Alert archive / New Jersey / Severe Thunderstorm Warnings in 2025

Severe Thunderstorm Warning 45, NWS Philadelphia/Mount Holly

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

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at May 16, 2025, 12:20 PM EDT for 4 counties in New Jersey; New Castle County, Delaware; Delaware County, Philadelphia County, Pennsylvania. It was in force for 40 min. 4 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, 12:20 PM EDT (16:20 UTC)
Expired: May 16, 2025, 1:00 PM EDT
In force: 40 min
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

Counties New Castle County, DE, Camden County, NJ, Cumberland County, NJ, Gloucester County, NJ, Salem County, NJ, Delaware County, PA, Philadelphia County, PA

The radar

The Philadelphia radar (KDIX), 84 km from the middle of the area, began a volume at 16:19 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, 12:36 PM EDT	TSTM WND DMG	2 Ne Hopewell Twp., NJ	Report of a heavily damaged shed around the Bridgeton area. Possible Tornado.
May 16, 12:38 PM EDT	TSTM WND DMG	Washington Twp, NJ	Trees and powerlines down. Time estimated from radar.
May 16, 12:41 PM EDT	TSTM WND DMG	Monroe Twp, NJ	Trees and wires down throughout the area. Time estimated from radar.
May 16, 12:42 PM EDT	TORNADO	3 Wsw Monroe Twp, NJ	Delayed Report...Updated starting location and track and increased intensity of Collings Lakes tornado. The EF-1 tornado originated in Williamstown near the intersection of Janvier Road and Tuckahoe Road. It made a discontinuous path to the south-southeast bef

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

Wallops Is Stn, VA (KWAL), launched 12:00Z, 4.3 hours before the alert went out and 193 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: 1302 J/kg
Mixed-layer CIN: -77 J/kg
Mixed-layer LCL: 868 m above ground
0-6 km bulk shear: 43 kt
0-1 km storm-relative helicity: 71 m²/s²
0-3 km storm-relative helicity: 197 m²/s²
Significant tornado parameter: -0.1
Supercell composite: -0.7

Open this sounding in Storm Lab

The text

As transmitted.

056 
WUUS51 KPHI 161620
SVRPHI
DEC003-NJC007-011-015-033-PAC045-101-161700-
/O.NEW.KPHI.SV.W.0045.250516T1620Z-250516T1700Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Mount Holly NJ
1220 PM 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 Cumberland County in southern New Jersey...
  Salem County in southern New Jersey...
  Southern Camden County in southern New Jersey...
  Gloucester County in southern New Jersey...
  Southwestern Philadelphia County in southeastern Pennsylvania...
  Southeastern Delaware County in southeastern Pennsylvania...

* Until 100 PM EDT.

* At 1219 PM EDT, severe thunderstorms were located along a line
  extending from Gibbstown to near Penns Grove to Delaware Memorial
  Bridge, moving southeast 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, Wilmington, Vineland, Bridgeton, Gloucester City,
  Chester, Deptford, West Deptford, Glassboro, Lindenwold,
  Pennsville, Bellmawr, Woodbury, Pitman, Clayton, Carneys Point,
  Berlin, Folcroft, Elsmere, and Paulsboro.

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 these storms. Move indoors
immediately. Remember, if you can hear thunder, you are close enough
to be struck by lightning.

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

&&

LAT...LON 3981 7541 3992 7519 3972 7476 3945 7505
      3939 7550 3946 7555 3978 7569
TIME...MOT...LOC 1619Z 318DEG 28KT 3980 7528 3972 7541 3970 7555 

HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...<.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

Staarmann

3 follow-up statements

815 
WWUS51 KPHI 161633
SVSPHI

Severe Weather Statement
National Weather Service Mount Holly NJ
1233 PM EDT Fri May 16 2025

DEC003-PAC045-101-161642-
/O.CAN.KPHI.SV.W.0045.000000T0000Z-250516T1700Z/
New Castle DE-Philadelphia PA-Delaware PA-
1233 PM EDT Fri May 16 2025

...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN NEW CASTLE...
SOUTHWESTERN PHILADELPHIA AND SOUTHEASTERN DELAWARE COUNTIES IS
CANCELLED...

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

A Severe Thunderstorm Watch remains in effect until 500 PM EDT for
northern Delaware...and southern New Jersey.

LAT...LON 3945 7505 3941 7536 3971 7552 3972 7550
      3971 7550 3972 7548 3976 7535 3989 7512
      3972 7476
TIME...MOT...LOC 1632Z 307DEG 36KT 3976 7499 3963 7513 3962 7535 

$$

NJC007-011-015-033-161700-
/O.CON.KPHI.SV.W.0045.000000T0000Z-250516T1700Z/
Cumberland NJ-Salem NJ-Camden NJ-Gloucester NJ-
1233 PM EDT Fri May 16 2025

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 100 PM EDT
FOR NORTHWESTERN CUMBERLAND...SALEM...SOUTHERN CAMDEN AND GLOUCESTER
COUNTIES...

At 1232 PM EDT, severe thunderstorms were located along a line
extending from near Sicklerville to near Franklinville to near
Woodstown, moving southeast at 40 mph.

HAZARD...60 mph wind gusts.

