Alert archive / New Jersey / Severe Thunderstorm Warnings in 2020

Severe Thunderstorm Warning 88, NWS Philadelphia/Mount Holly

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

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Jun 28, 2020, 5:14 PM EDT for Hunterdon County, Morris County, Warren County, New Jersey; Northampton County, Pennsylvania. It was in force for 46 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, 5:14 PM EDT (21:14 UTC)
Expired: Jun 28, 2020, 6:00 PM EDT
In force: 46 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, Warren County, NJ, Northampton County, PA

The radar

The Philadelphia radar (KDIX), 117 km from the middle of the area, began a volume at 21:15 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.

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, 9.2 hours before the alert went out and 182 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.

742 
WUUS51 KPHI 282114
SVRPHI
NJC019-027-041-PAC095-282200-
/O.NEW.KPHI.SV.W.0088.200628T2114Z-200628T2200Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Mount Holly NJ
514 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...
  Northeastern Hunterdon County in northwestern New Jersey...
  Central Warren County in northwestern New Jersey...
  Northeastern Northampton County in eastern Pennsylvania...

* Until 600 PM EDT.

* At 514 PM EDT, a severe thunderstorm was located near East Bangor,
  or 14 miles north of Easton, moving east 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...
  Hackettstown, Washington, Bangor, High Bridge, Stanhope, Netcong,
  Belvidere, Oxford, Hope, Glen Gardner, Hampton, Lebanon, East
  Bangor, Califon, Delaware Water Gap, Brass Castle, Long Valley,
  Great Meadows-Vienna, Allamuchy-Panther Valley and Pleasant Valley.

This includes the following highways...
 Interstate 78 in New Jersey between mile markers 21 and 23.
 Interstate 80 in New Jersey between mile markers 2 and 26.

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 4091 7471 4063 7480 4081 7525 4094 7519
      4095 7518 4095 7515 4097 7512 4097 7510
TIME...MOT...LOC 2114Z 289DEG 16KT 4088 7512 

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

Fitzsimmons

1 follow-up statement

841 
WWUS51 KPHI 282133
SVSPHI

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

NJC019-027-041-PAC095-282200-
/O.CON.KPHI.SV.W.0088.000000T0000Z-200628T2200Z/
Morris NJ-Hunterdon NJ-Warren NJ-Northampton PA-
533 PM EDT Sun Jun 28 2020

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 600 PM EDT
FOR SOUTHWESTERN MORRIS...NORTHEASTERN HUNTERDON...CENTRAL WARREN AND
NORTHEASTERN NORTHAMPTON COUNTIES...

At 533 PM EDT, a severe thunderstorm was located over Belvidere, or
13 miles northeast of Easton, moving southeast at 20 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...
Hackettstown, Washington, High Bridge, Belvidere, Oxford, Hope, Glen
Gardner, Hampton, Lebanon, Califon, Great Meadows-Vienna, Brass
Castle, Allamuchy-Panther Valley, Pleasant Valley, Long Valley,
Roxburg, Columbia, Budd Lake, Beatyestown and Portland.

This includes the following highways...
 Interstate 78 in New Jersey between mile markers 21 and 22.
 Interstate 80 in New Jersey between mile markers 2 and 14.

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 4080 7523 4097 7511 4089 7472 4063 7480
TIME...MOT...LOC 2133Z 301DEG 16KT 4082 7504 

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

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, 5:48 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.