Alert archive / New Jersey / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 153, NWS Philadelphia/Mount Holly

July 8, 20214 counties in New Jersey

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Jul 8, 2021, 5:34 PM EDT for 4 counties in New Jersey. It was in force for 41 min. 3 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, 5:34 PM EDT (21:34 UTC)
Expired: Jul 8, 2021, 6:15 PM EDT
In force: 41 min
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

Counties Hunterdon County, NJ, Morris County, NJ, Sussex County, NJ, Warren County, NJ

The radar

The Philadelphia radar (KDIX), 112 km from the middle of the area, began a volume at 21:38 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, 5:50 PM EDT	TSTM WND DMG	1 Ssw Flanders, NJ	TREES DOWN ON WIRES, RESULTING IN POWER OUTAGES NEAR CHESTER TOWNSHIP.
Jul 8, 6:13 PM EDT	TSTM WND DMG	1 Nnw Washington, NJ	DOWNED TREE ON NJ 31 NORTHBOUND NORTH OF NJ 57/WASHINGTON AVE (WASHINGTON TWP) ALL LANES CLOSED. TIME ESTIMATED FROM RADAR.
Jul 8, 6:16 PM EDT	TSTM WND DMG	Tewksbury Twp, NJ	TREES WERE DOWNED IN TEWKSBURY TWP. TIME ESTIMATED FROM RADAR AND DISPATCH REPORTS.

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, 9.6 hours before the alert went out and 144 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.

974 
WUUS51 KPHI 082134
SVRPHI
NJC019-027-037-041-082215-
/O.NEW.KPHI.SV.W.0153.210708T2134Z-210708T2215Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Mount Holly NJ
534 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...
  Morris County in northern New Jersey...
  Southeastern Sussex County in northwestern New Jersey...
  East central Warren County in northwestern New Jersey...

* Until 615 PM EDT.

* At 534 PM EDT, a severe thunderstorm was located over Long Valley,
  or 17 miles northwest of Somerville, moving northeast at 35 mph.

  HAZARD...60 mph wind gusts.

  SOURCE...Radar indicated.

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

* Locations impacted include...
  Newton, Dover, Hopatcong, Kinnelon, Hackettstown, Boonton, Butler,
  Wharton, Washington, Rockaway, Morris Plains, Mount Arlington,
  Franklin, Mendham, Mountain Lakes, Stanhope, Hamburg, Netcong,
  Oxford and Ogdensburg.

This includes Interstate 80 in New Jersey between mile markers 17 and
41.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4112 7446 4109 7450 4107 7449 4104 7450
      4105 7445 4102 7443 4103 7442 4100 7433
      4079 7453 4073 7468 4073 7471 4071 7472
      4066 7484 4078 7505 4120 7458
TIME...MOT...LOC 2134Z 219DEG 30KT 4077 7483 

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

NC

2 follow-up statements

580 
WWUS51 KPHI 082157
SVSPHI

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

NJC019-041-082206-
/O.CAN.KPHI.SV.W.0153.000000T0000Z-210708T2215Z/
Hunterdon NJ-Warren NJ-
557 PM EDT Thu Jul 8 2021

...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN HUNTERDON AND
EAST CENTRAL WARREN 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 900 PM EDT for
northern and northwestern New Jersey.

LAT...LON 4112 7446 4109 7450 4104 7450 4105 7445
      4102 7443 4100 7433 4083 7456 4076 7470
      4088 7481 4091 7477 4098 7483 4120 7458
TIME...MOT...LOC 2156Z 219DEG 30KT 4092 7467 

$$

NJC027-037-082215-
/O.CON.KPHI.SV.W.0153.000000T0000Z-210708T2215Z/
Morris NJ-Sussex NJ-
557 PM EDT Thu Jul 8 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 615 PM EDT
FOR CENTRAL MORRIS AND SOUTHEASTERN SUSSEX COUNTIES...

At 556 PM EDT, a severe thunderstorm was located over Stanhope, or 10
miles southeast of Newton, moving northeast at 35 mph.

HAZARD...60 mph wind gusts.

SOURCE...Radar indicated.

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

Locations impacted include...
Newton, Dover, Hopatcong, Kinnelon, Butler, Wharton, Rockaway, Mount
Arlington, Franklin, Stanhope, Hamburg, Netcong, Ogdensburg, Chester,
Victory Gardens, Andover, Lake Mohawk, Succasunna, Succasunna-Kenvil
and Greendell.

This includes Interstate 80 in New Jersey between mile markers 23 and
39.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4112 7446 4109 7450 4104 7450 4105 7445
      4102 7443 4100 7433 4083 7456 4076 7470
      4088 7481 4091 7477 4098 7483 4120 7458
TIME...MOT...LOC 2156Z 219DEG 30KT 4092 7467 

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

NC

334 
WWUS51 KPHI 082208
SVSPHI

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

NJC027-037-082218-
/O.EXP.KPHI.SV.W.0153.000000T0000Z-210708T2215Z/
Morris NJ-Sussex NJ-
608 PM EDT Thu Jul 8 2021

...THE SEVERE THUNDERSTORM WARNING FOR CENTRAL MORRIS AND
SOUTHEASTERN SUSSEX COUNTIES WILL EXPIRE AT 615 PM EDT...
                
The storm which prompted the warning has weakened below severe
limits, and no longer poses an immediate threat to life or property.
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 900 PM EDT for
northern and northwestern New Jersey.

LAT...LON 4112 7446 4109 7450 4104 7450 4105 7445
      4102 7443 4100 7433 4083 7456 4076 7470
      4088 7481 4091 7477 4098 7483 4120 7458
TIME...MOT...LOC 2208Z 219DEG 30KT 4021 7520 

$$

JEO

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, 3:03 PM EDT	Severe Thunderstorm Warning	PHI	Hunterdon, Middlesex, Morris, Somerset	42 min
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, 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.