Alert archive / New Jersey / Severe Thunderstorm Warnings in 2013

Severe Thunderstorm Warning 2, NWS Philadelphia/Mount Holly

January 31, 20134 counties in New Jersey

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Jan 31, 2013, 3:34 AM EST for 4 counties in New Jersey. It was in force for 56 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
Jan 31, 2013, 3:34 AM EST (08:34 UTC)
Expired
Jan 31, 2013, 4:30 AM EST
In force
56 min
Issued by
NWS Philadelphia/Mount Holly
Area
Storm-based polygon

Counties Hunterdon County, NJ, Mercer County, NJ, Morris County, NJ, Somerset County, NJ

The radar

The Philadelphia radar (KDIX), 79 km from the middle of the area, began a volume at 08:37 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

TimeReportWhereRemark
Jan 31, 3:37 AM ESTTSTM WND DMGLawrence Twp, NJTREES AND WIRES DOWN IN LAWRENCE TWP... INCLUDING ALONG PRINCETON PIKE.
Jan 31, 3:41 AM ESTTSTM WND DMGHamilton Twp, NJTREES AND WIRES DOWN IN HAMILTON TWP.

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The nearest sounding before it

Brookhaven, NY (KOKX), launched 00:00Z, 8.6 hours before the alert went out and 141 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-pSkew-T log-p diagram, Brookhaven, NY at 00:00Z on 2013-01-31Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Brookhaven, NY at 00:00Z on 2013-01-31The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 430 square meters per square second.1939587897Sfc1 km3 km6 km9 kmRMLM
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
514 m above ground
0-6 km bulk shear
61 kt
0-1 km storm-relative helicity
430 m²/s²
0-3 km storm-relative helicity
420 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.

653 
WUUS51 KPHI 310834
SVRPHI
NJC019-021-027-035-310930-
/O.NEW.KPHI.SV.W.0002.130131T0834Z-130131T0930Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
334 AM EST THU JAN 31 2013

THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  MERCER COUNTY IN CENTRAL NEW JERSEY...
  THIS INCLUDES THE CITY OF TRENTON...
  MORRIS COUNTY IN NORTHERN NEW JERSEY...
  SOMERSET COUNTY IN NORTHERN NEW JERSEY...
  THIS INCLUDES THE CITY OF SOMERVILLE...
  EASTERN HUNTERDON COUNTY IN NORTHWEST NEW JERSEY...

* UNTIL 430 AM EST

* AT 332 AM EST...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 GREEN POND TO 13 MILES SOUTHWEST OF TRENTON...OR ALONG A LINE
  EXTENDING FROM 6 MILES SOUTHWEST OF WEST MILFORD TO 13 MILES
  SOUTHWEST OF TRENTON...AND MOVING EAST AT 40 MPH.

* SEVERE THUNDERSTORMS WILL BE NEAR...
  PARSIPPANY...MILLSTONE...MERCERVILLE-HAMILTON SQUARE AND MANVILLE
  AROUND 340 AM EST...
  SOMERSET...PEQUANNOCK TOWNSHIP...EAST HANOVER AND RIVERDALE AROUND
  345 AM EST...
  WINDSOR AND HIGHTSTOWN AROUND 350 AM EST...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

THIS IS A DANGEROUS STORM. IF YOU ARE IN ITS PATH...PREPARE
IMMEDIATELY FOR DAMAGING WINDS...LARGE HAIL...AND DEADLY CLOUD TO
GROUND LIGHTNING. PEOPLE OUTSIDE SHOULD MOVE TO A SHELTER...
PREFERABLY INSIDE A STRONG BUILDING BUT AWAY FROM WINDOWS.

IN ADDITION TO LARGE HAIL AND DAMAGING WINDS...HEAVY RAIN WILL OCCUR
WITH THESE STORMS AND CAUSE LOW-LYING AND POOR DRAINAGE FLOODING.

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.

&&

LAT...LON 4090 7433 4074 7436 4067 7445 4067 7439
      4062 7442 4057 7453 4049 7446 4037 7463
      4033 7463 4025 7448 4015 7463 4027 7486
      4042 7479 4043 7475 4076 7480 4109 7450
      4104 7450 4105 7445 4100 7430 4091 7427
TIME...MOT...LOC 0834Z 275DEG 36KT 4103 7442 4006 7485

$$

HAYES
1 follow-up statement
943 
WWUS51 KPHI 310901
SVSPHI

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
401 AM EST THU JAN 31 2013

NJC019-021-027-035-310911-
/O.CAN.KPHI.SV.W.0002.000000T0000Z-130131T0930Z/
HUNTERDON NJ-MERCER NJ-MORRIS NJ-SOMERSET NJ-
401 AM EST THU JAN 31 2013

...THE SEVERE THUNDERSTORM WARNING FOR SOMERSET...MORRIS...MERCER AND
EASTERN HUNTERDON COUNTIES IS CANCELLED...

THE LINE OF THUNDERSTORMS THAT PROMPTED THE WARNING HAS MOVED OUT OF 
THE AREA.

LAT...LON 4090 7433 4074 7436 4067 7445 4067 7439
      4062 7442 4057 7453 4049 7446 4037 7463
      4033 7463 4025 7448 4015 7463 4027 7486
      4042 7479 4043 7475 4076 7480 4109 7450
      4104 7450 4105 7445 4100 7430 4091 7427
TIME...MOT...LOC 0901Z 275DEG 36KT 4053 7409 3959 7462

$$

HAYES

The office that day

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

IssuedProductOfficeCountiesLasted
Jan 30, 9:12 PM ESTSpecial Weather StatementPHISalem2 hr
Jan 30, 9:36 PM ESTSpecial Weather StatementPHIBurlington, Camden, Gloucester, Mercer114 min
Jan 30, 9:50 PM ESTSpecial Weather StatementPHIHunterdon, Mercer, Middlesex, Somerset115 min
Jan 30, 10:38 PM ESTSpecial Weather StatementPHIAtlantic, Cape May, Cumberland, Monmouth, Ocean2 hr
Jan 30, 11:29 PM ESTSpecial Weather StatementPHIBurlington, Camden, Hunterdon, Mercer, Middlesex, Somerset2 hr
Jan 31, 12:34 AM ESTSpecial Weather StatementPHISussex, Warren116 min
Jan 31, 12:42 AM ESTSpecial Weather StatementPHIAtlantic, Burlington, Cape May, Cumberland, Monmouth, Ocean2 hr
Jan 31, 1:34 AM ESTSpecial Weather StatementPHICamden, Gloucester, Hunterdon, Mercer, Middlesex, Morris and 2 more116 min
Jan 31, 2:06 AM ESTAreal Flood AdvisoryPHIHunterdon, Sussex, Warren4 hr
Jan 31, 2:12 AM ESTSpecial Weather StatementPHICape May, Cumberland63 min
Jan 31, 2:20 AM ESTSpecial Weather StatementPHISussex, Warren55 min
Jan 31, 2:56 AM ESTAreal Flood AdvisoryPHIBurlington, Camden, Gloucester, Hunterdon, Mercer, Salem4 hr
Jan 31, 3:12 AM ESTAreal Flood AdvisoryPHIAtlantic, Burlington, Camden, Cape May, Cumberland, Gloucester and 2 more4 hr
Jan 31, 3:15 AM ESTSpecial Weather StatementPHIAtlantic, Burlington, Camden, Cape May, Cumberland, Gloucester and 8 more2 hr
Jan 31, 3:16 AM ESTAreal Flood AdvisoryPHIHunterdon, Middlesex, Morris, Somerset, Sussex, Warren11 hr
Jan 31, 4:04 AM ESTSpecial Marine WarningPHI86 min
Jan 31, 4:58 AM ESTAreal Flood WarningPHIHunterdon9 hr
Jan 31, 5:20 AM ESTAreal Flood WarningPHIMorris9 hr
Jan 31, 6:01 AM ESTWind AdvisoryPHIAtlantic, Burlington, Camden, Cape May, Cumberland, Gloucester and 10 more12 hr
Jan 31, 10:07 AM ESTAreal Flood WarningPHIWarren13 hr
Jan 31, 6:56 PM ESTSpecial Weather StatementPHIHunterdon, Somerset94 min

Nearby

Severe Thunderstorm Warnings in New Jersey, 2013Every 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.