT IS EXPECTED AS ERIN  
PASSES BY OFFSHORE TODAY INTO FRIDAY. THE COASTAL FLOOD WARNINGS  
REMAIN IN EFFECT FOR ALL COUNTIES ALONG THE ATLANTIC OCEAN AND  
WITHIN DELAWARE BAY, WHERE WIDESPREAD MODERATE FLOODING IS  
EXPECTED ALONG THE COAST. THERE IS POTENTIAL FOR LOCALLY MAJOR  
COASTAL FLOODING IMPACTS, ESPECIALLY IN SUSSEX COUNTY, DE AND  
CAPE MAY COUNTY, NJ, WHERE WE ARE NOW FORECASTING WATER LEVELS  
TO REACH MAJOR FLOOD STAGE AT LEWES AND CAPE MAY. THE GREATEST  
INUNDATION AND IMPACTS CAN BE EXPECTED WITH THIS EVENING'S HIGH  
TIDE. WIDESPREAD MINOR FLOODING IS FORECAST WITH THE FRIDAY  
MORNING HIGH TIDE, THEN ADDITIONAL MODERATE COASTAL FLOODING IS  
POSSIBLE WITH THE FRIDAY EVENING HIGH TIDE.  
 
ALONG THE TIDAL DELAWARE RIVER, WIDESPREAD MINOR FLOODING IS  
EXPECTED, BEGINNING WITH TONIGHT'S HIGH TIDE AND CONTINUING  
THROUGH THE HIGH TIDE LATE FRIDAY NIGHT/EARLY SATURDAY MORNING.  
A COASTAL FLOOD ADVISORY REMAINS IN EFFECT FOR COMMUNITIES  
ALONG THE TIDAL DELAWARE RIVER, BEGINNING TONIGHT AND  
CONTINUING THROUGH SATURDAY MORNING.  
 
CURRENTLY, NO WIDESPREAD COASTAL FLOODING IS FORECAST FOR OUR  
CHESAPEAKE BAY SHORELINE UNTIL SATURDAY MORNING'S HIGH TIDE,  
THOUGH CONFIDENCE IS LOW ON EXACTLY HOW WIDESPREAD THE TIDAL  
FLOODING WILL BE.  
 
 
   
CLIMATE  
 
NEAR RECORD BREAKING COLDEST HIGH TEMPERATURES ARE FORECAST FOR  
TODAY. RECORDS FOR OUR CLIMATE SITES ARE LISTED BELOW:  
 
RECORD COLDEST HIGH TEMPERATURES  
AUGUST 21  
SITE RECORD/YEAR  
ALLENTOWN (ABE) 61/2007  
AC AIRPORT (ACY) 66/1956  
AC MARINA (55N) 67/1956  
GEORGETOWN (GED) 69/1990  
MOUNT POCONO (MPO) 54/2007  
PHILADELPHIA (PHL) 64/2007  
READING (RDG) 60/1990  
TRENTON (TTN) 63/2007  
WILMINGTON (ILG) 65/2007  
 
 
   
PHI WATCHES/WARNINGS/ADVISORIES  
 
PA...COASTAL FLOOD ADVISORY FROM 11 PM THIS EVENING TO 5 AM EDT  
SATURDAY FOR PAZ070-071-106.  
NJ...COASTAL FLOOD ADVISORY FROM 9 PM THIS EVENING TO 2 AM EDT  
SATURDAY FOR NJZ016.  
COASTAL FLOOD WARNING UNTIL 2 AM EDT SATURDAY FOR NJZ020-  
022>027.  
HIGH RISK FOR RIP CURRENTS THROUGH FRIDAY EVENING FOR NJZ014-  
024>026.  
HIGH SURF ADVISORY UNTIL 8 PM EDT FRIDAY FOR NJZ014-024>026.  
WIND ADVISORY UNTIL MIDNIGHT EDT TONIGHT FOR NJZ024>026.  
COASTAL FLOOD WARNING FROM 5 PM THIS AFTERNOON TO 2 AM EDT  
SATURDAY FOR NJZ012>014-021.  
COASTAL FLOOD ADVISORY FROM 11 PM THIS EVENING TO 5 AM EDT  
SATURDAY FOR NJZ017>019.  
DE...COASTAL FLOOD ADVISORY FROM 9 PM THIS EVENING TO 2 AM EDT  
SATURDAY FOR DEZ001.  
COASTAL FLOOD WARNING UNTIL 2 AM EDT SATURDAY FOR DEZ002>004.  
HIGH RISK FOR RIP CURRENTS THROUGH FRIDAY EVENING FOR DEZ004.  
HIGH SURF ADVISORY UNTIL 8 PM EDT FRIDAY FOR DEZ004.  
WIND ADVISORY UNTIL MIDNIGHT EDT TONIGHT FOR DEZ004.  
MD...NONE.  
MARINE...SMALL CRAFT ADVISORY UNTIL 6 AM EDT FRIDAY FOR ANZ430.  
GALE WARNING UNTIL MIDNIGHT EDT TONIGHT FOR ANZ431.  
GALE WARNING UNTIL 6 AM EDT FRIDAY FOR ANZ450.  
TROPICAL STORM WARNING FOR ANZ451>455.  
 
 
 
 
SYNOPSIS...STAARMANN  
NEAR TERM...DESILVA  
SHORT TERM...STAARMANN  
LONG TERM...STAARMANN  
AVIATION...DESILVA/STAARMANN/PO  
MARINE...DESILVA/HOEFLICH/STAARMANN  
TIDES/COASTAL FLOODING...  
CLIMATE...  
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