Alert archive / New Jersey / Severe Thunderstorm Warnings in 2020

Severe Thunderstorm Warning 186, NWS Philadelphia/Mount Holly

July 30, 2020Delaware County, Montgomery County, Philadelphia County, Pennsylvania; 6 counties in New Jersey

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Jul 30, 2020, 11:06 PM EDT for Delaware County, Montgomery County, Philadelphia County, Pennsylvania; 6 counties in New Jersey. It was in force for 39 min. 5 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: Jul 30, 2020, 11:06 PM EDT (03:06 UTC)
Expired: Jul 30, 2020, 11:45 PM EDT
In force: 39 min
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

Counties Atlantic County, NJ, Burlington County, NJ, Camden County, NJ, Cumberland County, NJ, Gloucester County, NJ, Salem County, NJ, Delaware County, PA, Montgomery County, PA, Philadelphia County, PA

The radar

The Philadelphia radar (KDIX), 60 km from the middle of the area, began a volume at 03:09 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 30, 11:07 PM EDT	TSTM WND DMG	1 Nnw Fairview, NJ	SEVERAL REPORTS OF POWER LINES DOWN IN THE FAIRVIEW AND JERICHO AREA. TIME ESTIMATED FROM RADAR.
Jul 30, 11:11 PM EDT	TSTM WND DMG	1 Wsw Glassboro, NJ	WIRES DOWN NEAR PENNSYLVANIA AVENUE IN GLASSBORO. TIME ESTIMATED FROM RADAR.
Jul 30, 11:14 PM EDT	TSTM WND DMG	1 Nne Gloucester Twp, NJ	DOWNED WIRES ON SIGNEY LANE. TIME ESTIMATED FROM RADAR.
Jul 30, 11:16 PM EDT	TSTM WND DMG	1 Ne Barrington, NJ	DOWNED WIRES NEAR WHITMAN DRIVE. TIME ESTIMATED FROM RADAR.
Jul 30, 11:37 PM EDT	TSTM WND DMG	1 E Delran, NJ	WIRES DOWN NEAR CREEK 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

Brookhaven, NY (KOKX), launched 00:00Z, 3.1 hours before the alert went out and 217 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: 2515 J/kg
Mixed-layer CIN: -27 J/kg
Mixed-layer LCL: 895 m above ground
0-6 km bulk shear: 34 kt
0-1 km storm-relative helicity: 79 m²/s²
0-3 km storm-relative helicity: 102 m²/s²
Significant tornado parameter: 0.8
Supercell composite: 4.9

Open this sounding in Storm Lab

The text

As transmitted.

257 
WUUS51 KPHI 310306
SVRPHI
NJC001-005-007-011-015-033-PAC045-091-101-310345-
/O.NEW.KPHI.SV.W.0186.200731T0306Z-200731T0345Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Mount Holly NJ
1106 PM EDT Thu Jul 30 2020

The National Weather Service in Mount Holly NJ has issued a

* Severe Thunderstorm Warning for...
  Northwestern Atlantic County in southern New Jersey...
  North central Cumberland County in southern New Jersey...
  East central Salem County in southern New Jersey...
  Camden County in southern New Jersey...
  Gloucester County in southern New Jersey...
  Western Burlington County in southern New Jersey...
  Southeastern Montgomery County in southeastern Pennsylvania...
  Philadelphia County in southeastern Pennsylvania...
  Delaware County in southeastern Pennsylvania...

* Until 1145 PM EDT.

* At 1105 PM EDT, severe thunderstorms were located along a line
  extending from near Broomall to near Millville, moving northeast at
  30 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, Vineland, Gloucester City, Cherry Hill,
  Evesham, Mount Laurel, Chester, Deptford, Voorhees, Medford, West
  Deptford, Glassboro, Lindenwold, Hammonton, Bellmawr, Yeadon,
  Woodbury, Pitman and Clayton.

This includes the following highways...
 New Jersey Turnpike between exits 2 and 4.
 Interstate 95 in Pennsylvania between mile markers 0 and 33.
 Interstate 76 in Pennsylvania between mile markers 335 and 351.
 Interstate 76 in New Jersey between mile markers 0 and 3.
 Interstate 295 in New Jersey between mile markers 10 and 43.
 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 12.
 Atlantic City Expressway between mile markers 28 and 44.

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.

&&

LAT...LON 3968 7464 3948 7515 3980 7541 3982 7546
      3993 7553 3998 7544 4000 7543 4016 7506
      4011 7496 4008 7496 4006 7498 4005 7497
      4007 7492
TIME...MOT...LOC 0305Z 246DEG 27KT 3994 7539 3937 7502 

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

JEO

2 follow-up statements

994 
WWUS51 KPHI 310323
SVSPHI

Severe Weather Statement
National Weather Service Mount Holly NJ
1123 PM EDT Thu Jul 30 2020

NJC011-033-310332-
/O.CAN.KPHI.SV.W.0186.000000T0000Z-200731T0345Z/
Cumberland NJ-Salem NJ-
1123 PM EDT Thu Jul 30 2020

...THE SEVERE THUNDERSTORM WARNING FOR NORTH CENTRAL CUMBERLAND AND
EAST CENTRAL SALEM COUNTIES IS CANCELLED...

