Alert archive / New Jersey / Heat Advisories in 2026

Heat Advisory 10, NWS Philadelphia/Mount Holly

September 2, 20264 states

NWS Philadelphia/Mount Holly issued this heat advisory at Sep 2, 2026, 3:53 AM EDT for 4 states. It took effect at Sep 3, 2026, 11:00 AM EDT. It was in force for 8 hr.

The area

The counties it named.

The facts

Issued
Sep 2, 2026, 3:53 AM EDT (07:53 UTC)
In effect from
Sep 3, 2026, 11:00 AM EDT
Expired
Sep 3, 2026, 7:26 PM EDT
In force
8 hr
Issued by
NWS Philadelphia/Mount Holly

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, Burlington County, NJ, Camden County, NJ, Gloucester County, NJ, Mercer County, NJ, Monmouth County, NJ, Ocean County, NJ, Berks County, PA, Bucks County, PA, Chester County, PA, Delaware County, PA, Montgomery County, PA, Philadelphia County, PA

The radar

The Philadelphia radar (KDIX), 84 km from the middle of the area, began a volume at 07:56 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

Washington/Dulle, VA (KIAD), launched 00:00Z, 7.9 hours before the alert went out and 196 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, Washington/Dulle, VA at 00:00Z on 2026-09-02Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1278 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, Washington/Dulle, VA at 00:00Z on 2026-09-02The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 79 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
1278 J/kg
Mixed-layer CIN
-44 J/kg
Mixed-layer LCL
1771 m above ground
0-6 km bulk shear
33 kt
0-1 km storm-relative helicity
79 m²/s²
0-3 km storm-relative helicity
86 m²/s²
Significant tornado parameter
0.1
Supercell composite
4.1

Open this sounding in Storm Lab

The text

As transmitted.

051 
WWUS71 KPHI 020753
NPWPHI

URGENT - WEATHER MESSAGE
National Weather Service Mount Holly NJ
353 AM EDT Wed Sep 2 2026

DEZ001-NJZ017>019-PAZ070-071-104-106-022100-
/O.NEW.KPHI.HT.Y.0010.260903T1500Z-260904T0000Z/
New Castle-Gloucester-Camden-Northwestern Burlington-Delaware-
Philadelphia-Eastern Montgomery-Lower Bucks-
Including the cities of Mount Holly, Lansdale, Moorestown,
Doylestown, Wilmington, Camden, Cherry Hill, Morrisville,
Philadelphia, Glassboro, Norristown, and Media
353 AM EDT Wed Sep 2 2026

...HEAT ADVISORY IN EFFECT FROM 11 AM TO 8 PM EDT THURSDAY...

* WHAT...Heat index values up to 102 degrees expected.

* WHERE...In Delaware, New Castle County. In New Jersey, Camden,
  Gloucester, and Northwestern Burlington Counties. In Pennsylvania,
  Delaware, Eastern Montgomery, Lower Bucks, and Philadelphia
  Counties.

* WHEN...From 11 AM to 8 PM EDT Thursday.

* 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>015-020-027-PAZ060-101>103-022100-
/O.NEW.KPHI.HT.Y.0010.260903T1500Z-260904T0000Z/
Western Monmouth-Eastern Monmouth-Mercer-Ocean-Southeastern
Burlington-Berks-Western Chester-Eastern Chester-Western
Montgomery-
Including the cities of Freehold, West Chester, Reading, Oxford,
Wharton State Forest, Honey Brook, Pottstown, Sandy Hook, Jackson,
Trenton, Kennett Square, and Collegeville
353 AM EDT Wed Sep 2 2026

...HEAT ADVISORY IN EFFECT FROM 11 AM TO 8 PM EDT THURSDAY...

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

* WHERE...In New Jersey, Eastern Monmouth, Mercer, Western Monmouth,
  Ocean, and Southeastern Burlington Counties. In Pennsylvania,
  Berks, Eastern Chester, Western Chester, and Western Montgomery
  Counties.

* WHEN...From 11 AM to 8 PM EDT Thursday.

