Alert archive / New Jersey / Severe Thunderstorm Warnings in 2020

Severe Thunderstorm Warning 203, NWS Philadelphia/Mount Holly

August 3, 20204 counties in New Jersey

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Aug 3, 2020, 8:26 PM EDT for 4 counties in New Jersey. It was in force for 34 min. 2 reports 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: Aug 3, 2020, 8:26 PM EDT (00:26 UTC)
Expired: Aug 3, 2020, 9:00 PM EDT
In force: 34 min
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

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

The radar

The Philadelphia radar (KDIX), 89 km from the middle of the area, began a volume at 00:27 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
Aug 3, 8:30 PM EDT	TSTM WND DMG	Bedminster Twp, NJ	TREES DOWN IN BEDMINSTER.
Aug 3, 8:47 PM EDT	TSTM WND DMG	1 S Chester, NJ	DOWNED TREE ON COOPER LANE NEAR TIGER BROOK PARK IN CHESTER. TIME ESTIMATED 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 00:00Z, 0.4 hours before the alert went out and 137 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: 560 J/kg
Mixed-layer CIN: -65 J/kg
Mixed-layer LCL: 1172 m above ground
0-6 km bulk shear: 28 kt
0-1 km storm-relative helicity: 54 m²/s²
0-3 km storm-relative helicity: 83 m²/s²
Significant tornado parameter: 0.1
Supercell composite: 1.5

Open this sounding in Storm Lab

The text

As transmitted.

874 
WUUS51 KPHI 040026
SVRPHI
NJC019-023-027-035-040115-
/O.NEW.KPHI.SV.W.0203.200804T0026Z-200804T0115Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Mount Holly NJ
826 PM EDT Mon Aug 3 2020

The National Weather Service in Mount Holly NJ has issued a

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

* Until 915 PM EDT.

* At 826 PM EDT, a severe thunderstorm was located over Bridgewater,
  or near Somerville, moving northeast at 30 mph.

  HAZARD...60 mph wind gusts.

  SOURCE...Radar indicated.

  IMPACT...Damage to roofs, siding, trees, and power lines is 
           possible.

* Locations impacted include...
  Morristown, Somerville, Somerset, Bridgewater, Dover, Madison,
  Middlesex, Florham Park, East Hanover, Bound Brook, Manville,
  Chatham, Boonton, Wharton, Rockaway, Morris Plains, Mount
  Arlington, Mendham, Mountain Lakes and High Bridge.

This includes the following highways...
 Interstate 78 in New Jersey between mile markers 15 and 42.
 Interstate 80 in New Jersey between mile markers 27 and 48.
 Interstate 287 in New Jersey between mile markers 7 and 45.

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 4082 7434 4079 7437 4074 7437 4067 7446
      4066 7445 4066 7440 4063 7442 4060 7446
      4060 7439 4043 7458 4068 7503 4091 7468
      4092 7465 4099 7457 4088 7434 4086 7432
TIME...MOT...LOC 0026Z 212DEG 27KT 4060 7468 

HAIL...<.75IN
WIND...60MPH
 
$$

Robertson

2 follow-up statements

616 
WWUS51 KPHI 040050
SVSPHI

Severe Weather Statement
National Weather Service Mount Holly NJ
850 PM EDT Mon Aug 3 2020

NJC019-023-040100-
/O.CAN.KPHI.SV.W.0203.000000T0000Z-200804T0115Z/
Hunterdon NJ-Middlesex NJ-
850 PM EDT Mon Aug 3 2020

...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN HUNTERDON AND
NORTH CENTRAL MIDDLESEX COUNTIES IS CANCELLED...
    
The severe thunderstorm which prompted the warning has moved out of 
the warned area. Therefore, the warning has been cancelled.

LAT...LON 4082 7434 4079 7437 4074 7437 4067 7446
      4066 7445 4066 7440 4061 7445 4078 7487
      4091 7466 4099 7457 4088 7434 4086 7432
TIME...MOT...LOC 0050Z 225DEG 31KT 4074 7447 

$$

NJC027-035-040115-
/O.CON.KPHI.SV.W.0203.000000T0000Z-200804T0115Z/
Morris NJ-Somerset NJ-
850 PM EDT Mon Aug 3 2020

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 915 PM EDT
FOR MORRIS AND NORTHEASTERN SOMERSET COUNTIES...

At 850 PM EDT, a severe thunderstorm was located over Madison, or
near Morristown, moving northeast at 35 mph.

HAZARD...60 mph wind gusts.

SOURCE...Radar indicated.

IMPACT...Damage to roofs, siding, trees, and power lines is 
         possible.

