Alert archive / New Jersey / Severe Thunderstorm Warnings in 2020

Severe Thunderstorm Warning 161, NWS Philadelphia/Mount Holly

July 22, 2020Hunterdon County, Morris County, Somerset County, New Jersey

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Jul 22, 2020, 4:56 PM EDT for Hunterdon County, Morris County, Somerset County, New Jersey. It was in force for 49 min. 1 report 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, 4:56 PM EDT (20:56 UTC)
Expired: Jul 22, 2020, 5:45 PM EDT
In force: 49 min
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

Counties Hunterdon County, NJ, Morris County, NJ, Somerset County, NJ

The radar

The Philadelphia radar (KDIX), 81 km from the middle of the area, began a volume at 20:59 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, 5:16 PM EDT	TSTM WND DMG	2 Sw Peapack And Gladst, NJ	DOWNED TREES AND WIRES NEAR LARGER CROSS ROAD. 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, 8.9 hours before the alert went out and 159 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.

581 
WUUS51 KPHI 222056
SVRPHI
NJC019-027-035-222145-
/O.NEW.KPHI.SV.W.0161.200722T2056Z-200722T2145Z/

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

The National Weather Service in Mount Holly NJ has issued a

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

* Until 545 PM EDT.

* At 456 PM EDT, a severe thunderstorm was located over White House
  Station, or 10 miles west of Somerville, moving northeast 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...
  Bridgewater, Mendham, High Bridge, Clinton, Peapack And Gladstone,
  Chester, Lebanon, Califon, Far Hills, Long Valley, Annandale,
  Millington, White House Station, Basking Ridge, Succasunna-Kenvil,
  Bernardsville and Raritan.

This includes the following highways...
 Interstate 78 in New Jersey between mile markers 16 and 38.
 Interstate 287 in New Jersey between mile markers 17 and 30.

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.

&&

LAT...LON 4050 7477 4063 7494 4087 7470 4068 7445
TIME...MOT...LOC 2056Z 225DEG 10KT 4062 7479 

HAIL...1.00IN
WIND...60MPH
 
$$

Meola

2 follow-up statements

155 
WWUS51 KPHI 222118
SVSPHI

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

NJC019-027-035-222145-
/O.CON.KPHI.SV.W.0161.000000T0000Z-200722T2145Z/
Morris NJ-Hunterdon NJ-Somerset NJ-
518 PM EDT Wed Jul 22 2020

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 545 PM EDT
FOR SOUTHWESTERN MORRIS...NORTHEASTERN HUNTERDON AND NORTHERN
SOMERSET COUNTIES...

At 517 PM EDT, a severe thunderstorm was located near White House
Station, or 9 miles northwest of Somerville, moving northeast at 10
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...
Bridgewater, Mendham, Peapack And Gladstone, Chester, Califon, Far
Hills, Millington, Basking Ridge, Long Valley, Succasunna-Kenvil,
Bernardsville and Raritan.

This includes the following highways...
 Interstate 78 in New Jersey between mile markers 24 and 38.
 Interstate 287 in New Jersey between mile markers 18 and 30.

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.

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 4055 7469 4071 7484 4087 7470 4068 7445
TIME...MOT...LOC 2117Z 225DEG 10KT 4066 7473 

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

Meola

446 
WWUS51 KPHI 222136
SVSPHI

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

NJC019-027-035-222145-
/O.EXP.KPHI.SV.W.0161.000000T0000Z-200722T2145Z/
Morris NJ-Hunterdon NJ-Somerset NJ-
536 PM EDT Wed Jul 22 2020

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHWESTERN MORRIS...
NORTHEASTERN HUNTERDON AND NORTHERN SOMERSET COUNTIES WILL EXPIRE AT
545 PM EDT...
    
The severe thunderstorm which prompted the warning has weakened. 
Therefore, the warning will be allowed to expire.

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

LAT...LON 4055 7469 4071 7484 4087 7470 4068 7445
TIME...MOT...LOC 2135Z 225DEG 10KT 4070 7468 

$$

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, 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, 6:04 PM EDT	Severe Thunderstorm Warning	PHI	Hunterdon, Middlesex, Morris, Somerset, Sussex, Warren	60 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.