Alert archive / New Jersey / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 20, NWS Philadelphia/Mount Holly

April 21, 2021Atlantic County, Burlington County, Ocean County, New Jersey

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Apr 21, 2021, 2:50 PM EDT for Atlantic County, Burlington County, Ocean County, New Jersey. It was in force for 40 min. 7 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: Apr 21, 2021, 2:50 PM EDT (18:50 UTC)
Expired: Apr 21, 2021, 3:30 PM EDT
In force: 40 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, Ocean County, NJ

The radar

The Philadelphia radar (KDIX), 48 km from the middle of the area, began a volume at 18:50 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
Apr 21, 2:54 PM EDT	TSTM WND GST 63	Atlantic City Internati, NJ	ASOS STATION KACY ATLANTIC CITY GUSTED TO 63 MPH.
Apr 21, 3:00 PM EDT	TSTM WND DMG	1 S Galloway Twp, NJ	TREES DOWN AT 6TH AVE AND RIDGEWOOD ST. EMERGENCY MANAGEMENT REPORT RELAYED BY BROADCAST MEDIA. TIME ESTIMATED FROM RADAR.
Apr 21, 3:12 PM EDT	TSTM WND GST 62	5 Se Mystic Island, NJ	CORRECTS PREVIOUS TSTM WND GST REPORT FROM 5 SE MYSTIC ISLAND.
Apr 21, 3:12 PM EDT	TSTM WND GST 62	5 Se Mystic Island, NJ
Apr 21, 3:12 PM EDT	MARINE TSTM WIND 62	5 Se Mystic Island, NJ	RUTGERS/ TUCKERTON MESONET GUST TO 62 MPH.
Apr 21, 3:15 PM EDT	HAIL 0.25	Little Egg Harbor Twp, NJ
Apr 21, 3:16 PM EDT	TSTM WND GST 62	2 Sw Beach Haven, NJ	CWOP SITE EW4321.

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
Apr 21, 12:28 PM EDT	Severe Thunderstorm Watch	SPC	5 hr

The nearest sounding before it

Wallops Is Stn, VA (KWAL), launched 12:00Z, 6.8 hours before the alert went out and 194 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: 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.

163 
WUUS51 KPHI 211850
SVRPHI
NJC001-005-029-211930-
/O.NEW.KPHI.SV.W.0020.210421T1850Z-210421T1930Z/

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

The National Weather Service in Mount Holly NJ has issued a

* Severe Thunderstorm Warning for...
  Central Atlantic County in southern New Jersey...
  South central Ocean County in southern New Jersey...
  Southeastern Burlington County in southern New Jersey...

* Until 330 PM EDT.

* At 249 PM EDT, a severe thunderstorm was located near
  Elwood-Magnolia, or 15 miles northwest of Atlantic City, moving
  east at 55 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...
  Barnegat, Hammonton, Absecon, Egg Harbor City, Tuckerton, Weymouth,
  Surf City, Port Republic, Pomona, Elwood-Magnolia, Wading River,
  Bass River State Forest, Batsto, New Gretna, Beach Haven West, Mays
  Landing, Mystic Island, Folsom, Manahawkin and Ocean Acres.

This includes the following highways...
 Garden State Parkway between mile markers 38 and 66.
 Atlantic City Expressway between mile markers 8 and 26.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3941 7468 3959 7484 3975 7422 3956 7413
      3942 7445
TIME...MOT...LOC 1849Z 251DEG 50KT 3951 7469 

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

JEO

3 follow-up statements

794 
WWUS51 KPHI 211859 RRA
SVSPHI

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

NJC001-005-029-211930-
/O.CON.KPHI.SV.W.0020.000000T0000Z-210421T1930Z/
Atlantic NJ-Ocean NJ-Burlington NJ-
259 PM EDT Wed Apr 21 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 330 PM EDT
FOR CENTRAL ATLANTIC...SOUTH CENTRAL OCEAN AND SOUTHEASTERN
BURLINGTON COUNTIES...

At 258 PM EDT, a severe thunderstorm was located over Port Republic,
or 12 miles north of Atlantic City, moving east at 60 mph.

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

SOURCE...Radar indicated. A wind gust of 63 mph was also measured at 
         Atlantic City International Airport.

IMPACT...Minor damage to vehicles is possible. Wind damage to roofs, 
         siding, trees, and power lines is possible.

Locations impacted include...
Barnegat, Absecon, Egg Harbor City, Tuckerton, Surf City, Port
Republic, Pomona, Elwood-Magnolia, Wading River, Bass River State
Forest, Batsto, New Gretna, Beach Haven West, Mystic Island,
Manahawkin and Ocean Acres.

