Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2022
Severe Thunderstorm Warning 37, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at May 20, 2022, 2:27 PM EDT for 4 counties in Pennsylvania; Gloucester County, New Jersey; New Castle County, Delaware. It was in force for 48 min. 20 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
- May 20, 2022, 2:27 PM EDT (18:27 UTC)
- Expired
- May 20, 2022, 3:15 PM EDT
- In force
- 48 min
- Issued by
- NWS Philadelphia/Mount Holly
- Area
- Storm-based polygon
- Hail
- 0.88 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), 77 km from the middle of the area, began a volume at 18:28 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 |
|---|---|---|---|
| May 20, 2:28 PM EDT | HAIL 0.7 | Chadds Ford Twp, PA | |
| May 20, 2:32 PM EDT | HAIL 0.25 | Chadds Ford Twp, PA | |
| May 20, 2:35 PM EDT | HAIL 0.25 | Glen Mills, PA | |
| May 20, 2:35 PM EDT | HAIL 0.25 | Upper Chichester Twp, PA | |
| May 20, 2:35 PM EDT | HAIL 0.7 | 1 N Glen Mills, PA | |
| May 20, 2:36 PM EDT | HAIL 0.88 | Talleyville, DE | |
| May 20, 2:50 PM EDT | HAIL 1 | Green Ridge, PA | REPORT FROM MPING: QUARTER (1.00 IN.). |
| May 20, 2:54 PM EDT | HAIL 1.25 | Swarthmore, PA | |
| May 20, 2:55 PM EDT | HAIL 0.88 | Ridley Twp., PA | |
| May 20, 2:57 PM EDT | HAIL 1 | Aston Twp., PA | |
| May 20, 3:00 PM EDT | HAIL 1 | Upper Darby, PA | |
| May 20, 3:00 PM EDT | HAIL 1.5 | Folsom, PA | |
| May 20, 3:01 PM EDT | HAIL 0.88 | Secane, PA | |
| May 20, 3:02 PM EDT | HAIL 0.88 | Clifton Heights, PA | |
| May 20, 3:04 PM EDT | HAIL 0.75 | Morton, PA | REPORT FROM MPING: DIME (0.75 IN.). |
| May 20, 3:10 PM EDT | HAIL 0.75 | 1 Se Point Breeze, PA | REPORT FROM MPING: DIME (0.75 IN.). |
| May 20, 3:15 PM EDT | HAIL 0.88 | 2 E South Philadelphia, PA | |
| May 20, 3:15 PM EDT | HAIL 1.25 | 1 Sse Point Breeze, PA | HAIL UP TO HALF DOLLAR SIZE IN SOUTH PHILLY. TIME ESTIMATED FROM RADAR. |
| May 20, 3:16 PM EDT | HAIL 1 | 2 Ese Point Breeze, PA | HAIL AROUND 1 INCH DIAMETER NEAR DICKINSON SQUARE PARK IN SOUTH PHILLY. |
| May 20, 3:20 PM EDT | HAIL 1 | 1 Sse Point Breeze, PA |
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 |
|---|---|---|---|
| May 20, 11:35 AM EDT | Tornado Watch | SPC | 7 hr |
The nearest sounding before it
Washington/Dulle, VA (KIAD), launched 12:00Z, 6.5 hours before the alert went out and 209 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
- 1 J/kg
- Mixed-layer CIN
- -226 J/kg
- Mixed-layer LCL
- 1469 m above ground
- 0-6 km bulk shear
- 34 kt
- 0-1 km storm-relative helicity
- 106 m²/s²
- 0-3 km storm-relative helicity
- 169 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- -0.2
The text
As transmitted.
219
WUUS51 KPHI 201827
SVRPHI
DEC003-NJC015-PAC029-045-091-101-201915-
/O.NEW.KPHI.SV.W.0037.220520T1827Z-220520T1915Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Mount Holly NJ
227 PM EDT Fri May 20 2022
The National Weather Service in Mount Holly NJ has issued a
* Severe Thunderstorm Warning for...
Northeastern New Castle County in northern Delaware...
Northwestern Gloucester County in southern New Jersey...
South central Montgomery County in southeastern Pennsylvania...
Southeastern Chester County in southeastern Pennsylvania...
Southwestern Philadelphia County in southeastern Pennsylvania...
Delaware County in southeastern Pennsylvania...
* Until 315 PM EDT.
* At 227 PM EDT, a severe thunderstorm was located over Ashland, or 8
miles northwest of Wilmington, moving northeast at 25 mph.
HAZARD...60 mph wind gusts and nickel size hail.
SOURCE...Radar indicated.
IMPACT...Damage to roofs, siding, trees, and power lines is
possible.
* Locations impacted include...
