397
WWUS71 KPHI 200727
NPWPHI
URGENT - WEATHER MESSAGE
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
327 AM EDT WED MAY 20 2026
DEZ001-NJZ015-017>019-PAZ070-071-102-104-106-202030-
/O.CON.KPHI.HT.Y.0001.000000T0000Z-260521T0000Z/
NEW CASTLE-MERCER-GLOUCESTER-CAMDEN-NORTHWESTERN BURLINGTON-
DELAWARE-PHILADELPHIA-EASTERN CHESTER-EASTERN MONTGOMERY-LOWER
BUCKS-
INCLUDING THE CITIES OF KENNETT SQUARE, LANSDALE, PHILADELPHIA,
TRENTON, MORRISVILLE, DOYLESTOWN, GLASSBORO, MOORESTOWN, MOUNT
HOLLY, MEDIA, WEST CHESTER, WILMINGTON, CHERRY HILL, NORRISTOWN,
AND CAMDEN
327 AM EDT WED MAY 20 2026
..HEAT ADVISORY REMAINS IN EFFECT UNTIL 8 PM EDT THIS EVENING
* WHAT...HEAT INDEX VALUES UP TO 97 DEGREES EXPECTED.
* WHERE...IN DELAWARE, NEW CASTLE COUNTY. IN NEW JERSEY, MERCER,
CAMDEN, GLOUCESTER, AND NORTHWESTERN BURLINGTON COUNTIES. IN
PENNSYLVANIA, DELAWARE, EASTERN CHESTER, EASTERN MONTGOMERY, LOWER
BUCKS, AND PHILADELPHIA COUNTIES.
* WHEN...UNTIL 8 PM EDT THIS EVENING.
* IMPACTS...HOT TEMPERATURES AND HIGH HUMIDITY MAY CAUSE HEAT
ILLNESSES.
* ADDITIONAL DETAILS...MAXIMUM HEAT INDICES NEAR 100 DEGREES DURING
PEAK HEATING THIS AFTERNOON. GIVEN THE INTENSITY OF THIS EARLY
SEASON STRETCH OF HEAT AND HUMIDITY, WE ARE NOT FULLY ACCLIMATED
TO IT AND THEREFORE IMPACTS COULD BE GREATER IF PRECAUTIONS ARE
NOT TAKEN. SHOWERS AND SOME THUNDERSTORMS ARRIVE LATER THIS
AFTERNOON AND EVENING WHICH WILL END 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>062-101-103-105-202030-
/O.CON.KPHI.HT.Y.0001.000000T0000Z-260521T0000Z/
WARREN-MORRIS-HUNTERDON-SOMERSET-BERKS-LEHIGH-NORTHAMPTON-WESTERN
CHESTER-WESTERN MONTGOMERY-UPPER BUCKS-
INCLUDING THE CITIES OF MORRISTOWN, COLLEGEVILLE, WASHINGTON,
READING, ALLENTOWN, FLEMINGTON, SOMERVILLE, HONEY BROOK,
BETHLEHEM, PERKASIE, EASTON, POTTSTOWN, CHALFONT, AND OXFORD
327 AM EDT WED MAY 20 2026
..HEAT ADVISORY REMAINS IN EFFECT UNTIL 8 PM EDT THIS EVENING
* WHAT...HEAT INDEX VALUES UP TO 93 DEGREES 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 THIS EVENING.
* IMPACTS...HOT TEMPERATURES AND HIGH HUMIDITY MAY CAUSE HEAT
ILLNESSES.
* ADDITIONAL DETAILS...MAXIMUM HEAT INDICES NEAR 95 DEGREES DURING
PEAK HEATING THIS AFTERNOON. GIVEN THE INTENSITY OF THIS EARLY
SEASON STRETCH OF HEAT AND HUMIDITY, WE ARE NOT FULLY ACCLIMATED
TO IT AND THEREFORE IMPACTS COULD BE GREATER IF PRECAUTIONS ARE
NOT TAKEN. SHOWERS AND SOME THUNDERSTORMS ARRIVE THIS AFTERNOON
AND EVENING WHICH WILL END 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.
NJZ012-013-020-027-202030-
/O.CON.KPHI.HT.Y.0001.000000T0000Z-260521T0000Z/
MIDDLESEX-WESTERN MONMOUTH-OCEAN-SOUTHEASTERN BURLINGTON-
INCLUDING THE CITIES OF JACKSON, FREEHOLD, NEW BRUNSWICK, AND
WHARTON STATE FOREST
327 AM EDT WED MAY 20 2026
..HEAT ADVISORY REMAINS IN EFFECT UNTIL 8 PM EDT THIS EVENING
* WHAT...HEAT INDEX VALUES UP TO 98 DEGREES EXPECTED.
* WHERE...WESTERN MONMOUTH, MIDDLESEX, OCEAN, AND SOUTHEASTERN
BURLINGTON COUNTIES.
* WHEN...UNTIL 8 PM EDT THIS EVENING.
* IMPACTS...HOT TEMPERATURES AND HIGH HUMIDITY MAY CAUSE HEAT
ILLNESSES.
* ADDITIONAL DETAILS...MAXIMUM HEAT INDICES NEAR 100 DEGREES DURING
PEAK HEATING THIS AFTERNOON. GIVEN THE INTENSITY OF THIS EARLY
SEASON STRETCH OF HEAT AND HUMIDITY, WE ARE NOT FULLY ACCLIMATED
TO IT AND THEREFORE IMPACTS COULD BE GREATER IF PRECAUTIONS ARE
NOT TAKEN. SHOWERS AND SOME THUNDERSTORMS ARRIVE LATER THIS
AFTERNOON AND EVENING WHICH WILL END 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.
AKL
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