Alert archive / New Jersey / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 213, NWS Philadelphia/Mount Holly

July 21, 2021Burlington County, Camden County, Gloucester County, New Jersey

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Jul 21, 2021, 3:04 PM EDT for Burlington County, Camden County, Gloucester County, New Jersey. It was in force for 56 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 21, 2021, 3:04 PM EDT (19:04 UTC)
Expired: Jul 21, 2021, 4:00 PM EDT
In force: 56 min
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

Counties Burlington County, NJ, Camden County, NJ, Gloucester County, NJ

The radar

The Philadelphia radar (KDIX), 52 km from the middle of the area, began a volume at 19:05 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 21, 3:05 PM EDT	TSTM WND DMG	Audubon, NJ	LARGE BRANCH DOWN ON FENCE IN AUDUBON, PHOTO RELAYED VIA SOCIAL MEDIA. TIME ESTIMATED FROM RADAR.
Jul 21, 3:20 PM EDT	HAIL 1	1 N Stratford, NJ	AT LAUREL SPRINGS.
Jul 21, 3:20 PM EDT	HAIL 1	Gloucester Twp, NJ
Jul 21, 4:00 PM EDT	HAIL 0.88	West Deptford Twp, NJ
Jul 21, 4:05 PM EDT	HAIL 0.7	Deptford Twp, NJ

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 21, 11:56 AM EDT	Severe Thunderstorm Watch	SPC	7 hr

The nearest sounding before it

Brookhaven, NY (KOKX), launched 12:00Z, 7.1 hours before the alert went out and 214 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: 130 J/kg
Mixed-layer CIN: -165 J/kg
Mixed-layer LCL: 1495 m above ground
0-6 km bulk shear: 35 kt
0-1 km storm-relative helicity: 22 m²/s²
0-3 km storm-relative helicity: 48 m²/s²
Significant tornado parameter: 0.0
Supercell composite: -0.0

Open this sounding in Storm Lab

The text

As transmitted.

257 
WUUS51 KPHI 211904
SVRPHI
NJC005-007-015-212000-
/O.NEW.KPHI.SV.W.0213.210721T1904Z-210721T2000Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Mount Holly NJ
304 PM EDT Wed Jul 21 2021

The National Weather Service in Mount Holly NJ has issued a

* Severe Thunderstorm Warning for...
  Camden County in southern New Jersey...
  North central Gloucester County in southern New Jersey...
  West central Burlington County in southern New Jersey...

* Until 400 PM EDT.

* At 303 PM EDT, a severe thunderstorm was located over Ashland, or
  near Gloucester City, moving east at 30 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...
  Camden, Gloucester City, Cherry Hill, Evesham, Mount Laurel,
  Deptford, Voorhees, Medford, West Deptford, Lindenwold, Bellmawr,
  Woodbury, Berlin, Tabernacle, Paulsboro, Magnolia, Westville,
  Woodbury Heights, National Park and Brooklawn.

This includes the following highways...
 New Jersey Turnpike between exits 3 and 4.
 Interstate 76 in New Jersey between mile markers 0 and 3.
 Interstate 295 in New Jersey between mile markers 18 and 39.
 Interstate 676 in New Jersey between mile markers 0 and 1.
 Atlantic City Expressway between mile markers 41 and 44.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

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

&&

LAT...LON 3967 7481 3982 7526 3989 7516 3988 7515
      3991 7513 3996 7505 3994 7464
TIME...MOT...LOC 1903Z 278DEG 25KT 3988 7501 

HAIL...1.00IN
WIND...60MPH
 
$$

Gorse

2 follow-up statements

576 
WWUS51 KPHI 211919
SVSPHI

Severe Weather Statement
National Weather Service Mount Holly NJ
319 PM EDT Wed Jul 21 2021

NJC005-007-015-212000-
/O.CON.KPHI.SV.W.0213.000000T0000Z-210721T2000Z/
Camden NJ-Gloucester NJ-Burlington NJ-
319 PM EDT Wed Jul 21 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 400 PM EDT
FOR CAMDEN...NORTHEASTERN GLOUCESTER AND WEST CENTRAL BURLINGTON
COUNTIES...

At 319 PM EDT, a severe thunderstorm was located over Voorhees, or 10
miles east of Gloucester City, moving east at 20 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...
Cherry Hill, Evesham, Mount Laurel, Voorhees, Medford, Lindenwold,
Bellmawr, Berlin, Tabernacle, Magnolia, Chesilhurst, Ramblewood,
Barclay-Kingston, Echelon, Marlton, Leisuretowne, Ashland,
Springdale, Atco and Erlton-Ellisburg.

