Alert archive / Louisiana / Tornado Warnings in 2015

Tornado Warning 2, NWS New Orleans, LA

March 12, 2015Lafourche Parish, Terrebonne Parish, Louisiana

NWS New Orleans, LA issued this tornado warning at Mar 12, 2015, 11:19 PM CDT for Lafourche Parish, Terrebonne Parish, Louisiana. It was in force for 26 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: Mar 12, 2015, 11:19 PM CDT (04:19 UTC)
Expired: Mar 12, 2015, 11:45 PM CDT
In force: 26 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 00:00Z, 4.3 hours before the alert went out and 122 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: 108 J/kg
Mixed-layer CIN: -56 J/kg
Mixed-layer LCL: 618 m above ground
0-6 km bulk shear: 36 kt
0-1 km storm-relative helicity: 203 m²/s²
0-3 km storm-relative helicity: 236 m²/s²
Significant tornado parameter: 0.1
Supercell composite: 0.7

Open this sounding in Storm Lab

The text

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

808 
WFUS54 KLIX 130419
TORLIX
LAC057-109-130445-
/O.NEW.KLIX.TO.W.0002.150313T0419Z-150313T0445Z/

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE NEW ORLEANS LA
1119 PM CDT THU MAR 12 2015

THE NATIONAL WEATHER SERVICE IN NEW ORLEANS HAS ISSUED A

* TORNADO WARNING FOR...
  CENTRAL LAFOURCHE PARISH IN SOUTHEASTERN LOUISIANA...
  EAST CENTRAL TERREBONNE PARISH IN SOUTHEASTERN LOUISIANA...

* UNTIL 1145 PM CDT
    
* AT 1118 PM CDT...DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM
  CAPABLE OF PRODUCING A TORNADO. THIS DANGEROUS STORM WAS LOCATED 9
  MILES WEST OF LEEVILLE...OR 11 MILES SOUTH OF GALLIANO...AND MOVING
  NORTH AT 30 MPH.

* LOCATIONS IMPACTED INCLUDE...
  CUT OFF...GALLIANO...GOLDEN MEADOW AND MONTEGUT. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

TAKE COVER NOW. MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF A 
STURDY BUILDING. AVOID WINDOWS. IF YOU ARE IN A MOBILE HOME OR 
OUTDOORS...MOVE TO THE CLOSEST SUBSTANTIAL SHELTER AND PROTECT 
YOURSELF FROM FLYING DEBRIS.

IF ON THE WATER...GET OUT OF THE WATER AND MOVE TO SAFE SHELTER 
IMMEDIATELY. IF YOU CAN HEAR THUNDER...YOU ARE CLOSE ENOUGH TO BE 
STRUCK BY LIGHTNING. IN ADDITION...SEVERE THUNDERSTORMS CAN PRODUCE 
LARGE CAPSIZING WAVES...EVEN ON SMALL BODIES OF WATER. MOVE INTO 
DOCK AND SEEK SAFE SHELTER NOW. DO NOT BE CAUGHT ON THE WATER IN A 
THUNDERSTORM.

&&

LAT...LON 2926 9030 2928 9035 2930 9033 2934 9035
      2931 9035 2924 9040 2930 9040 2932 9044
      2935 9044 2934 9045 2934 9046 2933 9045
      2929 9047 2951 9056 2955 9028 2921 9027
TIME...MOT...LOC 0418Z 170DEG 24KT 2927 9037 

$$

TD

The office that day

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

Issued	Product	Office	Counties	Lasted
Mar 12, 9:44 PM CDT	Special Marine Warning	LIX		61 min
Mar 12, 10:39 PM CDT	Special Weather Statement	LIX	Jefferson, Lafourche	51 min
Mar 12, 10:48 PM CDT	Special Marine Warning	LIX		27 min
Mar 13, 1:31 AM CDT	Special Marine Warning	LIX		89 min
Mar 13, 5:15 AM CDT	Small Craft Advisory	LIX		9 hr
Mar 13, 6:29 AM CDT	Special Weather Statement	LIX	Jefferson, Saint Helena, Tangipahoa	31 min
Mar 13, 6:30 AM CDT	Special Marine Warning	LIX		60 min
Mar 13, 7:41 AM CDT	Special Weather Statement	LIX	Saint Helena, Saint Tammany, Tangipahoa, Washington	19 min
Mar 13, 7:55 AM CDT	Special Marine Warning	LIX		65 min
Mar 13, 9:18 AM CDT	Special Marine Warning	LIX		27 min
Mar 13, 12:31 PM CDT	River Flood Warning	LIX	East Baton Rouge, West Baton Rouge	26 days

Nearby

Tornado Warnings in Louisiana, 2015 Every tornado warning in 2015 Tornadoes in 2015

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.