Alert archive / New Jersey / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 235, NWS Philadelphia/Mount Holly

July 29, 20215 counties in New Jersey

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Jul 29, 2021, 7:28 PM EDT for 5 counties in New Jersey. It was in force for 47 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 29, 2021, 7:28 PM EDT (23:28 UTC)
Expired: Jul 29, 2021, 8:15 PM EDT
In force: 47 min
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon
Tornado: Possible
Hail: 0.75 in
Wind: 60.0 mph

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

The radar

The Philadelphia radar (KDIX), 26 km from the middle of the area, began a volume at 23:31 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 29, 2:23 PM EDT	Tornado Watch	SPC	8 hr

The nearest sounding before it

Brookhaven, NY (KOKX), launched 12:00Z, 11.5 hours before the alert went out and 159 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: 54 J/kg
Mixed-layer CIN: -32 J/kg
Mixed-layer LCL: 823 m above ground
0-6 km bulk shear: 29 kt
0-1 km storm-relative helicity: 65 m²/s²
0-3 km storm-relative helicity: 127 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.1

Open this sounding in Storm Lab

The text

As transmitted.

452 
WUUS51 KPHI 292328
SVRPHI
NJC005-021-023-025-029-300015-
/O.NEW.KPHI.SV.W.0235.210729T2328Z-210730T0015Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Mount Holly NJ
728 PM EDT Thu Jul 29 2021

The National Weather Service in Mount Holly NJ has issued a

* Severe Thunderstorm Warning for...
  Northwestern Ocean County in southern New Jersey...
  Southeastern Mercer County in central New Jersey...
  Northern Burlington County in southern New Jersey...
  Southwestern Monmouth County in central New Jersey...
  Southwestern Middlesex County in northern New Jersey...

* Until 815 PM EDT.

* At 727 PM EDT, a severe thunderstorm was located over
  Mercerville-Hamilton Square, or 7 miles east of Trenton, moving
  east at 30 mph.

  HAZARD...60 mph wind gusts.

  SOURCE...Radar indicated.

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

* Locations impacted include...
  Toms River, Trenton, Lakewood, Jackson, Howell, Manalapan,
  Hightstown, Bordentown, Cranbury, Allentown, Roosevelt, Windsor,
  East Freehold, Six Flags Theme Park, Cedar Glen West, Jacksons
  Mills, West Freehold, Clearbrook Park, Cassville and Adelphia.

This includes the following highways...
 New Jersey Turnpike between exits 8 and 8A.
 Interstate 195 in New Jersey between mile markers 0 and 29.
 Interstate 295 in New Jersey between mile markers 58 and 68.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Tornado Watch remains in effect until 900 PM EDT for southern,
central and northern New Jersey...and southeastern Pennsylvania.

Remain alert for a possible tornado! Tornadoes can develop quickly
from severe thunderstorms. If you spot a tornado go at once into the
basement or small central room in a sturdy structure.

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

&&

LAT...LON 4003 7424 4015 7472 4017 7473 4018 7475
      4032 7471 4030 7416
TIME...MOT...LOC 2327Z 284DEG 25KT 4021 7462 

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

Fitzsimmons

2 follow-up statements

357 
WWUS51 KPHI 292343
SVSPHI

Severe Weather Statement
National Weather Service Mount Holly NJ
743 PM EDT Thu Jul 29 2021

NJC005-292353-
/O.CAN.KPHI.SV.W.0235.000000T0000Z-210730T0015Z/
Burlington NJ-
743 PM EDT Thu Jul 29 2021

...THE SEVERE THUNDERSTORM WARNING FOR NORTHERN BURLINGTON COUNTY IS
CANCELLED...
    
The severe thunderstorm which prompted the warning has moved out of 
the warned area. Therefore, the warning has been cancelled.

A Tornado Watch remains in effect until 900 PM EDT for southern,
central and northern New Jersey.

LAT...LON 4003 7424 4011 7458 4014 7459 4014 7462
      4015 7464 4016 7464 4016 7461 4031 7453
      4030 7416
TIME...MOT...LOC 2343Z 284DEG 25KT 4018 7447 

$$

NJC021-023-025-029-300015-
/O.CON.KPHI.SV.W.0235.000000T0000Z-210730T0015Z/
Ocean NJ-Mercer NJ-Monmouth NJ-Middlesex NJ-
743 PM EDT Thu Jul 29 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 815 PM EDT
FOR NORTHWESTERN OCEAN...SOUTHEASTERN MERCER...SOUTHWESTERN MONMOUTH
AND SOUTH CENTRAL MIDDLESEX COUNTIES...

At 743 PM EDT, a severe thunderstorm was located over Clarksburg, or
15 miles east of Trenton, moving east 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, Lakewood, Jackson, Howell, Manalapan, Hightstown,
Cranbury, Allentown, Roosevelt, East Freehold, Six Flags Theme Park,
Cedar Glen West, Jacksons Mills, West Freehold, Cassville, Adelphia,
Clarksburg, Vista Center, Twin Rivers and Imlaystown.

This includes the following highways...
 New Jersey Turnpike near exit 8A.
 Interstate 195 in New Jersey between mile markers 8 and 29.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Tornado Watch remains in effect until 900 PM EDT for southern,
central and northern New Jersey.

