Alert archive / Louisiana / Tornado Warnings in 2012

Tornado Warning 103, NWS New Orleans, LA

December 25, 2012Saint Tammany Parish, Louisiana

NWS New Orleans, LA issued this tornado warning at Dec 25, 2012, 2:59 PM CST for Saint Tammany 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: Dec 25, 2012, 2:59 PM CST (20:59 UTC)
Expired: Dec 25, 2012, 3:30 PM CST
In force: 31 min
Issued by: NWS New Orleans, LA
Area: Storm-based polygon

County Saint Tammany 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
Dec 25, 12:58 PM CST	Tornado Watch PDS	SPC	9 hr

The nearest sounding before it

Slidell Radar S, LA (KSIL), launched 12:00Z, 9.0 hours before the alert went out and 25 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: 790 J/kg
Mixed-layer CIN: -14 J/kg
Mixed-layer LCL: 576 m above ground
0-6 km bulk shear: 46 kt
0-1 km storm-relative helicity: 181 m²/s²
0-3 km storm-relative helicity: 237 m²/s²
Significant tornado parameter: 1.1
Supercell composite: 10.0

Open this sounding in Storm Lab

The text

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

252 
WFUS54 KLIX 252059
TORLIX
LAC103-252130-
/O.NEW.KLIX.TO.W.0103.121225T2059Z-121225T2130Z/

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE NEW ORLEANS LA
259 PM CST TUE DEC 25 2012

THE NATIONAL WEATHER SERVICE IN NEW ORLEANS HAS ISSUED A

* TORNADO WARNING FOR...
  CENTRAL ST. TAMMANY PARISH IN SOUTHEAST LOUISIANA...
  THIS INCLUDES THE CITY OF MANDEVILLE...

* UNTIL 330 PM CST

* AT 254 PM CST...NATIONAL WEATHER SERVICE METEOROLOGISTS DETECTED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO 16 MILES
  SOUTHWEST OF MANDEVILLE...OR 12 MILES NORTH OF METAIRIE...MOVING
  NORTHEAST AT 50 MPH.

* OTHER LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO
  LACOMBE AND PEARL RIVER

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 800 PM CST TUESDAY EVENING
FOR SOUTHEAST LOUISIANA AND SOUTHERN MISSISSIPPI.

&&

LAT...LON 3052 8977 3043 8967 3040 8968 3024 8993
      3025 8998 3026 9000 3030 9000 3031 9004
      3035 9007 3036 9012 3037 9012 3059 8982
TIME...MOT...LOC 2059Z 231DEG 43KT 3021 9016

$$

1 follow-up statement

564 
WWUS54 KLIX 252133
SVSLIX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE NEW ORLEANS LA
333 PM CST TUE DEC 25 2012

LAC103-252143-
/O.EXP.KLIX.TO.W.0103.000000T0000Z-121225T2130Z/
ST. TAMMANY LA-
333 PM CST TUE DEC 25 2012

...THE TORNADO WARNING FOR CENTRAL ST. TAMMANY PARISH HAS EXPIRED...

A TORNADO WATCH REMAINS IN EFFECT UNTIL 800 PM CST TUESDAY EVENING
FOR SOUTHEAST LOUISIANA AND SOUTHERN MISSISSIPPI.

LAT...LON 3052 8977 3043 8967 3040 8968 3024 8993
      3025 8998 3026 9000 3030 9000 3031 9004
      3035 9007 3036 9012 3037 9012 3059 8982
TIME...MOT...LOC 2059Z 228DEG 42KT 3022 9013

