Alert archive / New Jersey / Severe Thunderstorm Warnings in 2011

Severe Thunderstorm Warning 165, NWS Philadelphia/Mount Holly

July 8, 20116 counties in New Jersey

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Jul 8, 2011, 3:51 PM EDT for 6 counties in New Jersey. It was in force for 69 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: Jul 8, 2011, 3:51 PM EDT (19:51 UTC)
Expired: Jul 8, 2011, 5:00 PM EDT
In force: 69 min
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon

Counties Hunterdon County, NJ, Middlesex County, NJ, Morris County, NJ, Somerset County, NJ, Sussex County, NJ, Warren County, NJ

The radar

The Philadelphia radar (KDIX), 89 km from the middle of the area, began a volume at 19:52 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
Jul 8, 4:03 PM EDT	TSTM WND DMG	Bound Brook, NJ	LARGE BRANCHES REPORTED DOWN WITH MINOR PROPERTY DAMAGE.
Jul 8, 4:18 PM EDT	TSTM WND DMG	Morristown, NJ	TREE DOWN ON EXIT RAMP OF I-287 EXIT 37
Jul 8, 5:04 PM EDT	TSTM WND DMG	Sparta, NJ	TREES DOWN IN THE STILLWATER - SPARTA AREA

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
Jul 8, 1:51 PM EDT	Severe Thunderstorm Watch	SPC	7 hr

The nearest sounding before it

Brookhaven, NY (KOKX), launched 12:00Z, 7.9 hours before the alert went out and 129 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: 745 J/kg
Mixed-layer CIN: -72 J/kg
Mixed-layer LCL: 849 m above ground
0-6 km bulk shear: 30 kt
0-1 km storm-relative helicity: 43 m²/s²
0-3 km storm-relative helicity: 86 m²/s²
Significant tornado parameter: 0.1
Supercell composite: 2.0

Open this sounding in Storm Lab

The text

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

185 
WUUS51 KPHI 081951
SVRPHI
NJC019-023-027-035-037-041-082100-
/O.NEW.KPHI.SV.W.0165.110708T1951Z-110708T2100Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
351 PM EDT FRI JUL 8 2011

THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  NORTHERN MIDDLESEX COUNTY IN NORTHERN NEW JERSEY...
  THIS INCLUDES THE CITIES OF...PERTH AMBOY...NEW BRUNSWICK...
  MORRIS COUNTY IN NORTHERN NEW JERSEY...
  THIS INCLUDES THE CITY OF MORRISTOWN...
  SOMERSET COUNTY IN NORTHERN NEW JERSEY...
  THIS INCLUDES THE CITY OF SOMERVILLE...
  EASTERN HUNTERDON COUNTY IN NORTHWEST NEW JERSEY...
  SOUTHERN SUSSEX COUNTY IN NORTHWEST NEW JERSEY...
  THIS INCLUDES THE CITY OF NEWTON...
  NORTHEASTERN WARREN COUNTY IN NORTHWEST NEW JERSEY...

* UNTIL 500 PM EDT

* AT 348 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
  COLONIA...OR 6 MILES NORTHWEST OF PERTH AMBOY...AND MOVING NORTH AT
  35 MPH.

* THE SEVERE THUNDERSTORM WILL BE NEAR...
  CHATHAM AND 6 MILES EAST OF MADISON AROUND 405 PM EDT...
  FLORHAM PARK AROUND 410 PM EDT...
  EAST HANOVER AROUND 415 PM EDT...
  LINCOLN PARK AND PEQUANNOCK TOWNSHIP AROUND 430 PM EDT...
  RIVERDALE AND BUTLER AROUND 435 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...HEAVY RAIN WILL OCCUR
WITH THESE STORMS AND CAUSE LOW-LYING AND POOR DRAINAGE FLOODING.

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 SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 900 PM EDT FRIDAY
EVENING FOR DELAWARE AND NORTHEASTERN MARYLAND AND NEW JERSEY AND
EASTERN PENNSYLVANIA.

&&

LAT...LON 4059 7420 4055 7424 4047 7427 4045 7422
      4038 7427 4043 7486 4105 7494 4112 7445
      4104 7449 4105 7444 4101 7439 4099 7429
      4090 7427 4089 7433 4086 7431 4074 7436
      4066 7445 4066 7443 4066 7440 4059 7444
TIME...MOT...LOC 1951Z 190DEG 30KT 4062 7433

$$

NIERENBERG

1 follow-up statement

645 
WWUS51 KPHI 082048
SVSPHI

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
448 PM EDT FRI JUL 8 2011

NJC019-023-035-082058-
/O.CAN.KPHI.SV.W.0165.000000T0000Z-110708T2100Z/
HUNTERDON NJ-SOMERSET NJ-MIDDLESEX NJ-
448 PM EDT FRI JUL 8 2011

...THE SEVERE THUNDERSTORM WARNING FOR NORTHERN MIDDLESEX...SOMERSET
AND EASTERN HUNTERDON COUNTIES IS CANCELLED...

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 900 PM EDT FRIDAY
EVENING FOR DELAWARE AND NORTHEASTERN MARYLAND AND NEW JERSEY AND
EASTERN PENNSYLVANIA.

LAT...LON 4089 7433 4086 7431 4078 7437 4073 7436
      4069 7444 4075 7456 4073 7475 4105 7494
      4112 7446 4108 7449 4104 7449 4105 7444
      4102 7442 4099 7429 4090 7427
TIME...MOT...LOC 2048Z 190DEG 30KT 4109 7422

$$

NJC027-037-041-082100-
/O.CON.KPHI.SV.W.0165.000000T0000Z-110708T2100Z/
SUSSEX NJ-WARREN NJ-MORRIS NJ-
448 PM EDT FRI JUL 8 2011

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 500 PM EDT
FOR MORRIS...NORTHEASTERN WARREN AND SOUTHERN SUSSEX COUNTIES...

AT 443 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 6 MILES NORTHEAST OF RIVERDALE...OR 10 MILES NORTH OF
PATERSON...MOVING NORTH AT 35 MPH.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 900 PM EDT FRIDAY
EVENING FOR DELAWARE AND NORTHEASTERN MARYLAND AND NEW JERSEY AND
EASTERN PENNSYLVANIA.

&&

LAT...LON 4089 7433 4086 7431 4078 7437 4073 7436
      4069 7444 4075 7456 4073 7475 4105 7494
      4112 7446 4108 7449 4104 7449 4105 7444
      4102 7442 4099 7429 4090 7427
TIME...MOT...LOC 2048Z 190DEG 30KT 4109 7422

$$

NIERENBERG

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 7, 8:40 PM EDT	Severe Thunderstorm Warning	PHI	Atlantic, Cape May, Cumberland	80 min
Jul 7, 8:42 PM EDT	Special Marine Warning	PHI		2 hr
Jul 7, 10:07 PM EDT	Special Weather Statement	PHI	Cape May	53 min
Jul 7, 10:55 PM EDT	Severe Thunderstorm Warning	PHI	Warren	28 min
Jul 8, 3:58 AM EDT	Flash Flood Watch	PHI	Atlantic, Burlington, Camden, Cape May, Cumberland, Gloucester and 10 more	19 hr
Jul 8, 4:34 AM EDT	Special Weather Statement	PHI	Hunterdon	56 min
Jul 8, 12:03 PM EDT	Special Weather Statement	PHI	Atlantic	57 min
Jul 8, 12:56 PM EDT	Special Weather Statement	PHI	Atlantic, Camden, Gloucester	64 min
Jul 8, 2:12 PM EDT	Special Weather Statement	PHI	Atlantic, Burlington, Camden, Cumberland, Gloucester, Salem	93 min
Jul 8, 2:23 PM EDT	Special Weather Statement	PHI	Warren	82 min
Jul 8, 2:25 PM EDT	Areal Flood Advisory	PHI	Burlington, Camden, Gloucester, Salem	7 hr
Jul 8, 2:51 PM EDT	Severe Thunderstorm Warning	PHI	Hunterdon, Mercer, Warren	54 min
Jul 8, 2:56 PM EDT	Areal Flood Advisory	PHI	Hunterdon, Mercer	3 hr
Jul 8, 3:03 PM EDT	Special Weather Statement	PHI	Mercer	57 min
Jul 8, 3:14 PM EDT	Severe Thunderstorm Warning	PHI	Hunterdon, Mercer, Middlesex, Somerset	66 min
Jul 8, 3:33 PM EDT	Areal Flood Advisory	PHI	Mercer, Middlesex, Somerset	3 hr
Jul 8, 3:44 PM EDT	Severe Thunderstorm Warning	PHI	Hunterdon, Warren	76 min
Jul 8, 3:48 PM EDT	Flash Flood Warning	PHI	Camden	3 hr
Jul 8, 4:10 PM EDT	Flash Flood Warning	PHI	Hunterdon, Morris, Somerset, Sussex, Warren	3 hr
Jul 8, 4:42 PM EDT	Severe Thunderstorm Warning	PHI	Morris, Sussex, Warren	78 min
Jul 8, 4:50 PM EDT	Severe Thunderstorm Warning	PHI	Atlantic, Burlington, Camden	70 min
Jul 8, 5:03 PM EDT	Flash Flood Warning	PHI	Sussex	117 min
Jul 8, 5:03 PM EDT	Tornado Warning	PHI	Atlantic, Burlington, Camden	27 min
Jul 8, 5:33 PM EDT	Areal Flood Advisory	PHI	Atlantic, Burlington, Camden, Cumberland, Gloucester, Mercer and 4 more	3 hr
Jul 8, 5:44 PM EDT	Flash Flood Warning	PHI	Camden, Gloucester, Salem	3 hr
Jul 8, 6:32 PM EDT	Special Marine Warning	PHI		58 min
Jul 8, 7:13 PM EDT	Severe Thunderstorm Warning	PHI	Atlantic, Burlington, Cape May, Cumberland, Ocean	77 min
Jul 8, 7:24 PM EDT	Areal Flood Advisory	PHI	Atlantic, Burlington, Cape May, Cumberland, Monmouth, Ocean	3 hr
Jul 8, 7:26 PM EDT	Special Marine Warning	PHI		64 min
Jul 8, 7:50 PM EDT	Special Marine Warning	PHI		55 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.