Alert archive / Louisiana / Tornado Warnings in 2012

Tornado Warning 40, NWS New Orleans, LA

May 31, 2012Livingston Parish, Saint Helena Parish, Tangipahoa Parish, Louisiana

NWS New Orleans, LA issued this tornado warning at May 31, 2012, 2:55 PM CDT for Livingston Parish, Saint Helena Parish, Tangipahoa Parish, Louisiana. It was in force for 35 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: May 31, 2012, 2:55 PM CDT (19:55 UTC)
Expired: May 31, 2012, 3:30 PM CDT
In force: 35 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
May 31, 10:41 AM CDT	Severe Thunderstorm Watch	SPC	6 hr
May 31, 2:53 PM CDT	Severe Thunderstorm Watch	SPC	5 hr

The nearest sounding before it

Slidell Radar S, LA (KSIL), launched 12:00Z, 7.9 hours before the alert went out and 92 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: 1878 J/kg
Mixed-layer CIN: -13 J/kg
Mixed-layer LCL: 652 m above ground
0-6 km bulk shear: 13 kt
0-1 km storm-relative helicity: -18 m²/s²
0-3 km storm-relative helicity: -31 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.

324 
WFUS54 KLIX 311955
TORLIX
LAC063-091-105-312030-
/O.NEW.KLIX.TO.W.0040.120531T1955Z-120531T2030Z/

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE NEW ORLEANS LA
255 PM CDT THU MAY 31 2012

THE NATIONAL WEATHER SERVICE IN NEW ORLEANS HAS ISSUED A

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

* UNTIL 330 PM CDT

* AT 252 PM CDT...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
  15 MPH.

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

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 SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 900 PM CDT
THURSDAY EVENING FOR SOUTHEAST LOUISIANA AND SOUTHERN MISSISSIPPI. A
SEVERE THUNDERSTORM WATCH ALSO REMAINS IN EFFECT UNTIL 600 PM CDT
THURSDAY EVENING FOR SOUTHEAST LOUISIANA AND SOUTHERN MISSISSIPPI.

&&

LAT...LON 3083 9043 3054 9038 3048 9067 3063 9078
TIME...MOT...LOC 1955Z 238DEG 15KT 3060 9063

$$

1 follow-up statement

537 
WWUS54 KLIX 312023
SVSLIX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE NEW ORLEANS LA
323 PM CDT THU MAY 31 2012

LAC063-091-105-312032-
/O.EXP.KLIX.TO.W.0040.000000T0000Z-120531T2030Z/
ST. HELENA LA-LIVINGSTON LA-TANGIPAHOA LA-
323 PM CDT THU MAY 31 2012

...THE TORNADO WARNING FOR WEST CENTRAL TANGIPAHOA...NORTH CENTRAL
LIVINGSTON AND SOUTHEASTERN ST. HELENA PARISHES WILL EXPIRE AT 330 PM
CDT...

THE STORM THAT PROMPTED THE WARNING HAS MOVED OUT OF THE WARNED 
AREA. 

SEVERE THUNDERSTORM WATCHES ARE IN EFFECT UNTIL 600 PM CDT WEST OF 
INTERSTATE 55...AND UNTIL 900 PM CDT EAST OF INTERSTATE 55. 

LAT...LON 3083 9043 3054 9038 3048 9067 3063 9078
TIME...MOT...LOC 2022Z 238DEG 15KT 3066 9052

$$

The office that day

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

Issued	Product	Office	Counties	Lasted
May 31, 2:00 PM CDT	Severe Thunderstorm Warning	LIX	Saint James, Saint John the Baptist	60 min
May 31, 2:11 PM CDT	Severe Thunderstorm Warning	LIX	East Feliciana, Saint Helena	34 min
May 31, 2:39 PM CDT	Special Marine Warning	LIX		96 min
May 31, 2:50 PM CDT	Severe Thunderstorm Warning	LIX	Livingston, Tangipahoa	25 min
May 31, 3:25 PM CDT	Special Marine Warning	LIX		65 min
May 31, 3:31 PM CDT	Severe Thunderstorm Warning	LIX	Washington	29 min
May 31, 3:49 PM CDT	Severe Thunderstorm Warning	LIX	Washington	26 min
May 31, 4:00 PM CDT	Special Marine Warning	LIX		30 min
May 31, 5:17 PM CDT	Special Marine Warning	LIX		88 min
May 31, 5:33 PM CDT	Special Marine Warning	LIX		87 min
May 31, 6:12 PM CDT	Special Marine Warning	LIX		63 min
May 31, 6:45 PM CDT	Special Marine Warning	LIX		60 min

Nearby

Tornado Warnings in Louisiana, 2012 Every tornado warning in 2012 Tornadoes in 2012

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.