Alert archive / New Jersey / Severe Thunderstorm Warnings in 2024

Severe Thunderstorm Warning 197, NWS Philadelphia/Mount Holly

August 6, 20244 counties in New Jersey

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Aug 6, 2024, 5:06 PM EDT for 4 counties in New Jersey. It was in force for 54 min. 6 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: Aug 6, 2024, 5:06 PM EDT (21:06 UTC)
Expired: Aug 6, 2024, 6:00 PM EDT
In force: 54 min
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

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

The radar

The Philadelphia radar (KDIX), 91 km from the middle of the area, began a volume at 21:08 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
Aug 6, 5:12 PM EDT	HAIL 1	1 W Pleasant Plains, NJ	Delayed Report: Video of estimated to be quarter size hail sent in over social media at Lord Stirling Park. Time estimated from radar.
Aug 6, 5:17 PM EDT	HAIL 0.7	Bedminster Twp, NJ	Delayed Report: Pictures and video of what is estimated to be dime size hail. Time estimated.
Aug 6, 5:24 PM EDT	TSTM WND DMG	Bedminster Twp, NJ	Multiple reports of trees and wires down throughout Bedminster. Time estimated from radar.
Aug 6, 5:25 PM EDT	TSTM WND DMG	Far Hills, NJ	Multiple reports of trees and wires down throughout Far Hills. Time estimated from radar.
Aug 6, 5:33 PM EDT	TSTM WND DMG	1 Wsw Madison, NJ	Cocorahs Report: Multiple trees down within neighborhood of Madison. Time estimated.
Aug 6, 5:36 PM EDT	TSTM WND DMG	Madison, NJ	Reports of several trees down around Madison NJ area. Time estimated from radar.

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
Aug 6, 1:54 PM EDT	Severe Thunderstorm Watch	SPC	7 hr

The nearest sounding before it

Brookhaven, NY (KOKX), launched 12:00Z, 9.1 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: 1440 J/kg
Mixed-layer CIN: -50 J/kg
Mixed-layer LCL: 797 m above ground
0-6 km bulk shear: 41 kt
0-1 km storm-relative helicity: 57 m²/s²
0-3 km storm-relative helicity: 99 m²/s²
Significant tornado parameter: 0.4
Supercell composite: 3.2

Open this sounding in Storm Lab

The text

As transmitted.

847 
WUUS51 KPHI 062106
SVRPHI
NJC019-023-027-035-062200-
/O.NEW.KPHI.SV.W.0197.240806T2106Z-240806T2200Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Mount Holly NJ
506 PM EDT Tue Aug 6 2024

The National Weather Service in Mount Holly NJ has issued a

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

* Until 600 PM EDT.

* At 505 PM EDT, a severe thunderstorm was located over Millington, 
  or 7 miles south of Morristown, moving northeast at 25 mph. 
  Additional thunderstorms are along a line west of Millington and 
  areas of damaging downburst winds can occur.

  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, Somerville, Bridgewater, Dover, Madison, Middlesex,
  Florham Park, East Hanover, Lincoln Park, Bound Brook, Chatham,
  Boonton, Rockaway, Morris Plains, Mendham, Flemington, Mountain
  Lakes, High Bridge, Riverdale, and Clinton.

This includes the following highways...
 Interstate 78 in New Jersey between mile markers 8 and 42.
 Interstate 80 in New Jersey between mile markers 38 and 48.
 Interstate 287 in New Jersey between mile markers 14 and 53.

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

&&

LAT...LON 4091 7434 4083 7433 4079 7437 4076 7438
      4075 7436 4067 7446 4066 7445 4066 7440
      4060 7446 4060 7434 4048 7506 4066 7508
      4100 7430 4097 7428 4092 7429 4090 7427
TIME...MOT...LOC 2105Z 239DEG 20KT 4069 7452 

HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.00 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

Gorse

3 follow-up statements

000 
WWUS51 KPHI 062129
SVSPHI

Severe Weather Statement
National Weather Service Mount Holly NJ
529 PM EDT Tue Aug 6 2024

NJC023-062137-
/O.CAN.KPHI.SV.W.0197.000000T0000Z-240806T2200Z/
Middlesex NJ-
529 PM EDT Tue Aug 6 2024

...THE SEVERE THUNDERSTORM WARNING FOR NORTH CENTRAL MIDDLESEX COUNTY
IS CANCELLED...

