091
WWUS71 KPHI 181810
NPWPHI
URGENT - WEATHER MESSAGE
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
210 PM EDT MON MAY 18 2026
DEZ001-PAZ102-190900-
/O.EXB.KPHI.HT.Y.0001.000000T0000Z-260521T0000Z/
NEW CASTLE-EASTERN CHESTER-
INCLUDING THE CITIES OF WILMINGTON, KENNETT SQUARE, AND WEST
CHESTER
210 PM EDT MON MAY 18 2026
..HEAT ADVISORY IN EFFECT UNTIL 8 PM EDT WEDNESDAY
* WHAT...HEAT INDEX VALUES UP TO 98.
* WHERE...IN DELAWARE, NEW CASTLE COUNTY. IN PENNSYLVANIA, EASTERN
CHESTER COUNTY.
* WHEN...UNTIL 8 PM EDT WEDNESDAY.
* IMPACTS...HOT TEMPERATURES AND HIGH HUMIDITY MAY CAUSE HEAT
ILLNESSES.
* ADDITIONAL DETAILS...RECORD SETTING HIGH TEMPERATURES ARE QUITE
POSSIBLE THROUGH WEDNESDAY, WITH MAXIMUM HEAT INDICES NEARING 100
DEGREES DURING PEAK HEATING EACH AFTERNOON. GIVEN THE INTENSITY OF
THIS EARLY SEASON STRETCH OF HEAT AND HUMIDITY, WE ARE NOT
ACCLIMATED TO IT YET AND THEREFORE IMPACTS COULD BE GREATER IF
PRECAUTIONS ARE NOT TAKEN. SHOWERS AND SOME THUNDERSTORMS ARRIVE
LATER WEDNESDAY AFTERNOON AND EVENING WHICH WILL BREAK THIS EARLY
SEASON HEAT.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
DRINK PLENTY OF FLUIDS, STAY IN AN AIR-CONDITIONED ROOM, STAY OUT OF
THE SUN, AND CHECK UP ON RELATIVES AND NEIGHBORS.
NJZ012-013-020-027-190900-
/O.EXB.KPHI.HT.Y.0001.000000T0000Z-260521T0000Z/
MIDDLESEX-WESTERN MONMOUTH-OCEAN-SOUTHEASTERN BURLINGTON-
INCLUDING THE CITIES OF FREEHOLD, WHARTON STATE FOREST, JACKSON,
AND NEW BRUNSWICK
210 PM EDT MON MAY 18 2026
..HEAT ADVISORY IN EFFECT UNTIL 8 PM EDT WEDNESDAY
* WHAT...HEAT INDEX VALUES UP TO 98 EXPECTED.
* WHERE...WESTERN MONMOUTH, MIDDLESEX, OCEAN, AND SOUTHEASTERN
BURLINGTON COUNTIES.
* WHEN...UNTIL 8 PM EDT WEDNESDAY.
* IMPACTS...HOT TEMPERATURES AND HIGH HUMIDITY MAY CAUSE HEAT
ILLNESSES.
* ADDITIONAL DETAILS...RECORD SETTING HIGH TEMPERATURES ARE QUITE
POSSIBLE THROUGH WEDNESDAY, WITH MAXIMUM HEAT INDICES NEARING 100
DEGREES DURING PEAK HEATING EACH AFTERNOON. GIVEN THE INTENSITY OF
THIS EARLY SEASON STRETCH OF HEAT AND HUMIDITY, WE ARE NOT
ACCLIMATED TO IT YET AND THEREFORE IMPACTS COULD BE GREATER IF
PRECAUTIONS ARE NOT TAKEN. SHOWERS AND SOME THUNDERSTORMS ARRIVE
LATER WEDNESDAY AFTERNOON AND EVENING WHICH WILL BREAK THIS EARLY
SEASON HEAT.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
DRINK PLENTY OF FLUIDS, STAY IN AN AIR-CONDITIONED ROOM, STAY OUT OF
THE SUN, AND CHECK UP ON RELATIVES AND NEIGHBORS.
NJZ007>010-PAZ060>062-101-103-105-190900-
/O.EXA.KPHI.HT.Y.0001.000000T0000Z-260520T0000Z/
WARREN-MORRIS-HUNTERDON-SOMERSET-BERKS-LEHIGH-NORTHAMPTON-WESTERN
CHESTER-WESTERN MONTGOMERY-UPPER BUCKS-
INCLUDING THE CITIES OF WASHINGTON, OXFORD, MORRISTOWN,
COLLEGEVILLE, BETHLEHEM, FLEMINGTON, CHALFONT, PERKASIE, HONEY
BROOK, EASTON, SOMERVILLE, READING, ALLENTOWN, AND POTTSTOWN
210 PM EDT MON MAY 18 2026
..HEAT ADVISORY IN EFFECT UNTIL 8 PM EDT TUESDAY
* WHAT...HEAT INDEX VALUES UP TO 97 EXPECTED.
