Alert archive / New Jersey / Severe Thunderstorm Warnings in 2023

Severe Thunderstorm Warning 183, NWS Philadelphia/Mount Holly

July 9, 2023Camden County, Gloucester County, Salem County, New Jersey; Philadelphia County, Pennsylvania

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Jul 9, 2023, 5:35 PM EDT for Camden County, Gloucester County, Salem County, New Jersey; Philadelphia County, Pennsylvania. It was in force for 25 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 9, 2023, 5:35 PM EDT (21:35 UTC)
Expired
Jul 9, 2023, 6:00 PM EDT
In force
25 min
Issued by
NWS Philadelphia/Mount Holly
Area
Storm-based polygon
Tornado
Possible
Hail
0.75 in
Wind
60.0 mph

Counties Camden County, NJ, Gloucester County, NJ, Salem County, NJ, Philadelphia County, PA

The radar

The Philadelphia radar (KDIX), 72 km from the middle of the area, began a volume at 21:36 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.

The watch it was issued in

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

IssuedProductOfficeLasted
Jul 9, 11:06 AM EDTSevere Thunderstorm WatchSPC9 hr

The nearest sounding before it

Wallops Is Stn, VA (KWAL), launched 12:00Z, 9.6 hours before the alert went out and 207 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 2023-07-09Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1082 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 2023-07-09The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 24 square meters per square second.1939Sfc1 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
1082 J/kg
Mixed-layer CIN
-5 J/kg
Mixed-layer LCL
603 m above ground
0-6 km bulk shear
21 kt
0-1 km storm-relative helicity
24 m²/s²
0-3 km storm-relative helicity
48 m²/s²
Significant tornado parameter
0.1
Supercell composite
0.9

Open this sounding in Storm Lab

The text

As transmitted.

992 
WUUS51 KPHI 092135
SVRPHI
NJC007-015-033-PAC101-092200-
/O.NEW.KPHI.SV.W.0183.230709T2135Z-230709T2200Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Mount Holly NJ
535 PM EDT Sun Jul 9 2023

The National Weather Service in Mount Holly NJ has issued a

* Severe Thunderstorm Warning for...
  North central Salem County in southern New Jersey...
  West central Camden County in southern New Jersey...
  Northwestern Gloucester County in southern New Jersey...
  South central Philadelphia County in southeastern Pennsylvania...

* Until 600 PM EDT.

* At 535 PM EDT, a severe thunderstorm was located over Swedesboro,
  or 13 miles east of Wilmington, 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...
  Philadelphia, Camden, Gloucester City, Deptford, West Deptford,
  Glassboro, Lindenwold, Bellmawr, Woodbury, Pitman, Paulsboro,
  Westville, Woodstown, Woodbury Heights, National Park, Swedesboro,
  Brooklawn, Audubon Park, Beckett and Mullica Hill.

This includes the following highways...
 New Jersey Turnpike between exits 2 and 3.
 Interstate 95 in Pennsylvania between mile markers 17 and 18.
 Interstate 76 in Pennsylvania near mile marker 351.
 Interstate 76 in New Jersey between mile markers 0 and 3.
 Interstate 295 in New Jersey between mile markers 8 and 29.
 Interstate 676 in New Jersey between mile markers 0 and 2.
 Atlantic City Expressway between mile markers 40 and 44.

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.

&&

LAT...LON 3963 7531 3977 7542 3985 7526 3986 7522
      3988 7521 3993 7511 3974 7496
TIME...MOT...LOC 2135Z 235DEG 32KT 3975 7528 

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

$$

MLB
1 follow-up statement
717 
WWUS51 KPHI 092155
SVSPHI

Severe Weather Statement
National Weather Service Mount Holly NJ
555 PM EDT Sun Jul 9 2023

NJC007-015-033-PAC101-092205-
/O.EXP.KPHI.SV.W.0183.000000T0000Z-230709T2200Z/
Salem NJ-Camden NJ-Gloucester NJ-Philadelphia PA-
555 PM EDT Sun Jul 9 2023

...THE SEVERE THUNDERSTORM WARNING FOR NORTH CENTRAL SALEM...WEST
CENTRAL CAMDEN...NORTHWESTERN GLOUCESTER AND SOUTH CENTRAL
PHILADELPHIA COUNTIES WILL EXPIRE AT 600 PM EDT...
                
The storm which prompted the warning has weakened below severe
limits, and no longer poses an immediate threat to life or property.
Therefore, the warning will be allowed to expire.  However gusty
winds and heavy rain are still possible with this thunderstorm.

A Severe Thunderstorm Watch remains in effect until 800 PM EDT for
southern New Jersey...and southeastern Pennsylvania.

