Alert archive / Louisiana / Tornado Warnings in 2009

Tornado Warning 49, NWS New Orleans, LA

August 9, 2009Plaquemines Parish, Louisiana

NWS New Orleans, LA issued this tornado warning at Aug 9, 2009, 10:08 AM CDT for Plaquemines Parish, Louisiana. It was in force for 22 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: Aug 9, 2009, 10:08 AM CDT (15:08 UTC)
Expired: Aug 9, 2009, 10:30 AM CDT
In force: 22 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, 3.1 hours before the alert went out and 70 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: 1632 J/kg
Mixed-layer CIN: -24 J/kg
Mixed-layer LCL: 825 m above ground
0-6 km bulk shear: 7 kt
0-1 km storm-relative helicity: -36 m²/s²
0-3 km storm-relative helicity: -30 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.

000 
WFUS54 KLIX 091508
TORLIX
LAC075-091530-
/O.NEW.KLIX.TO.W.0049.090809T1508Z-090809T1530Z/

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE NEW ORLEANS LA
1008 AM CDT SUN AUG 9 2009

THE NATIONAL WEATHER SERVICE IN NEW ORLEANS HAS ISSUED A

* TORNADO WARNING FOR...
  WEST CENTRAL PLAQUEMINES PARISH IN SOUTHEAST LOUISIANA...

* UNTIL 1030 AM CDT

* AT 1007 AM CDT...THE PUBLIC REPORTED A TORNADO NEAR MYRTLE GROVE...
  OR 13 MILES NORTHWEST OF PORT SULPHUR...MOVING NORTH AT 5 MPH.

* THE TORNADO WILL OTHERWISE REMAIN OVER MAINLY MARSHY AREAS OF 
  THE INDICATED PARISH.

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 2974 8996 2969 8976 2948 8983 2958 8995
TIME...MOT...LOC 1508Z 195DEG 5KT 2959 8991

$$

1 follow-up statement

000 
WWUS54 KLIX 091532
SVSLIX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE NEW ORLEANS LA
1032 AM CDT SUN AUG 9 2009

LAC075-091542-
/O.EXP.KLIX.TO.W.0049.000000T0000Z-090809T1530Z/
PLAQUEMINES LA-
1032 AM CDT SUN AUG 9 2009

...THE TORNADO WARNING FOR WEST CENTRAL PLAQUEMINES PARISH HAS
EXPIRED...

LAT...LON 2974 8996 2969 8976 2948 8983 2958 8995
TIME...MOT...LOC 1508Z 195DEG 5KT 2959 8991

$$

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 9, 12:10 PM CDT	Areal Flood Advisory	LIX	Jefferson	47 min
Aug 9, 4:51 PM CDT	Areal Flood Advisory	LIX	Assumption, Terrebonne	114 min
Aug 9, 4:56 PM CDT	Areal Flood Advisory	LIX	Jefferson, Orleans, Plaquemines, Saint Bernard	2 hr
Aug 9, 5:40 PM CDT	Special Marine Warning	LIX		39 min

Nearby

Tornado Warnings in Louisiana, 2009 Every tornado warning in 2009 Tornadoes in 2009

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.