Alert archive / New Jersey / Severe Thunderstorm Warnings in 2023

Severe Thunderstorm Warning 264, NWS Philadelphia/Mount Holly

July 29, 20235 counties in New Jersey; Bucks County, Pennsylvania

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Jul 29, 2023, 6:41 PM EDT for 5 counties in New Jersey; Bucks County, Pennsylvania. It was in force for 49 min. 5 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
Jul 29, 2023, 6:41 PM EDT (22:41 UTC)
Expired
Jul 29, 2023, 7:30 PM EDT
In force
49 min
Issued by
NWS Philadelphia/Mount Holly
Area
Storm-based polygon
Hail
0.75 in
Wind
60.0 mph

Counties Hunterdon County, NJ, Mercer County, NJ, Middlesex County, NJ, Monmouth County, NJ, Somerset County, NJ, Bucks County, PA

The radar

The Philadelphia radar (KDIX), 45 km from the middle of the area, began a volume at 22:42 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

TimeReportWhereRemark
Jul 29, 6:45 PM EDTTSTM WND DMGLambertville, NJReports of trees and wires down in Lambertville. Time estimated from radar.
Jul 29, 6:46 PM EDTTSTM WND DMG2 E Montgomery Twp, NJTree down on Catskill Court in Montgomery Township. Time estimated from radar.
Jul 29, 7:02 PM EDTTSTM WND DMGHopewell, NJReport of 1 tree down that emergency responders had to reroute around.
Jul 29, 7:05 PM EDTTSTM WND DMGHopewell, NJTree down blocking Columbia Avenue. Several other large limbs down in the area. Pictures via social media.
Jul 29, 7:12 PM EDTTSTM WND DMGOld Bridge, NJWidespread tree debris with a few large limbs down on roads.

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.

IssuedProductOfficeLasted
Jul 29, 2:48 PM EDTSevere Thunderstorm WatchSPC6 hr

The nearest sounding before it

Brookhaven, NY (KOKX), launched 12:00Z, 10.7 hours before the alert went out and 151 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 2023-07-29Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 90 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 2023-07-29The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 97 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
90 J/kg
Mixed-layer CIN
-101 J/kg
Mixed-layer LCL
1183 m above ground
0-6 km bulk shear
33 kt
0-1 km storm-relative helicity
97 m²/s²
0-3 km storm-relative helicity
118 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.6

Open this sounding in Storm Lab

The text

As transmitted.

581 
WUUS51 KPHI 292241
SVRPHI
NJC019-021-023-025-035-PAC017-292330-
/O.NEW.KPHI.SV.W.0264.230729T2241Z-230729T2330Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Mount Holly NJ
641 PM EDT Sat Jul 29 2023

The National Weather Service in Mount Holly NJ has issued a

* Severe Thunderstorm Warning for...
  Southeastern Hunterdon County in northwestern New Jersey...
  Mercer County in central New Jersey...
  Southern Somerset County in northern New Jersey...
  Central Monmouth County in central New Jersey...
  Middlesex County in northern New Jersey...
  Central Bucks County in southeastern Pennsylvania...

* Until 730 PM EDT.

* At 641 PM EDT, severe thunderstorms were located along a line
  extending from Flagtown to Princeton to Doylestown, moving east at
  40 mph.

  HAZARD...60 mph wind gusts and penny size hail.

  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,
  Marlboro, Manalapan, Ewing, Holmdel, Princeton, Manville, Matawan,
  Doylestown, Byram and Jamesburg.

This includes the following highways...
 New Jersey Turnpike between exits 8 and 11.
 Interstate 195 in New Jersey between mile markers 0 and 12.
 Interstate 295 in New Jersey between mile markers 60 and 76.
 Interstate 287 in New Jersey near mile marker 1, and between mile
markers 10 and 11.
 Garden State Parkway between mile markers 113 and 128.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4017 7450 4017 7468 4018 7471 4017 7471
      4017 7493 4030 7529 4057 7483 4052 7426
      4050 7426 4050 7428 4047 7427 4044 7420
      4046 7418 4037 7411
TIME...MOT...LOC 2241Z 267DEG 35KT 4053 7465 4037 7465 4029 7515 

HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...0.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

MLB
2 follow-up statements
965 
WWUS51 KPHI 292302
SVSPHI

Severe Weather Statement
National Weather Service Mount Holly NJ
702 PM EDT Sat Jul 29 2023

NJC019-021-023-025-035-PAC017-292330-
/O.CON.KPHI.SV.W.0264.000000T0000Z-230729T2330Z/
Hunterdon NJ-Mercer NJ-Somerset NJ-Monmouth NJ-Middlesex NJ-Bucks PA-
702 PM EDT Sat Jul 29 2023

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 730 PM EDT
FOR SOUTHEASTERN HUNTERDON...MERCER...SOUTHERN SOMERSET...CENTRAL
MONMOUTH...MIDDLESEX AND SOUTHEASTERN BUCKS COUNTIES...

At 701 PM EDT, severe thunderstorms were located along a line
extending from near Edison to near Jamesburg to near Washington
Crossing, moving east 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...
Trenton, New Brunswick, Perth Amboy, Somerset, Edison, Old Bridge,
East Brunswick, South Brunswick, Sayreville, North Brunswick,
Marlboro, Manalapan, Ewing, Holmdel, Princeton, Manville, Matawan,
Jamesburg, Hightstown and Cranbury.

This includes the following highways...
 New Jersey Turnpike between exits 8 and 11.
 Interstate 195 in New Jersey between mile markers 0 and 12.
 Interstate 295 in New Jersey between mile markers 60 and 76.
 Interstate 287 in New Jersey near mile marker 1, and between mile
markers 10 and 11.
 Garden State Parkway between mile markers 113 and 128.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4017 7450 4017 7468 4018 7471 4017 7471
      4017 7493 4024 7511 4056 7472 4052 7426
      4050 7426 4050 7428 4047 7427 4044 7420
      4046 7418 4037 7411
TIME...MOT...LOC 2301Z 267DEG 35KT 4054 7441 4038 7441 4030 7491 

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

$$

MLB
947 
WWUS51 KPHI 292323
SVSPHI

Severe Weather Statement
National Weather Service Mount Holly NJ
723 PM EDT Sat Jul 29 2023

NJC019-292332-
/O.CAN.KPHI.SV.W.0264.000000T0000Z-230729T2330Z/
Hunterdon NJ-
723 PM EDT Sat Jul 29 2023

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN HUNTERDON COUNTY
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 900 PM EDT for
southern, central and northern New Jersey...and southeastern
Pennsylvania.

LAT...LON 4017 7453 4017 7468 4018 7471 4017 7471
      4017 7486 4052 7460 4052 7426 4050 7426
      4050 7428 4047 7427 4044 7420 4046 7418
      4037 7411
TIME...MOT...LOC 2322Z 267DEG 35KT 4055 7415 4039 7415 4031 7465 

$$

NJC021-023-025-035-PAC017-292330-
/O.CON.KPHI.SV.W.0264.000000T0000Z-230729T2330Z/
Mercer NJ-Somerset NJ-Monmouth NJ-Middlesex NJ-Bucks PA-
723 PM EDT Sat Jul 29 2023

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 730 PM EDT
FOR MERCER...SOUTHEASTERN SOMERSET...CENTRAL MONMOUTH...MIDDLESEX AND
SOUTHEASTERN BUCKS COUNTIES...

At 722 PM EDT, severe thunderstorms were located along a line
extending from Huguenot to Middletown to near Princeton, moving east
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...
Trenton, New Brunswick, Perth Amboy, Somerset, Old Bridge, East
Brunswick, South Brunswick, Sayreville, North Brunswick, Marlboro,
Manalapan, Ewing, Holmdel, Princeton, Matawan, Jamesburg, Hightstown,
Cranbury, Allentown and Roosevelt.

