Alert archive / New Jersey / Severe Thunderstorm Warnings in 2020

Severe Thunderstorm Warning 246, NWS Philadelphia/Mount Holly

August 23, 2020Atlantic County, Cape May County, Cumberland County, New Jersey

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Aug 23, 2020, 5:33 PM EDT for Atlantic County, Cape May County, Cumberland County, New Jersey. It was in force for 57 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued: Aug 23, 2020, 5:33 PM EDT (21:33 UTC)
Expired: Aug 23, 2020, 6:30 PM EDT
In force: 57 min
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

Counties Atlantic County, NJ, Cape May County, NJ, Cumberland County, NJ

The radar

The Dover AFB radar (KDOX), 66 km from the middle of the area, began a volume at 21:37 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.

The nearest sounding before it

Wallops Is Stn, VA (KWAL), launched 12:00Z, 9.6 hours before the alert went out and 151 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: 1300 J/kg
Mixed-layer CIN: -11 J/kg
Mixed-layer LCL: 845 m above ground
0-6 km bulk shear: 29 kt
0-1 km storm-relative helicity: 33 m²/s²
0-3 km storm-relative helicity: 57 m²/s²
Significant tornado parameter: 0.2
Supercell composite: 1.6

Open this sounding in Storm Lab

The text

As transmitted.

162 
WUUS51 KPHI 232133
SVRPHI
NJC001-009-011-232230-
/O.NEW.KPHI.SV.W.0246.200823T2133Z-200823T2230Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Mount Holly NJ
533 PM EDT Sun Aug 23 2020

The National Weather Service in Mount Holly NJ has issued a

* Severe Thunderstorm Warning for...
  South central Atlantic County in southern New Jersey...
  Southeastern Cumberland County in southern New Jersey...
  Cape May County in southern New Jersey...

* Until 630 PM EDT.

* At 532 PM EDT, a severe thunderstorm was located over Bricksboro,
  or near Millville, moving southeast at 15 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...
  Ocean City, Woodbine, Sea Isle City, Estell Manor, Avalon, Stone
  Harbor, Corbin City, Mauricetown, Belleplain Forest, Leesburg,
  Scotch Bonnet, Beesleys Point, Port Norris, Seaville, Marmora,
  Dennisville, Bricksboro, Goshen, Strathmere and Port Elizabeth.

This includes Garden State Parkway between mile markers 10 and 26.
 
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 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 3924 7509 3936 7492 3926 7457 3904 7475
TIME...MOT...LOC 2132Z 301DEG 13KT 3931 7499 

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

Gorse

3 follow-up statements

945 
WWUS51 KPHI 232155
SVSPHI

Severe Weather Statement
National Weather Service Mount Holly NJ
555 PM EDT Sun Aug 23 2020

NJC001-009-011-232230-
/O.CON.KPHI.SV.W.0246.000000T0000Z-200823T2230Z/
Atlantic NJ-Cumberland NJ-Cape May NJ-
555 PM EDT Sun Aug 23 2020

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 630 PM EDT
FOR SOUTH CENTRAL ATLANTIC...SOUTHEASTERN CUMBERLAND AND CAPE MAY
COUNTIES...

At 554 PM EDT, a severe thunderstorm was located over Belleplain
Forest, or 13 miles southeast of Millville, moving southeast at 20 
mph. This storm is moving toward the beaches of northern and central 
Cape May County.

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...
Ocean City, Woodbine, Sea Isle City, Estell Manor, Avalon, Stone
Harbor, Corbin City, Belleplain Forest, Scotch Bonnet, Beesleys
Point, Seaville, Marmora, Dennisville, Goshen, Strathmere, Eldora,
Cape May Court House and Port Norris.

This includes Garden State Parkway between mile markers 10 and 26.
 
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 this storm, and
the storm will affect the beaches. For your safety, immediately move
off the beach and seek shelter indoors.