$$

The office that day

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

Issued	Product	Office	Counties	Lasted
Dec 24, 8:34 PM CST	Dense Fog Advisory	LIX	Saint Bernard, Saint John the Baptist	9 hr
Dec 24, 9:03 PM CST	Marine Dense Fog Advisory	LIX		9 hr
Dec 25, 4:27 AM CST	Gale Warning	LIX		26 hr
Dec 25, 4:27 AM CST	Small Craft Advisory	LIX		35 hr
Dec 25, 6:44 AM CST	Severe Thunderstorm Warning	LIX	East Baton Rouge, Iberville, Pointe Coupee, West Baton Rouge	31 min
Dec 25, 10:28 AM CST	Wind Advisory	LIX	Assumption, East Baton Rouge, Iberville, Pointe Coupee, Saint Bernard, Saint James and 2 more	20 hr
Dec 25, 1:45 PM CST	Severe Thunderstorm Warning	LIX	East Feliciana, Pointe Coupee, West Feliciana	60 min
Dec 25, 1:52 PM CST	Tornado Warning	LIX	East Feliciana, Pointe Coupee, West Feliciana	53 min
Dec 25, 1:57 PM CST	Tornado Warning	LIX	Lafourche, Saint Charles, Saint James, Saint John the Baptist	33 min
Dec 25, 1:58 PM CST	Special Marine Warning	LIX		62 min
Dec 25, 2:07 PM CST	Tornado Warning	LIX	Saint Tammany, Tangipahoa, Washington	38 min
Dec 25, 2:17 PM CST	Tornado Warning	LIX	Jefferson, Lafourche, Saint Charles, Saint John the Baptist	43 min
Dec 25, 2:27 PM CST	Special Marine Warning	LIX		33 min
Dec 25, 2:30 PM CST	Tornado Warning	LIX	East Feliciana, Saint Helena	45 min
Dec 25, 2:38 PM CST	Tornado Warning	LIX	Pointe Coupee, West Feliciana	37 min
Dec 25, 2:41 PM CST	Tornado Warning	LIX	East Feliciana	34 min
Dec 25, 2:50 PM CST	Tornado Warning	LIX	Jefferson, Orleans, Saint Charles	25 min
Dec 25, 2:54 PM CST	Tornado Warning	LIX	Saint Tammany	36 min
Dec 25, 2:58 PM CST	Tornado Warning	LIX	East Baton Rouge	32 min
Dec 25, 3:02 PM CST	Tornado Warning	LIX	Jefferson, Orleans, Saint Charles	28 min
Dec 25, 3:05 PM CST	Special Marine Warning	LIX		40 min
Dec 25, 3:13 PM CST	Tornado Warning	LIX	East Baton Rouge, East Feliciana, Livingston, Saint Helena	47 min
Dec 25, 3:28 PM CST	Severe Thunderstorm Warning	LIX	Ascension, East Baton Rouge, Iberville, Livingston, West Baton Rouge	62 min
Dec 25, 3:46 PM CST	Tornado Warning	LIX	Saint Helena, Tangipahoa	44 min
Dec 25, 3:49 PM CST	Special Marine Warning	LIX		26 min
Dec 25, 3:54 PM CST	Severe Thunderstorm Warning	LIX	Washington	66 min
Dec 25, 3:58 PM CST	Tornado Warning	LIX	Jefferson, Lafourche, Plaquemines, Saint Bernard	16 min
Dec 25, 4:01 PM CST	Severe Thunderstorm Warning	LIX	Saint Tammany	44 min
Dec 25, 4:11 PM CST	Severe Thunderstorm Warning	LIX	Ascension, Livingston, Saint Helena, Saint Tammany, Tangipahoa, Washington	64 min
Dec 25, 4:15 PM CST	Special Marine Warning	LIX		45 min
Dec 25, 4:39 PM CST	Special Marine Warning	LIX		96 min
Dec 25, 4:47 PM CST	Severe Thunderstorm Warning	LIX	Saint John the Baptist, Saint Tammany, Tangipahoa, Washington	58 min
Dec 25, 5:09 PM CST	Severe Thunderstorm Warning	LIX	Assumption, Lafourche, Saint John the Baptist, Terrebonne	47 min
Dec 25, 5:27 PM CST	Special Marine Warning	LIX		63 min

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.