Alert archive / New Jersey / Severe Thunderstorm Warnings in 2020

Severe Thunderstorm Warning 85, NWS Philadelphia/Mount Holly

June 28, 2020Morris County, Somerset County, New Jersey

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Jun 28, 2020, 3:41 PM EDT for Morris County, Somerset County, New Jersey. It was in force for 36 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: Jun 28, 2020, 3:41 PM EDT (19:41 UTC)
Expired: Jun 28, 2020, 4:17 PM EDT
In force: 36 min
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon
Hail: 1.25 in
Wind: 60.0 mph

Counties Morris County, NJ, Somerset County, NJ

The radar

The Philadelphia radar (KDIX), 95 km from the middle of the area, began a volume at 19:44 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
Jun 28, 3:55 PM EDT	HAIL 0.7	3 Nw Mendham, NJ

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
Jun 28, 1:32 PM EDT	Severe Thunderstorm Watch	SPC	6 hr

The nearest sounding before it

Brookhaven, NY (KOKX), launched 12:00Z, 7.7 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: 1270 J/kg
Mixed-layer CIN: -43 J/kg
Mixed-layer LCL: 797 m above ground
0-6 km bulk shear: 26 kt
0-1 km storm-relative helicity: 42 m²/s²
0-3 km storm-relative helicity: 128 m²/s²
Significant tornado parameter: 0.4
Supercell composite: 2.8

Open this sounding in Storm Lab

The text

As transmitted.

222 
WUUS51 KPHI 281941
SVRPHI
NJC027-035-282030-
/O.NEW.KPHI.SV.W.0085.200628T1941Z-200628T2030Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Mount Holly NJ
341 PM EDT Sun Jun 28 2020

The National Weather Service in Mount Holly NJ has issued a

* Severe Thunderstorm Warning for...
  Southern Morris County in northern New Jersey...
  North central Somerset County in northern New Jersey...

* Until 430 PM EDT.

* At 341 PM EDT, a severe thunderstorm was located over Chester, or
  10 miles west of Morristown, moving east at 20 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...
  Morristown, Dover, Madison, Florham Park, East Hanover, Chatham,
  Rockaway, Morris Plains, Mendham, Mountain Lakes, Peapack And
  Gladstone, Chester, Victory Gardens, Succasunna, Succasunna-Kenvil,
  Parsippany, Long Valley, Budd Lake, Bernardsville and Hanover
  Township.

This includes the following highways...
 Interstate 80 in New Jersey between mile markers 40 and 48.
 Interstate 287 in New Jersey between mile markers 30 and 43.

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 this storm, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.

&&

LAT...LON 4082 7434 4079 7437 4076 7437 4075 7436
      4074 7437 4071 7441 4075 7479 4088 7476
      4089 7434 4086 7432
TIME...MOT...LOC 1941Z 280DEG 16KT 4081 7469 

HAIL...1.25IN
WIND...60MPH
 
$$

JEO

3 follow-up statements

631 
WWUS51 KPHI 281953
SVSPHI

Severe Weather Statement
National Weather Service Mount Holly NJ
353 PM EDT Sun Jun 28 2020

NJC027-035-282030-
/O.CON.KPHI.SV.W.0085.000000T0000Z-200628T2030Z/
Morris NJ-Somerset NJ-
353 PM EDT Sun Jun 28 2020

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 430 PM EDT
FOR SOUTHEASTERN MORRIS AND NORTH CENTRAL SOMERSET COUNTIES...

At 353 PM EDT, a severe thunderstorm was located over Mendham, or 7
miles west of Morristown, moving east at 20 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...
Morristown, Madison, Florham Park, East Hanover, Chatham, Morris
Plains, Mendham, Mountain Lakes, Peapack And Gladstone, Chester,
Victory Gardens, Succasunna, Succasunna-Kenvil, Parsippany, Budd
Lake, Bernardsville and Hanover Township.

