Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2020

Severe Thunderstorm Warning 68, NWS Philadelphia/Mount Holly

June 4, 2020New Castle County, Delaware; Burlington County, Camden County, Gloucester County, New Jersey; 5 counties in Pennsylvania

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Jun 4, 2020, 10:31 PM EDT for New Castle County, Delaware; Burlington County, Camden County, Gloucester County, New Jersey; 5 counties in Pennsylvania. It was in force for 46 min. 9 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: Jun 4, 2020, 10:31 PM EDT (02:31 UTC)
Expired: Jun 4, 2020, 11:17 PM EDT
In force: 46 min
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

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

The radar

The Philadelphia radar (KDIX), 66 km from the middle of the area, began a volume at 02:31 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
Jun 4, 10:40 PM EDT	TSTM WND DMG	Parkside, PA	CORRECTS TIME OF PREVIOUS TSTM WND DMG REPORT FROM PARKSIDE. WIRES DOWN ON SCHOOLHOUSE LN. TIME ESTIMATED FROM RADAR.
Jun 4, 10:40 PM EDT	TSTM WND DMG	Swarthmore, PA	CORRECTS TIME OF PREVIOUS TSTM WND DMG REPORT FROM SWARTHMORE. WIRES DOWN ON YALE AVE. TIME ESTIMATED FROM RADAR.
Jun 4, 10:45 PM EDT	TSTM WND DMG	Lima, PA	WIRES DOWN ON COUNTRY VILLAGE WAY. TIME ESTIMATED FROM RADAR.
Jun 4, 10:47 PM EDT	TSTM WND DMG	1 Wnw Media, PA	CORRECTS TIME OF PREVIOUS TSTM WND DMG REPORT FROM 1 WNW MEDIA. WIRES DOWN ON N RIDLEY CREEK RD. TIME ESTIMATED FROM RADAR.
Jun 4, 10:55 PM EDT	TSTM WND DMG	1 Nw Darby, PA	WIRES WERE DOWNED ON GOLF BLVD. TIME ESTIMATED FROM RADAR.
Jun 4, 11:08 PM EDT	TSTM WND DMG	Lawnside, NJ	DOWNED TREE ON I-295 SOUTHBOUND AT EXIT 30, PARTIALLY BLOCKING THE RAMP. TIME ESTIMATED FROM RADAR.
Jun 4, 11:10 PM EDT	TSTM WND DMG	Oaklyn, NJ	POWER LINES WERE DOWNED IN OAKLYN. TIME ESTIMATED FROM RADAR.
Jun 4, 11:15 PM EDT	TSTM WND DMG	Cherry Hill, NJ	SEVERAL REPORTS OF DOWNED TREES AND WIRES IN CHERRY HILL. TIME ESTIMATED FROM RADAR.
Jun 4, 11:25 PM EDT	TSTM WND DMG	Willingboro, NJ	SEVERAL REPORTS OF DOWNED WIRES IN WILLINGBORO. 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

Brookhaven, NY (KOKX), launched 00:00Z, 2.5 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.

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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 1607 m above ground
0-6 km bulk shear: 40 kt
0-1 km storm-relative helicity: 110 m²/s²
0-3 km storm-relative helicity: 153 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

911 
WUUS51 KPHI 050231
SVRPHI
DEC003-NJC005-007-015-PAC017-029-045-091-101-050330-
/O.NEW.KPHI.SV.W.0068.200605T0231Z-200605T0330Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Mount Holly NJ
1031 PM EDT Thu Jun 4 2020

The National Weather Service in Mount Holly NJ has issued a

* Severe Thunderstorm Warning for...
  Northeastern New Castle County in northern Delaware...
  Northwestern Camden County in southern New Jersey...
  Northwestern Gloucester County in southern New Jersey...
  Northwestern Burlington County in southern New Jersey...
  Montgomery County in southeastern Pennsylvania...
  Bucks County in southeastern Pennsylvania...
  Eastern Chester County in southeastern Pennsylvania...
  Philadelphia County in southeastern Pennsylvania...
  Delaware County in southeastern Pennsylvania...

