Alert archive / New Jersey / Severe Thunderstorm Warnings in 2018

Severe Thunderstorm Warning 84, NWS Philadelphia/Mount Holly

August 17, 20186 counties in New Jersey

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Aug 17, 2018, 8:47 PM EDT for 6 counties in New Jersey. It was in force for 43 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 17, 2018, 8:47 PM EDT (00:47 UTC)
Expired: Aug 17, 2018, 9:30 PM EDT
In force: 43 min
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon
Tornado: Possible
Hail: 0.75 in
Wind: 70.0 mph

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

The radar

The Philadelphia radar (KDIX), 92 km from the middle of the area, began a volume at 00:48 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 17, 8:50 PM EDT	TSTM WND DMG	Far Hills, NJ	REPORT OF TREES DOWN IN FAR HILLS AND BRIDGEWATER TOWNSHIP. TIME ESTIMATED FROM RADAR.
Aug 17, 9:05 PM EDT	TSTM WND DMG	Green Brook Twp, NJ	REPORT OF SOME TREES DOWN. TIME ESTIMATED FROM RADAR.

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

The watch it was issued in

The SPC watch in force over the same counties when this warning went out.

Issued	Product	Office	Lasted
Aug 17, 3:44 PM EDT	Severe Thunderstorm Watch	SPC	7 hr

The nearest sounding before it

Brookhaven, NY (KOKX), launched 00:00Z, 0.8 hours before the alert went out and 130 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.

260 
WUUS51 KPHI 180047
SVRPHI
NJC019-021-023-027-035-037-180130-
/O.NEW.KPHI.SV.W.0084.180818T0047Z-180818T0130Z/

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

The National Weather Service in Mount Holly NJ has issued a

* Severe Thunderstorm Warning for...
  Eastern Morris County in northern New Jersey...
  Southeastern Hunterdon County in northwestern New Jersey...
  East central Sussex County in northwestern New Jersey...
  Northern Mercer County in central New Jersey...
  Somerset County in northern New Jersey...
  Middlesex County in northern New Jersey...

* Until 930 PM EDT.

* At 846 PM EDT, severe thunderstorms were located along a line
  extending from Ogdensburg to near Mendham to New Hope, moving east
  at 30 mph.

  HAZARD...70 mph wind gusts.

  SOURCE...Emergency management. Hunterdon County reported tree 
           damage with this storm in Hampton earlier.

  IMPACT...Expect considerable tree damage. Damage is likely to 
           mobile homes, roofs, and outbuildings.

* Locations impacted include...
  New Brunswick, Perth Amboy, Morristown, Somerville, Somerset,
  Edison, Old Bridge, East Brunswick, Bridgewater, South Brunswick,
  Sayreville, North Brunswick, Carteret, Madison, Middlesex,
  Princeton, Florham Park, East Hanover, Lincoln Park and Bound
  Brook.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

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

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

&&

LAT...LON 4056 7421 4050 7428 4046 7426 4030 7443
      4034 7495 4092 7451 4114 7464 4113 7445
      4109 7450 4104 7450 4105 7445 4102 7443
      4100 7430 4090 7427 4091 7433 4075 7436
      4067 7446 4065 7440 4060 7446 4060 7421
TIME...MOT...LOC 0046Z 280DEG 25KT 4106 7459 4080 7456 4037 7494 

TORNADO...POSSIBLE
HAIL...<.75IN
WIND...70MPH
 
$$

CMS

2 follow-up statements

867 
WWUS51 KPHI 180110
SVSPHI

Severe Weather Statement
National Weather Service Mount Holly NJ
910 PM EDT FRI AUG 17 2018

NJC037-180120-
/O.CAN.KPHI.SV.W.0084.000000T0000Z-180818T0130Z/
Sussex NJ-
910 PM EDT FRI AUG 17 2018

...THE SEVERE THUNDERSTORM WARNING FOR EAST CENTRAL SUSSEX COUNTY IS
CANCELLED...

