Alert archive / New Jersey / Heat Advisories in 2026

Heat Advisory 4, NWS Philadelphia/Mount Holly

July 4, 20264 states

NWS Philadelphia/Mount Holly issued this heat advisory at Jul 4, 2026, 10:52 PM EDT for 4 states. It took effect at Jul 5, 2026, 8:00 AM EDT. It was in force for 12 hr.

The area

The counties it named.

The facts

Issued
Jul 4, 2026, 10:52 PM EDT (02:52 UTC)
In effect from
Jul 5, 2026, 8:00 AM EDT
Expired
Jul 5, 2026, 8:00 PM EDT
In force
12 hr
Issued by
NWS Philadelphia/Mount Holly
All 30 counties

Kent County, DE, New Castle County, DE, Sussex County, DE, Caroline County, MD, Kent County, MD, Queen Anne's County, MD, Talbot County, MD, Atlantic County, NJ, Burlington County, NJ, Camden County, NJ, Cape May County, NJ, Cumberland County, NJ, Gloucester County, NJ, Hunterdon County, NJ, Mercer County, NJ, Middlesex County, NJ, Monmouth County, NJ, Morris County, NJ, Ocean County, NJ, Salem County, NJ, Somerset County, NJ, Warren County, NJ, Berks County, PA, Bucks County, PA, Chester County, PA, Delaware County, PA, Lehigh County, PA, Montgomery County, PA, Northampton County, PA, Philadelphia County, PA

The radar

The Philadelphia radar (KDIX), 67 km from the middle of the area, began a volume at 02:53 UTC, the scan nearest the moment this went out.

Open the radar archive at this moment

The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.

The nearest sounding before it

Brookhaven, NY (KOKX), launched 00:00Z, 2.9 hours before the alert went out and 226 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.

Skew-T log-pSkew-T log-p diagram, Brookhaven, NY at 00:00Z on 2026-07-05Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1105 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Brookhaven, NY at 00:00Z on 2026-07-05The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 100 square meters per square second.193958Sfc1 km3 km6 km9 kmRMLM
The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.
Mixed-layer CAPE
1105 J/kg
Mixed-layer CIN
-28 J/kg
Mixed-layer LCL
1723 m above ground
0-6 km bulk shear
29 kt
0-1 km storm-relative helicity
100 m²/s²
0-3 km storm-relative helicity
144 m²/s²
Significant tornado parameter
0.1
Supercell composite
3.7

Open this sounding in Storm Lab

The text

As transmitted.

990 
WWUS71 KPHI 050252
NPWPHI

URGENT - WEATHER MESSAGE
National Weather Service Mount Holly NJ
1052 PM EDT Sat Jul 4 2026

DEZ001>004-MDZ012-015-019-020-051600-
/O.NEW.KPHI.HT.Y.0004.260705T1200Z-260706T0000Z/
New Castle-Kent-Inland Sussex-Delaware Beaches-Kent MD-Queen
Annes-Talbot-Caroline-
Including the cities of Chestertown, Easton, Denton, Georgetown,
Dover, Rehoboth Beach, Centreville, and Wilmington
1052 PM EDT Sat Jul 4 2026

...HEAT ADVISORY IN EFFECT FROM 8 AM TO 8 PM EDT SUNDAY...

* WHAT...Heat index values of 100 to 105 expected.

* WHERE...In Delaware, Kent, New Castle, Delaware Beaches, and 
  Inland Sussex Counties. In Maryland, Caroline, Kent MD, Queen 
  Annes, and Talbot Counties.

* WHEN...From 8 AM to 8 PM EDT Sunday.

* 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.

Take extra precautions when outside. Wear lightweight and loose 
fitting clothing. Try to limit strenuous activities to early morning 
or evening. Take action when you see symptoms of heat exhaustion and 
heat stroke.

To reduce risk during outdoor work, the Occupational Safety and 
Health Administration recommends scheduling frequent rest breaks in 
shaded or air conditioned environments. Anyone overcome by heat 
should be moved to a cool and shaded location. Heat stroke is an 
emergency! Call 9 1 1.

&&

$$

NJZ007>010-012-015-PAZ060>062-070-071-101>106-051600-
/O.NEW.KPHI.HT.Y.0004.260705T1200Z-260706T0000Z/
Warren-Morris-Hunterdon-Somerset-Middlesex-Mercer-Berks-Lehigh-
Northampton-Delaware-Philadelphia-Western Chester-Eastern Chester-
Western Montgomery-Eastern Montgomery-Upper Bucks-Lower Bucks-
Including the cities of Allentown, Chalfont, Pottstown,
Norristown, Trenton, Perkasie, Media, Honey Brook, Doylestown,
Morrisville, Bethlehem, Flemington, Kennett Square, New
Brunswick, Easton, Philadelphia, Washington, Lansdale,
Morristown, West Chester, Somerville, Collegeville, Reading, and
Oxford
1052 PM EDT Sat Jul 4 2026

...HEAT ADVISORY IN EFFECT FROM 8 AM TO 8 PM EDT SUNDAY...

