Alert archive / New Jersey / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 127, NWS Philadelphia/Mount Holly

July 6, 20215 counties in New Jersey

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Jul 6, 2021, 5:46 PM EDT for 5 counties in New Jersey. It was in force for 59 min. 10 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 6, 2021, 5:46 PM EDT (21:46 UTC)
Expired: Jul 6, 2021, 6:45 PM EDT
In force: 59 min
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon
Hail: 1.0 in
Wind: 70.0 mph

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

The radar

The Philadelphia radar (KDIX), 110 km from the middle of the area, began a volume at 21:46 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 6, 5:46 PM EDT	TSTM WND DMG	1 Wsw Hardyston Twp, NJ	PHOTO OF LARGE LIMB DOWN ON POWER LINES ON SOCIAL MEDIA. TIME ESTIMATED FROM RADAR.
Jul 6, 5:50 PM EDT	TSTM WND DMG	Jefferson Twp, NJ	PHOTO OF BRANCH DOWN IN YARD ON SOCIAL MEDIA. TIME ESTIMATED FROM RADAR.
Jul 6, 5:50 PM EDT	TSTM WND DMG	Jefferson Twp, NJ	TREES AND WIRES DOWN. NORTH BEACH ROAD CLOSED DUE TO DOWNED UTILITY POLE. BRADY ROAD FROM NORTH CHERRY TO ESPANONG ROAD CLOSED DUE TO DOWN TREE / LINES. TIME ESTIMATED FROM RADAR.
Jul 6, 5:55 PM EDT	TSTM WND DMG	Highland Lakes, NJ	SEVERAL BRANCHES AND LIMBS DOWN. TIME ESTIMATED FROM RADAR.
Jul 6, 6:00 PM EDT	TSTM WND DMG	Rockaway, NJ	MULTIPLE TREES DOWN, CORRECTED TO INDICATE DAMAGE WAS FROM THUNDERSTORM.
Jul 6, 6:06 PM EDT	TSTM WND DMG	Pompton Plains, NJ	LARGE TREE BRANCH BROUGHT DOWN POWER LINES IN ROADWAY. TIME ESTIMATED FROM RADAR. REPORT VIA SOCIAL MEDIA.
Jul 6, 6:10 PM EDT	TSTM WND DMG	Boonton, NJ	TREE LIMB DOWN ON I-287 SOUTHBOUND NEAR BOONTON. REPORT VIA SOCIAL MEDIA. TIME ESTIMATED FROM RADAR.
Jul 6, 6:10 PM EDT	NON-TSTM WND DMG	Boonton, NJ	TREE LIMB DOWN ON I-287 SOUTHBOUND NEAR BOONTON. REPORT VIA SOCIAL MEDIA. TIME ESTIMATED FROM RADAR.
Jul 6, 6:18 PM EDT	TSTM WND DMG	1 Nne Basking Ridge, NJ	REPORT FROM MPING: TREES UPROOTED OR SNAPPED; ROOF BLOWN OFF. TIME CORRECTED BASED ON RADAR.
Jul 6, 6:22 PM EDT	TSTM WND DMG	2 Nne Basking Ridge, NJ	MPING REPORT OF TREES DOWN.

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 6, 1:32 PM EDT	Severe Thunderstorm Watch	SPC	8 hr

The nearest sounding before it

Brookhaven, NY (KOKX), launched 12:00Z, 9.8 hours before the alert went out and 139 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: 230 J/kg
Mixed-layer CIN: -195 J/kg
Mixed-layer LCL: 1202 m above ground
0-6 km bulk shear: 19 kt
0-1 km storm-relative helicity: 139 m²/s²
0-3 km storm-relative helicity: 184 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

201 
WUUS51 KPHI 062146
SVRPHI
NJC019-027-035-037-041-062245-
/O.NEW.KPHI.SV.W.0127.210706T2146Z-210706T2245Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Mount Holly NJ
546 PM EDT Tue Jul 6 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...
  Eastern Sussex County in northwestern New Jersey...
  East central Warren County in northwestern New Jersey...
  Northern Somerset County in northern New Jersey...

* Until 645 PM EDT.

