Heat Advisory 1, NWS Philadelphia/Mount Holly

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

289 
WWUS71 KPHI 190726
NPWPHI

URGENT - WEATHER MESSAGE
National Weather Service Mount Holly NJ
326 AM EDT Tue May 19 2026

DEZ001-NJZ015-017>019-PAZ070-071-102-104-106-192030-
/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 Mount Holly, Cherry Hill, Camden, Media,
West Chester, Morrisville, Doylestown, Moorestown, Lansdale,
Glassboro, Norristown, Philadelphia, Trenton, Kennett Square, and
Wilmington
326 AM EDT Tue May 19 2026

...HEAT ADVISORY REMAINS IN EFFECT UNTIL 8 PM EDT WEDNESDAY...

* WHAT...Heat index values up to 98 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 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>062-101-103-105-192030-
/O.CON.KPHI.HT.Y.0001.000000T0000Z-260520T0000Z/
Warren-Morris-Hunterdon-Somerset-Berks-Lehigh-Northampton-Western
Chester-Western Montgomery-Upper Bucks-
Including the cities of Oxford, Morristown, Reading, Bethlehem,
Chalfont, Somerville, Washington, Collegeville, Honey Brook,
Perkasie, Flemington, Pottstown, Allentown, and Easton
326 AM EDT Tue May 19 2026

...HEAT ADVISORY REMAINS IN EFFECT UNTIL 8 PM EDT THIS EVENING...

* WHAT...Heat index values up to 97 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...Record setting high temperatures are quite 
  possible through today, with maximum heat indices of 95 to near 
  100 degrees during peak heating this 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.

&&

$$

NJZ012-013-020-027-192030-
/O.CON.KPHI.HT.Y.0001.000000T0000Z-260521T0000Z/
Middlesex-Western Monmouth-Ocean-Southeastern Burlington-
Including the cities of New Brunswick, Jackson, Freehold, and
Wharton State Forest
326 AM EDT Tue May 19 2026

...HEAT ADVISORY REMAINS IN EFFECT UNTIL 8 PM EDT WEDNESDAY...

* WHAT...Heat index values up to 98 degrees 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.

&&

$$

AKL

043 
WWUS71 KPHI 191825
NPWPHI

URGENT - WEATHER MESSAGE
National Weather Service Mount Holly NJ
225 PM EDT Tue May 19 2026

NJZ007>010-PAZ060>062-101-103-105-200900-
/O.EXT.KPHI.HT.Y.0001.000000T0000Z-260521T0000Z/
Warren-Morris-Hunterdon-Somerset-Berks-Lehigh-Northampton-Western
Chester-Western Montgomery-Upper Bucks-
Including the cities of Oxford, Allentown, Chalfont, Morristown,
Collegeville, Pottstown, Flemington, Easton, Washington,
Somerville, Honey Brook, Perkasie, Reading, and Bethlehem
225 PM EDT Tue May 19 2026

...HEAT ADVISORY NOW IN EFFECT UNTIL 8 PM EDT WEDNESDAY...

* WHAT...Heat index values up to 97 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 Wednesday.

* IMPACTS...Hot temperatures and high humidity may cause heat 
  illnesses.

* ADDITIONAL DETAILS...Maximum heat indices near 100 degrees during 
  peak heating this afternoon and then around 95 degrees Wednesday. 
  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 Wednesday 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.

&&

$$

DEZ001-NJZ015-017>019-PAZ070-071-102-104-106-200900-
/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 Wilmington, Trenton, Philadelphia,
Lansdale, Cherry Hill, Media, Mount Holly, Norristown,
Morrisville, Camden, Kennett Square, West Chester, Moorestown,
Doylestown, and Glassboro
225 PM EDT Tue May 19 2026

...HEAT ADVISORY REMAINS IN EFFECT UNTIL 8 PM EDT WEDNESDAY...

* WHAT...Heat index values up to 99 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 Wednesday.

* IMPACTS...Hot temperatures and high humidity may cause heat 
  illnesses.