LAT...LON 3963 7531 3977 7542 3985 7526 3986 7522
      3988 7521 3993 7511 3974 7496
TIME...MOT...LOC 2155Z 235DEG 32KT 3984 7511 

$$

Staarmann

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 9, 12:37 PM EDTAreal Flood AdvisoryPHIHunterdon, Warren2 hr
Jul 9, 1:02 PM EDTFlash Flood WarningPHIHunterdon, Warren8 hr
Jul 9, 1:57 PM EDTAreal Flood AdvisoryPHIMorris, Sussex, Warren65 min
Jul 9, 2:05 PM EDTFlash Flood WarningPHISussex6 hr
Jul 9, 2:30 PM EDTAreal Flood AdvisoryPHIHunterdon, Morris, Warren4 min
Jul 9, 2:34 PM EDTFlash Flood WarningPHIHunterdon, Morris, Somerset, Warren6 hr
Jul 9, 2:59 PM EDTSpecial Weather StatementPHISomerset31 min
Jul 9, 3:00 PM EDTFlash Flood WarningPHIMorris, Somerset, Sussex, Warren6 hr
Jul 9, 4:12 PM EDTSpecial Weather StatementPHISomerset33 min
Jul 9, 4:34 PM EDTSpecial Marine WarningPHI86 min
Jul 9, 4:57 PM EDTSpecial Marine WarningPHI93 min
Jul 9, 4:58 PM EDTSpecial Weather StatementPHICumberland, Salem47 min
Jul 9, 5:09 PM EDTFlash Flood WarningPHISalem4 hr
Jul 9, 5:10 PM EDTSevere Thunderstorm WarningPHIGloucester, Salem50 min
Jul 9, 5:15 PM EDTSpecial Weather StatementPHIHunterdon, Warren30 min
Jul 9, 5:49 PM EDTSpecial Weather StatementPHICumberland26 min
Jul 9, 5:59 PM EDTFlash Flood WarningPHIHunterdon, Mercer4 hr
Jul 9, 5:59 PM EDTSpecial Weather StatementPHICape May46 min
Jul 9, 6:33 PM EDTSpecial Marine WarningPHI87 min
Jul 9, 6:52 PM EDTFlash Flood WarningPHIHunterdon, Mercer, Middlesex, Morris, Somerset4 hr
Jul 9, 7:11 PM EDTAreal Flood AdvisoryPHIBurlington, Camden, Gloucester, Mercer, Salem3 hr
Jul 9, 7:16 PM EDTSpecial Weather StatementPHIBurlington29 min
Jul 9, 7:21 PM EDTSpecial Marine WarningPHI114 min
Jul 9, 7:29 PM EDTRiver Flood WarningPHIHunterdon, Somerset10 hr
Jul 9, 11:00 AM EDTSpecial Weather StatementPHICarbon30 min
Jul 9, 11:33 AM EDTFlash Flood WarningPHIChester, Delaware, Montgomery8 hr
Jul 9, 11:47 AM EDTSpecial Weather StatementPHIMonroe43 min
Jul 9, 11:49 AM EDTSpecial Weather StatementPHIMontgomery41 min
Jul 9, 11:54 AM EDTAreal Flood AdvisoryPHIBerks, Bucks, Lehigh, Montgomery33 min
Jul 9, 12:14 PM EDTSpecial Weather StatementPHIBucks46 min
Jul 9, 12:15 PM EDTSpecial Weather StatementPHIMonroe30 min
Jul 9, 12:22 PM EDTSpecial Weather StatementPHILebanon38 min
Jul 9, 12:27 PM EDTFlash Flood WarningPHIBerks, Bucks, Lehigh, Montgomery8 hr
Jul 9, 12:43 PM EDTAreal Flood AdvisoryPHIBerks33 min
Jul 9, 12:51 PM EDTSpecial Weather StatementPHINorthampton24 min
Jul 9, 12:57 PM EDTAreal Flood AdvisoryPHICarbon, Monroe6 hr
Jul 9, 1:16 PM EDTFlash Flood WarningPHIBerks6 hr
Jul 9, 1:17 PM EDTSpecial Weather StatementPHIBerks28 min
Jul 9, 1:32 PM EDTAreal Flood AdvisoryPHICarbon, Lehigh, Monroe, Northampton4 hr
Jul 9, 2:16 PM EDTAreal Flood AdvisoryPHIBerks, Lehigh30 min
Jul 9, 2:41 PM EDTFlash Flood WarningPHIBerks4 hr
Jul 9, 2:46 PM EDTFlash Flood WarningPHIBerks, Lehigh, Northampton6 hr
Jul 9, 3:01 PM EDTSpecial Weather StatementPHIBerks29 min
Jul 9, 3:03 PM EDTSpecial Weather StatementPHIChester27 min
Jul 9, 3:15 PM EDTSevere Thunderstorm WarningPHIBerks30 min
Jul 9, 3:20 PM EDTSpecial Weather StatementPHIBerks25 min
Jul 9, 3:27 PM EDTSevere Thunderstorm WarningPHIBerks, Chester33 min
Jul 9, 3:41 PM EDTSpecial Weather StatementPHIBerks34 min
Jul 9, 3:51 PM EDTFlash Flood Warning Considerable damage threatPHIBerks, Chester, Lehigh, Montgomery6 hr
Jul 9, 3:59 PM EDTSpecial Weather StatementPHIChester31 min
Jul 9, 4:03 PM EDTSevere Thunderstorm WarningPHIMontgomery27 min
Jul 9, 4:19 PM EDTSpecial Weather StatementPHIChester26 min
Jul 9, 4:31 PM EDTFlash Flood WarningPHIChester, Montgomery4 hr
Jul 9, 5:12 PM EDTFlash Flood WarningPHIBucks, Montgomery5 hr
Jul 9, 5:31 PM EDTFlash Flood WarningPHIChester, Delaware, Montgomery, Philadelphia4 hr
Jul 9, 6:05 PM EDTSpecial Weather StatementPHIBucks25 min
Jul 9, 7:04 PM EDTAreal Flood WarningPHIBerks9 hr
Jul 9, 7:27 PM EDTRiver Flood WarningPHIChester4 hr

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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.