Alert archive / Louisiana / Tornado Warnings in 2011

Tornado Warning 169, NWS New Orleans, LA

December 22, 2011Lafourche Parish, Saint Charles Parish, Terrebonne Parish, Louisiana

NWS New Orleans, LA issued this tornado warning at Dec 22, 2011, 10:10 AM CST for Lafourche Parish, Saint Charles Parish, Terrebonne Parish, Louisiana. It was in force for 15 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: Dec 22, 2011, 10:10 AM CST (16:10 UTC)
Expired: Dec 22, 2011, 10:25 AM CST
In force: 15 min
Issued by: NWS New Orleans, LA
Area: Storm-based polygon

Counties Lafourche Parish, LA, Saint Charles Parish, LA, Terrebonne 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
Dec 22, 4:36 AM CST	Tornado Watch	SPC	7 hr

The nearest sounding before it

Slidell Radar S, LA (KSIL), launched 12:00Z, 4.2 hours before the alert went out and 109 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: 578 J/kg
Mixed-layer CIN: -18 J/kg
Mixed-layer LCL: 476 m above ground
0-6 km bulk shear: 58 kt
0-1 km storm-relative helicity: 244 m²/s²
0-3 km storm-relative helicity: 297 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 3.4

Open this sounding in Storm Lab

The text

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

347 
WFUS54 KLIX 221610
TORLIX
LAC057-089-109-221645-
/O.NEW.KLIX.TO.W.0169.111222T1610Z-111222T1645Z/

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE NEW ORLEANS LA
1010 AM CST THU DEC 22 2011

THE NATIONAL WEATHER SERVICE IN NEW ORLEANS HAS ISSUED A

* TORNADO WARNING FOR...
  NORTHERN LAFOURCHE PARISH IN SOUTHEAST LOUISIANA...
  SOUTHERN ST. CHARLES PARISH IN SOUTHEAST LOUISIANA...
  EAST CENTRAL TERREBONNE PARISH IN SOUTHEAST LOUISIANA...
  THIS INCLUDES THE CITY OF HOUMA...

* UNTIL 1045 AM CST

* AT 1010 AM CST...NATIONAL WEATHER SERVICE METEOROLOGISTS WERE
  TRACKING A TORNADO NEAR HOUMA...MOVING NORTHEAST AT 45 MPH.

* OTHER LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO
  LOCKPORT...RACELAND...MATHEWS AND DES ALLEMANDS

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 500 PM CST THURSDAY AFTERNOON
FOR SOUTHEAST LOUISIANA AND SOUTHERN MISSISSIPPI.

&&

LAT...LON 2955 9075 2989 9047 2966 9018 2946 9067
TIME...MOT...LOC 1610Z 227DEG 38KT 2955 9065

$$

7/ARM

2 follow-up statements

891 
WWUS54 KLIX 221617
SVSLIX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE NEW ORLEANS LA
1017 AM CST THU DEC 22 2011

LAC057-089-109-221645-
/O.CON.KLIX.TO.W.0169.000000T0000Z-111222T1645Z/
ST. CHARLES LA-TERREBONNE LA-LAFOURCHE LA-
1017 AM CST THU DEC 22 2011

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 1045 AM CST FOR NORTHERN
LAFOURCHE...NORTHEASTERN TERREBONNE AND SOUTHERN ST. CHARLES
PARISHES...

AT 1018 AM CST...NATIONAL WEATHER SERVICE METEOROLOGISTS CONTINUED TO
DETECT A TORNADO.  THIS TORNADO WAS LOCATED 6 MILES SOUTHWEST OF
LOCKPORT...OR 6 MILES EAST OF HOUMA...MOVING NORTHEAST AT 45 MPH.

OTHER LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO
RACELAND...MATHEWS AND DES ALLEMANDS

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 PM CST THURSDAY AFTERNOON
FOR SOUTHEAST LOUISIANA AND SOUTHERN MISSISSIPPI. A TORNADO WATCH
ALSO REMAINS IN EFFECT UNTIL 500 PM CST THURSDAY AFTERNOON FOR
SOUTHEAST LOUISIANA AND SOUTHERN MISSISSIPPI.

&&

LAT...LON 2951 9058 2962 9068 2989 9047 2966 9018
TIME...MOT...LOC 1618Z 227DEG 38KT 2960 9057

$$

7/ARM

759 
WWUS54 KLIX 221625
SVSLIX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE NEW ORLEANS LA
1025 AM CST THU DEC 22 2011

LAC057-089-109-221635-
/O.CAN.KLIX.TO.W.0169.000000T0000Z-111222T1645Z/
ST. CHARLES LA-TERREBONNE LA-LAFOURCHE LA-
1025 AM CST THU DEC 22 2011

...THE TORNADO WARNING FOR NORTHERN LAFOURCHE...NORTHEASTERN
TERREBONNE AND SOUTHERN ST. CHARLES PARISHES IS CANCELLED...

A TORNADO WATCH REMAINS IN EFFECT UNTIL 100 PM CST THURSDAY AFTERNOON
FOR SOUTHEAST LOUISIANA AND SOUTHERN MISSISSIPPI. A TORNADO WATCH
ALSO REMAINS IN EFFECT UNTIL 500 PM CST THURSDAY AFTERNOON FOR
SOUTHEAST LOUISIANA AND SOUTHERN MISSISSIPPI.

LAT...LON 2951 9058 2962 9068 2989 9047 2966 9018
TIME...MOT...LOC 1625Z 227DEG 38KT 2965 9051

$$

7/ARM

The office that day

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

Issued	Product	Office	Counties	Lasted
Dec 22, 3:47 AM CST	Small Craft Advisory	LIX		14 hr
Dec 22, 7:38 AM CST	Severe Thunderstorm Warning	LIX	Ascension, Assumption, East Baton Rouge, East Feliciana, Iberville, Livingston and 5 more	52 min
Dec 22, 8:28 AM CST	Severe Thunderstorm Warning	LIX	East Feliciana, Saint Helena	36 min
Dec 22, 8:57 AM CST	Severe Thunderstorm Warning	LIX	Ascension, Assumption, Iberville, Lafourche, Livingston, Saint James and 2 more	63 min
Dec 22, 9:07 AM CST	Special Marine Warning	LIX		113 min
Dec 22, 9:07 AM CST	Severe Thunderstorm Warning	LIX	Ascension, Livingston, Saint Helena, Saint John the Baptist, Saint Tammany, Tangipahoa and 1 more	53 min
Dec 22, 9:14 AM CST	Special Marine Warning	LIX		31 min
Dec 22, 9:52 AM CST	Severe Thunderstorm Warning	LIX	Jefferson, Lafourche, Livingston, Orleans, Saint Charles, Saint James and 3 more	53 min
Dec 22, 9:56 AM CST	Special Marine Warning	LIX		64 min
Dec 22, 10:08 AM CST	Tornado Warning	LIX	Saint Tammany, Tangipahoa	22 min
Dec 22, 10:43 AM CST	Special Marine Warning	LIX		2 hr
Dec 22, 10:57 AM CST	Special Marine Warning	LIX		33 min
Dec 22, 11:04 AM CST	Severe Thunderstorm Warning	LIX	Saint Tammany, Washington	40 min
Dec 22, 11:30 AM CST	Special Marine Warning	LIX		2 hr
Dec 22, 1:24 PM CST	Special Marine Warning	LIX		2 hr

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.