Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2021
Severe Thunderstorm Warning 316, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Oct 25, 2021, 6:57 PM EDT for Berks County, Chester County, Delaware County, Pennsylvania; New Castle County, Delaware. It was in force for 48 min. 7 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, 6:57 PM EDT (22:57 UTC)
- Expired
- Oct 25, 2021, 7:45 PM EDT
- In force
- 48 min
- Issued by
- NWS Philadelphia/Mount Holly
- Area
- Storm-based polygon
- Hail
- 0.75 in
- Wind
- 60.0 mph
Counties New Castle County, DE, Berks County, PA, Chester County, PA, Delaware County, PA
The radar
The Philadelphia radar (KDIX), 117 km from the middle of the area, began a volume at 23:01 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, 7:13 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. |
| Oct 25, 7:30 PM EDT | TSTM WND DMG | Coatesville, PA | TREE DOWN ON WIRES NEAR COATESVILLE. TIME ESTIMATED FROM RADAR. |
| Oct 25, 7:35 PM EDT | TSTM WND DMG | 1 Nw Downington, PA | DOWNED TREE OR LIMBS ONTO WIRES NEAR HILLTOP RD. SEVERAL OTHER POWER OUTAGE REPORTS IN THE GENERAL AREA. TIME ESTIMATED FROM RADAR. |
| Oct 25, 7:52 PM EDT | TSTM WND DMG | 1 N West Vincent Twp, PA | DOWNED TREES AND WIRES NEAR HALF HILL ROAD. TIME ESTIMATED FROM RADAR. |
| Oct 25, 7:52 PM EDT | TSTM WND DMG | 2 Wsw Pughtown, PA | DOWNED TREES AND WIRES NEAR MURRAYS SCHOOL 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, 11.0 hours before the alert went out and 181 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.
135
WUUS51 KPHI 252257
SVRPHI
DEC003-PAC011-029-045-252345-
/O.NEW.KPHI.SV.W.0316.211025T2257Z-211025T2345Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Mount Holly NJ
657 PM EDT Mon Oct 25 2021
The National Weather Service in Mount Holly NJ has issued a
* Severe Thunderstorm Warning for...
Northern New Castle County in northern Delaware...
Southern Berks County in eastern Pennsylvania...
Chester County in southeastern Pennsylvania...
Western Delaware County in southeastern Pennsylvania...
* Until 745 PM EDT.
* At 657 PM EDT, severe thunderstorms were located along a line
extending from near Conowingo to Barksdale, moving north 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...
Wilmington, West Chester, Chester, Phoenixville, Coatesville,
Westtown, Downingtown, Elsmere, Kennett Square, Oxford, Parkesburg,
West Grove, Honey Brook, Elverson, Arden, New Morgan, Glen Roy,
Cheyney, Talleyville and Pughtown.
This includes the following highways...
Pennsylvania Turnpike between mile markers 296 and 324.
Interstate 95 in Pennsylvania between mile markers 0 and 3.
Interstate 95 in Delaware between mile markers 15 and 23.
Interstate 176 in Pennsylvania between mile markers 1 and 7.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 3976 7606 3987 7599 3995 7600 4004 7593
4011 7594 4014 7588 4021 7598 4025 7596
4023 7559 4015 7553 4013 7546 4009 7546
4006 7538 3983 7540 3976 7546 3972 7579
3972 7613
TIME...MOT...LOC 2257Z 199DEG 41KT 3966 7625 3967 7582
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...<.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH
$$
JEO2 follow-up statements
192
WWUS51 KPHI 252325
SVSPHI
Severe Weather Statement
National Weather Service Mount Holly NJ
725 PM EDT Mon Oct 25 2021
DEC003-252335-
/O.CAN.KPHI.SV.W.0316.000000T0000Z-211025T2345Z/
New Castle DE-
725 PM EDT Mon Oct 25 2021
...THE SEVERE THUNDERSTORM WARNING FOR NORTHERN NEW CASTLE COUNTY IS
CANCELLED...
The storms which prompted the warning have moved out of the warned
area. Therefore, the warning has been cancelled.
LAT...LON 3993 7598 3995 7600 4004 7593 4011 7594
4014 7588 4021 7598 4025 7596 4023 7559
4015 7553 4013 7550 4013 7546 4009 7546
4006 7538 3983 7540 3985 7577 3984 7601
TIME...MOT...LOC 2325Z 199DEG 41KT 3995 7612 3995 7569
$$
PAC011-029-045-252345-
/O.CON.KPHI.SV.W.0316.000000T0000Z-211025T2345Z/
Berks PA-Chester PA-Delaware PA-
725 PM EDT Mon Oct 25 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 745 PM EDT
FOR SOUTHERN BERKS...CHESTER AND WESTERN DELAWARE COUNTIES...
At 725 PM EDT, severe thunderstorms were located along a line
extending from near Quarryville to Marshallton, moving north 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...
West Chester, Chester, Phoenixville, Coatesville, Westtown,
Downingtown, Kennett Square, Parkesburg, Honey Brook, Elverson, New
Morgan, Cheyney, Pughtown, Elam, Marshallton, Chelsea, Gradyville,
Newtown Square, Chester Township and Homeville.
This includes the following highways...
Pennsylvania Turnpike between mile markers 296 and 324.
Interstate 95 in Pennsylvania between mile markers 2 and 3.
Interstate 176 in Pennsylvania between mile markers 1 and 7.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
Torrential rainfall is occurring with these storms, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.
&&
LAT...LON 3993 7598 3995 7600 4004 7593 4011 7594
4014 7588 4021 7598 4025 7596 4023 7559
4015 7553 4013 7550 4013 7546 4009 7546
4006 7538 3983 7540 3985 7577 3984 7601
TIME...MOT...LOC 2325Z 199DEG 41KT 3995 7612 3995 7569
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...<.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH
$$
JEO595
WWUS51 KPHI 252339
SVSPHI
Severe Weather Statement
National Weather Service Mount Holly NJ
739 PM EDT Mon Oct 25 2021
PAC011-029-045-252349-
/O.EXP.KPHI.SV.W.0316.000000T0000Z-211025T2345Z/
Berks PA-Chester PA-Delaware PA-
739 PM EDT Mon Oct 25 2021
...THE SEVERE THUNDERSTORM WARNING FOR SOUTHERN BERKS...CHESTER AND
WESTERN DELAWARE COUNTIES WILL EXPIRE AT 745 PM EDT...
The storms which prompted the warning have weakened below severe
limits, and no longer pose an immediate threat to life or property.
Therefore, the warning will be allowed to expire. However gusty
winds are still possible with these thunderstorms.
LAT...LON 3993 7598 3995 7600 4004 7593 4011 7594
4014 7588 4021 7598 4025 7596 4023 7559
4015 7553 4013 7550 4013 7546 4009 7546
4006 7538 3983 7540 3985 7577 3984 7601
TIME...MOT...LOC 2339Z 199DEG 41KT 3995 7612 3995 7569
$$
JEOThe office that day
Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Oct 25, 6:33 PM EDT | Severe Thunderstorm Warning | PHI | Chester, Delaware | 42 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, 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 |
Nearby
Severe 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.