* 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.

&&

$$

Staarmann
4 follow-up statements
929 
WWUS71 KPHI 021810
NPWPHI

URGENT - WEATHER MESSAGE
National Weather Service Mount Holly NJ
210 PM EDT Wed Sep 2 2026

DEZ002-003-MDZ012-015-019-020-030900-
/O.EXA.KPHI.HT.Y.0010.260903T1500Z-260904T0000Z/
Kent-Inland Sussex-Kent MD-Queen Annes-Talbot-Caroline-
Including the cities of Centreville, Georgetown, Chestertown, Easton,
Dover, and Denton
210 PM EDT Wed Sep 2 2026

...HEAT ADVISORY IN EFFECT FROM 11 AM TO 8 PM EDT THURSDAY...

* WHAT...Heat index values up to 105 degrees expected.

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

* WHEN...From 11 AM to 8 PM EDT Thursday.

* 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.

&&

$$

DEZ001-NJZ017>019-PAZ070-071-104-106-030900-
/O.CON.KPHI.HT.Y.0010.260903T1500Z-260904T0000Z/
New Castle-Gloucester-Camden-Northwestern Burlington-Delaware-
Philadelphia-Eastern Montgomery-Lower Bucks-
Including the cities of Wilmington, Philadelphia, Morrisville,
Doylestown, Moorestown, Camden, Lansdale, Media, Glassboro, Cherry
Hill, Mount Holly, and Norristown
210 PM EDT Wed Sep 2 2026

...HEAT ADVISORY REMAINS IN EFFECT FROM 11 AM TO 8 PM EDT THURSDAY...

* WHAT...Heat index values up to 101 degrees expected.

* WHERE...In Delaware, New Castle County. In New Jersey, Camden,
  Gloucester, and Northwestern Burlington Counties. In Pennsylvania,
  Delaware, Eastern Montgomery, Lower Bucks, and Philadelphia
  Counties.

* WHEN...From 11 AM to 8 PM EDT Thursday.

* 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>015-020-027-PAZ060-101>103-030900-
/O.CON.KPHI.HT.Y.0010.260903T1500Z-260904T0000Z/
Western Monmouth-Eastern Monmouth-Mercer-Ocean-Southeastern
Burlington-Berks-Western Chester-Eastern Chester-Western
Montgomery-
Including the cities of Honey Brook, Oxford, Pottstown, Freehold,
Sandy Hook, Trenton, West Chester, Reading, Jackson, Wharton State
Forest, Collegeville, and Kennett Square
210 PM EDT Wed Sep 2 2026

...HEAT ADVISORY REMAINS IN EFFECT FROM 11 AM TO 8 PM EDT THURSDAY...

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

* WHERE...In New Jersey, Eastern Monmouth, Mercer, Western Monmouth,
  Ocean, and Southeastern Burlington Counties. In Pennsylvania,
  Berks, Eastern Chester, Western Chester, and Western Montgomery
  Counties.

* WHEN...From 11 AM to 8 PM EDT Thursday.

* 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.

&&

$$

Guzzo
752 
WWUS71 KPHI 030526
NPWPHI

URGENT - WEATHER MESSAGE
National Weather Service Mount Holly NJ
126 AM EDT Thu Sep 3 2026

DEZ001-NJZ017>019-PAZ070-071-104-106-032000-
/O.CON.KPHI.HT.Y.0010.260903T1500Z-260904T0000Z/
New Castle-Gloucester-Camden-Northwestern Burlington-Delaware-
Philadelphia-Eastern Montgomery-Lower Bucks-
Including the cities of Camden, Cherry Hill, Moorestown, Doylestown,
Lansdale, Media, Mount Holly, Morrisville, Philadelphia, Norristown,
Glassboro, and Wilmington
126 AM EDT Thu Sep 3 2026

...HEAT ADVISORY REMAINS IN EFFECT FROM 11 AM THIS MORNING TO 8 PM
EDT THIS EVENING...

* WHAT...Heat index values up to 102 expected.

