Alert archive / New Jersey / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 18, NWS Philadelphia/Mount Holly

April 21, 2021Monmouth County, Ocean County, New Jersey

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Apr 21, 2021, 2:38 PM EDT for Monmouth County, Ocean County, New Jersey. It was in force for 37 min. 4 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, 2:38 PM EDT (18:38 UTC)
Expired: Apr 21, 2021, 3:15 PM EDT
In force: 37 min
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

Counties Monmouth County, NJ, Ocean County, NJ

The radar

The Philadelphia radar (KDIX), 44 km from the middle of the area, began a volume at 18:40 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, 2:41 PM EDT	TSTM WND DMG	2 Se Leisure Village Ea, NJ	GARDEN SHED BLOWN OVER, SECTION OF VINYL FENCE BROUGHT DOWN, AND SHINGLES BLOWN OFF HOUSE. TIME ESTIMATED FROM RADAR. SOCIAL MEDIA.
Apr 21, 2:43 PM EDT	HAIL 0.25	1 Ese Manahawkin, NJ
Apr 21, 2:44 PM EDT	HAIL 0.25	1 N Seaside Heights, NJ
Apr 21, 2:45 PM EDT	HAIL 0.25	Barnegat, 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
Apr 21, 12:28 PM EDT	Severe Thunderstorm Watch	SPC	5 hr

The nearest sounding before it

Brookhaven, NY (KOKX), launched 12:00Z, 6.6 hours before the alert went out and 122 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.

927 
WUUS51 KPHI 211838
SVRPHI
NJC025-029-211915-
/O.NEW.KPHI.SV.W.0018.210421T1838Z-210421T1915Z/

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

The National Weather Service in Mount Holly NJ has issued a

* Severe Thunderstorm Warning for...
  Northeastern Ocean County in southern New Jersey...
  Eastern Monmouth County in central New Jersey...

* Until 315 PM EDT.

* At 237 PM EDT, severe thunderstorms were located along a line
  extending from near Highlands to Holiday City South, 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, Long Branch, Asbury Park, Sandy Hook, Lakewood,
  Middletown, Barnegat, Tinton Falls, Red Bank, Beachwood, Manasquan,
  Highlands, Point Pleasant Beach, Seaside Heights, Farmingdale,
  Mantoloking, Allenwood, Elberon, Navesink and Brick Township.

This includes the following highways...
 Interstate 195 in New Jersey between mile markers 29 and 34.
 Garden State Parkway between mile markers 63 and 112.

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 3969 7399 3969 7439 4044 7410 4042 7405
      4042 7400 4041 7399 4041 7398 4047 7402
      4047 7401 4043 7397
TIME...MOT...LOC 1837Z 250DEG 47KT 4041 7394 3996 7420 

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

Davis

3 follow-up statements

078 
WWUS51 KPHI 211851
SVSPHI

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

NJC025-211901-
/O.CAN.KPHI.SV.W.0018.000000T0000Z-210421T1915Z/
Monmouth NJ-
251 PM EDT Wed Apr 21 2021

...THE SEVERE THUNDERSTORM WARNING FOR EASTERN MONMOUTH COUNTY IS
CANCELLED...

The storms which prompted the warning have moved out of the warned 
area. Therefore, the warning has been cancelled.

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

LAT...LON 3969 7439 4012 7405 4011 7405 4010 7403
      3969 7399
TIME...MOT...LOC 1851Z 250DEG 47KT 4047 7372 4002 7398 

$$

NJC029-211915-
/O.CON.KPHI.SV.W.0018.000000T0000Z-210421T1915Z/
Ocean NJ-
251 PM EDT Wed Apr 21 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 315 PM EDT
FOR EAST CENTRAL OCEAN COUNTY...

At 251 PM EDT, severe thunderstorms were located along a line
extending from 8 miles south of Atlantic Beach to near Mantoloking,
moving east at 55 mph.

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

SOURCE...Trained weather spotters.

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

Locations impacted include...
Toms River, Barnegat, Beachwood, Manasquan, Point Pleasant Beach,
Seaside Heights, Mantoloking, Dover Beaches North, Brookville, Dover
Beaches South, Point Pleasant, Brielle, Island Heights, Bay Head,
Ocean Acres, Gilford Park, Manahawkin and Waretown.

This includes Garden State Parkway between mile markers 63 and 79.
 
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 3969 7439 4012 7405 4011 7405 4010 7403
      3969 7399
TIME...MOT...LOC 1851Z 250DEG 47KT 4047 7372 4002 7398 

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

Davis

566 
WWUS51 KPHI 211859
SVSPHI

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

NJC029-211915-
/O.CON.KPHI.SV.W.0018.000000T0000Z-210421T1915Z/
Ocean NJ-
259 PM EDT Wed Apr 21 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 315 PM EDT
FOR EAST CENTRAL OCEAN COUNTY...

At 259 PM EDT, severe thunderstorms were located along a line
extending from 6 miles south of Lido Beach to 10 miles east of
Mantoloking, moving east at 55 mph.

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

SOURCE...Trained weather spotters.

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

Locations impacted include...
Barnegat, Seaside Heights, Dover Beaches South, Ocean Acres and
Waretown.

This includes Garden State Parkway between mile markers 66 and 72.
 
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 3969 7408 3969 7422 3975 7431 3999 7404
TIME...MOT...LOC 1859Z 250DEG 47KT 4050 7360 4005 7386 

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

Davis

872 
WWUS51 KPHI 211906
SVSPHI

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

NJC029-211916-
/O.EXP.KPHI.SV.W.0018.000000T0000Z-210421T1915Z/
Ocean NJ-
306 PM EDT Wed Apr 21 2021

...THE SEVERE THUNDERSTORM WARNING FOR EAST CENTRAL OCEAN COUNTY WILL
EXPIRE AT 315 PM EDT...
    
The storms which prompted the warning have 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 3969 7408 3969 7422 3975 7431 3999 7404
TIME...MOT...LOC 1906Z 250DEG 47KT 4052 7353 4007 7379 

$$

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, 2:02 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, 2:40 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.