Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2026
Severe Thunderstorm Warning 335, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Aug 27, 2026, 8:40 PM EDT for Berks County, Pennsylvania. It was in force for 50 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
- Aug 27, 2026, 8:40 PM EDT (00:40 UTC)
- Expired
- Aug 27, 2026, 9:30 PM EDT
- In force
- 50 min
- Issued by
- NWS Philadelphia/Mount Holly
- Area
- Storm-based polygon
- Hail
- 0.75 in
- Wind
- 60.0 mph
County Berks County, PA
The radar
The State College radar (KCCX), 148 km from the middle of the area, began a volume at 00:41 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 |
|---|---|---|---|
| Aug 27, 12:51 PM EDT | Severe Thunderstorm Watch | SPC | 9 hr |
The nearest sounding before it
Washington/Dulle, VA (KIAD), launched 00:00Z, 0.7 hours before the alert went out and 194 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.
- Mixed-layer CAPE
- 1155 J/kg
- Mixed-layer CIN
- -14 J/kg
- Mixed-layer LCL
- 1287 m above ground
- 0-6 km bulk shear
- 37 kt
- 0-1 km storm-relative helicity
- 27 m²/s²
- 0-3 km storm-relative helicity
- 65 m²/s²
- Significant tornado parameter
- 0.3
- Supercell composite
- 2.3
The text
As transmitted.
679
WUUS51 KPHI 280040
SVRPHI
PAC011-280130-
/O.NEW.KPHI.SV.W.0335.260828T0040Z-260828T0130Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Mount Holly NJ
Issued by National Weather Service New York NY
840 PM EDT Thu Aug 27 2026
The National Weather Service in Mount Holly NJ has issued a
* Severe Thunderstorm Warning for...
West central Berks County in eastern Pennsylvania...
* Until 930 PM EDT.
* At 840 PM EDT, a severe thunderstorm was located near
Fredericksburg, or 8 miles northwest of Myerstown, moving east at
10 mph.
HAZARD...60 mph wind gusts and penny size hail.
SOURCE...Radar indicated.
IMPACT...Expect damage to trees and power lines.
* This severe thunderstorm will remain over mainly rural areas of
west central Berks County.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
Torrential rainfall is occurring with this storm, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.
&&
LAT...LON 4049 7642 4051 7637 4051 7635 4052 7634
4052 7626 4053 7622 4037 7623 4049 7644
TIME...MOT...LOC 0040Z 260DEG 9KT 4048 7639
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...0.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH
$$2 follow-up statements
631
WWUS51 KPHI 280101
SVSPHI
Severe Weather Statement
National Weather Service Mount Holly NJ
Issued by National Weather Service New York NY
901 PM EDT Thu Aug 27 2026
PAC011-280130-
/O.CON.KPHI.SV.W.0335.000000T0000Z-260828T0130Z/
Berks PA-
901 PM EDT Thu Aug 27 2026
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 930 PM EDT
FOR WEST CENTRAL BERKS COUNTY...
At 900 PM EDT, a severe thunderstorm was located near Pine Grove, or
7 miles north of Myerstown, moving east at 10 mph.
HAZARD...60 mph wind gusts and penny size hail.
SOURCE...Radar indicated.
IMPACT...Expect damage to trees and power lines.
This severe thunderstorm will remain over mainly rural areas of west
central Berks County.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
Torrential rainfall is occurring with this storm, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.
&&
LAT...LON 4049 7642 4051 7637 4051 7635 4052 7634
4052 7626 4053 7622 4037 7623 4049 7644
TIME...MOT...LOC 0100Z 260DEG 9KT 4049 7632
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...0.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH
$$716
WWUS51 KPHI 280120
SVSPHI
Severe Weather Statement
National Weather Service Mount Holly NJ
Issued by National Weather Service New York NY
920 PM EDT Thu Aug 27 2026
PAC011-280130-
/O.EXP.KPHI.SV.W.0335.000000T0000Z-260828T0130Z/
Berks PA-
920 PM EDT Thu Aug 27 2026
...THE SEVERE THUNDERSTORM WARNING FOR WEST CENTRAL BERKS COUNTY WILL
EXPIRE AT 930 PM EDT...
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 will be allowed to expire. However heavy rain
is still possible with this thunderstorm.
A Severe Thunderstorm Watch remains in effect until 1000 PM EDT for
eastern Pennsylvania.
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 4049 7642 4051 7637 4051 7635 4052 7634
4052 7626 4053 7622 4037 7623 4049 7644
TIME...MOT...LOC 0120Z 260DEG 9KT 4050 7627
$$The office that day
Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 27, 8:09 PM EDT | Areal Flood Warning | PHI | Bucks, Montgomery | 5 hr |
| Aug 27, 8:16 PM EDT | Flash Flood Warning | PHI | Berks | 4 hr |
| Aug 27, 9:09 PM EDT | Areal Flood Warning | PHI | Bucks, Chester, Montgomery | 4 hr |
| Aug 27, 9:21 PM EDT | Flash Flood Warning | PHI | Berks | 3 hr |
| Aug 27, 9:32 PM EDT | River Flood Warning | PHI | Bucks | 6 hr |
| Aug 27, 10:22 PM EDT | Severe Thunderstorm Warning | PHI | Berks, Chester | 38 min |
| Aug 27, 10:36 PM EDT | Flash Flood Warning | PHI | Berks, Chester, Montgomery | 3 hr |
Nearby
Severe Thunderstorm Warnings in Pennsylvania, 2026Every 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.