Alert archive / New Jersey / Severe Thunderstorm Warnings in 2021
Severe Thunderstorm Warning 23, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Apr 29, 2021, 7:45 PM EDT for Delaware County, Philadelphia County, Pennsylvania; Camden County, Gloucester County, Salem County, New Jersey. It was in force for 45 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
- Apr 29, 2021, 7:45 PM EDT (23:45 UTC)
- Expired
- Apr 29, 2021, 8:30 PM EDT
- In force
- 45 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, Salem County, NJ, Delaware County, PA, Philadelphia County, PA
The radar
The Philadelphia radar (KDIX), 65 km from the middle of the area, began a volume at 23:44 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 |
|---|---|---|---|
| Apr 29, 7:49 PM EDT | TSTM WND DMG | Woodlyn, PA | DOWNED TREES AND WIRES NEAR VALLEY ROAD IN WOODLYN. TIME ESTIMATED FROM RADAR. |
| Apr 29, 7:51 PM EDT | TSTM WND DMG | Folcroft, PA | DOWNED WIRES NEAR HOOK ROAD IN DARBY TWP. TIME ESTIMATED FROM RADAR. |
| Apr 29, 8:00 PM EDT | TSTM WND GST 51 | Philadelphia Internatio, PA | |
| Apr 29, 8:06 PM EDT | TSTM WND DMG | Tacony, PA | MPING REPORT OF SNAPPED OR UPROOTED TREES AT THIS LOCATION. TIME ESTIMATED FROM RADAR. |
| Apr 29, 8:10 PM EDT | TSTM WND DMG | Cherry Hill, NJ | SEVERAL DOWNED TREES AND WIRES IN THE CHERRY HILL AREA. 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
Washington/Dulle, VA (KIAD), launched 12:00Z, 11.8 hours before the alert went out and 219 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
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 1285 m above ground
- 0-6 km bulk shear
- 39 kt
- 0-1 km storm-relative helicity
- -8 m²/s²
- 0-3 km storm-relative helicity
- 132 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
100
WUUS51 KPHI 292345
SVRPHI
NJC007-015-033-PAC045-101-300030-
/O.NEW.KPHI.SV.W.0023.210429T2345Z-210430T0030Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Mount Holly NJ
745 PM EDT Thu Apr 29 2021
The National Weather Service in Mount Holly NJ has issued a
* Severe Thunderstorm Warning for...
Northwestern Salem County in southern New Jersey...
Northwestern Camden County in southern New Jersey...
Northwestern Gloucester County in southern New Jersey...
Central Philadelphia County in southeastern Pennsylvania...
Delaware County in southeastern Pennsylvania...
* Until 830 PM EDT.
* At 744 PM EDT, a severe thunderstorm was located over Nether
Providence Township, or 12 miles west of Gloucester City, 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...
Philadelphia, Camden, Gloucester City, Cherry Hill, Chester,
Deptford, Voorhees, West Deptford, Lindenwold, Bellmawr, Yeadon,
Woodbury, Berlin, Palmyra, Folcroft, Swarthmore, Paulsboro,
Magnolia, Westville and Woodbury Heights.
People at the Pennsylvania Convention Center Vaccination Site, and
Gloucester County Mega Site should seek safe shelter immediately!
This includes the following highways...
New Jersey Turnpike near exit 3.
Interstate 95 in Pennsylvania between mile markers 0 and 29.
Interstate 76 in Pennsylvania between mile markers 341 and 351.
Interstate 76 in New Jersey between mile markers 0 and 3.
Interstate 295 in New Jersey between mile markers 9 and 36.
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 8.
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.
&&
LAT...LON 3979 7491 3974 7544 3978 7545 3980 7541
3982 7546 3996 7549 3999 7528 3998 7527
4004 7504 4002 7502 3999 7506 3998 7501
3995 7502 3994 7498 3988 7493
TIME...MOT...LOC 2344Z 257DEG 40KT 3990 7536
HAIL...<.75IN
WIND...60MPH
$$
Gorse3 follow-up statements
169
WWUS51 KPHI 292355
SVSPHI
Severe Weather Statement
National Weather Service Mount Holly NJ
755 PM EDT Thu Apr 29 2021
NJC007-015-033-PAC045-101-300030-
/O.CON.KPHI.SV.W.0023.000000T0000Z-210430T0030Z/
Salem NJ-Camden NJ-Gloucester NJ-Philadelphia PA-Delaware PA-
755 PM EDT Thu Apr 29 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 830 PM EDT
FOR NORTHWESTERN SALEM...NORTHWESTERN CAMDEN...NORTHWESTERN
GLOUCESTER...CENTRAL PHILADELPHIA AND SOUTHEASTERN DELAWARE
COUNTIES...
At 754 PM EDT, a severe thunderstorm was located over South
Philadelphia, or near Gloucester City, 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...
Philadelphia, Camden, Gloucester City, Cherry Hill, Chester,
Deptford, Voorhees, West Deptford, Lindenwold, Bellmawr, Yeadon,
Woodbury, Berlin, Palmyra, Folcroft, Swarthmore, Paulsboro, Magnolia,
Westville and Woodbury Heights.
People at the Pennsylvania Convention Center Vaccination Site, and
Gloucester County Mega Site should seek safe shelter immediately!
This includes the following highways...
New Jersey Turnpike near exit 3.
Interstate 95 in Pennsylvania between mile markers 5 and 29.
Interstate 76 in Pennsylvania between mile markers 341 and 351.
Interstate 76 in New Jersey between mile markers 0 and 3.
Interstate 295 in New Jersey between mile markers 9 and 36.
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.
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.