&&

LAT...LON 3904 7475 3921 7504 3934 7485 3926 7457
TIME...MOT...LOC 2154Z 310DEG 17KT 3925 7487 

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

Gorse

547 
WWUS51 KPHI 232213
SVSPHI

Severe Weather Statement
National Weather Service Mount Holly NJ
613 PM EDT Sun Aug 23 2020

NJC001-011-232222-
/O.CAN.KPHI.SV.W.0246.000000T0000Z-200823T2230Z/
Atlantic NJ-Cumberland NJ-
613 PM EDT Sun Aug 23 2020

...THE SEVERE THUNDERSTORM WARNING FOR SOUTH CENTRAL ATLANTIC AND
SOUTHEASTERN CUMBERLAND COUNTIES IS CANCELLED...
    
The severe thunderstorm which prompted the warning has weakened or 
moved out of the warned area. Therefore, the warning has been 
cancelled.

LAT...LON 3904 7475 3917 7491 3929 7476 3926 7457
TIME...MOT...LOC 2212Z 305DEG 14KT 3921 7481 

$$

NJC009-232230-
/O.CON.KPHI.SV.W.0246.000000T0000Z-200823T2230Z/
Cape May NJ-
613 PM EDT Sun Aug 23 2020

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 630 PM EDT
FOR NORTHERN CAPE MAY COUNTY...

At 612 PM EDT, a severe thunderstorm was located over Woodbine, or 11
miles west of Ocean City, moving southeast at 15 mph.

HAZARD...60 mph wind gusts.

SOURCE...Radar indicated.

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

Locations impacted include...
Ocean City, Woodbine, Sea Isle City, Avalon, Stone Harbor, Marmora,
Dennisville, Goshen, Strathmere, Seaville and Cape May Court House.

This includes Garden State Parkway between mile markers 11 and 26.
 
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.

Cloud to ground lightning is occurring with this storm, and the 
storm will affect the beaches. For your safety, immediately move off 
the beach and seek shelter indoors.

&&

LAT...LON 3904 7475 3917 7491 3929 7476 3926 7457
TIME...MOT...LOC 2212Z 305DEG 14KT 3921 7481 

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

Gorse

524 
WWUS51 KPHI 232221
SVSPHI

Severe Weather Statement
National Weather Service Mount Holly NJ
621 PM EDT Sun Aug 23 2020

NJC009-232231-
/O.EXP.KPHI.SV.W.0246.000000T0000Z-200823T2230Z/
Cape May NJ-
621 PM EDT Sun Aug 23 2020

...THE SEVERE THUNDERSTORM WARNING FOR NORTHERN CAPE MAY COUNTY WILL
EXPIRE AT 630 PM EDT...
                
The storm which prompted the warning has weakened below severe
limits, and no longer poses an immediate threat to life or property.
Therefore, the warning will be allowed to expire.  However gusty
winds and heavy rain are still possible with this thunderstorm.

LAT...LON 3904 7475 3917 7491 3929 7476 3926 7457
TIME...MOT...LOC 2221Z 301DEG 13KT 3919 7478 

$$

Gorse

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 23, 11:30 AM EDT	Special Weather Statement	PHI	Atlantic	30 min
Aug 23, 12:21 PM EDT	Special Weather Statement	PHI	Atlantic, Gloucester	69 min
Aug 23, 12:59 PM EDT	Special Weather Statement	PHI	Burlington, Camden	61 min
Aug 23, 1:45 PM EDT	Special Weather Statement	PHI	Salem	60 min
Aug 23, 3:13 PM EDT	Special Weather Statement	PHI	Gloucester	32 min
Aug 23, 3:44 PM EDT	Special Weather Statement	PHI	Salem	31 min
Aug 23, 3:53 PM EDT	Areal Flood Advisory	PHI	Atlantic, Cumberland, Gloucester, Salem	3 hr
Aug 23, 4:10 PM EDT	Special Weather Statement	PHI	Salem	35 min
Aug 23, 4:45 PM EDT	Special Weather Statement	PHI	Cumberland	30 min
Aug 23, 4:53 PM EDT	Severe Thunderstorm Warning	PHI	Cumberland	52 min
Aug 23, 5:18 PM EDT	Special Weather Statement	PHI	Atlantic	27 min
Aug 23, 6:00 PM EDT	Special Marine Warning	PHI		42 min

Nearby

Severe Thunderstorm Warnings in New Jersey, 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.