Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2020
Severe Thunderstorm Warning 166, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Jul 22, 2020, 5:33 PM EDT for New Castle County, Delaware; 4 counties in Pennsylvania; Gloucester County, New Jersey. It was in force for 57 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
- Jul 22, 2020, 5:33 PM EDT (21:33 UTC)
- Expired
- Jul 22, 2020, 6:30 PM EDT
- In force
- 57 min
- Issued by
- NWS Philadelphia/Mount Holly
- Area
- Storm-based polygon
- Hail
- 0.75 in
- Wind
- 60.0 mph
Counties New Castle County, DE, Gloucester County, NJ, Chester County, PA, Delaware County, PA, Montgomery County, PA, Philadelphia County, PA
The radar
The Philadelphia radar (KDIX), 102 km from the middle of the area, began a volume at 21:32 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 |
|---|---|---|---|
| Jul 22, 6:02 PM EDT | TSTM WND DMG | 1 Se Roxborough, PA | DOWNED TREE NEAR THE INTERSTATE 76 AND MONTGOMERY DRIVE INTERCHANGE. TIME ESTIMATED FROM RADAR. |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
The watch it was issued in
The SPC watch in force over the same counties when this warning went out.
| Issued | Product | Office | Lasted |
|---|---|---|---|
| Jul 22, 2:57 PM EDT | Severe Thunderstorm Watch | SPC | 7 hr |
The nearest sounding before it
Washington/Dulle, VA (KIAD), launched 12:00Z, 9.6 hours before the alert went out and 183 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
- 248 J/kg
- Mixed-layer CIN
- -214 J/kg
- Mixed-layer LCL
- 1163 m above ground
- 0-6 km bulk shear
- 18 kt
- 0-1 km storm-relative helicity
- 20 m²/s²
- 0-3 km storm-relative helicity
- 44 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
535
WUUS51 KPHI 222133
SVRPHI
DEC003-NJC015-PAC029-045-091-101-222230-
/O.NEW.KPHI.SV.W.0166.200722T2133Z-200722T2230Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Mount Holly NJ
533 PM EDT Wed Jul 22 2020
The National Weather Service in Mount Holly NJ has issued a
* Severe Thunderstorm Warning for...
Northern New Castle County in northern Delaware...
Northwestern Gloucester County in southern New Jersey...
Southeastern Montgomery County in southeastern Pennsylvania...
Southeastern Chester County in southeastern Pennsylvania...
Philadelphia County in southeastern Pennsylvania...
Delaware County in southeastern Pennsylvania...
* Until 630 PM EDT.
* At 533 PM EDT, severe thunderstorms were located along a line
extending from Paoli to near Kennett Square to Pleasant Hill,
moving east at 25 mph.
HAZARD...60 mph wind gusts and penny size hail.
SOURCE...Radar indicated.
IMPACT...Damage to roofs, siding, trees, and power lines is
possible.
* Locations impacted include...
Philadelphia, Wilmington, Newark, West Chester, Chester, Yeadon,
Westtown, Folcroft, Swarthmore, Elsmere, Kennett Square, Narberth,
East Lansdowne, Rockledge, Newport, Arden, Darby Township, Stanton,
Cheyney and Morris Park.
This includes the following highways...
Interstate 95 in Pennsylvania between mile markers 0 and 13, and
between mile markers 22 and 23.
Interstate 95 in Delaware between mile markers 3 and 23.
Interstate 76 in Pennsylvania between mile markers 335 and 348.
Interstate 676 in Pennsylvania between mile markers 0 and 1.
Interstate 476 in Pennsylvania between mile markers 0 and 13.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Protecting yourself from immediate threats to life and safety shall
take priority. Whenever possible, as long as it does not cause
greater harm, all COVID-19 protective action guidance should be
followed.
For your protection move to an interior room on the lowest floor of a
building.
To report severe weather, contact your nearest law enforcement
agency. They will send your report to the National Weather Service
office in Mount Holly NJ.
Torrential rainfall is occurring with these storms, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.
&&
LAT...LON 3976 7585 3985 7572 3999 7559 4011 7501
3993 7516 3978 7542 3978 7544 3975 7547
3961 7571 3970 7579 3972 7579 3972 7582
TIME...MOT...LOC 2133Z 254DEG 20KT 4004 7552 3988 7564 3969 7590
HAIL...0.75IN
WIND...60MPH
$$
MPS2 follow-up statements
805
WWUS51 KPHI 222206 RRA
SVSPHI
Severe Weather Statement
National Weather Service Mount Holly NJ
606 PM EDT Wed Jul 22 2020
PAC029-222216-
/O.CAN.KPHI.SV.W.0166.000000T0000Z-200722T2230Z/
Chester PA-
606 PM EDT Wed Jul 22 2020
...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN CHESTER COUNTY IS
CANCELLED...
