Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2026
Severe Thunderstorm Warning 348, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Sep 1, 2026, 7:13 PM EDT for 4 counties in Pennsylvania. It was in force for 47 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, 7:13 PM EDT (23:13 UTC)
- Expired
- Sep 1, 2026, 8:00 PM EDT
- In force
- 47 min
- Issued by
- NWS Philadelphia/Mount Holly
- Area
- Storm-based polygon
- Hail
- 1.0 in
- Wind
- 60.0 mph
Counties Berks County, PA, Chester County, PA, Lehigh County, PA, Montgomery County, PA
The radar
The Philadelphia radar (KDIX), 118 km from the middle of the area, began a volume at 23:16 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, 11.2 hours before the alert went out and 225 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
- 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
The text
As transmitted.
897
WUUS51 KPHI 012313
SVRPHI
PAC011-029-077-091-020000-
/O.NEW.KPHI.SV.W.0348.260901T2313Z-260902T0000Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Mount Holly NJ
713 PM EDT Tue Sep 1 2026
The National Weather Service in Mount Holly NJ has issued a
* Severe Thunderstorm Warning for...
Eastern Berks County in eastern Pennsylvania...
Northwestern Montgomery County in southeastern Pennsylvania...
Central Lehigh County in eastern Pennsylvania...
Northeastern Chester County in southeastern Pennsylvania...
* Until 800 PM EDT.
* At 713 PM EDT, a severe thunderstorm was located near Topton, or 12
miles west of Allentown, 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...
Pottstown, Collegeville, Kutztown, Royersford, Fleetwood, Trappe,
East Greenville, Topton, Schwenksville, Bally, Bechtelsville, Green
Lane, Lyons, Pughtown, Ancient Oaks, Spring Mount, Claussville,
Gilbertsville, Cedarville, and Skippack.
This includes Interstate 78 in Pennsylvania between mile markers 38
and 53.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 4066 7561 4020 7536 4012 7574 4060 7587
TIME...MOT...LOC 2313Z 345DEG 24KT 4055 7570
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.00 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH
$$
DeSilva2 follow-up statements
618
WWUS51 KPHI 012338
SVSPHI
Severe Weather Statement
National Weather Service Mount Holly NJ
738 PM EDT Tue Sep 1 2026
PAC011-029-077-091-020000-
/O.CON.KPHI.SV.W.0348.000000T0000Z-260902T0000Z/
Berks PA-Montgomery PA-Lehigh PA-Chester PA-
738 PM EDT Tue Sep 1 2026
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 800 PM EDT
FOR EAST CENTRAL BERKS...NORTHWESTERN MONTGOMERY...SOUTH CENTRAL
LEHIGH AND NORTH CENTRAL CHESTER COUNTIES...
At 738 PM EDT, a severe thunderstorm was located over Bally, or 14
miles south of Allentown, moving southeast at 25 mph.
HAZARD...60 mph wind gusts and quarter size hail.
SOURCE...Radar indicated.
IMPACT...Minor damage to vehicles is possible. Wind damage to roofs,
siding, trees, and power lines is possible.
Locations impacted include...
Pottstown, Collegeville, Royersford, Trappe, East Greenville,
Schwenksville, Bally, Bechtelsville, Green Lane, Spring Mount,
Gilbertsville, Skippack, Boyertown, Pennsburg, Spring City, Macungie,
Red Hill, Alburtis, Pottsgrove, and Evansburg.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 4048 7573 4053 7554 4020 7536 4014 7562
TIME...MOT...LOC 2338Z 336DEG 24KT 4040 7557
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.00 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH
$$
DeSilva581 WWUS51 KPHI 012351 SVSPHI Severe Weather Statement National Weather Service Mount Holly NJ 751 PM EDT Tue Sep 1 2026 PAC011-029-077-091-020001- /O.EXP.KPHI.SV.W.0348.000000T0000Z-260902T0000Z/ Berks PA-Montgomery PA-Lehigh PA-Chester PA- 751 PM EDT Tue Sep 1 2026 ...THE SEVERE THUNDERSTORM WARNING FOR EAST CENTRAL BERKS... NORTHWESTERN MONTGOMERY...SOUTH CENTRAL LEHIGH AND NORTH CENTRAL CHESTER COUNTIES WILL EXPIRE AT 800 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. A Severe Thunderstorm Watch remains in effect until midnight EDT for eastern and southeastern Pennsylvania. LAT...LON 4048 7573 4053 7554 4020 7536 4014 7562 TIME...MOT...LOC 2351Z 345DEG 24KT 4033 7555 $$ 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, 6:58 PM EDT | Severe Thunderstorm Warning | PHI | Berks | 34 min |
| Sep 1, 7:43 PM EDT | Severe Thunderstorm Warning | PHI | Berks, Chester, Delaware | 47 min |
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.