Alert archive / Louisiana / Tornado Warnings in 2011

Tornado Warning 73, NWS New Orleans, LA

September 2, 2011Lafourche Parish, Terrebonne Parish, Louisiana

NWS New Orleans, LA issued this tornado warning at Sep 2, 2011, 4:29 PM CDT for Lafourche Parish, Terrebonne Parish, Louisiana. It was in force for 31 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: Sep 2, 2011, 4:29 PM CDT (21:29 UTC)
Expired: Sep 2, 2011, 5:00 PM CDT
In force: 31 min
Issued by: NWS New Orleans, LA
Area: Storm-based polygon

Counties Lafourche Parish, LA, Terrebonne Parish, LA

The nearest sounding before it

Slidell Radar S, LA (KSIL), launched 12:00Z, 9.5 hours before the alert went out and 120 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: 1468 J/kg
Mixed-layer CIN: -5 J/kg
Mixed-layer LCL: 482 m above ground
0-6 km bulk shear: 29 kt
0-1 km storm-relative helicity: -13 m²/s²
0-3 km storm-relative helicity: -20 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

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

882 
WFUS54 KLIX 022129
TORLIX
LAC057-109-022200-
/O.NEW.KLIX.TO.W.0073.110902T2129Z-110902T2200Z/

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE NEW ORLEANS LA
429 PM CDT FRI SEP 2 2011

THE NATIONAL WEATHER SERVICE IN NEW ORLEANS HAS ISSUED A

* TORNADO WARNING FOR...
  SOUTHEASTERN LAFOURCHE PARISH IN SOUTHEAST LOUISIANA...
  THIS INCLUDES THE CITIES OF...LAROSE...GALLIANO...CUT OFF...
  EAST CENTRAL TERREBONNE PARISH IN SOUTHEAST LOUISIANA...

* UNTIL 500 PM CDT

* AT 423 PM CDT...NATIONAL WEATHER SERVICE METEOROLOGISTS DETECTED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO 8 MILES EAST OF
  LEEVILLE...OR 18 MILES SOUTHEAST OF GALLIANO...MOVING NORTHWEST AT
  40 MPH.

* OTHER LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO
  GOLDEN MEADOW...MONTEGUT...DULAC AND CHAUVIN

PRECAUTIONARY/PREPAREDNESS ACTIONS...

HEAVY RAINFALL MAY OBSCURE THIS TORNADO. TAKE COVER NOW! IF YOU WAIT 
TO SEE OR HEAR IT COMING...IT MAY BE TOO LATE TO GET TO A SAFE PLACE.

IF YOU ARE CAUGHT OUTSIDE...SEEK SHELTER IN A NEARBY REINFORCED
BUILDING. AS A LAST RESORT...SEEK SHELTER IN A CULVERT...DITCH OR LOW
SPOT AND COVER YOUR HEAD WITH YOUR HANDS.

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.

&&

LAT...LON 2927 9035 2923 9041 2931 9041 2931 9042
      2931 9045 2927 9052 2937 9073 2971 9048
      2940 9003 2935 9004 2934 9002 2911 9015
TIME...MOT...LOC 2128Z 117DEG 36KT 2929 9013

$$

95/DM

The office that day

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

Issued	Product	Office	Counties	Lasted
Sep 1, 7:02 PM CDT	Tropical Storm Warning	LIX	Assumption, East Baton Rouge, East Feliciana, Iberville, Pointe Coupee, Saint Bernard and 7 more	3 days
Sep 2, 11:11 AM CDT	River Flood Warning	LIX	Tangipahoa	6 days
Sep 2, 11:11 AM CDT	River Flood Warning	LIX	Saint Tammany	6 days
Sep 2, 11:16 AM CDT	River Flood Warning	LIX	St. Mary	3 days
Sep 2, 12:53 PM CDT	Special Marine Warning	LIX		37 min
Sep 2, 1:35 PM CDT	Special Marine Warning	LIX		25 min
Sep 2, 3:21 PM CDT	Special Marine Warning	LIX		24 min
Sep 2, 3:38 PM CDT	Special Marine Warning	LIX		37 min
Sep 2, 3:44 PM CDT	Tornado Warning	LIX	Jefferson, Lafourche	46 min
Sep 2, 4:57 PM CDT	Tornado Warning	LIX	Saint Bernard	33 min
Sep 2, 5:08 PM CDT	Special Marine Warning	LIX		22 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.