* Until 1130 PM EDT.

* At 1030 PM EDT, severe thunderstorms were located along a line
  extending from near Cedarville to near West Chester to near
  Talleyville, moving northeast 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...
  Philadelphia, Camden, Wilmington, West Chester, Gloucester City,
  Cherry Hill, Bensalem, Mount Laurel, Norristown, Chester,
  Willingboro, Pottstown, West Deptford, Phoenixville, Lansdale, West
  Norriton, East Norriton, Lumberton, Florence and Bellmawr.

This includes the following highways...
 Interstate 295 in New Jersey between mile markers 19 and 55.
 Interstate 95 in Pennsylvania between mile markers 0 and 40.
 New Jersey Turnpike between exits 3 and 6A.
 Interstate 95 in Delaware between mile markers 15 and 23.
 Interstate 476 in Pennsylvania between mile markers 0 and 19.
 Pennsylvania Turnpike between exits 312 and 353.
 Northeast Extension between exits A20 and A31.
 Interstate 676 in New Jersey between mile markers 0 and 4.
 Interstate 676 in Pennsylvania between mile markers 0 and 1.
 Interstate 76 in New Jersey between mile markers 0 and 3.
 Interstate 76 in Pennsylvania between mile markers 327 and 351.

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.

In addition to damaging winds, frequent cloud to ground lightning is 
occurring with these storms. Move indoors immediately. Remember, if 
you can hear thunder, you are close enough to be struck by lightning.

&&

LAT...LON 3999 7460 3989 7494 3973 7563 3989 7566
      4018 7578 4050 7512 4044 7506 4042 7506
      4041 7502
TIME...MOT...LOC 0230Z 226DEG 36KT 4020 7564 3999 7554 3979 7552 

HAIL...<.75IN
WIND...60MPH
 
$$

Gorse

3 follow-up statements

340 
WWUS51 KPHI 050244
SVSPHI

Severe Weather Statement
National Weather Service Mount Holly NJ
1044 PM EDT Thu Jun 4 2020

DEC003-NJC005-007-015-PAC017-029-045-091-101-050330-
/O.CON.KPHI.SV.W.0068.000000T0000Z-200605T0330Z/
New Castle DE-Camden NJ-Gloucester NJ-Burlington NJ-Montgomery PA-
Bucks PA-Chester PA-Philadelphia PA-Delaware PA-
1044 PM EDT Thu Jun 4 2020

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1130 PM EDT
FOR NORTHEASTERN NEW CASTLE...NORTHWESTERN CAMDEN...NORTHWESTERN
GLOUCESTER...NORTHWESTERN BURLINGTON...MONTGOMERY...BUCKS...
NORTHEASTERN CHESTER...PHILADELPHIA AND DELAWARE COUNTIES...

At 1043 PM EDT, severe thunderstorms were located along a line
extending from near Spring Mount to near Valley Forge to Chester 
Township, moving northeast at 40 mph. Radar data shows an area of 
more focused damaging winds moving into far northern Delaware County.

HAZARD...60 mph wind gusts.

SOURCE...Radar indicated.

IMPACT...Damage to roofs, siding, trees, and power lines is 
         possible.

Locations impacted include...
Philadelphia, Camden, Wilmington, Gloucester City, Cherry Hill,
Bensalem, Mount Laurel, Norristown, Chester, Willingboro, Pottstown,
West Deptford, Phoenixville, Lansdale, West Norriton, East Norriton,
Lumberton, Florence, Bellmawr and Yeadon.

This includes the following highways...
 Interstate 295 in New Jersey between mile markers 20 and 55.
 Interstate 95 in Pennsylvania between mile markers 0 and 40.
 New Jersey Turnpike between exits 4 and 6A.
 Interstate 95 in Delaware between mile markers 15 and 23.
 Interstate 476 in Pennsylvania between mile markers 0 and 19.
 Pennsylvania Turnpike between exits 320 and 353.
 Northeast Extension between exits A20 and A31.
 Interstate 676 in New Jersey between mile markers 0 and 4.
 Interstate 676 in Pennsylvania between mile markers 0 and 1.
 Interstate 76 in New Jersey between mile markers 0 and 3.
 Interstate 76 in Pennsylvania between mile markers 327 and 351.