SOURCE...Radar indicated.

IMPACT...Damage to roofs, siding, trees, and power lines is 
         possible.

Locations impacted include...
Wilmington, Vineland, Bridgeton, Gloucester City, Deptford, West
Deptford, Glassboro, Lindenwold, Pennsville, Bellmawr, Woodbury,
Pitman, Clayton, Carneys Point, Berlin, Paulsboro, Penns Grove,
Buena, Magnolia, and Westville.

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 these storms.
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 these storms, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.

&&

LAT...LON 3945 7505 3941 7536 3971 7552 3972 7550
      3971 7550 3972 7548 3976 7535 3989 7512
      3972 7476
TIME...MOT...LOC 1632Z 307DEG 36KT 3976 7499 3963 7513 3962 7535 

HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...<.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

Staarmann

695 
WWUS51 KPHI 161639
SVSPHI

Severe Weather Statement
National Weather Service Mount Holly NJ
1239 PM EDT Fri May 16 2025

NJC007-011-015-033-161700-
/O.CON.KPHI.SV.W.0045.000000T0000Z-250516T1700Z/
Cumberland NJ-Salem NJ-Camden NJ-Gloucester NJ-
1239 PM EDT Fri May 16 2025

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 100 PM EDT
FOR NORTHWESTERN CUMBERLAND...NORTHEASTERN SALEM...SOUTHERN CAMDEN
AND GLOUCESTER COUNTIES...

At 1239 PM EDT, severe thunderstorms were located along a line
extending from Sicklerville to Franklinville to near Alloway, moving
southeast at 30 mph.

HAZARD...70 mph wind gusts.

SOURCE...Radar indicated.

IMPACT...Expect considerable tree damage. Damage is likely to mobile 
         homes, roofs, and outbuildings.

Locations impacted include...
Vineland, Bridgeton, Glassboro, Lindenwold, Pitman, Clayton, Berlin,
Buena, Woodstown, Alloway, Chesilhurst, Newfield, Elmer, Shiloh,
Franklinville, Sicklerville, Atco, Victory Lakes, Williamstown, and
Olivet.

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 these storms.
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 these storms, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.

&&

LAT...LON 3942 7528 3969 7542 3972 7524 3985 7504
      3972 7476 3945 7505
TIME...MOT...LOC 1639Z 318DEG 28KT 3972 7495 3959 7509 3958 7531 

THUNDERSTORM DAMAGE THREAT...CONSIDERABLE
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...<.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...70 MPH

$$

Staarmann

875 
WWUS51 KPHI 161647
SVSPHI

Severe Weather Statement
National Weather Service Mount Holly NJ
1247 PM EDT Fri May 16 2025

NJC007-011-015-033-161700-
/O.CON.KPHI.SV.W.0045.000000T0000Z-250516T1700Z/
Cumberland NJ-Salem NJ-Camden NJ-Gloucester NJ-
1247 PM EDT Fri May 16 2025

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 100 PM EDT
FOR NORTHWESTERN CUMBERLAND...EAST CENTRAL SALEM...SOUTHEASTERN
CAMDEN AND SOUTHEASTERN GLOUCESTER COUNTIES...

At 1247 PM EDT, severe thunderstorms were located along a line
extending from Chesilhurst to Newfield to near Seabrook Farms, moving
southeast at 35 mph.

HAZARD...70 mph wind gusts.

SOURCE...Radar indicated.

IMPACT...Expect considerable tree damage. Damage is likely to mobile 
         homes, roofs, and outbuildings.

Locations impacted include...
Vineland, Bridgeton, Glassboro, Clayton, Berlin, Buena, Alloway,
Chesilhurst, Newfield, Elmer, Shiloh, Atco, Franklinville, Victory
Lakes, Sicklerville, Williamstown, Olivet, Malaga, Seabrook Farms,
and Rosenhayn.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Remain alert for a possible tornado! Tornadoes can develop quickly
from severe thunderstorms. If you spot a tornado go at once into the
basement or small central room in a sturdy structure.

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

Frequent cloud to ground lightning is occurring with these storms.
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 these storms, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.

&&

LAT...LON 3942 7528 3962 7538 3968 7512 3981 7495
      3972 7476 3945 7505
TIME...MOT...LOC 1647Z 314DEG 29KT 3971 7488 3956 7501 3954 7527 

TORNADO...POSSIBLE
THUNDERSTORM DAMAGE THREAT...CONSIDERABLE
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...<.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...70 MPH

$$

Staarmann

The office that day

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

Issued	Product	Office	Counties	Lasted
May 15, 9:30 PM EDT	Marine Dense Fog Advisory	PHI		15 hr
May 15, 9:34 PM EDT	Dense Fog Advisory	PHI	Atlantic, Burlington, Camden, Cape May, Cumberland, Gloucester and 10 more	12 hr
May 16, 11:16 AM EDT	Severe Thunderstorm Warning	PHI	Camden, Gloucester	59 min
May 16, 11:32 AM EDT	Flash Flood Warning	PHI	Burlington, Camden, Gloucester, Mercer, Salem	4 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
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, 11:41 AM EDT	Flash Flood Warning	PHI	Chester, Delaware	4 hr
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

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.