Alert archive / New Jersey / Severe Thunderstorm Warnings in 2026

Severe Thunderstorm Warning 200, NWS Philadelphia/Mount Holly

July 18, 20264 counties in New Jersey

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Jul 18, 2026, 6:30 PM EDT for 4 counties in New Jersey. It was in force for 45 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued
Jul 18, 2026, 6:30 PM EDT (22:30 UTC)
Expired
Jul 18, 2026, 7:15 PM EDT
In force
45 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 watch it was issued in

The SPC watch in force over the same counties when this warning went out.

IssuedProductOfficeLasted
Jul 18, 1:55 PM EDTTornado WatchSPC6 hr

The nearest sounding before it

Brookhaven, NY (KOKX), launched 12:00Z, 10.5 hours before the alert went out and 131 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-pSkew-T log-p diagram, Brookhaven, NY at 12:00Z on 2026-07-18Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 5 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Brookhaven, NY at 12:00Z on 2026-07-18The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 131 square meters per square second.193958Sfc1 km3 km6 km9 kmRMLM
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
5 J/kg
Mixed-layer CIN
-238 J/kg
Mixed-layer LCL
1076 m above ground
0-6 km bulk shear
45 kt
0-1 km storm-relative helicity
131 m²/s²
0-3 km storm-relative helicity
157 m²/s²
Significant tornado parameter
0.0
Supercell composite
1.0

Open this sounding in Storm Lab

The text

As transmitted.

129 
WUUS51 KPHI 182230
SVRPHI
NJC021-023-025-035-182315-
/O.NEW.KPHI.SV.W.0200.260718T2230Z-260718T2315Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Mount Holly NJ
630 PM EDT Sat Jul 18 2026

The National Weather Service in Mount Holly NJ has issued a

* Severe Thunderstorm Warning for...
  Central Mercer County in central New Jersey...
  Southeastern Somerset County in northern New Jersey...
  Northeastern Monmouth County in central New Jersey...
  Middlesex County in northern New Jersey...

* Until 715 PM EDT.

* At 630 PM EDT, a severe thunderstorm was located over
  Lawrenceville, or 7 miles northeast of Trenton, moving northeast at
  35 mph.

  HAZARD...60 mph wind gusts.

  SOURCE...Radar indicated.

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

* Locations impacted include...
  Trenton, New Brunswick, Perth Amboy, Somerset, Edison, Old Bridge,
  East Brunswick, South Brunswick, Sayreville, North Brunswick,
  Ewing, Carteret, Princeton, Keansburg, Matawan, Jamesburg,
  Hightstown, Cranbury, Pennington, and Hopewell.

This includes the following highways...
 New Jersey Turnpike between exits 9 and 13.
 Interstate 295 in New Jersey between mile markers 64 and 72.
 Interstate 287 in New Jersey between mile markers 0 and 5.
 Garden State Parkway between mile markers 116 and 134.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Tornado Watch remains in effect until 900 PM EDT for central,
northern and northwestern New Jersey.

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.

A Tornado Watch remains in effect until 900 PM EDT for central,
northern and northwestern New Jersey.

&&

LAT...LON 4021 7473 4037 7484 4061 7432 4059 7429
      4060 7426 4059 7420 4056 7421 4055 7425
      4050 7426 4050 7428 4046 7426 4044 7420
      4046 7418 4045 7413 4042 7406
TIME...MOT...LOC 2230Z 243DEG 32KT 4033 7470 

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

$$

MPS
2 follow-up statements
357 
WWUS51 KPHI 182252
SVSPHI

Severe Weather Statement
National Weather Service Mount Holly NJ
652 PM EDT Sat Jul 18 2026

NJC021-182302-
/O.CAN.KPHI.SV.W.0200.000000T0000Z-260718T2315Z/
Mercer NJ-
652 PM EDT Sat Jul 18 2026

...THE SEVERE THUNDERSTORM WARNING FOR CENTRAL MERCER COUNTY IS
CANCELLED...

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

A Tornado Watch remains in effect until 900 PM EDT for northern and
central New Jersey.

LAT...LON 4029 7448 4047 7462 4061 7432 4059 7429
      4060 7426 4059 7420 4056 7421 4055 7425
      4050 7426 4050 7428 4046 7426 4044 7420
      4046 7418 4045 7413 4042 7406
TIME...MOT...LOC 2252Z 245DEG 35KT 4045 7451 

$$

NJC023-025-035-182315-
/O.CON.KPHI.SV.W.0200.000000T0000Z-260718T2315Z/
Somerset NJ-Monmouth NJ-Middlesex NJ-
652 PM EDT Sat Jul 18 2026

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 715 PM EDT
FOR SOUTHEASTERN SOMERSET...NORTHEASTERN MONMOUTH AND MIDDLESEX
COUNTIES...

