Alert archive / Louisiana / Tornado Warnings in 2012

Tornado Warning 85, NWS New Orleans, LA

December 10, 2012Ascension Parish, Livingston Parish, Louisiana

NWS New Orleans, LA issued this tornado warning at Dec 10, 2012, 8:54 AM CST for Ascension Parish, Livingston Parish, Louisiana. It was in force for 36 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
Dec 10, 2012, 8:54 AM CST (14:54 UTC)
Expired
Dec 10, 2012, 9:30 AM CST
In force
36 min
Issued by
NWS New Orleans, LA
Area
Storm-based polygon

Counties Ascension Parish, LA, Livingston Parish, LA

What was reported inside it

TimeReportWhereRemark
Dec 10, 8:55 AM CSTTORNADO1 N Gonzales, LAASCENSION PARISH EMERGENCY MANAGEMENT REPORTED A POSSIBLE TORNADO WITH DAMAGE IN TWO AREAS. THE FIRST AREA WAS ALONG BLACK BAYOU ROAD NEAR US HIGHWAY 61 AND THE SECOND WAS AT THE 7TH DISTRICT FIRE STATION ON HWY 44. FRONT WALL DAMAGE REPORTED TO THE FIRE STATI

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.

IssuedProductOfficeLasted
Dec 10, 5:44 AM CSTTornado WatchSPC5 hr

The nearest sounding before it

Slidell Radar S, LA (KSIL), launched 12:00Z, 2.9 hours before the alert went out and 103 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-pSkew-T log-p diagram, Slidell Radar S, LA at 12:00Z on 2012-12-10Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 767 joules per kilogram.LCLEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Slidell Radar S, LA at 12:00Z on 2012-12-10The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 237 square meters per square second.1939587897Sfc1 km3 km6 km9 kmRMLM
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
767 J/kg
Mixed-layer CIN
0 J/kg
Mixed-layer LCL
488 m above ground
0-6 km bulk shear
61 kt
0-1 km storm-relative helicity
237 m²/s²
0-3 km storm-relative helicity
263 m²/s²
Significant tornado parameter
1.3
Supercell composite
7.9

Open this sounding in Storm Lab

The text

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

231 
WFUS54 KLIX 101454
TORLIX
LAC005-063-101530-
/O.NEW.KLIX.TO.W.0085.121210T1454Z-121210T1530Z/

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE NEW ORLEANS LA
854 AM CST MON DEC 10 2012

THE NATIONAL WEATHER SERVICE IN NEW ORLEANS HAS ISSUED A

* TORNADO WARNING FOR...
  NORTHERN ASCENSION PARISH IN SOUTHEAST LOUISIANA...
  THIS INCLUDES THE CITY OF GONZALES...
  SOUTHERN LIVINGSTON PARISH IN SOUTHEAST LOUISIANA...

* UNTIL 930 AM CST

* AT 853 AM CST...NATIONAL WEATHER SERVICE METEOROLOGISTS DETECTED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO NEAR GONZALES...
  MOVING EAST AT 30 MPH.

* OTHER LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO
  SORRENTO AND WHITEHALL

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.

PLEASE FOLLOW OUR OFFICE ON BOTH FACEBOOK AND TWITTER FOR MORE
INFORMATION ON SEVERE WEATHER AND TO RELAY WEATHER REPORTS AND
PHOTOS.

A TORNADO WATCH REMAINS IN EFFECT UNTIL 300 PM CST MONDAY AFTERNOON
FOR SOUTHEAST LOUISIANA AND SOUTHERN MISSISSIPPI. A TORNADO WATCH
ALSO REMAINS IN EFFECT UNTIL 1100 AM CST MONDAY MORNING FOR SOUTHEAST
LOUISIANA AND SOUTHERN MISSISSIPPI.

