Alert archive / New Jersey / Severe Thunderstorm Warnings in 2020

Severe Thunderstorm Warning 90, NWS Philadelphia/Mount Holly

June 28, 2020Hunterdon County, Middlesex County, Somerset County, New Jersey

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Jun 28, 2020, 5:49 PM EDT for Hunterdon County, Middlesex County, Somerset County, New Jersey. It was in force for 15 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, 5:49 PM EDT (21:49 UTC)
Expired: Jun 28, 2020, 6:04 PM EDT
In force: 15 min
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon
Hail: 1.25 in
Wind: 60.0 mph

Counties Hunterdon County, NJ, Middlesex County, NJ, Somerset County, NJ

The radar

The Philadelphia radar (KDIX), 71 km from the middle of the area, began a volume at 21:52 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, 9.8 hours before the alert went out and 134 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.

139 
WUUS51 KPHI 282149
SVRPHI
NJC019-023-035-282230-
/O.NEW.KPHI.SV.W.0090.200628T2149Z-200628T2230Z/

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

The National Weather Service in Mount Holly NJ has issued a

* Severe Thunderstorm Warning for...
  Northeastern Hunterdon County in northwestern New Jersey...
  Central Somerset County in northern New Jersey...
  Northeastern Middlesex County in northern New Jersey...

* Until 630 PM EDT.

* At 549 PM EDT, a severe thunderstorm was located over Lebanon, or
  12 miles northwest of Somerville, moving southeast at 40 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...
  New Brunswick, Perth Amboy, Somerville, Somerset, Edison, Old
  Bridge, East Brunswick, Bridgewater, Sayreville, North Brunswick,
  Carteret, Middlesex, Bound Brook, Manville, High Bridge, Peapack
  And Gladstone, Lebanon, Califon, Far Hills and Millstone.

This includes the following highways...
 New Jersey Turnpike between exits 10 and 12.
 Interstate 78 in New Jersey between mile markers 19 and 41.
 Interstate 287 in New Jersey between mile markers 0 and 25.
 Garden State Parkway between mile markers 123 and 134.

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 4055 7425 4050 7426 4050 7428 4046 7425
      4038 7435 4067 7494 4075 7490 4067 7452
      4065 7452 4067 7449 4066 7445 4063 7442
      4060 7446 4061 7433 4059 7429 4059 7421
      4056 7421
TIME...MOT...LOC 2149Z 296DEG 35KT 4067 7481 

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

JEO

1 follow-up statement

284 
WWUS51 KPHI 282204 RRA
SVSPHI

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

NJC019-023-035-282214-
/O.CAN.KPHI.SV.W.0090.000000T0000Z-200628T2230Z/
Hunterdon NJ-Somerset NJ-Middlesex NJ-
604 PM EDT Sun Jun 28 2020

...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN HUNTERDON...
CENTRAL SOMERSET AND NORTHEASTERN MIDDLESEX 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.

LAT...LON 4055 7425 4050 7426 4050 7428 4046 7425
      4038 7435 4067 7494 4075 7490 4067 7452
      4065 7452 4067 7449 4066 7445 4063 7442
      4060 7446 4061 7433 4059 7429 4059 7421
      4056 7421
TIME...MOT...LOC 2203Z 296DEG 35KT 4060 7463 

$$

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, 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, 5:59 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.