Alert archive / New Jersey / Severe Thunderstorm Warnings in 2025

Severe Thunderstorm Warning 12, NWS Philadelphia/Mount Holly

April 4, 20254 counties in New Jersey; New Castle County, Delaware; 4 counties in Pennsylvania

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Apr 4, 2025, 4:40 AM EDT for 4 counties in New Jersey; New Castle County, Delaware; 4 counties in Pennsylvania. It was in force for 50 min. 35 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: Apr 4, 2025, 4:40 AM EDT (08:40 UTC)
Expired: Apr 4, 2025, 5:30 AM EDT
In force: 50 min
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

Counties New Castle County, DE, Burlington County, NJ, Camden County, NJ, Gloucester County, NJ, Salem County, NJ, Chester County, PA, Delaware County, PA, Montgomery County, PA, Philadelphia County, PA

The radar

The Philadelphia radar (KDIX), 80 km from the middle of the area, began a volume at 08:43 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
Apr 4, 4:42 AM EDT	HAIL 0.75	Swarthmore, PA
Apr 4, 4:44 AM EDT	TSTM WND DMG	Nether Providence Twp, PA	Tree down blocking a lane on 476 South Bound. Time estimated from radar.
Apr 4, 4:45 AM EDT	TSTM WND DMG	Brookhaven, PA	Scattered trees down. Time estimated from radar.
Apr 4, 4:45 AM EDT	TSTM WND DMG	Media, PA	Multiple trees and wires down. Time estimated from radar.
Apr 4, 4:45 AM EDT	TSTM WND DMG	Wallingford, PA	Multiple large trees snapped. Time estimated from radar.
Apr 4, 4:47 AM EDT	TSTM WND GST 65	Brookhaven, PA	Estimated 65 mph wind gust.
Apr 4, 4:47 AM EDT	HAIL 1.25	Brookhaven, PA	Also estimated 65 mph wind gusts.
Apr 4, 4:48 AM EDT	TSTM WND DMG	Media, PA	A strong downburst of winds from a severe thunderstorm produced significant damage early Friday morning. The most significant damage occurred in the borough of Media and Nether Providence Township in Delaware County, Pennsylvania. In Media, the most concentrat
Apr 4, 4:50 AM EDT	TSTM WND DMG	1 Nw Nether Providence, PA	Several trunks of large trees snapped.
Apr 4, 4:50 AM EDT	TSTM WND DMG	Media, PA	Multiple trees uprooted and snapped. Time estimated from radar.
Apr 4, 4:50 AM EDT	TSTM WND DMG	Media, PA	Roof damage. Time estimated from radar.
Apr 4, 4:50 AM EDT	TSTM WND DMG	Swarthmore, PA	Tree uprooted. Time estimated from radar.
Apr 4, 4:54 AM EDT	TSTM WND DMG	Swarthmore, PA	Multiple tree limbs down.
Apr 4, 4:54 AM EDT	HAIL 1	Swarthmore, PA	Quarter sized hail.
Apr 4, 4:58 AM EDT	TSTM WND GST 52	1 Wsw Philadelphia Inte, PA
Apr 4, 4:58 AM EDT	TSTM WND GST 52	Philadelphia Internatio, PA	ASOS station KPHL Philadelphia International Airport.
Apr 4, 5:00 AM EDT	TSTM WND DMG	National Park, NJ	Multiple trees and wires down. Time estimated from radar.
Apr 4, 5:00 AM EDT	TSTM WND DMG	Westville, NJ	Partial structural collapse from a tree falling into a building. Time estimated from radar.
Apr 4, 5:00 AM EDT	HAIL 1	1 W Folsom, PA	Report from mPING: Quarter (1.00 in.).
Apr 4, 5:00 AM EDT	HAIL 1	Philadelphia Internatio, PA	Airport observer reported 1 inch hail at PHL. The period of the Hail event was 11 minutes.
Apr 4, 5:01 AM EDT	HAIL 0.75	1 Nw Thorofare, NJ	Report from mPING: Dime (0.75 in.).
Apr 4, 5:03 AM EDT	HAIL 0.25	Bellmawr, NJ
Apr 4, 5:05 AM EDT	TSTM WND DMG	1 Se West Deptford Twp, NJ	Several trees downed and trunks snapped. Time estimated by radar.
Apr 4, 5:05 AM EDT	TSTM WND DMG	1 S Westville, NJ	Tree blown down on to a vehicle. Time estimated from radar.
Apr 4, 5:05 AM EDT	TSTM WND DMG	West Deptford Twp, NJ	Multiple trees down, a fence destroyed, and a window broken. Time estimated from radar.
Apr 4, 5:05 AM EDT	HAIL 0.25	Laurel Springs, NJ
Apr 4, 5:05 AM EDT	HAIL 0.7	National Park, NJ	Time estimated from radar.
Apr 4, 5:06 AM EDT	TSTM WND DMG	1 Ese Glendora, NJ	Several trees uprooted, trunks snapped, and fences down near Timber Creek Park. Time estimated by radar.
Apr 4, 5:09 AM EDT	HAIL 1	Gloucester Twp, NJ
Apr 4, 5:10 AM EDT	HAIL 1	Blackwood, NJ
Apr 4, 5:12 AM EDT	TSTM WND DMG	1 N Gloucester Twp, NJ	Multiple trees down in Broadmoor neighborhood.
Apr 4, 5:15 AM EDT	TSTM WND DMG	1 E Somerdale, NJ	Trees down. Time estimated from radar.
Apr 4, 5:15 AM EDT	TSTM WND DMG	Gloucester Twp, NJ	Multiple trees and wires down. Time estimated from radar.
Apr 4, 5:15 AM EDT	TSTM WND DMG	Somerdale, NJ	Multiple trees and wires down. Time estimated from radar.
Apr 4, 5:20 AM EDT	HAIL 0.75	1 N Paulsboro, NJ	Report from mPING: Dime (0.75 in.).