* At 546 PM EDT, severe thunderstorms were located along a line
  extending from near Sussex to near Lake Telemark to Budd Lake to
  near Hope, moving east at 45 mph.

  HAZARD...70 mph wind gusts and quarter size hail.

  SOURCE...Radar indicated.

  IMPACT...Minor damage to vehicles is possible. Expect considerable 
           tree damage. Wind damage is also likely to mobile homes, 
           roofs, and outbuildings.

* Locations impacted include...
  Morristown, Dover, Madison, Hopatcong, Florham Park, East Hanover,
  Lincoln Park, Bound Brook, Kinnelon, Hackettstown, Chatham,
  Boonton, Butler, Wharton, Rockaway, Morris Plains, Mount Arlington,
  Franklin, Mendham and Mountain Lakes.

This includes the following highways...
 Interstate 78 in New Jersey between mile markers 26 and 42.
 Interstate 80 in New Jersey between mile markers 7 and 47.
 Interstate 287 in New Jersey between mile markers 19 and 54.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Prepare immediately for large hail and damaging winds. People outside
should move immediately to shelter inside a strong building. Stay
away from windows.

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

&&

LAT...LON 4127 7450 4120 7436 4110 7449 4104 7450
      4105 7445 4102 7443 4100 7430 4090 7427
      4091 7434 4075 7436 4067 7446 4066 7445
      4066 7440 4063 7442 4057 7455 4066 7477
      4092 7508 4097 7495 4100 7465 4128 7460
TIME...MOT...LOC 2146Z 283DEG 40KT 4121 7455 4100 7457 4085 7475 4087
7499

HAIL...1.00IN
WIND...70MPH
 
$$

Staarmann

2 follow-up statements

602 
WWUS51 KPHI 062202
SVSPHI

Severe Weather Statement
National Weather Service Mount Holly NJ
602 PM EDT Tue Jul 6 2021

NJC019-027-035-037-041-062245-
/O.CON.KPHI.SV.W.0127.000000T0000Z-210706T2245Z/
Hunterdon NJ-Morris NJ-Sussex NJ-Warren NJ-Somerset NJ-
602 PM EDT Tue Jul 6 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 645 PM EDT
FOR NORTHEASTERN HUNTERDON...MORRIS...EASTERN SUSSEX...EAST CENTRAL
WARREN AND NORTHERN SOMERSET COUNTIES...

At 601 PM EDT, severe thunderstorms were located along a line
extending from Upper Greenwood Lake to Kinnelon to near Morristown 
to Long Valley, moving east at 45 mph. This line of storms has a 
history of producing wind damage in East Stroudsburg, Pennsylvania.

HAZARD...70 mph wind gusts and quarter size hail.

SOURCE...Public.

IMPACT...Minor damage to vehicles is possible. Expect considerable 
         tree damage. Wind damage is also likely to mobile homes, 
         roofs, and outbuildings.

Locations impacted include...
Morristown, Dover, Madison, Hopatcong, Florham Park, East Hanover,
Lincoln Park, Bound Brook, Kinnelon, Hackettstown, Chatham, Boonton,
Butler, Wharton, Rockaway, Morris Plains, Mount Arlington, Mendham,
Mountain Lakes and Stanhope.

This includes the following highways...
 Interstate 78 in New Jersey between mile markers 26 and 42.
 Interstate 80 in New Jersey between mile markers 11 and 47.
 Interstate 287 in New Jersey between mile markers 19 and 54.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Prepare immediately for large hail and damaging winds. People outside
should seek shelter inside a well-built structure and away from
windows.

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

&&

LAT...LON 4127 7450 4120 7436 4110 7449 4104 7450
      4105 7445 4102 7443 4100 7430 4090 7427
      4091 7434 4075 7436 4067 7446 4066 7445
      4066 7440 4063 7442 4057 7455 4066 7477
      4092 7508 4095 7478 4100 7460
TIME...MOT...LOC 2201Z 282DEG 41KT 4118 7437 4097 7439 4081 7453 4077
7481

HAIL...1.00IN
WIND...70MPH
 
$$

Staarmann

875 
WWUS51 KPHI 062220
SVSPHI

Severe Weather Statement
National Weather Service Mount Holly NJ
620 PM EDT Tue Jul 6 2021

NJC037-062229-
/O.CAN.KPHI.SV.W.0127.000000T0000Z-210706T2245Z/
Sussex NJ-
620 PM EDT Tue Jul 6 2021

...THE SEVERE THUNDERSTORM WARNING FOR EASTERN SUSSEX 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 1000 PM EDT for
northern and northwestern New Jersey.

