Alert archive / New Jersey / Severe Thunderstorm Warnings in 2023

Severe Thunderstorm Warning 349, NWS Philadelphia/Mount Holly

September 9, 2023Middlesex County, Monmouth County, Somerset County, New Jersey

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Sep 9, 2023, 2:42 PM EDT for Middlesex County, Monmouth County, Somerset County, New Jersey. It was in force for 48 min. 12 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: Sep 9, 2023, 2:42 PM EDT (18:42 UTC)
Expired: Sep 9, 2023, 3:30 PM EDT
In force: 48 min
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

Counties Middlesex County, NJ, Monmouth County, NJ, Somerset County, NJ

The radar

The Philadelphia radar (KDIX), 52 km from the middle of the area, began a volume at 18:45 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
Sep 9, 2:50 PM EDT	HAIL 1	Spotswood, NJ
Sep 9, 2:55 PM EDT	HAIL 0.88	East Brunswick, NJ	Two nickel size hail reports in East Brunswick. Time given in report.
Sep 9, 3:00 PM EDT	HAIL 1	East Brunswick, NJ	Corrects previous hail report from East Brunswick. Quarter size hail in East Brunswick. Time given in report.
Sep 9, 3:05 PM EDT	HAIL 1	North Brunswick, NJ	Hail of at least quarter size reported in North Brunswick.
Sep 9, 3:10 PM EDT	HAIL 1	New Brunswick, NJ
Sep 9, 3:14 PM EDT	HAIL 0.75	1 N Milltown, NJ	Social media photo of penny sized hail near Ryders Lane and Route 1.
Sep 9, 3:15 PM EDT	HAIL 1.75	New Brunswick, NJ	Hail up to the size of golf balls in New Brunswick. Time estimated via radar.
Sep 9, 3:16 PM EDT	HAIL 0.7	Milltown, NJ	Social media photo of dime sized hail.
Sep 9, 3:19 PM EDT	HAIL 1	1 Se New Brunswick, NJ	Report from mPING: Quarter (1.00 in.).
Sep 9, 3:20 PM EDT	HAIL 0.5	New Brunswick, NJ	One quarter to one half inch hail at Rutgers U.
Sep 9, 3:22 PM EDT	HAIL 0.5	1 Ene Highland Park, NJ	Report from mPING: Half-inch (0.50 in.).
Sep 9, 3:22 PM EDT	HAIL 0.5	3 S Dunellen, NJ

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 12:00Z, 6.7 hours before the alert went out and 138 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: 1962 J/kg
Mixed-layer CIN: -6 J/kg
Mixed-layer LCL: 541 m above ground
0-6 km bulk shear: 19 kt
0-1 km storm-relative helicity: 55 m²/s²
0-3 km storm-relative helicity: 33 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

950 
WUUS51 KPHI 091842
SVRPHI
NJC023-025-035-091930-
/O.NEW.KPHI.SV.W.0349.230909T1842Z-230909T1930Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Mount Holly NJ
242 PM EDT Sat Sep 9 2023

The National Weather Service in Mount Holly NJ has issued a

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

* Until 330 PM EDT.

* At 242 PM EDT, a severe thunderstorm was located over East
  Brunswick, or 7 miles south of New Brunswick, moving north 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...
  New Brunswick, Perth Amboy, Somerville, Somerset, Edison, Old
  Bridge, East Brunswick, South Brunswick, Sayreville, North
  Brunswick, Bound Brook, Manville, Matawan, Jamesburg, Cranbury,
  Millstone, Princeton Meadows, Brownville, Kingston and Dayton.

This includes the following highways...
 New Jersey Turnpike between exits 9 and 12.
 Interstate 287 in New Jersey between mile markers 0 and 4, and
between mile markers 9 and 12.
 Garden State Parkway between mile markers 120 and 130.

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, and
the storm will affect the beaches. For your safety, immediately move
off the beach and seek shelter indoors.

