Alert archive / Louisiana / Tornado Warnings in 2009

Tornado Warning 39, NWS New Orleans, LA

May 4, 2009Livingston Parish, Tangipahoa Parish, Louisiana

NWS New Orleans, LA issued this tornado warning at May 4, 2009, 7:44 AM CDT for Livingston Parish, Tangipahoa Parish, Louisiana. It was in force for 31 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 4, 2009, 7:44 AM CDT (12:44 UTC)
Expired: May 4, 2009, 8:15 AM CDT
In force: 31 min
Issued by: NWS New Orleans, LA
Area: Storm-based polygon

Counties Livingston 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 4, 7:33 AM CDT	Tornado Watch	SPC	6 hr

The nearest sounding before it

Slidell Radar S, LA (KSIL), launched 12:00Z, 0.7 hours before the alert went out and 79 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: 2102 J/kg
Mixed-layer CIN: -2 J/kg
Mixed-layer LCL: 577 m above ground
0-6 km bulk shear: 36 kt
0-1 km storm-relative helicity: 170 m²/s²
0-3 km storm-relative helicity: 242 m²/s²
Significant tornado parameter: 1.6
Supercell composite: 9.9

Open this sounding in Storm Lab

The text

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

000 
WFUS54 KLIX 041244
TORLIX
LAC063-105-041315-
/O.NEW.KLIX.TO.W.0039.090504T1244Z-090504T1315Z/

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE NEW ORLEANS LA
744 AM CDT MON MAY 4 2009

THE NATIONAL WEATHER SERVICE IN NEW ORLEANS HAS ISSUED A

* TORNADO WARNING FOR...
  EAST CENTRAL LIVINGSTON PARISH IN SOUTHEAST LOUISIANA...
  SOUTHWESTERN TANGIPAHOA PARISH IN SOUTHEAST LOUISIANA...

* UNTIL 815 AM CDT

* AT 742 AM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO 10 MILES
  SOUTHWEST OF SPRINGFIELD...OR 17 MILES NORTHEAST OF GONZALES...
  MOVING EAST AT 20 MPH.

* THE TORNADO WILL BE NEAR...
  SPRINGFIELD BY 810 AM CDT...
  6 MILES SOUTHWEST OF PONCHATOULA BY 815 AM CDT...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

IN ADDITION TO THE TORNADO...THIS STORM IS CAPABLE OF PRODUCING 
PENNY SIZE HAIL AND DESTRUCTIVE STRAIGHT LINE WINDS.

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 200 PM CDT MONDAY AFTERNOON
FOR SOUTHEAST LOUISIANA AND SOUTHERN MISSISSIPPI.

&&

LAT...LON 3049 9040 3032 9043 3032 9045 3034 9049
      3026 9057 3034 9073 3046 9064
TIME...MOT...LOC 1244Z 265DEG 17KT 3035 9068

$$


24/RR

1 follow-up statement

000 
WWUS54 KLIX 041309
SVSLIX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE NEW ORLEANS LA
809 AM CDT MON MAY 4 2009

LAC063-105-041315-
/O.CON.KLIX.TO.W.0039.000000T0000Z-090504T1315Z/
LIVINGSTON LA-TANGIPAHOA LA-
809 AM CDT MON MAY 4 2009

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 815 AM CDT FOR
SOUTHWESTERN TANGIPAHOA AND EAST CENTRAL LIVINGSTON PARISHES...

AT 808 AM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
INDICATE A TORNADO.  THIS TORNADO WAS LOCATED NEAR KILLIAN...OR 12
MILES SOUTHWEST OF HAMMOND...MOVING EAST AT 20 MPH.

THE TORNADO WILL BE NEAR...
  SPRINGFIELD AND 7 MILES SOUTHWEST OF PONCHATOULA BY 815 AM CDT...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A TORNADO WATCH REMAINS IN EFFECT UNTIL 200 PM CDT MONDAY AFTERNOON
FOR SOUTHEAST LOUISIANA AND SOUTHERN MISSISSIPPI.

&&

LAT...LON 3033 9043 3034 9049 3028 9055 3028 9061
      3046 9061 3047 9055 3049 9041
TIME...MOT...LOC 1309Z 265DEG 17KT 3037 9057

$$


24/RR

The office that day

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

Issued	Product	Office	Counties	Lasted
May 3, 11:14 PM CDT	Small Craft Advisory	LIX		11 hr
May 4, 5:43 AM CDT	Severe Thunderstorm Warning	LIX	Washington	32 min
May 4, 5:46 AM CDT	Areal Flood Advisory	LIX	Jefferson, Orleans, Saint Charles, Saint Helena, Saint John the Baptist, Tangipahoa and 1 more	73 days
May 4, 6:08 AM CDT	Tornado Warning	LIX	Tangipahoa, Washington	37 min
May 4, 6:14 AM CDT	Areal Flood Advisory	LIX	Ascension, East Baton Rouge, Iberville, Livingston, Saint Tammany, West Baton Rouge	76 days
May 4, 6:37 AM CDT	Severe Thunderstorm Warning	LIX	Ascension, Assumption, East Baton Rouge, Iberville, Livingston, Saint James and 1 more	53 min
May 4, 6:43 AM CDT	Tornado Warning	LIX	Washington	32 min
May 4, 7:14 AM CDT	Tornado Warning	LIX	Ascension, Assumption, Iberville, Saint James	46 min
May 4, 7:50 AM CDT	Severe Thunderstorm Warning	LIX	Washington	55 min
May 4, 7:55 AM CDT	Tornado Warning	LIX	Ascension, Assumption, Saint James, Saint John the Baptist	35 min
May 4, 8:27 AM CDT	Tornado Warning	LIX	Lafourche, Saint James, Saint John the Baptist	33 min
May 4, 8:45 AM CDT	Areal Flood Advisory	LIX	East Baton Rouge, Livingston, Washington, West Baton Rouge	83 days
May 4, 8:52 AM CDT	Tornado Warning	LIX	Lafourche, Saint Charles, Saint James, Saint John the Baptist	38 min
May 4, 9:00 AM CDT	Areal Flood Advisory	LIX	Assumption, Saint Charles, Saint James, Saint John the Baptist	83 days
May 4, 10:10 AM CDT	Severe Thunderstorm Warning	LIX	Assumption	22 min
May 4, 10:17 AM CDT	Flash Flood Watch	LIX	Assumption, Saint Bernard, Saint James, Saint John the Baptist	4 hr
May 4, 10:43 AM CDT	Severe Thunderstorm Warning	LIX	Jefferson, Lafourche, Plaquemines	47 min
May 4, 11:03 AM CDT	Areal Flood Advisory	LIX	Assumption, Lafourche, Saint Tammany, Terrebonne	84 days
May 4, 11:17 AM CDT	Special Marine Warning	LIX		88 min
May 4, 12:44 PM CDT	Special Marine Warning	LIX		91 min
May 4, 3:17 PM CDT	River Flood Warning	LIX	East Baton Rouge, Pointe Coupee, West Feliciana	44 days

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.