Alert archive / New Jersey / Severe Thunderstorm Warnings in 2020

Severe Thunderstorm Warning 169, NWS Philadelphia/Mount Holly

July 22, 20206 counties in New Jersey

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Jul 22, 2020, 6:04 PM EDT for 6 counties in New Jersey. It was in force for 60 min. 8 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 22, 2020, 6:04 PM EDT (22:04 UTC)
Expired: Jul 22, 2020, 7:04 PM EDT
In force: 60 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), 86 km from the middle of the area, began a volume at 22:08 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
Jul 22, 6:21 PM EDT	TSTM WND DMG	2 Nw Mendham, NJ	DOWNED TREE AND WIRES NEAR IRONIA ROAD NEAR MENDHAM. TIME ESTIMATED FROM RADAR.
Jul 22, 6:21 PM EDT	TSTM WND DMG	Dunellen, NJ	SEVERAL REPORTS OF TREES AND WIRES DOWN IN THE DUNELLEN AREA. TIME ESTIMATED FROM RADAR.
Jul 22, 6:23 PM EDT	TSTM WND DMG	1 Sw Iselin, NJ	DOWNED POWER POLE AND WIRES ON STATE HIGHWAY 27 SOUTH OF ISELIN RAILROAD STATION IN WOODBRIDGE TWP. TIME ESTIMATED FROM RADAR.
Jul 22, 6:28 PM EDT	TSTM WND DMG	South Bound Brook, NJ	SEVERAL REPORTS OF WIRES DOWN IN BOUND BROOK AND SOUTH BOUND BROOK. TIME ESTIMATED FROM RADAR.
Jul 22, 6:30 PM EDT	HAIL 1	South Plainfield, NJ	QUARTER SIZE HAIL REPORTED IN SOUTH PLAINFIELD. PHOTOS VIA SOCIAL MEDIA.
Jul 22, 6:31 PM EDT	TSTM WND DMG	2 W New Vernon, NJ	DOWNED TREES AND WIRES NEAR BAILEYS MILL ROAD IN NEW VERNON. TIME ESTIMATED FROM RADAR.
Jul 22, 6:35 PM EDT	TSTM WND DMG	South Plainfield, NJ	TRESS AND WIRES REPORTED DOWN IN SOUTH PLAINFIELD.
Jul 22, 6:36 PM EDT	TSTM WND DMG	1 Ne Lyons, NJ	WIRES DOWN ON CARTER STREET IN BASKING RIDGE. 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
Jul 22, 2:57 PM EDT	Severe Thunderstorm Watch	SPC	7 hr

The nearest sounding before it

Brookhaven, NY (KOKX), launched 12:00Z, 10.1 hours before the alert went out and 130 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: 15 J/kg
Mixed-layer CIN: -173 J/kg
Mixed-layer LCL: 1410 m above ground
0-6 km bulk shear: 23 kt
0-1 km storm-relative helicity: 111 m²/s²
0-3 km storm-relative helicity: 183 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.5

Open this sounding in Storm Lab

The text

As transmitted.

018 
WUUS51 KPHI 222204
SVRPHI
NJC019-023-027-035-037-041-222315-
/O.NEW.KPHI.SV.W.0169.200722T2204Z-200722T2315Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Mount Holly NJ
604 PM EDT Wed Jul 22 2020

The National Weather Service in Mount Holly NJ has issued a

* Severe Thunderstorm Warning for...
  Morris County in northern New Jersey...
  Northeastern Hunterdon County in northwestern New Jersey...
  Southwestern Sussex County in northwestern New Jersey...
  Eastern Warren County in northwestern New Jersey...
  Somerset County in northern New Jersey...
  Northeastern Middlesex County in northern New Jersey...

* Until 715 PM EDT.

* At 604 PM EDT, severe thunderstorms were located along a line
  extending from near Andover to near Clinton, moving east at 25 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...
  Perth Amboy, Morristown, Somerville, Somerset, Edison, Bridgewater,
  Carteret, Dover, Madison, Hopatcong, Middlesex, Florham Park, East
  Hanover, Lincoln Park, Bound Brook, Manville, Hackettstown,
  Chatham, Boonton and Wharton.

This includes the following highways...
 New Jersey Turnpike between exits 11 and 13.
 Interstate 78 in New Jersey between mile markers 11 and 42.
 Interstate 80 in New Jersey between mile markers 13 and 48.
 Interstate 287 in New Jersey between mile markers 0 and 52.
 Garden State Parkway between mile markers 129 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.

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.

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 4052 7425 4051 7505
      4104 7492 4097 7428 4092 7429 4090 7427
      4091 7433 4083 7433 4076 7438 4075 7436
      4067 7446 4066 7445 4066 7441 4065 7440
      4060 7446 4060 7421
TIME...MOT...LOC 2204Z 270DEG 22KT 4095 7472 4060 7489 

HAIL...0.75IN
WIND...60MPH
 
$$

Meola

2 follow-up statements

085 
WWUS51 KPHI 222233
SVSPHI

Severe Weather Statement
National Weather Service Mount Holly NJ
633 PM EDT Wed Jul 22 2020

NJC037-041-222242-
/O.CAN.KPHI.SV.W.0169.000000T0000Z-200722T2315Z/
Sussex NJ-Warren NJ-
633 PM EDT Wed Jul 22 2020

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHWESTERN SUSSEX AND
EASTERN WARREN COUNTIES IS CANCELLED...

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

A Severe Thunderstorm Watch remains in effect until 1000 PM EDT for
northern and northwestern New Jersey.

