Alert archive / New Jersey / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 206, NWS Philadelphia/Mount Holly

July 21, 2021Ocean County, New Jersey

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Jul 21, 2021, 1:43 PM EDT for Ocean County, New Jersey. It was in force for 49 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: Jul 21, 2021, 1:43 PM EDT (17:43 UTC)
Expired: Jul 21, 2021, 2:32 PM EDT
In force: 49 min
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

County Ocean County, NJ

The radar

The Philadelphia radar (KDIX), 37 km from the middle of the area, began a volume at 17:46 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
Jul 21, 1:50 PM EDT	HAIL 0.75	Manahawkin, NJ
Jul 21, 2:05 PM EDT	HAIL 1.25	Manahawkin, NJ

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
Jul 21, 11:56 AM EDT	Severe Thunderstorm Watch	SPC	7 hr

The nearest sounding before it

Brookhaven, NY (KOKX), launched 12:00Z, 5.7 hours before the alert went out and 182 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: 130 J/kg
Mixed-layer CIN: -165 J/kg
Mixed-layer LCL: 1495 m above ground
0-6 km bulk shear: 35 kt
0-1 km storm-relative helicity: 22 m²/s²
0-3 km storm-relative helicity: 48 m²/s²
Significant tornado parameter: 0.0
Supercell composite: -0.0

Open this sounding in Storm Lab

The text

As transmitted.

556 
WUUS51 KPHI 211743
SVRPHI
NJC029-211845-
/O.NEW.KPHI.SV.W.0206.210721T1743Z-210721T1845Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Mount Holly NJ
143 PM EDT Wed Jul 21 2021

The National Weather Service in Mount Holly NJ has issued a

* Severe Thunderstorm Warning for...
  Southeastern Ocean County in southern New Jersey...

* Until 245 PM EDT.

* At 142 PM EDT, a severe thunderstorm was located near Beach Haven
  West, or 20 miles northeast of Atlantic City, moving east at 20
  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...
  Tuckerton, Surf City, Beach Haven West, Manahawkin and Ocean Acres.

This includes Garden State Parkway between mile markers 56 and 66.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

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 3955 7423 3960 7439 3964 7439 3974 7431
      3972 7411
TIME...MOT...LOC 1742Z 291DEG 17KT 3964 7428 

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

Gorse

2 follow-up statements

114 
WWUS51 KPHI 211755
SVSPHI

Severe Weather Statement
National Weather Service Mount Holly NJ
155 PM EDT Wed Jul 21 2021

NJC029-211845-
/O.CON.KPHI.SV.W.0206.000000T0000Z-210721T1845Z/
Ocean NJ-
155 PM EDT Wed Jul 21 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 245 PM EDT
FOR SOUTHEASTERN OCEAN COUNTY...

At 154 PM EDT, a severe thunderstorm was located near Surf City, or
21 miles northeast of Atlantic City, moving east at 20 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...
Surf City, Beach Haven West and Manahawkin. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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 3957 7422 3959 7429 3965 7431 3973 7421
      3972 7411
TIME...MOT...LOC 1754Z 291DEG 17KT 3962 7421 

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

Gorse

606 
WWUS51 KPHI 211832
SVSPHI

Severe Weather Statement
National Weather Service Mount Holly NJ
232 PM EDT Wed Jul 21 2021

NJC029-211842-
/O.CAN.KPHI.SV.W.0206.000000T0000Z-210721T1845Z/
Ocean NJ-
232 PM EDT Wed Jul 21 2021

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN OCEAN COUNTY 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.  However gusty winds and
heavy rain are still possible with this thunderstorm.

A Severe Thunderstorm Watch remains in effect until 800 PM EDT for
southern New Jersey.

LAT...LON 3957 7422 3959 7429 3965 7431 3973 7421
      3972 7411
TIME...MOT...LOC 1830Z 291DEG 17KT 3955 7399 

$$

Gorse

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 21, 11:09 AM EDT	Special Weather Statement	PHI	Morris	36 min
Jul 21, 12:41 PM EDT	Special Weather Statement	PHI	Ocean	34 min
Jul 21, 12:46 PM EDT	Special Marine Warning	PHI		89 min
Jul 21, 12:51 PM EDT	Severe Thunderstorm Warning	PHI	Atlantic, Ocean	39 min
Jul 21, 12:53 PM EDT	Severe Thunderstorm Warning	PHI	Ocean	67 min
Jul 21, 1:28 PM EDT	Severe Thunderstorm Warning	PHI	Atlantic	47 min
Jul 21, 2:10 PM EDT	Special Marine Warning	PHI		95 min
Jul 21, 2:13 PM EDT	Severe Thunderstorm Warning	PHI	Burlington	47 min
Jul 21, 2:35 PM EDT	Special Marine Warning	PHI		55 min
Jul 21, 2:52 PM EDT	Severe Thunderstorm Warning	PHI	Ocean	26 min
Jul 21, 3:04 PM EDT	Severe Thunderstorm Warning	PHI	Burlington, Camden, Gloucester	56 min
Jul 21, 3:16 PM EDT	Severe Thunderstorm Warning	PHI	Burlington, Camden	44 min
Jul 21, 3:27 PM EDT	Severe Thunderstorm Warning	PHI	Camden, Gloucester	33 min
Jul 21, 3:43 PM EDT	Severe Thunderstorm Warning	PHI	Monmouth, Ocean	47 min
Jul 21, 3:48 PM EDT	Special Marine Warning	PHI		57 min
Jul 21, 3:48 PM EDT	Severe Thunderstorm Warning	PHI	Burlington, Camden	42 min
Jul 21, 3:57 PM EDT	Severe Thunderstorm Warning	PHI	Atlantic, Burlington, Camden, Gloucester, Salem	33 min
Jul 21, 4:04 PM EDT	Special Marine Warning	PHI		56 min
Jul 21, 4:17 PM EDT	Special Marine Warning	PHI		58 min
Jul 21, 4:50 PM EDT	Special Marine Warning	PHI		55 min
Jul 21, 5:07 PM EDT	Special Marine Warning	PHI		23 min
Jul 21, 5:09 PM EDT	Special Marine Warning	PHI		66 min
Jul 21, 5:24 PM EDT	Special Marine Warning	PHI		46 min
Jul 21, 5:31 PM EDT	Severe Thunderstorm Warning	PHI	Cape May	29 min
Jul 21, 5:52 PM EDT	Special Marine Warning	PHI		53 min

Nearby

Severe Thunderstorm Warnings in New Jersey, 2021 Every severe thunderstorm warning in 2021

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.