LAT...LON 4085 7500 4083 7463 4100 7430 4090 7427
      4091 7434 4075 7436 4067 7446 4066 7445
      4066 7440 4063 7442 4057 7455 4066 7477
TIME...MOT...LOC 2219Z 293DEG 36KT 4087 7428 4067 7452 4069 7476 

$$

NJC019-027-035-041-062245-
/O.CON.KPHI.SV.W.0127.000000T0000Z-210706T2245Z/
Hunterdon NJ-Morris NJ-Warren NJ-Somerset NJ-
620 PM EDT Tue Jul 6 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 645 PM EDT
FOR NORTHEASTERN HUNTERDON...SOUTHERN MORRIS...EAST CENTRAL WARREN
AND NORTHERN SOMERSET COUNTIES...

At 619 PM EDT, severe thunderstorms were located along a line
extending from Fairfield to Millington to near Califon, moving
southeast at 40 mph.

HAZARD...70 mph wind gusts and quarter size hail.

SOURCE...Public.

IMPACT...Minor damage to vehicles is possible. Expect considerable 
         tree damage. Wind damage is also likely to mobile homes, 
         roofs, and outbuildings.

Locations impacted include...
Morristown, Madison, Florham Park, East Hanover, Lincoln Park, Bound
Brook, Hackettstown, Chatham, Boonton, Rockaway, Morris Plains,
Mendham, Mountain Lakes, Riverdale, Peapack And Gladstone, Oxford,
Chester, Victory Gardens, Califon and Far Hills.

This includes the following highways...
 Interstate 78 in New Jersey between mile markers 26 and 42.
 Interstate 80 in New Jersey between mile markers 39 and 47.
 Interstate 287 in New Jersey between mile markers 19 and 53.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Prepare immediately for large hail and damaging winds. People outside
should seek shelter inside a well-built structure and away from
windows.

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

&&

LAT...LON 4085 7500 4083 7463 4100 7430 4090 7427
      4091 7434 4075 7436 4067 7446 4066 7445
      4066 7440 4063 7442 4057 7455 4066 7477
TIME...MOT...LOC 2219Z 293DEG 36KT 4087 7428 4067 7452 4069 7476 

HAIL...1.00IN
WIND...70MPH
 
$$

Staarmann

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 6, 3:53 AM EDT	Small Craft Advisory	PHI		22 hr
Jul 6, 5:11 PM EDT	Severe Thunderstorm Warning	PHI	Burlington	49 min
Jul 6, 5:15 PM EDT	Severe Thunderstorm Warning	PHI	Morris, Sussex, Warren	60 min
Jul 6, 5:55 PM EDT	Severe Thunderstorm Warning	PHI	Hunterdon, Somerset, Warren	65 min
Jul 6, 6:13 PM EDT	Severe Thunderstorm Warning	PHI	Burlington, Camden	31 min
Jul 6, 6:17 PM EDT	Severe Thunderstorm Warning	PHI	Hunterdon, Middlesex, Monmouth, Somerset	58 min
Jul 6, 6:33 PM EDT	Special Marine Warning	PHI		117 min
Jul 6, 6:41 PM EDT	Severe Thunderstorm Warning	PHI	Hunterdon, Mercer, Middlesex, Monmouth, Somerset	64 min
Jul 6, 7:01 PM EDT	Severe Thunderstorm Warning	PHI	Burlington, Hunterdon, Mercer, Middlesex, Monmouth, Ocean and 1 more	59 min
Jul 6, 7:59 PM EDT	Severe Thunderstorm Warning	PHI	Mercer, Middlesex, Monmouth, Ocean, Somerset	61 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.