* WHERE...In Delaware, New Castle County. In New Jersey, Camden,
  Gloucester, and Northwestern Burlington Counties. In Pennsylvania,
  Delaware, Eastern Montgomery, Lower Bucks, and Philadelphia
  Counties.

* WHEN...From 11 AM this morning to 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.

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.

&&

$$

DEZ002-003-MDZ012-015-019-020-032000-
/O.CON.KPHI.HT.Y.0010.260903T1500Z-260904T0000Z/
Kent-Inland Sussex-Kent MD-Queen Annes-Talbot-Caroline-
Including the cities of Georgetown, Dover, Denton, Easton,
Chestertown, and Centreville
126 AM EDT Thu Sep 3 2026

...HEAT ADVISORY REMAINS IN EFFECT FROM 11 AM THIS MORNING TO 8 PM
EDT THIS EVENING...

* WHAT...Heat index values up to 106 expected.

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

* WHEN...From 11 AM this morning to 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.

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>015-020-027-PAZ060-101>103-032000-
/O.CON.KPHI.HT.Y.0010.260903T1500Z-260904T0000Z/
Western Monmouth-Eastern Monmouth-Mercer-Ocean-Southeastern
Burlington-Berks-Western Chester-Eastern Chester-Western
Montgomery-
Including the cities of Reading, Freehold, Sandy Hook, Jackson,
Kennett Square, Trenton, Honey Brook, Collegeville, Wharton State
Forest, West Chester, Pottstown, and Oxford
126 AM EDT Thu Sep 3 2026

...HEAT ADVISORY REMAINS IN EFFECT FROM 11 AM THIS MORNING TO 8 PM
EDT THIS EVENING...

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

* WHERE...In New Jersey, Eastern Monmouth, Mercer, Western Monmouth,
  Ocean, and Southeastern Burlington Counties. In Pennsylvania,
  Berks, Eastern Chester, Western Chester, and Western Montgomery
  Counties.

* WHEN...From 11 AM this morning to 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.

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.

&&

$$
587 
WWUS71 KPHI 031803
NPWPHI

URGENT - WEATHER MESSAGE
National Weather Service Mount Holly NJ
203 PM EDT Thu Sep 3 2026

DEZ001-NJZ017>019-PAZ070-071-104-106-040000-
/O.CON.KPHI.HT.Y.0010.000000T0000Z-260904T0000Z/
New Castle-Gloucester-Camden-Northwestern Burlington-Delaware-
Philadelphia-Eastern Montgomery-Lower Bucks-
Including the cities of Philadelphia, Glassboro, Doylestown, Camden,
Lansdale, Media, Mount Holly, Cherry Hill, Wilmington, Morrisville,
Moorestown, and Norristown
203 PM EDT Thu Sep 3 2026

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

* WHAT...Heat index values up to 102.

* WHERE...In Delaware, New Castle County. In New Jersey, Camden,
  Gloucester, and Northwestern Burlington Counties. In Pennsylvania,
  Delaware, 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.

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.

&&

$$

DEZ002-003-MDZ012-015-019-020-040000-
/O.CON.KPHI.HT.Y.0010.000000T0000Z-260904T0000Z/
Kent-Inland Sussex-Kent MD-Queen Annes-Talbot-Caroline-
Including the cities of Dover, Georgetown, Denton, Chestertown,
Centreville, and Easton
203 PM EDT Thu Sep 3 2026

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

* WHAT...Heat index values up to 106.

* WHERE...In Delaware, Kent 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.

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>015-020-027-PAZ060-101>103-040000-
/O.CON.KPHI.HT.Y.0010.000000T0000Z-260904T0000Z/
Western Monmouth-Eastern Monmouth-Mercer-Ocean-Southeastern
Burlington-Berks-Western Chester-Eastern Chester-Western
Montgomery-
Including the cities of Wharton State Forest, Kennett Square,
Pottstown, Honey Brook, Trenton, West Chester, Jackson, Sandy Hook,
Collegeville, Oxford, Reading, and Freehold
203 PM EDT Thu Sep 3 2026

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

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

* WHERE...In New Jersey, Eastern Monmouth, Mercer, Western Monmouth,
  Ocean, and Southeastern Burlington Counties. In Pennsylvania,
  Berks, Eastern Chester, 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.

