Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2026
Severe Thunderstorm Warning 137, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Jul 4, 2026, 8:38 PM EDT for Salem County, New Jersey; Chester County, Delaware County, Pennsylvania; New Castle County, Delaware. It was in force for 52 min. 2 reports 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 4, 2026, 8:38 PM EDT (00:38 UTC)
- Expired
- Jul 4, 2026, 9:30 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 New Castle County, DE, Salem County, NJ, Chester County, PA, Delaware County, PA
The radar
The Dover AFB radar (KDOX), 106 km from the middle of the area, began a volume at 00:38 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 4, 8:38 PM EDT | TSTM WND DMG | 1 Ene Brookside, DE | Multiple reports of trees and wires down between Newark and Christiana. Time estimated from radar. |
| Jul 4, 8:45 PM EDT | MARINE TSTM WIND 44 | 1 Se Rogers Manor, DE | Wilmington ASOS gusted to 38 kt. |
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 4, 3:28 PM EDT | Severe Thunderstorm Watch | SPC | 7 hr |
The nearest sounding before it
Brookhaven, NY (KOKX), launched 00:00Z, 0.6 hours before the alert went out and 276 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
- 1105 J/kg
- Mixed-layer CIN
- -28 J/kg
- Mixed-layer LCL
- 1723 m above ground
- 0-6 km bulk shear
- 29 kt
- 0-1 km storm-relative helicity
- 100 m²/s²
- 0-3 km storm-relative helicity
- 144 m²/s²
- Significant tornado parameter
- 0.1
- Supercell composite
- 3.7
The text
As transmitted.
006
WUUS51 KPHI 050038
SVRPHI
DEC003-NJC033-PAC029-045-050130-
/O.NEW.KPHI.SV.W.0137.260705T0038Z-260705T0130Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Mount Holly NJ
838 PM EDT Sat Jul 4 2026
The National Weather Service in Mount Holly NJ has issued a
* Severe Thunderstorm Warning for...
New Castle County in northern Delaware...
Northwestern Salem County in southern New Jersey...
Southern Chester County in southeastern Pennsylvania...
Southwestern Delaware County in southeastern Pennsylvania...
* Until 930 PM EDT.
* At 838 PM EDT, a severe thunderstorm was located over Lombard, or
10 miles northwest of Elkton, 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...
Wilmington, Newark, Pennsville, Westtown, Carneys Point, Elsmere,
Kennett Square, New Castle, Penns Grove, Salem, Oxford, Alloway,
West Grove, Delaware City, Newport, Arden, Glen Roy, Stanton,
Cheyney, and Glasgow.
This includes the following highways...
New Jersey Turnpike near exit 1.
Interstate 95 in Pennsylvania between mile markers 0 and 1.
Interstate 95 in Delaware between mile markers 1 and 23.
Interstate 295 in New Jersey between mile markers 0 and 8.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
To report severe weather, contact your nearest law enforcement
agency. They will send your report to the National Weather Service
office in Mount Holly NJ.
Torrential rainfall is occurring with this storm, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.
&&
LAT...LON 3976 7606 3981 7603 3983 7604 3996 7549
3979 7541 3978 7544 3978 7541 3958 7531
3947 7577 3972 7579 3972 7607 3976 7608
TIME...MOT...LOC 0038Z 252DEG 27KT 3972 7595
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...<.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH
$$
MPS2 follow-up statements
156
WWUS51 KPHI 050117 RRA
SVSPHI
Severe Weather Statement
National Weather Service Mount Holly NJ
917 PM EDT Sat Jul 4 2026
PAC029-050127-
/O.CAN.KPHI.SV.W.0137.000000T0000Z-260705T0130Z/
Chester PA-
917 PM EDT Sat Jul 4 2026
...THE SEVERE THUNDERSTORM WARNING FOR SOUTHERN CHESTER COUNTY IS
CANCELLED...
The severe thunderstorm which prompted the warning has moved out of
the warned area. Therefore, the warning has been cancelled.
A Severe Thunderstorm Watch remains in effect until 1100 PM EDT for
northern Delaware...southern New Jersey...and southeastern
Pennsylvania.
LAT...LON 3991 7547 3990 7546 3979 7541 3978 7544
3978 7541 3977 7540 3958 7531 3955 7541
3955 7545 3988 7556
TIME...MOT...LOC 0117Z 260DEG 28KT 3971 7542
$$
DEC003-NJC033-PAC045-050130-
/O.CON.KPHI.SV.W.0137.000000T0000Z-260705T0130Z/
New Castle DE-Salem NJ-Delaware PA-
917 PM EDT Sat Jul 4 2026
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 930 PM EDT
FOR NORTHEASTERN NEW CASTLE...NORTHWESTERN SALEM AND SOUTHWESTERN
DELAWARE COUNTIES...
At 917 PM EDT, a severe thunderstorm was located over Carneys Point,
or near Wilmington, 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...
Wilmington, Pennsville, Carneys Point, Penns Grove, Salem, Alloway,
Arden, Elam, Concordville, Chelsea, Chester Heights, Marcus Hook,
Bellefonte, Ardentown, Ardencroft, Edgemoor, Boothwyn, Claymont,
Linwood, and Village Green-Green Ridge.
This includes the following highways...
New Jersey Turnpike near exit 1.
Interstate 95 in Pennsylvania between mile markers 0 and 1.
Interstate 95 in Delaware between mile markers 18 and 23.
