Alert archive / New Jersey / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 219, NWS Philadelphia/Mount Holly

July 21, 20215 counties in New Jersey

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Jul 21, 2021, 3:57 PM EDT for 5 counties in New Jersey. It was in force for 33 min. 2 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, 3:57 PM EDT (19:57 UTC)
Expired
Jul 21, 2021, 4:30 PM EDT
In force
33 min
Issued by
NWS Philadelphia/Mount Holly
Area
Storm-based polygon
Hail
1.0 in
Wind
60.0 mph

Counties Atlantic County, NJ, Burlington County, NJ, Camden County, NJ, Gloucester County, NJ, Salem County, NJ

The radar

The Philadelphia radar (KDIX), 56 km from the middle of the area, began a volume at 20:00 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

TimeReportWhereRemark
Jul 21, 4:00 PM EDTHAIL 0.88West Deptford Twp, NJ
Jul 21, 4:05 PM EDTHAIL 0.7Deptford 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.

IssuedProductOfficeLasted
Jul 21, 11:56 AM EDTSevere Thunderstorm WatchSPC7 hr

The nearest sounding before it

Wallops Is Stn, VA (KWAL), launched 12:00Z, 8.0 hours before the alert went out and 202 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-pSkew-T log-p diagram, Wallops Is Stn, VA at 12:00Z on 2021-07-21Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 728 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Wallops Is Stn, VA at 12:00Z on 2021-07-21The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 17 square meters per square second.193958Sfc1 km3 km6 km9 kmRMLM
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
728 J/kg
Mixed-layer CIN
-47 J/kg
Mixed-layer LCL
1221 m above ground
0-6 km bulk shear
21 kt
0-1 km storm-relative helicity
17 m²/s²
0-3 km storm-relative helicity
-10 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.4

Open this sounding in Storm Lab

The text

As transmitted.

475 
WUUS51 KPHI 211957
SVRPHI
NJC001-005-007-015-033-212030-
/O.NEW.KPHI.SV.W.0219.210721T1957Z-210721T2030Z/

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

The National Weather Service in Mount Holly NJ has issued a

* Severe Thunderstorm Warning for...
  Northwestern Atlantic County in southern New Jersey...
  Northeastern Salem County in southern New Jersey...
  Camden County in southern New Jersey...
  Gloucester County in southern New Jersey...
  Southwestern Burlington County in southern New Jersey...

* Until 430 PM EDT.

* At 357 PM EDT, a severe thunderstorm was located over Paulsboro, or
  7 miles southwest of Gloucester City, moving east at 40 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...
  Deptford, Voorhees, West Deptford, Glassboro, Lindenwold,
  Hammonton, Bellmawr, Woodbury, Pitman, Clayton, Berlin, Tabernacle,
  Shamong, Paulsboro, Magnolia, Westville, Egg Harbor City,
  Woodstown, Woodbury Heights and National Park.

This includes the following highways...
 New Jersey Turnpike between exits 2 and 3.
 Interstate 76 in New Jersey near mile marker 0.
 Interstate 295 in New Jersey between mile markers 16 and 29.
 Atlantic City Expressway between mile markers 23 and 44.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3954 7461 3965 7532 3973 7538 3986 7522
      3988 7517 3984 7467
TIME...MOT...LOC 1957Z 277DEG 33KT 3982 7523 

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

NC
2 follow-up statements
589 
WWUS51 KPHI 212015
SVSPHI

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

NJC033-212025-
/O.CAN.KPHI.SV.W.0219.000000T0000Z-210721T2030Z/
Salem NJ-
415 PM EDT Wed Jul 21 2021

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

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

LAT...LON 3954 7461 3962 7511 3963 7515 3964 7517
      3968 7518 3979 7514 3985 7508 3984 7467
TIME...MOT...LOC 2015Z 277DEG 33KT 3980 7501 

$$

NJC001-005-007-015-212030-
/O.CON.KPHI.SV.W.0219.000000T0000Z-210721T2030Z/
Atlantic NJ-Camden NJ-Gloucester NJ-Burlington NJ-
415 PM EDT Wed Jul 21 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 430 PM EDT
FOR NORTHWESTERN ATLANTIC...CAMDEN...NORTHEASTERN GLOUCESTER AND
SOUTHWESTERN BURLINGTON COUNTIES...

