Alert archive / Mississippi / Tornado Watches in 2008

Tornado Watch 823

August 12, 20084 states

The Storm Prediction Center issued this tornado watch at Aug 12, 2008, 2:21 PM CDT for 4 states. It was in force for 8 hr.

The area

The outline as issued.

The facts

Issued: Aug 12, 2008, 2:21 PM CDT (19:21 UTC)
Expired: Aug 12, 2008, 10:00 PM CDT
In force: 8 hr
Issued by: the Storm Prediction Center
Largest hail expected: 1 in
Strongest gust expected: 60 kt

All 63 counties

Baldwin County, AL, Butler County, AL, Choctaw County, AL, Clarke County, AL, Conecuh County, AL, Covington County, AL, Crenshaw County, AL, Escambia County, AL, Mobile County, AL, Monroe County, AL, Washington County, AL, Wilcox County, AL, Escambia County, FL, Okaloosa County, FL, Santa Rosa County, FL, Ascension Parish, LA, Assumption Parish, LA, East Baton Rouge Parish, LA, East Feliciana Parish, LA, Iberville Parish, LA, Jefferson 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 Tammany Parish, LA, Tangipahoa Parish, LA, Terrebonne 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, 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, Lamar County, MS, Lawrence County, MS, Lincoln County, MS, Marion County, MS, Pearl River County, MS, Perry County, MS, Pike County, MS, Simpson County, MS, Smith County, MS, Stone County, MS, Walthall County, MS, Wayne 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: 40%
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: 10%
One or more hailstones of 2 inches or more: 5%
Six or more combined severe hail and wind reports: 50%

Warnings issued inside it

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

Issued	Product	Office	Counties	Lasted
Aug 12, 2:39 PM CDT	Severe Thunderstorm Warning	JAN	Jefferson Davis, Lawrence, Marion	51 min
Aug 12, 2:47 PM CDT	Severe Thunderstorm Warning	JAN	Covington, Jefferson Davis, Lawrence	43 min
Aug 12, 3:18 PM CDT	Severe Thunderstorm Warning	JAN	Covington, Forrest, Jefferson Davis, Jones, Lamar	42 min
Aug 12, 3:43 PM CDT	Severe Thunderstorm Warning	LIX	Saint Tammany, Tangipahoa, Washington	47 min
Aug 12, 3:56 PM CDT	Severe Thunderstorm Warning	LIX	Saint Tammany	49 min
Aug 12, 3:56 PM CDT	Severe Thunderstorm Warning	JAN	Forrest, Jones, Lamar	49 min
Aug 12, 4:08 PM CDT	Severe Thunderstorm Warning	LIX	Pearl River	37 min
Aug 12, 4:08 PM CDT	Severe Thunderstorm Warning	MOB	Greene, Perry, Wayne	52 min
Aug 12, 4:17 PM CDT	Tornado Warning	JAN	Jones	13 min
Aug 12, 4:20 PM CDT	Tornado Warning	MOB	Greene, Perry, Wayne	40 min
Aug 12, 4:45 PM CDT	Severe Thunderstorm Warning	LIX	Hancock, Harrison, Pearl River	30 min
Aug 12, 4:58 PM CDT	Severe Thunderstorm Warning	MOB	Washington	47 min
Aug 12, 5:05 PM CDT	Severe Thunderstorm Warning	MOB	Escambia, Santa Rosa	40 min
Aug 12, 5:06 PM CDT	Severe Thunderstorm Warning	MOB	George, Stone	54 min
Aug 12, 5:13 PM CDT	Tornado Warning	MOB	Washington	37 min
Aug 12, 5:14 PM CDT	Severe Thunderstorm Warning	LIX	Hancock, Harrison, Jackson	61 min
Aug 12, 5:33 PM CDT	Severe Thunderstorm Warning	MOB	Clarke, Mobile, Washington	57 min
Aug 12, 6:02 PM CDT	Tornado Warning	MOB	Baldwin, Clarke, Monroe, Washington	43 min
Aug 12, 6:15 PM CDT	Severe Thunderstorm Warning	LIX	Jackson	30 min
Aug 12, 6:32 PM CDT	Severe Thunderstorm Warning	MOB	Baldwin, Clarke, Escambia, Mobile, Monroe, Washington	28 min
Aug 12, 6:44 PM CDT	Tornado Warning	MOB	Baldwin, Escambia, Monroe	17 min
Aug 12, 6:59 PM CDT	Severe Thunderstorm Warning	MOB	Baldwin, Conecuh, Escambia, Monroe	46 min
Aug 12, 7:02 PM CDT	Severe Thunderstorm Warning	MOB	Butler, Conecuh, Monroe	38 min
Aug 12, 7:39 PM CDT	Severe Thunderstorm Warning	MOB	Conecuh, Covington, Escambia, Monroe	36 min
Aug 12, 8:35 PM CDT	Severe Thunderstorm Warning	MOB	Covington	55 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

Slidell Radar S, LA (KSIL), launched 12:00Z, 7.4 hours before the alert went out and 86 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: 3027 J/kg
Mixed-layer CIN: -1 J/kg
Mixed-layer LCL: 499 m above ground
0-6 km bulk shear: 21 kt
0-1 km storm-relative helicity: 86 m²/s²
0-3 km storm-relative helicity: 91 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
Aug 12, 11:10 AM CDT	Mesoscale Discussion	SPC	Baldwin, Mobile, Washington	2 hr
Aug 12, 5:58 PM CDT	Mesoscale Discussion	SPC	Baldwin, Choctaw, Clarke, Marengo, Mobile, Monroe and 2 more	62 min

Nearby

Tornado Watches in Mississippi, 2008 Tornado Watches in Louisiana, 2008 Tornado Watches in Alabama, 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.