* WHERE...IN NEW JERSEY, MORRIS, SOMERSET, WARREN, AND HUNTERDON
COUNTIES. IN PENNSYLVANIA, BERKS, LEHIGH, NORTHAMPTON, UPPER
BUCKS, WESTERN CHESTER, AND WESTERN MONTGOMERY COUNTIES.
* WHEN...UNTIL 8 PM EDT TUESDAY.
* IMPACTS...HOT TEMPERATURES AND HIGH HUMIDITY MAY CAUSE HEAT
ILLNESSES.
* ADDITIONAL DETAILS...RECORD SETTING HIGH TEMPERATURES ARE QUITE
POSSIBLE THROUGH TUESDAY, WITH MAXIMUM HEAT INDICES OF 95 TO NEAR
100 DEGREES DURING PEAK HEATING THROUGH TUESDAY AFTERNOON. GIVEN
THE INTENSITY OF THIS EARLY SEASON STRETCH OF HEAT AND HUMIDITY,
WE ARE NOT ACCLIMATED TO IT YET AND THEREFORE IMPACTS COULD BE
GREATER IF PRECAUTIONS ARE NOT TAKEN. SHOWERS AND SOME
THUNDERSTORMS ARRIVE WEDNESDAY AFTERNOON AND EVENING WHICH WILL
BREAK THIS EARLY SEASON HEAT.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
DRINK PLENTY OF FLUIDS, STAY IN AN AIR-CONDITIONED ROOM, STAY OUT OF
THE SUN, AND CHECK UP ON RELATIVES AND NEIGHBORS.
NJZ015-017>019-PAZ070-071-104-106-190900-
/O.EXT.KPHI.HT.Y.0001.000000T0000Z-260521T0000Z/
MERCER-GLOUCESTER-CAMDEN-NORTHWESTERN BURLINGTON-DELAWARE-
PHILADELPHIA-EASTERN MONTGOMERY-LOWER BUCKS-
INCLUDING THE CITIES OF MORRISVILLE, CAMDEN, CHERRY HILL, MOUNT
HOLLY, TRENTON, LANSDALE, MOORESTOWN, DOYLESTOWN, PHILADELPHIA,
MEDIA, NORRISTOWN, AND GLASSBORO
210 PM EDT MON MAY 18 2026
..HEAT ADVISORY NOW IN EFFECT UNTIL 8 PM EDT WEDNESDAY
* WHAT...HEAT INDEX VALUES UP TO 98.
* WHERE...IN NEW JERSEY, MERCER, CAMDEN, GLOUCESTER, AND
NORTHWESTERN BURLINGTON COUNTIES. IN PENNSYLVANIA, DELAWARE,
EASTERN MONTGOMERY, LOWER BUCKS, AND PHILADELPHIA COUNTIES.
* WHEN...UNTIL 8 PM EDT WEDNESDAY.
* IMPACTS...HOT TEMPERATURES AND HIGH HUMIDITY MAY CAUSE HEAT
ILLNESSES.
* ADDITIONAL DETAILS...RECORD SETTING HIGH TEMPERATURES ARE QUITE
POSSIBLE THROUGH WEDNESDAY, WITH MAXIMUM HEAT INDICES NEARING 100
DEGREES DURING PEAK HEATING EACH AFTERNOON. GIVEN THE INTENSITY OF
THIS EARLY SEASON STRETCH OF HEAT AND HUMIDITY, WE ARE NOT
ACCLIMATED TO IT YET AND THEREFORE IMPACTS COULD BE GREATER IF
PRECAUTIONS ARE NOT TAKEN. SHOWERS AND SOME THUNDERSTORMS ARRIVE
LATER WEDNESDAY AFTERNOON AND EVENING WHICH WILL BREAK THIS EARLY
SEASON HEAT.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
DRINK PLENTY OF FLUIDS, STAY IN AN AIR-CONDITIONED ROOM, STAY OUT OF
THE SUN, AND CHECK UP ON RELATIVES AND NEIGHBORS.
GORSE
CLICK HERE TO GO TO PREVIOUS BULLETINS.
Main Text Page