Alert archive / New Jersey / Severe Thunderstorm Warnings in 2018

Severe Thunderstorm Warning 85, NWS Philadelphia/Mount Holly

August 17, 2018Middlesex County, Morris County, Somerset County, New Jersey

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Aug 17, 2018, 11:41 PM EDT for Middlesex County, Morris County, Somerset County, New Jersey. It was in force for 34 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: Aug 17, 2018, 11:41 PM EDT (03:41 UTC)
Expired: Aug 18, 2018, 12:15 AM EDT
In force: 34 min
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

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

The radar

The Philadelphia radar (KDIX), 82 km from the middle of the area, began a volume at 03:44 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, 3.7 hours before the alert went out and 132 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: 802 J/kg
Mixed-layer CIN: -65 J/kg
Mixed-layer LCL: 900 m above ground
0-6 km bulk shear: 14 kt
0-1 km storm-relative helicity: 59 m²/s²
0-3 km storm-relative helicity: 119 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

425 
WUUS51 KPHI 180341
SVRPHI
NJC023-027-035-180415-
/O.NEW.KPHI.SV.W.0085.180818T0341Z-180818T0415Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Mount Holly NJ
1141 PM EDT FRI AUG 17 2018

The National Weather Service in Mount Holly NJ has issued a

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

* Until 1215 AM EDT.

* At 1141 PM EDT, a severe thunderstorm was located over Millington,
  or near Plainfield, moving northeast at 35 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...
  Madison, Middlesex, Florham Park, East Hanover, Bound Brook,
  Chatham, Far Hills, Millington, Basking Ridge, Society Hill, South
  Plainfield, North Plainfield, Bernardsville, Dunellen and Watchung.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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 4053 7450 4069 7462 4084 7433 4082 7434
      4079 7437 4076 7438 4075 7436 4074 7437
      4067 7446 4066 7445 4066 7441 4065 7440
      4060 7446 4060 7431
TIME...MOT...LOC 0341Z 239DEG 30KT 4065 7448 

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

MPS

1 follow-up statement

785 
WWUS51 KPHI 180405
SVSPHI

Severe Weather Statement
National Weather Service Mount Holly NJ
1205 AM EDT SAT AUG 18 2018

NJC023-027-035-180415-
/O.EXP.KPHI.SV.W.0085.000000T0000Z-180818T0415Z/
Morris NJ-Somerset NJ-Middlesex NJ-
1205 AM EDT SAT AUG 18 2018

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN MORRIS...
NORTHEASTERN SOMERSET AND NORTH CENTRAL MIDDLESEX COUNTIES WILL
EXPIRE AT 1215 AM 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.

To report severe weather, contact your nearest law enforcement
agency. They will relay your report to the National Weather Service
in Mount Holly NJ.

LAT...LON 4053 7450 4069 7462 4084 7433 4082 7434
      4079 7437 4076 7438 4075 7436 4074 7437
      4067 7446 4066 7445 4066 7441 4065 7440
      4060 7446 4060 7431
TIME...MOT...LOC 0405Z 239DEG 30KT 4074 7427 

$$

MPS

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 17, 8:17 PM EDT	Severe Thunderstorm Warning	PHI	Hunterdon, Morris, Somerset, Sussex, Warren	43 min
Aug 17, 8:47 PM EDT	Severe Thunderstorm Warning	PHI	Hunterdon, Mercer, Middlesex, Morris, Somerset, Sussex	43 min
Aug 17, 8:48 PM EDT	Special Weather Statement	PHI	Sussex	27 min
Aug 17, 9:26 PM EDT	Special Weather Statement	PHI	Mercer, Middlesex, Somerset	34 min
Aug 17, 10:59 PM EDT	Areal Flood Advisory	PHI	Hunterdon, Middlesex, Morris, Somerset, Warren	75 min
Aug 17, 11:25 PM EDT	Special Weather Statement	PHI	Somerset	35 min
Aug 17, 11:30 PM EDT	Flash Flood Warning	PHI	Hunterdon, Middlesex, Morris, Somerset	4 hr
Aug 17, 11:52 PM EDT	Special Weather Statement	PHI	Middlesex	23 min
Aug 18, 12:56 AM EDT	Areal Flood Advisory	PHI	Gloucester, Salem	4 hr
Aug 18, 2:37 AM EDT	Special Weather Statement	PHI	Ocean	23 min
Aug 18, 2:38 AM EDT	Special Marine Warning	PHI		52 min
Aug 18, 2:41 AM EDT	Special Weather Statement	PHI	Atlantic, Cumberland	34 min
Aug 18, 2:46 AM EDT	Severe Thunderstorm Warning	PHI	Ocean	14 min
Aug 18, 3:15 AM EDT	Special Marine Warning	PHI		30 min
Aug 18, 3:16 AM EDT	Flash Flood Watch	PHI	Burlington, Camden, Gloucester, Hunterdon, Mercer, Middlesex and 7 more	20 hr
Aug 18, 3:34 PM EDT	Special Weather Statement	PHI	Sussex	41 min
Aug 18, 3:40 PM EDT	Small Craft Advisory	PHI		45 hr
Aug 18, 4:14 PM EDT	Special Weather Statement	PHI	Sussex	46 min
Aug 18, 4:33 PM EDT	Special Weather Statement	PHI	Gloucester	42 min
Aug 18, 5:16 PM EDT	Special Weather Statement	PHI	Burlington, Camden	44 min
Aug 18, 5:44 PM EDT	Areal Flood Advisory	PHI	Burlington, Camden	98 min
Aug 18, 5:55 PM EDT	Special Weather Statement	PHI	Burlington	35 min
Aug 18, 6:17 PM EDT	Severe Thunderstorm Warning	PHI	Burlington, Ocean	43 min
Aug 18, 6:31 PM EDT	Special Marine Warning	PHI		119 min
Aug 18, 6:44 PM EDT	Severe Thunderstorm Warning	PHI	Ocean	29 min

Nearby

Severe Thunderstorm Warnings in New Jersey, 2018 Every severe thunderstorm warning in 2018

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.