Alert archive / New Jersey / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 139, 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, 9:48 PM EDT for 5 counties in New Jersey; Bucks County, Pennsylvania. It was in force for 57 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, 9:48 PM EDT (01:48 UTC)
Expired
Jul 6, 2021, 10:45 PM EDT
In force
57 min
Issued by
NWS Philadelphia/Mount Holly
Area
Storm-based polygon
Hail
1.25 in
Wind
60.0 mph

Counties Burlington County, NJ, Mercer County, NJ, Middlesex County, NJ, Monmouth County, NJ, Ocean County, NJ, Bucks County, PA

The radar

The Philadelphia radar (KDIX), 23 km from the middle of the area, began a volume at 01:49 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.

IssuedProductOfficeLasted
Jul 6, 1:32 PM EDTSevere Thunderstorm WatchSPC8 hr

The nearest sounding before it

Brookhaven, NY (KOKX), launched 00:00Z, 1.8 hours before the alert went out and 156 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-pSkew-T log-p diagram, Brookhaven, NY at 00:00Z on 2021-07-07Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1647 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Brookhaven, NY at 00:00Z on 2021-07-07The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 85 square meters per square second.193958Sfc1 km3 km6 km9 kmRMLM
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
1647 J/kg
Mixed-layer CIN
-86 J/kg
Mixed-layer LCL
876 m above ground
0-6 km bulk shear
25 kt
0-1 km storm-relative helicity
85 m²/s²
0-3 km storm-relative helicity
93 m²/s²
Significant tornado parameter
0.3
Supercell composite
3.3

Open this sounding in Storm Lab

The text

As transmitted.

570 
WUUS51 KPHI 070148
SVRPHI
NJC005-021-023-025-029-PAC017-070245-
/O.NEW.KPHI.SV.W.0139.210707T0148Z-210707T0245Z/

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

The National Weather Service in Mount Holly NJ has issued a

* Severe Thunderstorm Warning for...
  Northern Ocean County in southern New Jersey...
  Southern Mercer County in central New Jersey...
  Northeastern Burlington County in southern New Jersey...
  Southern Monmouth County in central New Jersey...
  South central Middlesex County in northern New Jersey...
  Southeastern Bucks County in southeastern Pennsylvania...

* Until 1045 PM EDT.

* At 948 PM EDT, severe thunderstorms were located along a line
  extending from Cranbury to Edinburg to Ewing, moving southeast at
  30 mph.

  HAZARD...60 mph wind gusts and half dollar 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...
  Toms River, Trenton, Lakewood, Jackson, Howell, Manalapan, Ewing,
  Florence, Burlington, Bristol, Manasquan, Hightstown, Point
  Pleasant Beach, Bordentown, Cranbury, Lakehurst, Yardley, Newtown,
  Tullytown and Allentown.

This includes the following highways...
 New Jersey Turnpike between exits 6 and 8A.
 Pennsylvania Turnpike between mile markers 353 and 359.
 Interstate 95 in Pennsylvania between mile markers 38 and 40.
 Interstate 195 in New Jersey between mile markers 0 and 33.
 Interstate 295 in New Jersey between mile markers 49 and 67, and
between mile markers 73 and 76.
 Garden State Parkway between mile markers 83 and 97.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

These storms are producing large hail. SEEK SHELTER NOW inside a
sturdy structure and stay away from windows!

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 4013 7402 3997 7405 3996 7434 4007 7491
      4033 7509 4028 7472 4032 7448
TIME...MOT...LOC 0148Z 296DEG 27KT 4031 7451 4024 7462 4028 7478 

HAIL...1.25IN
WIND...60MPH
 
$$

Staarmann
1 follow-up statement
569 
WWUS51 KPHI 070217
SVSPHI

Severe Weather Statement
National Weather Service Mount Holly NJ
1017 PM EDT Tue Jul 6 2021

NJC005-021-023-025-029-PAC017-070245-
/O.CON.KPHI.SV.W.0139.000000T0000Z-210707T0245Z/
Ocean NJ-Mercer NJ-Burlington NJ-Monmouth NJ-Middlesex NJ-Bucks PA-
1017 PM EDT Tue Jul 6 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1045 PM EDT
FOR NORTHERN OCEAN...SOUTHERN MERCER...NORTHEASTERN BURLINGTON...
SOUTHERN MONMOUTH...SOUTH CENTRAL MIDDLESEX AND EAST CENTRAL BUCKS
COUNTIES...