&&

LAT...LON 4030 7426 4031 7459 4032 7460 4032 7461
      4056 7463 4055 7425 4050 7426 4050 7428
      4046 7426 4045 7422
TIME...MOT...LOC 1842Z 193DEG 8KT 4039 7440 

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

$$

MLB

3 follow-up statements

030 
WWUS51 KPHI 091847
SVSPHI

Severe Weather Statement
National Weather Service Mount Holly NJ
247 PM EDT Sat Sep 9 2023

NJC023-025-035-091930-
/O.CON.KPHI.SV.W.0349.000000T0000Z-230909T1930Z/
Somerset NJ-Monmouth NJ-Middlesex NJ-
247 PM EDT Sat Sep 9 2023

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 330 PM EDT
FOR SOUTHEASTERN SOMERSET...NORTH CENTRAL MONMOUTH AND MIDDLESEX
COUNTIES...

At 246 PM EDT, a severe thunderstorm was located over East Brunswick,
or near New Brunswick, moving north at 10 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...
New Brunswick, Perth Amboy, Somerville, Somerset, Edison, Old Bridge,
East Brunswick, South Brunswick, Sayreville, North Brunswick, Bound
Brook, Manville, Matawan, Jamesburg, Cranbury, Millstone, Princeton
Meadows, Brownville, Kingston and Dayton.

This includes the following highways...
 New Jersey Turnpike between exits 9 and 12.
 Interstate 287 in New Jersey between mile markers 0 and 4, and
between mile markers 9 and 12.
 Garden State Parkway between mile markers 120 and 130.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4030 7426 4031 7459 4032 7460 4032 7461
      4056 7463 4055 7425 4050 7426 4050 7428
      4046 7426 4045 7422
TIME...MOT...LOC 1846Z 193DEG 8KT 4040 7440 

HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.25 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

MLB

469 
WWUS51 KPHI 091903
SVSPHI

Severe Weather Statement
National Weather Service Mount Holly NJ
303 PM EDT Sat Sep 9 2023

NJC025-091912-
/O.CAN.KPHI.SV.W.0349.000000T0000Z-230909T1930Z/
Monmouth NJ-
303 PM EDT Sat Sep 9 2023

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

LAT...LON 4044 7424 4030 7442 4031 7459 4032 7461
      4056 7463 4055 7425 4050 7426 4050 7428
      4046 7426 4045 7422
TIME...MOT...LOC 1902Z 188DEG 8KT 4044 7442 

$$

NJC023-035-091930-
/O.CON.KPHI.SV.W.0349.000000T0000Z-230909T1930Z/
Somerset NJ-Middlesex NJ-
303 PM EDT Sat Sep 9 2023

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 330 PM EDT
FOR SOUTHEASTERN SOMERSET AND MIDDLESEX COUNTIES...

At 302 PM EDT, a trained spotter relayed a report of quarter sized 
hail in East Brunswick. This severe thunderstorm was located over 
East Brunswick, or near New Brunswick, moving north at 10 mph.

HAZARD...60 mph wind gusts and half dollar size hail.

SOURCE...Trained weather spotters.

IMPACT...Minor damage to vehicles is possible. Wind damage to roofs, 
         siding, trees, and power lines is possible.

Locations impacted include...
New Brunswick, Perth Amboy, Somerville, Somerset, Edison, Old Bridge,
East Brunswick, South Brunswick, Sayreville, North Brunswick, Bound
Brook, Manville, Jamesburg, Cranbury, Millstone, Princeton Meadows,
Brownville, Kingston, Dayton and Plainsboro Center.

This includes the following highways...
 New Jersey Turnpike between exits 9 and 12.
 Interstate 287 in New Jersey between mile markers 0 and 4, and
between mile markers 9 and 12.
 Garden State Parkway between mile markers 121 and 130.

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.

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

&&

LAT...LON 4044 7424 4030 7442 4031 7459 4032 7461
      4056 7463 4055 7425 4050 7426 4050 7428
      4046 7426 4045 7422
TIME...MOT...LOC 1902Z 188DEG 8KT 4044 7442 

HAIL THREAT...OBSERVED
MAX HAIL SIZE...1.25 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

Staarmann

010 
WWUS51 KPHI 091914
SVSPHI

Severe Weather Statement
National Weather Service Mount Holly NJ
314 PM EDT Sat Sep 9 2023

NJC023-035-091930-
/O.CON.KPHI.SV.W.0349.000000T0000Z-230909T1930Z/
Somerset NJ-Middlesex NJ-
314 PM EDT Sat Sep 9 2023

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 330 PM EDT
FOR SOUTHEASTERN SOMERSET AND MIDDLESEX COUNTIES...