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.

Frequent cloud to ground lightning is occurring with these storms.
Move indoors immediately. Lightning is one of nature's leading
killers. Remember, if you can hear thunder, you are close enough to
be struck by lightning.

&&

LAT...LON 3999 7460 3989 7494 3975 7557 3992 7552
      4026 7562 4050 7512 4044 7506 4042 7506
      4041 7502
TIME...MOT...LOC 0243Z 226DEG 36KT 4028 7553 4007 7543 3987 7541 

HAIL...<.75IN
WIND...60MPH
 
$$

Gorse

464 
WWUS51 KPHI 050255
SVSPHI

Severe Weather Statement
National Weather Service Mount Holly NJ
1055 PM EDT Thu Jun 4 2020

DEC003-PAC029-050304-
/O.CAN.KPHI.SV.W.0068.000000T0000Z-200605T0330Z/
New Castle DE-Chester PA-
1055 PM EDT Thu Jun 4 2020

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

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

LAT...LON 3999 7460 3989 7494 3979 7541 3978 7544
      3981 7543 4004 7541 4007 7536 4006 7539
      4009 7542 4010 7544 4022 7550 4037 7498
TIME...MOT...LOC 0254Z 251DEG 36KT 4026 7536 4005 7526 3985 7528 

$$

NJC005-007-015-PAC017-045-091-101-050330-
/O.CON.KPHI.SV.W.0068.000000T0000Z-200605T0330Z/
Camden NJ-Gloucester NJ-Burlington NJ-Montgomery PA-Bucks PA-
Philadelphia PA-Delaware PA-
1055 PM EDT Thu Jun 4 2020

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1130 PM EDT
FOR NORTHWESTERN CAMDEN...NORTHWESTERN GLOUCESTER...NORTHWESTERN
BURLINGTON...SOUTHEASTERN MONTGOMERY...SOUTHEASTERN BUCKS...
PHILADELPHIA AND DELAWARE COUNTIES...

At 1054 PM EDT, severe thunderstorms were located along a line
extending from near Hatfield to near Chestnut Hill to Tinicum
Township, moving east 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...
Philadelphia, Camden, Gloucester City, Cherry Hill, Bensalem, Mount
Laurel, Norristown, Chester, Willingboro, Lansdale, West Norriton,
East Norriton, Lumberton, Florence, Bellmawr, Yeadon, Woodbury,
Burlington, Bristol and Mount Holly.

This includes the following highways...
 Interstate 295 in New Jersey between mile markers 20 and 55.
 Interstate 95 in Pennsylvania between mile markers 2 and 40.
 New Jersey Turnpike between exits 4 and 6A.
 Interstate 476 in Pennsylvania between mile markers 0 and 19.
 Pennsylvania Turnpike between exits 326 and 353.
 Northeast Extension between exits A20 and A31.
 Interstate 676 in New Jersey between mile markers 0 and 4.
 Interstate 676 in Pennsylvania between mile markers 0 and 1.
 Interstate 76 in New Jersey between mile markers 0 and 3.
 Interstate 76 in Pennsylvania between mile markers 327 and 351.

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.

Frequent cloud to ground lightning is occurring with these storms.
Move indoors immediately. Lightning is one of nature's leading
killers. Remember, if you can hear thunder, you are close enough to
be struck by lightning.

