Alert archive / Louisiana / Tornado Warnings in 2011

Tornado Warning 161, NWS New Orleans, LA

November 16, 2011Livingston Parish, Saint Helena Parish, Tangipahoa Parish, Louisiana

NWS New Orleans, LA issued this tornado warning at Nov 16, 2011, 3:33 AM CST for Livingston Parish, Saint Helena Parish, Tangipahoa Parish, Louisiana. It was in force for 42 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: Nov 16, 2011, 3:33 AM CST (09:33 UTC)
Expired: Nov 16, 2011, 4:15 AM CST
In force: 42 min
Issued by: NWS New Orleans, LA
Area: Storm-based polygon

Counties Livingston Parish, LA, Saint Helena 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
Nov 16, 2:20 AM CST	Tornado Watch	SPC	8 hr
Nov 16, 2:49 AM CST	Tornado Watch	SPC	7 hr

The nearest sounding before it

Slidell Radar S, LA (KSIL), launched 00:00Z, 9.6 hours before the alert went out and 89 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: 1734 J/kg
Mixed-layer CIN: -8 J/kg
Mixed-layer LCL: 661 m above ground
0-6 km bulk shear: 58 kt
0-1 km storm-relative helicity: 116 m²/s²
0-3 km storm-relative helicity: 166 m²/s²
Significant tornado parameter: 1.4
Supercell composite: 8.1

Open this sounding in Storm Lab

The text

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

159 
WFUS54 KLIX 160933
TORLIX
LAC063-091-105-161015-
/O.NEW.KLIX.TO.W.0161.111116T0933Z-111116T1015Z/

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE NEW ORLEANS LA
333 AM CST WED NOV 16 2011

THE NATIONAL WEATHER SERVICE IN NEW ORLEANS HAS ISSUED A

* TORNADO WARNING FOR...
  CENTRAL LIVINGSTON PARISH IN SOUTHEAST LOUISIANA...
  SOUTHEASTERN ST. HELENA PARISH IN SOUTHEAST LOUISIANA...
  NORTHERN TANGIPAHOA PARISH IN SOUTHEAST LOUISIANA...
  THIS INCLUDES THE CITY OF AMITE...

* UNTIL 415 AM CST

* AT 327 AM CST...NATIONAL WEATHER SERVICE METEOROLOGISTS DETECTED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO 6 MILES SOUTH OF
  MONTPELIER...OR 12 MILES SOUTHWEST OF AMITE...MOVING NORTHEAST AT
  30 MPH.

* OTHER LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO
  INDEPENDENCE...ROSELAND AND WILMER

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 ALSO REMAINS IN EFFECT UNTIL 1000 AM CST WEDNESDAY 
MORNING FOR SOUTHEAST LOUISIANA AND SOUTHERN MISSISSIPPI.

&&

LAT...LON 3091 9035 3089 9032 3084 9029 3082 9029
      3081 9029 3077 9026 3074 9026 3048 9061
      3061 9076 3100 9035
TIME...MOT...LOC 0931Z 226DEG 28KT 3062 9060

$$

1 follow-up statement

041 
WWUS54 KLIX 160947
SVSLIX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE NEW ORLEANS LA
347 AM CST WED NOV 16 2011

LAC063-091-160957-
/O.CAN.KLIX.TO.W.0161.000000T0000Z-111116T1015Z/
ST. HELENA LA-LIVINGSTON LA-
347 AM CST WED NOV 16 2011

...THE TORNADO WARNING FOR CENTRAL LIVINGSTON AND SOUTHEASTERN ST.
HELENA PARISHES IS CANCELLED...

A TORNADO WATCH REMAINS IN EFFECT UNTIL 1000 AM CST WEDNESDAY MORNING
FOR SOUTHERN MISSISSIPPI. A TORNADO WATCH ALSO REMAINS IN EFFECT
UNTIL 1000 AM CST WEDNESDAY MORNING FOR SOUTHEAST LOUISIANA AND
SOUTHERN MISSISSIPPI.

LAT...LON 3096 9035 3091 9035 3084 9029 3079 9028
      3066 9055 3071 9057 3072 9056
TIME...MOT...LOC 0947Z 223DEG 34KT 3075 9047

$$

LAC105-161015-
/O.CON.KLIX.TO.W.0161.000000T0000Z-111116T1015Z/
TANGIPAHOA LA-
347 AM CST WED NOV 16 2011

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 415 AM CST FOR NORTHERN
TANGIPAHOA PARISH...

AT 344 AM CST...NATIONAL WEATHER SERVICE METEOROLOGISTS CONTINUED TO
DETECT A TORNADO.  THIS TORNADO WAS LOCATED NEAR AMITE...MOVING
NORTHEAST AT 40 MPH.

THE TORNADO WILL BE NEAR...
  WILMER BY 400 AM CST...

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 AM CST WEDNESDAY MORNING
FOR SOUTHERN MISSISSIPPI. A TORNADO WATCH ALSO REMAINS IN EFFECT
UNTIL 1000 AM CST WEDNESDAY MORNING FOR SOUTHEAST LOUISIANA AND
SOUTHERN MISSISSIPPI.

&&

LAT...LON 3096 9035 3091 9035 3084 9029 3079 9028
      3066 9055 3071 9057 3072 9056
TIME...MOT...LOC 0947Z 223DEG 34KT 3075 9047

$$

The office that day

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

Issued	Product	Office	Counties	Lasted
Nov 16, 2:28 AM CST	Tornado Warning	LIX	Saint Helena, Tangipahoa	47 min
Nov 16, 2:38 AM CST	Special Marine Warning	LIX		52 min
Nov 16, 4:09 AM CST	Tornado Warning	LIX	Washington	36 min
Nov 16, 4:18 AM CST	Tornado Warning	LIX	Jefferson, Saint Charles	42 min
Nov 16, 4:52 AM CST	Tornado Warning	LIX	Lafourche, Terrebonne	23 min
Nov 16, 4:53 AM CST	Tornado Warning	LIX	Jefferson, Orleans, Saint Charles	37 min
Nov 16, 4:57 AM CST	Special Marine Warning	LIX		48 min
Nov 16, 5:21 AM CST	Tornado Warning	LIX	Lafourche, Saint Charles	39 min
Nov 16, 5:37 AM CST	Special Marine Warning	LIX		23 min
Nov 16, 6:15 AM CST	Severe Thunderstorm Warning	LIX	Saint Tammany	60 min
Nov 16, 7:22 AM CST	Severe Thunderstorm Warning	LIX	Jefferson, Lafourche, Plaquemines	68 min
Nov 16, 7:41 AM CST	Special Marine Warning	LIX		2 hr
Nov 16, 10:29 AM CST	Special Marine Warning	LIX		61 min
Nov 16, 10:30 AM CST	Special Marine Warning	LIX		90 min
Nov 16, 10:31 AM CST	Small Craft Advisory	LIX		46 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.