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.

&&

$$
084 
WWUS71 KPHI 032326
NPWPHI

URGENT - WEATHER MESSAGE
National Weather Service Mount Holly NJ
726 PM EDT Thu Sep 3 2026

DEZ001>003-MDZ012-015-019-020-NJZ013>015-017>020-027-PAZ060-070-071-
101>104-106-040030-
/O.CAN.KPHI.HT.Y.0010.000000T0000Z-260904T0000Z/
New Castle-Kent-Inland Sussex-Kent MD-Queen Annes-Talbot-Caroline-
Western Monmouth-Eastern Monmouth-Mercer-Gloucester-Camden-
Northwestern Burlington-Ocean-Southeastern Burlington-Berks-
Delaware-Philadelphia-Western Chester-Eastern Chester-Western
Montgomery-Eastern Montgomery-Lower Bucks-
Including the cities of Doylestown, Centreville, Camden, Mount Holly,
Trenton, Media, Lansdale, Wharton State Forest, Jackson, Easton,
Glassboro, Denton, Georgetown, Cherry Hill, Oxford, Chestertown,
Honey Brook, Kennett Square, Norristown, Morrisville, Sandy Hook,
Collegeville, West Chester, Moorestown, Wilmington, Freehold, Dover,
Philadelphia, Pottstown, and Reading
726 PM EDT Thu Sep 3 2026

...HEAT ADVISORY IS CANCELLED...

Heat index values are below 100 degrees.

$$

MPS

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 Sep 2, 1:40 AM EDT, 2 hours 13 minutes earlier. Its key messages:

  • 1. Today into tonight, a shortwave trough could spark another round of showers and storms, but it will be working against a relatively stable boundary layer. 2. Hot and humid conditions are forecast across the region on Thursday. 3. Unsettled conditions will continue on Thursday with the potential for severe thunderstorms. Scattered thunderstorms are again possible on Friday, mainly from Philadelphia south. 4. The Labor Day Weekend will feature mostly dry weather with at or below normal temperatures and lower humidity.
Area forecast discussion, Sep 2, 1:40 AM EDT, 2 hours 13 minutes before
Area Forecast Discussion
National Weather Service Mount Holly NJ
140 AM EDT Wed Sep 2 2026

.WHAT HAS CHANGED...
Aviation section updated for the 06Z TAF issuance.

For today into tonight, confidence in storm coverage and
intensity remains low.

The chance for showers and thunderstorms shifted a bit north on
Friday. Friday afternoon high temperatures also inched up a few
degrees.

&&

.KEY MESSAGES...
1. Today into tonight, a shortwave trough could spark another
round of showers and storms, but it will be working against a
relatively stable boundary layer.

2. Hot and humid conditions are forecast across the region on
Thursday.

3. Unsettled conditions will continue on Thursday with the
potential for severe thunderstorms. Scattered thunderstorms are
again possible on Friday, mainly from Philadelphia south.

4. The Labor Day Weekend will feature mostly dry weather with
at or below normal temperatures and lower humidity.

&&

.DISCUSSION...
KEY MESSAGE 1...Today into tonight, a shortwave trough could
spark another round of showers and storms, but it will be
working against a relatively stable boundary layer.

A cold front currently situated across central portions of the
region continues to sink southward, and should continue to make
southwestward progress through this morning. This will leave our
region in the relatively cooler and more stable air mass north
of the front. The net result is that our region should be in
northeasterly flow, and relatively cloudy conditions for much of
the day. As a result, surface based instability is expected to
be very limited, with mostly elevated instability present.

Consequently, the risk for severe storms is still quite
conditional and uncertain. Given how sharp of a mid level short
wave trough is approaching, there will be ample forcing, but it
is a question of if the elevated instability will be enough to
sustain storms in our region.

