Alert archive / Louisiana / Tornado Warnings in 2012

Tornado Warning 23, NWS New Orleans, LA

March 21, 2012Jefferson Parish, Orleans Parish, Saint Bernard Parish, Louisiana

NWS New Orleans, LA issued this tornado warning at Mar 21, 2012, 12:38 PM CDT for Jefferson Parish, Orleans Parish, Saint Bernard Parish, Louisiana. It was in force for 25 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 21, 2012, 12:38 PM CDT (17:38 UTC)
Expired: Mar 21, 2012, 1:03 PM CDT
In force: 25 min
Issued by: NWS New Orleans, LA
Area: Storm-based polygon

Counties Jefferson Parish, LA, Orleans 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
Mar 21, 10:07 AM CDT	Tornado Watch	SPC	8 hr

The nearest sounding before it

Slidell Radar S, LA (KSIL), launched 12:00Z, 5.6 hours before the alert went out and 54 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: 983 J/kg
Mixed-layer CIN: 0 J/kg
Mixed-layer LCL: 519 m above ground
0-6 km bulk shear: 46 kt
0-1 km storm-relative helicity: 363 m²/s²
0-3 km storm-relative helicity: 421 m²/s²
Significant tornado parameter: 1.7
Supercell composite: 10.7

Open this sounding in Storm Lab

The text

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

380 
WFUS54 KLIX 211738
TORLIX
LAC051-071-087-211815-
/O.NEW.KLIX.TO.W.0023.120321T1738Z-120321T1815Z/

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE NEW ORLEANS LA
1238 PM CDT WED MAR 21 2012

THE NATIONAL WEATHER SERVICE IN NEW ORLEANS HAS ISSUED A

* TORNADO WARNING FOR...
  NORTHERN JEFFERSON PARISH IN SOUTHEAST LOUISIANA...
  THIS INCLUDES THE CITIES OF...MARRERO...HARVEY...AVONDALE...
  WESTERN ORLEANS PARISH IN SOUTHEAST LOUISIANA...
  THIS INCLUDES THE CITIES OF...NEW ORLEANS...EAST NEW ORLEANS...
  EXTREME NORTHWESTERN ST. BERNARD PARISH IN SOUTHEAST LOUISIANA...
  THIS INCLUDES THE CITY OF CHALMETTE...

* UNTIL 115 PM CDT

* AT 1233 PM CDT...NATIONAL WEATHER SERVICE METEOROLOGISTS DETECTED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO NEAR JEAN
  LAFITTE...OR NEAR MARRERO...MOVING NORTH AT 40 MPH.



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 600 PM CDT WEDNESDAY EVENING
FOR SOUTHEAST LOUISIANA AND SOUTHERN MISSISSIPPI.

&&

LAT...LON 2976 9019 2982 9017 2985 9021 3003 9015
      3004 9005 3006 9003 3005 8999 3015 8988
      2992 8996 2983 9007 2978 9006 2977 9007
      2973 9006
TIME...MOT...LOC 1738Z 195DEG 35KT 2986 9011

$$

1 follow-up statement

443 
WWUS54 KLIX 211803
SVSLIX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE NEW ORLEANS LA
103 PM CDT WED MAR 21 2012

LAC051-071-087-211813-
/O.CAN.KLIX.TO.W.0023.000000T0000Z-120321T1815Z/
ORLEANS LA-JEFFERSON LA-ST. BERNARD LA-
103 PM CDT WED MAR 21 2012

...THE TORNADO WARNING FOR EXTREME NORTHWESTERN ST. BERNARD...
NORTHERN JEFFERSON AND WESTERN ORLEANS PARISHES IS CANCELLED...

THE STORM CAPABLE OF PRODUCING A TORNADO HAS MOVED OVER LAKE 
PONTCHARTRAIN.

A TORNADO WATCH REMAINS IN EFFECT UNTIL 600 PM CDT WEDNESDAY EVENING
FOR SOUTHEAST LOUISIANA AND SOUTHERN MISSISSIPPI.

LAT...LON 2976 9019 2982 9017 2985 9021 3003 9015
      3004 9005 3006 9003 3005 8999 3015 8988
      2992 8996 2983 9007 2978 9006 2977 9007
      2973 9006
TIME...MOT...LOC 1803Z 195DEG 35KT 3009 9004

