Alert archive / New Jersey / Severe Thunderstorm Warnings in 2023

Severe Thunderstorm Warning 263, NWS Philadelphia/Mount Holly

July 29, 2023Cape May County, New Jersey

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Jul 29, 2023, 6:33 PM EDT for Cape May County, New Jersey. It was in force for 42 min. 6 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, 6:33 PM EDT (22:33 UTC)
Expired
Jul 29, 2023, 7:15 PM EDT
In force
42 min
Issued by
NWS Philadelphia/Mount Holly
Area
Storm-based polygon
Hail
0.75 in
Wind
60.0 mph

County Cape May County, NJ

The radar

The Dover AFB radar (KDOX), 60 km from the middle of the area, began a volume at 22:32 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 GST 40Dennis Twp Njwxnet, NJNJWxNet gauge at Dennis Twp.
Jul 29, 6:54 PM EDTTSTM WND GST 481 Ssw North Cape May, NJUSGS gauge at Cape May Ferry.
Jul 29, 6:54 PM EDTTSTM WND GST 481 Ssw North Cape May, NJUSGS gauge at Cape May Ferry.
Jul 29, 6:55 PM EDTTSTM WND GST 452 Se Woodbine, NJMesonet station NJ55 Woodbine.
Jul 29, 6:55 PM EDTTSTM WND GST 452 Se Woodbine, NJNJWxNet gauge at Woodbine.
Jul 29, 6:57 PM EDTTSTM WND DMGSeaville, NJTrees and wires down on East Katherine Avenue in Upper Township. 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.

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

The nearest sounding before it

Wallops Is Stn, VA (KWAL), launched 12:00Z, 10.6 hours before the alert went out and 140 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, Wallops Is Stn, VA at 12:00Z on 2023-07-29Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 245 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Wallops Is Stn, VA at 12:00Z on 2023-07-29The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 179 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
245 J/kg
Mixed-layer CIN
-215 J/kg
Mixed-layer LCL
1190 m above ground
0-6 km bulk shear
32 kt
0-1 km storm-relative helicity
179 m²/s²
0-3 km storm-relative helicity
159 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.3

Open this sounding in Storm Lab

The text

As transmitted.

497 
WUUS51 KPHI 292233
SVRPHI
NJC009-292315-
/O.NEW.KPHI.SV.W.0263.230729T2233Z-230729T2315Z/

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

The National Weather Service in Mount Holly NJ has issued a

* Severe Thunderstorm Warning for...
  Cape May County in southern New Jersey...

* Until 715 PM EDT.

* At 633 PM EDT, severe thunderstorms were located along a line
  extending from near Bivalve to 11 miles northwest of North Cape May
  to near Big Stone Beach, moving east at 45 mph.

  HAZARD...60 mph wind gusts.

  SOURCE...Radar indicated.

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

* Locations impacted include...
  Ocean City, Cape May, North Wildwood, Wildwood Crest, Woodbine, Sea
  Isle City, Avalon, West Cape May, Stone Harbor, Cape May Court
  House, Scotch Bonnet, Seaville, Diamond Beach, Green Creek,
  Dennisville, Goshen, Strathmere, Rio Grande, North Cape May and
  Belleplain Forest.

This includes Garden State Parkway between mile markers 0 and 23.
 
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.

&&

LAT...LON 3927 7488 3923 7461 3910 7467 3892 7484
      3891 7498 3900 7499 3916 7491
TIME...MOT...LOC 2233Z 282DEG 38KT 3919 7510 3907 7513 3895 7526 

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

$$

Staarmann
1 follow-up statement
802 
WWUS51 KPHI 292253
SVSPHI

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

NJC009-292315-
/O.CON.KPHI.SV.W.0263.000000T0000Z-230729T2315Z/
Cape May NJ-
653 PM EDT Sat Jul 29 2023

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 715 PM EDT
FOR CAPE MAY COUNTY...

At 653 PM EDT, severe thunderstorms were located along a line
extending from Dennisville to Rio Grande to near West Cape May,
moving east at 45 mph.

HAZARD...60 mph wind gusts.

SOURCE...Radar indicated.

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

Locations impacted include...
Ocean City, Cape May, North Wildwood, Wildwood Crest, Woodbine, Sea
Isle City, Avalon, West Cape May, Stone Harbor, Cape May Court House,
Scotch Bonnet, Seaville, Diamond Beach, Green Creek, Dennisville,
Goshen, Strathmere, Rio Grande, North Cape May and Belleplain Forest.

This includes Garden State Parkway between mile markers 0 and 23.
 
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, and
the storm will affect the beaches. For your safety, immediately move
off the beach and seek shelter indoors.

&&

LAT...LON 3927 7488 3923 7461 3910 7467 3892 7484
      3891 7498 3900 7499 3916 7491
TIME...MOT...LOC 2253Z 281DEG 38KT 3921 7481 3903 7489 3891 7499 

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

$$

Staarmann

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, 6:41 PM EDTSevere Thunderstorm WarningPHIHunterdon, Mercer, Middlesex, Monmouth, Somerset49 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

Nearby

Severe Thunderstorm Warnings in New Jersey, 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.