Alert archive / Louisiana / Tornado Warnings in 2011

Tornado Warning 164, NWS New Orleans, LA

November 16, 2011Lafourche Parish, Terrebonne Parish, Louisiana

NWS New Orleans, LA issued this tornado warning at Nov 16, 2011, 4:52 AM CST for Lafourche Parish, Terrebonne 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: Nov 16, 2011, 4:52 AM CST (10:52 UTC)
Expired: Nov 16, 2011, 5:15 AM CST
In force: 23 min
Issued by: NWS New Orleans, LA
Area: Storm-based polygon

Counties Lafourche 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
Nov 16, 2:49 AM CST	Tornado Watch	SPC	7 hr

The nearest sounding before it

Slidell Radar S, LA (KSIL), launched 00:00Z, 10.9 hours before the alert went out and 101 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.

241 
WFUS54 KLIX 161052
TORLIX
LAC057-109-161115-
/O.NEW.KLIX.TO.W.0164.111116T1052Z-111116T1115Z/

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

THE NATIONAL WEATHER SERVICE IN NEW ORLEANS HAS ISSUED A

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

* UNTIL 515 AM CST

* AT 451 AM CST...NATIONAL WEATHER SERVICE METEOROLOGISTS DETECTED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO 8 MILES
  SOUTHWEST OF HOUMA...MOVING NORTHEAST AT 30 MPH.

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

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 2936 9079 2950 9092 2984 9048 2983 9047
      2981 9047 2979 9045 2976 9037 2974 9036
      2971 9036 2969 9035 2969 9024
TIME...MOT...LOC 1052Z 232DEG 28KT 2949 9077

$$

1 follow-up statement

814 
WWUS54 KLIX 161113
SVSLIX

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

LAC057-109-161123-
/O.EXP.KLIX.TO.W.0164.000000T0000Z-111116T1115Z/
TERREBONNE LA-LAFOURCHE LA-
513 AM CST WED NOV 16 2011

...THE TORNADO WARNING FOR CENTRAL LAFOURCHE AND CENTRAL TERREBONNE
PARISHES WILL EXPIRE AT 515 AM CST...

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 2936 9079 2950 9092 2984 9048 2983 9047
      2981 9047 2979 9045 2976 9037 2974 9036
      2971 9036 2969 9035 2969 9024
TIME...MOT...LOC 1113Z 232DEG 28KT 2962 9061

$$

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, 3:33 AM CST	Tornado Warning	LIX	Livingston, Saint Helena, Tangipahoa	42 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, 4:53 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.