* WHAT...Heat index values of 95 to 100 expected.

* WHERE...Northern and Northwest New Jersey and much of Eastern 
  Pennsylvania.

* WHEN...From 8 AM to 8 PM EDT Sunday.

* 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.

Take extra precautions when outside. Wear lightweight and loose 
fitting clothing. Try to limit strenuous activities to early morning 
or evening. Take action when you see symptoms of heat exhaustion and 
heat stroke.

To reduce risk during outdoor work, the Occupational Safety and 
Health Administration recommends scheduling frequent rest breaks in 
shaded or air conditioned environments. Anyone overcome by heat 
should be moved to a cool and shaded location. Heat stroke is an 
emergency! Call 9 1 1.

&&

$$

NJZ013-014-016>027-051600-
/O.NEW.KPHI.HT.Y.0004.260705T1200Z-260706T0000Z/
Western Monmouth-Eastern Monmouth-Salem-Gloucester-Camden-
Northwestern Burlington-Ocean-Cumberland-Atlantic-Cape May-
Atlantic Coastal Cape May-Coastal Atlantic-Coastal Ocean-
Southeastern Burlington-
Including the cities of Sandy Hook, Ocean City, Cherry Hill, Long
Beach Island, Mount Holly, Millville, Pennsville, Atlantic City,
Glassboro, Moorestown, Freehold, Hammonton, Wharton State Forest,
Jackson, Cape May Court House, and Camden
1052 PM EDT Sat Jul 4 2026

...HEAT ADVISORY IN EFFECT FROM 8 AM TO 8 PM EDT SUNDAY...

* WHAT...Heat index values around 100 expected.

* WHERE...Central and southern New Jersey.

* WHEN...From 8 AM to 8 PM EDT Sunday.

* 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.

Take extra precautions when outside. Wear lightweight and loose 
fitting clothing. Try to limit strenuous activities to early morning 
or evening. Take action when you see symptoms of heat exhaustion and 
heat stroke.

To reduce risk during outdoor work, the Occupational Safety and 
Health Administration recommends scheduling frequent rest breaks in 
shaded or air conditioned environments. Anyone overcome by heat 
should be moved to a cool and shaded location. Heat stroke is an 
emergency! Call 9 1 1.

&&

$$

PO
3 follow-up statements
520 
WWUS71 KPHI 050645
NPWPHI

URGENT - WEATHER MESSAGE
National Weather Service Mount Holly NJ
245 AM EDT Sun Jul 5 2026

DEZ001>004-MDZ012-015-019-020-052000-
/O.CON.KPHI.HT.Y.0004.260705T1200Z-260706T0000Z/
New Castle-Kent-Inland Sussex-Delaware Beaches-Kent MD-Queen
Annes-Talbot-Caroline-
Including the cities of Easton, Dover, Rehoboth Beach,
Centreville, Denton, Chestertown, Wilmington, and Georgetown
245 AM EDT Sun Jul 5 2026

...HEAT ADVISORY REMAINS IN EFFECT FROM 8 AM THIS MORNING TO 8 PM 
EDT THIS EVENING...

* WHAT...Heat index values of 100 to 105 expected.

* WHERE...In Delaware, Kent, New Castle, Delaware Beaches, and 
  Inland Sussex Counties. In Maryland, Caroline, Kent MD, Queen 
  Annes, and Talbot Counties.

* WHEN...From 8 AM this morning to 8 PM EDT this evening.

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

* ADDITIONAL DETAILS...Temperatures and heat indices will not be 
  quite as high today as they have been the past couple days. 
  However impacts are still expected especially given the long 
  duration of high temperatures and humidity.

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.

Take extra precautions when outside. Wear lightweight and loose 
fitting clothing. Try to limit strenuous activities to early morning 
or evening. Take action when you see symptoms of heat exhaustion and 
heat stroke.

To reduce risk during outdoor work, the Occupational Safety and 
Health Administration recommends scheduling frequent rest breaks in 
shaded or air conditioned environments. Anyone overcome by heat 
should be moved to a cool and shaded location. Heat stroke is an 
emergency! Call 9 1 1.