This includes the following highways...
 Garden State Parkway between mile markers 38 and 66.
 Atlantic City Expressway between mile markers 8 and 21.

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.

&&

LAT...LON 3942 7445 3941 7468 3946 7468 3961 7477
      3975 7422 3956 7413
TIME...MOT...LOC 1858Z 251DEG 50KT 3955 7453 

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

JEO

023 
WWUS51 KPHI 211909
SVSPHI

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

NJC001-005-029-211930-
/O.CON.KPHI.SV.W.0020.000000T0000Z-210421T1930Z/
Atlantic NJ-Ocean NJ-Burlington NJ-
309 PM EDT Wed Apr 21 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 330 PM EDT
FOR EAST CENTRAL ATLANTIC...SOUTH CENTRAL OCEAN AND SOUTHEASTERN
BURLINGTON COUNTIES...

At 309 PM EDT, a severe thunderstorm was located over Tuckerton, or
15 miles northeast 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...
Barnegat, Absecon, Egg Harbor City, Tuckerton, Surf City, Port
Republic, Wading River, Bass River State Forest, New Gretna, Beach
Haven West, Mystic Island, Manahawkin and Ocean Acres.

This includes Garden State Parkway between mile markers 43 and 66.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3942 7445 3944 7453 3951 7452 3965 7460
      3969 7449 3975 7422 3956 7413
TIME...MOT...LOC 1909Z 270DEG 50KT 3959 7434 

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

JEO

016 
WWUS51 KPHI 211929
SVSPHI

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

NJC001-005-029-211935-
/O.EXP.KPHI.SV.W.0020.000000T0000Z-210421T1930Z/
Atlantic NJ-Ocean NJ-Burlington NJ-
329 PM EDT Wed Apr 21 2021

...THE SEVERE THUNDERSTORM WARNING FOR EAST CENTRAL ATLANTIC...SOUTH
CENTRAL OCEAN AND SOUTHEASTERN BURLINGTON COUNTIES 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 3942 7445 3944 7453 3951 7452 3965 7460
      3969 7449 3975 7422 3956 7413
TIME...MOT...LOC 1925Z 251DEG 50KT 3966 7408 

$$

JEO

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 20, 8:48 PM EDT	Freeze Watch	PHI	Hunterdon, Morris, Somerset, Sussex, Warren	7 hr
Apr 21, 3:26 AM EDT	Freeze Warning	PHI	Hunterdon, Morris, Somerset, Sussex, Warren	30 hr
Apr 21, 12:25 PM EDT	Severe Thunderstorm Warning	PHI	Warren	50 min
Apr 21, 12:51 PM EDT	Severe Thunderstorm Warning	PHI	Sussex, Warren	21 min
Apr 21, 12:55 PM EDT	Severe Thunderstorm Warning	PHI	Hunterdon, Warren	27 min
Apr 21, 1:10 PM EDT	Severe Thunderstorm Warning	PHI	Burlington, Camden, Gloucester, Mercer, Salem	50 min
Apr 21, 1:17 PM EDT	Special Weather Statement	PHI	Hunterdon, Morris, Somerset, Sussex	58 min
Apr 21, 1:28 PM EDT	Severe Thunderstorm Warning	PHI	Atlantic, Burlington, Camden, Gloucester	36 min
Apr 21, 1:30 PM EDT	Special Marine Warning	PHI		60 min
Apr 21, 1:43 PM EDT	Severe Thunderstorm Warning	PHI	Hunterdon, Middlesex, Morris, Somerset	33 min
Apr 21, 1:58 PM EDT	Special Weather Statement	PHI	Burlington, Camden, Monmouth, Ocean	62 min
Apr 21, 2:02 PM EDT	Severe Thunderstorm Warning	PHI	Burlington, Camden, Monmouth, Ocean	43 min
Apr 21, 2:03 PM EDT	Special Weather Statement	PHI	Cumberland	27 min
Apr 21, 2:17 PM EDT	Severe Thunderstorm Warning	PHI	Atlantic, Cumberland, Gloucester, Salem	43 min
Apr 21, 2:28 PM EDT	Special Weather Statement	PHI	Middlesex, Monmouth	47 min
Apr 21, 2:30 PM EDT	Special Marine Warning	PHI		60 min
Apr 21, 2:38 PM EDT	Severe Thunderstorm Warning	PHI	Monmouth, Ocean	37 min
Apr 21, 2:40 PM EDT	Special Marine Warning	PHI		55 min
Apr 21, 2:43 PM EDT	Special Weather Statement	PHI	Cape May	32 min
Apr 21, 3:02 PM EDT	Severe Thunderstorm Warning	PHI	Atlantic	28 min
Apr 21, 3:07 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.