At 313 PM EDT, a severe thunderstorm was located over New Brunswick, 
moving north at 10 mph. A trained spotter relayed a report of 
quarter sized hail in East Brunswick.

HAZARD...Two inch hail and 60 mph wind gusts.

SOURCE...Trained weather spotters.

IMPACT...People and animals outdoors will be injured. Expect hail 
         damage to roofs, siding, windows, and vehicles. Wind damage 
         to roofs, siding, trees, and power lines is possible.

Locations impacted include...
New Brunswick, Perth Amboy, Somerville, Somerset, Edison, Old Bridge,
East Brunswick, South Brunswick, Sayreville, North Brunswick, Bound
Brook, Manville, Jamesburg, Cranbury, Millstone, Princeton Meadows,
Dayton, North Brunswick Township, Clearbrook Park and Whittingham.

This includes the following highways...
 New Jersey Turnpike between exits 9 and 12.
 Interstate 287 in New Jersey between mile markers 0 and 4, and
between mile markers 9 and 12.
 Garden State Parkway between mile markers 123 and 130.

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.

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

&&

LAT...LON 4030 7442 4031 7459 4056 7463 4055 7425
      4050 7426 4050 7428 4046 7426
TIME...MOT...LOC 1913Z 188DEG 8KT 4048 7444 

THUNDERSTORM DAMAGE THREAT...CONSIDERABLE
HAIL THREAT...OBSERVED
MAX HAIL SIZE...2.00 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

Staarmann

The office that day

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

Issued	Product	Office	Counties	Lasted
Sep 8, 10:17 PM EDT	Severe Thunderstorm Warning	PHI	Gloucester, Salem	43 min
Sep 8, 10:58 PM EDT	Severe Thunderstorm Warning	PHI	Camden, Gloucester	47 min
Sep 9, 12:56 PM EDT	Severe Thunderstorm Warning	PHI	Atlantic, Burlington, Ocean	64 min
Sep 9, 12:57 PM EDT	Severe Thunderstorm Warning	PHI	Burlington, Ocean	50 min
Sep 9, 1:17 PM EDT	Special Weather Statement	PHI	Ocean	28 min
Sep 9, 1:46 PM EDT	Special Weather Statement	PHI	Ocean	29 min
Sep 9, 2:07 PM EDT	Special Weather Statement	PHI	Atlantic	38 min
Sep 9, 2:16 PM EDT	Special Weather Statement	PHI	Burlington	29 min
Sep 9, 2:26 PM EDT	Special Weather Statement	PHI	Middlesex	34 min
Sep 9, 3:09 PM EDT	Severe Thunderstorm Warning Considerable damage threat	PHI	Middlesex, Somerset	49 min
Sep 9, 3:34 PM EDT	Severe Thunderstorm Warning	PHI	Burlington, Camden, Gloucester	56 min
Sep 9, 3:40 PM EDT	Areal Flood Advisory	PHI	Middlesex, Morris, Somerset	2 hr
Sep 9, 3:47 PM EDT	Severe Thunderstorm Warning	PHI	Morris	43 min
Sep 9, 3:58 PM EDT	Special Weather Statement	PHI	Somerset	32 min
Sep 9, 4:05 PM EDT	Flash Flood Warning	PHI	Burlington, Camden, Gloucester	4 hr
Sep 9, 4:08 PM EDT	Severe Thunderstorm Warning	PHI	Morris, Somerset, Sussex	53 min
Sep 9, 4:37 PM EDT	Severe Thunderstorm Warning	PHI	Morris, Sussex, Warren	53 min
Sep 9, 4:40 PM EDT	Special Marine Warning	PHI		65 min
Sep 9, 4:42 PM EDT	Areal Flood Advisory	PHI	Morris	3 hr
Sep 9, 4:49 PM EDT	Special Weather Statement	PHI	Warren	41 min
Sep 9, 4:57 PM EDT	Severe Thunderstorm Warning	PHI	Sussex, Warren	49 min
Sep 9, 5:18 PM EDT	Severe Thunderstorm Warning	PHI	Sussex, Warren	45 min
Sep 9, 5:34 PM EDT	Special Weather Statement	PHI	Salem	26 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.