Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2026

Severe Thunderstorm Warning 342, NWS Philadelphia/Mount Holly

September 1, 2026Berks County, Pennsylvania

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Sep 1, 2026, 6:21 PM EDT for Berks County, Pennsylvania. It was in force for 39 min. 4 reports came from inside the area while it was in force.

The area

The outline as issued, with what was reported inside it.

The facts

Issued: Sep 1, 2026, 6:21 PM EDT (22:21 UTC)
Expired: Sep 1, 2026, 7:00 PM EDT
In force: 39 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), 157 km from the middle of the area, began a volume at 22:25 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.

What was reported inside it

Time	Report	Where	Remark
Sep 1, 6:36 PM EDT	TSTM WND DMG	4 W Bethel, PA	Tree down on wires. Time estimated.
Sep 1, 6:36 PM EDT	TSTM WND DMG	5 Wnw Bethel, PA	Wires down on Pine Grove Rd in Bethel. Time estimated.
Sep 1, 6:49 PM EDT	TSTM WND DMG	Mount Aetna, PA	Tree down on Market St in Myerstown. Time estimated.
Sep 1, 6:53 PM EDT	TSTM WND DMG	1 S Marion Twp, PA	Trees down in Womelsdorf. Time estimated.

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

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, 10.4 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.

613 
WUUS51 KPHI 012221
SVRPHI
PAC011-012300-
/O.NEW.KPHI.SV.W.0342.260901T2221Z-260901T2300Z/

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

The National Weather Service in Mount Holly NJ has issued a

* Severe Thunderstorm Warning for...
  West central Berks County in eastern Pennsylvania...

* Until 700 PM EDT.

* At 621 PM EDT, a severe thunderstorm was located near Pine Grove,
  or 8 miles north of Myerstown, moving southeast at 20 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...
  Sinking Spring, Womelsdorf, Wernersville, Robesonia, Bernville, and
  Strausstown.

This includes Interstate 78 in Pennsylvania between mile markers 10
and 21.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4050 7641 4051 7637 4052 7625 4054 7617
      4030 7602 4028 7610 4036 7621 4037 7623
      4049 7643
TIME...MOT...LOC 2221Z 336DEG 17KT 4050 7630 

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

$$

DeSilva

1 follow-up statement

186 
WWUS51 KPHI 012245
SVSPHI

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

PAC011-012300-
/O.CON.KPHI.SV.W.0342.000000T0000Z-260901T2300Z/
Berks PA-
645 PM EDT Tue Sep 1 2026

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 700 PM EDT
FOR WEST CENTRAL BERKS COUNTY...

At 645 PM EDT, a severe thunderstorm was located near Myerstown,
moving south at 15 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, Robesonia, Bernville, and Strausstown.

This includes Interstate 78 in Pennsylvania between mile markers 10
and 21.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4054 7618 4037 7606 4035 7605 4032 7615
      4036 7621 4037 7623 4049 7643 4050 7641
      4051 7637 4052 7625
TIME...MOT...LOC 2245Z 343DEG 15KT 4044 7631 

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

$$

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, 6:29 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, 6:58 PM EDT	Severe Thunderstorm Warning	PHI	Berks	34 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.