Severe Thunderstorm Warning 72, NWS Philadelphia/Mount Holly

993 
WWUS51 KPHI 120250
SVSPHI

Severe Weather Statement
National Weather Service Mount Holly NJ
1050 PM EDT Thu Jun 11 2026

NJC005-007-PAC045-091-101-120300-
/O.EXP.KPHI.SV.W.0072.000000T0000Z-260612T0300Z/
Camden NJ-Burlington NJ-Montgomery PA-Philadelphia PA-Delaware PA-
1050 PM EDT Thu Jun 11 2026

...THE SEVERE THUNDERSTORM WARNING FOR NORTHWESTERN CAMDEN...WEST
CENTRAL BURLINGTON...SOUTHEASTERN MONTGOMERY...PHILADELPHIA AND
NORTHEASTERN DELAWARE COUNTIES WILL EXPIRE AT 1100 PM EDT...

The storm which prompted the warning has weakened below severe
limits, and no longer poses an immediate threat to life or property.
Therefore, the warning will be allowed to expire.

A Severe Thunderstorm Watch remains in effect until midnight EDT for
southern New Jersey...and southeastern Pennsylvania.

To report severe weather, contact your nearest law enforcement
agency. They will relay your report to the National Weather Service
Mount Holly NJ.

LAT...LON 3985 7505 4001 7538 4017 7527 4006 7498
      4005 7497 4006 7496 4003 7489
TIME...MOT...LOC 0250Z 298DEG 16KT 4000 7511 

$$

MPS

Area Forecast Discussion
National Weather Service Mount Holly NJ
958 PM EDT Thu Jun 11 2026

.WHAT HAS CHANGED...
Severe Thunderstorm Watch 317 was canceled for Berks, Lehigh,
Northampton, Carbon, and Monroe Counties, and remains in effect
elsewhere until midnight tonight.

The severe weather threat has trended a bit later for today.
There is also the potential for severe weather on Sunday.

Updated the key message for tidal flooding and updated the rip
current forecast for Friday and Saturday.

&&

.KEY MESSAGES...
1. There is a risk of severe thunderstorms today and Friday.

2. Dangerous heat (potentially record heat) and humidity for
much of the region through Friday, then much less humid over the
weekend.

3. Chances for showers and storms will return as a cold front
passes through late Sunday into Sunday night, then turning more
seasonable through the middle of next week.

4. Widespread minor coastal flooding will develop with the
evening high tide cycles Saturday and Sunday along the Atlantic
coast, Delaware Bay, and on the tidal Delaware River and its
tributaries.

&&

.DISCUSSION...
KEY MESSAGE 1...There is a risk of severe thunderstorms today
and Friday.

Severe Thunderstorm Watch 317 was canceled for Berks, Lehigh,
Northampton, Carbon, and Monroe Counties, and remains in effect
elsewhere until midnight tonight.

The pattern in place will continue to support some additional
showers and thunderstorms across the region today and Friday,
mainly during each late afternoon to evening period. Better
synoptic forcing will arrive Friday with a cold front.

For today's severe weather threat, the larger scale forcing and
shear are expected to remain relatively weak. A shortwave
moving out of the lower Great Lakes region will help trigger
shower and thunderstorm development. One change through the day
with recent guidance has been a later arrival of the convection.
The general timing for severe weather for our area is mainly 6
PM to midnight tonight from west to east. In terms of the
atmospheric environment, shear values are weak, but there is
plenty of instability with the hot and humid conditions that are
present. These conditions will also allow for supportive lapse
rates. This afternoon, convection is already blossoming across
western portions of PA with this scattered activity expected to
congeal into a broken line that arrives through the evening
hours.

A SLIGHT risk (level 2 out of 5) for a severe thunderstorm
potential remains in place for today. Damaging winds will be the
main threat as storms may cluster or evolve into one or more
broken lines with some bowing, however large hail cannot be
ruled out given the magnitude of the instability that is
forecast.

Tomorrow, the region is expected to begin feeling the influence
of the upper-level trough to the west of the region, in
addition to a cold front that will be arriving from the west.
Some showers and thunderstorms should focus near and ahead of
this front, and with strong destabilization and slightly better
wind fields aloft, a severe threat will once again be present.
The convective coverage could be once again enhanced by a
convectively induced shortwave from near the Great Lakes or
upper Ohio Valley. This evolution is less certain, however our
entire area is highlighted in a SLIGHT risk (level 2 out of 5)
for severe thunderstorms. Damaging winds will once again be the
main threat as storms may tend to cluster or evolve into one or
more short lines with some bowing.

KEY MESSAGE 2...Dangerous heat (potentially record heat) and
humidity for much of the region through Friday, then much less
humid over the weekend.

A mid-level ridge slides across the Mid-Atlantic and Northeast
through Friday. At the surface, high pressure remains centered
off the Southeast U.S. coast which will continue to direct a hot
and humid airmass across our area.

Dangerous heat is expected across much of our region through
Friday, with even some record high temperatures potentially
getting challenged. High temperatures both today and Friday are
forecast to peak into the low to mid 90s across most of the
area, though highs may be slightly warmer Friday compared to
today. Dewpoints will start out in the low to mid 70s, but with
afternoon heating and mixing, these should mix down to the upper
60s and low 70s. This still results in peak heat index values
of 95 to 105 degrees across the majority of the area, outside of
the southern Poconos. This level of heat and humidity can
become dangerous quickly for sensitive individuals and those
outdoors for extended periods of time. A Heat Advisory remains
in effect through Friday for areas where the heat index criteria
starts at 96F and 100F.

A cold front is forecast to move through the region late
Friday, which will knock the temperatures and especially the
dewpoints down several degrees. Though it will still be hot with
high temperatures in the upper 80s to low 90s over the weekend,
dewpoints will return to much more comfortable levels (into the
50s in some areas Saturday) and this minimizes the risk for
additional heat related advisories.

KEY MESSAGE 3...Chances for showers and storms will return as a
cold front passes through late Sunday into Sunday night, then
turning more seasonable through the middle of next week.

A shortwave trough will push another cold front through the
region late Sunday into Sunday night. This will give us another
round of scattered showers and thunderstorms, however this one
will be different than the activity we're experiencing this
week. There looks to be plenty of synoptic forcing with more
shear present. Also, there will be instability and supportive
lapse rates. Timing variations remain among guidance for the
cold front, but the atmospheric conditions are supportive of
convection during the afternoon and evening hours. Given these
atmospheric conditions, the Storm Prediction Center has
outlooked us for severe weather Sunday, particularly during the
afternoon and evening hours. PWAT values will also recover for
Sunday allowing for some heavy rain with the convective
activity.

The frontal passage will usher in a much more seasonable
airmass that will stick around through at least the middle of
next week. Highs will be in the upper 70s to mid 80s Monday
through Wednesday, with lows in the mid 50s to low 60s.
Dewpoints in the 50s and low 60s will make for much more
pleasant conditions. Can't completely rule out a few showers,
but overall the chances for rain look low during this period.

KEY MESSAGE 4...Widespread minor coastal flooding will develop
with the evening high tide cycles Saturday and Sunday along the
Atlantic coast, Delaware Bay, and on the tidal Delaware River
and its tributaries.

A New Moon this weekend will result in higher than normal
astronomical tides. Astronomical tides will generally be 1/2
foot less than minor coastal flooding thresholds, and tidal
departure s will be around 1 foot or so. This will result in
widespread minor coastal flooding with the evening and nighttime
high tide cycles Saturday and Sunday on the Atlantic coast,
Delaware Bay, and the tidal Delaware River and its tributaries.
The higher of the two will be Sunday night. Tidal flooding is
not currently expected along the eastern shore of Chesapeake
Bay.

&&

.AVIATION /01Z FRIDAY THROUGH TUESDAY/...
The following discussion is for KPHL, KPNE, KTTN, KABE, KRDG,
KILG, KMIV, KACY and surrounding areas.

Tonight...Scattered showers and thunderstorms should end by
04-06Z everywhere, likely resulting in some restrictions, then
VFR. Cannot rule out some patchy fog late. West to southwest
winds 5 kts or less. Moderate confidence.

Friday...Prevailing VFR expected through the period. Brief
restrictions are possible, with scattered showers and
thunderstorms, most likely after 18-21Z. High confidence in
prevailing VFR through the day, moderate confidence in thunder
timing.

Outlook...

Friday night...Sub-VFR possible with a chance for lingering
showers and storms.

Saturday...VFR. No significant weather expected.

Sunday...Restrictions possible with the chance for showers and
storms.

Monday...VFR. No significant weather expected.

Tuesday...Restrictions possible with the chance for showers and
storms.

&&

.MARINE...
No prevailing marine hazards expected through Friday. A
southwest wind at 10 kt with gusts 15-20 kt and seas of 3-4
feet. Showers and thunderstorms may impact the nearshore waters
and Delaware Bay during this evening and again Friday evening,
with brief strong wind gusts possible.

Outlook...

Saturday...No marine hazards anticipated. Winds will generally
remain between 5-15 kt. Seas generally around 2-3 feet. Fair
weather expected.

Sunday...A brief period of marginal Small Craft Advisory
conditions are possible Sunday afternoon and evening with wind
gusts near 25 kt.

Monday and Tuesday...No marine hazards anticipated with winds
5-10 kt and seas 2-3 feet.

Rip Currents...

For Friday, a medium period 8 second swell, offshore winds, and
breaking waves 2 feet or less will result in a LOW risk for
development of rip currents at the Jersey Shore and Delaware
Beaches.

On Saturday, conditions will be relatively similar, though the
dominant period will increase to around 10 to 11 seconds.
However, with winds offshore, and breaking waves again 2 feet or
less, there will not be much energy in the surf zones. This
will result in another day of a LOW risk for the development of
rip currents.

