Alert archive / Alabama / Severe Thunderstorm Watches in 2011

Severe Thunderstorm Watch 555

June 26, 20114 states

The Storm Prediction Center issued this severe thunderstorm watch at Jun 26, 2011, 12:05 PM CDT for 4 states. It took effect at Jun 26, 2011, 12:10 PM CDT. It was in force for 8 hr.

The area

The outline as issued.

The facts

Issued: Jun 26, 2011, 12:05 PM CDT (17:05 UTC)
In effect from: Jun 26, 2011, 12:10 PM CDT
Expired: Jun 26, 2011, 8:00 PM CDT
In force: 8 hr
Issued by: the Storm Prediction Center
Largest hail expected: 1.5 in
Strongest gust expected: 60 kt

All 102 counties

Autauga County, AL, Barbour County, AL, Bibb County, AL, Blount County, AL, Bullock County, AL, Calhoun County, AL, Chambers County, AL, Cherokee County, AL, Chilton County, AL, Clay County, AL, Cleburne County, AL, Colbert County, AL, Coosa County, AL, Cullman County, AL, DeKalb County, AL, Elmore County, AL, Etowah County, AL, Fayette County, AL, Franklin County, AL, Jackson County, AL, Jefferson County, AL, Lamar County, AL, Lauderdale County, AL, Lawrence County, AL, Lee County, AL, Limestone County, AL, Lowndes County, AL, Macon County, AL, Madison County, AL, Marion County, AL, Marshall County, AL, Montgomery County, AL, Morgan County, AL, Pickens County, AL, Pike County, AL, Randolph County, AL, Russell County, AL, Shelby County, AL, St. Clair County, AL, Talladega County, AL, Tallapoosa County, AL, Tuscaloosa County, AL, Walker County, AL, Winston County, AL, Clay County, AR, Craighead County, AR, Crittenden County, AR, Cross County, AR, Greene County, AR, Lawrence County, AR, Mississippi County, AR, Poinsett County, AR, Randolph County, AR, Alcorn County, MS, Benton County, MS, Calhoun County, MS, Chickasaw County, MS, DeSoto County, MS, Itawamba County, MS, Lafayette County, MS, Lee County, MS, Marshall County, MS, Monroe County, MS, Panola County, MS, Pontotoc County, MS, Prentiss County, MS, Quitman County, MS, Tallahatchie County, MS, Tate County, MS, Tippah County, MS, Tishomingo County, MS, Tunica County, MS, Union County, MS, Yalobusha County, MS, Bedford County, TN, Chester County, TN, Crockett County, TN, Decatur County, TN, Dyer County, TN, Fayette County, TN, Franklin County, TN, Gibson County, TN, Giles County, TN, Hardeman County, TN, Hardin County, TN, Haywood County, TN, Henderson County, TN, Lake County, TN, Lauderdale County, TN, Lawrence County, TN, Lewis County, TN, Lincoln County, TN, Madison County, TN, Marshall County, TN, Maury County, TN, McNairy County, TN, Moore County, TN, Obion County, TN, Perry County, TN, Shelby County, TN, Tipton County, TN, Wayne County, TN

The radar

The Columbus AFB radar (KGWX), 116 km from the middle of the area, began a volume at 17:08 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: 50%
One or more gusts of 65 knots or more: 30%
Ten or more severe hail reports: 30%
One or more hailstones of 2 inches or more: 20%
Six or more combined severe hail and wind reports: 80%