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The nearest sounding before it

Washington/Dulle, VA (KIAD), launched 00:00Z, 8.7 hours before the alert went out and 203 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.

Skew-T log-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.

Mixed-layer CAPE: 391 J/kg
Mixed-layer CIN: -53 J/kg
Mixed-layer LCL: 1083 m above ground
0-6 km bulk shear: 31 kt
0-1 km storm-relative helicity: 140 m²/s²
0-3 km storm-relative helicity: 219 m²/s²
Significant tornado parameter: 0.2
Supercell composite: 0.9

Open this sounding in Storm Lab

The text

As transmitted.

039 
WUUS51 KPHI 040840
SVRPHI
DEC003-NJC005-007-015-033-PAC029-045-091-101-040930-
/O.NEW.KPHI.SV.W.0012.250404T0840Z-250404T0930Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Mount Holly NJ
440 AM EDT Fri Apr 4 2025

The National Weather Service in Mount Holly NJ has issued a

* Severe Thunderstorm Warning for...
  Northeastern New Castle County in northern Delaware...
  Northwestern Salem County in southern New Jersey...
  Camden County in southern New Jersey...
  Gloucester County in southern New Jersey...
  West central Burlington County in southern New Jersey...
  Southeastern Montgomery County in southeastern Pennsylvania...
  Southeastern Chester County in southeastern Pennsylvania...
  Southwestern Philadelphia County in southeastern Pennsylvania...
  Delaware County in southeastern Pennsylvania...

* Until 530 AM EDT.

* At 439 AM EDT, a severe thunderstorm was located over Concordville,
  or near West Chester, moving east at 55 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...
  Oak Valley, Merchantville, Trainer, Eddystone, Village Green-Green
  Ridge, Talleyville, Collingswood, Chesilhurst, Elam, Golden
  Triangle, Pine Hill, Prospect Park, Camden, Gradyville, Penn Wynne,
  Broomall, Haddonfield, Magnolia, Gloucester City, and Clayton.

