Alert archive / New Jersey / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 205, NWS Philadelphia/Mount Holly

July 21, 2021Atlantic County, New Jersey

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Jul 21, 2021, 1:28 PM EDT for Atlantic County, New Jersey. It was in force for 47 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
Jul 21, 2021, 1:28 PM EDT (17:28 UTC)
Expired
Jul 21, 2021, 2:15 PM EDT
In force
47 min
Issued by
NWS Philadelphia/Mount Holly
Area
Storm-based polygon
Hail
1.0 in
Wind
60.0 mph

County Atlantic County, NJ

The radar

The Philadelphia radar (KDIX), 51 km from the middle of the area, began a volume at 17:30 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 watch it was issued in

The SPC watch in force over the same counties when this warning went out.

IssuedProductOfficeLasted
Jul 21, 11:56 AM EDTSevere Thunderstorm WatchSPC7 hr

The nearest sounding before it

Brookhaven, NY (KOKX), launched 12:00Z, 5.5 hours before the alert went out and 197 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, Brookhaven, NY at 12:00Z on 2021-07-21Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 130 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Brookhaven, NY at 12:00Z on 2021-07-21The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 22 square meters per square second.193958Sfc1 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
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.

203 
WUUS51 KPHI 211728
SVRPHI
NJC001-211815-
/O.NEW.KPHI.SV.W.0205.210721T1728Z-210721T1815Z/

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

The National Weather Service in Mount Holly NJ has issued a

* Severe Thunderstorm Warning for...
  East central Atlantic County in southern New Jersey...

* Until 215 PM EDT.

* At 127 PM EDT, a severe thunderstorm was located near Brigantine,
  or 7 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...
  Atlantic City, Brigantine and Absecon. 

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, and
the storm will affect the beaches. For your safety, immediately move
off the beach and seek shelter indoors.

&&

LAT...LON 3953 7423 3936 7440 3943 7453 3951 7435
      3950 7434 3952 7434 3951 7431 3952 7429
      3951 7428 3952 7427
TIME...MOT...LOC 1727Z 283DEG 18KT 3945 7433 

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

Gorse
1 follow-up statement
545 
WWUS51 KPHI 211746
SVSPHI

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

NJC001-211815-
/O.CON.KPHI.SV.W.0205.000000T0000Z-210721T1815Z/
Atlantic NJ-
146 PM EDT Wed Jul 21 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 215 PM EDT
FOR EASTERN ATLANTIC COUNTY...

At 145 PM EDT, a severe thunderstorm was located near Brigantine, or
8 miles northeast of Atlantic City, and is nearly stationary.

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...
Brigantine.

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, and
the storm will affect the beaches. For your safety, immediately move
off the beach and seek shelter indoors.

&&

LAT...LON 3941 7435 3944 7441 3950 7430 3949 7427
TIME...MOT...LOC 1745Z 274DEG 4KT 3945 7431 

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

Gorse

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 21, 11:09 AM EDTSpecial Weather StatementPHIMorris36 min
Jul 21, 12:41 PM EDTSpecial Weather StatementPHIOcean34 min
Jul 21, 12:46 PM EDTSpecial Marine WarningPHI89 min
Jul 21, 12:51 PM EDTSevere Thunderstorm WarningPHIAtlantic, Ocean39 min
Jul 21, 12:53 PM EDTSevere Thunderstorm WarningPHIOcean67 min
Jul 21, 1:43 PM EDTSevere Thunderstorm WarningPHIOcean49 min
Jul 21, 2:10 PM EDTSpecial Marine WarningPHI95 min
Jul 21, 2:13 PM EDTSevere Thunderstorm WarningPHIBurlington47 min
Jul 21, 2:35 PM EDTSpecial Marine WarningPHI55 min
Jul 21, 2:52 PM EDTSevere Thunderstorm WarningPHIOcean26 min
Jul 21, 3:04 PM EDTSevere Thunderstorm WarningPHIBurlington, Camden, Gloucester56 min
Jul 21, 3:16 PM EDTSevere Thunderstorm WarningPHIBurlington, Camden44 min
Jul 21, 3:27 PM EDTSevere Thunderstorm WarningPHICamden, Gloucester33 min
Jul 21, 3:43 PM EDTSevere Thunderstorm WarningPHIMonmouth, Ocean47 min
Jul 21, 3:48 PM EDTSpecial Marine WarningPHI57 min
Jul 21, 3:48 PM EDTSevere Thunderstorm WarningPHIBurlington, Camden42 min
Jul 21, 3:57 PM EDTSevere Thunderstorm WarningPHIAtlantic, Burlington, Camden, Gloucester, Salem33 min
Jul 21, 4:04 PM EDTSpecial Marine WarningPHI56 min
Jul 21, 4:17 PM EDTSpecial Marine WarningPHI58 min
Jul 21, 4:50 PM EDTSpecial Marine WarningPHI55 min
Jul 21, 5:07 PM EDTSpecial Marine WarningPHI23 min
Jul 21, 5:09 PM EDTSpecial Marine WarningPHI66 min
Jul 21, 5:24 PM EDTSpecial Marine WarningPHI46 min
Jul 21, 5:31 PM EDTSevere Thunderstorm WarningPHICape May29 min
Jul 21, 5:52 PM EDTSpecial Marine WarningPHI53 min

Nearby

Severe Thunderstorm Warnings in New Jersey, 2021Every 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.