Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2026

Severe Thunderstorm Warning 346, NWS Philadelphia/Mount Holly

September 1, 2026Berks County, Pennsylvania

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Sep 1, 2026, 6:58 PM EDT for Berks County, Pennsylvania. It was in force for 34 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued: Sep 1, 2026, 6:58 PM EDT (22:58 UTC)
Expired: Sep 1, 2026, 7:32 PM EDT
In force: 34 min
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

County Berks County, PA

The radar

The State College radar (KCCX), 159 km from the middle of the area, began a volume at 23:02 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 watch it was issued in

The SPC watch in force over the same counties when this warning went out.

Issued	Product	Office	Lasted
Sep 1, 4:32 PM EDT	Severe Thunderstorm Watch	SPC	7 hr

The nearest sounding before it

Washington/Dulle, VA (KIAD), launched 12:00Z, 11.0 hours before the alert went out and 192 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 270 J/kg
Mixed-layer CIN: -74 J/kg
Mixed-layer LCL: 1350 m above ground
0-6 km bulk shear: 32 kt
0-1 km storm-relative helicity: 104 m²/s²
0-3 km storm-relative helicity: 101 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.3

Open this sounding in Storm Lab

The text

As transmitted.

701 
WUUS51 KPHI 012258
SVRPHI
PAC011-012345-
/O.NEW.KPHI.SV.W.0346.260901T2258Z-260901T2345Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Mount Holly NJ
658 PM EDT Tue Sep 1 2026

The National Weather Service in Mount Holly NJ has issued a

* Severe Thunderstorm Warning for...
  Southwestern Berks County in eastern Pennsylvania...

* Until 745 PM EDT.

* At 658 PM EDT, a severe thunderstorm was located near Strausstown,
  or 7 miles northeast of Myerstown, moving south at 35 mph.

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

  SOURCE...Radar indicated.

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

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

This includes Interstate 78 in Pennsylvania between mile markers 10
and 22.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4052 7634 4052 7625 4055 7615 4023 7602
      4031 7614 4036 7621 4037 7623 4049 7643
TIME...MOT...LOC 2258Z 340DEG 29KT 4048 7625 

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

$$

DeSilva

2 follow-up statements

925 
WWUS51 KPHI 012316
SVSPHI

Severe Weather Statement
National Weather Service Mount Holly NJ
716 PM EDT Tue Sep 1 2026

PAC011-012345-
/O.CON.KPHI.SV.W.0346.000000T0000Z-260901T2345Z/
Berks PA-
716 PM EDT Tue Sep 1 2026

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 745 PM EDT
FOR WEST CENTRAL BERKS COUNTY...

At 716 PM EDT, a severe thunderstorm was located over Richland, or
over Myerstown, moving south at 30 mph.

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

SOURCE...Radar indicated.

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

Locations impacted include...
Womelsdorf.

This includes Interstate 78 in Pennsylvania between mile markers 10
and 17.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4052 7625 4032 7615 4036 7621 4037 7623
      4049 7643 4052 7634
TIME...MOT...LOC 2316Z 340DEG 27KT 4036 7627 

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

$$

DeSilva

888 
WWUS51 KPHI 012332
SVSPHI

Severe Weather Statement
National Weather Service Mount Holly NJ
732 PM EDT Tue Sep 1 2026

PAC011-012342-
/O.CAN.KPHI.SV.W.0346.000000T0000Z-260901T2345Z/
Berks PA-
732 PM EDT Tue Sep 1 2026

...THE SEVERE THUNDERSTORM WARNING FOR WEST CENTRAL BERKS COUNTY IS
CANCELLED...

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 has been cancelled.

A Severe Thunderstorm Watch remains in effect until midnight EDT for
eastern Pennsylvania.

LAT...LON 4052 7625 4032 7615 4036 7621 4037 7623
      4049 7643 4052 7634
TIME...MOT...LOC 2330Z 340DEG 29KT 4024 7621 

$$

DeSilva

The office that day

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

Issued	Product	Office	Counties	Lasted
Sep 1, 2:30 AM EDT	Heat Advisory	PHI	Bucks, Chester, Delaware, Montgomery, Philadelphia	18 hr
Sep 1, 5:45 PM EDT	Severe Thunderstorm Warning	PHI	Monroe, Northampton	45 min
Sep 1, 5:50 PM EDT	Severe Thunderstorm Warning	PHI	Carbon, Lehigh, Northampton	40 min
Sep 1, 6:09 PM EDT	Severe Thunderstorm Warning	PHI	Berks	51 min
Sep 1, 6:21 PM EDT	Severe Thunderstorm Warning	PHI	Berks	39 min
Sep 1, 6:29 PM EDT	Severe Thunderstorm Warning	PHI	Carbon, Lehigh, Northampton	46 min
Sep 1, 6:38 PM EDT	Flash Flood Warning	PHI	Berks	4 hr
Sep 1, 6:56 PM EDT	Severe Thunderstorm Warning	PHI	Berks, Chester	49 min
Sep 1, 7:13 PM EDT	Severe Thunderstorm Warning	PHI	Berks, Chester, Lehigh, Montgomery	47 min
Sep 1, 7:43 PM EDT	Severe Thunderstorm Warning	PHI	Berks, Chester, Delaware	47 min

Nearby

Severe Thunderstorm Warnings in Pennsylvania, 2026 Every severe thunderstorm warning 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.