Alert archive / New Jersey / Severe Thunderstorm Warnings in 2018

Severe Thunderstorm Warning 93, NWS Philadelphia/Mount Holly

September 6, 2018Sussex County, New Jersey

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Sep 6, 2018, 4:29 PM EDT for Sussex County, New Jersey. It was in force for 31 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: Sep 6, 2018, 4:29 PM EDT (20:29 UTC)
Expired: Sep 6, 2018, 5:00 PM EDT
In force: 31 min
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon
Hail: 0.88 in
Wind: 60.0 mph

County Sussex County, NJ

The radar

The Philadelphia radar (KDIX), 141 km from the middle of the area, began a volume at 20:31 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 12:00Z, 8.5 hours before the alert went out and 168 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: 1443 J/kg
Mixed-layer CIN: -52 J/kg
Mixed-layer LCL: 719 m above ground
0-6 km bulk shear: 16 kt
0-1 km storm-relative helicity: 111 m²/s²
0-3 km storm-relative helicity: 110 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 2.7

Open this sounding in Storm Lab

The text

As transmitted.

098 
WUUS51 KPHI 062029
SVRPHI
NJC037-062100-
/O.NEW.KPHI.SV.W.0093.180906T2029Z-180906T2100Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service MOUNT HOLLY NJ
429 PM EDT THU SEP 6 2018

The National Weather Service in MOUNT HOLLY NJ  has issued a

* Severe Thunderstorm Warning for...
  Northwestern Sussex County in northwestern New Jersey...

* Until 500 PM EDT.

* At 428 PM EDT, a severe thunderstorm was located over Dingmans
  Ferry, or 7 miles southwest of Montague, moving southeast at 10
  mph.

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

  SOURCE...Radar indicated.

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

* Locations impacted include...
  Branchville, Crandon Lakes and Hainesville. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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.

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

&&

LAT...LON 4113 7469 4108 7491 4114 7492 4121 7486
      4123 7487 4124 7486 4127 7482
TIME...MOT...LOC 2028Z 330DEG 10KT 4121 7487 

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

amc

1 follow-up statement

217 
WWUS51 KPHI 062052
SVSPHI

Severe Weather Statement
National Weather Service MOUNT HOLLY NJ
452 PM EDT THU SEP 6 2018

NJC037-062101-
/O.EXP.KPHI.SV.W.0093.000000T0000Z-180906T2100Z/
Sussex NJ-
452 PM EDT THU SEP 6 2018

...THE SEVERE THUNDERSTORM WARNING FOR NORTHWESTERN SUSSEX COUNTY
WILL EXPIRE AT 500 PM EDT...
                
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 will be allowed to expire.

LAT...LON 4113 7469 4108 7491 4114 7492 4121 7486
      4123 7487 4124 7486 4127 7482
TIME...MOT...LOC 2051Z 330DEG 10KT 4116 7483 

$$

amc

The office that day

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

Issued	Product	Office	Counties	Lasted
Sep 6, 4:16 PM EDT	Special Weather Statement	PHI	Sussex	29 min
Sep 6, 5:21 PM EDT	Special Weather Statement	PHI	Sussex, Warren	24 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.