Alert archive / New Jersey / Severe Thunderstorm Warnings in 2023

Severe Thunderstorm Warning 191, NWS Philadelphia/Mount Holly

July 14, 20236 counties in New Jersey

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Jul 14, 2023, 6:55 AM EDT for 6 counties in New Jersey. It was in force for 50 min. 3 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 14, 2023, 6:55 AM EDT (10:55 UTC)
Expired: Jul 14, 2023, 7:45 AM EDT
In force: 50 min
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

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

The radar

The Philadelphia radar (KDIX), 91 km from the middle of the area, began a volume at 10:55 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 14, 6:57 AM EDT	TSTM WND DMG	Bernards Twp, NJ	Trees down in Bernards Township. Time estimated via radar.
Jul 14, 7:00 AM EDT	TSTM WND DMG	1 Wnw Chester, NJ	Downed tree on US 206 southbound North of NJ 24/CR 513/West Main St (Chester Twp) All lanes closed. Time estimated via radar.
Jul 14, 7:15 AM EDT	TSTM WND DMG	1 Nnw Morris Twp, NJ	Report of tree damage on South Street in Morristown. Time estimated via radar.

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The nearest sounding before it

Brookhaven, NY (KOKX), launched 00:00Z, 10.9 hours before the alert went out and 135 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: 1347 J/kg
Mixed-layer CIN: -64 J/kg
Mixed-layer LCL: 910 m above ground
0-6 km bulk shear: 35 kt
0-1 km storm-relative helicity: 202 m²/s²
0-3 km storm-relative helicity: 222 m²/s²
Significant tornado parameter: 1.0
Supercell composite: 11.4

Open this sounding in Storm Lab

The text

As transmitted.

816 
WUUS51 KPHI 141055
SVRPHI
NJC019-023-027-035-037-041-141145-
/O.NEW.KPHI.SV.W.0191.230714T1055Z-230714T1145Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Mount Holly NJ
655 AM EDT Fri Jul 14 2023

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...
  South central Sussex County in northwestern New Jersey...
  East central Warren County in northwestern New Jersey...
  Northern Somerset County in northern New Jersey...
  North central Middlesex County in northern New Jersey...

* Until 745 AM EDT.

* At 655 AM EDT, severe thunderstorms were located along a line
  extending from Beatyestown to Peapack And Gladstone to
  Martinsville, moving northeast at 30 mph.

  HAZARD...60 mph wind gusts and penny size hail.

  SOURCE...Radar indicated.

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

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

This includes the following highways...
 Interstate 78 in New Jersey between mile markers 31 and 42.
 Interstate 80 in New Jersey between mile markers 21 and 48.
 Interstate 287 in New Jersey between mile markers 12 and 16, and
between mile markers 20 and 49.

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

&&

LAT...LON 4091 7433 4089 7434 4086 7432 4076 7437
      4075 7436 4067 7446 4066 7445 4066 7440
      4063 7442 4060 7446 4059 7444 4053 7456
      4067 7468 4080 7497 4099 7471 4095 7435
      4091 7431
TIME...MOT...LOC 1055Z 222DEG 25KT 4081 7484 4072 7464 4061 7453 

HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...0.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

MLB

3 follow-up statements

192 
WWUS51 KPHI 141109
SVSPHI

Severe Weather Statement
National Weather Service Mount Holly NJ
709 AM EDT Fri Jul 14 2023

NJC019-023-141119-
/O.CAN.KPHI.SV.W.0191.000000T0000Z-230714T1145Z/
Hunterdon NJ-Middlesex NJ-
709 AM EDT Fri Jul 14 2023

...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN HUNTERDON AND
NORTH CENTRAL MIDDLESEX COUNTIES IS CANCELLED...

The storms which prompted the warning have moved out of the warned 
area. Therefore, the warning has been cancelled.

