Alert archive / New Jersey / Severe Thunderstorm Warnings in 2017

Severe Thunderstorm Warning 171, NWS Philadelphia/Mount Holly

August 18, 2017Burlington County, Camden County, Ocean County, New Jersey

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Aug 18, 2017, 6:58 PM EDT for Burlington County, Camden County, Ocean County, New Jersey. It was in force for 29 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: Aug 18, 2017, 6:58 PM EDT (22:58 UTC)
Expired: Aug 18, 2017, 7:27 PM EDT
In force: 29 min
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon
Hail: 0.88 in
Wind: 60.0 mph

Counties Burlington County, NJ, Camden County, NJ, Ocean County, NJ

The radar

The Philadelphia radar (KDIX), 25 km from the middle of the area, began a volume at 22:58 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 18, 6:59 PM EDT	TSTM WND DMG	Mount Laurel, NJ	TREES DOWN AND POWER OUTAGES IN MOUNT LAUREL. TIME ESTIMATED BY 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 18, 2:27 PM EDT	Severe Thunderstorm Watch	SPC	9 hr

The nearest sounding before it

Brookhaven, NY (KOKX), launched 12:00Z, 11.0 hours before the alert went out and 184 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 1073 m above ground
0-6 km bulk shear: 30 kt
0-1 km storm-relative helicity: 147 m²/s²
0-3 km storm-relative helicity: 215 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.6

Open this sounding in Storm Lab

The text

As transmitted.

197 
WUUS51 KPHI 182258
SVRPHI
NJC005-007-029-182345-
/O.NEW.KPHI.SV.W.0171.170818T2258Z-170818T2345Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Mount Holly NJ
658 PM EDT FRI AUG 18 2017

The National Weather Service in Mount Holly NJ has issued a

* Severe Thunderstorm Warning for...
  Western Ocean County in southern New Jersey...
  North central Camden County in southern New Jersey...
  Central Burlington County in southern New Jersey...

* Until 745 PM EDT

* At 657 PM EDT, a severe thunderstorm was located over Mount Laurel,
  or 9 miles east of Camden, moving east at 25 mph.

  HAZARD...60 mph wind gusts and nickel size hail. 

  SOURCE...Radar indicated. 

  IMPACT...Expect damage to trees and power lines. 

* Locations impacted include...
  Cherry Hill, Evesham, Mount Laurel, Willingboro, Voorhees, Medford,
  Lindenwold, Lumberton, Mount Holly, Palmyra, Tabernacle,
  Presidential Lakes Estates, Pemberton, Wrightstown, Ramblewood,
  Barclay-Kingston, Cherry Hill Mall, Echelon, Marlton and
  Leisuretowne.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3982 7501 4000 7503 4009 7456 4008 7455
      4009 7453 4010 7449 3984 7445
TIME...MOT...LOC 2257Z 262DEG 20KT 3993 7492 

HAIL...0.88IN
WIND...60MPH
 
$$

SFJ

2 follow-up statements

622 
WWUS51 KPHI 182317
SVSPHI

Severe Weather Statement
National Weather Service Mount Holly NJ
717 PM EDT FRI AUG 18 2017

NJC005-007-029-182345-
/O.CON.KPHI.SV.W.0171.000000T0000Z-170818T2345Z/
Ocean NJ-Camden NJ-Burlington NJ-
717 PM EDT FRI AUG 18 2017

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 745 PM EDT
FOR WESTERN OCEAN...NORTHEASTERN CAMDEN AND CENTRAL BURLINGTON
COUNTIES...

At 717 PM EDT, a severe thunderstorm was located over Lumberton, or
17 miles east of Camden, moving east at 25 mph.

HAZARD...60 mph wind gusts and nickel size hail. 

SOURCE...Radar indicated. 

IMPACT...Expect damage to trees and power lines. 

Locations impacted include...
Evesham, Medford, Lumberton, Mount Holly, Tabernacle, Presidential
Lakes Estates, Pemberton, Wrightstown, Presidential Lakes, Browns
Mills, Jobstown, Leisuretowne, Jacksonville, Marlton, Medford Lakes,
Country Lake Estates, Nws Office, Pemberton Heights, New Egypt and
Fort Dix.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3982 7495 4003 7487 4009 7456 4008 7455
      4009 7453 4010 7449 3984 7445
TIME...MOT...LOC 2317Z 262DEG 20KT 3995 7478 

HAIL...0.88IN
WIND...60MPH
 
$$

SFJ

548 
WWUS51 KPHI 182327
SVSPHI

Severe Weather Statement
National Weather Service Mount Holly NJ
727 PM EDT FRI AUG 18 2017

NJC005-007-029-182337-
/O.CAN.KPHI.SV.W.0171.000000T0000Z-170818T2345Z/
Ocean NJ-Camden NJ-Burlington NJ-
727 PM EDT FRI AUG 18 2017

...THE SEVERE THUNDERSTORM WARNING FOR WESTERN OCEAN...NORTHEASTERN
CAMDEN AND CENTRAL BURLINGTON 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.

