Alert archive / Louisiana / Tornado Warnings in 2011

Tornado Warning 45, NWS New Orleans, LA

April 4, 2011Plaquemines Parish, Saint Bernard Parish, Louisiana

NWS New Orleans, LA issued this tornado warning at Apr 4, 2011, 7:55 PM CDT for Plaquemines Parish, Saint Bernard 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: Apr 4, 2011, 7:55 PM CDT (00:55 UTC)
Expired: Apr 4, 2011, 8:30 PM CDT
In force: 35 min
Issued by: NWS New Orleans, LA
Area: Storm-based polygon

Counties Plaquemines Parish, LA, Saint Bernard 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
Apr 4, 5:28 PM CDT	Tornado Watch	SPC	7 hr

The nearest sounding before it

Slidell Radar S, LA (KSIL), launched 00:00Z, 0.9 hours before the alert went out and 67 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: 3275 J/kg
Mixed-layer CIN: 0 J/kg
Mixed-layer LCL: 562 m above ground
0-6 km bulk shear: 44 kt
0-1 km storm-relative helicity: 245 m²/s²
0-3 km storm-relative helicity: 249 m²/s²
Significant tornado parameter: 4.7
Supercell composite: 20.4

Open this sounding in Storm Lab

The text

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

672 
WFUS54 KLIX 050055
TORLIX
LAC075-087-050130-
/O.NEW.KLIX.TO.W.0045.110405T0055Z-110405T0130Z/

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

THE NATIONAL WEATHER SERVICE IN NEW ORLEANS HAS ISSUED A

* TORNADO WARNING FOR...
  NORTHWESTERN PLAQUEMINES PARISH IN SOUTHEAST LOUISIANA...
  SOUTHWESTERN ST. BERNARD PARISH IN SOUTHEAST LOUISIANA...

* UNTIL 830 PM CDT

* AT 754 PM CDT...NATIONAL WEATHER SERVICE METEOROLOGISTS DETECTED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO NEAR VIOLET...OR
  6 MILES EAST OF BELLE CHASSE...MOVING EAST AT 45 MPH.

* OTHER LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO
  YSCLOSKEY

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 2958 8965 2958 8970 2959 8975 2971 9004
      2992 8989 2984 8936 2972 8950 2967 8951
      2965 8958 2963 8957 2961 8959 2958 8956
      2958 8959 2956 8962 2956 8966
TIME...MOT...LOC 0056Z 283DEG 41KT 2982 8988

$$

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, 7:00 PM CDT	Tornado Warning	LIX	Saint Tammany	45 min
Apr 4, 7:17 PM CDT	Severe Thunderstorm Warning	LIX	Jefferson, Lafourche, Saint Charles, Saint James, Saint John the Baptist	43 min
Apr 4, 7:32 PM CDT	Severe Thunderstorm Warning	LIX	Jefferson, Orleans, Plaquemines, Saint Bernard	43 min
Apr 4, 7:37 PM CDT	Tornado Warning	LIX	Jefferson, Orleans, Plaquemines, Saint Bernard, Saint Charles	23 min
Apr 4, 7:39 PM CDT	Special Marine Warning	LIX		2 hr
Apr 4, 7:42 PM CDT	Tornado Warning	LIX	Saint Tammany	48 min
Apr 4, 7:45 PM CDT	Special Marine Warning	LIX		30 min
Apr 4, 7:47 PM CDT	Severe Thunderstorm Warning	LIX	Saint Tammany	73 min
Apr 4, 7:48 PM CDT	Wind Advisory	LIX		11 hr
Apr 4, 8:08 PM CDT	Special Marine Warning	LIX		97 min
Apr 4, 8:16 PM CDT	Severe Thunderstorm Warning	LIX	Jefferson, Plaquemines, Saint Bernard	44 min
Apr 4, 8:49 PM CDT	Severe Thunderstorm Warning	LIX	Plaquemines	71 min
Apr 4, 9:52 PM CDT	Special Marine Warning	LIX		83 min
Apr 4, 10:58 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.