Alert archive / New Jersey / Severe Thunderstorm Warnings in 2023
Severe Thunderstorm Warning 351, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Sep 9, 2023, 3:34 PM EDT for Delaware County, Philadelphia County, Pennsylvania; Burlington County, Camden County, Gloucester County, New Jersey. It was in force for 56 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
- Sep 9, 2023, 3:34 PM EDT (19:34 UTC)
- Expired
- Sep 9, 2023, 4:30 PM EDT
- In force
- 56 min
- Issued by
- NWS Philadelphia/Mount Holly
- Area
- Storm-based polygon
- Hail
- 1.0 in
- Wind
- 60.0 mph
Counties Burlington County, NJ, Camden County, NJ, Gloucester County, NJ, Delaware County, PA, Philadelphia County, PA
The radar
The Philadelphia radar (KDIX), 59 km from the middle of the area, began a volume at 19:36 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.
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| Sep 9, 3:40 PM EDT | TSTM WND GST 50 | Hi-Nella, NJ | |
| Sep 9, 3:40 PM EDT | HAIL 0.25 | Hi-Nella, NJ | |
| Sep 9, 3:46 PM EDT | HAIL 1 | 1 N Gloucester Twp, NJ | |
| Sep 9, 3:59 PM EDT | TSTM WND GST 35 | Philadelphia Internatio, PA | ASOS station KPHL Philadelphia International Airport. |
| Sep 9, 4:00 PM EDT | TSTM WND GST 42 | 1 Wnw Westville, NJ | Mesonet station NJ68 West Deptford. |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
The nearest sounding before it
Wallops Is Stn, VA (KWAL), launched 12:00Z, 7.6 hours before the alert went out and 217 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.
- Mixed-layer CAPE
- 1782 J/kg
- Mixed-layer CIN
- -14 J/kg
- Mixed-layer LCL
- 820 m above ground
- 0-6 km bulk shear
- 12 kt
- 0-1 km storm-relative helicity
- -10 m²/s²
- 0-3 km storm-relative helicity
- 12 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
265
WUUS51 KPHI 091934
SVRPHI
NJC005-007-015-PAC045-101-092030-
/O.NEW.KPHI.SV.W.0351.230909T1934Z-230909T2030Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Mount Holly NJ
334 PM EDT Sat Sep 9 2023
The National Weather Service in Mount Holly NJ has issued a
* Severe Thunderstorm Warning for...
Northwestern Camden County in southern New Jersey...
North central Gloucester County in southern New Jersey...
West central Burlington County in southern New Jersey...
Philadelphia County in southeastern Pennsylvania...
East central Delaware County in southeastern Pennsylvania...
* Until 430 PM EDT.
* At 334 PM EDT, a severe thunderstorm was located over Magnolia, or
near Gloucester City, moving northwest at 10 mph.
HAZARD...60 mph wind gusts and quarter size hail.
SOURCE...Radar indicated.
IMPACT...Minor damage to vehicles is possible. Wind damage to
roofs, siding, trees, and power lines is possible.
* Locations impacted include...
Philadelphia, Camden, Gloucester City, Cherry Hill, Deptford,
Voorhees, West Deptford, Lindenwold, Bellmawr, Yeadon, Woodbury,
Berlin, Palmyra, Folcroft, Paulsboro, Magnolia, Westville, Woodbury
Heights, National Park and East Lansdowne.
This includes the following highways...
New Jersey Turnpike near exit 3.
Interstate 95 in Pennsylvania between mile markers 12 and 31.
Interstate 76 in Pennsylvania between mile markers 340 and 351.
Interstate 76 in New Jersey between mile markers 0 and 3.
Interstate 295 in New Jersey between mile markers 21 and 37.
Interstate 676 in Pennsylvania between mile markers 0 and 1.
Interstate 676 in New Jersey between mile markers 0 and 4.
Atlantic City Expressway between mile markers 43 and 44.
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 3973 7510 3995 7533 4009 7502 3982 7491
TIME...MOT...LOC 1934Z 150DEG 9KT 3985 7505
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.00 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH
$$
Staarmann3 follow-up statements
236
WWUS51 KPHI 091949
SVSPHI
Severe Weather Statement
National Weather Service Mount Holly NJ
349 PM EDT Sat Sep 9 2023
NJC005-007-015-PAC045-101-092030-
/O.CON.KPHI.SV.W.0351.000000T0000Z-230909T2030Z/
Camden NJ-Gloucester NJ-Burlington NJ-Philadelphia PA-Delaware PA-
349 PM EDT Sat Sep 9 2023
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 430 PM EDT
FOR NORTHWESTERN CAMDEN...NORTH CENTRAL GLOUCESTER...WEST CENTRAL
BURLINGTON...PHILADELPHIA AND EAST CENTRAL DELAWARE COUNTIES...