Remain alert for a possible tornado! Tornadoes can develop quickly
from severe thunderstorms. If you spot a tornado go at once into the
basement or small central room in a sturdy structure.

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 this storm, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.

&&

LAT...LON 4003 7424 4011 7458 4014 7459 4014 7462
      4015 7464 4016 7464 4016 7461 4031 7453
      4030 7416
TIME...MOT...LOC 2343Z 284DEG 25KT 4018 7447 

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

Staarmann

545 
WWUS51 KPHI 292359
SVSPHI

Severe Weather Statement
National Weather Service Mount Holly NJ
759 PM EDT Thu Jul 29 2021

NJC021-023-300009-
/O.CAN.KPHI.SV.W.0235.000000T0000Z-210730T0015Z/
Mercer NJ-Middlesex NJ-
759 PM EDT Thu Jul 29 2021

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN MERCER AND SOUTH
CENTRAL MIDDLESEX COUNTIES IS CANCELLED...
    
The severe thunderstorm which prompted the warning has moved out of 
the warned area. Therefore, the warning has been cancelled.

A Tornado Watch remains in effect until 900 PM EDT for southern and
central New Jersey.

LAT...LON 4003 7424 4011 7458 4018 7443 4030 7434
      4030 7416
TIME...MOT...LOC 2359Z 284DEG 25KT 4015 7433 

$$

NJC025-029-300015-
/O.CON.KPHI.SV.W.0235.000000T0000Z-210730T0015Z/
Ocean NJ-Monmouth NJ-
759 PM EDT Thu Jul 29 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 815 PM EDT
FOR NORTHWESTERN OCEAN AND SOUTHWESTERN MONMOUTH COUNTIES...

At 759 PM EDT, a severe thunderstorm was located over Jacksons Mills,
or 13 miles northwest of Toms River, moving east 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, Lakewood, Jackson, Howell, Cassville, Adelphia, Vista
Center, East Freehold, Six Flags Theme Park, Cream Ridge, Cedar Glen
West, Freewood Acres, Jacksons Mills, West Freehold, Yorketown and
Freehold.

This includes Interstate 195 in New Jersey between mile markers 16
and 29.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Tornado Watch remains in effect until 900 PM EDT for southern and
central New Jersey.

Remain alert for a possible tornado! Tornadoes can develop quickly
from severe thunderstorms. If you spot a tornado go at once into the
basement or small central room in a sturdy structure.

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 this storm, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.

&&

LAT...LON 4003 7424 4011 7458 4018 7443 4030 7434
      4030 7416
TIME...MOT...LOC 2359Z 284DEG 25KT 4015 7433 

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

Staarmann

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 29, 3:33 AM EDT	Small Craft Advisory	PHI		20 hr
Jul 29, 1:33 PM EDT	Special Marine Warning	PHI		42 min
Jul 29, 2:53 PM EDT	Special Marine Warning	PHI		100 min
Jul 29, 4:26 PM EDT	Special Weather Statement	PHI	Morris	34 min
Jul 29, 4:30 PM EDT	Severe Thunderstorm Warning	PHI	Hunterdon, Warren	45 min
Jul 29, 4:57 PM EDT	Areal Flood Advisory	PHI	Hunterdon, Morris, Sussex, Warren	3 hr
Jul 29, 5:01 PM EDT	Special Weather Statement	PHI	Morris	29 min
Jul 29, 5:03 PM EDT	Severe Thunderstorm Warning	PHI	Hunterdon, Morris, Somerset, Sussex, Warren	42 min
Jul 29, 5:08 PM EDT	Tornado Warning	PHI	Hunterdon	37 min
Jul 29, 5:27 PM EDT	Areal Flood Advisory	PHI	Hunterdon, Mercer, Morris, Somerset	3 hr
Jul 29, 5:32 PM EDT	Flash Flood Warning	PHI	Warren	2 hr
Jul 29, 5:32 PM EDT	Tornado Warning	PHI	Hunterdon	28 min
Jul 29, 5:51 PM EDT	Tornado Warning Tornado observedConsiderable damage threat	PHI	Hunterdon, Mercer	24 min
Jul 29, 5:58 PM EDT	Flash Flood Warning	PHI	Hunterdon, Mercer, Somerset	3 hr
Jul 29, 6:06 PM EDT	Tornado Warning Considerable damage threat	PHI	Burlington, Hunterdon, Mercer, Middlesex, Monmouth	39 min
Jul 29, 6:44 PM EDT	Tornado Warning	PHI	Mercer, Monmouth, Ocean	46 min
Jul 29, 6:45 PM EDT	Severe Thunderstorm Warning	PHI	Burlington, Mercer	45 min
Jul 29, 6:56 PM EDT	Flash Flood Warning	PHI	Mercer, Middlesex, Monmouth, Ocean, Somerset	4 hr
Jul 29, 7:07 PM EDT	Tornado Warning	PHI	Burlington	23 min
Jul 29, 7:12 PM EDT	Flash Flood Warning	PHI	Burlington	4 hr
Jul 29, 7:18 PM EDT	Tornado Warning	PHI	Mercer, Middlesex, Monmouth, Ocean	27 min
Jul 29, 7:25 PM EDT	Severe Thunderstorm Warning	PHI	Burlington, Monmouth, Ocean	50 min
Jul 29, 7:52 PM EDT	Special Marine Warning	PHI		113 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.