Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2022

Severe Thunderstorm Warning 44, NWS Philadelphia/Mount Holly

May 20, 20225 counties in Pennsylvania; 5 counties in New Jersey; New Castle County, Delaware

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at May 20, 2022, 3:37 PM EDT for 5 counties in Pennsylvania; 5 counties in New Jersey; New Castle County, Delaware. It was in force for 53 min. 15 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, 3:37 PM EDT (19:37 UTC)
Expired: May 20, 2022, 4:30 PM EDT
In force: 53 min
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

Counties New Castle County, DE, Burlington County, NJ, Camden County, NJ, Gloucester County, NJ, Mercer County, NJ, Salem County, NJ, Bucks County, PA, Chester County, PA, Delaware County, PA, Montgomery County, PA, Philadelphia County, PA

The radar

The Philadelphia radar (KDIX), 73 km from the middle of the area, began a volume at 19:38 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, 3:53 PM EDT	HAIL 1	Woodlyn, PA
May 20, 3:58 PM EDT	TSTM WND DMG	1 Nw Chestnut Hill, PA	SOCIAL MEDIA PHOTO SHOWING A TREE DOWN INTO WIRES ON BELLS MILLS ROAD. ROAD IS BLOCKED. TIME ESTIMATED FROM RADAR.
May 20, 4:05 PM EDT	HAIL 1.25	Marlton, NJ
May 20, 4:07 PM EDT	HAIL 2.5	Cherry Hill Twp, NJ	VIA SOCIAL MEDIA PICTURE WITH MEASUREMENTS. TIME ESTIMATED FROM RADAR.
May 20, 4:18 PM EDT	TSTM WND DMG	1 Se Furlong, PA	TREES DOWN.
May 20, 4:27 PM EDT	HAIL 1	Cherry Hill, NJ	TIME ESTIMATED FROM RADAR.
May 20, 4:30 PM EDT	HAIL 1.5	1 Wnw Greentree, NJ	TIME ESTIMATED FROM RADAR.
May 20, 4:35 PM EDT	HAIL 0.88	Voorhees, NJ
May 20, 4:37 PM EDT	HAIL 1.5	Cherry Hill, NJ	PICTURE VIA SOCIAL MEDIA. TIME ESTIMATED VIA RADAR.
May 20, 4:37 PM EDT	HAIL 2.5	Cherry Hill Twp, NJ	CORRECTS PREVIOUS HAIL REPORT FROM CHERRY HILL TWP. VIA SOCIAL MEDIA PICTURE WITH MEASUREMENTS. TIME ESTIMATED FROM RADAR. EDIT FOR CORRECT TIME.
May 20, 4:40 PM EDT	HAIL 0.88	Marlton, NJ	TIME ESTIMATED FROM RADAR.
May 20, 4:40 PM EDT	HAIL 0.88	Marlton, NJ
May 20, 4:40 PM EDT	HAIL 1	Cherry Hill, NJ	TIME ESTIMATED FROM RADAR.
May 20, 4:40 PM EDT	HAIL 1.25	1 Se Ashland, NJ	HALF DOLLAR SIZED HAIL IN VOORHEES. TIME ESTIMATED FROM RADAR.
May 20, 4:40 PM EDT	HAIL 1.25	Cherry Hill, NJ	SOCIAL MEDIA IMAGE. TIME ESTIMATED VIA 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
May 20, 11:35 AM EDT	Tornado Watch	SPC	7 hr

The nearest sounding before it

Washington/Dulle, VA (KIAD), launched 12:00Z, 7.6 hours before the alert went out and 222 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.

Skew-T log-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.

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

Open this sounding in Storm Lab

The text

As transmitted.

353 
WUUS51 KPHI 201937
SVRPHI
DEC003-NJC005-007-015-021-033-PAC017-029-045-091-101-202030-
/O.NEW.KPHI.SV.W.0044.220520T1937Z-220520T2030Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Mount Holly NJ
337 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 Salem County in southern New Jersey...
  Northwestern Camden County in southern New Jersey...
  Central Mercer County in central New Jersey...
  Northwestern Gloucester County in southern New Jersey...
  Northwestern Burlington County in southern New Jersey...
  Montgomery County in southeastern Pennsylvania...
  Southeastern Bucks County in southeastern Pennsylvania...
  Eastern Chester County in southeastern Pennsylvania...
  Philadelphia County in southeastern Pennsylvania...
  Delaware County in southeastern Pennsylvania...

