Alert archive / New Jersey / Severe Thunderstorm Warnings in 2023

Severe Thunderstorm Warning 199, NWS Philadelphia/Mount Holly

July 14, 2023Middlesex County, Morris County, Somerset County, New Jersey

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Jul 14, 2023, 9:57 PM EDT for Middlesex County, Morris County, Somerset County, New Jersey. It was in force for 41 min. 2 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, 9:57 PM EDT (01:57 UTC)
Expired: Jul 14, 2023, 10:38 PM EDT
In force: 41 min
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

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

The radar

The Philadelphia radar (KDIX), 86 km from the middle of the area, began a volume at 02:00 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, 10:20 PM EDT	TSTM WND DMG	3 Ne Long Hill Twp, NJ	Trees down in Long Hill. Time estimated via radar.
Jul 14, 10:20 PM EDT	TSTM WND DMG	Madison, NJ	Trees down in Madison. 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, 2.0 hours before the alert went out and 132 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: 996 J/kg
Mixed-layer CIN: -19 J/kg
Mixed-layer LCL: 628 m above ground
0-6 km bulk shear: 24 kt
0-1 km storm-relative helicity: 102 m²/s²
0-3 km storm-relative helicity: 193 m²/s²
Significant tornado parameter: 0.5
Supercell composite: 3.8

Open this sounding in Storm Lab

The text

As transmitted.

559 
WUUS51 KPHI 150157
SVRPHI
NJC023-027-035-150300-
/O.NEW.KPHI.SV.W.0199.230715T0157Z-230715T0300Z/

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

The National Weather Service in Mount Holly NJ has issued a

* Severe Thunderstorm Warning for...
  Southeastern Morris County in northern New Jersey...
  Northeastern Somerset County in northern New Jersey...
  North central Middlesex County in northern New Jersey...

* Until 1100 PM EDT.

* At 957 PM EDT, severe thunderstorms were located along a line
  extending from near Morristown to Far Hills, moving east at 10 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, Madison, Middlesex, Florham Park, East Hanover, Bound
  Brook, Chatham, Morris Plains, Mendham, Mountain Lakes, Peapack And
  Gladstone, Far Hills, Parsippany, Martinsville, Millington, Society
  Hill, Basking Ridge, South Plainfield, North Plainfield and
  Bernardsville.

This includes the following highways...
 Interstate 78 in New Jersey between mile markers 29 and 42.
 Interstate 80 in New Jersey between mile markers 41 and 48.
 Interstate 287 in New Jersey between mile markers 4 and 9, and
between mile markers 19 and 43.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

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

&&

LAT...LON 4082 7434 4079 7437 4076 7437 4075 7436
      4067 7446 4066 7445 4066 7440 4063 7442
      4060 7446 4060 7436 4051 7442 4063 7469
      4086 7459 4089 7434 4086 7432
TIME...MOT...LOC 0157Z 274DEG 7KT 4080 7455 4066 7463 

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

$$

Staarmann

3 follow-up statements

372 
WWUS51 KPHI 150209
SVSPHI

Severe Weather Statement
National Weather Service Mount Holly NJ
1009 PM EDT Fri Jul 14 2023

NJC023-027-035-150300-
/O.CON.KPHI.SV.W.0199.000000T0000Z-230715T0300Z/
Morris NJ-Somerset NJ-Middlesex NJ-
1009 PM EDT Fri Jul 14 2023

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1100 PM EDT
FOR SOUTHEASTERN MORRIS...NORTHEASTERN SOMERSET AND NORTH CENTRAL
MIDDLESEX COUNTIES...

At 1009 PM EDT, severe thunderstorms were located along a line
extending from Madison to near Millington, moving east at 20 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, Madison, Middlesex, Florham Park, East Hanover, Bound
Brook, Chatham, Morris Plains, Mendham, Far Hills, Martinsville,
Millington, Society Hill, Basking Ridge, South Plainfield, North
Plainfield, Bernardsville, Dunellen, Watchung and South Bound Brook.

This includes the following highways...
 Interstate 78 in New Jersey between mile markers 31 and 42.
 Interstate 287 in New Jersey between mile markers 4 and 9, between
mile markers 19 and 21, and between mile markers 23 and 41.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

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

&&

LAT...LON 4082 7434 4079 7437 4076 7437 4075 7436
      4067 7446 4066 7445 4066 7440 4063 7442
      4060 7446 4060 7436 4051 7442 4062 7466
      4085 7456 4086 7432
TIME...MOT...LOC 0209Z 279DEG 16KT 4078 7443 4064 7451 

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

$$

Staarmann

142 
WWUS51 KPHI 150227
SVSPHI

Severe Weather Statement
National Weather Service Mount Holly NJ
1027 PM EDT Fri Jul 14 2023

NJC023-150237-
/O.CAN.KPHI.SV.W.0199.000000T0000Z-230715T0300Z/
Middlesex NJ-
1027 PM EDT Fri Jul 14 2023

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

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

LAT...LON 4082 7434 4079 7437 4076 7438 4075 7436
      4068 7445 4066 7445 4066 7441 4065 7440
      4060 7445 4061 7449 4084 7450 4086 7432
TIME...MOT...LOC 0227Z 272DEG 14KT 4078 7439 4068 7441 

$$

NJC027-035-150300-
/O.CON.KPHI.SV.W.0199.000000T0000Z-230715T0300Z/
Morris NJ-Somerset NJ-
1027 PM EDT Fri Jul 14 2023

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1100 PM EDT
FOR SOUTHEASTERN MORRIS AND EAST CENTRAL SOMERSET COUNTIES...

