Alert archive / Louisiana / Tornado Warnings in 2011

Tornado Warning 41, NWS New Orleans, LA

April 4, 20115 parishes in Louisiana

NWS New Orleans, LA issued this tornado warning at Apr 4, 2011, 6:47 PM CDT for 5 parishes in Louisiana. It was in force for 28 min. 1 report came from inside the area while it was in force.

The area

The outline as issued, with what was reported inside it.

The facts

Issued: Apr 4, 2011, 6:47 PM CDT (23:47 UTC)
Expired: Apr 4, 2011, 7:15 PM CDT
In force: 28 min
Issued by: NWS New Orleans, LA
Area: Storm-based polygon

Counties Assumption Parish, LA, Lafourche Parish, LA, Saint Charles Parish, LA, Saint James Parish, LA, Saint John the Baptist Parish, LA

What was reported inside it

Time	Report	Where	Remark
Apr 4, 7:17 PM CDT	TSTM WND DMG	6 Nne Thibodaux, LA	BRANCH FELL THROUGH A TRAILER ON CHOCTAW RD.

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

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 4, 5:28 PM CDT	Tornado Watch	SPC	7 hr

The nearest sounding before it

Slidell Radar S, LA (KSIL), launched 12:00Z, 11.8 hours before the alert went out and 97 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: 1669 J/kg
Mixed-layer CIN: -67 J/kg
Mixed-layer LCL: 624 m above ground
0-6 km bulk shear: 17 kt
0-1 km storm-relative helicity: 88 m²/s²
0-3 km storm-relative helicity: 245 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.

208 
WFUS54 KLIX 042347
TORLIX
LAC007-057-089-093-095-050015-
/O.NEW.KLIX.TO.W.0041.110404T2347Z-110405T0015Z/

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE NEW ORLEANS LA
647 PM CDT MON APR 4 2011

THE NATIONAL WEATHER SERVICE IN NEW ORLEANS HAS ISSUED A

* TORNADO WARNING FOR...
  EAST CENTRAL ASSUMPTION PARISH IN SOUTHEAST LOUISIANA...
  NORTHWESTERN LAFOURCHE PARISH IN SOUTHEAST LOUISIANA...
  WESTERN ST. CHARLES PARISH IN SOUTHEAST LOUISIANA...
  THIS INCLUDES THE CITY OF HAHNVILLE...
  SOUTHERN ST. JAMES PARISH IN SOUTHEAST LOUISIANA...
  SOUTHWESTERN ST. JOHN THE BAPTIST PARISH IN SOUTHEAST LOUISIANA...

* UNTIL 715 PM CDT

* AT 646 PM CDT...NATIONAL WEATHER SERVICE METEOROLOGISTS DETECTED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO 8 MILES
  SOUTHWEST OF CONVENT...OR 6 MILES EAST OF NAPOLEONVILLE...MOVING
  EAST AT 50 MPH.

* OTHER LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO NEW
  SARPY...DESTREHAN...DES ALLEMANDS AND BOUTTE

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 AM CDT TUESDAY MORNING
FOR SOUTHEAST LOUISIANA AND SOUTHERN MISSISSIPPI.

&&

LAT...LON 2997 9036 2975 9040 2986 9104 3003 9101
TIME...MOT...LOC 2347Z 278DEG 43KT 2993 9091

$$

95/DM

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 4, 3:32 PM CDT	Gale Warning	LIX		15 hr
Apr 4, 3:32 PM CDT	Small Craft Advisory	LIX		22 hr
Apr 4, 4:31 PM CDT	Severe Thunderstorm Warning	LIX	Pointe Coupee, West Feliciana	74 min
Apr 4, 5:36 PM CDT	Severe Thunderstorm Warning	LIX	Ascension, East Baton Rouge, Iberville, Livingston, West Baton Rouge	54 min
Apr 4, 5:45 PM CDT	Severe Thunderstorm Warning	LIX	East Baton Rouge, East Feliciana, Saint Helena, West Baton Rouge	60 min
Apr 4, 6:03 PM CDT	Severe Thunderstorm Warning	LIX	East Feliciana, Saint Helena, Tangipahoa, Washington	42 min
Apr 4, 6:08 PM CDT	Severe Thunderstorm Warning	LIX	East Baton Rouge, Livingston, Saint Helena, Saint Tammany, Tangipahoa, Washington	67 min
Apr 4, 6:24 PM CDT	Tornado Warning	LIX	Livingston, Tangipahoa	36 min
Apr 4, 6:34 PM CDT	Special Marine Warning	LIX		116 min
Apr 4, 6:34 PM CDT	Severe Thunderstorm Warning	LIX	Ascension, Assumption, Livingston, Saint Charles, Saint James, Saint John the Baptist and 1 more	41 min
Apr 4, 6:51 PM CDT	Severe Thunderstorm Warning	LIX	Saint Tammany, Tangipahoa, Washington	54 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive.