Severe Thunderstorm Warning 171, NWS Philadelphia/Mount Holly

711 
WWUS51 KPHI 112016
SVSPHI

Severe Weather Statement
National Weather Service Mount Holly NJ
416 PM EDT Sat Jul 11 2026

PAC011-112045-
/O.CON.KPHI.SV.W.0171.000000T0000Z-260711T2045Z/
Berks PA-
416 PM EDT Sat Jul 11 2026

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 445 PM EDT
FOR SOUTHWESTERN BERKS COUNTY...

At 416 PM EDT, a severe thunderstorm was located near Womelsdorf, or 
near Myerstown, moving south at 20 mph. At 410 PM EDT, 911 
dispatchers reported trees down on wires north of Womelsdorf.

HAZARD...60 mph wind gusts and quarter size hail.

SOURCE...Law enforcement.

IMPACT...Minor damage to vehicles is possible. Wind damage to roofs, 
         siding, trees, and power lines is possible.

Locations impacted include...
Womelsdorf, Wernersville, Robesonia, and Bernville.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

Frequent cloud to ground lightning is occurring with this storm. Move
indoors immediately. Lightning is one of nature's leading killers.
Remember, if you can hear thunder, you are close enough to be struck
by lightning.

Torrential rainfall is occurring with this storm, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.

&&

LAT...LON 4049 7613 4026 7601 4025 7606 4036 7621
      4037 7623 4042 7632 4047 7628
TIME...MOT...LOC 2016Z 352DEG 17KT 4041 7620 

HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.00 IN
WIND THREAT...OBSERVED
MAX WIND GUST...60 MPH

$$

Staarmann

987 
WWUS51 KPHI 112028
SVSPHI

Severe Weather Statement
National Weather Service Mount Holly NJ
428 PM EDT Sat Jul 11 2026

PAC011-112045-
/O.CON.KPHI.SV.W.0171.000000T0000Z-260711T2045Z/
Berks PA-
428 PM EDT Sat Jul 11 2026

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 445 PM EDT
FOR SOUTHWESTERN BERKS COUNTY...

At 427 PM EDT, a severe thunderstorm was located over Womelsdorf, or 
near Myerstown, moving south at 20 mph. At 410 PM EDT, 911 
dispatchers reported trees down on wires north of Womelsdorf.

HAZARD...60 mph wind gusts and quarter size hail.

SOURCE...Law enforcement.

IMPACT...Minor damage to vehicles is possible. Wind damage to roofs, 
         siding, trees, and power lines is possible.

Locations impacted include...
Womelsdorf, Wernersville, Robesonia, and Bernville.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

Frequent cloud to ground lightning is occurring with this storm. Move
indoors immediately. Lightning is one of nature's leading killers.
Remember, if you can hear thunder, you are close enough to be struck
by lightning.

Torrential rainfall is occurring with this storm, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.

&&

LAT...LON 4044 7611 4026 7601 4025 7606 4036 7621
      4037 7623 4041 7630 4044 7621
TIME...MOT...LOC 2027Z 351DEG 17KT 4036 7619 

HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.00 IN
WIND THREAT...OBSERVED
MAX WIND GUST...60 MPH

$$

Staarmann

776 
WWUS51 KPHI 112047
SVSPHI

Severe Weather Statement
National Weather Service Mount Holly NJ
447 PM EDT Sat Jul 11 2026

PAC011-112056-
/O.EXP.KPHI.SV.W.0171.000000T0000Z-260711T2045Z/
Berks PA-
447 PM EDT Sat Jul 11 2026

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHWESTERN BERKS COUNTY HAS
EXPIRED...

The storm which prompted the warning has moved out of the area.
Therefore, the warning has been allowed to expire.

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 4044 7611 4026 7601 4025 7606 4036 7621
      4037 7623 4041 7630 4044 7621
TIME...MOT...LOC 2046Z 351DEG 17KT 4028 7617 

$$

Staarmann

Area Forecast Discussion
National Weather Service Mount Holly NJ
254 PM EDT Sat Jul 11 2026

.WHAT HAS CHANGED...
Precipitation chances have increased for this afternoon and
evening. The threat for severe weather and flash flooding
remains the same though with a Marginal Risk in place for both.

Updated Key Message 2 and the Outlook sections for Aviation and
Marine.

&&

.KEY MESSAGES...
1. Another round of showers and thunderstorms develops this
afternoon and continues into the early evening.

2. Drier conditions for Sunday and into the upcoming week.
Above normal temperatures are expected for Tuesday and especially
Wednesday.

3. Minor tidal flooding expected this weekend for coastal communities
and areas around Delaware Bay. A Coastal Flood Advisory was issued
for this evening's high tide for the South Jersey coast, Delaware
coast, and areas surrounding Delaware Bay.