&&
LAT...LON 3979 7491 3974 7544 3980 7541 3999 7528
3998 7527 4004 7504 4002 7502 3999 7506
3998 7501 3995 7502 3994 7498 3988 7493
TIME...MOT...LOC 2354Z 263DEG 39KT 3989 7521
HAIL...<.75IN
WIND...60MPH
$$
Gorse774
WWUS51 KPHI 300007
SVSPHI
Severe Weather Statement
National Weather Service Mount Holly NJ
807 PM EDT Thu Apr 29 2021
NJC033-PAC045-300017-
/O.CAN.KPHI.SV.W.0023.000000T0000Z-210430T0030Z/
Salem NJ-Delaware PA-
807 PM EDT Thu Apr 29 2021
...THE SEVERE THUNDERSTORM WARNING FOR NORTHWESTERN SALEM AND
SOUTHEASTERN DELAWARE COUNTIES IS CANCELLED...
The severe thunderstorm which prompted the warning has moved out of
the warned area. Therefore, the warning has been cancelled.
LAT...LON 3979 7491 3975 7529 3986 7524 3987 7521
3988 7523 4001 7517 4004 7504 4002 7502
3999 7506 3998 7501 3995 7502 3994 7498
3993 7498 3988 7493
TIME...MOT...LOC 0007Z 257DEG 40KT 3992 7503
$$
NJC007-015-PAC101-300030-
/O.CON.KPHI.SV.W.0023.000000T0000Z-210430T0030Z/
Camden NJ-Gloucester NJ-Philadelphia PA-
807 PM EDT Thu Apr 29 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 830 PM EDT
FOR NORTHWESTERN CAMDEN...NORTH CENTRAL GLOUCESTER AND CENTRAL
PHILADELPHIA COUNTIES...
At 807 PM EDT, a severe thunderstorm was located over
Erlton-Ellisburg, or near Camden, moving east at 45 mph.
HAZARD...60 mph wind gusts.
SOURCE...Radar indicated.
IMPACT...Damage to roofs, siding, trees, and power lines is
possible.
Locations impacted include...
Philadelphia, Camden, Gloucester City, Cherry Hill, Deptford,
Voorhees, West Deptford, Lindenwold, Bellmawr, Woodbury, Berlin,
Palmyra, Paulsboro, Magnolia, Westville, Woodbury Heights, National
Park, Brooklawn, Audubon Park and Wissinoming.
People at the Esperanza Community Vaccination Site, Pennsylvania
Convention Center Vaccination Site, and Gloucester County Mega Site
should seek safe shelter immediately!
This includes the following highways...
New Jersey Turnpike between exits 2 and 3.
Interstate 95 in Pennsylvania between mile markers 14 and 29.
Interstate 76 in Pennsylvania between mile markers 344 and 351.
Interstate 76 in New Jersey between mile markers 0 and 3.
Interstate 295 in New Jersey between mile markers 18 and 36.
Interstate 676 in Pennsylvania between mile markers 0 and 1.
Interstate 676 in New Jersey between mile markers 0 and 4.
Atlantic City Expressway near mile marker 44.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 3979 7491 3975 7529 3986 7524 3987 7521
3988 7523 4001 7517 4004 7504 4002 7502
3999 7506 3998 7501 3995 7502 3994 7498
3993 7498 3988 7493
TIME...MOT...LOC 0007Z 257DEG 40KT 3992 7503
HAIL...<.75IN
WIND...60MPH
$$
Gorse025
WWUS51 KPHI 300021
SVSPHI
Severe Weather Statement
National Weather Service Mount Holly NJ
821 PM EDT Thu Apr 29 2021
NJC007-015-PAC101-300031-
/O.EXP.KPHI.SV.W.0023.000000T0000Z-210430T0030Z/
Camden NJ-Gloucester NJ-Philadelphia PA-
821 PM EDT Thu Apr 29 2021
...THE SEVERE THUNDERSTORM WARNING FOR NORTHWESTERN CAMDEN...NORTH
CENTRAL GLOUCESTER AND CENTRAL PHILADELPHIA COUNTIES WILL EXPIRE AT
830 PM EDT...
The storm which prompted the warning has moved out of the area.
Therefore, the warning will be allowed to expire.
LAT...LON 3979 7491 3975 7529 3986 7524 3987 7521
3988 7523 4001 7517 4004 7504 4002 7502
3999 7506 3998 7501 3995 7502 3994 7498
3993 7498 3988 7493
TIME...MOT...LOC 0021Z 257DEG 40KT 3995 7484
$$
GorseThe office that day
Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 29, 3:32 AM EDT | High Wind Watch | PHI | Berks, Bucks, Carbon, Chester, Delaware, Lehigh and 4 more | 16 hr |
| Apr 29, 7:23 PM EDT | High Wind Warning | PHI | Berks, Bucks, Carbon, Chester, Delaware, Lehigh and 4 more | 26 hr |
| Apr 28, 8:05 PM EDT | Special Weather Statement | PHI | Sussex | 40 min |
| Apr 28, 8:17 PM EDT | Severe Thunderstorm Warning | PHI | Sussex | 43 min |
| Apr 28, 9:01 PM EDT | Special Weather Statement | PHI | Passaic | 29 min |
| Apr 29, 3:29 AM EDT | Small Craft Advisory | PHI | 27 hr | |
| Apr 29, 3:29 AM EDT | Storm Watch | PHI | 21 hr | |
| Apr 29, 3:47 PM EDT | Gale Warning | PHI | 23 hr |
Nearby
Severe Thunderstorm Warnings in New Jersey, 2021Severe Thunderstorm Warnings in Pennsylvania, 2021Every severe thunderstorm warning in 2021
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.