Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2026

Severe Thunderstorm Warning 345, NWS Philadelphia/Mount Holly

September 1, 2026Berks County, Chester County, Pennsylvania

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Sep 1, 2026, 6:56 PM EDT for Berks County, Chester County, Pennsylvania. It was in force for 49 min. 5 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, 6:56 PM EDT (22:56 UTC)
Expired: Sep 1, 2026, 7:45 PM EDT
In force: 49 min
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon
Tornado: Possible
Hail: 1.0 in
Wind: 60.0 mph

Counties Berks County, PA, Chester County, PA

The radar

The Philadelphia radar (KDIX), 135 km from the middle of the area, began a volume at 22:58 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, 7:00 PM EDT	TSTM WND DMG	1 N Shillington, PA	Tree down on Museum Rd in Wyomissing. Time estimated.
Sep 1, 7:16 PM EDT	TSTM WND DMG	1 S Kenhorst, PA	Tree down on Mountain View Rd. Time estimated.
Sep 1, 7:20 PM EDT	TSTM WND DMG	Robeson Twp, PA	Report of trees and wires down in Robeson Township. Time estimated from radar.
Sep 1, 7:34 PM EDT	TSTM WND DMG	2 Nw Warwick Twp, PA	EM reports tree down on Pine Swamp Rd in Warwick Twp. Time estimated.
Sep 1, 7:45 PM EDT	TSTM WND DMG	2 Wsw West Nantmeal Twp, PA	tree was blown down on Morgantown Road, blocking traffic.

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, 10.9 hours before the alert went out and 191 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.

688 
WUUS51 KPHI 012256
SVRPHI
PAC011-029-012345-
/O.NEW.KPHI.SV.W.0345.260901T2256Z-260901T2345Z/

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

The National Weather Service in Mount Holly NJ has issued a

* Severe Thunderstorm Warning for...
  South central Berks County in eastern Pennsylvania...
  North central Chester County in southeastern Pennsylvania...

* Until 745 PM EDT.

* At 656 PM EDT, a severe thunderstorm was located over Spring Ridge,
  or near Reading, moving south 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, Birdsboro, Sinking Spring, Laureldale,
  Wernersville, Leesport, Honey Brook, Elverson, New Morgan, Spring
  Ridge, Fairview Hgts, Shillington, West Reading, Mount Penn,
  Mohnton, Kenhorst, St. Lawrence, West Lawn, and Lorane.

This includes the following highways...
 Pennsylvania Turnpike between mile markers 296 and 305.
 Interstate 176 in Pennsylvania between mile markers 1 and 11.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Remain alert for a possible tornado! Tornadoes can develop quickly
from severe thunderstorms. If you spot a tornado go at once into the
basement or small central room in a sturdy structure.

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

&&

LAT...LON 4045 7592 4012 7574 4008 7594 4011 7594
      4014 7588 4028 7609 4041 7611
TIME...MOT...LOC 2256Z 344DEG 18KT 4035 7601 

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

$$

DeSilva

2 follow-up statements

159 
WWUS51 KPHI 012315
SVSPHI

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

PAC011-029-012345-
/O.CON.KPHI.SV.W.0345.000000T0000Z-260901T2345Z/
Berks PA-Chester PA-
715 PM EDT Tue Sep 1 2026

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 745 PM EDT
FOR SOUTH CENTRAL BERKS AND NORTH CENTRAL CHESTER COUNTIES...

At 715 PM EDT, a severe thunderstorm was located near Wyomissing, or
near Reading, moving south 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, Birdsboro, Sinking Spring, Honey Brook,
Elverson, New Morgan, Spring Ridge, Shillington, West Reading, Mount
Penn, Mohnton, Kenhorst, St. Lawrence, Wyomissing Hills, West Lawn,
Lorane, Reiffton, Whitfield, and West Wyomissing.

This includes the following highways...
 Pennsylvania Turnpike between mile markers 296 and 305.
 Interstate 176 in Pennsylvania between mile markers 1 and 11.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4035 7606 4038 7588 4012 7575 4008 7594
      4011 7594 4014 7588 4026 7605
TIME...MOT...LOC 2315Z 343DEG 17KT 4027 7598 

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

$$

DeSilva

508 
WWUS51 KPHI 012333
SVSPHI

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

PAC011-029-012345-
/O.CON.KPHI.SV.W.0345.000000T0000Z-260901T2345Z/
Berks PA-Chester PA-
733 PM EDT Tue Sep 1 2026

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 745 PM EDT
FOR SOUTH CENTRAL BERKS AND NORTH CENTRAL CHESTER COUNTIES...

At 733 PM EDT, a severe thunderstorm was located near New Morgan, or
9 miles northeast of New Holland, moving south at 25 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...
Birdsboro, Honey Brook, Elverson, New Morgan, Lorane, and Flying
Hills.

This includes the following highways...
 Pennsylvania Turnpike between mile markers 296 and 305.
 Interstate 176 in Pennsylvania between mile markers 1 and 10.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4026 7605 4030 7584 4012 7575 4008 7594
      4011 7594 4014 7588 4025 7604
TIME...MOT...LOC 2333Z 343DEG 23KT 4018 7595 

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, 6:21 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, 6:58 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.