Alert archive / New Jersey / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 145, NWS Philadelphia/Mount Holly

July 8, 20214 counties in New Jersey

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Jul 8, 2021, 3:03 PM EDT for 4 counties in New Jersey. It was in force for 42 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 8, 2021, 3:03 PM EDT (19:03 UTC)
Expired: Jul 8, 2021, 3:45 PM EDT
In force: 42 min
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon
Tornado: Possible
Hail: 1.0 in
Wind: 60.0 mph

Counties Hunterdon County, NJ, Middlesex County, NJ, Morris County, NJ, Somerset County, NJ

The radar

The Philadelphia radar (KDIX), 83 km from the middle of the area, began a volume at 19:02 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 8, 3:13 PM EDT	TSTM WND DMG	Bedminster Twp, NJ	SEVERAL TREES DOWNED IN THE AREA OF BEDMINSTER AND FAR HILLS. TIME ESTIMATED FROM RADAR.
Jul 8, 3:15 PM EDT	TSTM WND DMG	Peapack, NJ	TREES WERE DOWNED IN PEAPACK. TIME ESTIMATED FROM RADAR.

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
Jul 8, 2:09 PM EDT	Severe Thunderstorm Watch	SPC	7 hr

The nearest sounding before it

Brookhaven, NY (KOKX), launched 12:00Z, 7.1 hours before the alert went out and 135 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: 973 J/kg
Mixed-layer CIN: -77 J/kg
Mixed-layer LCL: 751 m above ground
0-6 km bulk shear: 28 kt
0-1 km storm-relative helicity: 60 m²/s²
0-3 km storm-relative helicity: 93 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 1.3

Open this sounding in Storm Lab

The text

As transmitted.

219 
WUUS51 KPHI 081903
SVRPHI
NJC019-023-027-035-081945-
/O.NEW.KPHI.SV.W.0145.210708T1903Z-210708T1945Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Mount Holly NJ
303 PM EDT Thu Jul 8 2021

The National Weather Service in Mount Holly NJ has issued a

* Severe Thunderstorm Warning for...
  Northeastern Hunterdon County in northwestern New Jersey...
  Southeastern Morris County in northern New Jersey...
  Somerset County in northern New Jersey...
  North central Middlesex County in northern New Jersey...

* Until 345 PM EDT.

* At 302 PM EDT, a severe thunderstorm was located over White House
  Station, or 7 miles northwest of Somerville, moving northeast at 20
  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...
  Morristown, Somerville, Bridgewater, Madison, Middlesex, Florham
  Park, East Hanover, Bound Brook, Manville, Chatham, Mendham, High
  Bridge, Peapack And Gladstone, Lebanon, Far Hills, Flagtown,
  Martinsville, Millington, Cloverhill and White House Station.

This includes the following highways...
 Interstate 78 in New Jersey between mile markers 19 and 42.
 Interstate 80 in New Jersey near mile marker 48.
 Interstate 287 in New Jersey between mile markers 7 and 39.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4083 7433 4079 7437 4076 7438 4075 7436
      4067 7446 4066 7445 4066 7440 4063 7442
      4060 7446 4060 7437 4054 7447 4048 7481
      4066 7489 4087 7433
TIME...MOT...LOC 1902Z 242DEG 17KT 4062 7474 

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

NC

2 follow-up statements

382 
WWUS51 KPHI 081922
SVSPHI

Severe Weather Statement
National Weather Service Mount Holly NJ
322 PM EDT Thu Jul 8 2021

NJC019-081931-
/O.CAN.KPHI.SV.W.0145.000000T0000Z-210708T1945Z/
Hunterdon NJ-
322 PM EDT Thu Jul 8 2021

...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN HUNTERDON COUNTY
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 900 PM EDT for
northern and northwestern New Jersey.

LAT...LON 4076 7438 4075 7436 4067 7446 4066 7445
      4066 7440 4060 7446 4060 7437 4056 7449
      4057 7466 4061 7469 4063 7471 4072 7472
      4087 7433 4083 7433 4079 7437
TIME...MOT...LOC 1921Z 242DEG 17KT 4066 7463 

$$

NJC023-027-035-081945-
/O.CON.KPHI.SV.W.0145.000000T0000Z-210708T1945Z/
Morris NJ-Somerset NJ-Middlesex NJ-
322 PM EDT Thu Jul 8 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 345 PM EDT
FOR SOUTHEASTERN MORRIS...NORTHERN SOMERSET AND NORTH CENTRAL
MIDDLESEX COUNTIES...