At 1017 PM EDT, severe thunderstorms were located along a line
extending from near Allenwood to near Jacksons Mills to Columbus,
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...
Toms River, Trenton, Lakewood, Jackson, Howell, Manalapan, Ewing,
Florence, Manasquan, Hightstown, Point Pleasant Beach, Bordentown,
Cranbury, Lakehurst, Yardley, Tullytown, Allentown, Farmingdale,
Roosevelt and Wrightstown.

This includes the following highways...
 New Jersey Turnpike between exits 6 and 8A.
 Interstate 195 in New Jersey between mile markers 0 and 33.
 Interstate 295 in New Jersey between mile markers 50 and 67, and
between mile markers 73 and 76.
 Garden State Parkway between mile markers 83 and 97.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

These storms are producing large hail. SEEK SHELTER NOW inside a
sturdy structure and stay away from windows.

Frequent cloud to ground lightning is occurring with these storms.
Move indoors immediately. Lightning is one of nature's leading
killers. 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 3997 7405 3996 7434 4005 7481 4030 7486
      4028 7472 4032 7448 4013 7402
TIME...MOT...LOC 0217Z 295DEG 28KT 4017 7413 4012 7435 4008 7470 

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

Staarmann

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 6, 8:03 PM EDTSpecial Weather StatementPHIBurlington, Ocean42 min
Jul 6, 8:11 PM EDTSpecial Marine WarningPHI82 min
Jul 6, 8:24 PM EDTSpecial Marine WarningPHI2 hr
Jul 6, 8:29 PM EDTSevere Thunderstorm WarningPHIHunterdon, Warren46 min
Jul 6, 8:37 PM EDTSevere Thunderstorm WarningPHIHunterdon, Middlesex, Monmouth, Morris, Somerset53 min
Jul 6, 8:50 PM EDTSevere Thunderstorm WarningPHIHunterdon, Mercer, Middlesex, Monmouth, Somerset40 min
Jul 6, 9:04 PM EDTSevere Thunderstorm WarningPHIHunterdon, Mercer, Middlesex, Somerset41 min
Jul 6, 9:10 PM EDTAreal Flood AdvisoryPHIHunterdon, Mercer, Middlesex, Monmouth, Morris, Somerset and 1 more2 hr
Jul 6, 9:29 PM EDTSevere Thunderstorm WarningPHIHunterdon, Mercer, Middlesex, Monmouth, Morris, Somerset61 min
Jul 6, 9:37 PM EDTSpecial Marine WarningPHI113 min
Jul 6, 10:21 PM EDTSevere Thunderstorm WarningPHIBurlington, Camden39 min
Jul 6, 10:50 PM EDTAreal Flood AdvisoryPHIMonmouth, Ocean2 hr
Jul 6, 10:54 PM EDTSpecial Weather StatementPHIBurlington51 min
Jul 6, 11:11 PM EDTSpecial Weather StatementPHIBurlington19 min
Jul 6, 11:30 PM EDTSevere Thunderstorm WarningPHIAtlantic, Burlington, Camden, Ocean45 min
Jul 6, 11:39 PM EDTSpecial Marine WarningPHI66 min
Jul 6, 11:55 PM EDTSpecial Weather StatementPHIMonmouth50 min
Jul 7, 12:01 AM EDTAreal Flood AdvisoryPHIMiddlesex, Monmouth71 min
Jul 7, 12:10 AM EDTSpecial Marine WarningPHI95 min
Jul 7, 11:19 AM EDTTropical Storm WatchPHIAtlantic, Burlington, Cape May, Monmouth, Ocean18 hr
Jul 7, 3:32 PM EDTFlash Flood WatchPHIAtlantic, Burlington, Camden, Cape May, Cumberland, Gloucester and 10 more42 hr
Jul 6, 8:16 PM EDTSpecial Weather StatementPHILehigh29 min
Jul 6, 10:08 PM EDTSpecial Weather StatementPHIPhiladelphia37 min

Nearby

Severe Thunderstorm Warnings in New Jersey, 2021Severe Thunderstorm Warnings in Pennsylvania, 2021Every 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.