Alert archive / Louisiana / Tornado Watches in 2006

Tornado Watch 837

October 19, 200631 parishes in Louisiana; 21 counties in Mississippi

The Storm Prediction Center issued this tornado watch at Oct 19, 2006, 6:31 AM CDT for 31 parishes in Louisiana; 21 counties in Mississippi. It was in force for 7 hr.

The area

The outline as issued.

The facts

Issued: Oct 19, 2006, 6:31 AM CDT (11:31 UTC)
Expired: Oct 19, 2006, 2:00 PM CDT
In force: 7 hr
Issued by: the Storm Prediction Center
Largest hail expected: 0.5 in
Strongest gust expected: 60 kt

All 52 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, Catahoula Parish, LA, Concordia Parish, LA, East Baton Rouge Parish, LA, East Feliciana Parish, LA, Evangeline Parish, LA, Iberia Parish, LA, Iberville Parish, LA, Jefferson Davis Parish, LA, Lafayette Parish, LA, Livingston Parish, LA, Pointe Coupee 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, Vermilion Parish, LA, Washington Parish, LA, West Baton Rouge Parish, LA, West Feliciana Parish, LA, Adams County, MS, Amite County, MS, Copiah County, MS, Covington County, MS, Forrest County, MS, Franklin County, MS, Hancock County, MS, Jasper 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, Simpson County, MS, Smith County, MS, Walthall County, MS, Wilkinson County, MS

What SPC expected

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

Two or more tornadoes: 50%
One or more EF2 to EF5 tornadoes: 20%
Ten or more severe wind reports: 30%
One or more gusts of 65 knots or more: 30%
Ten or more severe hail reports: 5%
One or more hailstones of 2 inches or more: 5%
Six or more combined severe hail and wind reports: 50%

Warnings issued inside it

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

Issued	Product	Office	Counties	Lasted
Oct 19, 6:31 AM CDT	Flash Flood Warning	LCH	Beauregard, Calcasieu	119 min
Oct 19, 6:43 AM CDT	Severe Thunderstorm Warning	LCH	Allen, Beauregard, Calcasieu, Cameron	62 min
Oct 19, 6:53 AM CDT	Severe Thunderstorm Warning	LCH	Avoyelles	67 min
Oct 19, 6:59 AM CDT	Tornado Warning	JAN	Catahoula	35 min
Oct 19, 7:21 AM CDT	Tornado Warning	JAN	Concordia	39 min
Oct 19, 7:30 AM CDT	Flash Flood Warning	LCH	Allen, Jefferson Davis	2 hr
Oct 19, 7:47 AM CDT	Severe Thunderstorm Warning	LCH	Acadia	58 min
Oct 19, 7:49 AM CDT	Severe Thunderstorm Warning	LCH	Evangeline, Saint Landry	56 min
Oct 19, 7:54 AM CDT	Flash Flood Warning	LCH	Acadia	2 hr
Oct 19, 7:54 AM CDT	Severe Thunderstorm Warning	JAN	Adams	66 min
Oct 19, 7:56 AM CDT	Severe Thunderstorm Warning	LIX	Wilkinson	64 min
Oct 19, 8:23 AM CDT	Severe Thunderstorm Warning	JAN	Franklin	67 min
Oct 19, 8:29 AM CDT	Severe Thunderstorm Warning	LIX	Pointe Coupee, West Feliciana	61 min
Oct 19, 8:40 AM CDT	Severe Thunderstorm Warning	JAN	Claiborne, Jefferson	35 min
Oct 19, 8:46 AM CDT	Tornado Warning	LIX	Wilkinson	29 min
Oct 19, 9:09 AM CDT	Severe Thunderstorm Warning	LCH	Saint Martin	36 min
Oct 19, 9:15 AM CDT	Severe Thunderstorm Warning	LIX	Amite, Wilkinson	30 min
Oct 19, 9:16 AM CDT	Severe Thunderstorm Warning	JAN	Claiborne, Copiah, Jefferson	59 min
Oct 19, 9:21 AM CDT	Severe Thunderstorm Warning	LIX	East Baton Rouge, East Feliciana, Iberville, Pointe Coupee, West Baton Rouge	54 min
Oct 19, 9:24 AM CDT	Tornado Warning	JAN	Claiborne, Copiah, Jefferson	48 min
Oct 19, 9:30 AM CDT	Severe Thunderstorm Warning	JAN	Franklin	30 min
Oct 19, 10:05 AM CDT	Severe Thunderstorm Warning	LIX	Ascension, Livingston, Saint Helena, Tangipahoa	40 min
Oct 19, 12:14 PM CDT	Tornado Warning	LIX	Pearl River	31 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 00:00Z, 11.5 hours before the alert went out and 141 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: 1015 J/kg
Mixed-layer CIN: -16 J/kg
Mixed-layer LCL: 579 m above ground
0-6 km bulk shear: 57 kt
0-1 km storm-relative helicity: 149 m²/s²
0-3 km storm-relative helicity: 251 m²/s²
Significant tornado parameter: 1.1
Supercell composite: 6.3

Open this sounding in Storm Lab

SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Oct 18, 11:52 PM CDT	Mesoscale Discussion	SPC	Acadia, Allen, Beauregard, Calcasieu, Cameron, Evangeline and 3 more	113 min
Oct 19, 3:03 AM CDT	Mesoscale Discussion	SPC	Acadia, Allen, Avoyelles, Beauregard, Calcasieu, Cameron and 21 more	117 min
Oct 19, 6:11 AM CDT	Mesoscale Discussion	SPC	Acadia, Allen, Ascension, Assumption, Avoyelles, Beauregard and 26 more	94 min
Oct 19, 10:12 AM CDT	Mesoscale Discussion	SPC	Ascension, Assumption, East Baton Rouge, Iberia, Iberville, Jefferson and 14 more	2 hr
Oct 19, 12:08 PM CDT	Mesoscale Discussion	SPC	Orleans, Saint Bernard, Saint Charles, Saint John the Baptist, Saint Tammany	2 hr
Oct 19, 1:16 PM CDT	Mesoscale Discussion	SPC	Jefferson, Lafourche, Orleans, Plaquemines, Saint Bernard, Saint Charles and 1 more	59 min
Oct 19, 1:17 PM CDT	Severe Thunderstorm Watch	SPC	George, Greene, Jackson	4 hr

Nearby

Tornado Watches in Louisiana, 2006 Tornado Watches in Mississippi, 2006 Every tornado watch in 2006

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.