Alert archive / New Jersey / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 52, NWS Philadelphia/Mount Holly

June 4, 20216 counties in New Jersey

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Jun 4, 2021, 2:43 PM EDT for 6 counties in New Jersey. It was in force for 62 min. 8 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: Jun 4, 2021, 2:43 PM EDT (18:43 UTC)
Expired: Jun 4, 2021, 3:45 PM EDT
In force: 62 min
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon
Hail: 0.88 in
Wind: 60.0 mph

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

The radar

The Philadelphia radar (KDIX), 101 km from the middle of the area, began a volume at 18:43 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
Jun 4, 2:49 PM EDT	TSTM WND DMG	Lebanon Twp, NJ	DOWNED WIRES IN LEBANON TWP. TIME ESTIMATED FROM RADAR.
Jun 4, 2:50 PM EDT	TSTM WND DMG	1 Nnw Califon, NJ	DOWNED WIRES NEAR HIGH BRIDGE-CALIFON ROAD. TIME ESTIMATED FROM RADAR.
Jun 4, 2:55 PM EDT	TSTM WND DMG	2 Sse Bethlehem Twp, NJ	DOWNED WIRES NEAR PATTENBURG ROAD. TIME ESTIMATED FROM RADAR.
Jun 4, 2:57 PM EDT	TSTM WND DMG	1 E Milton, NJ	LARGE TREE AND WIRES DOWN ON A HOUSE ON DOVER MILTON RD. FIRE DEPARTMENT REPORT RELAYED BY AN AMATEUR RADIO OPERATOR. TIME ESTIMATED FROM RADAR.
Jun 4, 2:57 PM EDT	TSTM WND DMG	3 Nw Franklin Twp, NJ	DOWNED WIRES IN UNION TWP. TIME ESTIMATED FROM RADAR.
Jun 4, 3:03 PM EDT	TSTM WND DMG	1 S Pottersville, NJ	DOWNED TREES AND WIRES NEAR MCCAN MILL ROAD. TIME ESTIMATED FROM RADAR.
Jun 4, 3:30 PM EDT	TSTM WND DMG	Long Hill Twp, NJ	LARGE TREE DOWN.
Jun 4, 3:33 PM EDT	TSTM WND DMG	1 Ese New Vernon, NJ	DOWNED TREES AND WIRES NEAR VILLAGE 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, 6.7 hours before the alert went out and 133 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: 233 J/kg
Mixed-layer CIN: -50 J/kg
Mixed-layer LCL: 526 m above ground
0-6 km bulk shear: 38 kt
0-1 km storm-relative helicity: 30 m²/s²
0-3 km storm-relative helicity: 95 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

226 
WUUS51 KPHI 041843
SVRPHI
NJC019-023-027-035-037-041-041945-
/O.NEW.KPHI.SV.W.0052.210604T1843Z-210604T1945Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Mount Holly NJ
243 PM EDT Fri Jun 4 2021

The National Weather Service in Mount Holly NJ has issued a

* Severe Thunderstorm Warning for...
  Northern Hunterdon County in northwestern New Jersey...
  Morris County in northern New Jersey...
  Southeastern Sussex County in northwestern New Jersey...
  Central Warren County in northwestern New Jersey...
  Northern Somerset County in northern New Jersey...
  North central Middlesex County in northern New Jersey...

* Until 345 PM EDT.

* At 243 PM EDT, severe thunderstorms were located along a line
  extending from Ogdensburg to near Pleasant Valley, moving southeast
  at 30 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...
  Morristown, Newton, Bridgewater, Dover, Madison, Hopatcong,
  Middlesex, Florham Park, East Hanover, Lincoln Park, Bound Brook,
  Kinnelon, Hackettstown, Chatham, Boonton, Butler, Wharton,
  Washington, Rockaway and Morris Plains.

People at the Morris County Mega Site should seek safe shelter
immediately!

This includes the following highways...
 Interstate 78 in New Jersey between mile markers 6 and 42.
 Interstate 80 in New Jersey between mile markers 18 and 49.
 Interstate 287 in New Jersey between mile markers 15 and 54.

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 these storms. Move indoors
immediately. Remember, if you can hear thunder, you are close enough
to be struck by lightning.