The storms which prompted the warning have moved out of the warned
area. Therefore, the warning has been cancelled.
A Severe Thunderstorm Watch remains in effect until 1000 PM EDT for
northern Delaware...southern New Jersey...and southeastern
Pennsylvania.
LAT...LON 3988 7551 4003 7540 4011 7502 3991 7518
3978 7541 3978 7544 3975 7547 3963 7568
3962 7573 3969 7578
TIME...MOT...LOC 2206Z 270DEG 18KT 4005 7531 3989 7543 3970 7569
$$
DEC003-NJC015-PAC045-091-101-222230-
/O.CON.KPHI.SV.W.0166.000000T0000Z-200722T2230Z/
New Castle DE-Gloucester NJ-Montgomery PA-Philadelphia PA-
Delaware PA-
606 PM EDT Wed Jul 22 2020
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 630 PM EDT
FOR NORTHERN NEW CASTLE...NORTHWESTERN GLOUCESTER...SOUTHEASTERN
MONTGOMERY...WESTERN PHILADELPHIA AND DELAWARE COUNTIES...
At 606 PM EDT, severe thunderstorms were located along a line
extending from Bryn Mawr to near Lima to near Pike Creek, moving east
at 20 mph.
HAZARD...60 mph wind gusts and penny size hail.
SOURCE...Radar indicated.
IMPACT...Damage to roofs, siding, trees, and power lines is
possible.
Locations impacted include...
Philadelphia, Wilmington, Newark, Chester, Yeadon, Folcroft,
Swarthmore, Elsmere, Narberth, East Lansdowne, Rockledge, Newport,
Arden, Darby Township, Stanton, Morris Park, Talleyville, Elam, Bryn
Mawr and Trout Lake.
This includes the following highways...
Interstate 95 in Pennsylvania between mile markers 0 and 14, and
near mile marker 22.
Interstate 95 in Delaware between mile markers 3 and 23.
Interstate 76 in Pennsylvania between mile markers 335 and 349.
Interstate 676 in Pennsylvania between mile markers 0 and 1.
Interstate 476 in Pennsylvania between mile markers 0 and 13.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Protecting yourself from immediate threats to life and safety shall
take priority. Whenever possible, as long as it does not cause
greater harm, all COVID-19 protective action guidance should be
followed.
For your protection move to an interior room on the lowest floor of a
building.
To report severe weather contact your nearest law enforcement agency.
They will send your report to the National Weather Service office in
Mount Holly NJ.
Torrential rainfall is occurring with these storms, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.
&&
LAT...LON 3988 7551 4003 7540 4011 7502 3991 7518
3978 7541 3978 7544 3975 7547 3963 7568
3962 7573 3969 7578
TIME...MOT...LOC 2206Z 270DEG 18KT 4005 7531 3989 7543 3970 7569
HAIL...0.75IN
WIND...60MPH
$$
MPS250
WWUS51 KPHI 222220
SVSPHI
Severe Weather Statement
National Weather Service Mount Holly NJ
620 PM EDT Wed Jul 22 2020
DEC003-NJC015-PAC045-091-101-222230-
/O.EXP.KPHI.SV.W.0166.000000T0000Z-200722T2230Z/
New Castle DE-Gloucester NJ-Montgomery PA-Philadelphia PA-
Delaware PA-
620 PM EDT Wed Jul 22 2020
...THE SEVERE THUNDERSTORM WARNING FOR NORTHERN NEW CASTLE...
NORTHWESTERN GLOUCESTER...SOUTHEASTERN MONTGOMERY...WESTERN
PHILADELPHIA AND DELAWARE COUNTIES WILL EXPIRE AT 630 PM EDT...
The storms which prompted the warning have moved out of the area.
Therefore, the warning will be allowed to expire.
A Severe Thunderstorm Watch remains in effect until 1000 PM EDT for
northern Delaware...southern New Jersey...and southeastern
Pennsylvania.
To report severe weather, contact your nearest law enforcement
agency. They will relay your report to the National Weather Service
Mount Holly NJ.
