Alert archive / Louisiana / Tornado Warnings in 2011

Tornado Warning 55, NWS New Orleans, LA

April 15, 20115 parishes in Louisiana

NWS New Orleans, LA issued this tornado warning at Apr 15, 2011, 5:01 PM CDT for 5 parishes in Louisiana. It was in force for 29 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, 5:01 PM CDT (22:01 UTC)
Expired: Apr 15, 2011, 5:30 PM CDT
In force: 29 min
Issued by: NWS New Orleans, LA
Area: Storm-based polygon

Counties Ascension Parish, LA, East Baton Rouge Parish, LA, Iberville Parish, LA, Livingston Parish, LA, Tangipahoa 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, 10.0 hours before the alert went out and 93 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.

597 
WFUS54 KLIX 152201
TORLIX
LAC005-033-047-063-105-152245-
/O.NEW.KLIX.TO.W.0055.110415T2201Z-110415T2245Z/

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

THE NATIONAL WEATHER SERVICE IN NEW ORLEANS HAS ISSUED A

* TORNADO WARNING FOR...
  NORTHERN ASCENSION PARISH IN SOUTHEAST LOUISIANA...
  THIS INCLUDES THE CITY OF GONZALES...
  SOUTHEASTERN EAST BATON ROUGE PARISH IN SOUTHEAST LOUISIANA...
  THIS INCLUDES THE CITY OF OAK HILLS PLACE...
  EAST CENTRAL IBERVILLE PARISH IN SOUTHEAST LOUISIANA...
  SOUTHERN LIVINGSTON PARISH IN SOUTHEAST LOUISIANA...
  SOUTHWESTERN TANGIPAHOA PARISH IN SOUTHEAST LOUISIANA...

* UNTIL 545 PM CDT

* AT 459 PM CDT...NATIONAL WEATHER SERVICE METEOROLOGISTS DETECTED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO NEAR
  PRAIRIEVILLE...OR 6 MILES SOUTHEAST OF OAK HILLS PLACE...MOVING
  EAST AT 40 MPH.

* OTHER LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO
  WHITEHALL...SPRINGFIELD AND PONCHATOULA

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 1000 PM CDT FRIDAY EVENING
FOR SOUTHEAST LOUISIANA AND SOUTHERN MISSISSIPPI.

&&

LAT...LON 3039 9113 3048 9044 3029 9041 3030 9044
      3031 9043 3033 9049 3027 9057 3023 9058
      3023 9063 3020 9109
TIME...MOT...LOC 2201Z 263DEG 34KT 3030 9099

$$

2 follow-up statements

166 
WWUS54 KLIX 152222
SVSLIX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE NEW ORLEANS LA
522 PM CDT FRI APR 15 2011

LAC033-047-152232-
/O.CAN.KLIX.TO.W.0055.000000T0000Z-110415T2245Z/
IBERVILLE LA-EAST BATON ROUGE LA-
522 PM CDT FRI APR 15 2011

...THE TORNADO WARNING FOR SOUTHEASTERN EAST BATON ROUGE AND EAST
CENTRAL IBERVILLE PARISHES IS CANCELLED...

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

LAT...LON 3031 9044 3032 9044 3033 9049 3027 9057
      3027 9066 3026 9085 3042 9091 3048 9045
      3029 9041 3030 9043 3030 9044 3031 9043
TIME...MOT...LOC 2222Z 263DEG 34KT 3032 9076

$$

LAC005-063-105-152245-
/O.CON.KLIX.TO.W.0055.000000T0000Z-110415T2245Z/
LIVINGSTON LA-TANGIPAHOA LA-ASCENSION LA-
522 PM CDT FRI APR 15 2011

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 545 PM CDT FOR NORTH
CENTRAL ASCENSION...SOUTHWESTERN TANGIPAHOA AND SOUTHERN LIVINGSTON
PARISHES...

AT 518 PM CDT...NATIONAL WEATHER SERVICE METEOROLOGISTS CONTINUED TO
DETECT A TORNADO.  THIS TORNADO WAS LOCATED 7 MILES WEST OF
WHITEHALL...OR 10 MILES NORTHEAST OF GONZALES...MOVING EAST AT 40
MPH.

OTHER LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO
KILLIAN...SPRINGFIELD AND PONCHATOULA

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 1000 PM CDT FRIDAY EVENING
FOR SOUTHEAST LOUISIANA AND SOUTHERN MISSISSIPPI.

&&

LAT...LON 3031 9044 3032 9044 3033 9049 3027 9057
      3027 9066 3026 9085 3042 9091 3048 9045
      3029 9041 3030 9043 3030 9044 3031 9043
TIME...MOT...LOC 2222Z 263DEG 34KT 3032 9076

$$

22/TD

684 
WWUS54 KLIX 152230
SVSLIX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE NEW ORLEANS LA
530 PM CDT FRI APR 15 2011

LAC005-063-105-152240-
/O.CAN.KLIX.TO.W.0055.000000T0000Z-110415T2245Z/
LIVINGSTON LA-TANGIPAHOA LA-ASCENSION LA-
530 PM CDT FRI APR 15 2011

...THE TORNADO WARNING FOR NORTH CENTRAL ASCENSION...SOUTHWESTERN
TANGIPAHOA AND SOUTHERN LIVINGSTON PARISHES IS CANCELLED...

THE THUNDERSTORM THAT PROMPTED THE TORNADO WARNING HAS WEAKENED 
STEADILY OVER THE LAST 30 MINUTES...AND ROTATION WAS WEAK. 

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

LAT...LON 3031 9044 3032 9044 3033 9049 3027 9057
      3027 9066 3026 9085 3042 9091 3048 9045
      3029 9041 3030 9043 3030 9044 3031 9043
TIME...MOT...LOC 2229Z 263DEG 32KT 3039 9072

$$

22/TD

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, 5:22 PM CDT	Tornado Warning	LIX	Washington	23 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.