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

&&

LAT...LON 4111 7447 4104 7450 4105 7445 4103 7442
      4100 7430 4097 7428 4090 7427 4091 7434
      4086 7432 4076 7437 4075 7436 4067 7446
      4066 7445 4066 7440 4060 7446 4060 7440
      4057 7444 4062 7515 4115 7465
TIME...MOT...LOC 1843Z 293DEG 27KT 4108 7456 4071 7503 

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

Davis

4 follow-up statements

736 
WWUS51 KPHI 041855
SVSPHI

Severe Weather Statement
National Weather Service Mount Holly NJ
255 PM EDT Fri Jun 4 2021

NJC019-023-027-035-037-041-041945-
/O.CON.KPHI.SV.W.0052.000000T0000Z-210604T1945Z/
Hunterdon NJ-Morris NJ-Sussex NJ-Warren NJ-Somerset NJ-Middlesex NJ-
255 PM EDT Fri Jun 4 2021

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

At 254 PM EDT, severe thunderstorms were located along a line
extending from near Green Pond to High Bridge, moving southeast at 30
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...
Morristown, Bridgewater, Dover, Madison, Hopatcong, Middlesex,
Florham Park, East Hanover, Lincoln Park, Bound Brook, Kinnelon,
Hackettstown, Chatham, Boonton, Butler, Wharton, Rockaway, Morris
Plains, Mount Arlington and Franklin.

People at the Morris County Mega Site should seek safe shelter
immediately!

This includes the following highways...
 Interstate 78 in New Jersey between mile markers 9 and 42.
 Interstate 80 in New Jersey between mile markers 22 and 49.
 Interstate 287 in New Jersey between mile markers 17 and 54.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

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

&&

LAT...LON 4111 7447 4104 7450 4105 7445 4103 7442
      4100 7430 4097 7428 4090 7427 4091 7434
      4086 7432 4076 7437 4075 7436 4067 7446
      4066 7445 4066 7440 4060 7446 4060 7440
      4057 7444 4062 7509 4113 7457
TIME...MOT...LOC 1854Z 293DEG 27KT 4105 7446 4068 7493 

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

Davis

811 
WWUS51 KPHI 041906
SVSPHI

Severe Weather Statement
National Weather Service Mount Holly NJ
306 PM EDT Fri Jun 4 2021

NJC037-041-041915-
/O.CAN.KPHI.SV.W.0052.000000T0000Z-210604T1945Z/
Sussex NJ-Warren NJ-
306 PM EDT Fri Jun 4 2021

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN SUSSEX AND
SOUTHEASTERN WARREN COUNTIES 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 800 PM EDT for
northern and northwestern New Jersey.

LAT...LON 4090 7427 4091 7434 4086 7432 4079 7437
      4075 7436 4067 7446 4066 7445 4066 7440
      4060 7446 4060 7440 4057 7444 4062 7494
      4109 7450 4104 7450 4105 7445 4102 7443
      4100 7430
TIME...MOT...LOC 1905Z 293DEG 27KT 4102 7437 4065 7484 

$$

NJC019-023-027-035-041945-
/O.CON.KPHI.SV.W.0052.000000T0000Z-210604T1945Z/
Hunterdon NJ-Morris NJ-Somerset NJ-Middlesex NJ-
306 PM EDT Fri Jun 4 2021

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

At 305 PM EDT, severe thunderstorms were located along a line
extending from Bloomingdale to Lebanon, moving southeast at 30 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, Bridgewater, Dover, Madison, Hopatcong, Middlesex,
Florham Park, East Hanover, Lincoln Park, Bound Brook, Kinnelon,
Chatham, Boonton, Butler, Wharton, Rockaway, Morris Plains, Mount
Arlington, Mendham and Mountain Lakes.

People at the Morris County Mega Site should seek safe shelter
immediately!

This includes the following highways...
 Interstate 78 in New Jersey between mile markers 16 and 42.
 Interstate 80 in New Jersey between mile markers 28 and 49.
 Interstate 287 in New Jersey between mile markers 18 and 54.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

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

&&

LAT...LON 4090 7427 4091 7434 4086 7432 4079 7437
      4075 7436 4067 7446 4066 7445 4066 7440
      4060 7446 4060 7440 4057 7444 4062 7494
      4109 7450 4104 7450 4105 7445 4102 7443
      4100 7430
TIME...MOT...LOC 1905Z 293DEG 27KT 4102 7437 4065 7484 

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

Davis

189 
WWUS51 KPHI 041919
SVSPHI

Severe Weather Statement
National Weather Service Mount Holly NJ
319 PM EDT Fri Jun 4 2021

NJC019-023-027-035-041945-
/O.CON.KPHI.SV.W.0052.000000T0000Z-210604T1945Z/
Hunterdon NJ-Morris NJ-Somerset NJ-Middlesex NJ-
319 PM EDT Fri Jun 4 2021

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

At 319 PM EDT, severe thunderstorms were located along a line
extending from near Wayne to near White House Station, moving
southeast at 30 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, Bridgewater, Madison, Middlesex, Florham Park, East
Hanover, Lincoln Park, Bound Brook, Kinnelon, Chatham, Boonton,
Morris Plains, Mendham, Mountain Lakes, Riverdale, Peapack And
Gladstone, Far Hills, Martinsville, Millington and Parsippany.

