Alert archive / New Jersey / Severe Thunderstorm Warnings in 2020

Severe Thunderstorm Warning 245, NWS Philadelphia/Mount Holly

August 23, 2020Cumberland County, New Jersey

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Aug 23, 2020, 4:53 PM EDT for Cumberland County, New Jersey. It was in force for 52 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: Aug 23, 2020, 4:53 PM EDT (20:53 UTC)
Expired: Aug 23, 2020, 5:45 PM EDT
In force: 52 min
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

County Cumberland County, NJ

The radar

The Dover AFB radar (KDOX), 70 km from the middle of the area, began a volume at 20:55 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
Aug 23, 4:53 PM EDT	TSTM WND DMG	2 Ne Bridgeton, NJ	REPORT OF POWER LINES DOWN NEAR VICTORY ROAD. TIME ESTIMATED FROM RADAR.
Aug 23, 4:53 PM EDT	TSTM WND DMG	Bridgeton, NJ	REPORTS OF TREES DOWN IN HOPEWELL TWP AND THE BRIDGETON AREA, INCLUDING NEAR GREENWOOD DRIVE AND OSBORN LANE. 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

Wallops Is Stn, VA (KWAL), launched 12:00Z, 8.9 hours before the alert went out and 161 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.

636 
WUUS51 KPHI 232053
SVRPHI
NJC011-232145-
/O.NEW.KPHI.SV.W.0245.200823T2053Z-200823T2145Z/

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

The National Weather Service in Mount Holly NJ has issued a

* Severe Thunderstorm Warning for...
  Cumberland County in southern New Jersey...

* Until 545 PM EDT.

* At 453 PM EDT, a severe thunderstorm was located over Fairton, or
  near Bridgeton, moving east at 20 mph.

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

  SOURCE...Radar indicated.

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

* Locations impacted include...
  Vineland, Millville, Bridgeton, Cumberland, Laurel Lake, Greenwich,
  Newport, Mauricetown, Leesburg, Port Norris, Dividing Creek,
  Fairton, Bricksboro, Cedarville, Port Elizabeth, Bivalve, South
  Vineland and Rosenhayn.

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 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 3931 7487 3931 7489 3923 7490 3923 7492
      3918 7491 3915 7492 3939 7538 3949 7517
      3948 7510 3946 7508 3947 7508 3942 7486
      3939 7485
TIME...MOT...LOC 2053Z 289DEG 17KT 3940 7518 

HAIL...0.75IN
WIND...60MPH
 
$$

Gorse

3 follow-up statements

571 
WWUS51 KPHI 232106
SVSPHI

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

NJC011-232145-
/O.CON.KPHI.SV.W.0245.000000T0000Z-200823T2145Z/
Cumberland NJ-
506 PM EDT Sun Aug 23 2020

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 545 PM EDT
FOR SOUTHERN CUMBERLAND COUNTY...

At 506 PM EDT, a severe thunderstorm was located near Millville,
moving southeast at 15 mph.

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

SOURCE...Radar indicated.

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

Locations impacted include...
Vineland, Millville, Bridgeton, Cumberland, Laurel Lake, Newport,
Mauricetown, Leesburg, Port Norris, Dividing Creek, Fairton,
Bricksboro, Cedarville, Port Elizabeth, Bivalve and South Vineland.

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. 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 3931 7487 3931 7489 3923 7490 3923 7492
      3919 7492 3918 7491 3915 7492 3937 7535
      3946 7508 3947 7508 3942 7486 3939 7485
TIME...MOT...LOC 2106Z 299DEG 15KT 3937 7513 

HAIL...0.75IN
WIND...60MPH
 
$$

Gorse

021 
WWUS51 KPHI 232121
SVSPHI

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

NJC011-232145-
/O.CON.KPHI.SV.W.0245.000000T0000Z-200823T2145Z/
Cumberland NJ-
521 PM EDT Sun Aug 23 2020

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 545 PM EDT
FOR SOUTHEASTERN CUMBERLAND COUNTY...

At 521 PM EDT, a severe thunderstorm was located near Millville,
moving southeast 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...
Vineland, Millville, Cumberland, Laurel Lake, Newport, Mauricetown,
Leesburg, Bricksboro, Port Elizabeth, Bivalve, Port Norris and
Dividing Creek.

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. 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 3931 7487 3931 7489 3923 7490 3923 7492
      3919 7492 3918 7491 3915 7492 3930 7522
      3943 7501 3942 7486 3939 7485
TIME...MOT...LOC 2121Z 297DEG 28KT 3935 7511 

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

Gorse

361 
WWUS51 KPHI 232134
SVSPHI

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

NJC011-232145-
/O.CON.KPHI.SV.W.0245.000000T0000Z-200823T2145Z/
Cumberland NJ-
534 PM EDT Sun Aug 23 2020

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 545 PM EDT
FOR SOUTHEASTERN CUMBERLAND COUNTY...

At 534 PM EDT, a severe thunderstorm was located over Mauricetown, or
7 miles southeast of Millville, moving southeast at 25 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...
Cumberland, Laurel Lake, Mauricetown, Leesburg, Bricksboro, Port
Elizabeth, Bivalve, Port Norris and Dividing Creek.

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. 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 3931 7487 3931 7489 3923 7490 3923 7492
      3919 7492 3918 7491 3915 7492 3926 7515
      3927 7515 3942 7486 3939 7485
TIME...MOT...LOC 2134Z 298DEG 23KT 3929 7500 

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
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, 5:18 PM EDT	Special Weather Statement	PHI	Atlantic	27 min
Aug 23, 5:33 PM EDT	Severe Thunderstorm Warning	PHI	Atlantic, Cape May, Cumberland	57 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.