Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2026
Severe Thunderstorm Warning 210, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Jul 21, 2026, 3:58 PM EDT for New Castle County, Delaware; Chester County, Delaware County, Pennsylvania. It was in force for 47 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 21, 2026, 3:58 PM EDT (19:58 UTC)
- Expired
- Jul 21, 2026, 4:45 PM EDT
- In force
- 47 min
- Issued by
- NWS Philadelphia/Mount Holly
- Area
- Storm-based polygon
- Hail
- 0.75 in
- Wind
- 60.0 mph
Counties New Castle County, DE, Chester County, PA, Delaware County, PA
The radar
The Dover AFB radar (KDOX), 116 km from the middle of the area, began a volume at 19:57 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 21, 4:02 PM EDT | TSTM WND DMG | East Bradford Twp, PA | Downed tree on US 322 both directions between NORTH CREEK RD and COPELAND SCHOOL RD. There is a lane restriction. Time estimated from radar. |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
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, 8.0 hours before the alert went out and 155 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.
393
WUUS51 KPHI 211958
SVRPHI
DEC003-PAC029-045-212045-
/O.NEW.KPHI.SV.W.0210.260721T1958Z-260721T2045Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Mount Holly NJ
358 PM EDT Tue Jul 21 2026
The National Weather Service in Mount Holly NJ has issued a
* Severe Thunderstorm Warning for...
Northwestern New Castle County in northern Delaware...
Southwestern Chester County in southeastern Pennsylvania...
Western Delaware County in southeastern Pennsylvania...
* Until 445 PM EDT.
* At 358 PM EDT, a severe thunderstorm was located over Wakefield, or
15 miles north of Havre De Grace, moving east at 45 mph.
HAZARD...60 mph wind gusts.
SOURCE...Radar indicated.
IMPACT...Damage to roofs, siding, trees, and power lines is
possible.
* Locations impacted include...
Wilmington, Newark, West Chester, Elsmere, Kennett Square, New
Castle, Oxford, Parkesburg, West Grove, Newport, Glen Roy,
Homeville, Cochranville, Stanton, North Star, Wilmington Manor,
Mount Vernon, Marshallton, Pike Creek, and Ashland.
This includes Interstate 95 in Delaware between mile markers 3 and
13.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
A Tornado Watch remains in effect until 900 PM EDT for northern
Delaware...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.
A Tornado Watch remains in effect until 900 PM EDT for northern
Delaware...and southeastern Pennsylvania.
&&
LAT...LON 3974 7612 3973 7610 3974 7610 3976 7606
3981 7603 3983 7604 3983 7602 3987 7601
3987 7599 3995 7599 3998 7558 3964 7556
3965 7579 3972 7579 3972 7613
TIME...MOT...LOC 1958Z 266DEG 40KT 3977 7616
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...<.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH
$$
AKL1 follow-up statement
455
WWUS51 KPHI 212027
SVSPHI
Severe Weather Statement
National Weather Service Mount Holly NJ
427 PM EDT Tue Jul 21 2026
DEC003-PAC029-045-212045-
/O.CON.KPHI.SV.W.0210.000000T0000Z-260721T2045Z/
New Castle DE-Chester PA-Delaware PA-
427 PM EDT Tue Jul 21 2026
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 445 PM EDT
FOR NORTHWESTERN NEW CASTLE...SOUTHWESTERN CHESTER AND WESTERN
DELAWARE COUNTIES...
At 427 PM EDT, a severe thunderstorm was located over West Grove, or
11 miles north of Newark, moving east at 35 mph.
HAZARD...60 mph wind gusts.
SOURCE...Radar indicated.
IMPACT...Damage to roofs, siding, trees, and power lines is
possible.
Locations impacted include...
Wilmington, Newark, West Chester, Elsmere, Kennett Square, New
Castle, Oxford, Parkesburg, West Grove, Newport, Glen Roy, Homeville,
Cochranville, Stanton, North Star, Wilmington Manor, Mount Vernon,
Marshallton, Pike Creek, and Ashland.
This includes Interstate 95 in Delaware between mile markers 3 and
13.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
A Tornado Watch remains in effect until 900 PM EDT for northern
Delaware...and southeastern Pennsylvania.
For your protection move to an interior room on the lowest floor of a
building.
Torrential rainfall is occurring with this storm, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.
&&
LAT...LON 3974 7612 3973 7610 3974 7610 3976 7606
3981 7603 3983 7604 3983 7602 3987 7601
3987 7599 3995 7599 3998 7558 3964 7556
3965 7579 3972 7579 3972 7613
TIME...MOT...LOC 2027Z 269DEG 31KT 3984 7580
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...<.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH
$$
AKLThe office that day
Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 21, 4:38 PM EDT | Flash Flood Warning | PHI | New Castle | 4 hr |
| Jul 21, 4:43 PM EDT | Severe Thunderstorm Warning | PHI | New Castle | 47 min |
| Jul 21, 5:06 PM EDT | Severe Thunderstorm Warning | PHI | Kent | 39 min |
| Jul 21, 5:30 PM EDT | Severe Thunderstorm Warning | PHI | New Castle | 45 min |
| Jul 21, 5:42 PM EDT | Severe Thunderstorm Warning | PHI | Kent | 48 min |
| Jul 21, 6:00 PM EDT | Severe Thunderstorm Warning | PHI | Kent, New Castle | 45 min |
| Jul 21, 6:53 PM EDT | Flash Flood Warning | PHI | Kent, New Castle | 3 hr |
| 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, 4:23 PM EDT | Severe Thunderstorm Warning | PHI | Chester, Delaware, Montgomery, Philadelphia | 52 min |
| Jul 21, 4:31 PM EDT | Flash Flood Warning | PHI | Chester, Delaware | 96 min |
Nearby
Severe Thunderstorm Warnings in Pennsylvania, 2026Severe Thunderstorm Warnings in Delaware, 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.