This includes the following highways...
 Interstate 80 in New Jersey between mile markers 41 and 48.
 Interstate 287 in New Jersey between mile markers 30 and 43.

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 this storm, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.

&&

LAT...LON 4082 7434 4079 7437 4076 7437 4075 7436
      4074 7437 4071 7441 4075 7473 4086 7473
      4089 7434 4086 7432
TIME...MOT...LOC 1953Z 280DEG 16KT 4080 7462 

HAIL...1.25IN
WIND...60MPH
 
$$

JEO

416 
WWUS51 KPHI 282008
SVSPHI

Severe Weather Statement
National Weather Service Mount Holly NJ
408 PM EDT Sun Jun 28 2020

NJC027-035-282030-
/O.CON.KPHI.SV.W.0085.000000T0000Z-200628T2030Z/
Morris NJ-Somerset NJ-
408 PM EDT Sun Jun 28 2020

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 430 PM EDT
FOR SOUTHEASTERN MORRIS AND NORTH CENTRAL SOMERSET COUNTIES...

At 408 PM EDT, a severe thunderstorm was located over Morristown,
moving east at 20 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...
Morristown, Madison, Florham Park, East Hanover, Chatham, Mendham,
Peapack And Gladstone, Chester, Bernardsville and Hanover Township.

This includes Interstate 287 in New Jersey between mile markers 30
and 38.
 
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 this storm, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.

&&

LAT...LON 4079 7437 4076 7437 4075 7436 4074 7437
      4071 7441 4074 7468 4081 7467 4083 7434
      4082 7434
TIME...MOT...LOC 2008Z 280DEG 16KT 4079 7453 

HAIL...1.25IN
WIND...60MPH
 
$$

JEO

825 
WWUS51 KPHI 282017
SVSPHI

Severe Weather Statement
National Weather Service Mount Holly NJ
417 PM EDT Sun Jun 28 2020

NJC027-035-282027-
/O.CAN.KPHI.SV.W.0085.000000T0000Z-200628T2030Z/
Morris NJ-Somerset NJ-
417 PM EDT Sun Jun 28 2020

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN MORRIS AND NORTH
CENTRAL SOMERSET COUNTIES IS CANCELLED...
                
The storm which prompted the warning has weakened below severe
limits, and no longer poses an immediate threat to life or property.
Therefore, the warning has been cancelled.  However gusty winds are
still possible with this thunderstorm.

A Severe Thunderstorm Watch remains in effect until 800 PM EDT for
northern New Jersey.

LAT...LON 4079 7437 4076 7437 4075 7436 4074 7437
      4071 7441 4074 7468 4081 7467 4083 7434
      4082 7434
TIME...MOT...LOC 2016Z 280DEG 16KT 4078 7448 

$$

JEO

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 28, 1:15 PM EDT	Special Weather Statement	PHI	Sussex	30 min
Jun 28, 1:22 PM EDT	Severe Thunderstorm Warning	PHI	Sussex	38 min
Jun 28, 2:02 PM EDT	Severe Thunderstorm Warning	PHI	Morris, Sussex, Warren	13 min
Jun 28, 3:20 PM EDT	Severe Thunderstorm Warning	PHI	Warren	40 min
Jun 28, 5:06 PM EDT	Severe Thunderstorm Warning	PHI	Morris, Sussex	39 min
Jun 28, 5:14 PM EDT	Severe Thunderstorm Warning	PHI	Hunterdon, Morris, Warren	46 min
Jun 28, 5:48 PM EDT	Severe Thunderstorm Warning	PHI	Morris	27 min
Jun 28, 5:49 PM EDT	Severe Thunderstorm Warning	PHI	Hunterdon, Middlesex, Somerset	15 min
Jun 28, 5:59 PM EDT	Special Marine Warning	PHI		61 min
Jun 28, 6:15 PM EDT	Severe Thunderstorm Warning	PHI	Morris	30 min
Jun 28, 7:58 PM EDT	Special Marine Warning	PHI		62 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.