Alert archive / New Jersey / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 232, NWS Philadelphia/Mount Holly

September 18, 20124 counties in New Jersey

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Sep 18, 2012, 6:52 PM EDT for 4 counties in New Jersey. It was in force for 53 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: Sep 18, 2012, 6:52 PM EDT (22:52 UTC)
Expired: Sep 18, 2012, 7:45 PM EDT
In force: 53 min
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon

Counties Middlesex County, NJ, Monmouth County, NJ, Morris County, NJ, Somerset County, NJ

The radar

The Philadelphia radar (KDIX), 73 km from the middle of the area, began a volume at 22:52 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
Sep 18, 6:56 PM EDT	TSTM WND DMG	East Hanover, NJ	SOME TREES DOWN THROUGHOUT COUNTY
Sep 18, 7:18 PM EDT	MARINE TSTM WIND 44	8 S Seagate, NY	MESONET

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
Sep 18, 12:10 PM EDT	Tornado Watch	SPC	9 hr

The nearest sounding before it

Brookhaven, NY (KOKX), launched 12:00Z, 10.9 hours before the alert went out and 118 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: 114 J/kg
Mixed-layer CIN: -4 J/kg
Mixed-layer LCL: 721 m above ground
0-6 km bulk shear: 45 kt
0-1 km storm-relative helicity: 224 m²/s²
0-3 km storm-relative helicity: 267 m²/s²
Significant tornado parameter: 0.1
Supercell composite: 0.6

Open this sounding in Storm Lab

The text

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

418 
WUUS51 KPHI 182252
SVRPHI
NJC023-025-027-035-182345-
/O.NEW.KPHI.SV.W.0232.120918T2252Z-120918T2345Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
652 PM EDT TUE SEP 18 2012

THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  NORTHERN MONMOUTH COUNTY IN CENTRAL NEW JERSEY...
  THIS INCLUDES THE CITY OF LONG BRANCH...
  MIDDLESEX COUNTY IN NORTHERN NEW JERSEY...
  THIS INCLUDES THE CITIES OF...SOUTH AMBOY...PERTH AMBOY...NEW
  BRUNSWICK...
  SOUTHEASTERN MORRIS COUNTY IN NORTHERN NEW JERSEY...
  EAST CENTRAL SOMERSET COUNTY IN NORTHERN NEW JERSEY...

* UNTIL 745 PM EDT

* AT 646 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  LINE OF SEVERE THUNDERSTORMS CAPABLE OF PRODUCING DAMAGING WINDS IN
  EXCESS OF 60 MPH.  THESE STORMS WERE LOCATED ALONG A LINE EXTENDING
  FROM PARSIPPANY TO 7 MILES WEST OF ROOSEVELT...OR ALONG A LINE
  EXTENDING FROM 16 MILES WEST OF CLIFTON TO 8 MILES EAST OF
  TRENTON...AND MOVING EAST AT 40 MPH.

* SEVERE THUNDERSTORMS WILL BE NEAR...
  CLARKSBURG...ROOSEVELT...NEW BRUNSWICK AND JAMESBURG AROUND 700 PM
  EDT...
  LINCOLN PARK...PEQUANNOCK TOWNSHIP...MANALAPAN AND EDISON AROUND
  705 PM EDT...
  MANALAPAN AND SAYREVILLE AROUND 710 PM EDT...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

THIS LINE OF STORMS 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.

PLEASE REPORT HAIL OR STRONG WINDS TO THE NATIONAL WEATHER SERVICE BY
CALLING TOLL FREE...1-877-633-6772...WHEN YOU CAN DO SO SAFELY.

A TORNADO WATCH REMAINS IN EFFECT UNTIL 900 PM EDT TUESDAY EVENING
FOR SOUTHERN DELAWARE AND NEW JERSEY.

&&

LAT...LON 4029 7397 4027 7398 4017 7450 4093 7449
      4097 7428 4091 7427 4090 7433 4086 7432
      4074 7436 4067 7445 4067 7440 4061 7443
      4060 7421 4056 7420 4047 7425 4042 7401
      4048 7402 4048 7400 4041 7396
TIME...MOT...LOC 2252Z 255DEG 35KT 4087 7440 4024 7455

$$

GORSE

1 follow-up statement

148 
WWUS51 KPHI 182315
SVSPHI

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
715 PM EDT TUE SEP 18 2012

NJC027-035-182325-
/O.CAN.KPHI.SV.W.0232.000000T0000Z-120918T2345Z/
MORRIS NJ-SOMERSET NJ-
715 PM EDT TUE SEP 18 2012

...THE SEVERE THUNDERSTORM WARNING FOR EAST CENTRAL SOMERSET AND
SOUTHEASTERN MORRIS COUNTIES IS CANCELLED...

PLEASE REPORT HAIL OR STRONG WINDS TO THE NATIONAL WEATHER SERVICE BY
CALLING TOLL FREE...1-877-633-6772...WHEN YOU CAN DO SO SAFELY.

A TORNADO WATCH REMAINS IN EFFECT UNTIL 900 PM EDT TUESDAY EVENING
FOR SOUTHERN DELAWARE AND NEW JERSEY.

