Alert archive / New Jersey / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 131, NWS Philadelphia/Mount Holly

July 6, 20215 counties in New Jersey; Bucks County, Pennsylvania

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Jul 6, 2021, 6:41 PM EDT for 5 counties in New Jersey; Bucks County, Pennsylvania. It was in force for 64 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued: Jul 6, 2021, 6:41 PM EDT (22:41 UTC)
Expired: Jul 6, 2021, 7:45 PM EDT
In force: 64 min
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

Counties Hunterdon County, NJ, Mercer County, NJ, Middlesex County, NJ, Monmouth County, NJ, Somerset County, NJ, Bucks County, PA

The radar

The Philadelphia radar (KDIX), 74 km from the middle of the area, began a volume at 22:41 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.

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, 10.7 hours before the alert went out and 177 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.

391 
WUUS51 KPHI 062241
SVRPHI
NJC019-021-023-025-035-PAC017-062345-
/O.NEW.KPHI.SV.W.0131.210706T2241Z-210706T2345Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Mount Holly NJ
641 PM EDT Tue Jul 6 2021

The National Weather Service in Mount Holly NJ has issued a

* Severe Thunderstorm Warning for...
  Hunterdon County in northwestern New Jersey...
  Mercer County in central New Jersey...
  Southwestern Somerset County in northern New Jersey...
  West central Monmouth County in central New Jersey...
  Southwestern Middlesex County in northern New Jersey...
  Central Bucks County in southeastern Pennsylvania...

* Until 745 PM EDT.

* At 641 PM EDT, severe thunderstorms were located along a line
  extending from near Bridgewater to Riegelsville, moving east at 40
  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...
  Trenton, South Brunswick, Manalapan, Ewing, Princeton, Byram,
  Hightstown, Flemington, Tinicum, Cranbury, High Bridge, Clinton,
  Pennington, New Hope, Yardley, Hopewell, Glen Gardner, Frenchtown,
  Lebanon and Milford.

This includes the following highways...
 New Jersey Turnpike between exits 8A and 9.
 Interstate 78 in New Jersey between mile markers 7 and 22.
 Interstate 295 in New Jersey between mile markers 65 and 76.

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 4020 7428 4026 7499 4060 7521 4061 7520
      4059 7518 4063 7515 4069 7503 4069 7486
TIME...MOT...LOC 2241Z 290DEG 33KT 4059 7471 4060 7521 

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

Staarmann

2 follow-up statements

877 
WWUS51 KPHI 062317
SVSPHI

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

NJC019-021-023-025-035-PAC017-062345-
/O.CON.KPHI.SV.W.0131.000000T0000Z-210706T2345Z/
Hunterdon NJ-Mercer NJ-Somerset NJ-Monmouth NJ-Middlesex NJ-Bucks PA-
717 PM EDT Tue Jul 6 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 745 PM EDT
FOR SOUTHEASTERN HUNTERDON...MERCER...SOUTHWESTERN SOMERSET...WEST
CENTRAL MONMOUTH...SOUTHWESTERN MIDDLESEX AND EAST CENTRAL BUCKS
COUNTIES...

At 717 PM EDT, severe thunderstorms were located along a line
extending from South Brunswick to Skillman to Sand Brook, moving
southeast 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...
Trenton, South Brunswick, Manalapan, Ewing, Princeton, Hightstown,
Flemington, Cranbury, Pennington, New Hope, Yardley, Hopewell,
Frenchtown, Roosevelt, Rocky Hill, Stockton, Washington Crossing,
Skillman, Flagtown and Princeton Meadows.

This includes the following highways...
 New Jersey Turnpike between exits 8A and 9.
 Interstate 295 in New Jersey between mile markers 65 and 76.

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 4020 7428 4026 7499 4055 7507 4062 7478
TIME...MOT...LOC 2317Z 298DEG 41KT 4042 7452 4040 7469 4047 7494 

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

Staarmann

083 
WWUS51 KPHI 062328
SVSPHI

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

NJC019-021-023-025-035-PAC017-062345-
/O.CON.KPHI.SV.W.0131.000000T0000Z-210706T2345Z/
Hunterdon NJ-Mercer NJ-Somerset NJ-Monmouth NJ-Middlesex NJ-Bucks PA-
728 PM EDT Tue Jul 6 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 745 PM EDT
FOR SOUTHEASTERN HUNTERDON...MERCER...SOUTHWESTERN SOMERSET...WEST
CENTRAL MONMOUTH...SOUTHWESTERN MIDDLESEX AND EAST CENTRAL BUCKS
COUNTIES...

At 728 PM EDT, severe thunderstorms were located along a line
extending from South Brunswick to Rocky Hill to Sand Brook, moving
east at 35 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...
Trenton, South Brunswick, Manalapan, Ewing, Princeton, Hightstown,
Flemington, Cranbury, Pennington, New Hope, Yardley, Hopewell,
Roosevelt, Rocky Hill, Washington Crossing, Skillman, Flagtown,
Princeton Meadows, Windsor and Kingston.

This includes the following highways...
 New Jersey Turnpike between exits 8A and 9.
 Interstate 295 in New Jersey between mile markers 65 and 76.

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 4020 7428 4026 7499 4056 7494 4058 7473
TIME...MOT...LOC 2328Z 289DEG 32KT 4042 7453 4038 7466 4048 7489 

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, 5:46 PM EDT	Severe Thunderstorm Warning	PHI	Hunterdon, Morris, Somerset, Sussex, Warren	59 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, 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
Jul 6, 4:23 PM EDT	Severe Thunderstorm Warning	PHI	Berks, Chester, Montgomery	52 min
Jul 6, 4:29 PM EDT	Severe Thunderstorm Warning	PHI	Carbon, Monroe	76 min
Jul 6, 5:08 PM EDT	Special Weather Statement	PHI	Carbon	37 min
Jul 6, 5:34 PM EDT	Severe Thunderstorm Warning	PHI	Chester, Delaware, Montgomery, Philadelphia	41 min
Jul 6, 7:50 PM EDT	Special Weather Statement	PHI	Lehigh	25 min

Nearby

Severe Thunderstorm Warnings in New Jersey, 2021 Severe Thunderstorm Warnings in Pennsylvania, 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.