Warnings issued inside it

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

Issued	Product	Office	Counties	Lasted
Jun 26, 12:30 PM CDT	Severe Thunderstorm Warning	MEG	Chester, Hardeman, Madison	45 min
Jun 26, 12:46 PM CDT	Severe Thunderstorm Warning	MEG	Hardeman, Haywood, Madison	23 min
Jun 26, 1:34 PM CDT	Severe Thunderstorm Warning	HUN	Lauderdale	26 min
Jun 26, 1:34 PM CDT	Severe Thunderstorm Warning	MEG	Hardin	26 min
Jun 26, 1:40 PM CDT	Severe Thunderstorm Warning	OHX	Wayne	20 min
Jun 26, 1:49 PM CDT	Severe Thunderstorm Warning	MEG	Alcorn, Tishomingo	41 min
Jun 26, 1:58 PM CDT	Severe Thunderstorm Warning	HUN	Colbert, Lauderdale, Lawrence	32 min
Jun 26, 2:13 PM CDT	Severe Thunderstorm Warning	MEG	Tishomingo	32 min
Jun 26, 2:31 PM CDT	Severe Thunderstorm Warning	MEG	Tishomingo	44 min
Jun 26, 2:35 PM CDT	Severe Thunderstorm Warning	BMX	Fayette, Lamar, Marion, Walker, Winston	40 min
Jun 26, 2:53 PM CDT	Severe Thunderstorm Warning	BMX	Blount, Etowah	52 min
Jun 26, 3:21 PM CDT	Severe Thunderstorm Warning	BMX	Blount	24 min
Jun 26, 3:45 PM CDT	Severe Thunderstorm Warning	BMX	Blount, Cherokee, Etowah, St. Clair	45 min
Jun 26, 4:03 PM CDT	Severe Thunderstorm Warning	BMX	Calhoun, Cherokee, Cleburne, Etowah, Jefferson, St. Clair and 2 more	42 min
Jun 26, 4:11 PM CDT	Severe Thunderstorm Warning	BMX	Barbour, Bullock, Pike	24 min
Jun 26, 4:41 PM CDT	Severe Thunderstorm Warning	BMX	Bibb, Chilton, Clay, Cleburne, Coosa, Randolph and 3 more	49 min
Jun 26, 4:59 PM CDT	Severe Thunderstorm Warning	BMX	Chambers, Lee	31 min
Jun 26, 5:28 PM CDT	Severe Thunderstorm Warning	BMX	Autauga, Chambers, Chilton, Clay, Coosa, Elmore and 2 more	47 min
Jun 26, 6:18 PM CDT	Severe Thunderstorm Warning	BMX	Lee	42 min
Jun 26, 6:28 PM CDT	Flash Flood Warning	BMX	Lee	3 hr

Discussions around it

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

The nearest sounding before it

Little Rock, AR (KLZK), launched 12:00Z, 5.1 hours before the alert went out and 147 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: 2937 J/kg
Mixed-layer CIN: -84 J/kg
Mixed-layer LCL: 803 m above ground
0-6 km bulk shear: 30 kt
0-1 km storm-relative helicity: -35 m²/s²
0-3 km storm-relative helicity: 14 m²/s²
Significant tornado parameter: -0.0
Supercell composite: -0.1

Open this sounding in Storm Lab

SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jun 26, 10:34 AM CDT	Mesoscale Discussion	SPC	Blount, Calhoun, Cherokee, Cleburne, Colbert, Cullman and 16 more	56 min
Jun 26, 2:33 PM CDT	Mesoscale Discussion	SPC	Blount, Cherokee, Colbert, Cullman, DeKalb, Etowah and 12 more	87 min
Jun 26, 5:29 PM CDT	Mesoscale Discussion	SPC	Blount, Calhoun, Cherokee, Clay, Cleburne, Colbert and 20 more	46 min
Jun 26, 2:11 PM CDT	Mesoscale Discussion	SPC	Clay, Greene, Randolph	64 min
Jun 26, 1:21 AM CDT	Mesoscale Discussion	SPC	Cheatham, Clay, Henry, Houston, Macon, Montgomery and 5 more	84 min
Jun 26, 4:14 AM CDT	Mesoscale Discussion	SPC	Anderson, Benton, Bledsoe, Campbell, Cannon, Cheatham and 32 more	91 min

Nearby

Severe Thunderstorm Watches in Alabama, 2011 Severe Thunderstorm Watches in Tennessee, 2011 Severe Thunderstorm Watches in Mississippi, 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.