Alert archive / New Jersey / Severe Thunderstorm Warnings in 2021
Severe Thunderstorm Warning 312, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Sep 28, 2021, 7:29 PM EDT for Gloucester County, Salem County, New Jersey; Delaware County, Pennsylvania; New Castle County, Delaware. It was in force for 31 min. 1 report 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 28, 2021, 7:29 PM EDT (23:29 UTC)
- Expired
- Sep 28, 2021, 8:00 PM EDT
- In force
- 31 min
- Issued by
- NWS Philadelphia/Mount Holly
- Area
- Storm-based polygon
- Hail
- 1.0 in
- Wind
- 60.0 mph
Counties New Castle County, DE, Gloucester County, NJ, Salem County, NJ, Delaware County, PA
The radar
The Philadelphia radar (KDIX), 71 km from the middle of the area, began a volume at 23:32 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
| Time | Report | Where | Remark |
|---|---|---|---|
| Sep 28, 7:32 PM EDT | TSTM WND DMG | Upper Chichester Twp, PA | SHINGLES BLOWN OFF A ROOF AND MINOR TREE DAMAGE IN UPPER CHICHESTER TOWNSHIP. 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, 11.5 hours before the alert went out and 211 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
- 35 J/kg
- Mixed-layer CIN
- -322 J/kg
- Mixed-layer LCL
- 1669 m above ground
- 0-6 km bulk shear
- 37 kt
- 0-1 km storm-relative helicity
- 38 m²/s²
- 0-3 km storm-relative helicity
- 138 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.1
The text
As transmitted.
453
WUUS51 KPHI 282329
SVRPHI
DEC003-NJC015-033-PAC045-290000-
/O.NEW.KPHI.SV.W.0312.210928T2329Z-210929T0000Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Mount Holly NJ
729 PM EDT Tue Sep 28 2021
The National Weather Service in Mount Holly NJ has issued a
* Severe Thunderstorm Warning for...
Northeastern New Castle County in northern Delaware...
Northeastern Salem County in southern New Jersey...
Northwestern Gloucester County in southern New Jersey...
Delaware County in southeastern Pennsylvania...
* Until 800 PM EDT.
* At 729 PM EDT, a severe thunderstorm was located over Chelsea, or
10 miles southeast of West Chester, moving southeast at 30 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...
Chester, Deptford, West Deptford, Glassboro, Woodbury, Pitman,
Folcroft, Swarthmore, Paulsboro, Woodstown, Woodbury Heights,
National Park, Swedesboro, Arden, Darby Township, Elam, Chelsea,
Gradyville, Chester Township and Mullica Hill.
This includes the following highways...
New Jersey Turnpike near exit 2.
Interstate 95 in Pennsylvania between mile markers 0 and 11.
Interstate 95 in Delaware between mile markers 19 and 23.
Interstate 295 in New Jersey between mile markers 7 and 23.
Interstate 476 in Pennsylvania between mile markers 0 and 6.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 4000 7543 3991 7525 3987 7526 3987 7519
3982 7508 3980 7507 3978 7509 3979 7506
3975 7504 3958 7525 3986 7559
TIME...MOT...LOC 2329Z 311DEG 26KT 3989 7544
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.00 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH
$$
PO1 follow-up statement
194
WWUS51 KPHI 282351
SVSPHI
Severe Weather Statement
National Weather Service Mount Holly NJ
751 PM EDT Tue Sep 28 2021
DEC003-NJC015-033-PAC045-290000-
/O.CON.KPHI.SV.W.0312.000000T0000Z-210929T0000Z/
New Castle DE-Salem NJ-Gloucester NJ-Delaware PA-
751 PM EDT Tue Sep 28 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 800 PM EDT
FOR NORTHEASTERN NEW CASTLE...NORTH CENTRAL SALEM...NORTHWESTERN
GLOUCESTER AND SOUTHERN DELAWARE COUNTIES...
At 751 PM EDT, a severe thunderstorm was located over Beckett, or 10
miles east of Wilmington, moving southeast at 25 mph.
HAZARD...60 mph wind gusts and quarter size hail.
SOURCE...Radar indicated.
IMPACT...Minor damage to vehicles is possible. Wind damage to roofs,
siding, trees, and power lines is possible.
Locations impacted include...
Chester, Deptford, West Deptford, Glassboro, Woodbury, Pitman,
Folcroft, Swarthmore, Paulsboro, Woodstown, Woodbury Heights,
Swedesboro, Arden, Chelsea, Beckett, Nether Providence Township,
Chester Township, Philadelphia International Arpt, Mullica Hill and
Gibbstown.
This includes the following highways...
New Jersey Turnpike near exit 2.
Interstate 95 in Pennsylvania between mile markers 0 and 10.
Interstate 95 in Delaware between mile markers 20 and 23.
Interstate 295 in New Jersey between mile markers 7 and 21.
Interstate 476 in Pennsylvania between mile markers 0 and 2.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 3991 7534 3989 7529 3987 7526 3985 7519
3981 7510 3979 7510 3978 7509 3977 7509
3975 7507 3961 7527 3984 7556
TIME...MOT...LOC 2351Z 329DEG 22KT 3977 7533
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.00 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH
$$
POThe office that day
Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Sep 28, 8:26 AM EDT | Areal Flood Advisory | PHI | Warren | 2 hr |
| Sep 28, 7:14 PM EDT | Special Weather Statement | PHI | Gloucester | 46 min |
| Sep 28, 9:23 AM EDT | Special Weather Statement | PHI | Montgomery | 37 min |
| Sep 28, 9:47 AM EDT | Special Weather Statement | PHI | Bucks, Montgomery | 28 min |
| Sep 28, 6:15 PM EDT | Special Weather Statement | PHI | Chester | 45 min |
Nearby
Severe Thunderstorm Warnings in New Jersey, 2021Severe Thunderstorm Warnings in Pennsylvania, 2021Severe Thunderstorm Warnings in Delaware, 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.