Alert archive / New Jersey / Severe Thunderstorm Warnings in 2020

Severe Thunderstorm Warning 281, NWS Philadelphia/Mount Holly

August 28, 20208 counties in New Jersey

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Aug 28, 2020, 5:28 PM EDT for 8 counties in New Jersey. It was in force for 47 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 28, 2020, 5:28 PM EDT (21:28 UTC)
Expired: Aug 28, 2020, 6:15 PM EDT
In force: 47 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, Cape May County, NJ, Cumberland County, NJ, Gloucester County, NJ, Ocean County, NJ, Salem County, NJ

The radar

The Philadelphia radar (KDIX), 71 km from the middle of the area, began a volume at 21:27 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 28, 6:02 PM EDT	MARINE TSTM WIND 45	1 Ssw North Cape May, NJ	WEATHERFLOW SENSOR.
Aug 28, 6:24 PM EDT	MARINE TSTM WIND 40	5 Se Mystic Island, NJ	HADS SENSOR.

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
Aug 28, 1:37 PM EDT	Severe Thunderstorm Watch	SPC	8 hr

The nearest sounding before it

Wallops Is Stn, VA (KWAL), launched 12:00Z, 9.5 hours before the alert went out and 169 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: 264 J/kg
Mixed-layer CIN: -171 J/kg
Mixed-layer LCL: 1367 m above ground
0-6 km bulk shear: 24 kt
0-1 km storm-relative helicity: 44 m²/s²
0-3 km storm-relative helicity: 104 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

546 
WUUS51 KPHI 282128
SVRPHI
NJC001-005-007-009-011-015-029-033-282215-
/O.NEW.KPHI.SV.W.0281.200828T2128Z-200828T2215Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Mount Holly NJ
528 PM EDT Fri Aug 28 2020

The National Weather Service in Mount Holly NJ has issued a

* Severe Thunderstorm Warning for...
  Atlantic County in southern New Jersey...
  Cumberland County in southern New Jersey...
  East central Salem County in southern New Jersey...
  Southeastern Ocean County in southern New Jersey...
  Southeastern Camden County in southern New Jersey...
  Southeastern Gloucester County in southern New Jersey...
  Cape May County in southern New Jersey...
  Southeastern Burlington County in southern New Jersey...

* Until 615 PM EDT.

* At 528 PM EDT, severe thunderstorms were located along a line
  extending from Chesilhurst to near Millville to near Greenwich,
  moving east at 45 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, Atlantic City, Millville, Bridgeton, Ocean City, Cape
  May, Cumberland, Barnegat, Pleasantville, Hammonton, Somers Point,
  Ventnor City, Brigantine, Northfield, Absecon, Clayton, Berlin,
  Shamong, Margate City and Buena.

This includes the following highways...
 Garden State Parkway between mile markers 0 and 69.
 Atlantic City Expressway between mile markers 0 and 39.

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 these storms. Move indoors
immediately. Remember, if you can hear thunder, you are close enough
to be struck by lightning.

&&

LAT...LON 3977 7408 3946 7424 3887 7489 3893 7501
      3915 7492 3915 7514 3932 7536 3980 7494
TIME...MOT...LOC 2128Z 282DEG 39KT 3973 7490 3941 7514 3932 7534 

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

Staarmann

1 follow-up statement

879 
WWUS51 KPHI 282159
SVSPHI

Severe Weather Statement
National Weather Service Mount Holly NJ
559 PM EDT Fri Aug 28 2020

NJC007-015-033-282208-
/O.CAN.KPHI.SV.W.0281.000000T0000Z-200828T2215Z/
Salem NJ-Camden NJ-Gloucester NJ-
559 PM EDT Fri Aug 28 2020

...THE SEVERE THUNDERSTORM WARNING FOR EAST CENTRAL SALEM...
SOUTHEASTERN CAMDEN AND SOUTHEASTERN GLOUCESTER COUNTIES IS
CANCELLED...