$$

The office that day

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

Issued	Product	Office	Counties	Lasted
Mar 21, 7:34 AM CDT	Severe Thunderstorm Warning	LIX	East Baton Rouge, Iberville, Livingston, Pointe Coupee, West Baton Rouge, West Feliciana	56 min
Mar 21, 8:30 AM CDT	Severe Thunderstorm Warning	LIX	Ascension, Assumption, East Baton Rouge, Iberville	60 min
Mar 21, 8:32 AM CDT	Severe Thunderstorm Warning	LIX	East Baton Rouge, East Feliciana, Iberville, Pointe Coupee, West Baton Rouge, West Feliciana	58 min
Mar 21, 8:45 AM CDT	Areal Flood Advisory	LIX	Ascension, Assumption, East Baton Rouge, East Feliciana, Iberville, Lafourche and 7 more	2 hr
Mar 21, 8:49 AM CDT	Tornado Warning	LIX	Ascension, Assumption, Iberville, Saint James	38 min
Mar 21, 9:10 AM CDT	Severe Thunderstorm Warning	LIX	East Baton Rouge, East Feliciana, Saint Helena, West Feliciana	65 min
Mar 21, 9:18 AM CDT	Severe Thunderstorm Warning	LIX	Ascension, Assumption, Lafourche, Saint James, Terrebonne	57 min
Mar 21, 9:19 AM CDT	Tornado Warning	LIX	Ascension, East Baton Rouge, Iberville, Livingston	26 min
Mar 21, 9:29 AM CDT	River Flood Warning	LIX	Saint Tammany, Washington	19 days
Mar 21, 9:36 AM CDT	Severe Thunderstorm Warning	LIX	Ascension, Livingston, Saint Helena, Tangipahoa	54 min
Mar 21, 9:49 AM CDT	Tornado Warning	LIX	East Baton Rouge, East Feliciana, Livingston, Saint Helena	56 min
Mar 21, 10:05 AM CDT	River Flood Warning	LIX	Tangipahoa	4 days
Mar 21, 10:07 AM CDT	Severe Thunderstorm Warning	LIX	Jefferson, Lafourche, Saint Charles, Saint John the Baptist, Saint Tammany, Tangipahoa and 1 more	53 min
Mar 21, 10:11 AM CDT	Special Marine Warning	LIX		2 hr
Mar 21, 10:16 AM CDT	Tornado Warning	LIX	Livingston, Saint John the Baptist, Tangipahoa	44 min
Mar 21, 10:24 AM CDT	River Flood Warning	LIX	Saint Tammany	49 hr
Mar 21, 10:24 AM CDT	Severe Thunderstorm Warning	LIX	Livingston, Saint Helena, Tangipahoa, Washington	51 min
Mar 21, 10:33 AM CDT	Special Marine Warning	LIX		117 min
Mar 21, 11:01 AM CDT	Severe Thunderstorm Warning	LIX	Saint Tammany, Tangipahoa, Washington	59 min
Mar 21, 11:05 AM CDT	Severe Thunderstorm Warning	LIX	Jefferson, Lafourche, Saint Charles, Saint John the Baptist, Tangipahoa, Terrebonne	55 min
Mar 21, 11:11 AM CDT	Small Craft Advisory	LIX		5 hr
Mar 21, 11:12 AM CDT	Areal Flood Advisory	LIX	Jefferson, Lafourche, Saint Charles, Saint John the Baptist, Saint Tammany, Tangipahoa and 2 more	2 hr
Mar 21, 11:18 AM CDT	Severe Thunderstorm Warning	LIX	Tangipahoa, Washington	57 min
Mar 21, 11:52 AM CDT	Severe Thunderstorm Warning	LIX	Jefferson, Lafourche, Orleans, Plaquemines, Saint Bernard, Saint Charles	53 min
Mar 21, 12:03 PM CDT	Severe Thunderstorm Warning	LIX	Saint Tammany, Washington	57 min
Mar 21, 12:04 PM CDT	Special Marine Warning	LIX		116 min
Mar 21, 12:12 PM CDT	Tornado Warning	LIX	Saint Tammany	36 min
Mar 21, 12:55 PM CDT	Severe Thunderstorm Warning	LIX	Saint Tammany, Washington	65 min
Mar 21, 1:16 PM CDT	Special Marine Warning	LIX		119 min
Mar 21, 1:46 PM CDT	Tornado Warning	LIX	Saint Tammany	29 min
Mar 21, 1:57 PM CDT	Special Marine Warning	LIX		33 min
Mar 21, 2:05 PM CDT	Severe Thunderstorm Warning	LIX	Washington	55 min
Mar 21, 3:13 PM CDT	Special Marine Warning	LIX		2 hr
Mar 21, 4:57 PM CDT	Areal Flood Advisory	LIX	Orleans, Plaquemines, Saint Bernard, Saint Tammany	2 hr
Mar 21, 5:25 PM CDT	Flash Flood Warning	LIX	Orleans, Saint Bernard, Saint Tammany	2 hr
Mar 21, 5:44 PM CDT	Special Marine Warning	LIX		2 hr

Nearby

Tornado Warnings in Louisiana, 2012 Every tornado warning in 2012 Tornadoes in 2012

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.