Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2025

Severe Thunderstorm Warning 42, NWS Philadelphia/Mount Holly

May 16, 20254 counties in Pennsylvania; Camden County, Gloucester County, New Jersey; New Castle County, Delaware

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at May 16, 2025, 11:16 AM EDT for 4 counties in Pennsylvania; Camden County, Gloucester County, New Jersey; New Castle County, Delaware. It was in force for 59 min. 3 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: May 16, 2025, 11:16 AM EDT (15:16 UTC)
Expired: May 16, 2025, 12:15 PM EDT
In force: 59 min
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

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

The radar

The Philadelphia radar (KDIX), 73 km from the middle of the area, began a volume at 15:15 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
May 16, 12:06 PM EDT	TSTM WND DMG	Fairmount Park, PA	Tree onto car. Time estimated from radar.
May 16, 12:06 PM EDT	TSTM WND DMG	Philadelphia, PA	Telephone pole into a roof. Time estimated from radar.
May 16, 12:06 PM EDT	TSTM WND DMG	Roxborough, PA	Wires down. 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
May 16, 10:06 AM EDT	Severe Thunderstorm Watch	SPC	6 hr

The nearest sounding before it

Washington/Dulle, VA (KIAD), launched 12:00Z, 3.3 hours before the alert went out and 214 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: 657 J/kg
Mixed-layer CIN: -104 J/kg
Mixed-layer LCL: 781 m above ground
0-6 km bulk shear: 39 kt
0-1 km storm-relative helicity: 33 m²/s²
0-3 km storm-relative helicity: 31 m²/s²
Significant tornado parameter: 0.1
Supercell composite: 0.9

Open this sounding in Storm Lab

The text

As transmitted.

136 
WUUS51 KPHI 161516
SVRPHI
DEC003-NJC007-015-PAC029-045-091-101-161615-
/O.NEW.KPHI.SV.W.0042.250516T1516Z-250516T1615Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Mount Holly NJ
1116 AM EDT Fri May 16 2025

The National Weather Service in Mount Holly NJ has issued a

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

* Until 1215 PM EDT.

* At 1116 AM EDT, a severe thunderstorm was located over Marshallton,
  or near West Chester, moving east at 35 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, Camden, West Chester, Gloucester City, Chester,
  Deptford, West Deptford, Glassboro, Coatesville, Bellmawr, Yeadon,
  Westtown, Woodbury, Pitman, Downingtown, Palmyra, Folcroft,
  Swarthmore, Paulsboro, and Magnolia.

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.

Torrential rainfall is occurring with this storm, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.

&&

LAT...LON 4005 7579 4001 7504 3999 7506 4000 7504
      3998 7501 3995 7502 3994 7500 3969 7513
      3993 7583
TIME...MOT...LOC 1516Z 282DEG 31KT 3997 7567 

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

$$

Staarmann

2 follow-up statements

656 
WWUS51 KPHI 161534
SVSPHI

Severe Weather Statement
National Weather Service Mount Holly NJ
1134 AM EDT Fri May 16 2025

DEC003-161543-
/O.CAN.KPHI.SV.W.0042.000000T0000Z-250516T1615Z/
New Castle DE-
1134 AM EDT Fri May 16 2025

...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN NEW CASTLE 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 500 PM EDT for
southern New Jersey...and southeastern Pennsylvania.

LAT...LON 4004 7562 4001 7504 3999 7506 4000 7504
      3998 7501 3995 7502 3994 7500 3969 7513
      3990 7561 3996 7564
TIME...MOT...LOC 1533Z 282DEG 31KT 3994 7550 

$$

NJC007-015-PAC029-045-091-101-161615-
/O.CON.KPHI.SV.W.0042.000000T0000Z-250516T1615Z/
Camden NJ-Gloucester NJ-Montgomery PA-Chester PA-Philadelphia PA-
Delaware PA-
1134 AM EDT Fri May 16 2025

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1215 PM EDT
FOR NORTHWESTERN CAMDEN...NORTHWESTERN GLOUCESTER...SOUTHEASTERN
MONTGOMERY...EAST CENTRAL CHESTER...SOUTHWESTERN PHILADELPHIA AND
DELAWARE COUNTIES...

At 1133 AM EDT, a severe thunderstorm was located over Gradyville, or
near West Chester, moving east at 35 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, Camden, West Chester, Gloucester City, Chester,
Deptford, West Deptford, Glassboro, Bellmawr, Yeadon, Westtown,
Woodbury, Pitman, Palmyra, Folcroft, Swarthmore, Paulsboro, Magnolia,
Westville, and Narberth.

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.

Torrential rainfall is occurring with this storm, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.

&&

LAT...LON 4004 7562 4001 7504 3999 7506 4000 7504
      3998 7501 3995 7502 3994 7500 3969 7513
      3990 7561 3996 7564
TIME...MOT...LOC 1533Z 282DEG 31KT 3994 7550 

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

$$

Staarmann

351 
WWUS51 KPHI 161607
SVSPHI

Severe Weather Statement
National Weather Service Mount Holly NJ
1207 PM EDT Fri May 16 2025

NJC007-015-PAC029-045-091-101-161616-
/O.EXP.KPHI.SV.W.0042.000000T0000Z-250516T1615Z/
Camden NJ-Gloucester NJ-Montgomery PA-Chester PA-Philadelphia PA-
Delaware PA-
1207 PM EDT Fri May 16 2025

...THE SEVERE THUNDERSTORM WARNING FOR NORTHWESTERN CAMDEN...
NORTHWESTERN GLOUCESTER...SOUTHEASTERN MONTGOMERY...EAST CENTRAL
CHESTER...SOUTHWESTERN PHILADELPHIA AND DELAWARE COUNTIES WILL EXPIRE
AT 1215 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.  However gusty 
winds and heavy rainfall leading to flash flooding are still 
possible with this thunderstorm. A Flash Flood Warning remains in 
effect until 330 PM EDT for much of this area.