With that said, some CAMs do feature storms moving into parts
of the area late this afternoon and into tonight. Confidence in
details is relatively low, but should the region experience more
destabilization than is currently anticipated, storms will be
capable of damaging winds, some hail, and perhaps an isolated
tornado.

KEY MESSAGE 2...Hot and humid conditions are forecast across
the region on Thursday.

After a cool down on Wednesday for most neighborhoods (5 to 10
degrees lower - less across Delmarva), hot and humid conditions are
once again expected across the region on Thursday as the frontal
boundary lifts north. With the front to the north, high temperatures
are forecast to climb into the upper 80s to mid 90s for many areas
(around 80 or low 80s far N and W). These temperatures combined with
dewpoints in the low to mid 70s will again result in heat indices
well into the 90s to low 100s south of I-78, perhaps even as high as
105 degrees for Delmarva.

Another Heat Advisory may be needed for portions of the area on
Thursday if this trend continues.

KEY MESSAGE 3...Unsettled conditions will continue on Thursday
with the potential for severe thunderstorms. Scattered
thunderstorms are again possible on Friday, mainly from
Philadelphia south.

Another round of severe thunderstorms are possible on Thursday.
Friday could also experience a few severe storms across Delmarva,
depending on how quickly the frontal boundary pushes south.

SPC has a Slight Risk (level 2 out of 5) for severe thunderstorms
on Thursday from about Wilmington to Wildwood NJ southward and a
Marginal Risk (level 1) to the north of this.

The northwest flow pattern will remain in place on Thursday and will
continue to be supportive of all severe threats, including damaging
winds, large hail, and a few tornadoes, depending on how all the
mesoscale details pan out. The threat for flash flooding is
typically lower with these patterns, but not zero. Training can
still occur and a single locale could have multiple days with heavy
rainfall.

Friday's SPC's 15% probabilities for severe thunderstorms have
shifted just south of our Delmarva zones, though there is still some
uncertainty with this. Our latest forecast has about a 30-40% chance
of showers and thunderstorms south of about Philadelphia.

KEY MESSAGE 4...The Labor Day Weekend will feature mostly dry
weather with at or below normal temperatures and lower humidity.

By Saturday, current model consensus indicates the frontal boundary
will be pushing south of our region with Canadian high pressure
building across the Northeast and Mid-Atlantic. This will largely
end any shower and thunderstorm potential. Thus, Labor Day Weekend
is still shaping up to feature nice weather, with temperatures
trending at or slightly below normal and lower humidity. The only
road bump at the moment, could be a cold front that approaches the
forecast area very late on Monday.

&&

.AVIATION /06Z WEDNESDAY THROUGH SUNDAY/...
Through 12Z...MVFR and IFR ceilings are expected to rapidly
spread across the terminals through 09Z. Winds may briefly be
light and variable for a time before settling out of the
northeast around 5 kts. Some patchy BR is possible at times. Low
confidence.

Today...MVFR ceilings may remain through much of the day. There
is a 20 to 40% chance for showers and storms through the day
time that could also result in restrictions, however, there is
considerable uncertainty to the extent of storm development
tomorrow. Winds through much of the morning are expected to be
out of the northeast at 5-10 kts, before shifting more east-
southeasterly by 18-21Z. Low confidence.

Tonight...MVFR or IFR ceilings. Scattered showers and storms
are possible, but there is low confidence in coverage and
intensity. Visibility restrictions are likely in any stronger
storms. East- southeast winds around 5 kts. Low confidence.

Outlook...

Thursday and Friday...Sub-VFR conditions are possible in
showers and thunderstorms each day (20-40% chance), mainly
during the afternoon to evening hours.

Saturday and Sunday...Primarily VFR conditions expected.

&&

.MARINE...
Winds and seas are expected to stay below Small Craft Advisory
conditions. However, gusty and erratic winds are possible in the
vicinity of any storms, particularly tonight.

Outlook...