At 348 PM EDT, quarter sized hail was reported in Somerdale. This
severe thunderstorm is now located over Magnolia, or near Gloucester
City, moving northwest at 10 mph.
HAZARD...60 mph wind gusts and quarter size hail.
SOURCE...Trained weather spotters.
IMPACT...Minor damage to vehicles is possible. Wind damage to roofs,
siding, trees, and power lines is possible.
Locations impacted include...
Philadelphia, Camden, Gloucester City, Cherry Hill, Deptford,
Voorhees, West Deptford, Lindenwold, Bellmawr, Yeadon, Woodbury,
Berlin, Palmyra, Folcroft, Paulsboro, Magnolia, Westville, Woodbury
Heights, National Park and East Lansdowne.
This includes the following highways...
New Jersey Turnpike near exit 3.
Interstate 95 in Pennsylvania between mile markers 12 and 31.
Interstate 76 in Pennsylvania between mile markers 340 and 351.
Interstate 76 in New Jersey between mile markers 0 and 3.
Interstate 295 in New Jersey between mile markers 21 and 37.
Interstate 676 in Pennsylvania between mile markers 0 and 1.
Interstate 676 in New Jersey between mile markers 0 and 4.
Atlantic City Expressway between mile markers 43 and 44.
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 3973 7510 3995 7533 4009 7502 3982 7491
TIME...MOT...LOC 1948Z 151DEG 9KT 3987 7506
HAIL THREAT...OBSERVED
MAX HAIL SIZE...1.00 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH
$$
Staarmann074
WWUS51 KPHI 091955
SVSPHI
Severe Weather Statement
National Weather Service Mount Holly NJ
355 PM EDT Sat Sep 9 2023
NJC005-007-015-PAC045-101-092030-
/O.CON.KPHI.SV.W.0351.000000T0000Z-230909T2030Z/
Camden NJ-Gloucester NJ-Burlington NJ-Philadelphia PA-Delaware PA-
355 PM EDT Sat Sep 9 2023
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 430 PM EDT
FOR NORTHWESTERN CAMDEN...NORTH CENTRAL GLOUCESTER...WEST CENTRAL
BURLINGTON...PHILADELPHIA AND EAST CENTRAL DELAWARE COUNTIES...
At 354 PM EDT, a severe thunderstorm was located over Audubon Park,
or over Gloucester City, moving northwest at 10 mph. This storm has
a history of producing quarter sized hail near Somerdale.
HAZARD...Ping pong ball size hail and 60 mph wind gusts.
SOURCE...Trained weather spotters.
IMPACT...People and animals outdoors will be injured. Expect hail
damage to roofs, siding, windows, and vehicles. Wind damage
to roofs, siding, trees, and power lines is possible.
Locations impacted include...
Philadelphia, Camden, Gloucester City, Cherry Hill, Deptford,
Voorhees, West Deptford, Lindenwold, Bellmawr, Yeadon, Woodbury,
Berlin, Palmyra, Folcroft, Paulsboro, Magnolia, Westville, Woodbury
Heights, National Park and East Lansdowne.
This includes the following highways...
New Jersey Turnpike near exit 3.
Interstate 95 in Pennsylvania between mile markers 12 and 31.
Interstate 76 in Pennsylvania between mile markers 340 and 351.
Interstate 76 in New Jersey between mile markers 0 and 3.
Interstate 295 in New Jersey between mile markers 21 and 37.
Interstate 676 in Pennsylvania between mile markers 0 and 1.
Interstate 676 in New Jersey between mile markers 0 and 4.
Atlantic City Expressway near mile marker 44.
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 3974 7511 3995 7533 4009 7502 3982 7491
TIME...MOT...LOC 1954Z 150DEG 9KT 3988 7507
HAIL THREAT...OBSERVED
MAX HAIL SIZE...1.50 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH
$$
Staarmann273
WWUS51 KPHI 092027
SVSPHI
Severe Weather Statement
National Weather Service Mount Holly NJ
427 PM EDT Sat Sep 9 2023
NJC005-007-015-PAC045-101-092037-
/O.EXP.KPHI.SV.W.0351.000000T0000Z-230909T2030Z/
Camden NJ-Gloucester NJ-Burlington NJ-Philadelphia PA-Delaware PA-
427 PM EDT Sat Sep 9 2023
...THE SEVERE THUNDERSTORM WARNING FOR NORTHWESTERN CAMDEN...NORTH
CENTRAL GLOUCESTER...WEST CENTRAL BURLINGTON...PHILADELPHIA AND EAST
CENTRAL DELAWARE COUNTIES WILL EXPIRE AT 430 PM EDT...
The storm which prompted the warning has weakened below severe
limits, and no longer poses an immediate threat to life or property.
