Alert archive / New Jersey / Severe Thunderstorm Warnings in 2023

Severe Thunderstorm Warning 291, NWS Philadelphia/Mount Holly

August 12, 2023Sussex County, New Jersey

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Aug 12, 2023, 7:30 PM EDT for Sussex County, New Jersey. It was in force for 19 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 12, 2023, 7:30 PM EDT (23:30 UTC)
Expired: Aug 12, 2023, 7:49 PM EDT
In force: 19 min
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

County Sussex County, NJ

The radar

The Philadelphia radar (KDIX), 140 km from the middle of the area, began a volume at 23:33 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 12, 7:30 PM EDT	TSTM WND GST 51	2 Sw Vernon, NJ	NJ WxNet Station measured a 51 MPH gust in Vernon Township.

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 12, 6:07 PM EDT	Severe Thunderstorm Watch	SPC	6 hr

The nearest sounding before it

Brookhaven, NY (KOKX), launched 12:00Z, 11.5 hours before the alert went out and 142 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: 1539 m above ground
0-6 km bulk shear: 26 kt
0-1 km storm-relative helicity: 139 m²/s²
0-3 km storm-relative helicity: 158 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

417 
WUUS51 KPHI 122330
SVRPHI
NJC037-130000-
/O.NEW.KPHI.SV.W.0291.230812T2330Z-230813T0000Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Mount Holly NJ
730 PM EDT Sat Aug 12 2023

The National Weather Service in Mount Holly NJ has issued a

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

* Until 800 PM EDT.

* At 730 PM EDT, a severe thunderstorm was located over Highland
  Lake, or near West Milford, moving northeast at 35 mph.

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

  SOURCE...Radar indicated.

  IMPACT...Minor damage to vehicles is possible. Wind damage to 
           roofs, siding, trees, and power lines is possible.

* Locations impacted include...
  Hamburg, Sussex, Highland Lake and Vernon Valley. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4126 7450 4120 7436 4113 7446 4108 7450
      4121 7462 4128 7451
TIME...MOT...LOC 2330Z 237DEG 30KT 4118 7448 

HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.00 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

Hoeflich

1 follow-up statement

510 
WWUS51 KPHI 122349
SVSPHI

Severe Weather Statement
National Weather Service Mount Holly NJ
749 PM EDT Sat Aug 12 2023

NJC037-122358-
/O.CAN.KPHI.SV.W.0291.000000T0000Z-230813T0000Z/
Sussex NJ-
749 PM EDT Sat Aug 12 2023

...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN SUSSEX COUNTY IS
CANCELLED...
        
The storm which prompted the warning has moved out of the area.
Therefore, the warning has been cancelled.

A Severe Thunderstorm Watch remains in effect until midnight EDT for
northern and northwestern New Jersey.

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

LAT...LON 4126 7450 4120 7436 4113 7446 4108 7450
      4121 7462 4128 7451
TIME...MOT...LOC 2347Z 237DEG 30KT 4127 7430 

$$

Hoeflich

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 12, 12:57 PM EDT	Areal Flood Advisory	PHI	Gloucester, Salem	3 hr
Aug 12, 1:38 PM EDT	Areal Flood Advisory	PHI	Burlington, Camden, Gloucester	3 hr
Aug 12, 1:40 PM EDT	Special Weather Statement	PHI	Camden	35 min
Aug 12, 1:45 PM EDT	Severe Thunderstorm Warning	PHI	Burlington, Camden	25 min
Aug 12, 1:52 PM EDT	Severe Thunderstorm Warning	PHI	Atlantic, Burlington, Camden, Gloucester	38 min
Aug 12, 2:37 PM EDT	Special Weather Statement	PHI	Mercer	38 min
Aug 12, 5:46 PM EDT	Special Weather Statement	PHI	Salem	44 min
Aug 12, 6:13 PM EDT	Special Weather Statement	PHI	Hunterdon	47 min
Aug 12, 7:09 PM EDT	Special Weather Statement	PHI	Sussex	36 min

Nearby

Severe Thunderstorm Warnings in New Jersey, 2023 Every severe thunderstorm warning in 2023

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.