At 1027 PM EDT, severe thunderstorms were located along a line
extending from Florham Park to near Summit, moving east 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, Madison, Florham Park, East Hanover, Chatham, Morris
Plains, North Plainfield, Watchung and Hanover Township.

This includes the following highways...
 Interstate 78 in New Jersey between mile markers 40 and 42.
 Interstate 287 in New Jersey between mile markers 34 and 40.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

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

&&

LAT...LON 4082 7434 4079 7437 4076 7438 4075 7436
      4068 7445 4066 7445 4066 7441 4065 7440
      4060 7445 4061 7449 4084 7450 4086 7432
TIME...MOT...LOC 0227Z 272DEG 14KT 4078 7439 4068 7441 

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

$$

Staarmann

201 
WWUS51 KPHI 150238
SVSPHI

Severe Weather Statement
National Weather Service Mount Holly NJ
1038 PM EDT Fri Jul 14 2023

NJC027-035-150248-
/O.CAN.KPHI.SV.W.0199.000000T0000Z-230715T0300Z/
Morris NJ-Somerset NJ-
1038 PM EDT Fri Jul 14 2023

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN MORRIS AND EAST
CENTRAL SOMERSET COUNTIES IS CANCELLED...
    
The storms which prompted the warning have weakened below severe
limits, and have exited the warned area. Therefore, the warning has 
been cancelled. However heavy rain is still possible with these 
thunderstorms.

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

LAT...LON 4082 7434 4079 7437 4076 7438 4075 7436
      4068 7445 4066 7445 4066 7441 4065 7440
      4060 7445 4061 7449 4084 7450 4086 7432
TIME...MOT...LOC 0235Z 274DEG 7KT 4078 7437 4068 7439 

$$

Staarmann

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 14, 8:05 PM EDT	Special Weather Statement	PHI	Morris	40 min
Jul 14, 8:29 PM EDT	Flash Flood Warning	PHI	Morris	4 hr
Jul 14, 9:13 PM EDT	Areal Flood Advisory	PHI	Hunterdon, Morris, Somerset, Warren	3 hr
Jul 14, 9:51 PM EDT	Special Weather Statement	PHI	Morris, Somerset	24 min
Jul 14, 11:32 PM EDT	Special Weather Statement	PHI	Mercer, Monmouth	28 min
Jul 15, 3:44 AM EDT	Flood Watch	PHI	Atlantic, Burlington, Camden, Cape May, Cumberland, Gloucester and 10 more	38 hr
Jul 15, 1:33 PM EDT	Special Marine Warning	PHI		57 min
Jul 15, 1:43 PM EDT	Special Weather Statement	PHI	Salem	32 min
Jul 15, 2:56 PM EDT	Special Weather Statement	PHI	Mercer	34 min
Jul 15, 3:08 PM EDT	Special Weather Statement	PHI	Hunterdon	37 min
Jul 15, 3:22 PM EDT	Severe Thunderstorm Warning	PHI	Middlesex, Somerset	38 min
Jul 15, 3:29 PM EDT	Special Marine Warning	PHI		61 min
Jul 15, 3:30 PM EDT	Special Weather Statement	PHI	Salem	30 min
Jul 15, 3:40 PM EDT	Severe Thunderstorm Warning	PHI	Cumberland, Salem	65 min
Jul 15, 4:08 PM EDT	Severe Thunderstorm Warning	PHI	Hunterdon, Mercer, Somerset	67 min
Jul 15, 4:11 PM EDT	Special Weather Statement	PHI	Gloucester	34 min
Jul 15, 4:31 PM EDT	Areal Flood Advisory	PHI	Hunterdon, Mercer	106 min
Jul 15, 4:52 PM EDT	Special Weather Statement	PHI	Cumberland	23 min
Jul 15, 4:53 PM EDT	Special Weather Statement	PHI	Middlesex	37 min
Jul 15, 5:00 PM EDT	Areal Flood Advisory	PHI	Hunterdon, Mercer, Middlesex, Somerset	2 hr
Jul 15, 5:12 PM EDT	Severe Thunderstorm Warning	PHI	Mercer, Middlesex	63 min
Jul 15, 5:18 PM EDT	Flash Flood Warning	PHI	Hunterdon, Mercer, Middlesex, Somerset	4 hr
Jul 15, 5:27 PM EDT	Areal Flood Advisory	PHI	Cumberland, Salem	99 min
Jul 15, 5:45 PM EDT	Severe Thunderstorm Warning	PHI	Hunterdon, Morris, Sussex, Warren	45 min
Jul 15, 5:49 PM EDT	Severe Thunderstorm Warning	PHI	Middlesex, Monmouth	41 min
Jul 15, 6:09 PM EDT	Flash Flood Warning Considerable damage threat	PHI	Mercer	4 hr
Jul 15, 6:21 PM EDT	Special Weather Statement	PHI	Mercer	24 min

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.