LAT...LON 3988 7551 4003 7540 4011 7502 3991 7518
3978 7541 3978 7544 3975 7547 3963 7568
3962 7573 3969 7578
TIME...MOT...LOC 2220Z 254DEG 20KT 4007 7522 3991 7534 3972 7560
$$
MPSThe office that day
Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 21, 10:14 PM EDT | Special Weather Statement | PHI | Kent | 46 min |
| Jul 21, 10:21 PM EDT | Severe Thunderstorm Warning | PHI | Kent | 54 min |
| Jul 22, 5:23 PM EDT | Severe Thunderstorm Warning | PHI | Kent, Sussex | 52 min |
| Jul 22, 5:54 PM EDT | Severe Thunderstorm Warning | PHI | Kent, New Castle | 51 min |
| Jul 21, 8:45 PM EDT | Special Weather Statement | PHI | Berks | 30 min |
| Jul 21, 9:20 PM EDT | Special Weather Statement | PHI | Montgomery | 25 min |
| Jul 22, 1:36 PM EDT | Special Weather Statement | PHI | Carbon | 24 min |
| Jul 22, 1:58 PM EDT | Special Weather Statement | PHI | Monroe | 32 min |
| Jul 22, 2:10 PM EDT | Severe Thunderstorm Warning | PHI | Monroe, Northampton | 50 min |
| Jul 22, 3:29 PM EDT | Special Weather Statement | PHI | Lebanon | 46 min |
| Jul 22, 3:39 PM EDT | Severe Thunderstorm Warning | PHI | Berks | 51 min |
| Jul 22, 4:01 PM EDT | Severe Thunderstorm Warning | PHI | Chester | 22 min |
| Jul 22, 4:10 PM EDT | Severe Thunderstorm Warning | PHI | Berks, Carbon, Lehigh, Northampton | 65 min |
| Jul 22, 4:25 PM EDT | Severe Thunderstorm Warning | PHI | Berks, Bucks, Chester, Lehigh, Montgomery | 50 min |
| Jul 22, 4:38 PM EDT | Severe Thunderstorm Warning | PHI | Chester | 52 min |
| Jul 22, 4:49 PM EDT | Severe Thunderstorm Warning | PHI | Berks, Bucks, Carbon, Lehigh, Monroe, Northampton | 56 min |
| Jul 22, 5:09 PM EDT | Severe Thunderstorm Warning | PHI | Berks, Bucks, Chester, Delaware, Lehigh, Montgomery and 1 more | 66 min |
| Jul 22, 5:16 PM EDT | Severe Thunderstorm Warning | PHI | Bucks, Monroe, Northampton | 59 min |
| Jul 22, 5:23 PM EDT | Areal Flood Advisory | PHI | Northampton | 3 hr |
| Jul 22, 5:40 PM EDT | Severe Thunderstorm Warning | PHI | Bucks, Montgomery, Philadelphia | 65 min |
| Jul 21, 10:57 PM EDT | Special Marine Warning | PHI | 63 min | |
| Jul 22, 3:04 PM EDT | Severe Thunderstorm Warning | PHI | Sussex | 30 min |
| Jul 22, 3:18 PM EDT | Special Weather Statement | PHI | Morris, Warren | 42 min |
| Jul 22, 3:50 PM EDT | Severe Thunderstorm Warning | PHI | Hunterdon, Morris, Sussex, Warren | 29 min |
| Jul 22, 4:33 PM EDT | Special Weather Statement | PHI | Morris | 57 min |
| Jul 22, 4:56 PM EDT | Severe Thunderstorm Warning | PHI | Hunterdon, Morris, Somerset | 49 min |
| Jul 22, 5:49 PM EDT | Special Marine Warning | PHI | 86 min | |
| Jul 22, 6:04 PM EDT | Severe Thunderstorm Warning | PHI | Hunterdon, Middlesex, Morris, Somerset, Sussex, Warren | 60 min |
| Jul 22, 6:12 PM EDT | Severe Thunderstorm Warning | PHI | Burlington, Camden, Gloucester, Salem | 48 min |
| Jul 22, 6:17 PM EDT | Severe Thunderstorm Warning | PHI | Burlington, Mercer, Middlesex, Monmouth, Ocean, Somerset | 52 min |
| Jul 22, 6:46 PM EDT | Severe Thunderstorm Warning | PHI | Atlantic, Camden, Cape May, Cumberland, Gloucester, Salem | 44 min |
| Jul 22, 6:47 PM EDT | Special Marine Warning | PHI | 28 min | |
| Jul 22, 6:52 PM EDT | Areal Flood Advisory | PHI | Middlesex, Somerset | 113 min |
| Jul 22, 6:52 PM EDT | Special Marine Warning | PHI | 41 min | |
| Jul 22, 7:20 PM EDT | Special Marine Warning | PHI | 55 min | |
| Jul 22, 7:23 PM EDT | Severe Thunderstorm Warning | PHI | Atlantic, Burlington, Camden, Cape May, Cumberland, Gloucester and 1 more | 52 min |
| Jul 22, 7:58 PM EDT | Severe Thunderstorm Warning | PHI | Atlantic, Burlington, Camden, Ocean | 47 min |
| Jul 22, 7:59 PM EDT | Special Marine Warning | PHI | 61 min |
Nearby
Severe Thunderstorm Warnings in Pennsylvania, 2020Severe Thunderstorm Warnings in Delaware, 2020Severe Thunderstorm Warnings in New Jersey, 2020Every severe thunderstorm warning in 2020
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.