* ADDITIONAL DETAILS...Maximum heat indices near 100 degrees during 
  peak heating this afternoon and then again on Wednesday. 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 Wednesday 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.

&&

$$

NJZ012-013-020-027-200900-
/O.CON.KPHI.HT.Y.0001.000000T0000Z-260521T0000Z/
Middlesex-Western Monmouth-Ocean-Southeastern Burlington-
Including the cities of Wharton State Forest, New Brunswick,
Freehold, and Jackson
225 PM EDT Tue May 19 2026

...HEAT ADVISORY REMAINS IN EFFECT UNTIL 8 PM EDT WEDNESDAY...

* WHAT...Heat index values up to 99 degrees 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...Maximum heat indices near 100 degrees during 
  peak heating this afternoon and then again on Wednesday. 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 Wednesday 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.

&&

$$

Gorse

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

448 
WWUS71 KPHI 201435
NPWPHI

URGENT - WEATHER MESSAGE
National Weather Service Mount Holly NJ
Issued by National Weather Service Wakefield VA
1035 AM EDT Wed May 20 2026

DEZ001-NJZ015-017>019-PAZ070-071-102-104-106-202245-
/O.CON.KPHI.HT.Y.0001.000000T0000Z-260521T0000Z/
New Castle-Mercer-Gloucester-Camden-Northwestern Burlington-
Delaware-Philadelphia-Eastern Chester-Eastern Montgomery-Lower
Bucks-
1035 AM EDT Wed May 20 2026

...HEAT ADVISORY REMAINS IN EFFECT UNTIL 8 PM EDT THIS EVENING...

* WHAT...Heat index values up to 97.

* 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.

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>062-101-103-105-202245-
/O.CON.KPHI.HT.Y.0001.000000T0000Z-260521T0000Z/
Warren-Morris-Hunterdon-Somerset-Berks-Lehigh-Northampton-Western
Chester-Western Montgomery-Upper Bucks-
1035 AM EDT Wed May 20 2026

...HEAT ADVISORY REMAINS IN EFFECT UNTIL 8 PM EDT THIS EVENING...

* WHAT...Heat index values up to 93.

* 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.

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.

&&

$$

NJZ012-013-020-027-202245-
/O.CON.KPHI.HT.Y.0001.000000T0000Z-260521T0000Z/
Middlesex-Western Monmouth-Ocean-Southeastern Burlington-
1035 AM EDT Wed May 20 2026

...HEAT ADVISORY REMAINS IN EFFECT UNTIL 8 PM EDT THIS EVENING...

* WHAT...Heat index values up to 98.

* 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.

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.

&&

$$

MRD

794 
WWUS71 KPHI 201753
NPWPHI

URGENT - WEATHER MESSAGE
National Weather Service Mount Holly NJ
153 PM EDT Wed May 20 2026

DEZ001-NJZ015-017>019-PAZ070-071-102-104-106-210000-
/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 Trenton, Cherry Hill, Camden, Glassboro,
Mount Holly, West Chester, Moorestown, Media, Kennett Square,
Norristown, Morrisville, Lansdale, Wilmington, Philadelphia, and
Doylestown
153 PM 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...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...Showers and thunderstorms arrive late this 
  afternoon and this 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>062-101-103-105-210000-
/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 Reading, Perkasie, Morristown,
Washington, Chalfont, Flemington, Easton, Bethlehem, Oxford,
Pottstown, Allentown, Somerville, Honey Brook, and Collegeville
153 PM EDT Wed May 20 2026

...HEAT ADVISORY REMAINS IN EFFECT UNTIL 8 PM EDT THIS EVENING...

* WHAT...Heat index values up to 96 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...Showers and thunderstorms arrive into this 
  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.

&&

$$

NJZ012-013-020-027-210000-
/O.CON.KPHI.HT.Y.0001.000000T0000Z-260521T0000Z/
Middlesex-Western Monmouth-Ocean-Southeastern Burlington-
Including the cities of Freehold, Jackson, New Brunswick, and
Wharton State Forest
153 PM 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...Showers and thunderstorms arrive this 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.

