Alert archive / New Jersey / Severe Thunderstorm Warnings in 2020

Severe Thunderstorm Warning 82, NWS Philadelphia/Mount Holly

June 28, 2020Sussex County, New Jersey

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Jun 28, 2020, 1:22 PM EDT for Sussex County, New Jersey. It was in force for 38 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, 1:22 PM EDT (17:22 UTC)
Expired: Jun 28, 2020, 2:00 PM EDT
In force: 38 min
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

County Sussex County, NJ

The radar

The Philadelphia radar (KDIX), 146 km from the middle of the area, began a volume at 17:25 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, 1:31 PM EDT	HAIL 0.88	3 Nnw High Point, NJ	DIME TO NICKLE SIZE HAIL ON RIVER ROAD. TIME ESTIMATE FROM RADAR.

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The nearest sounding before it

Brookhaven, NY (KOKX), launched 12:00Z, 5.4 hours before the alert went out and 157 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.

209 
WUUS51 KPHI 281722
SVRPHI
NJC037-281800-
/O.NEW.KPHI.SV.W.0082.200628T1722Z-200628T1800Z/

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

The National Weather Service in Mount Holly NJ has issued a

* Severe Thunderstorm Warning for...
  Northern Sussex County in northwestern New Jersey...

* Until 200 PM EDT.

* At 122 PM EDT, a severe thunderstorm was located over Hainesville,
  or near Montague, 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...
  Montague, Franklin, Hamburg, Sussex, Branchville, High Point,
  Pellettown, Highland Lake, Vernon Valley, Hainesville and Crandon
  Lakes.

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.

&&

LAT...LON 4123 7442 4120 7437 4109 7450 4114 7492
      4121 7486 4123 7487 4128 7484 4135 7475
      4135 7472 4136 7470
TIME...MOT...LOC 1722Z 280DEG 16KT 4124 7478 

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

Fitzsimmons

2 follow-up statements

099 
WWUS51 KPHI 281732
SVSPHI

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

NJC037-281800-
/O.CON.KPHI.SV.W.0082.000000T0000Z-200628T1800Z/
Sussex NJ-
132 PM EDT Sun Jun 28 2020

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 200 PM EDT
FOR NORTHERN SUSSEX COUNTY...

At 132 PM EDT, a severe thunderstorm was located over High Point, or
near Matamoras, moving east at 20 mph.

HAZARD...Ping pong ball size hail and 60 mph wind gusts.

SOURCE...Radar indicated.

IMPACT...People and animals outdoors will be injured. Expect hail 
         damage to roofs, siding, windows, and vehicles. Wind damage 
         to roofs, siding, trees, and power lines is possible.

Locations impacted include...
Montague, Franklin, Hamburg, Sussex, Branchville, High Point,
Pellettown, Highland Lake, Vernon Valley, Hainesville and Crandon
Lakes.

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.

Prepare immediately for large hail and deadly cloud to ground
lightning. Seek shelter inside a well-built structure. Stay away from
windows.

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

&&

LAT...LON 4123 7442 4120 7437 4109 7450 4114 7492
      4121 7486 4123 7487 4128 7484 4135 7475
      4135 7472 4136 7470
TIME...MOT...LOC 1732Z 284DEG 19KT 4132 7465 

HAIL...1.50IN
WIND...60MPH
 
$$

Fitzsimmons

997 
WWUS51 KPHI 281752
SVSPHI

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

NJC037-281801-
/O.EXP.KPHI.SV.W.0082.000000T0000Z-200628T1800Z/
Sussex NJ-
152 PM EDT Sun Jun 28 2020

...THE SEVERE THUNDERSTORM WARNING FOR NORTHERN SUSSEX COUNTY WILL
EXPIRE AT 200 PM EDT...
        
The storm which prompted the warning has weakened below severe 
limits, and is also exiting the warned area. Therefore, the warning 
will be allowed to expire.  However small hail and gusty winds are 
still possible with this thunderstorm before it completely moves out.

A Severe Thunderstorm Watch remains in effect until 800 PM EDT for
northwestern 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 4123 7442 4120 7437 4109 7450 4114 7492
      4121 7486 4123 7487 4128 7484 4135 7475
      4135 7472 4136 7470
TIME...MOT...LOC 1751Z 280DEG 16KT 4131 7455 

$$

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, 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, 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.