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