Alert archive / Louisiana / Tornado Warnings in 2011

Tornado Warning 60, NWS New Orleans, LA

May 13, 2011Plaquemines Parish, Louisiana

NWS New Orleans, LA issued this tornado warning at May 13, 2011, 2:17 PM CDT for Plaquemines Parish, Louisiana. It was in force for 28 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 13, 2011, 2:17 PM CDT (19:17 UTC)
Expired: May 13, 2011, 2:45 PM CDT
In force: 28 min
Issued by: NWS New Orleans, LA
Area: Storm-based polygon

County Plaquemines Parish, LA

The nearest sounding before it

Slidell Radar S, LA (KSIL), launched 12:00Z, 7.3 hours before the alert went out and 74 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: 2741 J/kg
Mixed-layer CIN: -1 J/kg
Mixed-layer LCL: 541 m above ground
0-6 km bulk shear: 42 kt
0-1 km storm-relative helicity: 96 m²/s²
0-3 km storm-relative helicity: 136 m²/s²
Significant tornado parameter: 1.2
Supercell composite: 7.3

Open this sounding in Storm Lab

The text

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

980 
WFUS54 KLIX 131917
TORLIX
LAC075-131945-
/O.NEW.KLIX.TO.W.0060.110513T1917Z-110513T1945Z/

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE NEW ORLEANS LA
217 PM CDT FRI MAY 13 2011

THE NATIONAL WEATHER SERVICE IN NEW ORLEANS HAS ISSUED A

* TORNADO WARNING FOR...
  CENTRAL PLAQUEMINES PARISH IN SOUTHEAST LOUISIANA...
  THIS INCLUDES THE CITY OF PORT SULPHUR...

* UNTIL 245 PM CDT

* AT 214 PM CDT...NATIONAL WEATHER SERVICE METEOROLOGISTS DETECTED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO 8 MILES WEST OF
  POINTE A LA HACHE...OR 13 MILES WEST OF PORT SULPHUR...MOVING EAST
  AT 25 MPH.

* THE TORNADO WILL BE NEAR PORT SULPHUR AROUND 240 PM. 

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.

&&

LAT...LON 2949 8997 2965 8994 2967 8961 2965 8961
      2965 8963 2964 8964 2963 8962 2961 8962
      2962 8968 2960 8971 2954 8967 2950 8962
      2945 8962
TIME...MOT...LOC 1916Z 272DEG 24KT 2955 8991

$$

The office that day

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

Issued	Product	Office	Counties	Lasted
May 13, 12:12 PM CDT	Special Marine Warning	LIX		63 min
May 13, 12:29 PM CDT	Special Marine Warning	LIX		61 min
May 13, 1:04 PM CDT	Special Marine Warning	LIX		26 min
May 13, 1:13 PM CDT	Special Marine Warning	LIX		32 min
May 13, 1:28 PM CDT	Tornado Warning	LIX	Jefferson, Lafourche, Plaquemines	32 min
May 13, 1:32 PM CDT	Special Marine Warning	LIX		28 min
May 13, 1:50 PM CDT	Tornado Warning	LIX	Jefferson, Plaquemines	25 min
May 13, 2:07 PM CDT	Severe Thunderstorm Warning	LIX	Saint Tammany, Washington	53 min
May 13, 2:33 PM CDT	Tornado Warning	LIX	Plaquemines	27 min
May 13, 2:38 PM CDT	Special Marine Warning	LIX		82 min
May 13, 3:36 PM CDT	Special Marine Warning	LIX		54 min
May 13, 3:43 PM CDT	Special Marine Warning	LIX		92 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.