Alert archive / New Jersey / Severe Thunderstorm Warnings in 2025

Severe Thunderstorm Warning 111, NWS Philadelphia/Mount Holly

June 30, 20254 counties in New Jersey

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Jun 30, 2025, 4:03 PM EDT for 4 counties in New Jersey. It was in force for 42 min. 8 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: Jun 30, 2025, 4:03 PM EDT (20:03 UTC)
Expired: Jun 30, 2025, 4:45 PM EDT
In force: 42 min
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

Counties Mercer County, NJ, Middlesex County, NJ, Monmouth County, NJ, Somerset County, NJ

The radar

The Philadelphia radar (KDIX), 38 km from the middle of the area, began a volume at 20:07 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
Jun 30, 4:04 PM EDT	TSTM WND DMG	Ewing, NJ	Multiple reports of trees and wires down. Time estimated from radar.
Jun 30, 4:04 PM EDT	TSTM WND DMG	Hamilton Twp, NJ	Multiple reports of trees and wires down. Time estimated from radar.
Jun 30, 4:04 PM EDT	TSTM WND DMG	Lawrenceville, NJ	Multiple reports of trees and wires down. Time estimated from radar.
Jun 30, 4:15 PM EDT	TSTM WND DMG	West Windsor Twp., NJ	Multiple reports of trees and wires down. Time estimated from radar.
Jun 30, 4:23 PM EDT	TSTM WND DMG	1 Wnw Plainsboro Townsh, NJ	Multiple trees uprooted and large tree branches snapped. Time estimated from radar.
Jun 30, 4:23 PM EDT	TSTM WND DMG	Plainsboro Township, NJ	Multiple trees down at intersection of Schalks Crossing Road and Scudders Mill Road. Time estimated from radar.
Jun 30, 4:25 PM EDT	TSTM WND DMG	1 N Plainsboro Township, NJ	Trees and wires down at the intersection of Schalks Crossing Road and Research Way. Time estimated from radar.
Jun 30, 4:25 PM EDT	TSTM WND DMG	Plainsboro Township, NJ	Trees and wires down at the intersection of Schalks Crossing Road and Wyndhurst Drive. Time estimated from radar.

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

The nearest sounding before it

Brookhaven, NY (KOKX), launched 12:00Z, 8.1 hours before the alert went out and 170 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 1468 m above ground
0-6 km bulk shear: 22 kt
0-1 km storm-relative helicity: 37 m²/s²
0-3 km storm-relative helicity: 47 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

449 
WUUS51 KPHI 302003
SVRPHI
NJC021-023-025-035-302045-
/O.NEW.KPHI.SV.W.0111.250630T2003Z-250630T2045Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Mount Holly NJ
403 PM EDT Mon Jun 30 2025

The National Weather Service in Mount Holly NJ has issued a

* Severe Thunderstorm Warning for...
  Mercer County in central New Jersey...
  South central Somerset County in northern New Jersey...
  West central Monmouth County in central New Jersey...
  Southwestern Middlesex County in northern New Jersey...

* Until 445 PM EDT.

* At 402 PM EDT, a severe thunderstorm was located over
  Mercerville-Hamilton Square, or near Trenton, moving northeast at
  15 mph.

  HAZARD...60 mph wind gusts.

  SOURCE...Radar indicated.

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

* Locations impacted include...
  Trenton, South Brunswick, Ewing, Princeton, Jamesburg, Hightstown,
  Cranbury, Pennington, Yardley, Allentown, Roosevelt, Rocky Hill,
  Princeton Meadows, Windsor, Kingston, Dayton, Plainsboro Center,
  Belle Mead, Clearbrook Park, and White Horse.

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 4014 7461 4018 7469 4018 7471 4017 7470
      4016 7472 4017 7473 4018 7475 4022 7477
      4024 7483 4026 7484 4048 7466 4031 7433
TIME...MOT...LOC 2002Z 221DEG 13KT 4023 7468 

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

$$

Staarmann

2 follow-up statements

367 
WWUS51 KPHI 302018
SVSPHI

Severe Weather Statement
National Weather Service Mount Holly NJ
418 PM EDT Mon Jun 30 2025

NJC025-302028-
/O.CAN.KPHI.SV.W.0111.000000T0000Z-250630T2045Z/
Monmouth NJ-
418 PM EDT Mon Jun 30 2025

...THE SEVERE THUNDERSTORM WARNING FOR WEST CENTRAL MONMOUTH COUNTY
IS CANCELLED...

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

LAT...LON 4031 7436 4020 7458 4020 7466 4021 7474
      4030 7480 4048 7466 4032 7435
TIME...MOT...LOC 2018Z 213DEG 15KT 4033 7464 

$$

NJC021-023-035-302045-
/O.CON.KPHI.SV.W.0111.000000T0000Z-250630T2045Z/
Mercer NJ-Somerset NJ-Middlesex NJ-
418 PM EDT Mon Jun 30 2025

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 445 PM EDT
FOR CENTRAL MERCER...SOUTH CENTRAL SOMERSET AND SOUTHWESTERN
MIDDLESEX COUNTIES...