This includes the following highways...
 New Jersey Turnpike between exits 2 and 4.
 Interstate 95 in Pennsylvania between mile markers 0 and 26.
 Interstate 95 in Delaware between mile markers 17 and 23.
 Interstate 76 in Pennsylvania between mile markers 341 and 351.
 Interstate 76 in New Jersey between mile markers 0 and 3.
 Interstate 295 in New Jersey between mile markers 8 and 42.
 Interstate 676 in Pennsylvania between mile markers 0 and 1.
 Interstate 676 in New Jersey between mile markers 0 and 4.
 Interstate 476 in Pennsylvania between mile markers 0 and 11.
 Atlantic City Expressway between mile markers 31 and 44.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

In addition to large hail and damaging winds, frequent cloud to
ground lightning is occurring with this storm. Move indoors
immediately. Remember, if you can hear thunder, you are close enough
to be struck by lightning.

&&

LAT...LON 3981 7572 4003 7558 3998 7482 3961 7487
TIME...MOT...LOC 0839Z 275DEG 47KT 3989 7552 

HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.00 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

Gorse

3 follow-up statements

420 
WWUS51 KPHI 040851
SVSPHI

Severe Weather Statement
National Weather Service Mount Holly NJ
451 AM EDT Fri Apr 4 2025

DEC003-NJC033-PAC029-091-040900-
/O.CAN.KPHI.SV.W.0012.000000T0000Z-250404T0930Z/
New Castle DE-Salem NJ-Montgomery PA-Chester PA-
451 AM EDT Fri Apr 4 2025

...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN NEW CASTLE...
NORTHWESTERN SALEM...SOUTHEASTERN MONTGOMERY AND SOUTHEASTERN CHESTER
COUNTIES IS CANCELLED...

The severe thunderstorm which prompted the warning has moved out of 
the warned area. Therefore, the warning has been cancelled.

LAT...LON 3961 7487 3981 7543 3982 7544 3983 7550
      4001 7538 4001 7530 3998 7527 4000 7523
      3998 7482
TIME...MOT...LOC 0850Z 271DEG 47KT 3988 7534 

$$

NJC005-007-015-PAC045-101-040930-
/O.CON.KPHI.SV.W.0012.000000T0000Z-250404T0930Z/
Camden NJ-Gloucester NJ-Burlington NJ-Philadelphia PA-Delaware PA-
451 AM EDT Fri Apr 4 2025

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 530 AM EDT
FOR CAMDEN...NORTHERN GLOUCESTER...WEST CENTRAL BURLINGTON...
SOUTHWESTERN PHILADELPHIA AND DELAWARE COUNTIES...

At 450 AM EDT, a severe thunderstorm was located over Swarthmore, or
11 miles west of Gloucester City, moving east at 55 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...
Oak Valley, Merchantville, Trainer, Eddystone, Village Green-Green
Ridge, Collingswood, Chesilhurst, Golden Triangle, Pine Hill,
Prospect Park, Camden, Broomall, Haddonfield, Magnolia, Gloucester
City, Mount Ephraim, Chester, Chester Township, Rutledge, and
Clementon.

This includes the following highways...
 New Jersey Turnpike between exits 3 and 4.
 Interstate 95 in Pennsylvania between mile markers 1 and 25.
 Interstate 76 in Pennsylvania between mile markers 341 and 351.
 Interstate 76 in New Jersey between mile markers 0 and 3.
 Interstate 295 in New Jersey between mile markers 12 and 42.
 Interstate 676 in Pennsylvania between mile markers 0 and 1.
 Interstate 676 in New Jersey between mile markers 0 and 4.
 Interstate 476 in Pennsylvania between mile markers 0 and 11.
 Atlantic City Expressway between mile markers 31 and 44.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

Frequent cloud to ground lightning is occurring with this storm. Move
indoors immediately. Lightning is one of nature's leading killers.
Remember, if you can hear thunder, you are close enough to be struck
by lightning.

&&

LAT...LON 3961 7487 3981 7543 3982 7544 3983 7550
      4001 7538 4001 7530 3998 7527 4000 7523
      3998 7482
TIME...MOT...LOC 0850Z 271DEG 47KT 3988 7534 

HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.00 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

Gorse

570 
WWUS51 KPHI 040906
SVSPHI

Severe Weather Statement
National Weather Service Mount Holly NJ
506 AM EDT Fri Apr 4 2025

NJC005-007-015-PAC045-101-040930-
/O.CON.KPHI.SV.W.0012.000000T0000Z-250404T0930Z/
Camden NJ-Gloucester NJ-Burlington NJ-Philadelphia PA-Delaware PA-
506 AM EDT Fri Apr 4 2025

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 530 AM EDT
FOR CAMDEN...NORTHEASTERN GLOUCESTER...WEST CENTRAL BURLINGTON...
SOUTHWESTERN PHILADELPHIA AND EAST CENTRAL DELAWARE COUNTIES...

