Alert archive / New Jersey / Severe Thunderstorm Warnings in 2020

Severe Thunderstorm Warning 184, NWS Philadelphia/Mount Holly

July 24, 20204 counties in New Jersey

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Jul 24, 2020, 2:18 AM EDT for 4 counties in New Jersey. It was in force for 42 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 24, 2020, 2:18 AM EDT (06:18 UTC)
Expired: Jul 24, 2020, 3:00 AM EDT
In force: 42 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

The radar

The Philadelphia radar (KDIX), 70 km from the middle of the area, began a volume at 06:17 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 24, 2:18 AM EDT	TSTM WND DMG	1 Se Somerset, NJ	DOWNED POWER POLE AND POWER LINES ON HEATHER DRIVE NEAR JFK BOULEVARD IN SOMERSET. TIME ESTIMATED FROM RADAR.
Jul 24, 2:18 AM EDT	TSTM WND DMG	South Bound Brook, NJ	CORRECTS PREVIOUS TSTM WND DMG REPORT FROM SOUTH BOUND BROOK. REPORTS OF WIRES DOWN IN THE BOUND BROOK AND SOUTH BOUND BROOK AREAS. TIME ESTIMATED FROM RADAR.
Jul 24, 2:31 AM EDT	TSTM WND DMG	3 N New Brunswick, NJ	SEVERAL REPORTS OF UTILITY POLES AND WIRES DOWN IN THE NEW BRUNSWICK AND SOCIETY HILL AREAS. TIME ESTIMATED FROM 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, 6.3 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: 1702 J/kg
Mixed-layer CIN: -49 J/kg
Mixed-layer LCL: 797 m above ground
0-6 km bulk shear: 20 kt
0-1 km storm-relative helicity: 111 m²/s²
0-3 km storm-relative helicity: 116 m²/s²
Significant tornado parameter: 0.6
Supercell composite: 4.0

Open this sounding in Storm Lab

The text

As transmitted.

619 
WUUS51 KPHI 240618
SVRPHI
NJC019-023-027-035-240700-
/O.NEW.KPHI.SV.W.0184.200724T0618Z-200724T0700Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Mount Holly NJ
218 AM EDT Fri Jul 24 2020

The National Weather Service in Mount Holly NJ has issued a

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

* Until 300 AM EDT.

* At 218 AM EDT, severe thunderstorms were located along a line
  extending from near White House Station to near Tottenville, 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...
  New Brunswick, Perth Amboy, Somerville, Somerset, Edison, East
  Brunswick, Bridgewater, Sayreville, North Brunswick, Carteret,
  Madison, Middlesex, Bound Brook, Manville, Chatham, Matawan,
  Mendham, High Bridge, Clinton and Peapack And Gladstone.

This includes the following highways...
 New Jersey Turnpike between exits 10 and 13.
 Interstate 78 in New Jersey between mile markers 12 and 42.
 Interstate 287 in New Jersey between mile markers 0 and 34.
 Garden State Parkway between mile markers 121 and 134.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Protecting yourself from immediate threats to life and safety shall
take priority.  Whenever possible, as long as it does not cause
greater harm, all COVID-19 protective action guidance should be
followed.

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 4056 7421 4055 7425 4050 7426 4050 7428
      4047 7427 4045 7422 4040 7426 4049 7471
      4062 7507 4079 7455 4074 7437 4067 7446
      4066 7445 4066 7440 4060 7446 4060 7421
TIME...MOT...LOC 0618Z 248DEG 24KT 4062 7471 4047 7424 

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

Staarmann

2 follow-up statements

796 
WWUS51 KPHI 240638
SVSPHI

Severe Weather Statement
National Weather Service Mount Holly NJ
238 AM EDT Fri Jul 24 2020

NJC019-240648-
/O.CAN.KPHI.SV.W.0184.000000T0000Z-200724T0700Z/
Hunterdon NJ-
238 AM EDT Fri Jul 24 2020

...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN HUNTERDON COUNTY
IS CANCELLED...

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

LAT...LON 4055 7425 4050 7426 4049 7428 4056 7458
      4061 7471 4062 7471 4064 7473 4071 7472
      4079 7456 4074 7437 4067 7446 4066 7445
      4066 7440 4060 7446 4060 7421 4056 7421
TIME...MOT...LOC 0638Z 244DEG 18KT 4066 7468 4061 7451 4055 7430 

$$

NJC023-027-035-240700-
/O.CON.KPHI.SV.W.0184.000000T0000Z-200724T0700Z/
Morris NJ-Somerset NJ-Middlesex NJ-
238 AM EDT Fri Jul 24 2020

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 300 AM EDT
FOR SOUTHEASTERN MORRIS...NORTHERN SOMERSET AND NORTHEASTERN
MIDDLESEX COUNTIES...

At 238 AM EDT, severe thunderstorms were located along a line
extending from near Far Hills to near Martinsville to near Perth
Amboy, moving northeast at 20 mph.

HAZARD...60 mph wind gusts.

SOURCE...Radar indicated.

