Alert archive / New Jersey / Severe Thunderstorm Warnings in 2020

Severe Thunderstorm Warning 91, NWS Philadelphia/Mount Holly

June 28, 2020Morris County, New Jersey

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Jun 28, 2020, 6:15 PM EDT for Morris County, New Jersey. It was in force for 30 min. 5 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: Jun 28, 2020, 6:15 PM EDT (22:15 UTC)
Expired: Jun 28, 2020, 6:45 PM EDT
In force: 30 min
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

County Morris County, NJ

The radar

The Philadelphia radar (KDIX), 107 km from the middle of the area, began a volume at 22:15 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, 6:20 PM EDT	HAIL 0.88	1 Wsw Mountain Lakes, NJ
Jun 28, 6:23 PM EDT	TSTM WND DMG	Mountain Lakes, NJ	DOWNED POWER LINES IN THE AREA OF CRANE ROAD. TIME ESTIMATED FROM RADAR.
Jun 28, 6:26 PM EDT	TSTM WND DMG	Lake Hiawatha, NJ	CORRECTS PREVIOUS TSTM WND DMG REPORT FROM LAKE HIAWATHA. WIDESPREAD POWER OUTAGES REPORTED. TIME ESTIMATED FROM RADAR.
Jun 28, 6:26 PM EDT	TSTM WND DMG	Troy Hills, NJ	WIDESPREAD POWER OUTAGES REPORTED. TIME ESTIMATED FROM RADAR.
Jun 28, 6:30 PM EDT	TSTM WND DMG	1 Ssw Pine Brook, NJ	DOWNED TREE ON INTERSTATE 280 WESTBOUND RAMP EXIT 1W. RAMP CLOSED. 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
Jun 28, 1:32 PM EDT	Severe Thunderstorm Watch	SPC	6 hr

The nearest sounding before it

Brookhaven, NY (KOKX), launched 12:00Z, 10.3 hours before the alert went out and 129 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.

023 
WUUS51 KPHI 282215
SVRPHI
NJC027-282245-
/O.NEW.KPHI.SV.W.0091.200628T2215Z-200628T2245Z/

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

The National Weather Service in Mount Holly NJ has issued a

* Severe Thunderstorm Warning for...
  Morris County in northern New Jersey...

* Until 645 PM EDT.

* At 615 PM EDT, a severe thunderstorm was located over Boonton, or 7
  miles northwest of Caldwell, moving southeast at 20 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...
  Morristown, Dover, Madison, Florham Park, East Hanover, Lincoln
  Park, Kinnelon, Chatham, Boonton, Butler, Wharton, Rockaway, Morris
  Plains, Mount Arlington, Mendham, Mountain Lakes, Riverdale,
  Victory Gardens, Green Pond and Parsippany.

This includes the following highways...
 Interstate 80 in New Jersey between mile markers 30 and 48.
 Interstate 287 in New Jersey between mile markers 31 and 54.

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 4090 7427 4091 7433 4088 7434 4086 7432
      4079 7437 4073 7437 4068 7447 4079 7460
      4091 7467 4105 7451 4104 7450 4105 7444
      4102 7443 4100 7430 4097 7428 4092 7429
TIME...MOT...LOC 2215Z 314DEG 17KT 4090 7439 

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

Fitzsimmons

2 follow-up statements

885 
WWUS51 KPHI 282225
SVSPHI

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

NJC027-282245-
/O.CON.KPHI.SV.W.0091.000000T0000Z-200628T2245Z/
Morris NJ-
625 PM EDT Sun Jun 28 2020

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 645 PM EDT
FOR EASTERN MORRIS COUNTY...

At 624 PM EDT, a severe thunderstorm was located over Parsippany, or
near Morristown, moving southeast at 15 mph.

HAZARD...60 mph wind gusts and quarter size hail.

SOURCE...Radar indicated. There has also been a report of downed 
         power lines in Lincoln Park. 

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, Lincoln Park,
Kinnelon, Chatham, Boonton, Butler, Wharton, Rockaway, Morris Plains,
Mendham, Mountain Lakes, Riverdale, Victory Gardens, Parsippany,
Pequannock Township and Succasunna-Kenvil.

This includes the following highways...
 Interstate 80 in New Jersey between mile markers 34 and 48.
 Interstate 287 in New Jersey between mile markers 31 and 54.

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 4087 7465 4101 7438 4100 7430 4097 7428
      4092 7429 4090 7427 4091 7433 4088 7434
      4086 7432 4079 7437 4073 7437 4068 7447
      4079 7459 4082 7462
TIME...MOT...LOC 2224Z 326DEG 14KT 4087 7441 

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

Fitzsimmons

180 
WWUS51 KPHI 282242
SVSPHI

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

NJC027-282252-
/O.EXP.KPHI.SV.W.0091.000000T0000Z-200628T2245Z/
Morris NJ-
642 PM EDT Sun Jun 28 2020

...THE SEVERE THUNDERSTORM WARNING FOR EASTERN MORRIS COUNTY WILL
EXPIRE AT 645 PM EDT...
        
The storm which prompted the warning has moved out of the area.
Therefore, the warning will be allowed to expire.

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

To report severe weather, contact your nearest law enforcement
agency. They will relay your report to the National Weather Service
Mount Holly NJ.

LAT...LON 4087 7465 4101 7438 4100 7430 4097 7428
      4092 7429 4090 7427 4091 7433 4088 7434
      4086 7432 4079 7437 4073 7437 4068 7447
      4079 7459 4082 7462
TIME...MOT...LOC 2242Z 314DEG 17KT 4082 7435 

$$

Fitzsimmons

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, 3:41 PM EDT	Severe Thunderstorm Warning	PHI	Morris, Somerset	36 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, 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.