Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2026
Severe Thunderstorm Warning 211, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Jul 21, 2026, 4:23 PM EDT for 4 counties in Pennsylvania. It was in force for 52 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 21, 2026, 4:23 PM EDT (20:23 UTC)
- Expired
- Jul 21, 2026, 5:15 PM EDT
- In force
- 52 min
- Issued by
- NWS Philadelphia/Mount Holly
- Area
- Storm-based polygon
- Hail
- 0.75 in
- Wind
- 60.0 mph
Counties Chester County, PA, Delaware County, PA, Montgomery County, PA, Philadelphia County, PA
The radar
The Philadelphia radar (KDIX), 75 km from the middle of the area, began a volume at 20:25 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 |
|---|---|---|---|
| Jul 21, 2:06 PM EDT | Tornado Watch | SPC | 7 hr |
The nearest sounding before it
Washington/Dulle, VA (KIAD), launched 12:00Z, 8.4 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
- 941 J/kg
- Mixed-layer CIN
- -113 J/kg
- Mixed-layer LCL
- 772 m above ground
- 0-6 km bulk shear
- 35 kt
- 0-1 km storm-relative helicity
- 68 m²/s²
- 0-3 km storm-relative helicity
- 112 m²/s²
- Significant tornado parameter
- 0.2
- Supercell composite
- 0.9
The text
As transmitted.
262
WUUS51 KPHI 212023
SVRPHI
PAC029-045-091-101-212115-
/O.NEW.KPHI.SV.W.0211.260721T2023Z-260721T2115Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Mount Holly NJ
423 PM EDT Tue Jul 21 2026
The National Weather Service in Mount Holly NJ has issued a
* Severe Thunderstorm Warning for...
Southeastern Montgomery County in southeastern Pennsylvania...
East central Chester County in southeastern Pennsylvania...
Southwestern Philadelphia County in southeastern Pennsylvania...
Delaware County in southeastern Pennsylvania...
* Until 515 PM EDT.
* At 423 PM EDT, a severe thunderstorm was located over Gradyville,
or 7 miles east of West Chester, moving east at 25 mph.
HAZARD...60 mph wind gusts.
SOURCE...Radar indicated.
IMPACT...Damage to roofs, siding, trees, and power lines is
possible.
* Locations impacted include...
Philadelphia, Yeadon, Folcroft, Swarthmore, Narberth, National
Park, East Lansdowne, Darby Township, Cheyney, Morris Park,
Germantown, Bryn Mawr, Lima, Trout Lake, South Philadelphia, Radnor
Township, Gradyville, Nether Providence Township, Broomall, and
Newtown Square.
This includes the following highways...
Interstate 95 in Pennsylvania between mile markers 11 and 18.
Interstate 76 in Pennsylvania between mile markers 336 and 350.
Interstate 676 in Pennsylvania between mile markers 0 and 1.
Interstate 476 in Pennsylvania between mile markers 1 and 13.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
A Tornado Watch remains in effect until 900 PM EDT for southern New
Jersey...and southeastern Pennsylvania.
For your protection move to an interior room on the lowest floor of a
building.
A Tornado Watch remains in effect until 900 PM EDT for southern New
Jersey...and southeastern Pennsylvania.
&&
LAT...LON 4007 7515 3988 7515 3987 7520 3990 7555
4001 7555
TIME...MOT...LOC 2023Z 266DEG 21KT 3997 7547
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...<.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH
$$
AKL2 follow-up statements
008
WWUS51 KPHI 212045
SVSPHI
Severe Weather Statement
National Weather Service Mount Holly NJ
445 PM EDT Tue Jul 21 2026
PAC029-212054-
/O.CAN.KPHI.SV.W.0211.000000T0000Z-260721T2115Z/
Chester PA-
445 PM EDT Tue Jul 21 2026
...THE SEVERE THUNDERSTORM WARNING FOR EAST CENTRAL CHESTER COUNTY IS
CANCELLED...
The severe thunderstorm which prompted the warning has moved out of
the warned area. Therefore, the warning has been cancelled.
A Tornado Watch remains in effect until 900 PM EDT for southern New
Jersey...and southeastern Pennsylvania.
