Alert archive / New Jersey / Severe Thunderstorm Warnings in 2018

Severe Thunderstorm Warning 95, NWS Philadelphia/Mount Holly

September 7, 2018Atlantic County, Cape May County, New Jersey

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Sep 7, 2018, 2:20 PM EDT for Atlantic County, Cape May County, New Jersey. It was in force for 30 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: Sep 7, 2018, 2:20 PM EDT (18:20 UTC)
Expired: Sep 7, 2018, 2:50 PM EDT
In force: 30 min
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon
Hail: 0.88 in
Wind: 60.0 mph

Counties Atlantic County, NJ, Cape May County, NJ

The radar

The Philadelphia radar (KDIX), 77 km from the middle of the area, began a volume at 18:21 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, 6.3 hours before the alert went out and 163 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: 1722 J/kg
Mixed-layer CIN: -28 J/kg
Mixed-layer LCL: 884 m above ground
0-6 km bulk shear: 8 kt
0-1 km storm-relative helicity: -8 m²/s²
0-3 km storm-relative helicity: -19 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

385 
WUUS51 KPHI 071820
SVRPHI
NJC001-009-071915-
/O.NEW.KPHI.SV.W.0095.180907T1820Z-180907T1915Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Mount Holly NJ
220 PM EDT FRI SEP 7 2018

The National Weather Service in Mount Holly NJ has issued a

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

* Until 315 PM EDT.

* At 219 PM EDT, a severe thunderstorm was located over Corbin City,
  or 7 miles west of Ocean City, moving northeast at 5 mph.

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

  SOURCE...Radar indicated.

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

* Locations impacted include...
  Ocean City, Somers Point, Ventnor City, Margate City, Woodbine, Sea
  Isle City, Estell Manor, Longport, Corbin City, Belleplain Forest,
  Beesleys Point, English Creek, Seaville, Marmora, Strathmere and
  Linwood.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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.

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

&&

LAT...LON 3933 7448 3914 7468 3923 7490 3938 7481
TIME...MOT...LOC 1819Z 217DEG 5KT 3928 7475 

HAIL...0.88IN
WIND...60MPH
 
$$

Gorse

2 follow-up statements

679 
WWUS51 KPHI 071834
SVSPHI

Severe Weather Statement
National Weather Service Mount Holly NJ
234 PM EDT FRI SEP 7 2018

NJC001-009-071915-
/O.CON.KPHI.SV.W.0095.000000T0000Z-180907T1915Z/
Atlantic NJ-Cape May NJ-
234 PM EDT FRI SEP 7 2018

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 315 PM EDT
FOR SOUTH CENTRAL ATLANTIC AND NORTHERN CAPE MAY COUNTIES...

At 233 PM EDT, a severe thunderstorm was located over Corbin City, or
near Ocean City, moving northeast at 5 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...
Ocean City, Somers Point, Ventnor City, Margate City, Woodbine, Sea
Isle City, Estell Manor, Longport, Corbin City, Belleplain Forest,
Beesleys Point, English Creek, Seaville, Marmora, Strathmere and
Linwood.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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.

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

&&

LAT...LON 3933 7448 3914 7468 3923 7490 3938 7481
TIME...MOT...LOC 1833Z 217DEG 6KT 3931 7472 

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

Gorse

486 
WWUS51 KPHI 071850
SVSPHI

Severe Weather Statement
National Weather Service Mount Holly NJ
250 PM EDT FRI SEP 7 2018

NJC001-009-071900-
/O.CAN.KPHI.SV.W.0095.000000T0000Z-180907T1915Z/
Atlantic NJ-Cape May NJ-
250 PM EDT FRI SEP 7 2018

...THE SEVERE THUNDERSTORM WARNING FOR SOUTH CENTRAL ATLANTIC AND
NORTHERN CAPE MAY COUNTIES IS CANCELLED...
                
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 has been cancelled.

LAT...LON 3933 7448 3914 7468 3923 7490 3938 7481
TIME...MOT...LOC 1847Z 217DEG 5KT 3933 7470 

$$

Gorse

The office that day

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

Issued	Product	Office	Counties	Lasted
Sep 7, 4:22 AM EDT	Small Craft Advisory	PHI		35 hr
Sep 7, 12:59 PM EDT	Special Weather Statement	PHI	Cape May	46 min
Sep 7, 1:26 PM EDT	Severe Thunderstorm Warning	PHI	Cape May	31 min
Sep 7, 1:29 PM EDT	Areal Flood Advisory	PHI	Cape May	3 hr
Sep 7, 2:53 PM EDT	Special Weather Statement	PHI	Atlantic	37 min
Sep 7, 3:25 PM EDT	Special Weather Statement	PHI	Atlantic	50 min
Sep 7, 3:36 PM EDT	Gale Watch	PHI		24 hr
Sep 7, 5:27 PM EDT	Special Marine Warning	PHI		46 min
Sep 7, 6:32 PM EDT	Special Weather Statement	PHI	Camden	43 min
Sep 7, 6:41 PM EDT	Flash Flood Warning	PHI	Camden, Gloucester	4 hr
Sep 7, 7:08 PM EDT	Special Weather Statement	PHI	Camden	52 min
Sep 7, 7:19 PM EDT	Severe Thunderstorm Warning	PHI	Camden, Gloucester	56 min

Nearby

Severe Thunderstorm Warnings in New Jersey, 2018 Every severe thunderstorm warning in 2018

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.