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

LAT...LON 3968 7464 3956 7500 3956 7506 3958 7509
      4001 7538 4016 7506 4011 7496 4008 7496
      4006 7498 4005 7497 4007 7492
TIME...MOT...LOC 0322Z 246DEG 27KT 3998 7527 3941 7490 

$$

NJC001-005-007-015-PAC045-091-101-310345-
/O.CON.KPHI.SV.W.0186.000000T0000Z-200731T0345Z/
Atlantic NJ-Camden NJ-Gloucester NJ-Burlington NJ-Montgomery PA-
Philadelphia PA-Delaware PA-
1123 PM EDT Thu Jul 30 2020

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1145 PM EDT
FOR NORTHWESTERN ATLANTIC...CAMDEN...GLOUCESTER...WESTERN
BURLINGTON...SOUTHEASTERN MONTGOMERY...PHILADELPHIA AND NORTHEASTERN
DELAWARE COUNTIES...

At 1122 PM EDT, severe thunderstorms were located along a line
extending from Morris Park to near Cumberland, moving northeast at 30
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, Evesham, Mount
Laurel, Deptford, Voorhees, Medford, West Deptford, Glassboro,
Lindenwold, Hammonton, Bellmawr, Yeadon, Woodbury, Pitman, Clayton,
Riverside and Berlin.

This includes the following highways...
 New Jersey Turnpike between exits 3 and 4.
 Interstate 95 in Pennsylvania between mile markers 10 and 33.
 Interstate 76 in Pennsylvania between mile markers 335 and 351.
 Interstate 76 in New Jersey between mile markers 0 and 3.
 Interstate 295 in New Jersey between mile markers 18 and 43.
 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 7 and 11.
 Atlantic City Expressway between mile markers 29 and 44.

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.

&&

LAT...LON 3968 7464 3956 7500 3956 7506 3958 7509
      4001 7538 4016 7506 4011 7496 4008 7496
      4006 7498 4005 7497 4007 7492
TIME...MOT...LOC 0322Z 246DEG 27KT 3998 7527 3941 7490 

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

JEO

848 
WWUS51 KPHI 310336
SVSPHI

Severe Weather Statement
National Weather Service Mount Holly NJ
1136 PM EDT Thu Jul 30 2020

NJC001-005-007-015-PAC045-091-101-310345-
/O.EXP.KPHI.SV.W.0186.000000T0000Z-200731T0345Z/
Atlantic NJ-Camden NJ-Gloucester NJ-Burlington NJ-Montgomery PA-
Philadelphia PA-Delaware PA-
1136 PM EDT Thu Jul 30 2020

...THE SEVERE THUNDERSTORM WARNING FOR NORTHWESTERN ATLANTIC...
CAMDEN...GLOUCESTER...WESTERN BURLINGTON...SOUTHEASTERN MONTGOMERY...
PHILADELPHIA AND NORTHEASTERN DELAWARE COUNTIES WILL EXPIRE AT 1145
PM EDT...
    
The storms which prompted the warning have moved out of the area.
Therefore, the warning will be allowed to expire.

LAT...LON 3968 7464 3956 7500 3956 7506 3958 7509
      4001 7538 4016 7506 4011 7496 4008 7496
      4006 7498 4005 7497 4007 7492
TIME...MOT...LOC 0335Z 246DEG 27KT 4001 7518 3944 7481 

$$

JEO

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 30, 10:11 PM EDT	Special Weather Statement	PHI	Chester, Delaware	49 min
Jul 30, 10:35 PM EDT	Special Weather Statement	PHI	Delaware, Montgomery	40 min
Jul 30, 10:55 PM EDT	Special Weather Statement	PHI	Delaware, Philadelphia	50 min
Jul 30, 11:27 PM EDT	Severe Thunderstorm Warning	PHI	Bucks, Montgomery	33 min
Jul 30, 11:35 PM EDT	Severe Thunderstorm Warning	PHI	Bucks, Philadelphia	40 min
Jul 30, 11:51 PM EDT	Severe Thunderstorm Warning	PHI	Berks, Bucks, Chester, Lehigh, Montgomery, Northampton	54 min
Jul 31, 12:10 AM EDT	Severe Thunderstorm Warning	PHI	Bucks	50 min
Jul 31, 12:21 AM EDT	Areal Flood Advisory	PHI	Berks, Bucks, Lehigh, Montgomery	4 hr
Jul 30, 10:15 PM EDT	Special Marine Warning	PHI		60 min
Jul 30, 10:36 PM EDT	Special Weather Statement	PHI	Atlantic, Camden, Cumberland, Gloucester, Salem	39 min
Jul 30, 11:40 PM EDT	Special Weather Statement	PHI	Hunterdon	50 min
Jul 31, 12:33 AM EDT	Severe Thunderstorm Warning	PHI	Hunterdon, Mercer, Middlesex, Monmouth, Morris, Ocean and 1 more	42 min
Jul 31, 12:54 AM EDT	Areal Flood Advisory	PHI	Hunterdon, Mercer, Middlesex, Monmouth, Somerset	4 hr
Jul 31, 1:10 AM EDT	Severe Thunderstorm Warning	PHI	Middlesex, Monmouth, Morris, Somerset	35 min
Jul 31, 1:29 AM EDT	Flash Flood Warning	PHI	Middlesex, Somerset	4 hr

Nearby

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