Alert archive / New Jersey / Severe Thunderstorm Warnings in 2011

Severe Thunderstorm Warning 156, NWS Philadelphia/Mount Holly

July 7, 2011Hunterdon County, Middlesex County, Somerset County, New Jersey

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Jul 7, 2011, 6:46 PM EDT for Hunterdon County, Middlesex County, Somerset County, New Jersey. It was in force for 74 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: Jul 7, 2011, 6:46 PM EDT (22:46 UTC)
Expired: Jul 7, 2011, 8:00 PM EDT
In force: 74 min
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon

Counties Hunterdon County, NJ, Middlesex County, NJ, Somerset County, NJ

The radar

The Philadelphia radar (KDIX), 66 km from the middle of the area, began a volume at 22:46 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
Jul 7, 7:20 PM EDT	HAIL 1	Whitehouse Station, NJ	PENNY UP TO QUARTER SIZE HAIL REPORTED.

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, 10.8 hours before the alert went out and 159 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: 1080 J/kg
Mixed-layer CIN: -88 J/kg
Mixed-layer LCL: 1033 m above ground
0-6 km bulk shear: 29 kt
0-1 km storm-relative helicity: 36 m²/s²
0-3 km storm-relative helicity: 68 m²/s²
Significant tornado parameter: 0.1
Supercell composite: 0.4

Open this sounding in Storm Lab

The text

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

365 
WUUS51 KPHI 072246
SVRPHI
NJC019-023-035-080000-
/O.NEW.KPHI.SV.W.0156.110707T2246Z-110708T0000Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
646 PM EDT THU JUL 7 2011

THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  NORTHWESTERN MIDDLESEX COUNTY IN NORTHERN NEW JERSEY...
  SOMERSET COUNTY IN NORTHERN NEW JERSEY...
  THIS INCLUDES THE CITY OF SOMERVILLE...
  CENTRAL HUNTERDON COUNTY IN NORTHWEST NEW JERSEY...

* UNTIL 800 PM EDT

* AT 642 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
  ANNANDALE...OR 14 MILES WEST OF SOMERVILLE...AND MOVING SOUTHEAST
  AT 15 MPH.

* THE SEVERE THUNDERSTORM WILL BE NEAR...
  WHITE HOUSE STATION AROUND 700 PM EDT...
  CLOVERHILL AROUND 720 PM EDT...
  FLAGTOWN AROUND 730 PM EDT...
  SOMERVILLE AROUND 735 PM EDT...
  BELLE MEAD AND MANVILLE AROUND 745 PM EDT...
  MILLSTONE AROUND 750 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.

IN ADDITION TO LARGE HAIL AND DAMAGING WINDS...CONTINUOUS CLOUD TO
GROUND LIGHTNING IS OCCURRING WITH THIS STORM. MOVE INDOORS
IMMEDIATELY! LIGHTNING IS ONE OF NATURES GREATEST KILLERS.
REMEMBER...IF YOU CAN HEAR THUNDER...YOU ARE CLOSE ENOUGH TO BE
STRUCK BY LIGHTNING.

&&

LAT...LON 4038 7462 4039 7466 4058 7501 4070 7483
      4056 7439
TIME...MOT...LOC 2246Z 304DEG 13KT 4060 7486

$$

NIERENBERG

1 follow-up statement

604 
WWUS51 KPHI 072328
SVSPHI

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
728 PM EDT THU JUL 7 2011

NJC019-072337-
/O.CAN.KPHI.SV.W.0156.000000T0000Z-110708T0000Z/
HUNTERDON NJ-
728 PM EDT THU JUL 7 2011

...THE SEVERE THUNDERSTORM WARNING FOR CENTRAL HUNTERDON COUNTY IS
CANCELLED...

THE SEVERE THUNDERSTORM IS NOW IN SOMERSET COUNTY.

LAT...LON 4049 7477 4063 7465 4056 7439 4038 7462
      4039 7466
TIME...MOT...LOC 2327Z 304DEG 13KT 4052 7470

$$

NJC023-035-080000-
/O.CON.KPHI.SV.W.0156.000000T0000Z-110708T0000Z/
SOMERSET NJ-MIDDLESEX NJ-
728 PM EDT THU JUL 7 2011

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 800 PM EDT
FOR NORTHWESTERN MIDDLESEX AND SOUTHERN SOMERSET COUNTIES...

AT 724 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 NEAR FLAGTOWN...OR 6 MILES SOUTHWEST OF SOMERVILLE...MOVING 
SOUTHEAST AT 15 MPH. THIS STORM PRODUCED QUARTER SIZE HAIL IN 
WHITEHOUSE STATION WHILE IT WAS IN HUNTERDON COUNTY.

THE SEVERE THUNDERSTORM WILL BE NEAR...
  6 MILES SOUTHWEST OF SOMERVILLE BY 735 PM EDT...
  BELLE MEAD AND MANVILLE BY 740 PM EDT...
  MILLSTONE BY 750 PM EDT...
  ROCKY HILL BY 755 PM EDT...
  SOMERSET BY 800 PM EDT...

LAT...LON 4049 7477 4063 7465 4056 7439 4038 7462
      4039 7466
TIME...MOT...LOC 2327Z 304DEG 13KT 4052 7470

$$
 
TFG

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 7, 1:27 PM EDT	Special Weather Statement	PHI	Burlington	93 min
Jul 7, 3:11 PM EDT	Special Weather Statement	PHI	Atlantic	64 min
Jul 7, 3:15 PM EDT	Severe Thunderstorm Warning	PHI	Atlantic, Burlington, Ocean	45 min
Jul 7, 3:16 PM EDT	Special Marine Warning	PHI		89 min
Jul 7, 3:26 PM EDT	Severe Thunderstorm Warning	PHI	Warren	64 min
Jul 7, 3:45 PM EDT	Special Weather Statement	PHI	Mercer, Middlesex	90 min
Jul 7, 3:46 PM EDT	Special Weather Statement	PHI	Burlington	89 min
Jul 7, 3:58 PM EDT	Severe Thunderstorm Warning	PHI	Atlantic, Burlington, Ocean	34 min
Jul 7, 4:17 PM EDT	Severe Thunderstorm Warning	PHI	Burlington, Ocean	88 min
Jul 7, 4:19 PM EDT	Severe Thunderstorm Warning	PHI	Morris, Sussex, Warren	46 min
Jul 7, 4:48 PM EDT	Severe Thunderstorm Warning	PHI	Monmouth, Ocean	57 min
Jul 7, 5:12 PM EDT	Severe Thunderstorm Warning	PHI	Camden, Gloucester	63 min
Jul 7, 5:44 PM EDT	Special Weather Statement	PHI	Burlington, Monmouth, Ocean	61 min
Jul 7, 6:10 PM EDT	Severe Thunderstorm Warning	PHI	Burlington, Camden, Gloucester	40 min
Jul 7, 6:48 PM EDT	Special Weather Statement	PHI	Camden	57 min
Jul 7, 7:32 PM EDT	Special Weather Statement	PHI	Atlantic, Burlington, Cape May, Cumberland, Salem	88 min
Jul 7, 7:49 PM EDT	Special Weather Statement	PHI	Mercer	86 min

Nearby

Severe Thunderstorm Warnings in New Jersey, 2011 Every severe thunderstorm warning in 2011

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.