Alert archive / New Jersey / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 15, NWS Philadelphia/Mount Holly

April 21, 20214 counties in New Jersey

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Apr 21, 2021, 2:02 PM EDT for 4 counties in New Jersey. It was in force for 43 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: Apr 21, 2021, 2:02 PM EDT (18:02 UTC)
Expired: Apr 21, 2021, 2:45 PM EDT
In force: 43 min
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

Counties Burlington County, NJ, Camden County, NJ, Monmouth County, NJ, Ocean County, NJ

The radar

The Philadelphia radar (KDIX), 17 km from the middle of the area, began a volume at 18:04 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, 2:22 PM EDT	HAIL 1	2 Nw Berkeley Twp, NJ	AN MPING REPORT OF QUARTER SIZE HAIL. TIME ESTIMATED FROM RADAR.
Apr 21, 2:25 PM EDT	HAIL 0.25	2 Wsw Lakehurst, NJ	SOCIAL MEDIA.

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

Brookhaven, NY (KOKX), launched 12:00Z, 6.0 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 1427 m above ground
0-6 km bulk shear: 37 kt
0-1 km storm-relative helicity: 206 m²/s²
0-3 km storm-relative helicity: 201 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

974 
WUUS51 KPHI 211802
SVRPHI
NJC005-007-025-029-211845-
/O.NEW.KPHI.SV.W.0015.210421T1802Z-210421T1845Z/

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

The National Weather Service in Mount Holly NJ has issued a

* Severe Thunderstorm Warning for...
  Northwestern Ocean County in southern New Jersey...
  Southeastern Camden County in southern New Jersey...
  Northeastern Burlington County in southern New Jersey...
  South central Monmouth County in central New Jersey...

* Until 245 PM EDT.

* At 201 PM EDT, a severe thunderstorm was located over Presidential
  Lakes, or 20 miles west of Toms River, 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...
  Toms River, Lakewood, Jackson, Beachwood, Tabernacle, Shamong,
  Presidential Lakes Estates, Lakehurst, Farmingdale, Wrightstown,
  Leisure Village, Atsion, Holiday City South, Pleasant Plains, Cedar
  Glen West, Chatsworth, Leisure Village East, Cassville, Wharton
  State Forest and Presidential Lakes.

This includes the following highways...
 Interstate 195 in New Jersey between mile markers 25 and 32.
 Garden State Parkway between mile markers 70 and 92.

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.

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 3979 7421 3971 7470 3973 7474 3969 7478
      3969 7480 3990 7468 4004 7465 4021 7412
TIME...MOT...LOC 1801Z 254DEG 46KT 3991 7456 

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

Davis

2 follow-up statements

308 
WWUS51 KPHI 211817
SVSPHI

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

NJC005-007-211827-
/O.CAN.KPHI.SV.W.0015.000000T0000Z-210421T1845Z/
Camden NJ-Burlington NJ-
217 PM EDT Wed Apr 21 2021

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN CAMDEN AND
NORTHEASTERN BURLINGTON COUNTIES IS CANCELLED...
    
The severe thunderstorm which prompted the warning has moved out of 
the warned area. Therefore, the warning has been cancelled.

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

LAT...LON 3979 7421 3978 7440 4007 7455 4021 7412
TIME...MOT...LOC 1817Z 254DEG 46KT 3997 7430 

$$

NJC025-029-211845-
/O.CON.KPHI.SV.W.0015.000000T0000Z-210421T1845Z/
Ocean NJ-Monmouth NJ-
217 PM EDT Wed Apr 21 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 245 PM EDT
FOR NORTHWESTERN OCEAN AND SOUTH CENTRAL MONMOUTH COUNTIES...

At 217 PM EDT, a severe thunderstorm was located over Holiday
City-Berkeley, or near Toms River, 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...
Toms River, Lakewood, Jackson, Beachwood, Lakehurst, Farmingdale,
Leisure Village, Holiday City South, Pleasant Plains, Cedar Glen
West, Leisure Village East, Cassville, Woodruff, Holiday
City-Berkeley, Bamber Lake, Ramtown, Cedar Glen Lakes, Whiting, Pine
Ridge At Crestwood and Freewood Acres.

This includes the following highways...
 Interstate 195 in New Jersey between mile markers 25 and 32.
 Garden State Parkway between mile markers 70 and 92.

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 3979 7421 3978 7440 4007 7455 4021 7412
TIME...MOT...LOC 1817Z 254DEG 46KT 3997 7430 

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

Davis

210 
WWUS51 KPHI 211842
SVSPHI

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

NJC025-029-211852-
/O.EXP.KPHI.SV.W.0015.000000T0000Z-210421T1845Z/
Ocean NJ-Monmouth NJ-
242 PM EDT Wed Apr 21 2021

...THE SEVERE THUNDERSTORM WARNING FOR NORTHWESTERN OCEAN AND SOUTH
CENTRAL MONMOUTH COUNTIES WILL EXPIRE AT 245 PM EDT...
        
The storm which prompted the warning has moved out of the area.
Therefore, the warning will be allowed to expire. However gusty 
winds are still possible with this thunderstorm.

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

LAT...LON 3979 7421 3978 7440 4007 7455 4021 7412
TIME...MOT...LOC 1842Z 254DEG 46KT 4005 7393 

$$

Davis

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, 2:03 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, 2:50 PM EDT	Severe Thunderstorm Warning	PHI	Atlantic, Burlington, Ocean	40 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.