The storms which prompted the warning have moved out of the warned 
area. Therefore, the warning has been cancelled.

A severe thunderstorm watch remains in effect until 1100 PM EDT for
northern New Jersey.

LAT...LON 4056 7421 4050 7428 4046 7426 4030 7443
      4034 7495 4079 7461 4090 7445 4102 7443
      4100 7430 4090 7427 4091 7433 4075 7436
      4067 7446 4065 7440 4060 7446 4060 7421
TIME...MOT...LOC 0110Z 275DEG 25KT 4103 7439 4077 7436 4035 7487 

$$

NJC019-021-023-027-035-180130-
/O.CON.KPHI.SV.W.0084.000000T0000Z-180818T0130Z/
Morris NJ-Hunterdon NJ-Mercer NJ-Somerset NJ-Middlesex NJ-
910 PM EDT FRI AUG 17 2018

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 930 PM EDT
FOR EASTERN MORRIS...SOUTHEASTERN HUNTERDON...NORTHERN MERCER...
SOMERSET AND MIDDLESEX COUNTIES...

At 910 PM EDT, severe thunderstorms were located along a line
extending from near Bloomingdale to Florham Park to near Washington
Crossing, moving east at 30 mph.

HAZARD...70 mph wind gusts.

SOURCE...Public. Several reports of wind damage have been received 
         with this line of storms.

IMPACT...Expect considerable tree damage. Damage is likely to mobile 
         homes, roofs, and outbuildings.

Locations impacted include...
New Brunswick, Perth Amboy, Morristown, Somerville, Somerset, Edison,
Old Bridge, East Brunswick, Bridgewater, South Brunswick, Sayreville,
North Brunswick, Carteret, Madison, Middlesex, Princeton, Florham
Park, East Hanover, Lincoln Park and Bound Brook.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

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

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

&&

LAT...LON 4056 7421 4050 7428 4046 7426 4030 7443
      4034 7495 4079 7461 4090 7445 4102 7443
      4100 7430 4090 7427 4091 7433 4075 7436
      4067 7446 4065 7440 4060 7446 4060 7421
TIME...MOT...LOC 0110Z 275DEG 25KT 4103 7439 4077 7436 4035 7487 

HAIL...<.75IN
WIND...70MPH
 
$$

CMS

957 
WWUS51 KPHI 180121
SVSPHI

Severe Weather Statement
National Weather Service Mount Holly NJ
921 PM EDT FRI AUG 17 2018

NJC019-021-023-027-035-180130-
/O.EXP.KPHI.SV.W.0084.000000T0000Z-180818T0130Z/
Morris NJ-Hunterdon NJ-Mercer NJ-Somerset NJ-Middlesex NJ-
921 PM EDT FRI AUG 17 2018

...THE SEVERE THUNDERSTORM WARNING FOR EASTERN MORRIS...SOUTHEASTERN
HUNTERDON...NORTHERN MERCER...SOMERSET AND MIDDLESEX COUNTIES WILL
EXPIRE AT 930 PM EDT...
            
The storms which prompted the warning have weakened below severe
limits, and no longer pose an immediate threat to life or property.
Therefore, the warning will be allowed to expire.  However gusty
winds and heavy rain are still possible with these thunderstorms.

A severe thunderstorm watch remains in effect until 1100 PM EDT for
northern New Jersey.

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 4056 7421 4050 7428 4046 7426 4030 7443
      4034 7495 4079 7461 4090 7445 4102 7443
      4100 7430 4090 7427 4091 7433 4075 7436
      4067 7446 4065 7440 4060 7446 4060 7421
TIME...MOT...LOC 0120Z 280DEG 25KT 4102 7431 4076 7428 4034 7479 

$$

CMS

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, 8:48 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, 11:41 PM EDT	Severe Thunderstorm Warning	PHI	Middlesex, Morris, Somerset	34 min
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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.