LAT...LON 3993 7554 3992 7553 3994 7552 3996 7549
3998 7535 4004 7532 4007 7515 3988 7515
3987 7520 3990 7555
TIME...MOT...LOC 2044Z 265DEG 25KT 3998 7523
$$
PAC045-091-101-212115-
/O.CON.KPHI.SV.W.0211.000000T0000Z-260721T2115Z/
Montgomery PA-Philadelphia PA-Delaware PA-
445 PM EDT Tue Jul 21 2026
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 515 PM EDT
FOR SOUTHEASTERN MONTGOMERY...SOUTHWESTERN PHILADELPHIA AND CENTRAL
DELAWARE COUNTIES...
At 444 PM EDT, a severe thunderstorm was located over Roxborough, or
near Philadelphia, moving east at 30 mph.
HAZARD...60 mph wind gusts.
SOURCE...Radar indicated.
IMPACT...Damage to roofs, siding, trees, and power lines is
possible.
Locations impacted include...
Philadelphia, Yeadon, Folcroft, Swarthmore, Narberth, National Park,
East Lansdowne, Darby Township, Cheyney, Morris Park, Germantown,
Bryn Mawr, Lima, South Philadelphia, Gradyville, Nether Providence
Township, Broomall, Roxborough, Philadelphia International Airport,
and Drexel Hill.
This includes the following highways...
Interstate 95 in Pennsylvania between mile markers 11 and 18.
Interstate 76 in Pennsylvania between mile markers 336 and 350.
Interstate 676 in Pennsylvania between mile markers 0 and 1.
Interstate 476 in Pennsylvania between mile markers 1 and 9.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
A Tornado Watch remains in effect until 900 PM EDT for southern New
Jersey...and southeastern Pennsylvania.
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 3993 7554 3992 7553 3994 7552 3996 7549
3998 7535 4004 7532 4007 7515 3988 7515
3987 7520 3990 7555
TIME...MOT...LOC 2044Z 265DEG 25KT 3998 7523
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...<.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH
$$
Staarmann960
WWUS51 KPHI 212105
SVSPHI
Severe Weather Statement
National Weather Service Mount Holly NJ
505 PM EDT Tue Jul 21 2026
PAC045-091-101-212115-
/O.EXP.KPHI.SV.W.0211.000000T0000Z-260721T2115Z/
Montgomery PA-Philadelphia PA-Delaware PA-
505 PM EDT Tue Jul 21 2026
...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN MONTGOMERY...
SOUTHWESTERN PHILADELPHIA AND CENTRAL DELAWARE COUNTIES WILL EXPIRE
AT 515 PM EDT...
The storm which prompted the warning has weakened below severe
limits, and has exited the warned area. Therefore, the warning will
be allowed to expire. However heavy rain is still possible with this
thunderstorm.
A Tornado Watch remains in effect until 900 PM EDT for southern New
Jersey...and southeastern Pennsylvania.
To report severe weather, contact your nearest law enforcement
agency. They will relay your report to the National Weather Service
Mount Holly NJ.
LAT...LON 3993 7554 3992 7553 3994 7552 3996 7549
3998 7535 4004 7532 4007 7515 3988 7515
3987 7520 3990 7555
TIME...MOT...LOC 2105Z 266DEG 21KT 3999 7508
$$
StaarmannThe office that day
Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 21, 2:18 PM EDT | Severe Thunderstorm Warning | PHI | Berks, Lehigh | 42 min |
| Jul 21, 2:57 PM EDT | Severe Thunderstorm Warning | PHI | Bucks, Lehigh, Northampton | 37 min |
| Jul 21, 3:37 PM EDT | Severe Thunderstorm Warning | PHI | Chester, Delaware | 53 min |
| Jul 21, 3:47 PM EDT | Severe Thunderstorm Warning | PHI | Carbon, Monroe | 43 min |
| Jul 21, 3:58 PM EDT | Severe Thunderstorm Warning | PHI | Chester, Delaware | 47 min |
| Jul 21, 4:31 PM EDT | Flash Flood Warning | PHI | Chester, Delaware | 96 min |
| Jul 21, 4:38 PM EDT | Flash Flood Warning | PHI | Chester, Delaware, Montgomery, Philadelphia | 4 hr |
| Jul 21, 4:43 PM EDT | Severe Thunderstorm Warning | PHI | Chester, Delaware | 47 min |
| Jul 21, 5:30 PM EDT | Severe Thunderstorm Warning | PHI | Delaware | 45 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.