&&

.DISCUSSION...
KEY MESSAGE 1...Another round of showers and thunderstorms
develops this afternoon and continues into the early evening.

A cold front is currently moving southward through our area and
will become nearly stationary over or just south of Delmarva
later this afternoon. An area of low pressure will ride along
the boundary, resulting in widespread showers and scattered
thunderstorms continuing through the PM hours.

No changes to both the Excessive Rainfall and Severe Weather
Outlook for today. A Marginal Risk for Excessive Rainfall is in
place from I-80 on south with a Marginal Risk for Severe Weather
from about I-78 southward. More instability will develop out
ahead of the front due to daytime heating, focusing the severe
weather threat on the southern areas. Shear is weak though still
so a Marginal is about right. Some soundings show an inverted
signature as well. This will result in the primary threat for
today being damaging wind gusts for the southern half of the
area. The timing for the strong to severe thunderstorms remains
through about 8 PM, but showers could linger into the first
half of the night.

In terms of the hydro threat, still seeing PWATs towards the
higher climatological percentiles indicating a muggy and moist
airmass. Periods of heavy rain are certainly possible but
thinking rainfall rates will not be as impressive as a few days
ago when we saw several instances of flash flooding. Storms
should also be moving just quickly enough and there isn't much
of a signal for training or backbuilding storms. The Marginal
Risk for Excessive Rainfall remains in place, and thinking
flooding should be limited to urban areas or areas that have
seen significant rainfall over the past 7 days. Otherwise, we
should continue to make inroads on the continuing rainfall
deficit and drought.

The front should finally drop south of the region by tonight,
with high pressure and drier air working in. Cannot rule out
some patchy fog tonight especially over areas that see some
rainfall today, though the incoming dry air should limit the fog
threat a bit.

KEY MESSAGE 2... Drier conditions for Sunday and into the upcoming
week. Above normal temperatures are expected for Tuesday and
especially Wednesday.

Beyond Saturday, things turn drier with an expansive area of high
pressure moving in. Some short range guidance wanted to develop
showers over the higher terrain in the Poconos on Sunday afternoon,
but thinking anything will be very isolated and non- impactful.
Otherwise, it will be dry across the area through mid-week.

Seasonable temperatures and a pleasant stretch are expected from
Sunday through Monday. The heat returns for the middle of next
week as ridging moves into the Mid-Atlantic. Wednesday looks to
be the warmest day with temperatures potentially getting well
into the 90s and heat indices flirting with Heat Advisory criteria.
The above normal temperatures look to continue through the end
of the week, though a cold front may lower temperatures a smidge
at some point.

KEY MESSAGE 3...Minor tidal flooding expected this weekend for
coastal communities and areas around Delaware Bay. A Coastal
Flood Advisory was issued for this evening's high tide for the
South Jersey coast, Delaware coast, and areas surrounding
Delaware Bay.

A light onshore flow sets up for this weekend, resulting in a
minor push of water towards the coastline. Astronomical tides
also begin to increase with the upcoming New Moon on Tuesday.
This will result in elevated tides with minor tidal flooding
possible beginning with the high tide this evening. Guidance
hints at tidal flooding continuing with the evening/nighttime
high tide cycles into early next week before flow turns more
southerly. However, there will be a stronger influence of
astronomical tides as we get towards the New Moon which could
keep elevated tides through the middle of next week. The areas
most at risk of seeing minor tidal flooding are along the
Atlantic Ocean coastline and within Delaware Bay. The severity
looks to remain within minor levels but will monitor how things
trend over the coming days.

For tonight, tides look to be highest along the South Jersey
coast, Delaware coast, and within Delaware Bay. Issued a Coastal
Flood Advisory for these areas, with spotty minor tidal
flooding expected for the northern NJ coast. Those areas may
need an Advisory for Sunday Night's high tide, but too early to
know for certain.

Cannot rule out some spotty minor tidal for communities along
the Delaware River with the upcoming elevated tides. No tidal
flooding is expected in our Eastern Shore zones along the
Chesapeake Bay.

&&

.AVIATION /18Z SATURDAY THROUGH THURSDAY/...
The following discussion is for KPHL, KPNE, KTTN, KABE, KRDG,
KILG, KMIV, KACY and surrounding areas.

Today...Prevailing VFR but showers and thunderstorms are
around this afternoon as a slow moving boundary sags southward.
Maintained TSRA and TEMPO TSRA groups at all terminals, though
coverage of storms should be higher from KPHL on south. Storms
should clear the area by 23z as the front pushes through.
Northeast winds around 5 to 10 kts though locally higher gusts
are possible in thunderstorms. Moderate confidence overall.