* Until 430 PM EDT.

* At 337 PM EDT, severe thunderstorms were located along a line
  extending from near East Norriton to Newtown Square to Talleyville,
  moving east at 45 mph.

  HAZARD...60 mph wind gusts and quarter size hail.

  SOURCE...Radar indicated.

  IMPACT...Minor damage to vehicles is possible. Wind damage to 
           roofs, siding, trees, and power lines is possible.

* Locations impacted include...
  Philadelphia, Trenton, Camden, Wilmington, West Chester, Gloucester
  City, Cherry Hill, Bensalem, Mount Laurel, Ewing, Norristown,
  Chester, Willingboro, Deptford, Voorhees, Pottstown, West Deptford,
  Glassboro, Lindenwold and Phoenixville.

This includes the following highways...
 New Jersey Turnpike between exits 2 and 6A.
 Pennsylvania Turnpike between mile markers 318 and 359.
 Northeast Extension between mile markers 21 and 31.
 Interstate 95 in Pennsylvania between mile markers 0 and 40.
 Interstate 95 in Delaware between mile markers 15 and 23.
 Interstate 76 in Pennsylvania between mile markers 327 and 351.
 Interstate 76 in New Jersey between mile markers 0 and 3.
 Interstate 295 in New Jersey between mile markers 8 and 51, and
between mile markers 65 and 76.
 Interstate 676 in Pennsylvania between mile markers 0 and 1.
 Interstate 676 in New Jersey between mile markers 0 and 4.
 Interstate 476 in Pennsylvania between mile markers 0 and 19.
 Atlantic City Expressway between mile markers 41 and 44.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Tornado Watch remains in effect until 700 PM EDT for northern
Delaware...southern and central New Jersey...and southeastern
Pennsylvania.

Prepare immediately for large hail and damaging winds. People outside
should move immediately to shelter inside a strong building. Stay
away from windows.

Torrential rainfall is occurring with these storms, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.

A Tornado Watch remains in effect until 700 PM EDT for northern
Delaware...southern and central New Jersey...and southeastern
Pennsylvania.

&&

LAT...LON 4036 7464 4003 7480 3970 7504 3976 7571
      3999 7560 4006 7556 4013 7569 4024 7564
TIME...MOT...LOC 1937Z 261DEG 39KT 4020 7535 3998 7543 3979 7555 

HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.00 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

Staarmann

3 follow-up statements

534 
WWUS51 KPHI 202000
SVSPHI

Severe Weather Statement
National Weather Service Mount Holly NJ
400 PM EDT Fri May 20 2022

DEC003-NJC033-PAC029-202010-
/O.CAN.KPHI.SV.W.0044.000000T0000Z-220520T2030Z/
New Castle DE-Salem NJ-Chester PA-
400 PM EDT Fri May 20 2022

...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN NEW CASTLE...
NORTHWESTERN SALEM AND EASTERN CHESTER COUNTIES IS CANCELLED...

The storms which prompted the warning have moved out of the warned 
area. Therefore, the warning has been cancelled.

A Tornado Watch remains in effect until 700 PM EDT for southern and
central New Jersey...and southeastern Pennsylvania.

LAT...LON 4036 7464 4003 7480 3970 7504 3982 7539
      3991 7544 4009 7535 4014 7542 4027 7541
TIME...MOT...LOC 2000Z 257DEG 37KT 4020 7530 4004 7519 3987 7530 

$$

NJC005-007-015-021-PAC017-045-091-101-202030-
/O.CON.KPHI.SV.W.0044.000000T0000Z-220520T2030Z/
Camden NJ-Mercer NJ-Gloucester NJ-Burlington NJ-Montgomery PA-
Bucks PA-Philadelphia PA-Delaware PA-
400 PM EDT Fri May 20 2022

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 430 PM EDT
FOR NORTHWESTERN CAMDEN...CENTRAL MERCER...NORTHWESTERN GLOUCESTER...
NORTHWESTERN BURLINGTON...SOUTHEASTERN MONTGOMERY...SOUTHEASTERN
BUCKS...PHILADELPHIA AND EASTERN DELAWARE COUNTIES...

