Alert archive / New Jersey / Severe Thunderstorm Warnings in 2020

Severe Thunderstorm Warning 83, NWS Philadelphia/Mount Holly

June 28, 2020Morris County, Sussex County, Warren County, New Jersey; Northampton County, Pennsylvania

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Jun 28, 2020, 2:02 PM EDT for Morris County, Sussex County, Warren County, New Jersey; Northampton County, Pennsylvania. It was in force for 13 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued: Jun 28, 2020, 2:02 PM EDT (18:02 UTC)
Expired: Jun 28, 2020, 2:15 PM EDT
In force: 13 min
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

Counties Morris County, NJ, Sussex County, NJ, Warren County, NJ, Northampton County, PA

The radar

The Philadelphia radar (KDIX), 113 km from the middle of the area, began a volume at 18:05 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.

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, 6.0 hours before the alert went out and 172 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.

696 
WUUS51 KPHI 281802
SVRPHI
NJC027-037-041-PAC095-281830-
/O.NEW.KPHI.SV.W.0083.200628T1802Z-200628T1830Z/

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

The National Weather Service in Mount Holly NJ has issued a

* Severe Thunderstorm Warning for...
  Southwestern Morris County in northern New Jersey...
  South central Sussex County in northwestern New Jersey...
  Central Warren County in northwestern New Jersey...
  Northeastern Northampton County in eastern Pennsylvania...

* Until 230 PM EDT.

* At 201 PM EDT, a severe thunderstorm was located near Columbia, or
  17 miles northeast of Easton, moving east at 25 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...
  Hopatcong, Hackettstown, Blairstown, Mount Arlington, Stanhope,
  Netcong, Belvidere, Oxford, Hope, Chester, Delaware Water Gap,
  Andover, Great Meadows-Vienna, Allamuchy-Panther Valley,
  Succasunna, Succasunna-Kenvil, Greendell, Long Valley, Columbia and
  Budd Lake.

This includes Interstate 80 in New Jersey between mile markers 2 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.

Torrential rainfall is occurring with this storm, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.

&&

LAT...LON 4098 7462 4074 7467 4078 7485 4078 7491
      4081 7516 4095 7514 4097 7512 4099 7513
TIME...MOT...LOC 1801Z 278DEG 23KT 4089 7504 

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

Fitzsimmons

1 follow-up statement

504 
WWUS51 KPHI 281815
SVSPHI

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

NJC027-037-041-PAC095-281824-
/O.CAN.KPHI.SV.W.0083.000000T0000Z-200628T1830Z/
Morris NJ-Sussex NJ-Warren NJ-Northampton PA-
215 PM EDT Sun Jun 28 2020

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHWESTERN MORRIS...SOUTH
CENTRAL SUSSEX...CENTRAL WARREN AND NORTHEASTERN NORTHAMPTON 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 and northwestern New Jersey...and eastern and northeastern
Pennsylvania.

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 4098 7462 4074 7467 4078 7485 4078 7491
      4081 7516 4095 7514 4097 7512 4099 7513
TIME...MOT...LOC 1812Z 278DEG 23KT 4088 7492 

$$

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, 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, 6:15 PM EDT	Severe Thunderstorm Warning	PHI	Morris	30 min
Jun 28, 7:58 PM EDT	Special Marine Warning	PHI		62 min
Jun 28, 4:28 PM EDT	Special Weather Statement	PHI	Lehigh	32 min
Jun 28, 5:06 PM EDT	Special Weather Statement	PHI	Lehigh	24 min
Jun 28, 5:09 PM EDT	Severe Thunderstorm Warning	PHI	Chester, Delaware	36 min
Jun 28, 5:56 PM EDT	Special Weather Statement	PHI	Berks	34 min

Nearby

Severe Thunderstorm Warnings in New Jersey, 2020 Severe Thunderstorm Warnings in Pennsylvania, 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.