Therefore, the warning will be allowed to expire. However small
hail, gusty winds, and heavy rain are still possible with this
thunderstorm.
A Flash Flood Warning remains in effect for portion of the area.
A Severe Thunderstorm Watch remains in effect until 1100 PM EDT for
southern New Jersey...and southeastern Pennsylvania.
To report severe weather, contact your nearest law enforcement
agency. They will relay your report to the National Weather Service
Mount Holly NJ.
LAT...LON 3974 7511 3995 7533 4009 7502 3982 7491
TIME...MOT...LOC 2027Z 150DEG 9KT 3995 7512
$$
StaarmannThe office that day
Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Sep 8, 9:33 PM EDT | Special Weather Statement | PHI | Chester | 27 min |
| Sep 8, 9:48 PM EDT | Severe Thunderstorm Warning | PHI | Chester | 42 min |
| Sep 8, 10:17 PM EDT | Severe Thunderstorm Warning | PHI | Chester, Delaware, Philadelphia | 43 min |
| Sep 8, 10:33 PM EDT | Special Weather Statement | PHI | Berks | 27 min |
| Sep 8, 10:58 PM EDT | Severe Thunderstorm Warning | PHI | Chester, Delaware, Montgomery, Philadelphia | 47 min |
| Sep 8, 11:07 PM EDT | Special Weather Statement | PHI | Carbon | 53 min |
| Sep 9, 4:05 PM EDT | Flash Flood Warning | PHI | Philadelphia | 4 hr |
| Sep 9, 4:15 PM EDT | Special Weather Statement | PHI | Bucks | 30 min |
| Sep 9, 4:29 PM EDT | Special Weather Statement | PHI | Philadelphia | 31 min |
| Sep 9, 4:57 PM EDT | Severe Thunderstorm Warning | PHI | Monroe, Northampton | 49 min |
| Sep 9, 5:18 PM EDT | Severe Thunderstorm Warning | PHI | Monroe | 45 min |
| Sep 9, 5:36 PM EDT | Special Weather Statement | PHI | Berks | 24 min |
| Sep 9, 5:43 PM EDT | Special Weather Statement | PHI | Lehigh | 32 min |
| Sep 9, 6:38 PM EDT | Special Weather Statement | PHI | Chester | 37 min |
| Sep 9, 7:20 PM EDT | Special Weather Statement | PHI | Chester | 25 min |
| Sep 9, 7:24 PM EDT | Special Weather Statement | PHI | Berks | 36 min |
| Sep 9, 7:25 PM EDT | Special Weather Statement | PHI | Lehigh | 35 min |
| Sep 9, 7:56 PM EDT | Special Weather Statement | PHI | Berks | 64 min |
| Sep 9, 12:56 PM EDT | Severe Thunderstorm Warning | PHI | Atlantic, Burlington, Ocean | 64 min |
| Sep 9, 12:57 PM EDT | Severe Thunderstorm Warning | PHI | Burlington, Ocean | 50 min |
| Sep 9, 1:17 PM EDT | Special Weather Statement | PHI | Ocean | 28 min |
| Sep 9, 1:46 PM EDT | Special Weather Statement | PHI | Ocean | 29 min |
| Sep 9, 2:07 PM EDT | Special Weather Statement | PHI | Atlantic | 38 min |
| Sep 9, 2:16 PM EDT | Special Weather Statement | PHI | Burlington | 29 min |
| Sep 9, 2:26 PM EDT | Special Weather Statement | PHI | Middlesex | 34 min |
| Sep 9, 2:42 PM EDT | Severe Thunderstorm Warning | PHI | Middlesex, Monmouth, Somerset | 48 min |
| Sep 9, 3:09 PM EDT | Severe Thunderstorm Warning | PHI | Middlesex, Somerset | 49 min |
| Sep 9, 3:40 PM EDT | Areal Flood Advisory | PHI | Middlesex, Morris, Somerset | 2 hr |
| Sep 9, 3:47 PM EDT | Severe Thunderstorm Warning | PHI | Morris | 43 min |
| Sep 9, 3:58 PM EDT | Special Weather Statement | PHI | Somerset | 32 min |
| Sep 9, 4:08 PM EDT | Severe Thunderstorm Warning | PHI | Morris, Somerset, Sussex | 53 min |
| Sep 9, 4:37 PM EDT | Severe Thunderstorm Warning | PHI | Morris, Sussex, Warren | 53 min |
| Sep 9, 4:40 PM EDT | Special Marine Warning | PHI | 65 min | |
| Sep 9, 4:42 PM EDT | Areal Flood Advisory | PHI | Morris | 3 hr |
| Sep 9, 4:49 PM EDT | Special Weather Statement | PHI | Warren | 41 min |
| Sep 9, 5:34 PM EDT | Special Weather Statement | PHI | Salem | 26 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.