&&

$$

Gorse

279 
WWUS71 KPHI 202235
NPWPHI

URGENT - WEATHER MESSAGE
National Weather Service Mount Holly NJ
635 PM EDT Wed May 20 2026

DEZ001-NJZ007>010-012-013-015-017>020-027-PAZ060>062-070-071-101>106-
202345-
/O.CAN.KPHI.HT.Y.0001.000000T0000Z-260521T0000Z/
New Castle-Warren-Morris-Hunterdon-Somerset-Middlesex-Western
Monmouth-Mercer-Gloucester-Camden-Northwestern Burlington-Ocean-
Southeastern Burlington-Berks-Lehigh-Northampton-Delaware-
Philadelphia-Western Chester-Eastern Chester-Western Montgomery-
Eastern Montgomery-Upper Bucks-Lower Bucks-
Including the cities of Freehold, Wharton State Forest, Lansdale,
Cherry Hill, Flemington, Norristown, Morrisville, Kennett Square,
Collegeville, West Chester, Easton, Oxford, Perkasie, Media,
Glassboro, Pottstown, Philadelphia, Camden, Jackson, Washington,
Honey Brook, Moorestown, Wilmington, Trenton, Morristown,
Doylestown, Mount Holly, Chalfont, Allentown, New Brunswick,
Reading, Somerville, and Bethlehem
635 PM EDT Wed May 20 2026

...HEAT ADVISORY IS CANCELLED...

A cold front will cross the area and excessive heat is no longer 
expected.

$$

PO

Area Forecast Discussion
National Weather Service Mount Holly NJ
132 AM EDT Mon May 18 2026

.WHAT HAS CHANGED...
Added a Climate Section, which includes record high and warmest
low temperatures for the area through Wednesday.

Updated aviation discussion for 06Z TAFs.

&&

.KEY MESSAGES...
1. A significant warming trend will continue into this week.
High temperatures will generally be upward of 10 to 20 degrees
above normal, with low to mid 90s expected for many areas Monday
through Wednesday.

2. A cold front will bring some showers and thunderstorms to
the region Wednesday through Thursday, along with moderating
temperatures closer to normal by the end of next week.

&&

.DISCUSSION...
KEY MESSAGE 1...A significant warming trend will continue into
this week. High temperatures will generally be upward of 10 to
20 degrees above normal, with low to mid 90s expected for many
areas Monday through Wednesday.

An upper level ridge will continue to build into the eastern US
this week, bringing a period of well above normal and summer-
like temperatures. At the surface, high pressure over the
western Atlantic will anchor and strengthen off the coast of the
Mid Atlantic. This will result in a very warm south to
southwesterly flow for several days bringing the warming trend.

The southerly flow continues tonight and it will be relatively
mild as a result with lows in the 60s. Coastal areas as well as
our N/W zones should get down into the low 60s while the urban
corridor will struggle to get below the middle to upper 60s.

Temperatures continue to climb into Monday for inland areas
with highs generally in the 89 to 94 degree range for eastern
PA, inland southern NJ, and Delmarva. However the flow be more
out of the south to even southeast, so they'll be more of
cooling influence near the coast and even extending a bit
farther inland compared to today. This will keep these areas
near the coast mainly in the 70s to low 80s.

Confidence continues to increase that temperatures on Tuesday
will get into the low-mid 90s across most of the region, outside
of the immediate coastal areas and higher elevations. This is
increasing the chance that areas within the I-95 urban corridor
will flirt with heat advisory criteria. Diurnal mixing will
likely keep higher dew points at bay during the peak of the heat
in the afternoon. Overall, this is still not a high confidence
setup. However, with warmer air temperatures, it will not take
as much moisture to push heat indicies a few degrees higher and
exceed the early season criteria in the urban areas.

