Alert archive / Louisiana / Tornado Watches in 2008

Tornado Watch 51

February 12, 200838 parishes in Louisiana; 18 counties in Mississippi

The Storm Prediction Center issued this tornado watch at Feb 12, 2008, 10:25 AM CST for 38 parishes in Louisiana; 18 counties in Mississippi. It was in force for 7 hr.

The area

The outline as issued.

The facts

Issued: Feb 12, 2008, 10:25 AM CST (16:25 UTC)
Expired: Feb 12, 2008, 5:24 PM CST
In force: 7 hr
Issued by: the Storm Prediction Center
Largest hail expected: 1.5 in
Strongest gust expected: 60 kt

All 56 counties

Acadia Parish, LA, Allen Parish, LA, Ascension Parish, LA, Assumption Parish, LA, Avoyelles Parish, LA, Beauregard Parish, LA, Calcasieu Parish, LA, Cameron Parish, LA, East Baton Rouge Parish, LA, East Feliciana Parish, LA, Evangeline Parish, LA, Iberia Parish, LA, Iberville Parish, LA, Jefferson Davis Parish, LA, Jefferson Parish, LA, Lafayette Parish, LA, Lafourche Parish, LA, Livingston Parish, LA, Orleans Parish, LA, Plaquemines Parish, LA, Pointe Coupee Parish, LA, Rapides Parish, LA, Saint Bernard Parish, LA, Saint Charles Parish, LA, Saint Helena Parish, LA, Saint James Parish, LA, Saint John the Baptist Parish, LA, Saint Landry Parish, LA, Saint Martin Parish, LA, Saint Tammany Parish, LA, St. Mary Parish, LA, Tangipahoa Parish, LA, Terrebonne Parish, LA, Vermilion Parish, LA, Vernon Parish, LA, Washington Parish, LA, West Baton Rouge Parish, LA, West Feliciana Parish, LA, Adams County, MS, Amite County, MS, Covington County, MS, Forrest County, MS, Franklin County, MS, Hancock County, MS, Harrison County, MS, Jefferson County, MS, Jefferson Davis County, MS, Jones County, MS, Lamar County, MS, Lawrence County, MS, Lincoln County, MS, Marion County, MS, Pearl River County, MS, Pike County, MS, Walthall County, MS, Wilkinson County, MS

The radar

The Lake Charles radar (KLCH), 129 km from the middle of the area, began a volume at 16:24 UTC, the scan nearest the moment this went out.

Open the radar archive at this moment

The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.

What SPC expected

The probabilities SPC published with the watch, for the watch area over its life.

Two or more tornadoes: 20%
One or more EF2 to EF5 tornadoes: 10%
Ten or more severe wind reports: 40%
One or more gusts of 65 knots or more: 20%
Ten or more severe hail reports: 40%
One or more hailstones of 2 inches or more: 20%
Six or more combined severe hail and wind reports: 80%

Warnings issued inside it

46 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.

