Alert archive / New Jersey / Severe Thunderstorm Warnings in 2020
Severe Thunderstorm Warning 235, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Aug 12, 2020, 2:44 PM EDT for Camden County, Gloucester County, New Jersey; Delaware County, Philadelphia County, Pennsylvania. It was in force for 46 min. 3 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
- Aug 12, 2020, 2:44 PM EDT (18:44 UTC)
- Expired
- Aug 12, 2020, 3:30 PM EDT
- In force
- 46 min
- Issued by
- NWS Philadelphia/Mount Holly
- Area
- Storm-based polygon
- Hail
- 0.75 in
- Wind
- 60.0 mph
Counties Camden County, NJ, Gloucester County, NJ, Delaware County, PA, Philadelphia County, PA
The radar
The Philadelphia radar (KDIX), 62 km from the middle of the area, began a volume at 18:43 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 |
|---|---|---|---|
| Aug 12, 2:54 PM EDT | TSTM WND DMG | 1 N Blackwood, NJ | DOWNED TREE LIMBS AND POWER LINES NEAR KEYSTONE AVENUE IN BLACKWOOD. TIME ESTIMATED FROM RADAR. |
| Aug 12, 2:57 PM EDT | TSTM WND DMG | Blackwood, NJ | SEVERAL REPORTS OF WIRES DOWN IN THE BLACKWOOD AREA. TIME ESTIMATED FROM RADAR. |
| Aug 12, 3:25 PM EDT | TSTM WND DMG | 1 S Sewell, NJ | LARGE TREE DOWN ON NEW ST. TIME ESTIMATED FROM RADAR. |
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, 6.7 hours before the alert went out and 218 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
- 1590 J/kg
- Mixed-layer CIN
- -21 J/kg
- Mixed-layer LCL
- 729 m above ground
- 0-6 km bulk shear
- 14 kt
- 0-1 km storm-relative helicity
- 3 m²/s²
- 0-3 km storm-relative helicity
- 17 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
164
WUUS51 KPHI 121844
SVRPHI
NJC007-015-PAC045-101-121930-
/O.NEW.KPHI.SV.W.0235.200812T1844Z-200812T1930Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Mount Holly NJ
244 PM EDT Wed Aug 12 2020
The National Weather Service in Mount Holly NJ has issued a
* Severe Thunderstorm Warning for...
Northwestern Camden County in southern New Jersey...
Northern Gloucester County in southern New Jersey...
Southwestern Philadelphia County in southeastern Pennsylvania...
Southeastern Delaware County in southeastern Pennsylvania...
* Until 330 PM EDT.
* At 244 PM EDT, a severe thunderstorm was located over Woodbury
Heights, or near Gloucester City, and is nearly stationary.
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, Cherry Hill, Chester,
Deptford, West Deptford, Lindenwold, Bellmawr, Yeadon, Woodbury,
Pitman, Folcroft, Swarthmore, 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 7 and 24.
Interstate 76 in Pennsylvania between mile markers 344 and 351.
Interstate 76 in New Jersey between mile markers 0 and 3.
Interstate 295 in New Jersey between mile markers 12 and 35.
Interstate 676 in Pennsylvania between mile markers 0 and 1.
Interstate 676 in New Jersey between mile markers 0 and 4.
Interstate 476 in Pennsylvania between mile markers 0 and 1, and
near mile marker 6.
Atlantic City Expressway between mile markers 39 and 44.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Protecting yourself from immediate threats to life and safety shall
take priority. Whenever possible, as long as it does not cause
greater harm, all COVID-19 protective action guidance should be
followed.
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 3977 7534 3995 7536 3999 7502 3998 7501
3995 7502 3994 7498 3971 7498
TIME...MOT...LOC 1844Z 271DEG 1KT 3981 7514
HAIL...<.75IN
WIND...60MPH
$$
CMS2 follow-up statements
885
WWUS51 KPHI 121903
SVSPHI
Severe Weather Statement
National Weather Service Mount Holly NJ
303 PM EDT Wed Aug 12 2020
NJC007-015-PAC045-101-121930-
/O.CON.KPHI.SV.W.0235.000000T0000Z-200812T1930Z/
Camden NJ-Gloucester NJ-Philadelphia PA-Delaware PA-
303 PM EDT Wed Aug 12 2020
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 330 PM EDT
FOR NORTHWESTERN CAMDEN...NORTHERN GLOUCESTER...SOUTHWESTERN
PHILADELPHIA AND SOUTHEASTERN DELAWARE COUNTIES...
At 302 PM EDT, a severe thunderstorm was located over Woodbury
Heights, or near Gloucester City, and is nearly stationary.
HAZARD...60 mph wind gusts.
SOURCE...Law enforcement. Reports of trees and wires down have been
received from the West Deptford area.
IMPACT...Damage to roofs, siding, trees, and power lines is
possible.
Locations impacted include...
Philadelphia, Camden, Gloucester City, Cherry Hill, Deptford, West
Deptford, Lindenwold, Bellmawr, Yeadon, Woodbury, Pitman, Folcroft,
Paulsboro, Magnolia, Westville, Woodbury Heights, National Park, East
Lansdowne, Brooklawn and Audubon Park.
This includes the following highways...
New Jersey Turnpike near exit 3.
Interstate 95 in Pennsylvania between mile markers 9 and 21.
Interstate 76 in Pennsylvania between mile markers 345 and 351.
Interstate 76 in New Jersey between mile markers 0 and 3.
Interstate 295 in New Jersey between mile markers 13 and 35.
Interstate 676 in New Jersey between mile markers 0 and 4.
Atlantic City Expressway between mile markers 39 and 44.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Protecting yourself from immediate threats to life and safety shall
take priority. Whenever possible, as long as it does not cause
greater harm, all COVID-19 protective action guidance should be
followed.
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 3977 7534 3996 7528 3996 7520 3994 7498
3971 7498
TIME...MOT...LOC 1902Z 271DEG 1KT 3981 7513
HAIL...<.75IN
WIND...60MPH
$$
CMS741
WWUS51 KPHI 121925
SVSPHI
Severe Weather Statement
National Weather Service Mount Holly NJ
325 PM EDT Wed Aug 12 2020
NJC007-015-PAC045-101-121935-
/O.EXP.KPHI.SV.W.0235.000000T0000Z-200812T1930Z/
Camden NJ-Gloucester NJ-Philadelphia PA-Delaware PA-
325 PM EDT Wed Aug 12 2020
...THE SEVERE THUNDERSTORM WARNING FOR NORTHWESTERN CAMDEN...NORTHERN
GLOUCESTER...SOUTHWESTERN PHILADELPHIA AND SOUTHEASTERN DELAWARE
COUNTIES WILL EXPIRE AT 330 PM EDT...
The storm which prompted the warning has moved out of the area.
Therefore, the warning will be allowed to expire. However, heavy
rain is still possible with this thunderstorm.
LAT...LON 3977 7534 3996 7528 3996 7520 3994 7498
3971 7498
TIME...MOT...LOC 1925Z 271DEG 1KT 3981 7512
$$
CMSThe office that day
Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 12, 12:06 PM EDT | Special Weather Statement | PHI | Monmouth | 24 min |
| Aug 12, 12:16 PM EDT | Special Weather Statement | PHI | Burlington | 29 min |
| Aug 12, 12:33 PM EDT | Severe Thunderstorm Warning | PHI | Burlington | 42 min |
| Aug 12, 12:43 PM EDT | Areal Flood Advisory | PHI | Burlington, Camden, Gloucester, Mercer, Monmouth, Ocean and 1 more | 3 hr |
| Aug 12, 12:45 PM EDT | Severe Thunderstorm Warning | PHI | Monmouth, Ocean | 45 min |
| Aug 12, 1:12 PM EDT | Flash Flood Warning | PHI | Burlington | 3 hr |
| Aug 12, 1:12 PM EDT | Severe Thunderstorm Warning | PHI | Burlington, Camden, Gloucester, Monmouth, Ocean | 48 min |
| Aug 12, 1:25 PM EDT | Severe Thunderstorm Warning | PHI | Monmouth, Ocean | 50 min |
| Aug 12, 1:54 PM EDT | Severe Thunderstorm Warning | PHI | Burlington, Camden, Gloucester | 51 min |
| Aug 12, 1:57 PM EDT | Severe Thunderstorm Warning | PHI | Atlantic, Burlington, Ocean | 48 min |
| Aug 12, 2:40 PM EDT | Flash Flood Warning | PHI | Burlington, Camden, Gloucester | 3 hr |
| Aug 12, 2:42 PM EDT | Severe Thunderstorm Warning | PHI | Burlington, Ocean | 25 min |
| Aug 12, 3:12 PM EDT | Severe Thunderstorm Warning | PHI | Atlantic, Burlington, Camden, Gloucester, Salem | 29 min |
| Aug 12, 3:54 PM EDT | Special Marine Warning | PHI | 53 min | |
| Aug 12, 11:48 AM EDT | Special Weather Statement | PHI | Philadelphia | 27 min |
| Aug 12, 1:47 PM EDT | Flash Flood Warning | PHI | Chester, Delaware | 2 hr |
| Aug 12, 2:04 PM EDT | Severe Thunderstorm Warning | PHI | Bucks, Montgomery, Philadelphia | 21 min |
| Aug 12, 3:20 PM EDT | Severe Thunderstorm Warning | PHI | Chester, Delaware | 29 min |
| Aug 12, 3:36 PM EDT | Flash Flood Warning | PHI | Chester | 108 min |
| Aug 12, 5:04 PM EDT | Areal Flood Advisory | PHI | Lehigh, Northampton | 56 min |
| Aug 12, 5:09 PM EDT | Areal Flood Warning | PHI | Berks | 51 min |
Nearby
Severe Thunderstorm Warnings in New Jersey, 2020Severe Thunderstorm Warnings in Pennsylvania, 2020Every severe thunderstorm warning in 2020
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.