&&

$$

NJZ007>010-012-015-PAZ060>062-070-071-101>106-052000-
/O.CON.KPHI.HT.Y.0004.260705T1200Z-260706T0000Z/
Warren-Morris-Hunterdon-Somerset-Middlesex-Mercer-Berks-Lehigh-
Northampton-Delaware-Philadelphia-Western Chester-Eastern Chester-
Western Montgomery-Eastern Montgomery-Upper Bucks-Lower Bucks-
Including the cities of Oxford, Philadelphia, Bethlehem, West
Chester, Lansdale, Perkasie, Honey Brook, Collegeville, Trenton,
Flemington, Allentown, Doylestown, Pottstown, Chalfont, Easton,
New Brunswick, Norristown, Somerville, Reading, Washington,
Morristown, Media, Kennett Square, and Morrisville
245 AM EDT Sun Jul 5 2026

...HEAT ADVISORY REMAINS IN EFFECT FROM 8 AM THIS MORNING TO 8 PM 
EDT THIS EVENING...

* WHAT...Heat index values of 95 to 100 expected.

* WHERE...Portions of central, northern, and northwest New Jersey 
  and east central and southeast Pennsylvania.

* WHEN...From 8 AM this morning to 8 PM EDT this evening.

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

* ADDITIONAL DETAILS...Temperatures and heat indices will not be 
  quite as high today as they have been the past couple days. 
  However impacts are still expected especially given the long 
  duration of high temperatures and humidity.

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.

Take extra precautions when outside. Wear lightweight and loose 
fitting clothing. Try to limit strenuous activities to early morning 
or evening. Take action when you see symptoms of heat exhaustion and 
heat stroke.

To reduce risk during outdoor work, the Occupational Safety and 
Health Administration recommends scheduling frequent rest breaks in 
shaded or air conditioned environments. Anyone overcome by heat 
should be moved to a cool and shaded location. Heat stroke is an 
emergency! Call 9 1 1.

&&

$$

NJZ013-014-016>027-052000-
/O.CON.KPHI.HT.Y.0004.260705T1200Z-260706T0000Z/
Western Monmouth-Eastern Monmouth-Salem-Gloucester-Camden-
Northwestern Burlington-Ocean-Cumberland-Atlantic-Cape May-
Atlantic Coastal Cape May-Coastal Atlantic-Coastal Ocean-
Southeastern Burlington-
Including the cities of Jackson, Camden, Freehold, Hammonton,
Cape May Court House, Atlantic City, Millville, Mount Holly,
Cherry Hill, Long Beach Island, Wharton State Forest, Ocean City,
Moorestown, Sandy Hook, Glassboro, and Pennsville
245 AM EDT Sun Jul 5 2026

...HEAT ADVISORY REMAINS IN EFFECT FROM 8 AM THIS MORNING TO 8 PM 
EDT THIS EVENING...

* WHAT...Heat index values up to 100 expected.

* WHERE...Portions of central and southern New Jersey.

* WHEN...From 8 AM this morning to 8 PM EDT this evening.

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

* ADDITIONAL DETAILS...Temperatures and heat indices will not be 
  quite as high today as the past couple days. However impacts are 
  still expected especially given the long duration of high 
  temperatures and humidity.

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.

Take extra precautions when outside. Wear lightweight and loose 
fitting clothing. Try to limit strenuous activities to early morning 
or evening. Take action when you see symptoms of heat exhaustion and 
heat stroke.

To reduce risk during outdoor work, the Occupational Safety and 
Health Administration recommends scheduling frequent rest breaks in 
shaded or air conditioned environments. Anyone overcome by heat 
should be moved to a cool and shaded location. Heat stroke is an 
emergency! Call 9 1 1.

&&

$$

Fitzsimmons
167 
WWUS71 KPHI 051608
NPWPHI

URGENT - WEATHER MESSAGE
National Weather Service Mount Holly NJ
1208 PM EDT Sun Jul 5 2026

DEZ001>004-MDZ012-015-019-020-060000-
/O.CON.KPHI.HT.Y.0004.000000T0000Z-260706T0000Z/
New Castle-Kent-Inland Sussex-Delaware Beaches-Kent MD-Queen
Annes-Talbot-Caroline-
Including the cities of Easton, Rehoboth Beach, Centreville,
Wilmington, Chestertown, Denton, Georgetown, and Dover
1208 PM EDT Sun Jul 5 2026

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

* WHAT...Heat index values of 100 to 105 expected.

* WHERE...In Delaware, Kent, New Castle, Delaware Beaches, and 
  Inland Sussex Counties. In Maryland, Caroline, Kent MD, Queen 
  Annes, and Talbot Counties.

* WHEN...Until 8 PM EDT this evening.

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

* ADDITIONAL DETAILS...Temperatures and heat indices will not be 
  quite as high today as they have been the past couple days. 
  However impacts are still expected especially given the long 
  duration of high temperatures and humidity.

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.

Take extra precautions when outside. Wear lightweight and loose 
fitting clothing. Try to limit strenuous activities to early morning 
or evening. Take action when you see symptoms of heat exhaustion and 
heat stroke.