Philadelphia, Wilmington, Chester, Yeadon, Westtown, Conshohocken,
Folcroft, Swarthmore, Elsmere, Paulsboro, Kennett Square,
Westville, Narberth, National Park, East Lansdowne, Brooklawn,
Arden, Darby Township, Cheyney and Morris Park.
This includes the following highways...
Interstate 95 in Pennsylvania between mile markers 0 and 19.
Interstate 95 in Delaware between mile markers 15 and 23.
Interstate 76 in Pennsylvania between mile markers 331 and 339, and
between mile markers 341 and 351.
Interstate 676 in Pennsylvania near mile marker 0.
Interstate 476 in Pennsylvania between mile markers 0 and 18.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
A Tornado Watch remains in effect until 700 PM EDT for northern
Delaware...southern New Jersey...and southeastern Pennsylvania.
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.
A Tornado Watch remains in effect until 700 PM EDT for northern
Delaware...southern New Jersey...and southeastern Pennsylvania.
&&
LAT...LON 4011 7527 3990 7513 3989 7514 3987 7512
3987 7513 3972 7566 3986 7577
TIME...MOT...LOC 1827Z 242DEG 23KT 3982 7564
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...0.88 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH
$$
MPS2 follow-up statements
824
WWUS51 KPHI 201846
SVSPHI
Severe Weather Statement
National Weather Service Mount Holly NJ
246 PM EDT Fri May 20 2022
PAC029-091-201855-
/O.CAN.KPHI.SV.W.0037.000000T0000Z-220520T1915Z/
Montgomery PA-Chester PA-
246 PM EDT Fri May 20 2022
...THE SEVERE THUNDERSTORM WARNING FOR SOUTH CENTRAL MONTGOMERY AND
SOUTHEASTERN CHESTER COUNTIES IS CANCELLED...
The severe thunderstorm which prompted the warning has moved out of
the warned area. Therefore, the warning has been cancelled.
A Tornado Watch remains in effect until 700 PM EDT for northern
Delaware...southern New Jersey...and southeastern Pennsylvania.
LAT...LON 3976 7552 3992 7552 3994 7516 3990 7513
3989 7514 3987 7512 3987 7513
TIME...MOT...LOC 1845Z 271DEG 32KT 3983 7543
$$
DEC003-NJC015-PAC045-101-201915-
/O.CON.KPHI.SV.W.0037.000000T0000Z-220520T1915Z/
New Castle DE-Gloucester NJ-Philadelphia PA-Delaware PA-
246 PM EDT Fri May 20 2022
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 315 PM EDT
FOR NORTHEASTERN NEW CASTLE...NORTHWESTERN GLOUCESTER...SOUTHWESTERN
PHILADELPHIA AND SOUTHERN DELAWARE COUNTIES...
At 245 PM EDT, a severe thunderstorm was located over Chester
Township, or 8 miles northeast of Wilmington, moving east at 35 mph.
HAZARD...60 mph wind gusts and nickel size hail.
SOURCE...Radar indicated.
IMPACT...Damage to roofs, siding, trees, and power lines is
possible.
Locations impacted include...
Philadelphia, Chester, Yeadon, Folcroft, Swarthmore, Paulsboro,
Westville, National Park, Brooklawn, Arden, Darby Township, Chelsea,
Chester Township, Tinicum Township, Lima, South Philadelphia, Nether
Providence Township, Philadelphia International Arpt, Philadelphia
International Airport and Concordville.
This includes the following highways...
Interstate 95 in Pennsylvania between mile markers 0 and 19.
Interstate 95 in Delaware between mile markers 18 and 23.
Interstate 76 in Pennsylvania between mile markers 346 and 351.
Interstate 476 in Pennsylvania between mile markers 0 and 4.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
A Tornado Watch remains in effect until 700 PM EDT for northern
Delaware...southern New Jersey...and southeastern Pennsylvania.
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.
&&
LAT...LON 3976 7552 3992 7552 3994 7516 3990 7513
3989 7514 3987 7512 3987 7513
TIME...MOT...LOC 1845Z 271DEG 32KT 3983 7543
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...0.88 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH
$$
MPS567
WWUS51 KPHI 201908
SVSPHI
Severe Weather Statement
National Weather Service Mount Holly NJ
308 PM EDT Fri May 20 2022
DEC003-NJC015-PAC045-101-201917-
/O.EXP.KPHI.SV.W.0037.000000T0000Z-220520T1915Z/
New Castle DE-Gloucester NJ-Philadelphia PA-Delaware PA-
308 PM EDT Fri May 20 2022
...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN NEW CASTLE...