Tonight...Primarily VFR. Cannot rule out some patchy fog late,
especially where areas today see rainfall. However, some drier
air should be moving in, which will be a limiting factor in fog
development. Northeast winds around 5 to 8 kt. Moderate
confidence.

Sunday...VFR. East winds 5 to 10 kt. High confidence.

Outlook...

Sunday Night through Thursday...VFR. No significant weather.

&&

.MARINE...
Sub-SCA conditions expected through Sunday. East/northeast winds
around 10-15 kt and seas 2 to 4 feet.

Some showers and thunderstorms this afternoon and evening which
could result in frequent lightning and a brief increase in
winds as well as visibility restrictions.

Outlook...

Sunday Night through Wednesday...No marine headlines expected.
Fair weather.

Rip Currents...

Rest of today, flow turns more onshore, but winds will be light
around 10 MPH or less. Multiple weak swell groups around, but
with relatively calm surf (1 to 3 foot breakers). Rip current
risk remains LOW at all shore points.

For Sunday, onshore flow strengthens a bit with northeast winds
around 15 MPH. However, breaking wave heights remain low (1 to 3
feet) and the dominant wave period should only be around 6
seconds. This will result in a LOW risk for rip currents at all
beaches.

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

&&

.PHI WATCHES/WARNINGS/ADVISORIES...
PA...None.
NJ...Coastal Flood Advisory until 11 PM EDT this evening for
     NJZ021>025.
DE...Coastal Flood Advisory until 11 PM EDT this evening for
     DEZ002>004.
MD...None.
MARINE...None.

&&

DISCUSSION...AKL/Hoeflich/OHara
AVIATION...AKL/OHara
MARINE...AKL/OHara

Hazardous Weather Outlook
National Weather Service Mount Holly NJ
505 AM EDT Sat Jul 11 2026

MDZ012-015-019-020-120915-
Kent MD-Queen Annes-Talbot-Caroline-
505 AM EDT Sat Jul 11 2026

This Hazardous Weather Outlook is for northeast Maryland.

.DAY ONE...Today and tonight.

The probability for widespread hazardous weather is low.

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

The probability for widespread hazardous weather is low.

.SPOTTER INFORMATION STATEMENT...

Spotter activation is not expected at this time.

Hoeflich

Preliminary Local Storm Report
National Weather Service Mount Holly NJ
324 PM EDT Sat Jul 11 2026

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

0243 PM     Tstm Wnd Gst     Ardmore                 40.01N 75.29W
07/11/2026  M55 MPH          Montgomery         PA   Trained Spotter

            Trained spotter measured wind gust in
            Ardmore. Minor flooding of streets also
            reported.

&&

Staarmann

Preliminary Local Storm Report
National Weather Service Mount Holly NJ
339 PM EDT Sat Jul 11 2026

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

0300 PM     Flash Flood      1 E Bryn Mawr           40.03N 75.30W
07/11/2026                   Montgomery         PA   Fire Dept/Rescue

            Water rescue reported at Old Gulph Road and
            Morris Avenue.

&&

Staarmann

Preliminary Local Storm Report
National Weather Service Mount Holly NJ
340 PM EDT Sat Jul 11 2026

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

0302 PM     Flash Flood      1 NNE Ardmore           40.02N 75.29W
07/11/2026                   Montgomery         PA   Fire Dept/Rescue

            Water rescue reported on Grays Lane near
            Mille Creek Road.

&&

Staarmann

Preliminary Local Storm Report
National Weather Service Mount Holly NJ
341 PM EDT Sat Jul 11 2026

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

0303 PM     Flash Flood      1 SSE Bala Cynwyd       40.00N 75.24W
07/11/2026                   Montgomery         PA   Fire Dept/Rescue

            Water rescue reported at City Avenue and Old
            Lancaster Road.

&&

Staarmann

Preliminary Local Storm Report
National Weather Service Mount Holly NJ
349 PM EDT Sat Jul 11 2026

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

0259 PM     Tstm Wnd Dmg     1 SSE Point Breeze      39.92N 75.18W
07/11/2026                   Philadelphia       PA   Emergency Mngr

            Report of 4 trees down on the 2500 block of
            South Colorado Street in South Philly. Time
            estimated from radar.

&&

Staarmann

Preliminary Local Storm Report
National Weather Service Mount Holly NJ
354 PM EDT Sat Jul 11 2026

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

0319 PM     Flash Flood      1 W Haverford           40.01N 75.32W
07/11/2026                   Delaware           PA   Public

            Public report of flooding along the
            Norristown SEPTA line west of the Haverford
            station. Train service has stopped due to
            flooding on the tracks.

&&

Staarmann