To reduce risk during outdoor work, the Occupational Safety and 
Health Administration recommends scheduling frequent rest breaks in 
shaded or air conditioned environments. Anyone overcome by heat 
should be moved to a cool and shaded location. Heat stroke is an 
emergency! Call 9 1 1.

&&

$$

NJZ007>010-012-015-PAZ060>062-070-071-101>106-060000-
/O.CON.KPHI.HT.Y.0004.000000T0000Z-260706T0000Z/
Warren-Morris-Hunterdon-Somerset-Middlesex-Mercer-Berks-Lehigh-
Northampton-Delaware-Philadelphia-Western Chester-Eastern Chester-
Western Montgomery-Eastern Montgomery-Upper Bucks-Lower Bucks-
Including the cities of Allentown, Media, Pottstown, Somerville,
Lansdale, Philadelphia, Morrisville, Bethlehem, West Chester,
Morristown, Perkasie, Norristown, Trenton, Doylestown,
Washington, Flemington, Honey Brook, Chalfont, New Brunswick,
Easton, Reading, Kennett Square, Collegeville, and Oxford
1208 PM EDT Sun Jul 5 2026

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

* WHAT...Heat index values of 95 to 100 expected.

* WHERE...Portions of central, northern, and northwest New Jersey 
  and east central and southeast Pennsylvania.

* WHEN...Until 8 PM EDT this evening.

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

* ADDITIONAL DETAILS...Temperatures and heat indices will not be 
  quite as high today as they have been the past couple days. 
  However impacts are still expected especially given the long 
  duration of high temperatures and humidity.

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.

Take extra precautions when outside. Wear lightweight and loose 
fitting clothing. Try to limit strenuous activities to early morning 
or evening. Take action when you see symptoms of heat exhaustion and 
heat stroke.

To reduce risk during outdoor work, the Occupational Safety and 
Health Administration recommends scheduling frequent rest breaks in 
shaded or air conditioned environments. Anyone overcome by heat 
should be moved to a cool and shaded location. Heat stroke is an 
emergency! Call 9 1 1.

&&

$$

NJZ013-014-016>027-060000-
/O.CON.KPHI.HT.Y.0004.000000T0000Z-260706T0000Z/
Western Monmouth-Eastern Monmouth-Salem-Gloucester-Camden-
Northwestern Burlington-Ocean-Cumberland-Atlantic-Cape May-
Atlantic Coastal Cape May-Coastal Atlantic-Coastal Ocean-
Southeastern Burlington-
Including the cities of Atlantic City, Cape May Court House,
Freehold, Long Beach Island, Wharton State Forest, Millville,
Moorestown, Jackson, Camden, Hammonton, Sandy Hook, Mount Holly,
Cherry Hill, Glassboro, Pennsville, and Ocean City
1208 PM EDT Sun Jul 5 2026

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

* WHAT...Heat index values up to 100 expected.

* WHERE...Portions of central and southern New Jersey.

* WHEN...Until 8 PM EDT this evening.

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

* ADDITIONAL DETAILS...Temperatures and heat indices will not be 
  quite as high today as the past couple days. However impacts are 
  still expected especially given the long duration of high 
  temperatures and humidity.

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.

Take extra precautions when outside. Wear lightweight and loose 
fitting clothing. Try to limit strenuous activities to early morning 
or evening. Take action when you see symptoms of heat exhaustion and 
heat stroke.

To reduce risk during outdoor work, the Occupational Safety and 
Health Administration recommends scheduling frequent rest breaks in 
shaded or air conditioned environments. Anyone overcome by heat 
should be moved to a cool and shaded location. Heat stroke is an 
emergency! Call 9 1 1.

&&

$$

Cooper
314 
WWUS71 KPHI 052338
NPWPHI

URGENT - WEATHER MESSAGE
National Weather Service Mount Holly NJ
738 PM EDT Sun Jul 5 2026

DEZ001>004-MDZ012-015-019-020-NJZ007>010-012>027-PAZ060>062-070-071-
101>106-060045-
/O.EXP.KPHI.HT.Y.0004.000000T0000Z-260706T0000Z/
New Castle-Kent-Inland Sussex-Delaware Beaches-Kent MD-Queen
Annes-Talbot-Caroline-Warren-Morris-Hunterdon-Somerset-Middlesex-
Western Monmouth-Eastern Monmouth-Mercer-Salem-Gloucester-Camden-
Northwestern Burlington-Ocean-Cumberland-Atlantic-Cape May-
Atlantic Coastal Cape May-Coastal Atlantic-Coastal Ocean-
Southeastern Burlington-Berks-Lehigh-Northampton-Delaware-
Philadelphia-Western Chester-Eastern Chester-Western Montgomery-
Eastern Montgomery-Upper Bucks-Lower Bucks-
Including the cities of Chestertown, Long Beach Island, Kennett
Square, Centreville, Doylestown, Morristown, Somerville,
Perkasie, Trenton, Reading, Honey Brook, Wharton State Forest,
Jackson, Moorestown, Oxford, Sandy Hook, Morrisville, Allentown,
Millville, Bethlehem, Denton, Pennsville, Cherry Hill, Cape May
Court House, Philadelphia, West Chester, Collegeville, Atlantic
City, Washington, Easton, Glassboro, Camden, Pottstown,
Hammonton, Freehold, New Brunswick, Chalfont, Georgetown,
Flemington, Rehoboth Beach, Media, Norristown, Mount Holly,
Lansdale, Wilmington, Dover, and Ocean City
738 PM EDT Sun Jul 5 2026