The severe thunderstorm which prompted the warning has moved out of 
the warned area. Therefore, this part of the warning has been 
cancelled.

A Severe Thunderstorm Watch remains in effect until 1100 PM EDT for
northern and northwestern New Jersey.

LAT...LON 4091 7434 4083 7433 4079 7437 4076 7438
      4075 7436 4067 7446 4066 7445 4066 7440
      4060 7446 4052 7506 4066 7508 4100 7430
      4097 7428 4092 7429 4090 7427
TIME...MOT...LOC 2127Z 235DEG 13KT 4073 7446 

$$

NJC019-027-035-062200-
/O.CON.KPHI.SV.W.0197.000000T0000Z-240806T2200Z/
Hunterdon NJ-Morris NJ-Somerset NJ-
529 PM EDT Tue Aug 6 2024

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 600 PM EDT
FOR NORTHEASTERN HUNTERDON...CENTRAL MORRIS AND NORTHERN SOMERSET
COUNTIES...

At 527 PM EDT, a severe thunderstorm was located near Madison, or 
near Morristown, moving northeast at 15 mph. Additional severe 
thunderstorms extend back to the west. The strongest thunderstorms 
are in northern Somerset and southern Morris counties.

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, Somerville, Bridgewater, Dover, Madison, Florham Park,
East Hanover, Lincoln Park, Chatham, Boonton, Rockaway, Morris
Plains, Mendham, Mountain Lakes, High Bridge, Riverdale, Clinton,
Peapack And Gladstone, Glen Gardner, and Chester.

This includes the following highways...
 Interstate 78 in New Jersey between mile markers 8 and 42.
 Interstate 80 in New Jersey between mile markers 38 and 48.
 Interstate 287 in New Jersey between mile markers 16 and 53.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

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.

&&

LAT...LON 4091 7434 4083 7433 4079 7437 4076 7438
      4075 7436 4067 7446 4066 7445 4066 7440
      4060 7446 4052 7506 4066 7508 4100 7430
      4097 7428 4092 7429 4090 7427
TIME...MOT...LOC 2127Z 235DEG 13KT 4073 7446 

HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.00 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

Gorse

450 
WWUS51 KPHI 062142
SVSPHI

Severe Weather Statement
National Weather Service Mount Holly NJ
542 PM EDT Tue Aug 6 2024

NJC019-027-035-062200-
/O.CON.KPHI.SV.W.0197.000000T0000Z-240806T2200Z/
Hunterdon NJ-Morris NJ-Somerset NJ-
542 PM EDT Tue Aug 6 2024

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 600 PM EDT
FOR NORTHEASTERN HUNTERDON...SOUTHERN MORRIS AND NORTHERN SOMERSET
COUNTIES...

At 542 PM EDT, a severe thunderstorm was located over Madison, or
near Morristown, moving northeast at 15 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, Florham Park, East Hanover, Lincoln
Park, Chatham, Boonton, Rockaway, Morris Plains, Mendham, Mountain
Lakes, Riverdale, Peapack And Gladstone, Chester, Victory Gardens,
Far Hills, Parsippany, Pequannock Township, and Millington.

This includes the following highways...
 Interstate 78 in New Jersey between mile markers 25 and 39.
 Interstate 80 in New Jersey between mile markers 39 and 48.
 Interstate 287 in New Jersey between mile markers 18 and 53.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

Frequent cloud to ground lightning is occurring with this storm. 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.

&&

LAT...LON 4091 7434 4083 7433 4079 7437 4076 7438
      4075 7436 4067 7446 4066 7445 4057 7471
      4074 7481 4100 7430 4097 7428 4092 7429
      4090 7427
TIME...MOT...LOC 2142Z 225DEG 12KT 4078 7442 

HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.00 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

Gorse

800 
WWUS51 KPHI 062154
SVSPHI

Severe Weather Statement
National Weather Service Mount Holly NJ
554 PM EDT Tue Aug 6 2024

NJC019-027-035-062204-
/O.EXP.KPHI.SV.W.0197.000000T0000Z-240806T2200Z/
Hunterdon NJ-Morris NJ-Somerset NJ-
554 PM EDT Tue Aug 6 2024

...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN HUNTERDON...
SOUTHERN MORRIS AND NORTHERN SOMERSET COUNTIES WILL EXPIRE AT 600 PM
EDT...