The heat forecast remains a bit more uncertain for Wednesday,
as a faster progression of an approaching front may bring more
clouds ahead of the showers and storms, and cap temps and heat
indices a bit lower. Regardless, this will still be a period of
abnormally warm conditions and getting the area close to record
high temperature territory Monday through Wednesday this week.

The heat looks to break by Thursday following the cold frontal
passage late Wednesday. Temperatures will moderate closer to
normal for the remainder of the week and into next weekend.

KEY MESSAGE 2...A cold front will bring some showers and
thunderstorms to the region Wednesday through Thursday, along
with moderating temperatures closer to normal by the end of next
week.

As mentioned above, a cold front will approach the area
Wednesday and bring an end to the stretch of above normal
temperatures by Thursday. Showers and thunderstorms will
accompany this front as it passes through the region. Recent
guidance trends show the front moving through during the second
half of Wednesday into Wednesday night. At this range there is
still uncertainties in timing, but if the front moves through
during the day Wednesday, then the potential for stronger storms
increases as there will be plenty of instability present.
Currently, the better forcing looks to be displaced to the north
of the front. All of this said, it remains still a bit early to
get very specific on the details and extent of the convection,
impacts, and hazards. The front then looks to linger nearby or
just south of the area on Thursday leading to more potential for
showers. By the end of the week and into next weekend, the
trend continues to show a more unsettled pattern.

&&

.AVIATION /06Z MONDAY THROUGH FRIDAY/...
The following discussion is for KPHL, KPNE, KTTN, KABE, KRDG,
KILG, KMIV, KACY and surrounding areas.

Through 12Z...VFR. Winds mostly calm, if not SSW less than 5
kts. High confidence.

Monday...VFR. S to SW winds near 5 kts in the morning,
increasing to around 10 kts by 18Z. Winds a little more east of
south for ILG, MIV, and ACY, and perhaps as high as 15 kts at
times, but not anticipating any prevailing gusts. High
confidence.

Monday night...VFR. SSW winds 5-10 kts. High confidence.

Outlook...

Tuesday...VFR prevailing with no significant weather expected.

Wednesday through Thursday...Sub-VFR with rain showers and
thunderstorms Wednesday afternoon and evening. Rain showers may
continue into Thursday.

Friday...Sub-VFR possible with the chance for rain showers.

&&

.MARINE...
Southerly winds increase to around 10 to 15 gusting up to 20
knots by Monday afternoon but the conditions are expected to
stay below Small Craft Advisory levels. Seas around 3-4 feet.

Outlook...

Tuesday through Wednesday...Southwest winds increase through
the day Tuesday with Small Craft Advisory conditions possible by
Tuesday afternoon as wind gusts reach near 25 kt. Seas look to
start to reach near 5 feet as well Tuesday evening. Seas lessen
by Wednesday morning but elevated winds out of the southwest
remain through the day Wednesday with gusts near 25 kt. Showers
and potentially some isolated thunderstorms move through
Wednesday afternoon into early Wednesday night.

Thursday...Conditions expected to be below Small Craft Advisory
criteria by this time but showers may linger.

Friday...Conditions are expected to be below Small Craft
Advisory criteria. There is the chance for some rain showers.

Rip Currents...

Monday, south-southeast winds will be 10 to 15 mph with
breaking waves of 1 to 2 feet. There will be a southeasterly
swell with a period of around 8 seconds. As a result, there is a
MODERATE risk for the development of dangerous and life
threatening rip currents at the Jersey Shore and a LOW risk at
Delaware Beaches where winds will be more shore parallel.

Tuesday, south-southwesterly winds of 10-20 mph with breaking
waves of 2 to 3 feet. A southeasterly swell will remain, though
the period may be slightly shorter. For now, have opted for a
MODERATE risk for the development of dangerous and life
threatening rip currents for all NJ and DE beaches.

Important to note that while surface temperatures inland will
be in the upper 80s to low 90s on Monday, and low to mid 90s
Tuesday, temperatures along the coasts will mainly be in the 70s
to near 80 due to ocean temperatures in the 50s. These cold
water temperatures can quickly cause hypothermia and physical
incapacitation to anyone suddenly immersed in the water.