At 400 PM EDT, severe thunderstorms were located along a line
extending from near Lansdale to Germantown to Philadelphia
International Arpt, moving east at 45 mph.

HAZARD...60 mph wind gusts and half dollar size hail.

SOURCE...Radar indicated.

IMPACT...Minor damage to vehicles is possible. Wind damage to roofs, 
         siding, trees, and power lines is possible.

Locations impacted include...
Philadelphia, Trenton, Camden, Gloucester City, Cherry Hill,
Bensalem, Mount Laurel, Ewing, Norristown, Chester, Willingboro,
Deptford, Voorhees, West Deptford, Glassboro, Lindenwold, Lansdale,
West Norriton, East Norriton and Princeton.

This includes the following highways...
 New Jersey Turnpike between exits 3 and 6A.
 Pennsylvania Turnpike between mile markers 330 and 359.
 Northeast Extension between mile markers 21 and 32.
 Interstate 95 in Pennsylvania between mile markers 4 and 40.
 Interstate 76 in Pennsylvania between mile markers 330 and 351.
 Interstate 76 in New Jersey between mile markers 0 and 3.
 Interstate 295 in New Jersey between mile markers 14 and 51, and
between mile markers 65 and 76.
 Interstate 676 in Pennsylvania between mile markers 0 and 1.
 Interstate 676 in New Jersey between mile markers 0 and 4.
 Interstate 476 in Pennsylvania between mile markers 0 and 19.
 Atlantic City Expressway between mile markers 41 and 44.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Tornado Watch remains in effect until 700 PM EDT for southern and
central New Jersey...and southeastern Pennsylvania.

Prepare immediately for large hail and damaging winds. People outside
should seek shelter inside a well-built structure and away from
windows.

Torrential rainfall is occurring with these storms, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.

&&

LAT...LON 4036 7464 4003 7480 3970 7504 3982 7539
      3991 7544 4009 7535 4014 7542 4027 7541
TIME...MOT...LOC 2000Z 257DEG 37KT 4020 7530 4004 7519 3987 7530 

HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.25 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

Staarmann

014 
WWUS51 KPHI 202012
SVSPHI

Severe Weather Statement
National Weather Service Mount Holly NJ
412 PM EDT Fri May 20 2022

NJC005-007-015-021-PAC017-045-091-101-202030-
/O.CON.KPHI.SV.W.0044.000000T0000Z-220520T2030Z/
Camden NJ-Mercer NJ-Gloucester NJ-Burlington NJ-Montgomery PA-
Bucks PA-Philadelphia PA-Delaware PA-
412 PM EDT Fri May 20 2022

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 430 PM EDT
FOR NORTHWESTERN CAMDEN...CENTRAL MERCER...NORTH CENTRAL
GLOUCESTER...NORTHWESTERN BURLINGTON...SOUTHEASTERN MONTGOMERY...
SOUTHEASTERN BUCKS...PHILADELPHIA AND EAST CENTRAL DELAWARE
COUNTIES...

At 412 PM EDT, severe thunderstorms were located along a line
extending from near Ivyland to Riverside to Westville, moving east at
45 mph.

HAZARD...60 mph wind gusts and quarter size hail.

SOURCE...Radar indicated.

IMPACT...Minor damage to vehicles is possible. Wind damage to roofs, 
         siding, trees, and power lines is possible.

Locations impacted include...
Philadelphia, Trenton, Camden, Gloucester City, Cherry Hill,
Bensalem, Mount Laurel, Ewing, Willingboro, Deptford, Voorhees, West
Deptford, Lindenwold, Princeton, Florence, Bellmawr, Yeadon,
Woodbury, Burlington and Bristol.

This includes the following highways...
 New Jersey Turnpike between exits 3 and 6A.
 Pennsylvania Turnpike between mile markers 340 and 359.
 Interstate 95 in Pennsylvania between mile markers 11 and 40.
 Interstate 76 in Pennsylvania between mile markers 339 and 351.
 Interstate 76 in New Jersey between mile markers 0 and 3.
 Interstate 295 in New Jersey between mile markers 21 and 51, and
between mile markers 65 and 76.
 Interstate 676 in Pennsylvania between mile markers 0 and 1.
 Interstate 676 in New Jersey between mile markers 0 and 4.
 Atlantic City Expressway near mile marker 44.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Tornado Watch remains in effect until 700 PM EDT for southern and
central New Jersey...and southeastern Pennsylvania.