Thursday through Sunday...Sub-SCA conditions are expected through
the period. There is a chance (40 to 50%) for thunderstorms
Thursday, mainly in the afternoon and evening hours. For Friday, the
chance of thunderstorms (30 to 40%) shifts south a bit, basically
extending from Manasquan Inlet, NJ down to Fenwick Island, DE.

Rip Currents...

On Wednesday, northeast flow will range from 10 to 15 mph with
gusts up to 20 mph along the New Jersey coast. There will be
southeast swells with a period around 10 seconds and breaking
waves of 2 to 3 feet. As a result, there is a MODERATE risk for
the development of dangerous and life threatening rip currents
for the Jersey Shore along Monmouth, Ocean, and Atlantic
counties, and a LOW risk for the development of dangerous and
life threatening rip currents for the Jersey Shore in Cape May
county and Delaware Beaches.

For Thursday, winds become southwest at 10 to 15 mph with gusts
up to 20 mph along the Jersey Shore. Breaking waves will range
from 1 to 3 feet with light easterly swells with a period around
6 seconds. As a result, there is a MODERATE risk for the
development of dangerous and life threatening rip currents for
the Jersey Shore along Monmouth, Ocean, and Atlantic counties,
and a LOW risk for the development of dangerous and life
threatening rip currents for the Jersey Shore in Cape May county
and Delaware Beaches.

&&

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

&&

DISCUSSION...Cooper/WFO PHI
AVIATION...Cooper/WFO PHI
MARINE...MPS
Hazardous weather outlook, Sep 1, 5:07 AM EDT, 22 hours 46 minutes before
Hazardous Weather Outlook
National Weather Service Mount Holly NJ
507 AM EDT Tue Sep 1 2026

MDZ012-015-019-020-020915-
Kent MD-Queen Annes-Talbot-Caroline-
507 AM EDT Tue Sep 1 2026

This Hazardous Weather Outlook is for northeast Maryland.

.DAY ONE...Today and tonight.

Severe thunderstorms are possible this evening. Heat indicies will
be in the low 100s this afternoon.

.DAYS TWO THROUGH SEVEN...Wednesday through Monday.

Severe thunderstorms are possible Wednesday and Thursday. Heat
indicies will be in the upper 90s to low 100s Wednesday and
Thursday.

.SPOTTER INFORMATION STATEMENT...

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

Staarmann

In the hours before

Local storm report, Sep 2, 1:44 AM EDT, 2 hours 9 minutes before
Preliminary Local Storm Report
National Weather Service Mount Holly NJ
144 AM EDT Wed Sep 2 2026

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

0832 PM     Tstm Wnd Dmg     Newark                  39.68N 75.75W
09/01/2026                   New Castle         DE   911 Call Center

            Trees down in Newark. Time estimated from
            radar.

&&

Staarmann
Local storm report, Sep 2, 1:55 AM EDT, 1 hour 58 minutes before
Preliminary Local Storm Report
National Weather Service Mount Holly NJ
155 AM EDT Wed Sep 2 2026

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

0835 PM     Tstm Wnd Dmg     Pennsville              39.65N 75.52W
09/01/2026                   Salem              NJ   911 Call Center

            Multiple reports of trees and wires down
            around Pennsville. Time estimated from
            radar.

&&

Staarmann
Local storm report, Sep 2, 2:13 AM EDT, 1 hour 40 minutes before
Preliminary Local Storm Report
National Weather Service Mount Holly NJ
213 AM EDT Wed Sep 2 2026

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

0635 PM     Tstm Wnd Dmg     Mahoning Twp            40.81N 75.75W
09/01/2026                   Carbon             PA   911 Call Center

            Tree down in Mahoning Township. Time
            estimated from radar.

&&

Staarmann
Local storm report, Sep 2, 2:16 AM EDT, 1 hour 37 minutes before
Preliminary Local Storm Report
National Weather Service Mount Holly NJ
216 AM EDT Wed Sep 2 2026

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

0640 PM     Tstm Wnd Dmg     East Penn Twp           40.77N 75.74W
09/01/2026                   Carbon             PA   911 Call Center

            Tree down in East Penn Township. Time
            estimated from radar.

