Alert archive / Louisiana / Tornado Warnings in 2011

Tornado Warning 33, NWS New Orleans, LA

March 29, 2011Saint Charles Parish, Saint John the Baptist Parish, Louisiana

NWS New Orleans, LA issued this tornado warning at Mar 29, 2011, 5:26 PM CDT for Saint Charles Parish, Saint John the Baptist Parish, Louisiana. It was in force for 34 min. 1 report came from inside the area while it was in force.

The area

The outline as issued, with what was reported inside it.

The facts

Issued: Mar 29, 2011, 5:26 PM CDT (22:26 UTC)
Expired: Mar 29, 2011, 6:00 PM CDT
In force: 34 min
Issued by: NWS New Orleans, LA
Area: Storm-based polygon

Counties Saint Charles Parish, LA, Saint John the Baptist Parish, LA

What was reported inside it

Time	Report	Where	Remark
Mar 29, 5:50 PM CDT	HAIL 0.88	Laplace, LA

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

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 29, 3:17 PM CDT	Tornado Watch	SPC	7 hr

The nearest sounding before it

Slidell Radar S, LA (KSIL), launched 12:00Z, 10.4 hours before the alert went out and 72 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: 7 J/kg
Mixed-layer CIN: -508 J/kg
Mixed-layer LCL: 621 m above ground
0-6 km bulk shear: 33 kt
0-1 km storm-relative helicity: 267 m²/s²
0-3 km storm-relative helicity: 248 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 4.4

Open this sounding in Storm Lab

The text

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

139 
WFUS54 KLIX 292226
TORLIX
LAC089-095-292300-
/O.NEW.KLIX.TO.W.0033.110329T2226Z-110329T2300Z/

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE NEW ORLEANS LA
526 PM CDT TUE MAR 29 2011

THE NATIONAL WEATHER SERVICE IN NEW ORLEANS HAS ISSUED A

* TORNADO WARNING FOR...
  NORTHWESTERN ST. CHARLES PARISH IN SOUTHEAST LOUISIANA...
  THIS INCLUDES THE CITY OF HAHNVILLE...
  CENTRAL ST. JOHN THE BAPTIST PARISH IN SOUTHEAST LOUISIANA...
  THIS INCLUDES THE CITY OF LAPLACE...

* UNTIL 600 PM CDT

* AT 521 PM CDT...NATIONAL WEATHER SERVICE METEOROLOGISTS DETECTED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO NEAR LAPLACE...
  MOVING EAST AT 20 MPH.

* THE TORNADO WILL BE NEAR...
  NORCO AND HAHNVILLE BY 535 PM CDT...
  NEW SARPY BY 540 PM CDT...
  DESTREHAN BY 545 PM CDT...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

A TORNADO WATCH REMAINS IN EFFECT UNTIL 1000 PM CDT TUESDAY EVENING
FOR SOUTHEAST LOUISIANA AND SOUTHERN MISSISSIPPI.

&&

LAT...LON 2997 9053 3008 9053 3006 9037 3007 9035
      3006 9035 3006 9027 2987 9027
TIME...MOT...LOC 2226Z 283DEG 18KT 3002 9047

$$


24/RR

1 follow-up statement

476 
WWUS54 KLIX 292252
SVSLIX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE NEW ORLEANS LA
552 PM CDT TUE MAR 29 2011

LAC089-095-292302-
/O.EXP.KLIX.TO.W.0033.000000T0000Z-110329T2300Z/
ST. JOHN THE BAPTIST LA-ST. CHARLES LA-
552 PM CDT TUE MAR 29 2011

...THE TORNADO WARNING FOR NORTHWESTERN ST. CHARLES AND CENTRAL ST.
JOHN THE BAPTIST PARISHES WILL EXPIRE AT 600 PM CDT...

A TORNADO WATCH REMAINS IN EFFECT UNTIL 1000 PM CDT TUESDAY EVENING
FOR SOUTHEAST LOUISIANA AND SOUTHERN MISSISSIPPI.

LAT...LON 2997 9053 3008 9053 3006 9037 3007 9035
      3006 9035 3006 9027 2987 9027
TIME...MOT...LOC 2252Z 283DEG 18KT 2999 9032

$$


24/RR

The office that day

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

Issued	Product	Office	Counties	Lasted
Mar 29, 3:52 PM CDT	Severe Thunderstorm Warning	LIX	Ascension, Livingston	40 min
Mar 29, 3:57 PM CDT	Severe Thunderstorm Warning	LIX	Ascension, East Baton Rouge, Iberville	43 min
Mar 29, 4:03 PM CDT	Tornado Warning	LIX	Ascension, Saint James, Saint John the Baptist	27 min
Mar 29, 4:25 PM CDT	Special Marine Warning	LIX		35 min
Mar 29, 4:28 PM CDT	Tornado Warning	LIX	Saint James, Saint John the Baptist	32 min
Mar 29, 4:51 PM CDT	Areal Flood Advisory	LIX	Ascension, Saint James, Saint John the Baptist	54 min
Mar 29, 4:56 PM CDT	Severe Thunderstorm Warning	LIX	Ascension, Iberville	64 min
Mar 29, 4:56 PM CDT	Tornado Warning	LIX	Saint Charles, Saint John the Baptist	34 min
Mar 29, 5:05 PM CDT	Severe Thunderstorm Warning	LIX	Saint James, Saint John the Baptist	55 min
Mar 29, 5:14 PM CDT	Severe Thunderstorm Warning	LIX	East Baton Rouge, East Feliciana, Livingston, Saint Helena	61 min
Mar 29, 5:16 PM CDT	Severe Thunderstorm Warning	LIX	Livingston, Saint Helena, Tangipahoa, Washington	59 min
Mar 29, 5:25 PM CDT	Special Marine Warning	LIX		65 min
Mar 29, 6:06 PM CDT	Severe Thunderstorm Warning	LIX	Jefferson, Saint Charles	24 min
Mar 29, 6:33 PM CDT	Severe Thunderstorm Warning	LIX	Jefferson, Orleans	27 min
Mar 29, 6:43 PM CDT	Areal Flood Advisory	LIX	Jefferson, Orleans, Plaquemines, Saint Bernard, Saint Charles	2 hr
Mar 29, 6:52 PM CDT	Severe Thunderstorm Warning	LIX	Jefferson, Orleans, Plaquemines, Saint Bernard	23 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive.