Alert archive / New Jersey / Severe Thunderstorm Warnings in 2020

Severe Thunderstorm Warning 94, NWS Philadelphia/Mount Holly

June 28, 2020Mercer County, Monmouth County, Ocean County, New Jersey

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Jun 28, 2020, 8:34 PM EDT for Mercer County, Monmouth County, Ocean County, New Jersey. It was in force for 41 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, 8:34 PM EDT (00:34 UTC)
Expired: Jun 28, 2020, 9:15 PM EDT
In force: 41 min
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

Counties Mercer County, NJ, Monmouth County, NJ, Ocean County, NJ

The radar

The Philadelphia radar (KDIX), 27 km from the middle of the area, began a volume at 00:38 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 nearest sounding before it

Brookhaven, NY (KOKX), launched 00:00Z, 0.6 hours before the alert went out and 158 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: 1384 J/kg
Mixed-layer CIN: -81 J/kg
Mixed-layer LCL: 1024 m above ground
0-6 km bulk shear: 28 kt
0-1 km storm-relative helicity: 81 m²/s²
0-3 km storm-relative helicity: 100 m²/s²
Significant tornado parameter: 0.3
Supercell composite: 1.0

Open this sounding in Storm Lab

The text

As transmitted.

316 
WUUS51 KPHI 290034
SVRPHI
NJC021-025-029-290115-
/O.NEW.KPHI.SV.W.0094.200629T0034Z-200629T0115Z/

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

The National Weather Service in Mount Holly NJ has issued a

* Severe Thunderstorm Warning for...
  Northwestern Ocean County in southern New Jersey...
  Southeastern Mercer County in central New Jersey...
  Southwestern Monmouth County in central New Jersey...

* Until 915 PM EDT.

* At 834 PM EDT, a severe thunderstorm was located over Windsor, or
  11 miles east of Trenton, moving east at 15 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...
  Manalapan, Hightstown, Allentown, Roosevelt, Cassville, Clarksburg,
  Vista Center, Edinburg, Windsor, Woodruff, Twin Rivers, Six Flags
  Theme Park, Imlaystown, Cream Ridge, Jacksons Mills, West Freehold,
  Mercerville-Hamilton Square, Freehold, Yardville-Groveville and New
  Egypt.

This includes the following highways...
 New Jersey Turnpike between exits 8 and 8A.
 Interstate 195 in New Jersey between mile markers 4 and 22.

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.

In addition to large hail and damaging winds, frequent cloud to
ground lightning is occurring with this storm. Move indoors
immediately. Remember, if you can hear thunder, you are close enough
to be struck by lightning.

&&

LAT...LON 3998 7438 4011 7457 4014 7459 4014 7462
      4017 7467 4030 7460 4029 7452 4027 7448
      4025 7448 4028 7440 4026 7427
TIME...MOT...LOC 0034Z 286DEG 12KT 4021 7455 

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

Staarmann

2 follow-up statements

345 
WWUS51 KPHI 290050
SVSPHI

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

NJC021-290059-
/O.CAN.KPHI.SV.W.0094.000000T0000Z-200629T0115Z/
Mercer NJ-
850 PM EDT Sun Jun 28 2020

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN MERCER COUNTY IS
CANCELLED...
    
The severe thunderstorm which prompted the warning has moved out of 
the warned area. Therefore, the warning has been cancelled.

LAT...LON 3998 7438 4011 7457 4017 7461 4018 7461
      4018 7457 4022 7454 4023 7450 4025 7448
      4025 7446 4028 7440 4026 7427
TIME...MOT...LOC 0049Z 290DEG 19KT 4016 7445 

$$

NJC025-029-290115-
/O.CON.KPHI.SV.W.0094.000000T0000Z-200629T0115Z/
Ocean NJ-Monmouth NJ-
850 PM EDT Sun Jun 28 2020

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 915 PM EDT
FOR NORTHWESTERN OCEAN AND SOUTHWESTERN MONMOUTH COUNTIES...

At 849 PM EDT, a severe thunderstorm was located over Six Flags Theme
Park, or 17 miles east of Trenton, moving east 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...
Manalapan, Allentown, Roosevelt, Cassville, Clarksburg, Vista Center,
Woodruff, Six Flags Theme Park, Imlaystown, Cream Ridge, Jacksons
Mills, West Freehold, Freehold and New Egypt.

This includes Interstate 195 in New Jersey between mile markers 9 and
22.
 
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.

Frequent cloud to ground lightning is occurring with this storm. Move
indoors immediately. Lightning is one of nature's leading killers.
Remember, if you can hear thunder, you are close enough to be struck
by lightning.

&&

LAT...LON 3998 7438 4011 7457 4017 7461 4018 7461
      4018 7457 4022 7454 4023 7450 4025 7448
      4025 7446 4028 7440 4026 7427
TIME...MOT...LOC 0049Z 290DEG 19KT 4016 7445 

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

Staarmann

897 
WWUS51 KPHI 290105
SVSPHI

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

NJC025-029-290115-
/O.EXP.KPHI.SV.W.0094.000000T0000Z-200629T0115Z/
Ocean NJ-Monmouth NJ-
905 PM EDT Sun Jun 28 2020

...THE SEVERE THUNDERSTORM WARNING FOR NORTHWESTERN OCEAN AND
SOUTHWESTERN MONMOUTH COUNTIES WILL EXPIRE AT 915 PM EDT...
        
The storm which prompted the warning has weakened below severe
limits, and has exited the warned area. Therefore, the warning will
be allowed to expire.  However gusty winds and heavy rain are still
possible with this thunderstorm.

LAT...LON 3998 7438 4011 7457 4017 7461 4018 7461
      4018 7457 4022 7454 4023 7450 4025 7448
      4025 7446 4028 7440 4026 7427
TIME...MOT...LOC 0105Z 286DEG 12KT 4015 7440 

$$

Staarmann

The office that day

Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jun 28, 9:04 PM EDT	Special Weather Statement	PHI	Ocean	26 min
Jun 28, 9:10 PM EDT	Special Marine Warning	PHI		2 hr
Jun 29, 6:58 PM EDT	Special Marine Warning	PHI		62 min
Jun 29, 7:20 PM EDT	Special Weather Statement	PHI	Monmouth	40 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.