NORTHWESTERN GLOUCESTER...SOUTHWESTERN PHILADELPHIA AND SOUTHERN
DELAWARE COUNTIES WILL EXPIRE AT 315 PM EDT...
The storm which prompted the warning has moved out of the area.
Therefore, the warning will be allowed to expire. However small hail
and gusty winds are still possible with this thunderstorm.
A Tornado Watch remains in effect until 700 PM EDT for northern
Delaware...southern New Jersey...and southeastern Pennsylvania.
To report severe weather, contact your nearest law enforcement
agency. They will relay your report to the National Weather Service
Mount Holly NJ.
Remember, a Severe Thunderstorm Warning still remains in effect for
portions of Gloucester, Philadelphia, and Delaware counties.
LAT...LON 3976 7552 3992 7552 3994 7516 3990 7513
3989 7514 3987 7512 3987 7513
TIME...MOT...LOC 1907Z 242DEG 23KT 3989 7528
$$
MPSThe office that day
Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 20, 3:15 AM EDT | Heat Advisory | PHI | Bucks, Chester, Delaware, Montgomery, Philadelphia | 59 hr |
| May 20, 1:45 PM EDT | Severe Thunderstorm Warning | PHI | Berks, Chester, Montgomery | 45 min |
| May 20, 2:22 PM EDT | Severe Thunderstorm Warning | PHI | Berks, Bucks, Chester, Lehigh, Montgomery | 53 min |
| May 20, 2:30 PM EDT | Severe Thunderstorm Warning | PHI | Berks | 45 min |
| May 20, 2:53 PM EDT | Severe Thunderstorm Warning | PHI | Berks, Lehigh, Montgomery | 52 min |
| May 20, 3:00 PM EDT | Severe Thunderstorm Warning | PHI | Delaware, Philadelphia | 31 min |
| May 20, 3:05 PM EDT | Severe Thunderstorm Warning | PHI | Bucks, Montgomery | 29 min |
| May 20, 3:10 PM EDT | Severe Thunderstorm Warning | PHI | Berks, Bucks, Chester, Lehigh, Montgomery | 50 min |
| May 20, 3:25 PM EDT | Severe Thunderstorm Warning | PHI | Berks, Carbon, Lehigh, Monroe, Northampton | 50 min |
| May 20, 3:28 PM EDT | Special Weather Statement | PHI | Philadelphia | 32 min |
| May 20, 3:37 PM EDT | Severe Thunderstorm Warning | PHI | Bucks, Chester, Delaware, Montgomery, Philadelphia | 53 min |
| May 20, 3:41 PM EDT | Severe Thunderstorm Warning | PHI | Bucks, Lehigh, Montgomery, Northampton | 49 min |
| May 20, 3:52 PM EDT | Areal Flood Advisory | PHI | Bucks, Chester, Delaware, Lehigh, Montgomery, Philadelphia | 3 hr |
| May 20, 3:55 PM EDT | Areal Flood Advisory | PHI | Berks, Bucks, Carbon, Chester, Lehigh, Monroe and 2 more | 3 hr |
| May 20, 4:26 PM EDT | Areal Flood Advisory | PHI | Bucks, Philadelphia | 3 hr |
| May 20, 5:37 PM EDT | Areal Flood Warning | PHI | Bucks, Montgomery | 68 min |
| May 20, 12:30 PM EDT | Marine Dense Fog Advisory | PHI | 6 hr | |
| May 20, 3:48 PM EDT | Special Weather Statement | PHI | Monmouth | 27 min |
| May 20, 4:11 PM EDT | Special Weather Statement | PHI | Sussex | 34 min |
| May 20, 4:32 PM EDT | Special Weather Statement | PHI | Mercer, Middlesex | 28 min |
| May 20, 4:33 PM EDT | Severe Thunderstorm Warning | PHI | Burlington, Camden, Ocean | 42 min |
| May 20, 4:56 PM EDT | Special Weather Statement | PHI | Middlesex, Monmouth | 49 min |
| May 20, 5:11 PM EDT | Severe Thunderstorm Warning | PHI | Burlington, Camden, Ocean | 64 min |
| May 20, 5:15 PM EDT | Special Marine Warning | PHI | 45 min | |
| May 20, 5:20 PM EDT | Severe Thunderstorm Warning | PHI | Monmouth, Ocean | 27 min |
| May 20, 5:51 PM EDT | Special Marine Warning | PHI | 32 min | |
| May 20, 5:54 PM EDT | Severe Thunderstorm Warning | PHI | Ocean | 28 min |
Nearby
Severe Thunderstorm Warnings in Pennsylvania, 2022Severe Thunderstorm Warnings in New Jersey, 2022Severe Thunderstorm Warnings in Delaware, 2022Every severe thunderstorm warning in 2022
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.