Ocean water temperatures are mostly in the mid to upper 60s.

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

&&

.CLIMATE...
A very hot and humid airmass will overspread our area through
Friday. Some record high and warmest low temperatures could be
challenged Thursday and/or Friday.

Location                   6/11 Record Highs/Year

Mount Pocono                  91/1911
Allentown                     94/1984
Reading                       98/1911
Philadelphia                  95/1986
Trenton                       96/1911
Atlantic City Airport         97/1984
Atlantic City Marina          91/1959
Wilmington                    95/1973
Georgetown                    95/1947 & 1959

Location                   6/12 Record Warmest Low/Year

Mount Pocono                  69/2005
Allentown                     70/1942
Reading                       75/1958
Philadelphia                  75/2015
Trenton                       72/2015 & 2017
Atlantic City Airport         73/1973 & 2015
Atlantic City Marina          79/2016
Wilmington                    73/2015
Georgetown                    73/1947, 1973, 1986, & 2017

Location                   6/12 Record Highs/Year

Mount Pocono                  87/1967
Allentown                     92/1949, 1961, 2015, & 2017
Reading                       95/1984
Philadelphia                  95/1947 & 2015
Trenton                       94/1933
Atlantic City Airport         94/2017
Atlantic City Marina          93/1880 & 1914
Wilmington                    96/1933
Georgetown                    95/2017

&&

.PHI WATCHES/WARNINGS/ADVISORIES...
PA...Heat Advisory until 8 PM EDT Friday for PAZ060>062-070-071-
     101>106.
NJ...Heat Advisory until 8 PM EDT Friday for NJZ001-007>010-012>015-
     017>020-027.
DE...Heat Advisory until 8 PM EDT Friday for DEZ001.
MD...None.
MARINE...None.

&&

DISCUSSION...Guzzo/MJL/MPS/Staarmann
AVIATION...AKL/MJL
MARINE...AKL/Hoeflich

Preliminary Local Storm Report
National Weather Service Mount Holly NJ
844 PM EDT Thu Jun 11 2026

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

0833 PM     Tstm Wnd Dmg     1 WNW Leesport          40.46N 75.98W
06/11/2026                   Berks              PA   Public

            Tree down near Bellemans Church Rd &
            Railroad Rd. Power is out in the area.

&&

DeSilva

Preliminary Local Storm Report
National Weather Service Mount Holly NJ
846 PM EDT Thu Jun 11 2026

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

0823 PM     Tstm Wnd Dmg     2 NNE Penn Twp          40.49N 76.06W
06/11/2026                   Berks              PA   Public

            Tree down blocking roadway. Time estimated.

&&

DeSilva

Preliminary Local Storm Report
National Weather Service Mount Holly NJ
922 PM EDT Thu Jun 11 2026

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

0904 PM     Tstm Wnd Gst     1 WSW Stevensville      38.99N 76.33W
06/11/2026  M60 MPH          Queen Anne's       MD   Mesonet

            Bay Bridge mesonet.

&&

MPS

Preliminary Local Storm Report...Summary
National Weather Service Mount Holly NJ
931 PM EDT Thu Jun 11 2026

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

0805 PM     Tstm Wnd Dmg     2 NW Strausstown        40.52N 76.21W
06/11/2026                   Berks              PA   Public

            Tree Down on Roadway at PA-183 and Four
            Point Rd.

0817 PM     Tstm Wnd Dmg     1 WSW North Heidelberg  40.39N 76.15W
06/11/2026                   Berks              PA   Public

            Tree down on Dundore Rd.

0823 PM     Tstm Wnd Dmg     2 NNE Penn Twp          40.49N 76.06W
06/11/2026                   Berks              PA   Public

            Tree down blocking roadway. Time estimated.

0833 PM     Tstm Wnd Dmg     1 WNW Leesport          40.46N 75.98W
06/11/2026                   Berks              PA   Public

            Tree down near Bellemans Church Rd &
            Railroad Rd. Power is out in the area.

0904 PM     Tstm Wnd Gst     1 WSW Stevensville      38.99N 76.33W
06/11/2026  M60 MPH          Queen Annes       MD   Mesonet

            Bay Bridge mesonet.

&&

DeSilva

Preliminary Local Storm Report
National Weather Service Mount Holly NJ
1001 PM EDT Thu Jun 11 2026

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

0934 PM     Tstm Wnd Dmg     Mendham                 40.78N 74.60W
06/11/2026                   Morris             NJ   Trained Spotter

            Reports of numerous trees and wires down
            across the town of Mendham.

&&

MJL

Preliminary Local Storm Report
National Weather Service Mount Holly NJ
1011 PM EDT Thu Jun 11 2026

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

0859 PM     Tstm Wnd Dmg     2 S Allentown           40.58N 75.47W
06/11/2026                   Lehigh             PA   911 Call Center

            Wires reported down. Time estimated by
            radar.

&&

MJL