LAT...LON 4091 7433 4089 7434 4086 7432 4076 7437
      4075 7436 4067 7446 4066 7445 4066 7440
      4063 7442 4062 7443 4074 7464 4085 7490
      4099 7471 4095 7435 4091 7431
TIME...MOT...LOC 1109Z 222DEG 25KT 4088 7476 4079 7456 4068 7445 

$$

NJC027-035-037-041-141145-
/O.CON.KPHI.SV.W.0191.000000T0000Z-230714T1145Z/
Morris NJ-Sussex NJ-Warren NJ-Somerset NJ-
709 AM EDT Fri Jul 14 2023

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 745 AM EDT
FOR MORRIS...SOUTH CENTRAL SUSSEX...EAST CENTRAL WARREN AND
NORTHEASTERN SOMERSET COUNTIES...

At 709 AM EDT, severe thunderstorms were located along a line
extending from Budd Lake to near Mendham to near Millington, moving
northeast at 30 mph.

HAZARD...60 mph wind gusts and penny size hail.

SOURCE...Radar indicated.

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

Locations impacted include...
Morristown, Dover, Madison, Hopatcong, Florham Park, East Hanover,
Hackettstown, Chatham, Boonton, Wharton, Rockaway, Morris Plains,
Mount Arlington, Mendham, Mountain Lakes, Stanhope, Netcong, Peapack
And Gladstone, Chester and Victory Gardens.

This includes the following highways...
 Interstate 78 in New Jersey between mile markers 40 and 42.
 Interstate 80 in New Jersey between mile markers 21 and 48.
 Interstate 287 in New Jersey between mile markers 28 and 49.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4091 7433 4089 7434 4086 7432 4076 7437
      4075 7436 4067 7446 4066 7445 4066 7440
      4063 7442 4062 7443 4074 7464 4085 7490
      4099 7471 4095 7435 4091 7431
TIME...MOT...LOC 1109Z 222DEG 25KT 4088 7476 4079 7456 4068 7445 

HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...0.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

MLB

543 
WWUS51 KPHI 141129
SVSPHI

Severe Weather Statement
National Weather Service Mount Holly NJ
729 AM EDT Fri Jul 14 2023

NJC035-041-141139-
/O.CAN.KPHI.SV.W.0191.000000T0000Z-230714T1145Z/
Warren NJ-Somerset NJ-
729 AM EDT Fri Jul 14 2023

...THE SEVERE THUNDERSTORM WARNING FOR EAST CENTRAL WARREN AND
NORTHEASTERN SOMERSET COUNTIES IS CANCELLED...

The storms which prompted the warning have moved out of the warned 
area. Therefore, the warning has been cancelled.

LAT...LON 4091 7433 4089 7434 4086 7432 4077 7437
      4083 7455 4095 7476 4099 7471 4095 7435
      4091 7431
TIME...MOT...LOC 1129Z 222DEG 25KT 4097 7465 4088 7445 4077 7434 

$$

NJC027-037-141145-
/O.CON.KPHI.SV.W.0191.000000T0000Z-230714T1145Z/
Morris NJ-Sussex NJ-
729 AM EDT Fri Jul 14 2023

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 745 AM EDT
FOR EAST CENTRAL MORRIS AND SOUTH CENTRAL SUSSEX COUNTIES...

At 729 AM EDT, severe thunderstorms were located along a line
extending from Hopatcong to Mountain Lakes to near Millburn, moving
northeast 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...
Morristown, Dover, Hopatcong, Florham Park, East Hanover, Boonton,
Wharton, Rockaway, Morris Plains, Mount Arlington, Mountain Lakes,
Stanhope, Victory Gardens, Parsippany, Lake Telemark,
Succasunna-Kenvil, White Meadow Lake and Hanover Township.

This includes the following highways...
 Interstate 80 in New Jersey between mile markers 30 and 48.
 Interstate 287 in New Jersey between mile markers 37 and 49.

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 7433 4089 7434 4086 7432 4077 7437
      4083 7455 4095 7476 4099 7471 4095 7435
      4091 7431
TIME...MOT...LOC 1129Z 222DEG 25KT 4097 7465 4088 7445 4077 7434 

HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...<.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

MLB

820 
WWUS51 KPHI 141136
SVSPHI

Severe Weather Statement
National Weather Service Mount Holly NJ
736 AM EDT Fri Jul 14 2023

NJC027-037-141145-
/O.EXP.KPHI.SV.W.0191.000000T0000Z-230714T1145Z/
Morris NJ-Sussex NJ-
736 AM EDT Fri Jul 14 2023

...THE SEVERE THUNDERSTORM WARNING FOR EAST CENTRAL MORRIS AND SOUTH
CENTRAL SUSSEX COUNTIES WILL EXPIRE AT 745 AM EDT...
    
