Alert archive / New Jersey / Severe Thunderstorm Warnings in 2013

Severe Thunderstorm Warning 127, NWS Philadelphia/Mount Holly

November 18, 2013Middlesex County, Somerset County, New Jersey

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Nov 18, 2013, 4:06 AM EST for Middlesex County, Somerset County, New Jersey. It was in force for 24 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: Nov 18, 2013, 4:06 AM EST (09:06 UTC)
Expired: Nov 18, 2013, 4:30 AM EST
In force: 24 min
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon

Counties Middlesex County, NJ, Somerset County, NJ

The radar

The Philadelphia radar (KDIX), 71 km from the middle of the area, began a volume at 09:08 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
Nov 18, 4:28 AM EST	TSTM WND GST 45	Metuchen, NJ

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
Nov 18, 1:07 AM EST	Severe Thunderstorm Watch	SPC	5 hr

The nearest sounding before it

Brookhaven, NY (KOKX), launched 00:00Z, 9.1 hours before the alert went out and 128 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: 520 m above ground
0-6 km bulk shear: 36 kt
0-1 km storm-relative helicity: 135 m²/s²
0-3 km storm-relative helicity: 126 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

769 
WUUS51 KPHI 180906
SVRPHI
NJC023-035-180930-
/O.NEW.KPHI.SV.W.0127.131118T0906Z-131118T0930Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
406 AM EST MON NOV 18 2013

THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  EAST CENTRAL SOMERSET COUNTY IN NORTHERN NEW JERSEY...
  NORTHEASTERN MIDDLESEX COUNTY IN NORTHERN NEW JERSEY...

* UNTIL 430 AM EST

* AT 359 AM EST...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  LINE OF SEVERE THUNDERSTORMS. THESE SEVERE STORMS EXTENDED FROM
  MILLINGTON TO SOUTH BOUND BROOK TO HEATHCOTE...MOVING NORTHEAST AT
  65 MPH. THESE STORMS ARE CAPABLE OF PRODUCING DAMAGING WINDS IN
  EXCESS OF 60 MPH. 

* SEVERE THUNDERSTORMS WILL BE NEAR...
  NEW BRUNSWICK AND EDISON AROUND 410 AM EST...
  PERTH AMBOY AND COLONIA AROUND 415 AM EST...
  CARTERET AROUND 420 AM EST...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

SEVERE THUNDERSTORMS PRODUCE WINDS OF MORE THAN 57 MPH...OR HAIL ONE
INCH OR LARGER.

THIS SEVERE THUNDERSTORM MAY CONTAIN LITTLE OR NO LIGHTNING. DO NOT
WAIT TO HEAR THUNDER BEFORE TAKING COVER. SEEK SHELTER IMMEDIATELY
INSIDE A STURDY STRUCTURE AND STAY AWAY FROM WINDOWS.

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 700 AM EST MONDAY
MORNING FOR DELAWARE AND NORTHEASTERN MARYLAND AND NEW JERSEY AND
EASTERN PENNSYLVANIA.

&&

LAT...LON 4056 7421 4055 7424 4050 7425 4049 7427
      4046 7462 4065 7452 4067 7448 4067 7440
      4060 7444 4061 7431 4060 7429 4061 7421
      4059 7420
TIME...MOT...LOC 0904Z 241DEG 58KT 4069 7441 4059 7445
          4043 7453

$$

FORECASTER: HEAVENER

The office that day

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

Issued	Product	Office	Counties	Lasted
Nov 18, 2:46 AM EST	Severe Thunderstorm Warning	PHI	Salem	59 min
Nov 18, 2:54 AM EST	Severe Thunderstorm Warning	PHI	Hunterdon, Morris, Somerset, Sussex, Warren	66 min
Nov 18, 3:04 AM EST	Special Marine Warning	PHI		86 min
Nov 18, 3:29 AM EST	Severe Thunderstorm Warning	PHI	Atlantic, Burlington, Camden, Cumberland, Gloucester, Hunterdon and 6 more	61 min
Nov 18, 3:39 AM EST	Severe Thunderstorm Warning	PHI	Atlantic, Cape May, Cumberland	66 min
Nov 18, 3:43 AM EST	Special Marine Warning	PHI		92 min
Nov 18, 4:20 AM EST	Special Marine Warning	PHI		85 min
Nov 18, 4:28 AM EST	Special Weather Statement	PHI	Atlantic, Burlington, Monmouth, Ocean	32 min

Nearby

Severe Thunderstorm Warnings in New Jersey, 2013 Every severe thunderstorm warning in 2013

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.