Alert archive / Louisiana / Severe Thunderstorm Watches in 2009

Severe Thunderstorm Watch 1

January 3, 200927 parishes in Louisiana; 18 counties in Mississippi

The Storm Prediction Center issued this severe thunderstorm watch at Jan 3, 2009, 9:33 AM CST for 27 parishes in Louisiana; 18 counties in Mississippi. It was in force for 6 hr.

The area

The outline as issued.

The facts

Issued: Jan 3, 2009, 9:33 AM CST (15:33 UTC)
Expired: Jan 3, 2009, 3:30 PM CST
In force: 6 hr
Issued by: the Storm Prediction Center
Largest hail expected: 1.5 in
Strongest gust expected: 60 kt

All 45 counties

Ascension Parish, LA, Assumption Parish, LA, East Baton Rouge Parish, LA, East Feliciana Parish, LA, Iberia Parish, LA, Iberville Parish, LA, Jefferson Parish, LA, Lafayette Parish, LA, Lafourche Parish, LA, Livingston Parish, LA, Orleans Parish, LA, Plaquemines Parish, LA, Pointe Coupee 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, 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, Jackson 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

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: 5%
Ten or more severe wind reports: 30%
One or more gusts of 65 knots or more: 30%
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: 70%

Warnings issued inside it

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

Issued	Product	Office	Counties	Lasted
Jan 3, 9:38 AM CST	Severe Thunderstorm Warning	LCH	Lafayette, Saint Martin, Vermilion	37 min
Jan 3, 11:10 AM CST	Severe Thunderstorm Warning	LIX	Ascension, East Baton Rouge, East Feliciana, Iberville, Livingston, Saint Helena and 1 more	50 min
Jan 3, 11:53 AM CST	Severe Thunderstorm Warning	JAN	Lamar	52 min
Jan 3, 12:24 PM CST	Severe Thunderstorm Warning	JAN	Covington, Forrest, Jones, Lamar	32 min
Jan 3, 12:37 PM CST	Severe Thunderstorm Warning	LCH	Avoyelles, Evangeline, Saint Landry	23 min
Jan 3, 12:51 PM CST	Severe Thunderstorm Warning	JAN	Covington, Jefferson Davis	28 min
Jan 3, 12:58 PM CST	Severe Thunderstorm Warning	LCH	Avoyelles, Saint Landry	32 min
Jan 3, 1:20 PM CST	Severe Thunderstorm Warning	LIX	Pointe Coupee, West Feliciana	21 min

Discussions around it

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

SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jan 3, 7:32 AM CST	Mesoscale Discussion	SPC	Acadia, Allen, Ascension, Assumption, Cameron, East Baton Rouge and 26 more	88 min
Jan 3, 12:32 PM CST	Mesoscale Discussion	SPC	Ascension, Assumption, Catahoula, Concordia, East Baton Rouge, East Feliciana and 21 more	88 min
Jan 3, 4:27 PM CST	Mesoscale Discussion	SPC	Avoyelles, Caldwell, Catahoula, Concordia, Franklin, Grant and 9 more	33 min
Jan 3, 4:29 PM CST	Severe Thunderstorm Watch	SPC	Caldwell, Catahoula, Concordia, East Carroll, Franklin, Grant and 9 more	3 hr

Nearby

Severe Thunderstorm Watches in Louisiana, 2009 Severe Thunderstorm Watches in Mississippi, 2009 Every severe thunderstorm watch in 2009

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text.