At 415 PM EDT, a severe thunderstorm was located over Lindenwold, or
8 miles southeast of Gloucester City, moving east at 40 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...
Glassboro, Lindenwold, Hammonton, Pitman, Clayton, Berlin, Shamong,
Egg Harbor City, Chesilhurst, Franklinville, Sicklerville,
Elwood-Magnolia, Atsion, Echelon, Atco, Victory Lakes, Williamstown,
Batsto, Marlton Lakes and Turnersville.

This includes Atlantic City Expressway between mile markers 23 and
44.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3954 7461 3962 7511 3963 7515 3964 7517
      3968 7518 3979 7514 3985 7508 3984 7467
TIME...MOT...LOC 2015Z 277DEG 33KT 3980 7501 

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

NC
627 
WWUS51 KPHI 212024
SVSPHI

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

NJC001-005-007-015-212033-
/O.EXP.KPHI.SV.W.0219.000000T0000Z-210721T2030Z/
Atlantic NJ-Camden NJ-Gloucester NJ-Burlington NJ-
424 PM EDT Wed Jul 21 2021

...THE SEVERE THUNDERSTORM WARNING FOR NORTHWESTERN ATLANTIC...
CAMDEN...NORTHEASTERN GLOUCESTER AND SOUTHWESTERN BURLINGTON COUNTIES
WILL EXPIRE AT 430 PM EDT...
    
The severe thunderstorm which prompted the warning has weakened.
Therefore, the warning will be allowed to expire.  However gusty 
winds and heavy rain are still possible with this thunderstorm.

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

To report severe weather, contact your nearest law enforcement
agency. They will relay your report to the National Weather Service
Mount Holly NJ.

LAT...LON 3954 7461 3962 7511 3963 7515 3964 7517
      3968 7518 3979 7514 3985 7508 3984 7467
TIME...MOT...LOC 2023Z 277DEG 33KT 3979 7491 

$$

NC

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 21, 11:09 AM EDTSpecial Weather StatementPHIMorris36 min
Jul 21, 12:41 PM EDTSpecial Weather StatementPHIOcean34 min
Jul 21, 12:46 PM EDTSpecial Marine WarningPHI89 min
Jul 21, 12:51 PM EDTSevere Thunderstorm WarningPHIAtlantic, Ocean39 min
Jul 21, 12:53 PM EDTSevere Thunderstorm WarningPHIOcean67 min
Jul 21, 1:28 PM EDTSevere Thunderstorm WarningPHIAtlantic47 min
Jul 21, 1:43 PM EDTSevere Thunderstorm WarningPHIOcean49 min
Jul 21, 2:10 PM EDTSpecial Marine WarningPHI95 min
Jul 21, 2:13 PM EDTSevere Thunderstorm WarningPHIBurlington47 min
Jul 21, 2:35 PM EDTSpecial Marine WarningPHI55 min
Jul 21, 2:52 PM EDTSevere Thunderstorm WarningPHIOcean26 min
Jul 21, 3:04 PM EDTSevere Thunderstorm WarningPHIBurlington, Camden, Gloucester56 min
Jul 21, 3:16 PM EDTSevere Thunderstorm WarningPHIBurlington, Camden44 min
Jul 21, 3:27 PM EDTSevere Thunderstorm WarningPHICamden, Gloucester33 min
Jul 21, 3:43 PM EDTSevere Thunderstorm WarningPHIMonmouth, Ocean47 min
Jul 21, 3:48 PM EDTSpecial Marine WarningPHI57 min
Jul 21, 3:48 PM EDTSevere Thunderstorm WarningPHIBurlington, Camden42 min
Jul 21, 4:04 PM EDTSpecial Marine WarningPHI56 min
Jul 21, 4:17 PM EDTSpecial Marine WarningPHI58 min
Jul 21, 4:50 PM EDTSpecial Marine WarningPHI55 min
Jul 21, 5:07 PM EDTSpecial Marine WarningPHI23 min
Jul 21, 5:09 PM EDTSpecial Marine WarningPHI66 min
Jul 21, 5:24 PM EDTSpecial Marine WarningPHI46 min
Jul 21, 5:31 PM EDTSevere Thunderstorm WarningPHICape May29 min
Jul 21, 5:52 PM EDTSpecial Marine WarningPHI53 min

Nearby

Severe Thunderstorm Warnings in New Jersey, 2021Every 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.