The storms which prompted the warning have 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 3944 7426 3887 7489 3892 7500 3894 7501
      3915 7492 3915 7514 3924 7526 3931 7481
      3973 7474 3978 7424 3977 7409
TIME...MOT...LOC 2158Z 285DEG 45KT 3967 7455 3927 7467 3912 7498 

$$

NJC001-005-009-011-029-282215-
/O.CON.KPHI.SV.W.0281.000000T0000Z-200828T2215Z/
Atlantic NJ-Cumberland NJ-Ocean NJ-Cape May NJ-Burlington NJ-
559 PM EDT Fri Aug 28 2020

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 615 PM EDT
FOR ATLANTIC...SOUTHEASTERN CUMBERLAND...SOUTHEASTERN OCEAN...CAPE
MAY AND SOUTHEASTERN BURLINGTON COUNTIES...

At 558 PM EDT, severe thunderstorms were located along a line
extending from near Wading River to Marmora to 6 miles northwest of
Green Creek, moving east at 50 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, Cape May, Barnegat, Pleasantville,
Hammonton, Somers Point, Ventnor City, Brigantine, Northfield,
Absecon, Margate City, Egg Harbor City, North Wildwood, Tuckerton,
Wildwood Crest, Woodbine, Sea Isle City, Estell Manor and Avalon.

This includes the following highways...
 Garden State Parkway between mile markers 0 and 69.
 Atlantic City Expressway between mile markers 0 and 23.

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 these storms.
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 3944 7426 3887 7489 3892 7500 3894 7501
      3915 7492 3915 7514 3924 7526 3931 7481
      3973 7474 3978 7424 3977 7409
TIME...MOT...LOC 2158Z 285DEG 45KT 3967 7455 3927 7467 3912 7498 

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

Staarmann

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 27, 8:13 PM EDT	Severe Thunderstorm Warning	PHI	Hunterdon, Somerset, Warren	47 min
Aug 27, 8:24 PM EDT	Special Weather Statement	PHI	Middlesex, Somerset	51 min
Aug 27, 8:29 PM EDT	Severe Thunderstorm Warning	PHI	Hunterdon, Mercer, Middlesex, Monmouth, Somerset	46 min
Aug 27, 8:55 PM EDT	Special Marine Warning	PHI		95 min
Aug 27, 9:13 PM EDT	Special Weather Statement	PHI	Hunterdon, Mercer, Middlesex, Monmouth, Somerset	47 min
Aug 27, 9:28 PM EDT	Severe Thunderstorm Warning	PHI	Mercer, Middlesex, Monmouth, Ocean, Somerset	47 min
Aug 28, 3:05 PM EDT	Special Marine Warning	PHI		85 min
Aug 28, 3:41 PM EDT	Special Weather Statement	PHI	Salem	34 min
Aug 28, 3:52 PM EDT	Severe Thunderstorm Warning	PHI	Cumberland, Gloucester, Salem	53 min
Aug 28, 3:53 PM EDT	Special Marine Warning	PHI		67 min
Aug 28, 4:07 PM EDT	Special Marine Warning	PHI		53 min
Aug 28, 4:17 PM EDT	Severe Thunderstorm Warning	PHI	Cape May	43 min
Aug 28, 4:29 PM EDT	Severe Thunderstorm Warning	PHI	Burlington, Camden, Gloucester, Mercer	61 min
Aug 28, 4:39 PM EDT	Severe Thunderstorm Warning	PHI	Camden, Cumberland, Gloucester, Salem	66 min
Aug 28, 4:49 PM EDT	Severe Thunderstorm Warning	PHI	Burlington, Mercer, Middlesex, Monmouth, Ocean	56 min
Aug 28, 4:55 PM EDT	Special Marine Warning	PHI		95 min
Aug 28, 5:13 PM EDT	Special Marine Warning	PHI		92 min
Aug 28, 5:37 PM EDT	Special Marine Warning	PHI		83 min
Aug 28, 5:51 PM EDT	Special Marine Warning	PHI		84 min
Aug 28, 6:53 PM EDT	Special Marine Warning	PHI		64 min
Aug 28, 7:55 PM EDT	Special Marine Warning	PHI		65 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.