LAT...LON 4027 7398 4017 7450 4061 7440 4060 7421
      4056 7420 4054 7424 4047 7425 4045 7420
      4042 7401 4048 7402 4048 7400 4040 7396
TIME...MOT...LOC 2315Z 255DEG 35KT 4093 7411 4030 7427

$$

NJC023-025-182345-
/O.CON.KPHI.SV.W.0232.000000T0000Z-120918T2345Z/
MIDDLESEX NJ-MONMOUTH NJ-
715 PM EDT TUE SEP 18 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 745 PM EDT
FOR NORTHERN MONMOUTH AND EASTERN MIDDLESEX COUNTIES...

AT 714 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
INDICATE A LINE OF SEVERE THUNDERSTORMS CAPABLE OF PRODUCING DAMAGING
WINDS IN EXCESS OF 60 MPH.  THESE STORMS WERE LOCATED ALONG A LINE
EXTENDING FROM 24 MILES NORTH OF CARTERET TO MARLBORO...OR ALONG A
LINE EXTENDING FROM PATERSON TO 13 MILES SOUTH OF SOUTH AMBOY...
MOVING EAST AT 40 MPH.

SEVERE THUNDERSTORMS WILL BE NEAR...
  HOLMDEL...UNION BEACH AND KEYPORT BY 720 PM EDT...
  MIDDLETOWN...PORT MONMOUTH...NORTH MIDDLETOWN AND LINCROFT BY 725
  PM EDT...
  OAKHURST...TINTON FALLS AND SHREWSBURY BY 730 PM EDT...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

THIS LINE OF STORMS MAY CONTAIN LITTLE OR NO LIGHTNING. 
DO NOT WAIT FOR THUNDER BEFORE TAKING COVER. SEEK SHELTER 
IMMEDIATELY INSIDE A STURDY STRUCTURE AND STAY AWAY FROM WINDOWS.

PLEASE REPORT HAIL OR STRONG WINDS TO THE NATIONAL WEATHER SERVICE BY
CALLING TOLL FREE...1-877-633-6772...WHEN YOU CAN DO SO SAFELY.

A TORNADO WATCH REMAINS IN EFFECT UNTIL 900 PM EDT TUESDAY EVENING
FOR SOUTHERN DELAWARE AND NEW JERSEY.

&&

LAT...LON 4027 7398 4017 7450 4061 7440 4060 7421
      4056 7420 4054 7424 4047 7425 4045 7420
      4042 7401 4048 7402 4048 7400 4040 7396
TIME...MOT...LOC 2315Z 255DEG 35KT 4093 7411 4030 7427

$$

GORSE

The office that day

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

Issued	Product	Office	Counties	Lasted
Sep 17, 8:54 PM EDT	Rip Current Statement	PHI	Atlantic, Cape May, Monmouth, Ocean	23 hr
Sep 18, 4:13 AM EDT	Coastal Flood Advisory	PHI	Burlington, Camden, Gloucester, Salem	21 hr
Sep 18, 4:21 PM EDT	Severe Thunderstorm Warning	PHI	Salem	69 min
Sep 18, 4:23 PM EDT	Severe Thunderstorm Warning	PHI	Warren	52 min
Sep 18, 4:26 PM EDT	Areal Flood Advisory	PHI	Sussex, Warren	3 hr
Sep 18, 5:01 PM EDT	Severe Thunderstorm Warning	PHI	Hunterdon, Warren	59 min
Sep 18, 5:12 PM EDT	Areal Flood Advisory	PHI	Hunterdon, Morris, Warren	63 min
Sep 18, 5:12 PM EDT	Severe Thunderstorm Warning	PHI	Camden, Gloucester	78 min
Sep 18, 5:13 PM EDT	Severe Thunderstorm Warning	PHI	Morris, Sussex, Warren	62 min
Sep 18, 5:23 PM EDT	Severe Thunderstorm Warning	PHI	Salem	52 min
Sep 18, 6:00 PM EDT	Severe Thunderstorm Warning	PHI	Burlington, Camden, Gloucester, Hunterdon, Mercer, Middlesex and 3 more	60 min
Sep 18, 6:02 PM EDT	Special Marine Warning	PHI		88 min
Sep 18, 6:06 PM EDT	Areal Flood Advisory	PHI	Burlington, Hunterdon, Mercer, Middlesex, Morris, Somerset and 2 more	54 min
Sep 18, 6:46 PM EDT	Areal Flood Advisory	PHI	Atlantic, Burlington, Camden, Cumberland, Gloucester, Salem	119 min
Sep 18, 6:54 PM EDT	Areal Flood Advisory	PHI	Burlington, Mercer, Middlesex, Monmouth, Morris, Ocean and 1 more	111 min
Sep 18, 7:04 PM EDT	Special Weather Statement	PHI	Atlantic, Burlington, Cumberland	56 min
Sep 18, 7:16 PM EDT	Areal Flood Advisory	PHI	Cape May	59 min
Sep 18, 7:51 PM EDT	Special Weather Statement	PHI	Atlantic, Cape May, Ocean	54 min
Sep 18, 7:52 PM EDT	Special Marine Warning	PHI		77 min
Sep 18, 7:56 PM EDT	Severe Thunderstorm Warning	PHI	Atlantic, Burlington, Cape May, Ocean	64 min

Nearby

Severe Thunderstorm Warnings in New Jersey, 2012 Every severe thunderstorm warning in 2012

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.