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

Locations impacted include...
Perth Amboy, Somerville, Edison, Bridgewater, Carteret, Madison,
Middlesex, Bound Brook, Chatham, Mendham, Peapack And Gladstone, Far
Hills, Colonia, Martinsville, Millington, Society Hill, Basking
Ridge, Woodbridge, South Plainfield and North Plainfield.

This includes the following highways...
 New Jersey Turnpike between exits 11 and 13.
 Interstate 78 in New Jersey between mile markers 27 and 42.
 Interstate 287 in New Jersey between mile markers 0 and 9, and
between mile markers 13 and 34.
 Garden State Parkway between mile markers 127 and 134.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Protecting yourself from immediate threats to life and safety shall
take priority.  Whenever possible, as long as it does not cause
greater harm, all COVID-19 protective action guidance should be
followed.

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 4055 7425 4050 7426 4049 7428 4056 7458
      4061 7471 4062 7471 4064 7473 4071 7472
      4079 7456 4074 7437 4067 7446 4066 7445
      4066 7440 4060 7446 4060 7421 4056 7421
TIME...MOT...LOC 0638Z 244DEG 18KT 4066 7468 4061 7451 4055 7430 

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

Staarmann

737 
WWUS51 KPHI 240651
SVSPHI

Severe Weather Statement
National Weather Service Mount Holly NJ
251 AM EDT Fri Jul 24 2020

NJC023-027-035-240701-
/O.EXP.KPHI.SV.W.0184.000000T0000Z-200724T0700Z/
Morris NJ-Somerset NJ-Middlesex NJ-
251 AM EDT Fri Jul 24 2020

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN MORRIS...NORTHERN
SOMERSET AND NORTHEASTERN MIDDLESEX COUNTIES WILL EXPIRE AT 300 AM
EDT...
            
The storms which prompted the warning have weakened below severe
limits, and no longer pose 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 these thunderstorms.

LAT...LON 4055 7425 4050 7426 4049 7428 4056 7458
      4061 7471 4062 7471 4064 7473 4071 7472
      4079 7456 4074 7437 4067 7446 4066 7445
      4066 7440 4060 7446 4060 7421 4056 7421
TIME...MOT...LOC 0651Z 248DEG 24KT 4069 7459 4064 7442 4058 7421 

$$

Staarmann

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 23, 8:04 PM EDT	Severe Thunderstorm Warning	PHI	Middlesex, Monmouth	26 min
Jul 23, 11:16 PM EDT	Severe Thunderstorm Warning	PHI	Gloucester, Salem	44 min
Jul 23, 11:27 PM EDT	Special Marine Warning	PHI		63 min
Jul 24, 12:14 AM EDT	Special Weather Statement	PHI	Middlesex	31 min
Jul 24, 12:23 AM EDT	Severe Thunderstorm Warning	PHI	Mercer, Middlesex, Monmouth, Somerset	52 min
Jul 24, 12:31 AM EDT	Areal Flood Advisory	PHI	Hunterdon, Mercer, Middlesex, Monmouth, Somerset	119 min
Jul 24, 12:51 AM EDT	Special Marine Warning	PHI		54 min
Jul 24, 1:13 AM EDT	Severe Thunderstorm Warning	PHI	Hunterdon, Mercer, Middlesex, Monmouth, Somerset	62 min
Jul 24, 1:28 AM EDT	Flash Flood Warning	PHI	Mercer, Middlesex, Monmouth, Somerset	4 hr
Jul 24, 1:36 AM EDT	Special Marine Warning	PHI		84 min
Jul 24, 5:04 AM EDT	Special Marine Warning	PHI		56 min
Jul 24, 10:43 AM EDT	Flash Flood Warning	PHI	Camden	76 min
Jul 24, 11:42 AM EDT	Special Marine Warning	PHI		63 min
Jul 24, 12:43 PM EDT	Areal Flood Advisory	PHI	Ocean	3 hr
Jul 24, 1:09 PM EDT	Areal Flood Advisory	PHI	Monmouth, Ocean	110 min
Jul 24, 1:40 PM EDT	Special Weather Statement	PHI	Atlantic	35 min
Jul 24, 1:43 PM EDT	Areal Flood Advisory	PHI	Burlington, Mercer, Monmouth	3 hr
Jul 24, 2:02 PM EDT	Areal Flood Advisory	PHI	Atlantic, Burlington, Camden, Gloucester	3 hr
Jul 24, 2:19 PM EDT	Areal Flood Advisory	PHI	Burlington, Camden, Gloucester	2 hr
Jul 24, 2:26 PM EDT	Flash Flood Warning	PHI	Burlington	2 hr
Jul 24, 2:39 PM EDT	Areal Flood Advisory	PHI	Burlington, Ocean	3 hr
Jul 24, 2:42 PM EDT	Areal Flood Advisory	PHI	Burlington, Ocean	2 hr
Jul 24, 3:34 PM EDT	Flash Flood Warning	PHI	Atlantic, Burlington, Ocean	2 hr
Jul 24, 4:22 PM EDT	Areal Flood Advisory	PHI	Atlantic, Cape May	3 hr
Jul 24, 4:58 PM EDT	Areal Flood Advisory	PHI	Cape May	2 hr

Nearby

Severe Thunderstorm Warnings in New Jersey, 2020 Every severe thunderstorm warning in 2020

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.