Alert archive / New Jersey / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 21, NWS Philadelphia/Mount Holly

April 21, 2021Atlantic County, New Jersey

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Apr 21, 2021, 3:02 PM EDT for Atlantic County, New Jersey. It was in force for 28 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
Apr 21, 2021, 3:02 PM EDT (19:02 UTC)
Expired
Apr 21, 2021, 3:30 PM EDT
In force
28 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), 61 km from the middle of the area, began a volume at 19:06 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
Apr 21, 12:28 PM EDTSevere Thunderstorm WatchSPC5 hr

The nearest sounding before it

Wallops Is Stn, VA (KWAL), launched 12:00Z, 7.0 hours before the alert went out and 185 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 2021-04-21Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 12 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, Wallops Is Stn, VA at 12:00Z on 2021-04-21The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 136 square meters per square second.1939587897Sfc1 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
12 J/kg
Mixed-layer CIN
-142 J/kg
Mixed-layer LCL
1437 m above ground
0-6 km bulk shear
35 kt
0-1 km storm-relative helicity
136 m²/s²
0-3 km storm-relative helicity
126 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted.

524 
WUUS51 KPHI 211902
SVRPHI
NJC001-211930-
/O.NEW.KPHI.SV.W.0021.210421T1902Z-210421T1930Z/

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

The National Weather Service in Mount Holly NJ has issued a

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

* Until 330 PM EDT.

* At 302 PM EDT, a severe thunderstorm was located over Atlantic
  City, moving east at 60 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, Pleasantville, Ventnor City, Brigantine, Northfield,
  Absecon, Margate City, Longport and Linwood.

People at the Atlantic County Mega Site should seek safe shelter
immediately!

This includes the following highways...
 Garden State Parkway between mile markers 36 and 38.
 Atlantic City Expressway between mile markers 0 and 8.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

&&

LAT...LON 3938 7428 3929 7453 3942 7457 3952 7429
TIME...MOT...LOC 1902Z 255DEG 51KT 3940 7446 

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

JEO
2 follow-up statements
619 
WWUS51 KPHI 211916
SVSPHI

Severe Weather Statement
National Weather Service Mount Holly NJ
316 PM EDT Wed Apr 21 2021

NJC001-211930-
/O.CON.KPHI.SV.W.0021.000000T0000Z-210421T1930Z/
Atlantic NJ-
316 PM EDT Wed Apr 21 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 330 PM EDT
FOR SOUTHEASTERN ATLANTIC COUNTY...

At 316 PM EDT, a severe thunderstorm was located 9 miles east of
Brigantine, or 14 miles east of Atlantic City, moving east at 60 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 and Brigantine. 

People at the Atlantic County Mega Site should seek safe shelter
immediately!

This includes Atlantic City Expressway near mile marker 0.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

&&

LAT...LON 3938 7428 3930 7451 3938 7443 3944 7441
      3952 7429
TIME...MOT...LOC 1916Z 255DEG 51KT 3945 7420 

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

JEO
951 
WWUS51 KPHI 211923
SVSPHI

Severe Weather Statement
National Weather Service Mount Holly NJ
323 PM EDT Wed Apr 21 2021

NJC001-211932-
/O.EXP.KPHI.SV.W.0021.000000T0000Z-210421T1930Z/
Atlantic NJ-
323 PM EDT Wed Apr 21 2021

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN ATLANTIC COUNTY
WILL EXPIRE AT 330 PM EDT...
        
The storm which prompted the warning has moved out of the area.
Therefore, the warning will be allowed to expire.

A Severe Thunderstorm Watch remains in effect until 600 PM EDT for
southern New Jersey.

LAT...LON 3938 7428 3930 7451 3938 7443 3944 7441
      3952 7429
TIME...MOT...LOC 1922Z 255DEG 51KT 3946 7413 

$$

JEO

The office that day

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

IssuedProductOfficeCountiesLasted
Apr 20, 8:48 PM EDTFreeze WatchPHIHunterdon, Morris, Somerset, Sussex, Warren7 hr
Apr 21, 3:26 AM EDTFreeze WarningPHIHunterdon, Morris, Somerset, Sussex, Warren30 hr
Apr 21, 12:25 PM EDTSevere Thunderstorm WarningPHIWarren50 min
Apr 21, 12:51 PM EDTSevere Thunderstorm WarningPHISussex, Warren21 min
Apr 21, 12:55 PM EDTSevere Thunderstorm WarningPHIHunterdon, Warren27 min
Apr 21, 1:10 PM EDTSevere Thunderstorm WarningPHIBurlington, Camden, Gloucester, Mercer, Salem50 min
Apr 21, 1:17 PM EDTSpecial Weather StatementPHIHunterdon, Morris, Somerset, Sussex58 min
Apr 21, 1:28 PM EDTSevere Thunderstorm WarningPHIAtlantic, Burlington, Camden, Gloucester36 min
Apr 21, 1:30 PM EDTSpecial Marine WarningPHI60 min
Apr 21, 1:43 PM EDTSevere Thunderstorm WarningPHIHunterdon, Middlesex, Morris, Somerset33 min
Apr 21, 1:58 PM EDTSpecial Weather StatementPHIBurlington, Camden, Monmouth, Ocean62 min
Apr 21, 2:02 PM EDTSevere Thunderstorm WarningPHIBurlington, Camden, Monmouth, Ocean43 min
Apr 21, 2:03 PM EDTSpecial Weather StatementPHICumberland27 min
Apr 21, 2:17 PM EDTSevere Thunderstorm WarningPHIAtlantic, Cumberland, Gloucester, Salem43 min
Apr 21, 2:28 PM EDTSpecial Weather StatementPHIMiddlesex, Monmouth47 min
Apr 21, 2:30 PM EDTSpecial Marine WarningPHI60 min
Apr 21, 2:38 PM EDTSevere Thunderstorm WarningPHIMonmouth, Ocean37 min
Apr 21, 2:40 PM EDTSpecial Marine WarningPHI55 min
Apr 21, 2:43 PM EDTSpecial Weather StatementPHICape May32 min
Apr 21, 2:50 PM EDTSevere Thunderstorm WarningPHIAtlantic, Burlington, Ocean40 min
Apr 21, 3:07 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.