A Severe Thunderstorm Watch remains in effect until 500 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 4004 7562 4001 7504 3999 7506 4000 7504
      3998 7501 3995 7502 3994 7500 3969 7513
      3990 7561 3996 7564
TIME...MOT...LOC 1606Z 280DEG 25KT 3991 7528 

$$

Staarmann

The office that day

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

Issued	Product	Office	Counties	Lasted
May 15, 9:34 PM EDT	Dense Fog Advisory	PHI	Berks, Bucks, Carbon, Chester, Delaware, Lehigh and 4 more	12 hr
May 16, 10:24 AM EDT	Severe Thunderstorm Warning	PHI	Berks, Bucks, Carbon, Chester, Lehigh, Monroe and 2 more	66 min
May 16, 11:22 AM EDT	Severe Thunderstorm Warning	PHI	Bucks, Chester, Montgomery, Philadelphia	53 min
May 16, 11:32 AM EDT	Flash Flood Warning	PHI	Bucks, Delaware, Montgomery, Philadelphia	4 hr
May 16, 11:41 AM EDT	Flash Flood Warning	PHI	Chester, Delaware	4 hr
May 16, 12:20 PM EDT	Severe Thunderstorm Warning	PHI	Delaware, Philadelphia	40 min
May 16, 12:21 PM EDT	Flash Flood Warning	PHI	Bucks, Montgomery	4 hr
May 16, 2:02 PM EDT	River Flood Warning	PHI	Chester	5 hr
May 16, 3:29 PM EDT	Areal Flood Warning	PHI	Berks	6 hr
May 16, 3:53 PM EDT	Areal Flood Warning	PHI	Montgomery	100 min
May 16, 4:42 PM EDT	Areal Flood Warning	PHI	Montgomery, Philadelphia	4 hr
May 16, 5:15 PM EDT	Areal Flood Warning	PHI	Bucks	112 min
May 16, 6:43 PM EDT	Areal Flood Warning	PHI	Philadelphia	113 min
May 15, 9:30 PM EDT	Marine Dense Fog Advisory	PHI		15 hr
May 16, 11:41 AM EDT	Special Marine Warning	PHI		49 min
May 16, 11:46 AM EDT	Severe Thunderstorm Warning	PHI	Cumberland, Gloucester, Salem	59 min
May 16, 12:22 PM EDT	Tornado Warning	PHI	Cumberland, Salem	23 min
May 16, 12:31 PM EDT	Flash Flood Warning Considerable damage threat	PHI	Camden, Gloucester	4 hr
May 16, 12:42 PM EDT	Tornado Warning	PHI	Atlantic, Cape May, Cumberland	48 min
May 16, 12:45 PM EDT	Tornado Warning	PHI	Atlantic, Camden, Gloucester	30 min
May 16, 12:47 PM EDT	Flash Flood Warning Considerable damage threat	PHI	Burlington, Camden, Gloucester, Salem	4 hr
May 16, 12:49 PM EDT	Severe Thunderstorm Warning Considerable damage threat	PHI	Atlantic, Burlington, Camden, Cape May, Cumberland, Gloucester and 1 more	56 min
May 16, 12:51 PM EDT	Special Marine Warning	PHI		114 min
May 16, 12:52 PM EDT	Tornado Warning	PHI	Atlantic, Camden, Gloucester	23 min
May 16, 1:26 PM EDT	Severe Thunderstorm Warning	PHI	Cape May, Cumberland	49 min
May 16, 1:28 PM EDT	Flash Flood Warning	PHI	Burlington, Ocean	3 hr
May 16, 1:32 PM EDT	Special Marine Warning	PHI		88 min
May 16, 1:36 PM EDT	Flash Flood Warning Considerable damage threat	PHI	Atlantic, Cape May, Ocean	3 hr
May 16, 1:58 PM EDT	Severe Thunderstorm Warning	PHI	Cape May	32 min
May 16, 2:01 PM EDT	Special Marine Warning	PHI		86 min
May 16, 2:24 PM EDT	Areal Flood Warning	PHI	Hunterdon, Somerset	94 min
May 16, 6:31 PM EDT	Special Marine Warning	PHI		119 min
May 16, 6:35 PM EDT	Severe Thunderstorm Warning Considerable damage threat	PHI	Cape May, Cumberland, Gloucester, Salem	70 min
May 16, 1:52 PM EDT	Tornado Warning	PHI	Sussex	38 min
May 16, 2:18 PM EDT	Severe Thunderstorm Warning	PHI	Sussex	42 min
May 16, 2:23 PM EDT	Tornado Warning	PHI	Sussex	52 min
May 16, 6:56 PM EDT	Tornado Warning	PHI	Sussex	34 min

Nearby

Severe Thunderstorm Warnings in Pennsylvania, 2025 Severe Thunderstorm Warnings in New Jersey, 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.