Alert archive / New Jersey / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 167, NWS Philadelphia/Mount Holly

July 12, 2021Middlesex County, Monmouth County, New Jersey

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Jul 12, 2021, 3:31 PM EDT for Middlesex County, Monmouth County, New Jersey. It was in force for 41 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: Jul 12, 2021, 3:31 PM EDT (19:31 UTC)
Expired: Jul 12, 2021, 4:12 PM EDT
In force: 41 min
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon
Hail: 0.88 in
Wind: 60.0 mph

Counties Middlesex County, NJ, Monmouth County, NJ

The radar

The Philadelphia radar (KDIX), 61 km from the middle of the area, began a volume at 19:34 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
Jul 12, 3:32 PM EDT	TSTM WND DMG	Spotswood, NJ	A COUPLE OF REPORTS OF DOWNED WIRES IN THE SPOTSWOOD AREA. TIME ESTIMATED FROM RADAR.
Jul 12, 3:34 PM EDT	TSTM WND DMG	Marlboro Twp, NJ	STORM OUTFLOW DAMAGED POWER LINES NEAR WYNCREST ROAD. TIME ESTIMATED FROM RADAR.

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The nearest sounding before it

Brookhaven, NY (KOKX), launched 12:00Z, 7.5 hours before the alert went out and 120 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: 857 J/kg
Mixed-layer CIN: -57 J/kg
Mixed-layer LCL: 697 m above ground
0-6 km bulk shear: 25 kt
0-1 km storm-relative helicity: 85 m²/s²
0-3 km storm-relative helicity: 114 m²/s²
Significant tornado parameter: 0.2
Supercell composite: 2.4

Open this sounding in Storm Lab

The text

As transmitted.

567 
WUUS51 KPHI 121931
SVRPHI
NJC023-025-122030-
/O.NEW.KPHI.SV.W.0167.210712T1931Z-210712T2030Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Mount Holly NJ
331 PM EDT Mon Jul 12 2021

The National Weather Service in Mount Holly NJ has issued a

* Severe Thunderstorm Warning for...
  Northeastern Monmouth County in central New Jersey...
  Middlesex County in northern New Jersey...

* Until 430 PM EDT.

* At 331 PM EDT, a severe thunderstorm was located over East
  Brunswick, or near New Brunswick, moving northeast at 15 mph.

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

  SOURCE...Radar indicated.

  IMPACT...Damage to roofs, siding, trees, and power lines is 
           possible.

* Locations impacted include...
  New Brunswick, Perth Amboy, Sandy Hook, Edison, Middletown, Old
  Bridge, East Brunswick, Sayreville, North Brunswick, Marlboro,
  Carteret, Tinton Falls, Holmdel, Red Bank, Keansburg, Matawan,
  Jamesburg, Highlands, Brownville and Yorketown.

This includes the following highways...
 New Jersey Turnpike between exits 10 and 12.
 Interstate 287 in New Jersey between mile markers 0 and 3.
 Garden State Parkway between mile markers 110 and 132.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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.

Torrential rainfall is occurring with this storm, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.

&&

LAT...LON 4035 7397 4027 7441 4043 7452 4054 7441
      4060 7430 4059 7420 4056 7421 4055 7425
      4050 7426 4050 7428 4046 7426 4044 7420
      4046 7418 4045 7413 4041 7399 4048 7402
      4047 7399 4043 7397
TIME...MOT...LOC 1931Z 243DEG 14KT 4039 7441 

HAIL...0.88IN
WIND...60MPH
 
$$

CMS

3 follow-up statements

577 
WWUS51 KPHI 121945
SVSPHI

Severe Weather Statement
National Weather Service Mount Holly NJ
345 PM EDT Mon Jul 12 2021

NJC023-025-122030-
/O.CON.KPHI.SV.W.0167.000000T0000Z-210712T2030Z/
Monmouth NJ-Middlesex NJ-
345 PM EDT Mon Jul 12 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 430 PM EDT
FOR NORTHEASTERN MONMOUTH AND MIDDLESEX COUNTIES...

At 344 PM EDT, a severe thunderstorm was located over Old Bridge, or 
7 miles southeast of New Brunswick, moving northeast at 15 mph. 
Power outages have been reported in the Jamesburg area.

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

SOURCE...Radar indicated.

IMPACT...Damage to roofs, siding, trees, and power lines is 
         possible.

Locations impacted include...
New Brunswick, Perth Amboy, Sandy Hook, Edison, Middletown, Old
Bridge, East Brunswick, Sayreville, North Brunswick, Marlboro,
Carteret, Tinton Falls, Holmdel, Red Bank, Keansburg, Matawan,
Jamesburg, Highlands, Brownville and Yorketown.

This includes the following highways...
 New Jersey Turnpike between exits 10 and 12.
 Interstate 287 in New Jersey between mile markers 0 and 3.
 Garden State Parkway between mile markers 110 and 132.

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. Move
indoors immediately. Lightning is one of nature's leading killers.
Remember, if you can hear thunder, you are close enough to be struck
by lightning.

Torrential rainfall is occurring with this storm, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.

&&

LAT...LON 4035 7397 4027 7441 4043 7452 4054 7441
      4060 7430 4059 7420 4056 7421 4055 7425
      4050 7426 4050 7428 4046 7426 4044 7420
      4046 7418 4045 7413 4041 7399 4048 7402
      4047 7399 4043 7397
TIME...MOT...LOC 1944Z 243DEG 14KT 4041 7435 

HAIL...0.88IN
WIND...60MPH
 
$$

CMS

959 
WWUS51 KPHI 122002
SVSPHI

Severe Weather Statement
National Weather Service Mount Holly NJ
402 PM EDT Mon Jul 12 2021

NJC023-025-122030-
/O.CON.KPHI.SV.W.0167.000000T0000Z-210712T2030Z/
Monmouth NJ-Middlesex NJ-
402 PM EDT Mon Jul 12 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 430 PM EDT
FOR NORTHEASTERN MONMOUTH AND NORTHEASTERN MIDDLESEX COUNTIES...

