Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2026
Severe Thunderstorm Warning 229, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Jul 27, 2026, 3:01 PM EDT for Chester County, Montgomery County, Pennsylvania. It was in force for 44 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
- Jul 27, 2026, 3:01 PM EDT (19:01 UTC)
- Expired
- Jul 27, 2026, 3:45 PM EDT
- In force
- 44 min
- Issued by
- NWS Philadelphia/Mount Holly
- Area
- Storm-based polygon
- Hail
- 0.75 in
- Wind
- 60.0 mph
Counties Chester County, PA, Montgomery County, PA
The radar
The Philadelphia radar (KDIX), 95 km from the middle of the area, began a volume at 19:02 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 nearest sounding before it
Washington/Dulle, VA (KIAD), launched 12:00Z, 7.0 hours before the alert went out and 213 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
- 87 J/kg
- Mixed-layer CIN
- -53 J/kg
- Mixed-layer LCL
- 1233 m above ground
- 0-6 km bulk shear
- 24 kt
- 0-1 km storm-relative helicity
- 5 m²/s²
- 0-3 km storm-relative helicity
- 45 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
612
WUUS51 KPHI 271901
SVRPHI
PAC029-091-271945-
/O.NEW.KPHI.SV.W.0229.260727T1901Z-260727T1945Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Mount Holly NJ
301 PM EDT Mon Jul 27 2026
The National Weather Service in Mount Holly NJ has issued a
* Severe Thunderstorm Warning for...
Southwestern Montgomery County in southeastern Pennsylvania...
Northeastern Chester County in southeastern Pennsylvania...
* Until 345 PM EDT.
* At 301 PM EDT, a severe thunderstorm was located over Collegeville,
or 17 miles northeast of West Chester, moving southeast at 10 mph.
HAZARD...60 mph wind gusts.
SOURCE...Radar indicated.
IMPACT...Damage to roofs, siding, trees, and power lines is
possible.
* Locations impacted include...
Norristown, Phoenixville, West Norriton, East Norriton,
Collegeville, Royersford, Trappe, Schwenksville, Valley Forge,
Paoli, King Of Prussia, Skippack, Spring City, Malvern, Evansburg,
Audubon, Chesterbrook, Eagleville, Trooper, and Blue Bell.
This includes the following highways...
Pennsylvania Turnpike between mile markers 320 and 327.
Northeast Extension near mile marker 23.
Interstate 76 in Pennsylvania near mile marker 327.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 4021 7559 4027 7549 4015 7528 4002 7551
TIME...MOT...LOC 1901Z 316DEG 10KT 4018 7547
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...<.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH
$$
Guzzo2 follow-up statements
347
WWUS51 KPHI 271920
SVSPHI
Severe Weather Statement
National Weather Service Mount Holly NJ
320 PM EDT Mon Jul 27 2026
PAC029-091-271945-
/O.CON.KPHI.SV.W.0229.000000T0000Z-260727T1945Z/
Montgomery PA-Chester PA-
320 PM EDT Mon Jul 27 2026
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 345 PM EDT
FOR CENTRAL MONTGOMERY AND NORTHEASTERN CHESTER COUNTIES...
At 319 PM EDT, a severe thunderstorm was located over West Norriton,
or 15 miles northeast of West Chester, moving southeast at 20 mph.
HAZARD...60 mph wind gusts.
SOURCE...Radar indicated.
IMPACT...Damage to roofs, siding, trees, and power lines is
possible.
Locations impacted include...
Norristown, Phoenixville, West Norriton, East Norriton, Collegeville,
Royersford, Trappe, Schwenksville, Valley Forge, Paoli, King Of
Prussia, Skippack, Spring City, Malvern, Evansburg, Audubon,
Chesterbrook, Eagleville, Trooper, and Blue Bell.
This includes the following highways...
Pennsylvania Turnpike between mile markers 320 and 327.
Northeast Extension near mile marker 23.
Interstate 76 in Pennsylvania near mile marker 327.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 4020 7558 4026 7548 4015 7528 4002 7551
TIME...MOT...LOC 1919Z 318DEG 17KT 4014 7542
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...<.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH
$$
Guzzo312 WWUS51 KPHI 271936 SVSPHI Severe Weather Statement National Weather Service Mount Holly NJ 336 PM EDT Mon Jul 27 2026 PAC029-091-271945- /O.EXP.KPHI.SV.W.0229.000000T0000Z-260727T1945Z/ Montgomery PA-Chester PA- 336 PM EDT Mon Jul 27 2026 ...THE SEVERE THUNDERSTORM WARNING FOR CENTRAL MONTGOMERY AND NORTHEASTERN CHESTER COUNTIES WILL EXPIRE AT 345 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. LAT...LON 4020 7558 4026 7548 4015 7528 4002 7551 TIME...MOT...LOC 1935Z 316DEG 10KT 4011 7538 $$ Guzzo
The office that day
Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 27, 2:15 PM EDT | Flood Watch | PHI | Berks, Bucks, Carbon, Chester, Delaware, Lehigh and 4 more | 38 hr |
| Jul 27, 2:57 PM EDT | Severe Thunderstorm Warning | PHI | Bucks, Montgomery, Philadelphia | 48 min |
| Jul 27, 3:41 PM EDT | Severe Thunderstorm Warning | PHI | Montgomery, Philadelphia | 49 min |
| Jul 27, 3:50 PM EDT | Severe Thunderstorm Warning | PHI | Monroe, Northampton | 40 min |
| Jul 27, 3:58 PM EDT | Flash Flood Warning | PHI | Delaware, Montgomery, Philadelphia | 3 hr |
| Jul 27, 5:25 PM EDT | Flash Flood Warning | PHI | Lehigh | 2 hr |
| Jul 27, 5:51 PM EDT | Severe Thunderstorm Warning | PHI | Berks, Lehigh | 23 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.