...HEAT ADVISORY WILL EXPIRE AT 8 PM EDT THIS EVENING...

Thunderstorms and rains will put an end to the recent stretch of hot 
weather.

$$

PO

What forecasters said that day

The local office's own words before this heat advisory went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Philadelphia/Mount Holly wrote its last area forecast discussion before this heat advisory went out at Jul 4, 8:07 PM EDT, 2 hours 45 minutes earlier. Its key messages:

  • 1. Dangerous heat and humidity will continue across the region through today. The heat will start to break Sunday and especially Monday. 2. Showers and thunderstorms are expected to impact the area late this afternoon into this evening and have the potential to produce severe weather and localized flash flooding. Additional rounds of showers and thunderstorms are expected Sunday and Monday with a continuing threat for both severe weather and flash flooding.
Area forecast discussion, Jul 4, 8:07 PM EDT, 2 hours 45 minutes before
Area Forecast Discussion
National Weather Service Mount Holly NJ
807 PM EDT Sat Jul 4 2026

.WHAT HAS CHANGED...
Excessive Heat headlines have expired.

Updated Aviation section for 00Z TAFs.

Severe Thunderstorm Watch #459 is in effect for the entire
County Warning area until 11PM.

&&

.KEY MESSAGES...
1. Dangerous heat and humidity will continue across the region
through today. The heat will start to break Sunday and especially
Monday.

2. Showers and thunderstorms are expected to impact the area
late this afternoon into this evening and have the potential to
produce severe weather and localized flash flooding. Additional
rounds of showers and thunderstorms are expected Sunday and
Monday with a continuing threat for both severe weather and
flash flooding.

&&

.DISCUSSION...
KEY MESSAGE 1...Dangerous heat and humidity will diminish
overnight. Heat will continue to diminish Sunday and especially
Monday.

The excessive heat and heat advisory headlines have been taken
down at 8 PM. While still very hot across NJ, the approaching
thunderstorms and rains will being cooler conditions overnight.
It will be notably cooler temperatures are expected across the
region on Sunday, with high temperatures generally in the upper
80s across most of eastern PA and NJ, and low 90s for the urban
corridor as well as Delmarva. However the cumulative impacts of
the heat are still going to likely take a toll of the region.
With dewpoints remaining in the upper 60s to mid 70s, with heat
indices getting into the mid 90s to low 100s from the Philly
metro and south. We will consider more Heat headlines (likely
Advisories) later tonight.

By Monday, with a frontal boundary draped across the area, much
cooler temperatures are expected. Placement of the front is uncertain,
but north of the front temperatures will likely only be in the mid
70s, and low to mid 80s to the south. South of the front where temperatures
are still fairly warm, the forecast remains complicated by the potential
for widespread showers and storms.

KEY MESSAGE 2...Showers and thunderstorms are expected to impact the
area this evening and have the potential to produce severe weather
and localized flash flooding. Additional rounds of showers and
thunderstorms are expected Sunday and Monday with a continuing
threat for both severe weather and flash flooding.

Severe Thunderstorm Watch #459 is in effect for the entire
County Warning area until 11PM.

The mid-level ridge over the area will continue breaking down
this afternoon and evening as a mid and upper level trough
pivots across eastern Canada. Strong vertical mixing has
already set the stage with substantial instability across the
region. The CU field is beginning to bubble up across to the
south and towards the north showing that conditions for Severe
weather are developing rapidly across the area. ML CAPE values
are progged to once again reach 2000+ j/kg with increasing
amounts of shear compared to Friday. 0-3/0-6 km shear values
look to be upwards of 30/40 knots by later today. Steep low and
mid-level lapse rates will result in very high DCAPE values
already showing up on SPC's meso A website. Damaging winds will
be the biggest threat but PWATs close to 2 inches will also
support at least a localized flash flooding threat. The biggest
change in the guidance was that we're expecting the storms to
trigger maybe an hour or so later than initially forecast this
morning with the main threat still in the 7 - 11pm time frame.
We certainly can't rule out any isolated convection that
develops ahead of the more significant forcing so the overall
time of concern is from 3pm to 11pm. Heading into the overnight
period, the threat of severe weather reduces however there is
some signal of potential training of storms leading to heavy
rainfall over the urban corridor. Will be paying very close
attention to rainfall rates as flash flooding is an increasing
concern.

