Alert archive / Louisiana / Tornado Warnings in 2011

Tornado Warning 56, NWS New Orleans, LA

April 15, 2011Washington Parish, Louisiana

NWS New Orleans, LA issued this tornado warning at Apr 15, 2011, 5:22 PM CDT for Washington Parish, Louisiana. It was in force for 23 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: Apr 15, 2011, 5:22 PM CDT (22:22 UTC)
Expired: Apr 15, 2011, 5:45 PM CDT
In force: 23 min
Issued by: NWS New Orleans, LA
Area: Storm-based polygon

County Washington Parish, LA

The watch it was issued in

The SPC watch in force over the same counties when this warning went out.

Issued	Product	Office	Lasted
Apr 15, 2:41 PM CDT	Tornado Watch	SPC	7 hr

The nearest sounding before it

Slidell Radar S, LA (KSIL), launched 12:00Z, 10.4 hours before the alert went out and 78 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: 2339 J/kg
Mixed-layer CIN: -1 J/kg
Mixed-layer LCL: 499 m above ground
0-6 km bulk shear: 50 kt
0-1 km storm-relative helicity: 325 m²/s²
0-3 km storm-relative helicity: 504 m²/s²
Significant tornado parameter: 4.8
Supercell composite: 21.3

Open this sounding in Storm Lab

The text

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

816 
WFUS54 KLIX 152222
TORLIX
LAC117-152245-
/O.NEW.KLIX.TO.W.0056.110415T2222Z-110415T2245Z/

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE NEW ORLEANS LA
522 PM CDT FRI APR 15 2011

THE NATIONAL WEATHER SERVICE IN NEW ORLEANS HAS ISSUED A

* TORNADO WARNING FOR...
  NORTHERN WASHINGTON PARISH IN SOUTHEAST LOUISIANA...
  THIS INCLUDES THE CITY OF FRANKLINTON...

* UNTIL 545 PM CDT

* AT 518 PM CDT...NATIONAL WEATHER SERVICE METEOROLOGISTS DETECTED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO NEAR
  FRANKLINTON...MOVING EAST AT 45 MPH.

* OTHER LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO
  VARNADO

PRECAUTIONARY/PREPAREDNESS ACTIONS...

IN ADDITION TO THE TORNADO...THIS STORM IS CAPABLE OF PRODUCING GOLF 
BALL SIZE OR LARGER HAIL AND DESTRUCTIVE STRAIGHT LINE WINDS.

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.

A TORNADO WATCH REMAINS IN EFFECT UNTIL 1000 PM CDT FRIDAY EVENING
FOR SOUTHEAST LOUISIANA AND SOUTHERN MISSISSIPPI.

&&

LAT...LON 3081 8982 3080 9026 3098 9028 3101 8988
      3101 8984
TIME...MOT...LOC 2221Z 264DEG 40KT 3089 9017

$$

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 14, 9:24 PM CDT	Small Craft Advisory	LIX		24 hr
Apr 15, 2:54 PM CDT	Tornado Warning	LIX	Pointe Coupee, West Feliciana	36 min
Apr 15, 3:26 PM CDT	Tornado Warning	LIX	East Feliciana, West Feliciana	34 min
Apr 15, 3:45 PM CDT	Tornado Warning	LIX	East Feliciana, Saint Helena	30 min
Apr 15, 3:52 PM CDT	Wind Advisory	LIX	Assumption, East Baton Rouge, East Feliciana, Iberville, Pointe Coupee, Saint Bernard and 5 more	6 hr
Apr 15, 3:55 PM CDT	Gale Warning	LIX		6 hr
Apr 15, 4:08 PM CDT	Severe Thunderstorm Warning	LIX	Ascension, East Baton Rouge, Iberville, Livingston, West Baton Rouge	67 min
Apr 15, 4:12 PM CDT	Severe Thunderstorm Warning	LIX	East Feliciana, Saint Helena, Tangipahoa	33 min
Apr 15, 4:56 PM CDT	Tornado Warning	LIX	Tangipahoa, Washington	34 min
Apr 15, 5:01 PM CDT	Tornado Warning	LIX	Ascension, East Baton Rouge, Iberville, Livingston, Tangipahoa	29 min
Apr 15, 5:42 PM CDT	Severe Thunderstorm Warning	LIX	Washington	48 min

Nearby

Tornado Warnings in Louisiana, 2011 Every tornado warning in 2011 Tornadoes 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.