Interstate 295 in New Jersey between mile markers 1 and 8.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
To report severe weather contact your nearest law enforcement agency.
They will send your report to the National Weather Service office in
Mount Holly NJ.
Torrential rainfall is occurring with this storm, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.
&&
LAT...LON 3991 7547 3990 7546 3979 7541 3978 7544
3978 7541 3977 7540 3958 7531 3955 7541
3955 7545 3988 7556
TIME...MOT...LOC 0117Z 260DEG 28KT 3971 7542
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...<.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH
$$
MPS166
WWUS51 KPHI 050121
SVSPHI
Severe Weather Statement
National Weather Service Mount Holly NJ
921 PM EDT Sat Jul 4 2026
DEC003-NJC033-PAC045-050130-
/O.EXP.KPHI.SV.W.0137.000000T0000Z-260705T0130Z/
New Castle DE-Salem NJ-Delaware PA-
921 PM EDT Sat Jul 4 2026
...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN NEW CASTLE...
NORTHWESTERN SALEM AND SOUTHWESTERN DELAWARE COUNTIES WILL EXPIRE AT
930 PM EDT...
The storm which prompted the warning has moved out of the area.
Therefore, the warning will be allowed to expire.
A Severe Thunderstorm Watch remains in effect until 1100 PM EDT for
northern Delaware...southern New Jersey...and southeastern
Pennsylvania.
To report severe weather, contact your nearest law enforcement
agency. They will relay your report to the National Weather Service
Mount Holly NJ.
Remember, a Severe Thunderstorm Warning still remains in effect
until 945 PM EDT.
LAT...LON 3991 7547 3990 7546 3979 7541 3978 7544
3978 7541 3977 7540 3958 7531 3955 7541
3955 7545 3988 7556
TIME...MOT...LOC 0120Z 252DEG 27KT 3971 7542
$$
MPSThe office that day
Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 4, 8:20 PM EDT | Special Marine Warning | PHI | 85 min | |
| Jul 4, 8:28 PM EDT | Severe Thunderstorm Warning | PHI | Hunterdon, Warren | 62 min |
| Jul 4, 8:48 PM EDT | Severe Thunderstorm Warning | PHI | Cumberland, Salem | 57 min |
| Jul 4, 8:59 PM EDT | Severe Thunderstorm Warning | PHI | Camden, Gloucester, Salem | 46 min |
| Jul 4, 9:13 PM EDT | Severe Thunderstorm Warning | PHI | Atlantic, Burlington, Camden, Cumberland, Gloucester, Salem | 62 min |
| Jul 4, 9:15 PM EDT | Severe Thunderstorm Warning | PHI | Burlington, Hunterdon, Mercer, Middlesex, Monmouth, Somerset | 75 min |
| Jul 4, 9:24 PM EDT | Special Marine Warning | PHI | 66 min | |
| Jul 4, 9:25 PM EDT | Special Marine Warning | PHI | 65 min | |
| Jul 4, 9:38 PM EDT | Special Marine Warning | PHI | 97 min | |
| Jul 4, 9:41 PM EDT | Severe Thunderstorm Warning | PHI | Atlantic, Cape May, Cumberland, Ocean | 49 min |
| Jul 4, 9:50 PM EDT | Severe Thunderstorm Warning | PHI | Atlantic, Burlington, Monmouth, Ocean | 55 min |
| Jul 4, 10:04 PM EDT | Special Marine Warning | PHI | 56 min | |
| Jul 4, 10:52 PM EDT | Heat Advisory | PHI | Atlantic, Burlington, Camden, Cape May, Cumberland, Gloucester and 9 more | 21 hr |
| Jul 4, 10:52 PM EDT | Special Marine Warning | PHI | 83 min | |
| Jul 4, 11:08 PM EDT | Special Marine Warning | PHI | 47 min | |
| Jul 5, 2:33 AM EDT | Flood Watch | PHI | Atlantic, Burlington, Camden, Cape May, Cumberland, Gloucester and 10 more | 41 hr |
| Jul 5, 7:06 PM EDT | Special Marine Warning | PHI | 47 min | |
| Jul 5, 7:30 PM EDT | Flash Flood Warning | PHI | Burlington, Mercer | 2 hr |
| Jul 4, 8:25 PM EDT | Severe Thunderstorm Warning | PHI | Berks, Bucks, Chester, Delaware, Montgomery, Philadelphia | 65 min |
| Jul 5, 7:33 PM EDT | Severe Thunderstorm Warning | PHI | Bucks, Montgomery, Philadelphia | 28 min |
| Jul 4, 8:17 PM EDT | Severe Thunderstorm Warning | PHI | Kent, New Castle | 43 min |
| Jul 4, 9:07 PM EDT | Severe Thunderstorm Warning | PHI | Sussex | 22 min |
| Jul 4, 9:52 PM EDT | Severe Thunderstorm Warning | PHI | Sussex | 38 min |
| Jul 5, 5:08 PM EDT | Severe Thunderstorm Warning | PHI | Kent, Sussex | 52 min |
| Jul 5, 6:54 PM EDT | Severe Thunderstorm Warning | PHI | Kent | 36 min |
| Jul 5, 7:04 PM EDT | Severe Thunderstorm Warning | PHI | Kent, New Castle | 41 min |
Nearby
Severe Thunderstorm Warnings in Pennsylvania, 2026Severe Thunderstorm Warnings in New Jersey, 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.