On Sunday, the severe weather threat is generally anticipated to
remain from mainly the Philly metro and points south, but this
will be dependent on frontal placement. However, widespread
showers and storms are also expected north of the front. In
fact, model guidance is indicating PWATs potentially exceeding 2
inches, which is above the 90th percentile for this time of
year and near the daily observed maximum. CAPE also looks to be
tall and "skinny", another setup that favors heavy rainfall.
Given these factors, rainfall rates in storms could exceed 1 to
2 inches per hour and it's possible storms may also train over
the same areas. The WPC has continues to indicated a Slight Risk
(2 of 4) for the I-95 corridor and points west both Sunday and
Monday, with a Marginal Risk (1 of 4) for the remainder of the
area. Storms could last into a good portion of the night Sunday
night. The severe threat should diminish by the overnight but
the flash flood threat may continue.

Unfortunately the aformentioned front is likely to remain
stalled near the area Monday as an upper level trough approaches
from the west. This will lead to additional widespread showers
and storms. The severe weather threat looks to be lower by this
time but the flash flood threat will remain elevated, especially
since the same areas have the potential of being hit with
multiple rounds of showers/storms over successive days.

Even into next Tuesday there could be more showers and storms before
the front should finally push south of the area by Wednesday
leading to the weather trending drier.

&&

.AVIATION /00Z SUNDAY THROUGH THURSDAY/...
The following discussion is for KPHL, KPNE, KTTN, KABE, KRDG,
KILG, KMIV, KACY and surrounding areas.

Tonight...Showers and storms likely to affect most TAF sites in
the evening bringing brief restrictions to IFR along with the
potential for strong wind gusts that could briefly exceed 40 to
45 knots. Showers/storms should largely be done by the overnight
period but can't rule out some localized fog/mist forming.

Outlook...

Sunday through Monday night...Scattered to widespread showers
and thunderstorms with sub-VFR conditions expected at times.

Tuesday through Wednesday...Primarily VFR. Isolated to
scattered showers and storms will be possible, especially in the
afternoon hours each day, which could lead to brief periods of
sub-VFR conditions.

&&

.MARINE...
Southwest winds 10-15 kt this afternoon, with some gusts up to 20
knots nearshore by mid to late afternoon with the increasing
seabreeze. Some heavy showers and strong to severe storms could
affect the waters this evening, leading to locally strong winds over
40 knots and reduced visibilities.

Outlook...

No marine headlines are currently anticipated through Wednesday,
with winds below 25 kt and seas remaining below 5 ft. Relatively
benign boating conditions are expected outside of thunderstorms.
However, a cold front drops into the area then stalls and slowly
weakens over the local waters. That front will be the focus for
additional showers and storms possible each day through Tuesday,
with activity being the most widespread Sunday afternoon/evening
and again on Monday afternoon. Reduced visibility and strong winds
remain possible with the strongest storms.

Winds back to the E-NE behind the front tomorrow afternoon and
evening through midweek. This will build seas slightly Monday
afternoon through Wednesday, especially north of Barnegat Light,
though again remaining below 5 ft.

Rip Currents...

For Sunday, winds will be from the east around 10 mph with gusts up
to 15 mph in the afternoon. Breaking waves will be around 1-2 feet
or less. There will be a weak southeast swell with a period around 8
seconds. This results in a LOW risk for the development of dangerous
and life threatening rip currents at the Jersey Shore and at
Delaware Beaches.

For Monday, winds remain east around 10 to 15 kt, with gusts to 20
kt in the afternoon. Resulting increasing NE wind wave could drive
an elevated MODERATE Rip Current Risk along the Jersey Shore, with
LOW risk persisting over the Delaware Beaches.

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

&&

.CLIMATE...
The record breaking heat is forecast to continue across our area
through today. Temperature records for our climate sites are
listed below:

All Time Record High Temperatures

Site                  Record / Date
Allentown (ABE)          105 / July 3, 1966
AC Airport (ACY)         106 / June 28, 1969
AC Marina (55N)          104 / August 7, 1918
Georgetown (GED)         104 / July 22 & 23, 2011
Mount Pocono (MPO)       103 / July 3, 1911
Philadelphia (PHL)       106 / August 7, 1918
Reading (RDG)            106 / July 22, 2011
Trenton (TTN)            106 / July 9, 1936 & July 22, 2011
Wilmington (ILG)         107 / August 7, 1918

