Alert archive / New Jersey / Severe Thunderstorm Warnings in 2013

Severe Thunderstorm Warning 11, NWS Philadelphia/Mount Holly

May 11, 2013Middlesex County, Morris County, Somerset County, New Jersey

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at May 11, 2013, 3:03 PM EDT for Middlesex County, Morris County, Somerset County, New Jersey. It was in force for 42 min. 3 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: May 11, 2013, 3:03 PM EDT (19:03 UTC)
Expired: May 11, 2013, 3:45 PM EDT
In force: 42 min
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon

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

The radar

The Philadelphia radar (KDIX), 74 km from the middle of the area, began a volume at 19:06 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
May 11, 3:10 PM EDT	TSTM WND DMG	Bernards Twp, NJ	TREES DOWN.
May 11, 3:15 PM EDT	TSTM WND DMG	Harding Twp, NJ	TREES DOWN.
May 11, 3:20 PM EDT	TSTM WND DMG	Watchung, NJ	TREES DOWN.

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 12:00Z, 7.1 hours before the alert went out and 139 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: 1000 m above ground
0-6 km bulk shear: 44 kt
0-1 km storm-relative helicity: 284 m²/s²
0-3 km storm-relative helicity: 293 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.

861 
WUUS51 KPHI 111903
SVRPHI
NJC023-027-035-111945-
/O.NEW.KPHI.SV.W.0011.130511T1903Z-130511T1945Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
303 PM EDT SAT MAY 11 2013

THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  NORTHEASTERN MIDDLESEX COUNTY IN NORTHERN NEW JERSEY...
  THIS INCLUDES THE CITIES OF...NEW BRUNSWICK...SOUTH AMBOY...PERTH
  AMBOY...
  SOUTH CENTRAL MORRIS COUNTY IN NORTHERN NEW JERSEY...
  SOMERSET COUNTY IN NORTHERN NEW JERSEY...
  THIS INCLUDES THE CITY OF SOMERVILLE...

* UNTIL 345 PM EDT

* AT 258 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE HAIL...AND
  DAMAGING WINDS IN EXCESS OF 60 MPH.  THIS STORM WAS LOCATED NEAR
  BRIDGEWATER...AND MOVING EAST AT 35 MPH.

* THE SEVERE THUNDERSTORM WILL BE NEAR...
  MARTINSVILLE...FAR HILLS AND BOUND BROOK AROUND 310 PM EDT...
  MILLINGTON...BASKING RIDGE AND MIDDLESEX AROUND 315 PM EDT...
  CHATHAM AND 6 MILES NORTH OF COLONIA AROUND 330 PM EDT...

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.

&&

LAT...LON 4055 7424 4048 7426 4048 7478 4050 7478
      4057 7472 4062 7470 4064 7473 4072 7472
      4079 7436 4073 7437 4068 7445 4065 7440
      4060 7444 4060 7421 4056 7421
TIME...MOT...LOC 1902Z 258DEG 32KT 4062 7467

$$

IOVINO

1 follow-up statement

758 
WWUS51 KPHI 111919
SVSPHI

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
319 PM EDT SAT MAY 11 2013

NJC023-027-035-111945-
/O.CON.KPHI.SV.W.0011.000000T0000Z-130511T1945Z/
MORRIS NJ-SOMERSET NJ-MIDDLESEX NJ-
319 PM EDT SAT MAY 11 2013

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 345 PM EDT
FOR NORTHEASTERN MIDDLESEX...NORTHERN SOMERSET AND SOUTH CENTRAL
MORRIS COUNTIES...

AT 315 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
INDICATE A SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE
HAIL...AND DAMAGING WINDS IN EXCESS OF 60 MPH.  THIS STORM WAS 
LOCATED FROM HARDING TOWNSHIP TO WARREN TOWNSHIP TO AROUND MANVILLE 
AND BOUND BROOK...MOVING EAST AT 35 MPH.

THE SEVERE THUNDERSTORM WILL BE NEAR...
  SOUTH PLAINFIELD AND CHATHAM BY 320 PM EDT...
  EDISON AND WOODBRIDGE BY 345 PM EDT...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4055 7424 4048 7427 4048 7478 4049 7478
      4075 7458 4077 7449 4078 7436 4073 7437
      4068 7445 4066 7445 4067 7443 4065 7440
      4060 7444 4060 7421 4056 7421
TIME...MOT...LOC 1916Z 258DEG 32KT 4064 7451

$$

IOVINO

The office that day

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

Issued	Product	Office	Counties	Lasted
May 11, 2:03 PM EDT	Areal Flood Advisory	PHI	Hunterdon, Warren	117 min
May 11, 2:24 PM EDT	Special Weather Statement	PHI	Hunterdon	36 min
May 11, 2:44 PM EDT	Areal Flood Advisory	PHI	Hunterdon, Morris, Somerset	2 hr
May 11, 2:49 PM EDT	Special Weather Statement	PHI	Hunterdon, Somerset	41 min
May 11, 3:15 PM EDT	Special Weather Statement	PHI	Camden, Cumberland, Gloucester	60 min
May 11, 3:37 PM EDT	Areal Flood Advisory	PHI	Atlantic, Camden, Cumberland, Gloucester, Salem	3 hr
May 11, 3:44 PM EDT	Small Craft Advisory	PHI		24 hr
May 11, 3:54 PM EDT	Severe Thunderstorm Warning	PHI	Atlantic, Burlington, Camden, Gloucester	66 min
May 11, 4:13 PM EDT	Special Weather Statement	PHI	Monmouth, Ocean	62 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.