&&

LAT...LON 3035 9099 3034 9091 3035 9090 3036 9091
      3044 9055 3031 9051 3027 9057 3024 9058
      3021 9060 3022 9063 3021 9063 3016 9099
      3031 9103
TIME...MOT...LOC 1455Z 258DEG 28KT 3027 9090

$$

95/DM
1 follow-up statement
628 
WWUS54 KLIX 101528
SVSLIX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE NEW ORLEANS LA
928 AM CST MON DEC 10 2012

LAC005-063-101538-
/O.EXP.KLIX.TO.W.0085.000000T0000Z-121210T1530Z/
ASCENSION LA-LIVINGSTON LA-
928 AM CST MON DEC 10 2012

...THE TORNADO WARNING FOR SOUTHERN LIVINGSTON AND NORTHERN ASCENSION
PARISHES WILL EXPIRE AT 930 AM CST...

THE STORM THAT PROMPTED THE WARNING HAS MOVED OUT OF THE AREA.

A TORNADO WATCH REMAINS IN EFFECT UNTIL 300 PM CST MONDAY AFTERNOON
FOR SOUTHEAST LOUISIANA AND SOUTHERN MISSISSIPPI. A TORNADO WATCH
ALSO REMAINS IN EFFECT UNTIL 1100 AM CST MONDAY MORNING FOR SOUTHEAST
LOUISIANA.

LAT...LON 3035 9099 3034 9091 3035 9090 3036 9091
      3044 9055 3031 9051 3027 9057 3024 9058
      3021 9060 3022 9063 3021 9063 3016 9099
      3031 9103
TIME...MOT...LOC 1528Z 258DEG 28KT 3032 9061

$$

95/DM

The office that day

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

IssuedProductOfficeCountiesLasted
Dec 10, 3:13 AM CSTSmall Craft AdvisoryLIX24 hr
Dec 10, 6:31 AM CSTTornado WarningLIXEast Feliciana, Saint Helena29 min
Dec 10, 6:55 AM CSTSevere Thunderstorm WarningLIXEast Baton Rouge, East Feliciana, Livingston, Saint Helena, West Baton Rouge35 min
Dec 10, 7:23 AM CSTSevere Thunderstorm WarningLIXEast Baton Rouge, Livingston, Saint Helena, West Baton Rouge37 min
Dec 10, 7:24 AM CSTSevere Thunderstorm WarningLIXTangipahoa, Washington36 min
Dec 10, 7:33 AM CSTTornado WarningLIXWashington27 min
Dec 10, 7:45 AM CSTTornado WarningLIXLivingston, Saint Helena30 min
Dec 10, 7:53 AM CSTTornado WarningLIXWashington37 min
Dec 10, 7:56 AM CSTSevere Thunderstorm WarningLIXLivingston, Saint Helena, Tangipahoa34 min
Dec 10, 8:20 AM CSTSevere Thunderstorm WarningLIXAscension, Assumption, Iberville, Saint James40 min
Dec 10, 8:23 AM CSTSevere Thunderstorm WarningLIXSaint Tammany, Tangipahoa, Washington52 min
Dec 10, 8:46 AM CSTSevere Thunderstorm WarningLIXEast Baton Rouge, Livingston, Saint Helena, Saint Tammany, Tangipahoa29 min
Dec 10, 8:58 AM CSTSevere Thunderstorm WarningLIXAscension, Saint James, Saint John the Baptist47 min
Dec 10, 9:00 AM CSTSpecial Marine WarningLIX60 min
Dec 10, 9:10 AM CSTSevere Thunderstorm WarningLIXWashington65 min
Dec 10, 9:19 AM CSTTornado WarningLIXWashington26 min
Dec 10, 9:25 AM CSTSevere Thunderstorm WarningLIXSaint Tammany, Tangipahoa, Washington65 min
Dec 10, 9:43 AM CSTSevere Thunderstorm WarningLIXAssumption, Lafourche, Saint Charles, Saint James, Saint John the Baptist47 min
Dec 10, 9:55 AM CSTSpecial Marine WarningLIX50 min
Dec 10, 10:18 AM CSTSevere Thunderstorm WarningLIXSaint Tammany42 min
Dec 10, 10:42 AM CSTSpecial Marine WarningLIX33 min

Nearby

Tornado Warnings in Louisiana, 2012Every tornado warning in 2012Tornadoes 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive.