Alert archive / New Jersey / Severe Thunderstorm Warnings in 2011

Severe Thunderstorm Warning 209, NWS Philadelphia/Mount Holly

July 29, 20115 counties in New Jersey; Bucks County, Pennsylvania

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Jul 29, 2011, 7:03 PM EDT for 5 counties in New Jersey; Bucks County, Pennsylvania. It was in force for 46 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 29, 2011, 7:03 PM EDT (23:03 UTC)
Expired: Jul 29, 2011, 7:49 PM EDT
In force: 46 min
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon

Counties Burlington County, NJ, Mercer County, NJ, Middlesex County, NJ, Monmouth County, NJ, Ocean County, NJ, Bucks County, PA

The radar

The Philadelphia radar (KDIX), 39 km from the middle of the area, began a volume at 23:04 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 29, 7:15 PM EDT	TSTM WND DMG	Willingboro, NJ	NUMEROUS TREES AND WIRES DOWN.
Jul 29, 7:31 PM EDT	TSTM WND DMG	Willingboro, NJ	TREES DOWN.
Jul 29, 7:42 PM EDT	TSTM WND GST 54	Mcguire Afb, NJ	A THUNDERSTORM WIND GUST TO 54 MPH WAS MEASURED AT THE MCGUIRE AFB.

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 29, 2:40 PM EDT	Severe Thunderstorm Watch	SPC	8 hr

The nearest sounding before it

Brookhaven, NY (KOKX), launched 12:00Z, 11.1 hours before the alert went out and 143 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: 81 J/kg
Mixed-layer CIN: -109 J/kg
Mixed-layer LCL: 569 m above ground
0-6 km bulk shear: 26 kt
0-1 km storm-relative helicity: 8 m²/s²
0-3 km storm-relative helicity: 19 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.

015 
WUUS51 KPHI 292303
SVRPHI
NJC005-021-023-025-029-PAC017-300000-
/O.NEW.KPHI.SV.W.0209.110729T2303Z-110730T0000Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
703 PM EDT FRI JUL 29 2011

THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  SOUTHERN MERCER COUNTY IN CENTRAL NEW JERSEY...
  THIS INCLUDES THE CITY OF TRENTON...
  MONMOUTH COUNTY IN CENTRAL NEW JERSEY...
  THIS INCLUDES THE CITY OF SANDY HOOK...
  SOUTHERN MIDDLESEX COUNTY IN NORTHERN NEW JERSEY...
  SOUTHEASTERN BUCKS COUNTY IN SOUTHEAST PENNSYLVANIA...
  NORTHERN BURLINGTON COUNTY IN SOUTHERN NEW JERSEY...
  NORTHWESTERN OCEAN COUNTY IN SOUTHERN NEW JERSEY...

* UNTIL 800 PM EDT

* AT 700 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 SAYREVILLE TO BENSALEM...OR ALONG A LINE EXTENDING FROM PERTH
  AMBOY TO 11 MILES SOUTHWEST OF TRENTON...AND MOVING EAST AT 45 MPH.

* SEVERE THUNDERSTORMS WILL BE NEAR...
  LUMBERTON...MOUNT HOLLY...WINDSOR AND WHITE HORSE AROUND 710 PM
  EDT...
  JACKSONVILLE...MORGANVILLE...YORKETOWN AND TWIN RIVERS AROUND 715
  PM EDT...
  JOBSTOWN AND WRIGHTSTOWN AROUND 720 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.

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 1100 PM EDT FRIDAY EVENING
FOR NORTHWEST NEW JERSEY AND NORTHEAST PENNSYLVANIA. A SEVERE
THUNDERSTORM WATCH ALSO REMAINS IN EFFECT UNTIL 1100 PM EDT FRIDAY
EVENING FOR NEW JERSEY AND EASTERN PENNSYLVANIA.

