Alert archive / Mississippi / Severe Thunderstorm Watches in 2009

Severe Thunderstorm Watch 152

April 13, 20097 parishes in Louisiana; 20 counties in Mississippi

The Storm Prediction Center issued this severe thunderstorm watch at Apr 13, 2009, 4:16 PM CDT for 7 parishes in Louisiana; 20 counties in Mississippi. It was in force for 4 hr.

The area

The outline as issued.

The facts

Issued: Apr 13, 2009, 4:16 PM CDT (21:16 UTC)
Expired: Apr 13, 2009, 8:00 PM CDT
In force: 4 hr
Issued by: the Storm Prediction Center
Largest hail expected: 2 in
Strongest gust expected: 60 kt

All 27 counties

East Baton Rouge Parish, LA, East Feliciana Parish, LA, Livingston Parish, LA, Saint Helena Parish, LA, Saint Tammany Parish, LA, Tangipahoa Parish, LA, Washington Parish, LA, Amite County, MS, Clarke County, MS, Covington County, MS, Forrest County, MS, Jasper County, MS, Jefferson Davis County, MS, Jones County, MS, Lamar County, MS, Lauderdale County, MS, Lawrence County, MS, Lincoln County, MS, Marion County, MS, Newton County, MS, Pearl River County, MS, Perry County, MS, Pike County, MS, Simpson County, MS, Smith County, MS, Walthall County, MS, Wayne County, MS

The radar

The Jackson/Brandon,MS radar (KDGX), 88 km from the middle of the area, began a volume at 21:18 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: 5%
Ten or more severe wind reports: 30%
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: 30%
Six or more combined severe hail and wind reports: 70%

Warnings issued inside it

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

Issued	Product	Office	Counties	Lasted
Apr 13, 4:59 PM CDT	Severe Thunderstorm Warning	JAN	Forrest, Jones	46 min
Apr 13, 5:09 PM CDT	Severe Thunderstorm Warning	JAN	Lawrence	33 min
Apr 13, 5:32 PM CDT	Severe Thunderstorm Warning	JAN	Jefferson Davis, Simpson	43 min
Apr 13, 6:11 PM CDT	Severe Thunderstorm Warning	JAN	Simpson, Smith	49 min
Apr 13, 7:23 PM CDT	Severe Thunderstorm Warning	JAN	Lamar, Marion	26 min
Apr 13, 7:34 PM CDT	Severe Thunderstorm Warning	JAN	Covington, Lamar	29 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
Apr 12, 8:07 PM CDT	Mesoscale Discussion	SPC	Ascension, Assumption, Livingston, Orleans, Saint Bernard, Saint Charles and 6 more	53 min
Apr 12, 8:30 PM CDT	Tornado Watch	SPC	Ascension, East Baton Rouge, East Feliciana, Iberville, Livingston, Saint Helena and 4 more	6 hr
Apr 12, 10:42 PM CDT	Mesoscale Discussion	SPC	Saint Tammany, Tangipahoa, Washington	93 min
Apr 13, 1:39 PM CDT	Mesoscale Discussion	SPC	Ascension, Avoyelles, Concordia, East Baton Rouge, East Feliciana, Iberville and 8 more	66 min
Apr 13, 6:55 PM CDT	Mesoscale Discussion	SPC	Washington	95 min
Apr 13, 1:57 AM CDT	Mesoscale Discussion	SPC	George, Jackson	63 min
Apr 13, 2:33 AM CDT	Tornado Watch	SPC	George, Greene, Hancock, Harrison, Jackson, Stone	7 hr
Apr 13, 7:27 AM CDT	Mesoscale Discussion	SPC	Jackson	2 hr
Apr 13, 12:09 PM CDT	Mesoscale Discussion	SPC	Alcorn, Itawamba, Prentiss, Tishomingo	66 min
Apr 13, 5:52 PM CDT	Mesoscale Discussion	SPC	Lowndes, Noxubee	53 min

Nearby

Severe Thunderstorm Watches in Mississippi, 2009 Severe Thunderstorm Watches in Louisiana, 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; radar from the NEXRAD Level II archive.