Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2021
Severe Thunderstorm Warning 315, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Oct 25, 2021, 6:33 PM EDT for New Castle County, Delaware; Chester County, Delaware County, Pennsylvania; Salem County, New Jersey. It was in force for 42 min. 4 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
- Oct 25, 2021, 6:33 PM EDT (22:33 UTC)
- Expired
- Oct 25, 2021, 7:15 PM EDT
- In force
- 42 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, Delaware County, PA
The radar
The Dover AFB radar (KDOX), 99 km from the middle of the area, began a volume at 22:35 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 |
|---|---|---|---|
| Oct 25, 7:05 PM EDT | HAIL 0.25 | Newark, DE | |
| Oct 25, 7:13 PM EDT | TSTM WND DMG | 1 Sw Winterthur, DE | DOWNED TREE ON WALNUT GREEN ROAD. TIME ESTIMATED FROM RADAR. |
| Oct 25, 7:13 PM EDT | TSTM WND DMG | 3 Wsw Brookfield, PA | TREE AND WIRES DOWN ON CENTER MILL RD. TIME ESTIMATED FROM RADAR. |
| Oct 25, 7:22 PM EDT | TSTM WND DMG | 2 Ene Kennett Square, PA | DOWNED TREES AND WIRES NEAR SILLS MILL ROAD. 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, 10.6 hours before the alert went out and 179 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
- 1230 m above ground
- 0-6 km bulk shear
- 31 kt
- 0-1 km storm-relative helicity
- 213 m²/s²
- 0-3 km storm-relative helicity
- 196 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
063
WUUS51 KPHI 252233
SVRPHI
DEC003-NJC033-PAC029-045-252315-
/O.NEW.KPHI.SV.W.0315.211025T2233Z-211025T2315Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Mount Holly NJ
633 PM EDT Mon Oct 25 2021
The National Weather Service in Mount Holly NJ has issued a
* Severe Thunderstorm Warning for...
New Castle County in northern Delaware...
Northwestern Salem County in southern New Jersey...
South central Chester County in southeastern Pennsylvania...
Southwestern Delaware County in southeastern Pennsylvania...
* Until 715 PM EDT.
* At 633 PM EDT, a severe thunderstorm was located over Warwick, or
near Middletown, moving north at 40 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, Middletown, Chester, Pennsville, Carneys Point,
Elsmere, Kennett Square, New Castle, Penns Grove, Salem, Delaware
City, Newport, Arden, Stanton, North Star, Glasgow, Bear,
Talleyville and Port Penn.
This includes the following highways...
Interstate 95 in Pennsylvania between mile markers 0 and 1.
Interstate 95 in Delaware between mile markers 0 and 23.
Interstate 295 in New Jersey between mile markers 0 and 6.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
This severe thunderstorm may contain little or no lightning. Do not
wait until you hear thunder before taking cover.
&&
LAT...LON 3987 7577 3983 7538 3979 7541 3978 7544
3978 7541 3976 7540 3936 7552 3937 7577
3968 7579
TIME...MOT...LOC 2233Z 199DEG 35KT 3942 7575
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...<.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH
$$
JEO2 follow-up statements
618
WWUS51 KPHI 252247
SVSPHI
Severe Weather Statement
National Weather Service Mount Holly NJ
647 PM EDT Mon Oct 25 2021
DEC003-NJC033-PAC029-045-252315-
/O.CON.KPHI.SV.W.0315.000000T0000Z-211025T2315Z/
New Castle DE-Salem NJ-Chester PA-Delaware PA-
647 PM EDT Mon Oct 25 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 715 PM EDT
FOR NEW CASTLE...NORTHWESTERN SALEM...SOUTH CENTRAL CHESTER AND
SOUTHWESTERN DELAWARE COUNTIES...
At 647 PM EDT, a severe thunderstorm was located over Saint Georges,
or 7 miles north of Middletown, moving north at 40 mph.
HAZARD...60 mph wind gusts.
SOURCE...Radar indicated.
IMPACT...Damage to roofs, siding, trees, and power lines is
possible.
Locations impacted include...
Wilmington, Newark, Chester, Pennsville, Carneys Point, Elsmere,
Kennett Square, New Castle, Penns Grove, Salem, Delaware City,
Newport, Arden, Stanton, North Star, Glasgow, Bear, Talleyville, Port
Penn and Wilmington Manor.
This includes the following highways...
Interstate 95 in Pennsylvania between mile markers 0 and 1.
Interstate 95 in Delaware between mile markers 0 and 23.
Interstate 295 in New Jersey between mile markers 0 and 6.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
This severe thunderstorm may contain little or no lightning. Do not
wait until you hear thunder before taking cover.
&&
LAT...LON 3987 7577 3983 7538 3980 7541 3979 7541
3978 7544 3978 7541 3976 7540 3946 7549
3948 7578 3968 7579
TIME...MOT...LOC 2247Z 199DEG 35KT 3955 7569
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...<.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH
$$
JEO759
WWUS51 KPHI 252312
SVSPHI
Severe Weather Statement
National Weather Service Mount Holly NJ
712 PM EDT Mon Oct 25 2021
DEC003-NJC033-PAC029-045-252322-
/O.EXP.KPHI.SV.W.0315.000000T0000Z-211025T2315Z/
New Castle DE-Salem NJ-Chester PA-Delaware PA-
712 PM EDT Mon Oct 25 2021
...THE SEVERE THUNDERSTORM WARNING FOR NEW CASTLE...NORTHWESTERN
SALEM...SOUTH CENTRAL CHESTER AND SOUTHWESTERN DELAWARE COUNTIES WILL
EXPIRE AT 715 PM EDT...
The storm which prompted the warning has moved out of the area.
Therefore, the warning will be allowed to expire.
LAT...LON 3987 7577 3983 7538 3980 7541 3979 7541
3978 7544 3978 7541 3976 7540 3946 7549
3948 7578 3968 7579
TIME...MOT...LOC 2312Z 199DEG 35KT 3976 7560
$$
JEOThe office that day
Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Oct 25, 4:15 PM EDT | Special Weather Statement | PHI | Sussex | 30 min |
| Oct 25, 5:27 PM EDT | Special Weather Statement | PHI | Kent | 33 min |
| Oct 25, 6:27 PM EDT | Special Weather Statement | PHI | New Castle | 33 min |
| Oct 25, 6:57 PM EDT | Severe Thunderstorm Warning | PHI | New Castle | 48 min |
| Oct 25, 7:34 PM EDT | Severe Thunderstorm Warning | PHI | Delaware, Philadelphia | 26 min |
| Oct 25, 7:43 PM EDT | Special Weather Statement | PHI | Bucks, Montgomery | 47 min |
| Oct 25, 3:12 AM EDT | Gale Watch | PHI | 13 hr | |
| Oct 25, 4:15 PM EDT | Gale Warning | PHI | 46 hr | |
| Oct 25, 6:03 PM EDT | Special Marine Warning | PHI | 57 min | |
| Oct 25, 7:02 PM EDT | Special Weather Statement | PHI | Camden, Gloucester, Salem | 43 min |
Nearby
Severe Thunderstorm Warnings in Pennsylvania, 2021Severe Thunderstorm Warnings in Delaware, 2021Severe Thunderstorm Warnings in New Jersey, 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.