Alert archive / Mississippi / Severe Thunderstorm Watches in 2011

Severe Thunderstorm Watch 50

March 14, 201122 counties in Alabama; 10 parishes in Louisiana; 38 counties in Mississippi

The Storm Prediction Center issued this severe thunderstorm watch at Mar 14, 2011, 1:22 PM CDT for 22 counties in Alabama; 10 parishes in Louisiana; 38 counties in Mississippi. It was in force for 5 hr.

The area

The outline as issued.

The facts

Issued: Mar 14, 2011, 1:22 PM CDT (18:22 UTC)
Expired: Mar 14, 2011, 6:16 PM CDT
In force: 5 hr
Issued by: the Storm Prediction Center
Largest hail expected: 1 in
Strongest gust expected: 60 kt

All 70 counties

Bibb County, AL, Blount County, AL, Choctaw County, AL, Clarke County, AL, Cullman County, AL, Fayette County, AL, Greene County, AL, Hale County, AL, Jefferson County, AL, Lamar County, AL, Lawrence County, AL, Marengo County, AL, Marion County, AL, Marshall County, AL, Morgan County, AL, Perry County, AL, Pickens County, AL, Sumter County, AL, Tuscaloosa County, AL, Walker County, AL, Washington County, AL, Winston County, AL, East Baton Rouge Parish, LA, East Feliciana Parish, LA, Livingston Parish, LA, Pointe Coupee Parish, LA, Saint Helena Parish, LA, Saint Tammany Parish, LA, Tangipahoa Parish, LA, Washington Parish, LA, West Baton Rouge Parish, LA, West Feliciana Parish, LA, Amite County, MS, Clarke County, MS, Copiah County, MS, Covington County, MS, Forrest County, MS, Franklin County, MS, George County, MS, Greene County, MS, Hancock County, MS, Harrison County, MS, Jackson County, MS, Jasper County, MS, Jefferson Davis County, MS, Jones County, MS, Kemper County, MS, Lamar County, MS, Lauderdale County, MS, Lawrence County, MS, Leake County, MS, Lincoln County, MS, Lowndes County, MS, Marion County, MS, Neshoba County, MS, Newton County, MS, Noxubee County, MS, Oktibbeha County, MS, Pearl River County, MS, Perry County, MS, Pike County, MS, Rankin County, MS, Scott County, MS, Simpson County, MS, Smith County, MS, Stone County, MS, Walthall County, MS, Wayne County, MS, Wilkinson County, MS, Winston County, MS

The radar

The Jackson/Brandon,MS radar (KDGX), 77 km from the middle of the area, began a volume at 18:22 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: 30%
Ten or more severe hail reports: 20%
One or more hailstones of 2 inches or more: 5%
Six or more combined severe hail and wind reports: 70%

Warnings issued inside it

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

Issued	Product	Office	Counties	Lasted
Mar 14, 1:27 PM CDT	Severe Thunderstorm Warning	JAN	Hinds, Madison, Rankin	48 min
Mar 14, 1:34 PM CDT	Severe Thunderstorm Warning	JAN	Attala, Leake	41 min
Mar 14, 1:41 PM CDT	Severe Thunderstorm Warning	JAN	Hinds, Rankin	49 min
Mar 14, 1:51 PM CDT	Tornado Warning	JAN	Madison, Rankin, Scott	39 min
Mar 14, 1:57 PM CDT	Severe Thunderstorm Warning	JAN	Choctaw, Neshoba, Oktibbeha, Winston	48 min
Mar 14, 2:01 PM CDT	Tornado Warning	JAN	Rankin	31 min
Mar 14, 2:13 PM CDT	Severe Thunderstorm Warning	JAN	Leake, Neshoba, Newton, Rankin, Scott	47 min
Mar 14, 2:27 PM CDT	Severe Thunderstorm Warning	JAN	Rankin, Scott, Smith	48 min
Mar 14, 2:40 PM CDT	Severe Thunderstorm Warning	JAN	Lawrence, Lincoln	50 min
Mar 14, 2:55 PM CDT	Severe Thunderstorm Warning	JAN	Kemper, Neshoba, Newton, Scott	39 min
Mar 14, 3:15 PM CDT	Severe Thunderstorm Warning	JAN	Covington, Simpson, Smith	26 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

Jackson, MS (KJAN), launched 12:00Z, 6.4 hours before the alert went out and 87 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: 52 J/kg
Mixed-layer CIN: -16 J/kg
Mixed-layer LCL: 595 m above ground
0-6 km bulk shear: 34 kt
0-1 km storm-relative helicity: 145 m²/s²
0-3 km storm-relative helicity: 186 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Mar 14, 12:49 PM CDT	Mesoscale Discussion	SPC	Fayette, Franklin, Lamar, Marion, Pickens	56 min
Mar 14, 5:37 PM CDT	Mesoscale Discussion	SPC	Autauga, Baldwin, Bullock, Butler, Calhoun, Chambers and 28 more	83 min

Nearby

Severe Thunderstorm Watches in Mississippi, 2011 Severe Thunderstorm Watches in Alabama, 2011 Severe Thunderstorm Watches in Louisiana, 2011 Every severe thunderstorm watch in 2011

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.