This includes the following highways...
 New Jersey Turnpike between exits 8 and 10.
 Interstate 195 in New Jersey between mile markers 0 and 11.
 Interstate 295 in New Jersey between mile markers 60 and 71.
 Garden State Parkway between mile markers 113 and 128.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4017 7453 4017 7468 4018 7471 4017 7471
      4017 7486 4052 7460 4052 7426 4050 7426
      4050 7428 4047 7427 4044 7420 4046 7418
      4037 7411
TIME...MOT...LOC 2322Z 267DEG 35KT 4055 7415 4039 7415 4031 7465 

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

$$

MLB

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 28, 8:04 PM EDTSevere Thunderstorm WarningPHISalem41 min
Jul 28, 8:33 PM EDTSpecial Weather StatementPHICumberland, Gloucester, Salem42 min
Jul 28, 8:36 PM EDTSpecial Marine WarningPHI54 min
Jul 28, 9:02 PM EDTSpecial Weather StatementPHICamden43 min
Jul 28, 9:18 PM EDTSpecial Weather StatementPHICape May, Cumberland, Salem42 min
Jul 28, 9:32 PM EDTSpecial Marine WarningPHI58 min
Jul 28, 9:44 PM EDTSpecial Weather StatementPHIBurlington, Camden, Mercer, Middlesex61 min
Jul 28, 10:00 PM EDTSpecial Weather StatementPHIAtlantic, Cape May45 min
Jul 28, 10:28 PM EDTSpecial Marine WarningPHI62 min
Jul 28, 10:54 PM EDTSpecial Weather StatementPHICumberland, Salem36 min
Jul 28, 11:15 PM EDTSpecial Weather StatementPHICape May30 min
Jul 28, 11:26 PM EDTSpecial Marine WarningPHI94 min
Jul 29, 12:43 AM EDTSevere Thunderstorm WarningPHIAtlantic, Cape May, Cumberland47 min
Jul 29, 12:55 AM EDTSpecial Marine WarningPHI65 min
Jul 29, 4:55 PM EDTSevere Thunderstorm WarningPHICumberland, Gloucester, Salem50 min
Jul 29, 5:05 PM EDTSpecial Marine WarningPHI85 min
Jul 29, 5:38 PM EDTSevere Thunderstorm WarningPHIAtlantic, Camden, Cumberland, Gloucester, Salem52 min
Jul 29, 5:44 PM EDTSevere Thunderstorm Warning Considerable damage threatPHISalem46 min
Jul 29, 5:51 PM EDTSpecial Marine WarningPHI114 min
Jul 29, 6:07 PM EDTSevere Thunderstorm WarningPHIAtlantic, Cape May, Cumberland, Salem68 min
Jul 29, 6:13 PM EDTSpecial Weather StatementPHIMorris, Sussex32 min
Jul 29, 6:13 PM EDTSevere Thunderstorm WarningPHIHunterdon, Mercer, Middlesex, Monmouth, Somerset47 min
Jul 29, 6:26 PM EDTSevere Thunderstorm WarningPHIBurlington, Camden, Gloucester, Salem49 min
Jul 29, 6:28 PM EDTSevere Thunderstorm WarningPHIAtlantic, Burlington, Camden, Ocean47 min
Jul 29, 6:33 PM EDTSevere Thunderstorm WarningPHICape May42 min
Jul 29, 6:46 PM EDTSevere Thunderstorm WarningPHIBurlington, Camden, Gloucester44 min
Jul 29, 6:51 PM EDTSpecial Marine WarningPHI54 min
Jul 29, 7:19 PM EDTSpecial Marine WarningPHI56 min
Jul 29, 7:19 PM EDTSevere Thunderstorm WarningPHIMonmouth26 min
Jul 29, 7:35 PM EDTSpecial Weather StatementPHIMonmouth70 min
Jul 29, 7:53 PM EDTSpecial Marine WarningPHI97 min
Jul 29, 7:54 PM EDTSevere Thunderstorm WarningPHIBurlington, Monmouth, Ocean40 min
Jul 28, 8:24 PM EDTSpecial Weather StatementPHIDelaware, Montgomery51 min
Jul 29, 6:36 PM EDTSpecial Weather StatementPHIChester, Delaware24 min

Nearby

Severe Thunderstorm Warnings in New Jersey, 2023Severe Thunderstorm Warnings in Pennsylvania, 2023Every severe thunderstorm warning in 2023

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.