For specific beach forecasts, visit weather.gov/beach/phi

&&

.CLIMATE...
Near record breaking temperatures are forecast from today through
Wednesday. Records for our climate sites are listed below:

Record High Temperatures
                           May 18
Site                  Record/Year
Allentown (ABE)           96/1962
AC Airport (ACY)          93/1987
AC Marina (55N)           90/1987
Georgetown (GED)          91/1974
Mount Pocono (MPO)        87/1962
Philadelphia (PHL)        94/1962
Reading (RDG)             96/1962
Trenton (TTN)             96/1986
Wilmington (ILG)          94/1962

Record Warmest Low Temperatures
                           May 18
Site                  Record/Year
Allentown (ABE)           65/2017
AC Airport (ACY)          70/2017
AC Marina (55N)           66/2017
Georgetown (GED)          72/2017
Mount Pocono (MPO)        61/2017
Philadelphia (PHL)        72/2017
Reading (RDG)             67/1900, 1943, & 2017
Trenton (TTN)             71/2017
Wilmington (ILG)          72/2017

Record High Temperatures
                           May 19
Site                  Record/Year
Allentown (ABE)           97/1962
AC Airport (ACY)          96/1962
AC Marina (55N)           92/1998
Georgetown (GED)          96/1962
Mount Pocono (MPO)        89/1962
Philadelphia (PHL)        96/1962
Reading (RDG)             96/1962
Trenton (TTN)             96/1962
Wilmington (ILG)          95/1962

Record Warmest Low Temperatures
                           May 19
Site                  Record/Year
Allentown (ABE)           65/2017
AC Airport (ACY)          73/2017
AC Marina (55N)           68/1998
Georgetown (GED)          73/2017
Mount Pocono (MPO)        60/1943
Philadelphia (PHL)        74/1877
Reading (RDG)             68/1962
Trenton (TTN)             70/2017
Wilmington (ILG)          70/2017

Record High Temperatures
                           May 20
Site                  Record/Year
Allentown (ABE)           92/1962 & 1996
AC Airport (ACY)          96/1996
AC Marina (55N)           93/1996
Georgetown (GED)          95/1962
Mount Pocono (MPO)        89/1996
Philadelphia (PHL)        94/1962 & 1996
Reading (RDG)             97/1996
Trenton (TTN)             94/1996
Wilmington (ILG)          96/1996

Record Warmest Low Temperatures
                           May 20
Site                  Record/Year
Allentown (ABE)           66/2019
AC Airport (ACY)          68/1996
AC Marina (55N)           69/1996
Georgetown (GED)          74/2019
Mount Pocono (MPO)        61/1959
Philadelphia (PHL)        71/2019
Reading (RDG)             69/1959 & 1996
Trenton (TTN)             68/1903, 1959, & 1962
Wilmington (ILG)          70/2019

&&

.PHI WATCHES/WARNINGS/ADVISORIES...
PA...None.
NJ...None.
DE...None.
MD...None.
MARINE...None.

&&

DISCUSSION...AKL/Fitzsimmons/Staarmann
AVIATION...AKL/Fitzsimmons/MPS/Staarmann
MARINE...AKL/Cooper/Fitzsimmons/Staarmann

Hazardous Weather Outlook
National Weather Service Mount Holly NJ
505 AM EDT Sun May 17 2026

MDZ012-015-019-020-180915-
Kent MD-Queen Annes-Talbot-Caroline-
505 AM EDT Sun May 17 2026

This Hazardous Weather Outlook is for northeast Maryland.

.DAY ONE...Today and tonight.

No hazardous weather is expected at this time.

.DAYS TWO THROUGH SEVEN...Monday through Saturday.

The probability for widespread hazardous weather is low.

.SPOTTER INFORMATION STATEMENT...

Spotter activation is not expected at this time.

Staarmann