The storms which prompted the warning have moved out of the area.
Therefore, the warning will be allowed to expire.

To report severe weather, contact your nearest law enforcement
agency. They will relay your report to the National Weather Service
Mount Holly NJ.

Remember, a Severe Thunderstorm Warning still remains in effect for
portions of Morris and Sussex Counties until 7:45 AM EDT.

LAT...LON 4091 7433 4089 7434 4086 7432 4077 7437
      4083 7455 4095 7476 4099 7471 4095 7435
      4091 7431
TIME...MOT...LOC 1135Z 222DEG 25KT 4100 7462 4091 7442 4080 7431 

$$

MLB

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 13, 8:39 PM EDT	Coastal Flood Advisory	PHI	Ocean	5 hr
Jul 13, 8:53 PM EDT	Severe Thunderstorm Warning	PHI	Sussex	67 min
Jul 13, 9:57 PM EDT	Severe Thunderstorm Warning	PHI	Sussex	48 min
Jul 13, 10:49 PM EDT	Special Weather Statement	PHI	Sussex	26 min
Jul 14, 1:09 AM EDT	Special Weather Statement	PHI	Sussex	21 min
Jul 14, 1:52 AM EDT	Areal Flood Advisory	PHI	Sussex	3 hr
Jul 14, 5:54 AM EDT	Severe Thunderstorm Warning	PHI	Burlington, Mercer, Middlesex, Somerset	51 min
Jul 14, 6:02 AM EDT	Special Weather Statement	PHI	Mercer	28 min
Jul 14, 6:20 AM EDT	Severe Thunderstorm Warning	PHI	Hunterdon, Mercer, Morris, Somerset	40 min
Jul 14, 6:33 AM EDT	Special Weather Statement	PHI	Warren	27 min
Jul 14, 6:35 AM EDT	Special Weather Statement	PHI	Middlesex	25 min
Jul 14, 6:40 AM EDT	Severe Thunderstorm Warning	PHI	Middlesex, Somerset	50 min
Jul 14, 6:59 AM EDT	Special Weather Statement	PHI	Warren	31 min
Jul 14, 7:22 AM EDT	Special Weather Statement	PHI	Sussex	23 min
Jul 14, 7:27 AM EDT	Severe Thunderstorm Warning	PHI	Morris, Sussex	18 min
Jul 14, 7:41 AM EDT	Special Weather Statement	PHI	Sussex	34 min
Jul 14, 4:21 PM EDT	Special Weather Statement	PHI	Somerset	39 min
Jul 14, 4:54 PM EDT	Special Weather Statement	PHI	Somerset	51 min
Jul 14, 6:06 PM EDT	Special Weather Statement	PHI	Morris	24 min
Jul 14, 6:07 PM EDT	Special Weather Statement	PHI	Warren	38 min
Jul 14, 6:20 PM EDT	Special Weather Statement	PHI	Sussex	25 min
Jul 14, 6:22 PM EDT	Severe Thunderstorm Warning	PHI	Warren	38 min
Jul 14, 6:26 PM EDT	Severe Thunderstorm Warning	PHI	Sussex, Warren	49 min
Jul 14, 6:46 PM EDT	Special Weather Statement	PHI	Sussex	29 min
Jul 14, 6:52 PM EDT	Severe Thunderstorm Warning	PHI	Sussex, Warren	53 min
Jul 14, 7:03 PM EDT	Severe Thunderstorm Warning	PHI	Sussex	41 min
Jul 14, 7:08 PM EDT	Areal Flood Advisory	PHI	Sussex, Warren	39 min
Jul 14, 7:20 PM EDT	Special Weather Statement	PHI	Warren	25 min
Jul 14, 7:40 PM EDT	Flash Flood Warning	PHI	Morris, Sussex, Warren	6 hr
Jul 14, 7:46 PM EDT	Areal Flood Advisory	PHI	Sussex	2 hr

Nearby

Severe Thunderstorm Warnings in New Jersey, 2023 Every severe thunderstorm warning in 2023

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.