Alert archive / Louisiana / Tornado Warnings in 2011

Tornado Warning 43, NWS New Orleans, LA

April 4, 20115 parishes in Louisiana

NWS New Orleans, LA issued this tornado warning at Apr 4, 2011, 7:37 PM CDT for 5 parishes in 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 4, 2011, 7:37 PM CDT (00:37 UTC)
Expired: Apr 4, 2011, 8:00 PM CDT
In force: 23 min
Issued by: NWS New Orleans, LA
Area: Storm-based polygon

Counties Jefferson Parish, LA, Orleans Parish, LA, Plaquemines Parish, LA, Saint Bernard Parish, LA, Saint Charles 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 4, 5:28 PM CDT	Tornado Watch	SPC	7 hr

The nearest sounding before it

Slidell Radar S, LA (KSIL), launched 00:00Z, 0.6 hours before the alert went out and 48 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: 3275 J/kg
Mixed-layer CIN: 0 J/kg
Mixed-layer LCL: 562 m above ground
0-6 km bulk shear: 44 kt
0-1 km storm-relative helicity: 245 m²/s²
0-3 km storm-relative helicity: 249 m²/s²
Significant tornado parameter: 4.7
Supercell composite: 20.4

Open this sounding in Storm Lab

The text

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

001 
WFUS54 KLIX 050037
TORLIX
LAC051-071-075-087-089-050100-
/O.NEW.KLIX.TO.W.0043.110405T0037Z-110405T0100Z/

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE NEW ORLEANS LA
737 PM CDT MON APR 4 2011

THE NATIONAL WEATHER SERVICE IN NEW ORLEANS HAS ISSUED A

* TORNADO WARNING FOR...
  NORTHERN JEFFERSON PARISH IN SOUTHEAST LOUISIANA...
  THIS INCLUDES THE CITIES OF...TIMBERLANE...MARRERO...HARVEY...
  AVONDALE...
  SOUTHWESTERN ORLEANS PARISH IN SOUTHEAST LOUISIANA...
  THIS INCLUDES THE CITY OF NEW ORLEANS...
  NORTHWESTERN PLAQUEMINES PARISH IN SOUTHEAST LOUISIANA...
  THIS INCLUDES THE CITY OF BELLE CHASSE...
  SOUTHWESTERN ST. BERNARD PARISH IN SOUTHEAST LOUISIANA...
  THIS INCLUDES THE CITY OF CHALMETTE...
  SOUTHEASTERN ST. CHARLES PARISH IN SOUTHEAST LOUISIANA...

* UNTIL 800 PM CDT

* AT 735 PM CDT...NATIONAL WEATHER SERVICE METEOROLOGISTS DETECTED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO NEAR MARRERO...
  MOVING EAST AT 35 MPH.

* OTHER LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO JEAN
  LAFITTE...GRETNA...TERRYTOWN...VIOLET AND YSCLOSKEY

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.

A TORNADO WATCH REMAINS IN EFFECT UNTIL 100 AM CDT TUESDAY MORNING
FOR SOUTHEAST LOUISIANA AND SOUTHERN MISSISSIPPI.

&&

LAT...LON 2977 9027 3003 9015 2994 8972 2992 8972
      2989 8970 2988 8966 2989 8961 2991 8959
      2990 8955 2975 8963 2958 8968 2952 8968
TIME...MOT...LOC 0037Z 284DEG 29KT 2988 9012

$$

95/DM

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 4, 7:00 PM CDT	Tornado Warning	LIX	Saint Tammany	45 min
Apr 4, 7:17 PM CDT	Severe Thunderstorm Warning	LIX	Jefferson, Lafourche, Saint Charles, Saint James, Saint John the Baptist	43 min
Apr 4, 7:32 PM CDT	Severe Thunderstorm Warning	LIX	Jefferson, Orleans, Plaquemines, Saint Bernard	43 min
Apr 4, 7:39 PM CDT	Special Marine Warning	LIX		2 hr
Apr 4, 7:42 PM CDT	Tornado Warning	LIX	Saint Tammany	48 min
Apr 4, 7:45 PM CDT	Special Marine Warning	LIX		30 min
Apr 4, 7:47 PM CDT	Severe Thunderstorm Warning	LIX	Saint Tammany	73 min
Apr 4, 7:48 PM CDT	Wind Advisory	LIX		11 hr
Apr 4, 7:55 PM CDT	Tornado Warning	LIX	Plaquemines, Saint Bernard	35 min
Apr 4, 8:08 PM CDT	Special Marine Warning	LIX		97 min
Apr 4, 8:16 PM CDT	Severe Thunderstorm Warning	LIX	Jefferson, Plaquemines, Saint Bernard	44 min
Apr 4, 8:49 PM CDT	Severe Thunderstorm Warning	LIX	Plaquemines	71 min
Apr 4, 9:52 PM CDT	Special Marine Warning	LIX		83 min
Apr 4, 10:58 PM CDT	Special Marine Warning	LIX		92 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.