&&

LAT...LON 3999 7460 3989 7494 3979 7541 3978 7544
      3981 7543 4004 7541 4007 7536 4006 7539
      4009 7542 4010 7544 4022 7550 4037 7498
TIME...MOT...LOC 0254Z 251DEG 36KT 4026 7536 4005 7526 3985 7528 

HAIL...<.75IN
WIND...60MPH
 
$$

Gorse

039 
WWUS51 KPHI 050317
SVSPHI

Severe Weather Statement
National Weather Service Mount Holly NJ
1117 PM EDT Thu Jun 4 2020

NJC005-007-015-PAC017-045-091-101-050327-
/O.CAN.KPHI.SV.W.0068.000000T0000Z-200605T0330Z/
Camden NJ-Gloucester NJ-Burlington NJ-Montgomery PA-Bucks PA-
Philadelphia PA-Delaware PA-
1117 PM EDT Thu Jun 4 2020

...THE SEVERE THUNDERSTORM WARNING FOR NORTHWESTERN CAMDEN...
NORTHWESTERN GLOUCESTER...NORTHWESTERN BURLINGTON...SOUTHEASTERN
MONTGOMERY...SOUTHEASTERN BUCKS...PHILADELPHIA AND DELAWARE COUNTIES
IS CANCELLED...
            
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 has been cancelled.  However gusty winds and
heavy rain are still possible with these thunderstorms.

LAT...LON 3999 7460 3989 7494 3979 7541 3978 7544
      3981 7543 4004 7541 4007 7536 4006 7539
      4009 7542 4010 7544 4022 7550 4037 7498
TIME...MOT...LOC 0315Z 226DEG 36KT 4041 7516 4020 7506 4000 7508 

$$

Gorse

The office that day

Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jun 4, 9:54 PM EDT	Special Weather Statement	PHI	New Castle	36 min
Jun 4, 10:12 PM EDT	Severe Thunderstorm Warning	PHI	Kent, New Castle	33 min
Jun 4, 10:32 PM EDT	Severe Thunderstorm Warning	PHI	Kent, New Castle	42 min
Jun 5, 9:47 AM EDT	Flash Flood Watch	PHI	New Castle	12 hr
Jun 5, 5:19 PM EDT	Areal Flood Advisory	PHI	New Castle	4 hr
Jun 4, 10:07 PM EDT	Special Marine Warning	PHI		53 min
Jun 4, 10:52 PM EDT	Special Marine Warning	PHI		38 min
Jun 4, 10:59 PM EDT	Severe Thunderstorm Warning	PHI	Atlantic, Burlington, Camden, Cape May, Cumberland, Gloucester and 1 more	34 min
Jun 5, 12:06 AM EDT	Special Marine Warning	PHI		54 min
Jun 5, 3:24 PM EDT	Special Weather Statement	PHI	Mercer, Middlesex, Monmouth	36 min
Jun 5, 3:57 PM EDT	Special Weather Statement	PHI	Mercer, Middlesex, Monmouth	33 min
Jun 5, 4:36 PM EDT	Special Weather Statement	PHI	Monmouth	24 min
Jun 5, 4:55 PM EDT	Special Weather Statement	PHI	Monmouth, Ocean	50 min
Jun 5, 5:01 PM EDT	Areal Flood Advisory	PHI	Burlington, Mercer, Middlesex, Monmouth, Ocean, Somerset	4 hr
Jun 5, 5:27 PM EDT	Flash Flood Warning	PHI	Monmouth, Ocean	3 hr
Jun 4, 10:05 PM EDT	Special Weather Statement	PHI	Chester, Delaware, Montgomery, Philadelphia	40 min
Jun 4, 10:46 PM EDT	Areal Flood Advisory	PHI	Berks, Carbon, Lehigh, Monroe, Northampton	119 min
Jun 5, 3:15 PM EDT	Special Weather Statement	PHI	Bucks, Montgomery	30 min
Jun 5, 3:48 PM EDT	Areal Flood Advisory	PHI	Bucks, Chester, Delaware, Montgomery, Philadelphia	3 hr
Jun 5, 4:14 PM EDT	Special Weather Statement	PHI	Berks	16 min

Nearby

Severe Thunderstorm Warnings in Pennsylvania, 2020 Severe Thunderstorm Warnings in New Jersey, 2020 Severe Thunderstorm Warnings in Delaware, 2020 Every 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.