At 652 PM EDT, a severe thunderstorm was located over North Brunswick
Township, or near New Brunswick, moving northeast 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...
New Brunswick, Perth Amboy, Somerset, Edison, Old Bridge, East
Brunswick, South Brunswick, Sayreville, North Brunswick, Carteret,
Keansburg, Matawan, Jamesburg, Colonia, Brownville, Dayton, North
Brunswick Township, Clearbrook Park, Whittingham, and Kendall Park.

This includes the following highways...
 New Jersey Turnpike between exits 9 and 13.
 Interstate 287 in New Jersey between mile markers 0 and 5.
 Garden State Parkway between mile markers 116 and 134.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Tornado Watch remains in effect until 900 PM EDT for northern and
central New Jersey.

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.

&&

LAT...LON 4029 7448 4047 7462 4061 7432 4059 7429
      4060 7426 4059 7420 4056 7421 4055 7425
      4050 7426 4050 7428 4046 7426 4044 7420
      4046 7418 4045 7413 4042 7406
TIME...MOT...LOC 2252Z 245DEG 35KT 4045 7451 

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

$$

MPS
790 
WWUS51 KPHI 182305
SVSPHI

Severe Weather Statement
National Weather Service Mount Holly NJ
705 PM EDT Sat Jul 18 2026

NJC023-025-035-182315-
/O.EXP.KPHI.SV.W.0200.000000T0000Z-260718T2315Z/
Somerset NJ-Monmouth NJ-Middlesex NJ-
705 PM EDT Sat Jul 18 2026

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN SOMERSET...
NORTHEASTERN MONMOUTH AND MIDDLESEX COUNTIES WILL EXPIRE AT 715 PM
EDT...

The storm which prompted the warning has moved out of the area.
Therefore, the warning will be allowed to expire.  However gusty
winds and heavy rain are still possible with this thunderstorm.

A Tornado Watch remains in effect until 900 PM EDT for northern and
central New Jersey.

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 4029 7448 4047 7462 4061 7432 4059 7429
      4060 7426 4059 7420 4056 7421 4055 7425
      4050 7426 4050 7428 4046 7426 4044 7420
      4046 7418 4045 7413 4042 7406
TIME...MOT...LOC 2305Z 243DEG 32KT 4048 7443 

$$

MPS

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 18, 10:39 AM EDTSevere Thunderstorm WarningPHISussex, Warren21 min
Jul 18, 12:40 PM EDTFlash Flood WarningPHIMiddlesex, Morris, Somerset3 hr
Jul 18, 1:52 PM EDTFlash Flood WarningPHIMercer, Middlesex, Somerset4 hr
Jul 18, 2:36 PM EDTFlash Flood WarningPHIHunterdon, Mercer, Middlesex, Monmouth4 hr
Jul 18, 3:13 PM EDTSevere Thunderstorm WarningPHIBurlington, Mercer, Middlesex, Monmouth, Ocean47 min
Jul 18, 3:14 PM EDTFlash Flood Warning Considerable damage threatPHIMercer4 hr
Jul 18, 3:16 PM EDTSpecial Marine WarningPHI59 min
Jul 18, 3:30 PM EDTSevere Thunderstorm WarningPHIBurlington, Camden45 min
Jul 18, 3:31 PM EDTSevere Thunderstorm WarningPHIBurlington, Monmouth, Ocean44 min
Jul 18, 3:36 PM EDTSevere Thunderstorm WarningPHIBurlington, Camden, Gloucester39 min
Jul 18, 3:44 PM EDTFlash Flood WarningPHIMiddlesex, Monmouth, Ocean4 hr
Jul 18, 4:02 PM EDTSpecial Marine WarningPHI118 min
Jul 18, 4:03 PM EDTSevere Thunderstorm WarningPHIBurlington, Ocean42 min
Jul 18, 4:34 PM EDTFlash Flood WarningPHIOcean4 hr
Jul 18, 4:46 PM EDTFlash Flood WarningPHIOcean4 hr
Jul 18, 5:14 PM EDTSevere Thunderstorm WarningPHICumberland, Salem61 min
Jul 18, 5:16 PM EDTSpecial Marine WarningPHI89 min
Jul 18, 5:47 PM EDTSpecial Marine WarningPHI118 min
Jul 18, 5:49 PM EDTSevere Thunderstorm WarningPHIMonmouth, Ocean41 min
Jul 18, 6:30 PM EDTSpecial Marine WarningPHI2 hr
Jul 18, 6:55 PM EDTAreal Flood WarningPHIMonmouth4 hr
Jul 18, 6:56 PM EDTSpecial Marine WarningPHI64 min
Jul 18, 7:13 PM EDTSevere Thunderstorm WarningPHICape May32 min
Jul 18, 7:47 PM EDTAreal Flood WarningPHIMonmouth, Ocean4 hr

Nearby

Severe Thunderstorm Warnings in New Jersey, 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; the sounding from the Mesonet's radiosonde archive.