At 418 PM EDT, a severe thunderstorm was located over Princeton, or 9
miles northeast of Trenton, moving northeast at 15 mph.

HAZARD...60 mph wind gusts.

SOURCE...Radar indicated.

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

Locations impacted include...
Trenton, South Brunswick, Ewing, Princeton, Jamesburg, Hightstown,
Cranbury, Pennington, Rocky Hill, Princeton Meadows, Windsor,
Kingston, Dayton, Plainsboro Center, Belle Mead, Clearbrook Park,
Edinburg, Twin Rivers, Whittingham, and Kendall Park.

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 4031 7436 4020 7458 4020 7466 4021 7474
      4030 7480 4048 7466 4032 7435
TIME...MOT...LOC 2018Z 213DEG 15KT 4033 7464 

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

$$

Staarmann

821 
WWUS51 KPHI 302025
SVSPHI

Severe Weather Statement
National Weather Service Mount Holly NJ
425 PM EDT Mon Jun 30 2025

NJC021-023-035-302045-
/O.CON.KPHI.SV.W.0111.000000T0000Z-250630T2045Z/
Mercer NJ-Somerset NJ-Middlesex NJ-
425 PM EDT Mon Jun 30 2025

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 445 PM EDT
FOR CENTRAL MERCER...SOUTH CENTRAL SOMERSET AND SOUTHWESTERN
MIDDLESEX COUNTIES...

At 425 PM EDT, a severe thunderstorm was located over Plainsboro
Center, or 11 miles northeast of Trenton, moving northeast at 15 mph.

HAZARD...70 mph wind gusts and quarter size hail.

SOURCE...Radar indicated.

IMPACT...Minor damage to vehicles is possible. Expect considerable 
         tree damage. Wind damage is also likely to mobile homes, 
         roofs, and outbuildings.

Locations impacted include...
South Brunswick, Princeton, Jamesburg, Cranbury, Pennington, Rocky
Hill, Edinburg, Princeton Meadows, Kingston, Dayton, Kendall Park,
Plainsboro Center, Belle Mead, Lawrenceville, Whittingham, Princeton
Junction, Princeton North, Monmouth Junction, Heathcote, and
Rossmoor.

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 4025 7463 4026 7469 4030 7480 4048 7466
      4035 7440
TIME...MOT...LOC 2025Z 222DEG 13KT 4034 7462 

THUNDERSTORM DAMAGE THREAT...CONSIDERABLE
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.00 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
Jun 30, 2:23 AM EDT	Severe Thunderstorm Warning	PHI	Cumberland, Gloucester, Salem	52 min
Jun 30, 3:19 AM EDT	Heat Advisory	PHI	Burlington, Camden, Gloucester, Mercer	13 hr
Jun 30, 3:20 AM EDT	Small Craft Advisory	PHI		47 hr
Jun 30, 3:44 AM EDT	Special Marine Warning	PHI		61 min
Jun 30, 4:32 AM EDT	Flash Flood Warning	PHI	Atlantic, Cumberland	103 min
Jun 30, 4:42 AM EDT	Special Marine Warning	PHI		93 min
Jun 30, 5:20 AM EDT	Special Marine Warning	PHI		85 min
Jun 30, 5:37 AM EDT	Severe Thunderstorm Warning	PHI	Cape May	23 min
Jun 30, 7:51 AM EDT	Special Marine Warning	PHI		37 min
Jun 30, 12:45 PM EDT	Special Marine Warning	PHI		60 min
Jun 30, 1:28 PM EDT	Severe Thunderstorm Warning	PHI	Gloucester, Salem	47 min
Jun 30, 1:41 PM EDT	Special Marine Warning	PHI		64 min
Jun 30, 1:44 PM EDT	Severe Thunderstorm Warning	PHI	Burlington, Ocean	46 min
Jun 30, 2:19 PM EDT	Flash Flood Warning	PHI	Camden, Gloucester	4 hr
Jun 30, 2:35 PM EDT	Special Marine Warning	PHI		55 min
Jun 30, 3:14 PM EDT	Severe Thunderstorm Warning	PHI	Burlington	46 min
Jun 30, 3:52 PM EDT	Severe Thunderstorm Warning	PHI	Gloucester, Salem	38 min
Jun 30, 3:53 PM EDT	Special Marine Warning	PHI		67 min
Jun 30, 4:24 PM EDT	Severe Thunderstorm Warning Considerable damage threat	PHI	Mercer, Middlesex, Somerset	51 min

Nearby

Severe Thunderstorm Warnings in New Jersey, 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.