All Time Record Warmest Low Temperatures

Site                  Record / Date
Allentown (ABE)           79 / July 15, 1995
AC Airport (ACY)          84 / July 23, 2011
AC Marina (55N)           82 / July 21, 2019
Georgetown (GED)          84 / July 23, 2011
Mount Pocono (MPO)        76 / July 12, 1952
Philadelphia (PHL)        83 / July 24, 2010 & July 23, 2011
Reading (RDG)             81 / August 7, 1918
Trenton (TTN)             84 / August 11, 1895
Wilmington (ILG)          84 / August 7, 1918

Record Number of Consecutive 100+ Degree Days

Site                  Record / Date
Allentown (ABE)       3 days / July 9-11, 1936 & July 2-4, 1966
AC Airport (ACY)      3 days / July 2-4, 1966 & July 22-24, 2011
AC Marina (55N)        1 day / Occurred multiple times
Georgetown (GED)      2 days / Most recent June 24-25, 2025
Mount Pocono (MPO)     1 day / July 3, 1911
Philadelphia (PHL)    3 days / July 2-4, 1966 & July 8-10, 1993
Reading (RDG)         3 days / Most recent July 21-23, 2011
Trenton (TTN)         3 days / Most recent July 21-23, 2011
Wilmington (ILG)      3 days / Most recent July 9-11, 1936

Record High Temperatures
                          July 4
Site                  Record / Year
Allentown (ABE)          102 / 1949
AC Airport (ACY)         102 / 1966
AC Marina (55N)           99 / 1966
Georgetown (GED)         100 / 1966
Mount Pocono (MPO)        99 / 1911
Philadelphia (PHL)       103 / 1966
Reading (RDG)            100 / 1911 & 1966
Trenton (TTN)             99 / 1919, 1999, & 2010
Wilmington (ILG)         102 / 1966

Record Warmest Low Temperatures
                          July 4
Site                  Record / Year
Allentown (ABE)           75 / 1999
AC Airport (ACY)          75 / 1974, 1983, 1999, & 2002
AC Marina (55N)           79 / 2002
Georgetown (GED)          75 / 1999 & 2012
Mount Pocono (MPO)        70 / 2002 & 2013
Philadelphia (PHL)        79 / 1919
Reading (RDG)             78 / 1966
Trenton (TTN)             78 / 1966
Wilmington (ILG)          76 / 1999

&&

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

&&

DISCUSSION...Cooper/Fitzsimmons/MPS/RCM/Staarmann/po
AVIATION...Cooper/Fitzsimmons/RCM/po
MARINE...Cooper/Fitzsimmons/MJL/MPS/RCM
Hazardous weather outlook, Jul 4, 5:03 AM EDT, 17 hours 49 minutes before
Hazardous Weather Outlook
National Weather Service Mount Holly NJ
503 AM EDT Sat Jul 4 2026

MDZ012-015-019-020-050915-
Kent MD-Queen Annes-Talbot-Caroline-
503 AM EDT Sat Jul 4 2026

...EXTREME HEAT WARNING IN EFFECT UNTIL 8 PM EDT THIS EVENING...

This Hazardous Weather Outlook is for northeast Maryland.

.DAY ONE...Today and tonight.

Please listen to NOAA Weather Radio or go to weather.gov on the
Internet for more information about the following hazards.

   Extreme Heat Warning.

In addition to the extreme heat, severe thunderstorms are possible
late this afternoon and evening.

.DAYS TWO THROUGH SEVEN...Sunday through Friday.

Severe thunderstorms are possible Sunday afternoon and evening.

.SPOTTER INFORMATION STATEMENT...

Weather spotters are encouraged to report significant weather
conditions according to standard operating procedures.

In the hours before

Local storm report, Jul 4, 10:36 PM EDT, 16 minutes before
Preliminary Local Storm Report
National Weather Service Mount Holly NJ
1036 PM EDT Sat Jul 4 2026

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

1020 PM     Marine Tstm Wind 1 SSE Harvey Cedars     39.70N 74.13W
07/04/2026  M46 MPH          ANZ451             NJ   Mesonet

            Harvey Cedars mesonet.

&&

Hoeflich
Local storm report, Jul 4, 10:37 PM EDT, 15 minutes before
Preliminary Local Storm Report
National Weather Service Mount Holly NJ
1037 PM EDT Sat Jul 4 2026

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

1033 PM     Tstm Wnd Gst     1 N Mantoloking         40.06N 74.05W
07/04/2026  M58 MPH          Ocean              NJ   Mesonet

            Brick mesonet.