&&

Staarmann
Local storm report, Sep 2, 2:27 AM EDT, 1 hour 26 minutes before
Preliminary Local Storm Report
National Weather Service Mount Holly NJ
227 AM EDT Wed Sep 2 2026

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

0903 PM     Tstm Wnd Dmg     Pitman                  39.74N 75.12W
09/01/2026                   Gloucester         NJ   Trained Spotter

            Large tree branch down near Pitman. Time
            estimated from radar.

&&

Staarmann
Local storm report, Sep 2, 2:44 AM EDT, 1 hour 9 minutes before
Preliminary Local Storm Report
National Weather Service Mount Holly NJ
244 AM EDT Wed Sep 2 2026

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

1009 PM     Marine Tstm Wind 1 N Atlantic City       39.38N 74.42W
09/01/2026  M44 MPH          Atlantic           NJ   Other Federal

            USGS gauge at the Atlantic City Marina.

&&

Staarmann

The office that day

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

IssuedProductOfficeCountiesLasted
Sep 1, 8:17 PM EDTSevere Thunderstorm WarningPHINew Castle58 min
Sep 1, 8:44 PM EDTFlash Flood WarningPHINew Castle3 hr
Sep 1, 8:46 PM EDTSevere Thunderstorm Warning Destructive damage threatPHIKent, New Castle59 min
Sep 1, 9:40 PM EDTSevere Thunderstorm WarningPHIKent, New Castle, Sussex65 min
Sep 2, 1:35 PM EDTSevere Thunderstorm WarningPHIKent, New Castle40 min
Sep 2, 2:05 PM EDTSevere Thunderstorm WarningPHIKent, Sussex40 min
Sep 2, 2:38 PM EDTSevere Thunderstorm WarningPHIKent, Sussex47 min
Sep 1, 8:05 PM EDTSpecial Marine WarningPHI85 min
Sep 1, 8:08 PM EDTSevere Thunderstorm WarningPHIBurlington, Mercer, Middlesex, Monmouth, Ocean52 min
Sep 1, 8:11 PM EDTSpecial Marine WarningPHI94 min
Sep 1, 8:26 PM EDTSevere Thunderstorm WarningPHIAtlantic, Camden, Cumberland, Gloucester49 min
Sep 1, 8:57 PM EDTSevere Thunderstorm WarningPHICamden, Gloucester, Salem48 min
Sep 1, 9:04 PM EDTSevere Thunderstorm WarningPHIBurlington, Ocean71 min
Sep 1, 9:07 PM EDTTornado WarningPHIBurlington21 min
Sep 1, 9:16 PM EDTTornado WarningPHIBurlington12 min
Sep 1, 9:19 PM EDTFlash Flood WarningPHIHunterdon, Mercer, Middlesex116 min
Sep 1, 9:22 PM EDTSpecial Marine WarningPHI68 min
Sep 1, 9:25 PM EDTSpecial Marine WarningPHI95 min
Sep 1, 9:26 PM EDTFlash Flood WarningPHIAtlantic, Camden, Gloucester115 min
Sep 1, 9:33 PM EDTSevere Thunderstorm WarningPHIAtlantic, Burlington, Cape May, Ocean57 min
Sep 1, 9:54 PM EDTSevere Thunderstorm WarningPHIAtlantic, Cape May, Cumberland42 min
Sep 1, 10:06 PM EDTSpecial Marine WarningPHI84 min
Sep 1, 10:48 PM EDTSpecial Marine WarningPHI57 min
Sep 1, 11:12 PM EDTSpecial Marine WarningPHI63 min
Sep 2, 12:40 PM EDTSevere Thunderstorm WarningPHIChester65 min
Sep 2, 1:03 PM EDTSevere Thunderstorm WarningPHIKent, Queen Anne's57 min
Sep 2, 1:43 PM EDTSevere Thunderstorm WarningPHICaroline, Kent, Queen Anne's, Talbot47 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.