Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2021
Severe Thunderstorm Warning 313, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Oct 16, 2021, 3:31 PM EDT for Chester County, Pennsylvania; Salem County, New Jersey; New Castle County, Delaware. It was in force for 18 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
- Oct 16, 2021, 3:31 PM EDT (19:31 UTC)
- Expired
- Oct 16, 2021, 3:49 PM EDT
- In force
- 18 min
- Issued by
- NWS Philadelphia/Mount Holly
- Area
- Storm-based polygon
- Hail
- 0.75 in
- Wind
- 60.0 mph
Counties New Castle County, DE, Salem County, NJ, Chester County, PA
The radar
The Dover AFB radar (KDOX), 101 km from the middle of the area, began a volume at 19:34 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 nearest sounding before it
Washington/Dulle, VA (KIAD), launched 12:00Z, 7.5 hours before the alert went out and 170 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
- 1259 m above ground
- 0-6 km bulk shear
- 41 kt
- 0-1 km storm-relative helicity
- 141 m²/s²
- 0-3 km storm-relative helicity
- 192 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
408
WUUS51 KPHI 161931
SVRPHI
DEC003-NJC033-PAC029-162000-
/O.NEW.KPHI.SV.W.0313.211016T1931Z-211016T2000Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Mount Holly NJ
331 PM EDT Sat Oct 16 2021
The National Weather Service in Mount Holly NJ has issued a
* Severe Thunderstorm Warning for...
Northern New Castle County in northern Delaware...
West central Salem County in southern New Jersey...
Southern Chester County in southeastern Pennsylvania...
* Until 400 PM EDT.
* At 331 PM EDT, a severe thunderstorm was located over Barksdale, or
over Newark, moving east 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...
Wilmington, Newark, Pennsville, Carneys Point, Elsmere, New Castle,
Newport, Greenville, Stanton, North Star, Glasgow, Bear,
Talleyville, Delaware Memorial Bridge, Wilmington Manor, Pike
Creek, Hockessin, Ashland, Bellefonte and Edgemoor.
This includes the following highways...
Interstate 95 in Delaware between mile markers 0 and 18.
Interstate 295 in New Jersey 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 3982 7565 3983 7552 3961 7544 3957 7578
3962 7579 3972 7579 3972 7585
TIME...MOT...LOC 1931Z 249DEG 29KT 3966 7580
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...<.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH
$$
Fitzsimmons1 follow-up statement
258
WWUS51 KPHI 161949
SVSPHI
Severe Weather Statement
National Weather Service Mount Holly NJ
349 PM EDT Sat Oct 16 2021
DEC003-NJC033-PAC029-161958-
/O.CAN.KPHI.SV.W.0313.000000T0000Z-211016T2000Z/
New Castle DE-Salem NJ-Chester PA-
349 PM EDT Sat Oct 16 2021
...THE SEVERE THUNDERSTORM WARNING FOR NORTHERN NEW CASTLE...WEST
CENTRAL SALEM AND SOUTHERN CHESTER COUNTIES IS CANCELLED...
The storm which prompted the warning has weakened below severe
limits, and no longer poses an immediate threat to life or property.
Therefore, the warning has been cancelled. However gusty winds are
still likely with this thunderstorm with gusts up to 45 mph
possible.
LAT...LON 3982 7565 3983 7552 3961 7544 3957 7578
3962 7579 3972 7579 3972 7585
TIME...MOT...LOC 1947Z 249DEG 29KT 3971 7563
$$
FitzsimmonsThe office that day
Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Oct 16, 1:39 PM EDT | Special Weather Statement | PHI | Berks | 51 min |
| Oct 16, 2:32 PM EDT | Special Weather Statement | PHI | Berks, Lehigh | 58 min |
| Oct 16, 2:44 PM EDT | Special Weather Statement | PHI | Chester | 61 min |
| Oct 16, 3:41 PM EDT | Special Weather Statement | PHI | Bucks | 49 min |
| Oct 16, 4:02 PM EDT | Severe Thunderstorm Warning | PHI | Bucks | 43 min |
| Oct 16, 4:18 PM EDT | Special Weather Statement | PHI | Delaware, Montgomery, Philadelphia | 57 min |
| Oct 16, 10:35 AM EDT | Coastal Flood Statement | PHI | Ocean | 2 hr |
| Oct 16, 3:22 PM EDT | Special Marine Warning | PHI | 113 min | |
| Oct 16, 5:10 PM EDT | Special Marine Warning | PHI | 95 min | |
| Oct 16, 5:29 PM EDT | Special Marine Warning | PHI | 91 min | |
| Oct 16, 6:09 PM EDT | Special Marine Warning | PHI | 66 min | |
| Oct 16, 6:52 PM EDT | Coastal Flood Statement | PHI | Ocean | 4 hr |
| Oct 16, 3:40 PM EDT | Special Weather Statement | PHI | New Castle | 50 min |
Nearby
Severe Thunderstorm Warnings in Pennsylvania, 2021Severe Thunderstorm Warnings in New Jersey, 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.