At 504 AM EDT, a severe thunderstorm was located over Bellmawr, or
over Gloucester City, moving east at 55 mph.

HAZARD...60 mph wind gusts and quarter size hail. 1 inch hail was 
         observed at the Philadelphia International Airport along 
         with a wind gust to 52 mph.

SOURCE...Trained weather spotters.

IMPACT...Minor damage to vehicles is possible. Wind damage to roofs, 
         siding, trees, and power lines is possible.

Locations impacted include...
Oak Valley, Moorestown-Lenola, Merchantville, Tavistock, Gibbsboro,
Pennsauken, Collingswood, Chesilhurst, Barclay-Kingston, Cherry Hill
Mall, Golden Triangle, Brooklawn, Marlton, Pine Hill, Camden, Berlin,
Haddonfield, Magnolia, Kensington, and Gloucester City.

This includes the following highways...
 New Jersey Turnpike between exits 3 and 4.
 Interstate 95 in Pennsylvania between mile markers 12 and 25.
 Interstate 76 in Pennsylvania between mile markers 341 and 351.
 Interstate 76 in New Jersey between mile markers 0 and 3.
 Interstate 295 in New Jersey between mile markers 17 and 42.
 Interstate 676 in Pennsylvania between mile markers 0 and 1.
 Interstate 676 in New Jersey between mile markers 0 and 4.
 Atlantic City Expressway between mile markers 31 and 44.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

Frequent cloud to ground lightning is occurring with this storm. Move
indoors immediately. Lightning is one of nature's leading killers.
Remember, if you can hear thunder, you are close enough to be struck
by lightning.

&&

LAT...LON 3976 7528 4000 7523 3998 7482 3961 7487
TIME...MOT...LOC 0904Z 271DEG 47KT 3986 7510 

HAIL THREAT...OBSERVED
MAX HAIL SIZE...1.00 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

Gorse

450 
WWUS51 KPHI 040925
SVSPHI

Severe Weather Statement
National Weather Service Mount Holly NJ
525 AM EDT Fri Apr 4 2025

NJC005-007-015-PAC045-101-040934-
/O.EXP.KPHI.SV.W.0012.000000T0000Z-250404T0930Z/
Camden NJ-Gloucester NJ-Burlington NJ-Philadelphia PA-Delaware PA-
525 AM EDT Fri Apr 4 2025

...THE SEVERE THUNDERSTORM WARNING FOR CAMDEN...NORTHEASTERN
GLOUCESTER...WEST CENTRAL BURLINGTON...SOUTHWESTERN PHILADELPHIA AND
EAST CENTRAL DELAWARE COUNTIES WILL EXPIRE AT 530 AM EDT...

The storm which prompted the warning continues to move out of the 
area. Therefore, this warning will be allowed to expire.

LAT...LON 3976 7528 4000 7523 3998 7482 3961 7487
TIME...MOT...LOC 0924Z 275DEG 47KT 3984 7482 

$$

Gorse

The office that day

Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Apr 4, 5:12 AM EDT	Severe Thunderstorm Warning	PHI	Atlantic, Burlington, Camden, Gloucester, Ocean	63 min
Apr 4, 5:31 AM EDT	Special Marine Warning	PHI		59 min
Apr 4, 5:46 AM EDT	Severe Thunderstorm Warning	PHI	Atlantic, Burlington, Camden, Cumberland, Gloucester, Ocean and 1 more	42 min
Apr 4, 6:21 AM EDT	Special Marine Warning	PHI		26 min
Apr 4, 3:00 PM EDT	Small Craft Advisory	PHI		51 hr

Nearby

Severe Thunderstorm Warnings in New Jersey, 2025 Severe Thunderstorm Warnings in Pennsylvania, 2025 Severe Thunderstorm Warnings in Delaware, 2025 Every severe thunderstorm warning in 2025

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.