&&

Hoeflich
Local storm report, Jul 4, 10:38 PM EDT, 14 minutes before
Preliminary Local Storm Report
National Weather Service Mount Holly NJ
1038 PM EDT Sat Jul 4 2026

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

1033 PM     Tstm Wnd Gst     1 ENE Mantoloking       40.04N 74.04W
07/04/2026  M58 MPH          ANZ451             NJ   Mesonet

            Brick mesonet.

&&

Hoeflich
Local storm report, Jul 4, 10:40 PM EDT, 12 minutes before
Preliminary Local Storm Report
National Weather Service Mount Holly NJ
1040 PM EDT Sat Jul 4 2026

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

1039 PM     Marine Tstm Wind 1 NE Monmouth Beach     40.34N 73.97W
07/04/2026  M41 MPH          ANZ450             NJ   Mesonet

            Monmouth Beach Mesonet.

&&

Hoeflich
Local storm report, Jul 4, 10:47 PM EDT, 5 minutes before
Preliminary Local Storm Report
National Weather Service Mount Holly NJ
1047 PM EDT Sat Jul 4 2026

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

1030 PM     Marine Tstm Wind 1 ENE Manasquan         40.13N 74.02W
07/04/2026  M42 MPH          ANZ450             NJ   Mesonet

            Sea Girt Mesonet.

&&

Hoeflich
Local storm report, Jul 4, 10:51 PM EDT, 1 minute before
Preliminary Local Storm Report
National Weather Service Mount Holly NJ
1051 PM EDT Sat Jul 4 2026

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0649 PM     Tstm Wnd Dmg     Analomink               41.05N 75.22W
07/04/2026                   Monroe             PA   Public

            Reports of trees, wires down, and buildings
            damaged around a campground in the East
            Stroudsburg Area. Time estimated from radar.

&&

Hoeflich

The office that day

Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Jul 4, 8:17 PM EDTSevere Thunderstorm WarningPHIKent, New Castle43 min
Jul 4, 8:38 PM EDTSevere Thunderstorm WarningPHINew Castle52 min
Jul 4, 8:48 PM EDTSevere Thunderstorm WarningPHIKent, New Castle57 min
Jul 4, 8:59 PM EDTSevere Thunderstorm WarningPHINew Castle46 min
Jul 4, 9:07 PM EDTSevere Thunderstorm WarningPHISussex22 min
Jul 4, 9:52 PM EDTSevere Thunderstorm WarningPHISussex38 min
Jul 5, 2:33 AM EDTFlood WatchPHINew Castle41 hr
Jul 5, 5:08 PM EDTSevere Thunderstorm WarningPHIKent, Sussex52 min
Jul 5, 6:54 PM EDTSevere Thunderstorm WarningPHIKent36 min
Jul 5, 7:04 PM EDTSevere Thunderstorm WarningPHIKent, New Castle41 min
Jul 4, 8:20 PM EDTSpecial Marine WarningPHI85 min
Jul 4, 8:28 PM EDTSevere Thunderstorm WarningPHIHunterdon, Warren62 min
Jul 4, 9:13 PM EDTSevere Thunderstorm WarningPHIAtlantic, Burlington, Camden, Cumberland, Gloucester, Salem62 min
Jul 4, 9:15 PM EDTSevere Thunderstorm WarningPHIBurlington, Hunterdon, Mercer, Middlesex, Monmouth, Somerset75 min
Jul 4, 9:24 PM EDTSpecial Marine WarningPHI66 min
Jul 4, 9:25 PM EDTSpecial Marine WarningPHI65 min
Jul 4, 9:38 PM EDTSpecial Marine WarningPHI97 min
Jul 4, 9:41 PM EDTSevere Thunderstorm WarningPHIAtlantic, Cape May, Cumberland, Ocean49 min
Jul 4, 9:50 PM EDTSevere Thunderstorm WarningPHIAtlantic, Burlington, Monmouth, Ocean55 min
Jul 4, 10:04 PM EDTSpecial Marine WarningPHI56 min
Jul 4, 10:52 PM EDTSpecial Marine WarningPHI83 min
Jul 4, 11:08 PM EDTSpecial Marine WarningPHI47 min
Jul 5, 7:06 PM EDTSpecial Marine WarningPHI47 min
Jul 5, 7:30 PM EDTFlash Flood WarningPHIBurlington, Mercer2 hr
Jul 5, 6:28 PM EDTSevere Thunderstorm WarningPHICaroline, Kent, Queen Anne's, Talbot47 min
Jul 4, 8:25 PM EDTSevere Thunderstorm WarningPHIBerks, Bucks, Chester, Delaware, Montgomery, Philadelphia65 min
Jul 5, 7:33 PM EDTSevere Thunderstorm WarningPHIBucks, Montgomery, Philadelphia28 min

Nearby

Heat Advisories in New Jersey, 2026Heat Advisories in Pennsylvania, 2026Heat Advisories in Maryland, 2026Every heat advisory in 2026

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.