This includes the following highways...
 New Jersey Turnpike between exits 3 and 4.
 Interstate 295 in New Jersey between mile markers 29 and 38.
 Atlantic City Expressway near mile marker 44.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

Frequent cloud to ground lightning is occurring with this storm. 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 3967 7481 3979 7511 3987 7508 3995 7496
      3994 7464
TIME...MOT...LOC 1919Z 288DEG 18KT 3984 7493 

HAIL...1.00IN
WIND...60MPH
 
$$

Gorse

586 
WWUS51 KPHI 211932
SVSPHI

Severe Weather Statement
National Weather Service Mount Holly NJ
332 PM EDT Wed Jul 21 2021

NJC015-211941-
/O.CAN.KPHI.SV.W.0213.000000T0000Z-210721T2000Z/
Gloucester NJ-
332 PM EDT Wed Jul 21 2021

...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN GLOUCESTER COUNTY
IS CANCELLED...
    
The severe thunderstorm which prompted the warning has moved out of 
the warned area. Therefore, this warning has been cancelled.

A Severe Thunderstorm Watch remains in effect until 800 PM EDT for
southern New Jersey.

LAT...LON 3967 7481 3976 7500 3986 7500 3995 7490
      3994 7464
TIME...MOT...LOC 1931Z 276DEG 23KT 3983 7483 

$$

NJC005-007-212000-
/O.CON.KPHI.SV.W.0213.000000T0000Z-210721T2000Z/
Camden NJ-Burlington NJ-
332 PM EDT Wed Jul 21 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 400 PM EDT
FOR CENTRAL CAMDEN AND CENTRAL BURLINGTON COUNTIES...

At 331 PM EDT, a severe thunderstorm was located near Marlton Lakes,
or 15 miles east of Gloucester City, moving east at 25 mph.

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

SOURCE...Trained weather spotters. Quarter size hail was reported 
         earlier in the Laurel Springs area.

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

Locations impacted include...
Evesham, Voorhees, Medford, Lindenwold, Berlin, Tabernacle,
Chesilhurst, Springdale, Atco, Echelon, Marlton, Leisuretowne,
Marlton Lakes, Greentree, Ashland, Ramblewood, Pine Hill, Stratford,
Clementon and Medford Lakes.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

Frequent cloud to ground lightning is occurring with this storm. 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 3967 7481 3976 7500 3986 7500 3995 7490
      3994 7464
TIME...MOT...LOC 1931Z 276DEG 23KT 3983 7483 

HAIL...1.00IN
WIND...60MPH
 
$$

Gorse

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 21, 11:09 AM EDT	Special Weather Statement	PHI	Morris	36 min
Jul 21, 12:41 PM EDT	Special Weather Statement	PHI	Ocean	34 min
Jul 21, 12:46 PM EDT	Special Marine Warning	PHI		89 min
Jul 21, 12:51 PM EDT	Severe Thunderstorm Warning	PHI	Atlantic, Ocean	39 min
Jul 21, 12:53 PM EDT	Severe Thunderstorm Warning	PHI	Ocean	67 min
Jul 21, 1:28 PM EDT	Severe Thunderstorm Warning	PHI	Atlantic	47 min
Jul 21, 1:43 PM EDT	Severe Thunderstorm Warning	PHI	Ocean	49 min
Jul 21, 2:10 PM EDT	Special Marine Warning	PHI		95 min
Jul 21, 2:13 PM EDT	Severe Thunderstorm Warning	PHI	Burlington	47 min
Jul 21, 2:35 PM EDT	Special Marine Warning	PHI		55 min
Jul 21, 2:52 PM EDT	Severe Thunderstorm Warning	PHI	Ocean	26 min
Jul 21, 3:16 PM EDT	Severe Thunderstorm Warning	PHI	Burlington, Camden	44 min
Jul 21, 3:27 PM EDT	Severe Thunderstorm Warning	PHI	Camden, Gloucester	33 min
Jul 21, 3:43 PM EDT	Severe Thunderstorm Warning	PHI	Monmouth, Ocean	47 min
Jul 21, 3:48 PM EDT	Special Marine Warning	PHI		57 min
Jul 21, 3:48 PM EDT	Severe Thunderstorm Warning	PHI	Burlington, Camden	42 min
Jul 21, 3:57 PM EDT	Severe Thunderstorm Warning	PHI	Atlantic, Burlington, Camden, Gloucester, Salem	33 min
Jul 21, 4:04 PM EDT	Special Marine Warning	PHI		56 min
Jul 21, 4:17 PM EDT	Special Marine Warning	PHI		58 min
Jul 21, 4:50 PM EDT	Special Marine Warning	PHI		55 min
Jul 21, 5:07 PM EDT	Special Marine Warning	PHI		23 min
Jul 21, 5:09 PM EDT	Special Marine Warning	PHI		66 min
Jul 21, 5:24 PM EDT	Special Marine Warning	PHI		46 min
Jul 21, 5:31 PM EDT	Severe Thunderstorm Warning	PHI	Cape May	29 min
Jul 21, 5:52 PM EDT	Special Marine Warning	PHI		53 min

Nearby

Severe Thunderstorm Warnings in New Jersey, 2021 Every severe thunderstorm warning in 2021

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.