&&

LAT...LON 3992 7464 4001 7505 4003 7499 4008 7497
      4013 7499 4050 7434 4050 7427 4047 7427
      4044 7420 4046 7412 4042 7399 4044 7402
      4047 7400 4047 7399 4041 7396 4032 7396
TIME...MOT...LOC 2301Z 270DEG 38KT 4045 7428 4013 7491

$$

SZATKOWSKI

1 follow-up statement

941 
WWUS51 KPHI 292349
SVSPHI

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
749 PM EDT FRI JUL 29 2011

NJC005-021-023-025-029-PAC017-292357-
/O.CAN.KPHI.SV.W.0209.000000T0000Z-110730T0000Z/
MERCER NJ-MIDDLESEX NJ-BUCKS PA-MONMOUTH NJ-OCEAN NJ-BURLINGTON NJ-
749 PM EDT FRI JUL 29 2011

...THE SEVERE THUNDERSTORM WARNING FOR NORTHERN BURLINGTON...
NORTHWESTERN OCEAN...MONMOUTH...SOUTHEASTERN BUCKS...SOUTHERN
MIDDLESEX AND SOUTHERN MERCER COUNTIES IS CANCELLED...

A SEVERE THUNDERSTORM WARNING CONTINUES FOR EASTERN MONMOUTH...OCEAN 
AND BURLINGTON COUNTIES.

A TORNADO WATCH REMAINS IN EFFECT UNTIL 1100 PM EDT FRIDAY EVENING
FOR NORTHWEST NEW JERSEY AND NORTHEAST PENNSYLVANIA. A SEVERE
THUNDERSTORM WATCH ALSO REMAINS IN EFFECT UNTIL 1100 PM EDT FRIDAY
EVENING FOR NEW JERSEY AND EASTERN PENNSYLVANIA.

LAT...LON 3992 7464 4001 7505 4003 7499 4008 7497
      4013 7499 4050 7434 4050 7427 4047 7427
      4044 7420 4046 7412 4042 7399 4044 7402
      4047 7400 4047 7399 4041 7396 4032 7396
TIME...MOT...LOC 2347Z 270DEG 38KT 4045 7364 4013 7427

$$

SZATKOWSKI

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 29, 2:42 AM EDT	Special Weather Statement	PHI	Atlantic, Burlington, Camden, Cumberland, Middlesex, Monmouth and 1 more	63 min
Jul 29, 3:45 AM EDT	Special Weather Statement	PHI	Atlantic, Burlington, Camden, Cumberland, Ocean	60 min
Jul 29, 5:12 PM EDT	Special Weather Statement	PHI	Hunterdon, Morris, Somerset, Sussex, Warren	108 min
Jul 29, 5:59 PM EDT	Severe Thunderstorm Warning	PHI	Sussex	61 min
Jul 29, 6:17 PM EDT	Special Weather Statement	PHI	Monmouth	58 min
Jul 29, 6:23 PM EDT	Special Marine Warning	PHI		97 min
Jul 29, 6:24 PM EDT	Severe Thunderstorm Warning	PHI	Monmouth, Ocean	66 min
Jul 29, 6:25 PM EDT	Severe Thunderstorm Warning	PHI	Middlesex	20 min
Jul 29, 7:14 PM EDT	Severe Thunderstorm Warning	PHI	Burlington	42 min
Jul 29, 7:27 PM EDT	Severe Thunderstorm Warning	PHI	Burlington, Monmouth, Ocean	63 min
Jul 29, 7:40 PM EDT	Special Marine Warning	PHI		95 min
Jul 29, 3:44 PM EDT	Special Weather Statement	PHI	Berks, Carbon, Lehigh, Monroe, Northampton	2 hr
Jul 29, 4:40 PM EDT	Severe Thunderstorm Warning	PHI	Berks, Lehigh	65 min
Jul 29, 5:56 PM EDT	Special Weather Statement	PHI	Bucks	64 min
Jul 29, 6:05 PM EDT	Severe Thunderstorm Warning	PHI	Bucks, Montgomery	55 min
Jul 29, 6:43 PM EDT	Severe Thunderstorm Warning	PHI	Philadelphia	49 min
Jul 29, 7:13 PM EDT	Special Weather Statement	PHI	Montgomery	62 min
Jul 29, 7:31 PM EDT	Special Weather Statement	PHI	Bucks, Montgomery, Philadelphia	59 min

Nearby

Severe Thunderstorm Warnings in New Jersey, 2011 Severe Thunderstorm Warnings in Pennsylvania, 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.