Locations impacted include...
Morristown, Dover, Madison, Florham Park, East Hanover, Chatham,
Boonton, Wharton, Rockaway, Morris Plains, Mount Arlington, Mendham,
Mountain Lakes, Peapack And Gladstone, Chester, Victory Gardens, Far
Hills, Long Valley, Millington and Succasunna.

This includes the following highways...
 Interstate 78 in New Jersey between mile markers 37 and 42.
 Interstate 80 in New Jersey between mile markers 28 and 48.
 Interstate 287 in New Jersey between mile markers 25 and 45.

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 4082 7434 4079 7437 4074 7437 4067 7446
      4066 7445 4066 7440 4061 7445 4078 7487
      4091 7466 4099 7457 4088 7434 4086 7432
TIME...MOT...LOC 0050Z 225DEG 31KT 4074 7447 

HAIL...<.75IN
WIND...60MPH
 
$$

Robertson

638 
WWUS51 KPHI 040100
SVSPHI

Severe Weather Statement
National Weather Service Mount Holly NJ
900 PM EDT Mon Aug 3 2020

NJC027-035-040110-
/O.CAN.KPHI.SV.W.0203.000000T0000Z-200804T0115Z/
Morris NJ-Somerset NJ-
900 PM EDT Mon Aug 3 2020

...THE SEVERE THUNDERSTORM WARNING FOR MORRIS AND NORTHEASTERN
SOMERSET 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 and 
heavy rain are still possible with this thunderstorm.

LAT...LON 4082 7434 4079 7437 4074 7437 4067 7446
      4066 7445 4066 7440 4061 7445 4078 7487
      4091 7466 4099 7457 4088 7434 4086 7432
TIME...MOT...LOC 0059Z 212DEG 27KT 4080 7442 

$$

Robertson

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 3, 8:07 PM EDT	Special Weather Statement	PHI	Hunterdon, Somerset, Warren	23 min
Aug 3, 9:02 PM EDT	Special Weather Statement	PHI	Morris	28 min
Aug 4, 5:17 AM EDT	Areal Flood Advisory	PHI	Burlington, Camden, Gloucester, Hunterdon, Mercer, Salem and 1 more	4 hr
Aug 4, 5:55 AM EDT	Special Marine Warning	PHI		21 min
Aug 4, 7:28 AM EDT	Flash Flood Warning	PHI	Gloucester, Salem	3 hr
Aug 4, 8:38 AM EDT	Special Marine Warning	PHI		52 min
Aug 4, 9:16 AM EDT	Tornado Warning	PHI	Cumberland	18 min
Aug 4, 9:28 AM EDT	Special Marine Warning	PHI		32 min
Aug 4, 9:31 AM EDT	Special Marine Warning	PHI		59 min
Aug 4, 9:42 AM EDT	Tornado Warning	PHI	Atlantic, Cape May	19 min
Aug 4, 10:02 AM EDT	Flash Flood Warning	PHI	Gloucester, Salem	4 hr
Aug 4, 10:15 AM EDT	Tornado Warning	PHI	Atlantic, Burlington, Ocean	14 min
Aug 4, 10:20 AM EDT	Flash Flood Warning	PHI	Burlington, Camden, Gloucester	4 hr
Aug 4, 11:00 AM EDT	Tornado Warning Tornado observed	PHI	Monmouth, Ocean	11 min
Aug 4, 11:01 AM EDT	Flash Flood Warning	PHI	Burlington, Hunterdon, Mercer, Middlesex, Monmouth, Ocean and 1 more	4 hr
Aug 4, 11:13 AM EDT	Areal Flood Advisory	PHI	Sussex, Warren	4 hr
Aug 4, 11:43 AM EDT	Flash Flood Warning	PHI	Warren	4 hr
Aug 4, 11:59 AM EDT	Areal Flood Advisory	PHI	Hunterdon, Middlesex, Monmouth, Morris, Somerset	4 hr
Aug 4, 2:33 PM EDT	River Flood Warning	PHI	Hunterdon, Somerset	5 hr
Aug 4, 2:47 PM EDT	Areal Flood Warning	PHI	Hunterdon, Mercer, Middlesex, Somerset, Warren	9 hr
Aug 4, 3:42 PM EDT	Areal Flood Warning	PHI	Warren	4 hr
Aug 4, 4:37 PM EDT	Areal Flood Warning	PHI	Cumberland, Salem	10 hr
Aug 4, 5:04 PM EDT	Small Craft Advisory	PHI		14 hr
Aug 4, 5:30 PM EDT	Coastal Flood Statement	PHI	Ocean	103 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.