A severe thunderstorm watch remains in effect until 900 PM EDT for
southern and central New Jersey.

LAT...LON 3982 7495 4003 7487 4009 7456 4008 7455
      4009 7453 4010 7449 3984 7445
TIME...MOT...LOC 2325Z 262DEG 20KT 3996 7470 

$$

SFJ

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 18, 3:39 AM EDT	Flash Flood Watch	PHI	Atlantic, Burlington, Camden, Cape May, Cumberland, Gloucester and 10 more	18 hr
Aug 18, 3:41 AM EDT	Small Craft Advisory	PHI		18 hr
Aug 18, 10:51 AM EDT	Special Weather Statement	PHI	Ocean	54 min
Aug 18, 11:19 AM EDT	Areal Flood Advisory	PHI	Burlington, Ocean	116 min
Aug 18, 11:28 AM EDT	Special Weather Statement	PHI	Ocean	47 min
Aug 18, 5:08 PM EDT	Special Weather Statement	PHI	Hunterdon, Warren	37 min
Aug 18, 5:11 PM EDT	Severe Thunderstorm Warning	PHI	Hunterdon, Mercer, Somerset	49 min
Aug 18, 5:20 PM EDT	Areal Flood Advisory	PHI	Burlington, Camden, Gloucester, Mercer, Salem	3 hr
Aug 18, 5:39 PM EDT	Severe Thunderstorm Warning	PHI	Burlington, Camden, Gloucester, Salem	66 min
Aug 18, 5:42 PM EDT	Special Weather Statement	PHI	Hunterdon	33 min
Aug 18, 5:46 PM EDT	Severe Thunderstorm Warning	PHI	Hunterdon, Morris, Somerset	44 min
Aug 18, 5:50 PM EDT	Special Marine Warning	PHI		55 min
Aug 18, 5:54 PM EDT	Severe Thunderstorm Warning	PHI	Burlington, Mercer, Middlesex, Monmouth	66 min
Aug 18, 6:13 PM EDT	Special Weather Statement	PHI	Middlesex, Somerset	32 min
Aug 18, 6:20 PM EDT	Areal Flood Advisory	PHI	Middlesex, Somerset	3 hr
Aug 18, 6:23 PM EDT	Special Weather Statement	PHI	Somerset	37 min
Aug 18, 6:38 PM EDT	Special Weather Statement	PHI	Camden, Gloucester, Salem	37 min
Aug 18, 6:41 PM EDT	Special Marine Warning	PHI		64 min
Aug 18, 6:43 PM EDT	Areal Flood Advisory	PHI	Monmouth, Ocean	3 hr
Aug 18, 6:48 PM EDT	Special Weather Statement	PHI	Cumberland, Gloucester, Salem	27 min
Aug 18, 6:53 PM EDT	Special Weather Statement	PHI	Middlesex, Monmouth	52 min
Aug 18, 6:54 PM EDT	Special Weather Statement	PHI	Burlington, Camden, Gloucester	51 min
Aug 18, 7:00 PM EDT	Severe Thunderstorm Warning	PHI	Burlington, Mercer, Middlesex, Monmouth, Ocean	60 min
Aug 18, 7:19 PM EDT	Areal Flood Advisory	PHI	Atlantic, Burlington, Cape May, Cumberland, Ocean, Salem	3 hr
Aug 18, 7:25 PM EDT	Special Weather Statement	PHI	Atlantic	50 min
Aug 18, 7:34 PM EDT	Special Weather Statement	PHI	Cape May	26 min
Aug 18, 7:39 PM EDT	Special Marine Warning	PHI		66 min
Aug 18, 7:43 PM EDT	Special Weather Statement	PHI	Burlington, Ocean	47 min
Aug 18, 7:44 PM EDT	Special Marine Warning	PHI		61 min
Aug 18, 7:49 PM EDT	Severe Thunderstorm Warning	PHI	Atlantic, Cape May, Cumberland, Gloucester	35 min

Nearby

Severe Thunderstorm Warnings in New Jersey, 2017 Every severe thunderstorm warning in 2017

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.