LAT...LON 4056 7421 4055 7425 4052 7425 4051 7478
      4100 7455 4097 7428 4092 7429 4090 7427
      4091 7433 4083 7433 4076 7438 4075 7436
      4067 7446 4066 7445 4066 7441 4065 7440
      4060 7446 4060 7421
TIME...MOT...LOC 2232Z 270DEG 22KT 4095 7450 4060 7467 

$$

NJC019-023-027-035-222315-
/O.CON.KPHI.SV.W.0169.000000T0000Z-200722T2315Z/
Morris NJ-Hunterdon NJ-Somerset NJ-Middlesex NJ-
633 PM EDT Wed Jul 22 2020

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 715 PM EDT
FOR EASTERN MORRIS...EAST CENTRAL HUNTERDON...SOMERSET AND
NORTHEASTERN MIDDLESEX COUNTIES...

At 632 PM EDT, severe thunderstorms were located along a line
extending from Lake Telemark to Bridgewater, moving east at 25 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...
Perth Amboy, Morristown, Somerville, Somerset, Edison, Bridgewater,
Carteret, Dover, Madison, Middlesex, Florham Park, East Hanover,
Lincoln Park, Bound Brook, Manville, Chatham, Boonton, Wharton,
Rockaway and Morris Plains.

This includes the following highways...
 New Jersey Turnpike between exits 11 and 13.
 Interstate 78 in New Jersey between mile markers 28 and 42.
 Interstate 80 in New Jersey between mile markers 33 and 48.
 Interstate 287 in New Jersey between mile markers 0 and 52.
 Garden State Parkway between mile markers 128 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 4052 7425 4051 7478
      4100 7455 4097 7428 4092 7429 4090 7427
      4091 7433 4083 7433 4076 7438 4075 7436
      4067 7446 4066 7445 4066 7441 4065 7440
      4060 7446 4060 7421
TIME...MOT...LOC 2232Z 270DEG 22KT 4095 7450 4060 7467 

HAIL...0.75IN
WIND...60MPH
 
$$

Meola

754 
WWUS51 KPHI 222304
SVSPHI

Severe Weather Statement
National Weather Service Mount Holly NJ
704 PM EDT Wed Jul 22 2020

NJC019-023-027-035-222314-
/O.CAN.KPHI.SV.W.0169.000000T0000Z-200722T2315Z/
Morris NJ-Hunterdon NJ-Somerset NJ-Middlesex NJ-
704 PM EDT Wed Jul 22 2020

...THE SEVERE THUNDERSTORM WARNING FOR EASTERN MORRIS...EAST CENTRAL
HUNTERDON...SOMERSET AND NORTHEASTERN MIDDLESEX 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.

A Severe Thunderstorm Watch remains in effect until 1000 PM EDT for
northern and northwestern New Jersey.

LAT...LON 4056 7421 4055 7425 4052 7425 4051 7478
      4100 7455 4097 7428 4092 7429 4090 7427
      4091 7433 4083 7433 4076 7438 4075 7436
      4067 7446 4066 7445 4066 7441 4065 7440
      4060 7446 4060 7421
TIME...MOT...LOC 2302Z 270DEG 22KT 4095 7425 4060 7442 

$$

Meola

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 21, 10:57 PM EDT	Special Marine Warning	PHI		63 min
Jul 22, 2:10 PM EDT	Severe Thunderstorm Warning	PHI	Warren	50 min
Jul 22, 3:04 PM EDT	Severe Thunderstorm Warning	PHI	Sussex	30 min
Jul 22, 3:18 PM EDT	Special Weather Statement	PHI	Morris, Warren	42 min
Jul 22, 3:50 PM EDT	Severe Thunderstorm Warning	PHI	Hunterdon, Morris, Sussex, Warren	29 min
Jul 22, 4:33 PM EDT	Special Weather Statement	PHI	Morris	57 min
Jul 22, 4:56 PM EDT	Severe Thunderstorm Warning	PHI	Hunterdon, Morris, Somerset	49 min
Jul 22, 5:16 PM EDT	Severe Thunderstorm Warning	PHI	Hunterdon, Morris, Sussex, Warren	59 min
Jul 22, 5:23 PM EDT	Areal Flood Advisory	PHI	Warren	3 hr
Jul 22, 5:33 PM EDT	Severe Thunderstorm Warning	PHI	Gloucester	57 min
Jul 22, 5:40 PM EDT	Severe Thunderstorm Warning	PHI	Burlington, Hunterdon, Mercer, Somerset	65 min
Jul 22, 5:49 PM EDT	Special Marine Warning	PHI		86 min
Jul 22, 5:54 PM EDT	Severe Thunderstorm Warning	PHI	Gloucester, Salem	51 min
Jul 22, 6:12 PM EDT	Severe Thunderstorm Warning	PHI	Burlington, Camden, Gloucester, Salem	48 min
Jul 22, 6:17 PM EDT	Severe Thunderstorm Warning	PHI	Burlington, Mercer, Middlesex, Monmouth, Ocean, Somerset	52 min
Jul 22, 6:46 PM EDT	Severe Thunderstorm Warning	PHI	Atlantic, Camden, Cape May, Cumberland, Gloucester, Salem	44 min
Jul 22, 6:47 PM EDT	Special Marine Warning	PHI		28 min
Jul 22, 6:52 PM EDT	Areal Flood Advisory	PHI	Middlesex, Somerset	113 min
Jul 22, 6:52 PM EDT	Special Marine Warning	PHI		41 min
Jul 22, 7:20 PM EDT	Special Marine Warning	PHI		55 min
Jul 22, 7:23 PM EDT	Severe Thunderstorm Warning	PHI	Atlantic, Burlington, Camden, Cape May, Cumberland, Gloucester and 1 more	52 min
Jul 22, 7:58 PM EDT	Severe Thunderstorm Warning	PHI	Atlantic, Burlington, Camden, Ocean	47 min
Jul 22, 7:59 PM EDT	Special Marine Warning	PHI		61 min

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.