Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2026

Severe Thunderstorm Warning 341, NWS Philadelphia/Mount Holly

September 1, 2026Berks County, Pennsylvania

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Sep 1, 2026, 6:09 PM EDT for Berks County, Pennsylvania. It was in force for 51 min. 3 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, 6:09 PM EDT (22:09 UTC)
Expired: Sep 1, 2026, 7:00 PM EDT
In force: 51 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 Philadelphia radar (KDIX), 146 km from the middle of the area, began a volume at 22:13 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, 6:13 PM EDT	TSTM WND DMG	1 W Centre Twp, PA	Tree down on Irish Creek Rd in Mohrsville. Time estimated.
Sep 1, 6:17 PM EDT	TSTM WND DMG	1 Wsw Centre Twp, PA	Tree Down Blocking both lanes on Rake Rd and Bootleg Rd in Centre Twp.
Sep 1, 7:00 PM EDT	TSTM WND DMG	1 N Shillington, PA	Tree down on Museum Rd in Wyomissing. 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, 10.2 hours before the alert went out and 203 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.

645 
WUUS51 KPHI 012209
SVRPHI
PAC011-012300-
/O.NEW.KPHI.SV.W.0341.260901T2209Z-260901T2300Z/

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

The National Weather Service in Mount Holly NJ has issued a

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

* Until 700 PM EDT.

* At 609 PM EDT, a severe thunderstorm was located over Fairview
  Hgts, or 9 miles northwest of Reading, 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...
  Reading, Wyomissing, Sinking Spring, Laureldale, Leesport,
  Shoemakersville, Bernville, Fairview Hgts, Spring Ridge,
  Shillington, West Reading, Mount Penn, Mohnton, Kenhorst, St.
  Lawrence, Centerport, Wyomissing Hills, West Lawn, Reiffton, and
  Whitfield.

This includes the following highways...
 Interstate 78 in Pennsylvania between mile markers 24 and 28.
 Interstate 176 in Pennsylvania between mile markers 8 and 11.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4048 7617 4056 7605 4039 7572 4023 7596
TIME...MOT...LOC 2209Z 314DEG 16KT 4045 7605 

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

$$

DeSilva

1 follow-up statement

898 
WWUS51 KPHI 012243
SVSPHI

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

PAC011-012300-
/O.CON.KPHI.SV.W.0341.000000T0000Z-260901T2300Z/
Berks PA-
643 PM EDT Tue Sep 1 2026

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

At 643 PM EDT, a severe thunderstorm was located over Reading, moving
southeast 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...
Reading, Wyomissing, Sinking Spring, Laureldale, Leesport, Bernville,
Fairview Hgts, Spring Ridge, Shillington, West Reading, Mount Penn,
Mohnton, Kenhorst, St. Lawrence, Centerport, Wyomissing Hills, West
Lawn, Reiffton, Whitfield, and West Wyomissing.

This includes Interstate 176 in Pennsylvania between mile markers 8
and 11.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4045 7612 4050 7602 4038 7574 4023 7596
TIME...MOT...LOC 2243Z 323DEG 15KT 4035 7593 

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, 6:21 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, 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.