Issued	Product	Office	Counties	Lasted
Feb 12, 11:20 AM CST	Severe Thunderstorm Warning	LCH	Allen, Avoyelles, Beauregard, Evangeline, Rapides, Saint Landry and 1 more	55 min
Feb 12, 11:25 AM CST	Severe Thunderstorm Warning	LCH	Acadia, Allen, Calcasieu, Evangeline, Jefferson Davis, Saint Landry	35 min
Feb 12, 11:39 AM CST	Severe Thunderstorm Warning	JAN	Adams	51 min
Feb 12, 11:50 AM CST	Tornado Warning	LIX	Jefferson, Lafourche, Plaquemines	25 min
Feb 12, 11:56 AM CST	Severe Thunderstorm Warning	LIX	Pointe Coupee, West Feliciana	47 min
Feb 12, 12:02 PM CST	Severe Thunderstorm Warning	LCH	Acadia, Allen, Evangeline, Jefferson Davis, Lafayette, Saint Landry and 1 more	58 min
Feb 12, 12:02 PM CST	Severe Thunderstorm Warning	JAN	Adams, Franklin, Jefferson, Lincoln	43 min
Feb 12, 12:11 PM CST	Tornado Warning	LIX	Jefferson, Plaquemines	34 min
Feb 12, 12:16 PM CST	Severe Thunderstorm Warning	LCH	Allen, Avoyelles, Beauregard, Calcasieu, Evangeline, Jefferson Davis and 2 more	44 min
Feb 12, 12:26 PM CST	Severe Thunderstorm Warning	JAN	Copiah, Franklin, Lawrence, Lincoln, Simpson	49 min
Feb 12, 12:27 PM CST	Severe Thunderstorm Warning	LIX	East Baton Rouge, East Feliciana, Saint Helena, Tangipahoa	48 min
Feb 12, 12:46 PM CST	Severe Thunderstorm Warning	LIX	Plaquemines, Saint Bernard	29 min
Feb 12, 12:54 PM CST	Severe Thunderstorm Warning	JAN	Jefferson Davis, Lawrence	51 min
Feb 12, 12:55 PM CST	Severe Thunderstorm Warning	LIX	East Feliciana, Saint Helena, Tangipahoa	35 min
Feb 12, 12:56 PM CST	Severe Thunderstorm Warning	LCH	Calcasieu, Cameron	64 min
Feb 12, 1:07 PM CST	Severe Thunderstorm Warning	JAN	Lamar	38 min
Feb 12, 1:09 PM CST	Tornado Warning	LIX	Saint Helena, Tangipahoa	36 min
Feb 12, 1:13 PM CST	Severe Thunderstorm Warning	LCH	Acadia, Iberia, Lafayette, Saint Landry, Saint Martin, Vermilion	47 min
Feb 12, 1:15 PM CST	Tornado Warning	LIX	Plaquemines, Saint Bernard	30 min
Feb 12, 1:22 PM CST	Severe Thunderstorm Warning	JAN	Covington, Jefferson Davis, Lamar, Lawrence, Marion	38 min
Feb 12, 1:26 PM CST	Severe Thunderstorm Warning	LCH	Calcasieu, Cameron, Jefferson Davis	64 min
Feb 12, 1:26 PM CST	Severe Thunderstorm Warning	JAN	Forrest, Jones	49 min
Feb 12, 1:26 PM CST	Tornado Warning	LIX	Pike, Walthall	34 min
Feb 12, 1:29 PM CST	Tornado Warning	JAN	Covington, Jefferson Davis, Simpson, Smith	46 min
Feb 12, 1:40 PM CST	Tornado Warning	LIX	Saint Tammany, Tangipahoa, Washington	35 min
Feb 12, 1:42 PM CST	Severe Thunderstorm Warning	LIX	Tangipahoa, Washington	48 min
Feb 12, 1:50 PM CST	Severe Thunderstorm Warning	LIX	Livingston, Saint Tammany, Tangipahoa	40 min
Feb 12, 1:52 PM CST	Tornado Warning	JAN	Covington, Jasper, Jones	53 min
Feb 12, 1:52 PM CST	Tornado Warning	JAN	Lamar, Marion	38 min
Feb 12, 1:54 PM CST	Tornado Warning	LIX	Washington	21 min
Feb 12, 2:03 PM CST	Tornado Warning	JAN	Jones	42 min
Feb 12, 2:06 PM CST	Severe Thunderstorm Warning	JAN	Forrest	39 min
Feb 12, 2:13 PM CST	Tornado Warning	LIX	Saint Tammany, Washington	32 min
Feb 12, 2:15 PM CST	Tornado Warning	JAN	Lamar, Marion	35 min
Feb 12, 2:26 PM CST	Severe Thunderstorm Warning	LIX	Jefferson, Orleans, Saint Charles	34 min
Feb 12, 2:30 PM CST	Severe Thunderstorm Warning	LIX	Saint Tammany	60 min
Feb 12, 2:32 PM CST	Severe Thunderstorm Warning	LIX	Pearl River	13 min
Feb 12, 2:35 PM CST	Severe Thunderstorm Warning	LIX	Assumption, Lafourche, Saint James, Saint John the Baptist	25 min
Feb 12, 2:35 PM CST	Tornado Warning	JAN	Covington, Forrest, Jones	40 min
Feb 12, 2:36 PM CST	Severe Thunderstorm Warning	JAN	Forrest	39 min
Feb 12, 2:45 PM CST	Tornado Warning	LIX	Hancock, Pearl River	15 min
Feb 12, 2:51 PM CST	Severe Thunderstorm Warning	LIX	Jefferson, Lafourche, Orleans, Plaquemines, Saint Bernard, Saint Charles and 1 more	41 min
Feb 12, 3:00 PM CST	Tornado Warning	LIX	Hancock, Harrison, Pearl River	15 min
Feb 12, 3:10 PM CST	Severe Thunderstorm Warning	LIX	Terrebonne	35 min
Feb 12, 3:15 PM CST	Severe Thunderstorm Warning	LIX	Hancock, Harrison, Jackson	45 min
Feb 12, 4:20 PM CST	Severe Thunderstorm Warning	LIX	Plaquemines	40 min

Discussions around it

SPC mesoscale discussions over the same counties from four hours before the watch to its end.

The nearest sounding before it

Lake Charles Mun, LA (KLCH), launched 12:00Z, 4.4 hours before the alert went out and 128 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: 583 J/kg
Mixed-layer CIN: -14 J/kg
Mixed-layer LCL: 595 m above ground
0-6 km bulk shear: 29 kt
0-1 km storm-relative helicity: 175 m²/s²
0-3 km storm-relative helicity: 250 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 3.0

Open this sounding in Storm Lab

SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Feb 12, 1:17 AM CST	Mesoscale Discussion	SPC	Bossier, Caddo	88 min
Feb 12, 7:50 AM CST	Mesoscale Discussion	SPC	Beauregard, Bienville, Claiborne, De Soto, Grant, Jackson and 7 more	55 min
Feb 12, 9:53 AM CST	Mesoscale Discussion	SPC	Acadia, Allen, Ascension, Assumption, Avoyelles, Beauregard and 33 more	67 min
Feb 12, 12:40 PM CST	Mesoscale Discussion	SPC	Acadia, Ascension, Assumption, Calcasieu, Cameron, East Baton Rouge and 27 more	65 min
Feb 12, 2:19 PM CST	Mesoscale Discussion	SPC	Ascension, Assumption, Iberia, Jefferson, Lafourche, Orleans and 11 more	116 min
Feb 12, 12:12 PM CST	Mesoscale Discussion	SPC	Clarke, George, Greene, Jackson, Lauderdale, Perry and 1 more	2 hr
Feb 12, 12:34 PM CST	Tornado Watch	SPC	Clarke, George, Greene, Jackson, Jasper, Kemper and 9 more	7 hr

Nearby

Tornado Watches in Louisiana, 2008 Tornado Watches in Mississippi, 2008 Every tornado watch in 2008

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; radar from the NEXRAD Level II archive.