Alert archive / Louisiana / Tornado Warnings in 2012

Tornado Warning 45, NWS New Orleans, LA

August 22, 2012Jefferson Parish, Plaquemines Parish, Louisiana

NWS New Orleans, LA issued this tornado warning at Aug 22, 2012, 3:33 PM CDT for Jefferson Parish, Plaquemines Parish, Louisiana. It was in force for 27 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: Aug 22, 2012, 3:33 PM CDT (20:33 UTC)
Expired: Aug 22, 2012, 4:00 PM CDT
In force: 27 min
Issued by: NWS New Orleans, LA
Area: Storm-based polygon

Counties Jefferson Parish, LA, Plaquemines Parish, LA

The nearest sounding before it

Slidell Radar S, LA (KSIL), launched 12:00Z, 8.6 hours before the alert went out and 108 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: 157 J/kg
Mixed-layer CIN: -117 J/kg
Mixed-layer LCL: 1379 m above ground
0-6 km bulk shear: 26 kt
0-1 km storm-relative helicity: 5 m²/s²
0-3 km storm-relative helicity: 64 m²/s²
Significant tornado parameter: 0.0
Supercell composite: -0.1

Open this sounding in Storm Lab

The text

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

135 
WFUS54 KLIX 222033
TORLIX
LAC051-075-222100-
/O.NEW.KLIX.TO.W.0045.120822T2033Z-120822T2100Z/

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE NEW ORLEANS LA
333 PM CDT WED AUG 22 2012

THE NATIONAL WEATHER SERVICE IN NEW ORLEANS HAS ISSUED A

* TORNADO WARNING FOR...
  EXTREME SOUTHEASTERN JEFFERSON PARISH IN SOUTHEAST LOUISIANA...
  WEST CENTRAL PLAQUEMINES PARISH IN SOUTHEAST LOUISIANA...

* UNTIL 400 PM CDT

* AT 332 PM CDT...NATIONAL WEATHER SERVICE METEOROLOGISTS DETECTED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO NEAR GRAND ISLE
  CMAN...OR 20 MILES SOUTHWEST OF PORT SULPHUR...MOVING SOUTH AT 10
  MPH.

* THE SEVERE THUNDERSTORM WILL OTHERWISE REMAIN OVER MAINLY RURAL
  AREAS OF THE INDICATED PARISH.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

THE SAFEST PLACE TO BE DURING A TORNADO IS UNDER A WORKBENCH OR OTHER
PIECE OF STURDY FURNITURE. SEEK SHELTER ON THE LOWEST FLOOR OF THE
BUILDING IN AN INTERIOR HALLWAY OR ROOM SUCH AS A CLOSET. USE
BLANKETS OR PILLOWS TO COVER YOUR BODY AND ALWAYS STAY AWAY FROM
WINDOWS.

IF IN MOBILE HOMES OR VEHICLES...EVACUATE THEM AND GET INSIDE A
SUBSTANTIAL SHELTER. IF NO SHELTER IS AVAILABLE...LIE FLAT IN THE
NEAREST DITCH OR OTHER LOW SPOT AND COVER YOUR HEAD WITH YOUR HANDS.

PLEASE FOLLOW OUR OFFICE ON BOTH FACEBOOK AND TWITTER FOR MORE
INFORMATION ON SEVERE WEATHER AND TO RELAY WEATHER REPORTS AND
PHOTOS.

&&

LAT...LON 2921 9005 2926 8999 2931 8999 2934 9002
      2938 9000 2935 8996 2928 8995 2930 8991
      2932 8992 2935 8988 2938 8987 2938 8983
      2935 8986 2930 8985 2929 8992 2919 9004
TIME...MOT...LOC 2034Z 017DEG 10KT 2930 8997

$$

MJH

The office that day

Everything else NWS New Orleans, LA issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Aug 22, 3:22 PM CDT	Special Marine Warning	LIX		38 min
Aug 22, 3:57 PM CDT	Special Marine Warning	LIX		63 min

Nearby

Tornado Warnings in Louisiana, 2012 Every tornado warning in 2012 Tornadoes in 2012

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.