The storm which prompted the warning has weakened below severe
limits, and no longer poses an immediate threat to life or property.
Therefore, the warning will be allowed to expire.  However gusty
winds and heavy rain are still possible with this thunderstorm.

A Severe Thunderstorm Watch remains in effect until 1100 PM EDT for
northern and northwestern New Jersey.

LAT...LON 4091 7434 4083 7433 4079 7437 4076 7438
      4075 7436 4067 7446 4066 7445 4057 7471
      4074 7481 4100 7430 4097 7428 4092 7429
      4090 7427
TIME...MOT...LOC 2154Z 239DEG 20KT 4081 7435 

$$

Gorse

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 6, 9:37 AM EDT	Heat Advisory	PHI	Burlington, Camden, Gloucester, Hunterdon, Mercer, Middlesex and 5 more	9 hr
Aug 6, 9:39 AM EDT	Small Craft Advisory	PHI		10 hr
Aug 6, 2:04 PM EDT	Special Marine Warning	PHI		56 min
Aug 6, 2:41 PM EDT	Severe Thunderstorm Warning	PHI	Ocean	19 min
Aug 6, 2:55 PM EDT	Special Marine Warning	PHI		65 min
Aug 6, 3:15 PM EDT	Special Marine Warning	PHI		60 min
Aug 6, 3:18 PM EDT	Severe Thunderstorm Warning	PHI	Monmouth	27 min
Aug 6, 3:21 PM EDT	Severe Thunderstorm Warning	PHI	Burlington	23 min
Aug 6, 3:23 PM EDT	Severe Thunderstorm Warning	PHI	Mercer, Middlesex, Monmouth	37 min
Aug 6, 3:45 PM EDT	Flash Flood Warning	PHI	Middlesex, Monmouth	2 hr
Aug 6, 3:49 PM EDT	Severe Thunderstorm Warning	PHI	Mercer, Middlesex, Monmouth	56 min
Aug 6, 4:10 PM EDT	Special Marine Warning	PHI		65 min
Aug 6, 4:13 PM EDT	Flash Flood Warning	PHI	Mercer, Middlesex, Monmouth	8 hr
Aug 6, 4:32 PM EDT	Severe Thunderstorm Warning	PHI	Hunterdon, Middlesex, Somerset	43 min
Aug 6, 4:37 PM EDT	Severe Thunderstorm Warning	PHI	Hunterdon, Mercer, Middlesex, Somerset	40 min
Aug 6, 4:55 PM EDT	Flash Flood Warning Considerable damage threat	PHI	Monmouth	6 hr
Aug 6, 4:56 PM EDT	Severe Thunderstorm Warning	PHI	Ocean	49 min
Aug 6, 5:29 PM EDT	Flash Flood Warning	PHI	Hunterdon, Middlesex, Morris, Somerset	6 hr
Aug 6, 5:36 PM EDT	Flash Flood Warning	PHI	Monmouth, Ocean	8 hr
Aug 6, 6:37 PM EDT	Flash Flood Warning	PHI	Warren	3 hr
Aug 6, 6:39 PM EDT	Flash Flood Warning	PHI	Burlington, Camden, Gloucester	5 hr
Aug 6, 6:46 PM EDT	Flash Flood Warning	PHI	Morris, Somerset	4 hr
Aug 6, 6:57 PM EDT	Flash Flood Warning	PHI	Warren	3 hr
Aug 6, 7:04 PM EDT	Flash Flood Warning	PHI	Burlington	5 hr
Aug 6, 7:24 PM EDT	Flash Flood Warning	PHI	Burlington, Mercer, Middlesex, Monmouth, Ocean	5 hr

Nearby

Severe Thunderstorm Warnings in New Jersey, 2024 Every severe thunderstorm warning in 2024

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.