At 402 PM EDT, a severe thunderstorm was located over Perth Amboy,
moving northeast at 20 mph.

HAZARD...60 mph wind gusts.

SOURCE...Law enforcement.

IMPACT...Damage to roofs, siding, trees, and power lines is 
         possible.

Locations impacted include...
Perth Amboy, Sandy Hook, Edison, Middletown, Old Bridge, Sayreville,
Carteret, Red Bank, Matawan, Highlands, Brownville, Navesink,
Colonia, Lincroft, Woodbridge, Metuchen, Keyport, Rumson, Iselin and
Port Reading.

This includes the following highways...
 New Jersey Turnpike between exits 11 and 12.
 Interstate 287 in New Jersey between mile markers 0 and 1.
 Garden State Parkway between mile markers 113 and 133.

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. Move
indoors immediately. Lightning is one of nature's leading killers.
Remember, if you can hear thunder, you are close enough to be struck
by lightning.

Torrential rainfall is occurring with this storm, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.

&&

LAT...LON 4035 7397 4037 7433 4056 7438 4060 7430
      4059 7421 4056 7421 4055 7425 4050 7426
      4050 7428 4046 7426 4044 7420 4046 7418
      4041 7399 4043 7399 4048 7402 4047 7399
      4043 7397
TIME...MOT...LOC 2002Z 225DEG 16KT 4048 7428 

HAIL...<.75IN
WIND...60MPH
 
$$

CMS

495 
WWUS51 KPHI 122012
SVSPHI

Severe Weather Statement
National Weather Service Mount Holly NJ
412 PM EDT Mon Jul 12 2021

NJC023-025-122022-
/O.CAN.KPHI.SV.W.0167.000000T0000Z-210712T2030Z/
Monmouth NJ-Middlesex NJ-
412 PM EDT Mon Jul 12 2021

...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN MONMOUTH AND
NORTHEASTERN MIDDLESEX COUNTIES IS CANCELLED...
        
The storm which prompted the warning has weakened below severe 
limits, and is exiting the warned area. Therefore, the warning has 
been cancelled.

A Severe Thunderstorm Watch remains in effect until 1100 PM EDT for
northern and central New Jersey.

To report severe weather, contact your nearest law enforcement
agency. They will relay your report to the National Weather Service
Mount Holly NJ.

LAT...LON 4035 7397 4037 7433 4056 7438 4060 7430
      4059 7421 4056 7421 4055 7425 4050 7426
      4050 7428 4046 7426 4044 7420 4046 7418
      4041 7399 4043 7399 4048 7402 4047 7399
      4043 7397
TIME...MOT...LOC 2010Z 243DEG 14KT 4050 7423 

$$

CMS

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 12, 1:59 PM EDT	Areal Flood Advisory	PHI	Burlington, Camden	3 hr
Jul 12, 2:12 PM EDT	Flash Flood Warning Emergency	PHI	Burlington	7 hr
Jul 12, 2:20 PM EDT	Areal Flood Advisory	PHI	Mercer, Middlesex, Monmouth	3 hr
Jul 12, 2:37 PM EDT	Flash Flood Warning	PHI	Mercer, Middlesex, Monmouth	93 min
Jul 12, 3:08 PM EDT	Severe Thunderstorm Warning	PHI	Burlington, Mercer, Middlesex, Monmouth, Ocean	67 min
Jul 12, 4:26 PM EDT	Special Marine Warning	PHI		2 hr
Jul 12, 4:33 PM EDT	Severe Thunderstorm Warning	PHI	Monmouth, Ocean	42 min
Jul 12, 4:52 PM EDT	Areal Flood Advisory	PHI	Monmouth, Ocean	98 min
Jul 12, 5:08 PM EDT	Areal Flood Advisory	PHI	Sussex	5 hr
Jul 12, 5:08 PM EDT	Severe Thunderstorm Warning	PHI	Burlington, Camden, Mercer	67 min
Jul 12, 5:26 PM EDT	Areal Flood Advisory	PHI	Camden	2 hr
Jul 12, 5:36 PM EDT	Special Weather Statement	PHI	Sussex	24 min
Jul 12, 5:41 PM EDT	Areal Flood Advisory	PHI	Burlington	83 min
Jul 12, 5:57 PM EDT	Severe Thunderstorm Warning	PHI	Morris, Sussex	63 min
Jul 12, 6:01 PM EDT	Flash Flood Warning	PHI	Camden	102 min
Jul 12, 6:08 PM EDT	Areal Flood Advisory	PHI	Morris	98 min
Jul 12, 6:43 PM EDT	Areal Flood Advisory	PHI	Burlington, Camden, Gloucester	93 min
Jul 12, 6:52 PM EDT	Severe Thunderstorm Warning	PHI	Morris, Sussex	34 min
Jul 12, 7:00 PM EDT	Areal Flood Advisory	PHI	Gloucester, Salem	112 min
Jul 12, 7:06 PM EDT	Severe Thunderstorm Warning	PHI	Salem	69 min
Jul 12, 7:11 PM EDT	Flash Flood Warning	PHI	Morris, Sussex	35 min
Jul 12, 7:33 PM EDT	Special Marine Warning	PHI		58 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.