Alert archive / New Jersey / Severe Thunderstorm Warnings in 2011

Severe Thunderstorm Warning 212, NWS Philadelphia/Mount Holly

July 29, 2011Burlington County, Ocean County, New Jersey

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Jul 29, 2011, 8:27 PM EDT for Burlington County, Ocean County, New Jersey. It was in force for 18 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued: Jul 29, 2011, 8:27 PM EDT (00:27 UTC)
Expired: Jul 29, 2011, 8:45 PM EDT
In force: 18 min
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon

Counties Burlington County, NJ, Ocean County, NJ

The radar

The Philadelphia radar (KDIX), 30 km from the middle of the area, began a volume at 00:28 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.

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 00:00Z, 0.5 hours before the alert went out and 167 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: 863 J/kg
Mixed-layer CIN: -77 J/kg
Mixed-layer LCL: 499 m above ground
0-6 km bulk shear: 41 kt
0-1 km storm-relative helicity: 206 m²/s²
0-3 km storm-relative helicity: 354 m²/s²
Significant tornado parameter: 0.7
Supercell composite: 7.3

Open this sounding in Storm Lab

The text

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

917 
WUUS51 KPHI 300027
SVRPHI
NJC005-029-300045-
/O.NEW.KPHI.SV.W.0212.110730T0027Z-110730T0045Z/

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

THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  SOUTHEASTERN BURLINGTON COUNTY IN SOUTHERN NEW JERSEY...
  SOUTHERN OCEAN COUNTY IN SOUTHERN NEW JERSEY...

* UNTIL 845 PM EDT

* AT 824 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING DAMAGING WINDS IN EXCESS
  OF 60 MPH.  THIS STORM WAS LOCATED NEAR BASS RIVER STATE FOREST...
  OR 22 MILES NORTH OF ATLANTIC CITY...AND MOVING SOUTHEAST AT 50
  MPH.

* THE SEVERE THUNDERSTORM WILL BE NEAR...
  NORTH BEACH HAVEN...BEACH HAVEN...SURF CITY AND 7 MILES SOUTHWEST
  OF HARVEY CEDARS AROUND 835 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 SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 1100 PM EDT
FRIDAY EVENING FOR NEW JERSEY AND EASTERN PENNSYLVANIA.

&&

LAT...LON 3978 7408 3968 7412 3951 7426 3950 7428
      3960 7451 3985 7433 3985 7413 3976 7418
      3972 7415 3975 7412 3977 7415 3977 7412
      3980 7413 3982 7410 3985 7410 3985 7407
TIME...MOT...LOC 0026Z 296DEG 43KT 3965 7432

$$

SZATKOWSKI

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 29, 8:01 PM EDT	Special Weather Statement	PHI	Burlington, Mercer, Ocean	59 min
Jul 29, 8:21 PM EDT	Special Marine Warning	PHI		84 min
Jul 29, 8:34 PM EDT	Severe Thunderstorm Warning	PHI	Burlington, Ocean	44 min
Jul 29, 8:57 PM EDT	Special Weather Statement	PHI	Atlantic	63 min
Jul 29, 9:13 PM EDT	Severe Thunderstorm Warning	PHI	Atlantic, Burlington, Ocean	62 min
Jul 29, 9:15 PM EDT	Special Marine Warning	PHI		60 min
Jul 29, 9:34 PM EDT	Special Marine Warning	PHI		56 min
Jul 29, 10:31 PM EDT	Special Marine Warning	PHI		59 min
Jul 30, 4:15 PM EDT	Coastal Flood Statement	PHI	Atlantic, Cape May, Ocean	7 hr

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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.