Alert archive / New Jersey / Severe Thunderstorm Warnings in 2020

Severe Thunderstorm Warning 96, NWS Philadelphia/Mount Holly

July 1, 2020Atlantic County, Cape May County, Cumberland County, New Jersey

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Jul 1, 2020, 3:20 PM EDT for Atlantic County, Cape May County, Cumberland County, New Jersey. It was in force for 55 min. 8 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 1, 2020, 3:20 PM EDT (19:20 UTC)
Expired
Jul 1, 2020, 4:15 PM EDT
In force
55 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), 77 km from the middle of the area, began a volume at 19:24 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 1, 3:40 PM EDTHAIL 1Petersburg, NJTIME ESTIMATED BY RADAR.
Jul 1, 3:40 PM EDTHAIL 1.75Petersburg, NJGOLF BALL SIZED HAIL REPORTED IN PETERSBURG. PICTURES RECEIVED VIA SOCIAL MEDIA.
Jul 1, 3:45 PM EDTTSTM WND DMG1 Ene Seaville, NJTREE DOWN ON THE GARDEN STATE PARKWAY. TIME ESTIMATED FROM RADAR.
Jul 1, 3:45 PM EDTHAIL 0.5Seaville, NJHAIL TO AROUND HALF INCH IN DIAMETER REPORTED IN SEAVILLE. TIME ESTIMATED FROM RADAR.
Jul 1, 4:02 PM EDTHAIL 0.5Marmora, NJTIME VERIFIED BY RADAR.
Jul 1, 4:06 PM EDTHAIL 0.252 Ne Seaville, NJ
Jul 1, 4:10 PM EDTHAIL 12 Sw Ocean City, NJMULTIPLE REPORTS OF QUARTER SIZE HAIL IN OCEAN CITY. TIME ESTIMATED FROM RADAR.
Jul 1, 4:13 PM EDTMARINE TSTM WIND 49Ocean City, NJ

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, 7.3 hours before the alert went out and 160 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 2020-07-01Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 706 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°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 2020-07-01The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 29 square meters per square second.1939Sfc1 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
706 J/kg
Mixed-layer CIN
-57 J/kg
Mixed-layer LCL
1227 m above ground
0-6 km bulk shear
29 kt
0-1 km storm-relative helicity
29 m²/s²
0-3 km storm-relative helicity
42 m²/s²
Significant tornado parameter
0.1
Supercell composite
1.4

Open this sounding in Storm Lab

The text

As transmitted.

174 
WUUS51 KPHI 011920
SVRPHI
NJC001-009-011-012015-
/O.NEW.KPHI.SV.W.0096.200701T1920Z-200701T2015Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Mount Holly NJ
320 PM EDT Wed Jul 1 2020

The National Weather Service in Mount Holly NJ has issued a

* Severe Thunderstorm Warning for...
  Southwestern Atlantic County in southern New Jersey...
  East central Cumberland County in southern New Jersey...
  Northern Cape May County in southern New Jersey...

* Until 415 PM EDT.

* At 320 PM EDT, a severe thunderstorm was located over Corbin City, 
  or 8 miles west of Ocean City with additional storms nearby, 
  moving east at 10 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...
  Atlantic City, Ocean City, Pleasantville, Somers Point, Ventnor
  City, Northfield, Margate City, Woodbine, Sea Isle City, Estell
  Manor, Avalon, Longport, Corbin City, Belleplain Forest, Beesleys
  Point, English Creek, Seaville, Marmora, Dorothy and Bricksboro.

This includes Garden State Parkway between mile markers 14 and 34.
 
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 3931 7499 3941 7484 3936 7444 3923 7461
      3907 7472
TIME...MOT...LOC 1920Z 284DEG 10KT 3928 7475 

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

Gorse
2 follow-up statements
943 
WWUS51 KPHI 011939
SVSPHI

Severe Weather Statement
National Weather Service Mount Holly NJ
339 PM EDT Wed Jul 1 2020

NJC001-009-011-012015-
/O.CON.KPHI.SV.W.0096.000000T0000Z-200701T2015Z/
Atlantic NJ-Cumberland NJ-Cape May NJ-
339 PM EDT Wed Jul 1 2020

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 415 PM EDT
FOR SOUTHWESTERN ATLANTIC...EAST CENTRAL CUMBERLAND AND NORTHERN CAPE
MAY COUNTIES...

At 339 PM EDT, a severe thunderstorm was located over Seaville, or
near Ocean City, moving southeast at 10 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...
Atlantic City, Ocean City, Pleasantville, Somers Point, Ventnor City,
Northfield, Margate City, Woodbine, Sea Isle City, Estell Manor,
Avalon, Longport, Corbin City, Belleplain Forest, Beesleys Point,
English Creek, Seaville, Marmora, Dorothy and Bricksboro.

This includes Garden State Parkway between mile markers 14 and 34.
 
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.

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 3931 7499 3941 7484 3936 7444 3923 7461
      3907 7472
TIME...MOT...LOC 1939Z 312DEG 11KT 3924 7470 

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

Gorse
428 
WWUS51 KPHI 012007
SVSPHI

Severe Weather Statement
National Weather Service Mount Holly NJ
407 PM EDT Wed Jul 1 2020

NJC001-009-011-012016-
/O.EXP.KPHI.SV.W.0096.000000T0000Z-200701T2015Z/
Atlantic NJ-Cumberland NJ-Cape May NJ-
407 PM EDT Wed Jul 1 2020

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHWESTERN ATLANTIC...EAST
CENTRAL CUMBERLAND AND NORTHERN CAPE MAY COUNTIES WILL EXPIRE AT 415
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 small hail
and gusty winds are still possible with this thunderstorm.

LAT...LON 3931 7499 3941 7484 3936 7444 3923 7461
      3907 7472
TIME...MOT...LOC 2006Z 284DEG 10KT 3922 7461 

$$

Gorse

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 1, 10:53 AM EDTSpecial Weather StatementPHIMorris37 min
Jul 1, 11:08 AM EDTAreal Flood AdvisoryPHIMorris, Somerset102 min
Jul 1, 12:28 PM EDTAreal Flood AdvisoryPHIMiddlesex, Monmouth119 min
Jul 1, 12:39 PM EDTSpecial Marine WarningPHI96 min
Jul 1, 1:30 PM EDTSpecial Weather StatementPHIOcean45 min
Jul 1, 1:45 PM EDTSpecial Weather StatementPHIAtlantic45 min
Jul 1, 2:17 PM EDTSpecial Weather StatementPHIOcean43 min
Jul 1, 2:25 PM EDTSpecial Weather StatementPHIAtlantic35 min
Jul 1, 2:55 PM EDTSpecial Weather StatementPHIAtlantic65 min
Jul 1, 3:10 PM EDTFlash Flood WarningPHIAtlantic3 hr
Jul 1, 3:17 PM EDTSpecial Marine WarningPHI88 min
Jul 1, 4:05 PM EDTFlash Flood WarningPHIAtlantic, Cape May, Cumberland3 hr
Jul 1, 4:15 PM EDTSpecial Weather StatementPHICape May45 min
Jul 1, 5:09 PM EDTSpecial Weather StatementPHICumberland51 min
Jul 1, 5:27 PM EDTAreal Flood AdvisoryPHICumberland, Salem55 min
Jul 1, 7:06 PM EDTSpecial Weather StatementPHISomerset24 min

Nearby

Severe Thunderstorm Warnings in New Jersey, 2020Every 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.