At 321 PM EDT, a severe thunderstorm was located over Far Hills, or
near Somerville, moving northeast at 20 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...
Morristown, Somerville, Bridgewater, Madison, Middlesex, Florham
Park, East Hanover, Bound Brook, Chatham, Mendham, Peapack And
Gladstone, Far Hills, Martinsville, Millington, Basking Ridge, North
Plainfield, Bernardsville, Dunellen, Raritan and Watchung.

This includes the following highways...
 Interstate 78 in New Jersey between mile markers 28 and 42.
 Interstate 80 in New Jersey near mile marker 48.
 Interstate 287 in New Jersey between mile markers 14 and 39.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4076 7438 4075 7436 4067 7446 4066 7445
      4066 7440 4060 7446 4060 7437 4056 7449
      4057 7466 4061 7469 4063 7471 4072 7472
      4087 7433 4083 7433 4079 7437
TIME...MOT...LOC 1921Z 242DEG 17KT 4066 7463 

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

NC

948 
WWUS51 KPHI 081936
SVSPHI

Severe Weather Statement
National Weather Service Mount Holly NJ
336 PM EDT Thu Jul 8 2021

NJC023-027-035-081946-
/O.EXP.KPHI.SV.W.0145.000000T0000Z-210708T1945Z/
Morris NJ-Somerset NJ-Middlesex NJ-
336 PM EDT Thu Jul 8 2021

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN MORRIS...NORTHERN
SOMERSET AND NORTH CENTRAL MIDDLESEX COUNTIES WILL EXPIRE AT 345 PM
EDT...
        
The storm which prompted the warning has weakened below severe
limits, and has exited the warned area. Therefore, the warning will
be allowed to expire.

A Severe Thunderstorm Watch remains in effect until 900 PM EDT for
northern and northwestern 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 4076 7438 4075 7436 4067 7446 4066 7445
      4066 7440 4060 7446 4060 7437 4056 7449
      4057 7466 4061 7469 4063 7471 4072 7472
      4087 7433 4083 7433 4079 7437
TIME...MOT...LOC 1936Z 242DEG 17KT 4066 7464 

$$

NC

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 7, 11:06 PM EDT	Tropical Storm Warning	PHI	Atlantic, Burlington, Cape May, Monmouth, Ocean	32 hr
Jul 7, 11:37 PM EDT	Special Weather Statement	PHI	Sussex	38 min
Jul 8, 5:27 AM EDT	Small Craft Advisory	PHI		34 hr
Jul 8, 1:49 PM EDT	Severe Thunderstorm Warning	PHI	Hunterdon, Morris, Somerset	41 min
Jul 8, 2:09 PM EDT	Special Marine Warning	PHI		81 min
Jul 8, 2:26 PM EDT	Severe Thunderstorm Warning	PHI	Monmouth, Ocean	21 min
Jul 8, 2:29 PM EDT	Severe Thunderstorm Warning	PHI	Hunterdon, Morris, Somerset, Warren	46 min
Jul 8, 2:43 PM EDT	Rip Current Statement	PHI	Atlantic, Cape May, Monmouth, Ocean	27 hr
Jul 8, 4:02 PM EDT	Special Marine Warning	PHI		33 min
Jul 8, 4:02 PM EDT	Severe Thunderstorm Warning	PHI	Monmouth	31 min
Jul 8, 4:43 PM EDT	Severe Thunderstorm Warning	PHI	Middlesex, Somerset	16 min
Jul 8, 5:29 PM EDT	Special Weather Statement	PHI	Morris, Warren	46 min
Jul 8, 5:34 PM EDT	Severe Thunderstorm Warning	PHI	Hunterdon, Morris, Sussex, Warren	41 min
Jul 8, 6:06 PM EDT	Severe Thunderstorm Warning	PHI	Hunterdon	39 min
Jul 8, 6:09 PM EDT	Severe Thunderstorm Warning	PHI	Hunterdon, Morris, Somerset, Sussex	51 min
Jul 8, 6:16 PM EDT	Severe Thunderstorm Warning	PHI	Hunterdon, Morris, Sussex, Warren	44 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.