Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2026
Severe Thunderstorm Warning 231, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Jul 27, 2026, 3:41 PM EDT for Montgomery County, Philadelphia County, Pennsylvania. It was in force for 49 min. 1 report 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
- Jul 27, 2026, 3:41 PM EDT (19:41 UTC)
- Expired
- Jul 27, 2026, 4:30 PM EDT
- In force
- 49 min
- Issued by
- NWS Philadelphia/Mount Holly
- Area
- Storm-based polygon
- Hail
- 0.75 in
- Wind
- 60.0 mph
Counties Montgomery County, PA, Philadelphia County, PA
The radar
The Philadelphia radar (KDIX), 74 km from the middle of the area, began a volume at 19:41 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.
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| Jul 27, 3:48 PM EDT | HAIL 0.5 | Chestnut Hill, PA | 0.25 to 0.50 inch hail reported in Chestnut Hill. Winds estimated around 40 mph. |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
The nearest sounding before it
Brookhaven, NY (KOKX), launched 12:00Z, 7.7 hours before the alert went out and 219 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
- 199 J/kg
- Mixed-layer CIN
- -62 J/kg
- Mixed-layer LCL
- 928 m above ground
- 0-6 km bulk shear
- 15 kt
- 0-1 km storm-relative helicity
- 27 m²/s²
- 0-3 km storm-relative helicity
- 74 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
401
WUUS51 KPHI 271941
SVRPHI
PAC091-101-272030-
/O.NEW.KPHI.SV.W.0231.260727T1941Z-260727T2030Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Mount Holly NJ
341 PM EDT Mon Jul 27 2026
The National Weather Service in Mount Holly NJ has issued a
* Severe Thunderstorm Warning for...
Southeastern Montgomery County in southeastern Pennsylvania...
Northwestern Philadelphia County in southeastern Pennsylvania...
* Until 430 PM EDT.
* At 341 PM EDT, a severe thunderstorm was located over Plymouth
Meeting, or 8 miles northwest of Philadelphia, moving northeast 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...
Philadelphia, East Norriton, Conshohocken, Ambler, Jenkintown,
Narberth, Rockledge, Morris Park, Plymouth Meeting, Germantown,
Bryn Mawr, Chestnut Hill, West Conshohocken, Penn Wynne, Fort
Washington, Blue Bell, Glenside, Flourtown, Spring House, and
Ardmore.
This includes the following highways...
Pennsylvania Turnpike between mile markers 332 and 340.
Northeast Extension between mile markers 21 and 23.
Interstate 76 in Pennsylvania between mile markers 330 and 339.
Interstate 476 in Pennsylvania between mile markers 15 and 19.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 4022 7525 4009 7508 3997 7527 4005 7535
4007 7535
TIME...MOT...LOC 1941Z 223DEG 8KT 4008 7526
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...<.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH
$$
Guzzo2 follow-up statements
366
WWUS51 KPHI 271956
SVSPHI
Severe Weather Statement
National Weather Service Mount Holly NJ
356 PM EDT Mon Jul 27 2026
PAC091-101-272030-
/O.CON.KPHI.SV.W.0231.000000T0000Z-260727T2030Z/
Montgomery PA-Philadelphia PA-
356 PM EDT Mon Jul 27 2026
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 430 PM EDT
FOR SOUTHEASTERN MONTGOMERY AND NORTHWESTERN PHILADELPHIA COUNTIES...
At 355 PM EDT, a severe thunderstorm was located over Chestnut Hill,
or 7 miles northwest of Philadelphia, moving northeast at 10 mph.
HAZARD...60 mph wind gusts and quarter size hail.
SOURCE...Radar indicated.
IMPACT...Minor damage to vehicles is possible. Wind damage to roofs,
siding, trees, and power lines is possible.
Locations impacted include...
Philadelphia, East Norriton, Conshohocken, Ambler, Jenkintown,
Rockledge, Plymouth Meeting, Germantown, Chestnut Hill, Roxborough,
West Conshohocken, Fort Washington, Blue Bell, Glenside, Flourtown,
Spring House, Oreland, Wyndmoor, Wyncote, and Maple Glen.
This includes the following highways...
Pennsylvania Turnpike between mile markers 332 and 340.
Northeast Extension between mile markers 21 and 23.
Interstate 76 in Pennsylvania between mile markers 330 and 339.
Interstate 476 in Pennsylvania between mile markers 16 and 19.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 4022 7525 4009 7508 4000 7522 4007 7535
TIME...MOT...LOC 1955Z 223DEG 8KT 4009 7522
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.00 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH
$$
Guzzo210 WWUS51 KPHI 272023 SVSPHI Severe Weather Statement National Weather Service Mount Holly NJ 423 PM EDT Mon Jul 27 2026 PAC091-101-272033- /O.EXP.KPHI.SV.W.0231.000000T0000Z-260727T2030Z/ Montgomery PA-Philadelphia PA- 423 PM EDT Mon Jul 27 2026 ...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN MONTGOMERY AND NORTHWESTERN PHILADELPHIA COUNTIES WILL EXPIRE AT 430 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 4022 7525 4009 7508 4000 7522 4007 7535 TIME...MOT...LOC 2023Z 223DEG 8KT 4013 7517 $$ 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, 3:01 PM EDT | Severe Thunderstorm Warning | PHI | Chester, Montgomery | 44 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.