This includes the following highways...
 Interstate 78 in New Jersey between mile markers 27 and 42.
 Interstate 80 in New Jersey between mile markers 40 and 49.
 Interstate 287 in New Jersey between mile markers 17 and 53.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

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

&&

LAT...LON 4090 7427 4091 7434 4086 7432 4079 7437
      4075 7436 4067 7446 4066 7445 4066 7440
      4060 7446 4060 7440 4057 7444 4060 7478
      4099 7438 4100 7430
TIME...MOT...LOC 1919Z 293DEG 27KT 4098 7424 4061 7471 

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

Davis

044 
WWUS51 KPHI 041936
SVSPHI

Severe Weather Statement
National Weather Service Mount Holly NJ
336 PM EDT Fri Jun 4 2021

NJC019-023-027-035-041945-
/O.EXP.KPHI.SV.W.0052.000000T0000Z-210604T1945Z/
Hunterdon NJ-Morris NJ-Somerset NJ-Middlesex NJ-
336 PM EDT Fri Jun 4 2021

...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN HUNTERDON...
SOUTHEASTERN MORRIS...NORTHERN SOMERSET AND NORTH CENTRAL MIDDLESEX
COUNTIES WILL EXPIRE AT 345 PM EDT...
    
The storms which prompted the warning have moved out of the area.
Therefore, the warning will be allowed to expire. However, gusty 
winds and heavy rain are still possible with these thunderstorms.

A Severe Thunderstorm Watch remains in effect until 800 PM EDT for
northern and northwestern New Jersey.

LAT...LON 4090 7427 4091 7434 4086 7432 4079 7437
      4075 7436 4067 7446 4066 7445 4066 7440
      4060 7446 4060 7440 4057 7444 4060 7478
      4099 7438 4100 7430
TIME...MOT...LOC 1935Z 293DEG 27KT 4093 7409 4056 7456 

$$

Davis

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 3, 8:14 PM EDT	Severe Thunderstorm Warning	PHI	Middlesex, Monmouth, Ocean	19 min
Jun 3, 8:44 PM EDT	Severe Thunderstorm Warning	PHI	Burlington, Mercer, Middlesex, Monmouth	30 min
Jun 3, 8:55 PM EDT	Severe Thunderstorm Warning	PHI	Middlesex, Monmouth	10 min
Jun 4, 1:07 PM EDT	Special Weather Statement	PHI	Sussex	38 min
Jun 4, 1:45 PM EDT	Areal Flood Advisory	PHI	Warren	97 min
Jun 4, 1:49 PM EDT	Severe Thunderstorm Warning	PHI	Sussex, Warren	41 min
Jun 4, 2:49 PM EDT	Areal Flood Advisory	PHI	Hunterdon, Middlesex, Morris, Somerset, Sussex, Warren	70 min
Jun 4, 3:16 PM EDT	Areal Flood Advisory	PHI	Burlington, Camden, Hunterdon, Mercer, Middlesex, Monmouth and 1 more	98 min
Jun 4, 3:18 PM EDT	Severe Thunderstorm Warning	PHI	Burlington, Mercer	42 min
Jun 4, 3:23 PM EDT	Severe Thunderstorm Warning	PHI	Hunterdon, Mercer, Middlesex, Somerset	67 min
Jun 4, 3:46 PM EDT	Severe Thunderstorm Warning	PHI	Burlington, Camden, Mercer	44 min
Jun 4, 4:12 PM EDT	Severe Thunderstorm Warning	PHI	Burlington, Mercer, Middlesex, Monmouth, Ocean	63 min
Jun 4, 4:20 PM EDT	Severe Thunderstorm Warning	PHI	Burlington, Camden, Gloucester	40 min
Jun 4, 4:22 PM EDT	Special Marine Warning	PHI		53 min
Jun 4, 4:23 PM EDT	Severe Thunderstorm Warning	PHI	Burlington, Ocean	52 min
Jun 4, 4:30 PM EDT	Areal Flood Advisory	PHI	Middlesex, Monmouth, Ocean	63 min
Jun 4, 5:09 PM EDT	Special Marine Warning	PHI		2 hr
Jun 4, 5:12 PM EDT	Severe Thunderstorm Warning	PHI	Ocean	18 min
Jun 4, 5:32 PM EDT	Special Marine Warning	PHI		58 min
Jun 4, 6:18 PM EDT	Special Weather Statement	PHI	Atlantic	42 min
Jun 4, 6:27 PM EDT	Severe Thunderstorm Warning	PHI	Atlantic, Cape May, Cumberland	48 min
Jun 4, 7:13 PM EDT	Special Marine Warning	PHI		62 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.