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 4036 7464 4003 7480 3976 7500 3985 7526
      3994 7526 4012 7517 4019 7523 4029 7524
TIME...MOT...LOC 2012Z 261DEG 41KT 4023 7515 4005 7499 3989 7516 

HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.00 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

Staarmann

223 
WWUS51 KPHI 202024
SVSPHI

Severe Weather Statement
National Weather Service Mount Holly NJ
424 PM EDT Fri May 20 2022

NJC015-PAC045-091-202033-
/O.CAN.KPHI.SV.W.0044.000000T0000Z-220520T2030Z/
Gloucester NJ-Montgomery PA-Delaware PA-
424 PM EDT Fri May 20 2022

...THE SEVERE THUNDERSTORM WARNING FOR NORTH CENTRAL GLOUCESTER...
SOUTHEASTERN MONTGOMERY AND EAST CENTRAL DELAWARE COUNTIES IS
CANCELLED...

The storms which prompted the warning have moved out of the warned 
area. Therefore, the warning has been cancelled.

A Tornado Watch remains in effect until 700 PM EDT for southern and
central New Jersey...and southeastern Pennsylvania.

LAT...LON 4003 7480 3980 7497 3984 7509 3989 7514
      3989 7517 3990 7513 3996 7513 3998 7507
      4002 7504 4002 7501 4008 7496 4012 7496
      4014 7502 4022 7508 4031 7507 4036 7464
TIME...MOT...LOC 2023Z 260DEG 39KT 4027 7498 4007 7484 3991 7501 

$$

NJC005-007-021-PAC017-101-202030-
/O.CON.KPHI.SV.W.0044.000000T0000Z-220520T2030Z/
Camden NJ-Mercer NJ-Burlington NJ-Bucks PA-Philadelphia PA-
424 PM EDT Fri May 20 2022

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 430 PM EDT
FOR NORTHWESTERN CAMDEN...CENTRAL MERCER...NORTHWESTERN BURLINGTON...
SOUTHEASTERN BUCKS AND CENTRAL PHILADELPHIA COUNTIES...

At 423 PM EDT, severe thunderstorms were located along a line
extending from near Richboro to Burlington to Erlton-Ellisburg,
moving east at 45 mph.

HAZARD...60 mph wind gusts and quarter size hail.

SOURCE...Radar indicated.

IMPACT...Minor damage to vehicles is possible. Wind damage to roofs, 
         siding, trees, and power lines is possible.

Locations impacted include...
Philadelphia, Trenton, Camden, Gloucester City, Cherry Hill,
Bensalem, Mount Laurel, Ewing, Willingboro, Voorhees, Lindenwold,
Princeton, Florence, Bellmawr, Burlington, Bristol, Riverside,
Palmyra, Magnolia and Westville.

This includes the following highways...
 New Jersey Turnpike between exits 3 and 6A.
 Pennsylvania Turnpike between mile markers 348 and 359.
 Interstate 95 in Pennsylvania between mile markers 34 and 40.
 Interstate 76 in New Jersey between mile markers 0 and 3.
 Interstate 295 in New Jersey between mile markers 26 and 51, and
between mile markers 65 and 76.
 Interstate 676 in New Jersey between mile markers 0 and 4.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Tornado Watch remains in effect until 700 PM EDT for southern and
central New Jersey...and southeastern Pennsylvania.

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 4003 7480 3980 7497 3984 7509 3989 7514
      3989 7517 3990 7513 3996 7513 3998 7507
      4002 7504 4002 7501 4008 7496 4012 7496
      4014 7502 4022 7508 4031 7507 4036 7464
TIME...MOT...LOC 2023Z 260DEG 39KT 4027 7498 4007 7484 3991 7501 

HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.00 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

Staarmann

The 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, 2:27 PM EDT	Severe Thunderstorm Warning	PHI	Chester, Delaware, Montgomery, Philadelphia	48 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, 3:41 PM EDT	Severe Thunderstorm Warning Considerable damage threat	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 Considerable damage threat	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, 2022 Severe Thunderstorm Warnings in New Jersey, 2022 Severe Thunderstorm Warnings in Delaware, 2022 Every 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.