Alert archive / Tennessee / Severe Thunderstorm Watches in 2012

Severe Thunderstorm Watch 373

June 11, 20124 states

The Storm Prediction Center issued this severe thunderstorm watch at Jun 11, 2012, 1:28 PM CDT for 4 states. It was in force for 7 hr.

The area

The outline as issued.

The facts

Issued: Jun 11, 2012, 1:28 PM CDT (18:28 UTC)
Expired: Jun 11, 2012, 8:20 PM CDT
In force: 7 hr
Issued by: the Storm Prediction Center
Largest hail expected: 2 in
Strongest gust expected: 65 kt

All 95 counties

Colbert County, AL, Cullman County, AL, Franklin County, AL, Lauderdale County, AL, Lawrence County, AL, Arkansas County, AR, Cleveland County, AR, Crittenden County, AR, Cross County, AR, Dallas County, AR, Faulkner County, AR, Garland County, AR, Grant County, AR, Hot Spring County, AR, Jefferson County, AR, Lee County, AR, Lincoln County, AR, Lonoke County, AR, Mississippi County, AR, Monroe County, AR, Perry County, AR, Phillips County, AR, Poinsett County, AR, Prairie County, AR, Pulaski County, AR, Saline County, AR, St. Francis County, AR, White County, AR, Woodruff County, AR, Yell County, AR, Alcorn County, MS, Benton County, MS, Calhoun County, MS, Chickasaw County, MS, Coahoma 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, Benton County, TN, Carroll County, TN, Cheatham County, TN, Chester County, TN, Crockett County, TN, Davidson County, TN, Decatur County, TN, Dickson County, TN, Dyer County, TN, Fayette County, TN, Gibson County, TN, Giles County, TN, Hardeman County, TN, Hardin County, TN, Haywood County, TN, Henderson County, TN, Henry County, TN, Hickman County, TN, Houston County, TN, Humphreys County, TN, Lauderdale County, TN, Lawrence County, TN, Lewis County, TN, Macon County, TN, Madison County, TN, Marshall County, TN, Maury County, TN, McNairy County, TN, Montgomery County, TN, Obion County, TN, Perry County, TN, Robertson County, TN, Rutherford County, TN, Shelby County, TN, Stewart County, TN, Sumner County, TN, Tipton County, TN, Trousdale County, TN, Wayne County, TN, Weakley County, TN, Williamson County, TN, Wilson County, TN

The radar

The Memphis radar (KNQA), 84 km from the middle of the area, began a volume at 18:28 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: 90%
One or more gusts of 65 knots or more: 50%
Ten or more severe hail reports: 50%
One or more hailstones of 2 inches or more: 20%
Six or more combined severe hail and wind reports: 95%

Warnings issued inside it

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

Issued	Product	Office	Counties	Lasted
Jun 11, 1:37 PM CDT	Severe Thunderstorm Warning	MEG	Clay, Craighead, Greene, Mississippi	53 min
Jun 11, 2:00 PM CDT	Severe Thunderstorm Warning	MEG	Craighead, Greene, Poinsett	45 min
Jun 11, 2:12 PM CDT	Severe Thunderstorm Warning	MEG	Craighead, Mississippi	48 min
Jun 11, 2:16 PM CDT	Severe Thunderstorm Warning	MEG	Dyer, Lake, Obion	44 min
Jun 11, 2:25 PM CDT	Severe Thunderstorm Warning	LZK	Cleburne, Faulkner, Van Buren, White	50 min
Jun 11, 2:25 PM CDT	Severe Thunderstorm Warning	MEG	Craighead, Crittenden, Cross, Mississippi, Poinsett	35 min
Jun 11, 2:38 PM CDT	Severe Thunderstorm Warning	MEG	Mississippi	52 min
Jun 11, 2:44 PM CDT	Severe Thunderstorm Warning	MEG	Crockett, Dyer, Gibson, Haywood, Lake, Lauderdale and 2 more	46 min
Jun 11, 2:54 PM CDT	Severe Thunderstorm Warning	LZK	Faulkner, Lonoke, Prairie, White, Woodruff	51 min
Jun 11, 2:54 PM CDT	Severe Thunderstorm Warning	MEG	Crittenden, Mississippi, Poinsett	36 min
Jun 11, 3:03 PM CDT	Severe Thunderstorm Warning	LZK	Cleburne, Independence, Jackson, White, Woodruff	57 min
Jun 11, 3:10 PM CDT	Severe Thunderstorm Warning	MEG	Carroll, Crockett, Gibson, Haywood, Henry, Madison and 2 more	50 min
Jun 11, 3:20 PM CDT	Severe Thunderstorm Warning	LZK	Faulkner, Lonoke, Pulaski	40 min
Jun 11, 3:25 PM CDT	Severe Thunderstorm Warning	MEG	Crittenden	50 min
Jun 11, 3:37 PM CDT	Severe Thunderstorm Warning	LZK	Lonoke, Monroe, Prairie, White, Woodruff	68 min
Jun 11, 3:42 PM CDT	Severe Thunderstorm Warning	MEG	Carroll, Chester, Decatur, Henderson, Henry, Madison	48 min
Jun 11, 3:49 PM CDT	Severe Thunderstorm Warning	OHX	Benton, Houston, Humphreys, Stewart	41 min
Jun 11, 3:55 PM CDT	Severe Thunderstorm Warning	LZK	Conway, Faulkner, Perry, Pulaski	50 min
Jun 11, 3:55 PM CDT	Severe Thunderstorm Warning	MEG	Alcorn, Tippah, Tishomingo	65 min
Jun 11, 3:57 PM CDT	Severe Thunderstorm Warning	MEG	Alcorn, Benton, DeSoto, Lafayette, Marshall, Panola and 3 more	48 min
Jun 11, 4:03 PM CDT	Severe Thunderstorm Warning	MEG	Lee, Phillips, St. Francis	42 min
Jun 11, 4:21 PM CDT	Severe Thunderstorm Warning	LZK	Arkansas, Lonoke, Monroe, Prairie	54 min
Jun 11, 4:26 PM CDT	Severe Thunderstorm Warning	MEG	Carroll, Decatur, Henderson	34 min
Jun 11, 4:28 PM CDT	Severe Thunderstorm Warning	OHX	Benton, Humphreys, Perry, Wayne	47 min
Jun 11, 4:35 PM CDT	Severe Thunderstorm Warning	MEG	Alcorn, Benton, Lafayette, Lee, Marshall, Pontotoc and 4 more	40 min
Jun 11, 4:36 PM CDT	Severe Thunderstorm Warning	OHX	Montgomery, Stewart	39 min
Jun 11, 4:45 PM CDT	Severe Thunderstorm Warning	MEG	Lee, Phillips	45 min
Jun 11, 4:49 PM CDT	Flash Flood Warning	MEG	Lee, Phillips	116 min
Jun 11, 4:53 PM CDT	Flash Flood Warning	MEG	Benton, DeSoto, Marshall	87 min
Jun 11, 4:56 PM CDT	Flash Flood Warning	MEG	Alcorn, Benton, Itawamba, Lee, Pontotoc, Prentiss and 3 more	2 hr
Jun 11, 4:56 PM CDT	Severe Thunderstorm Warning	MEG	Alcorn, Tishomingo	49 min
Jun 11, 5:03 PM CDT	Severe Thunderstorm Warning	LZK	Arkansas, Desha, Jefferson, Lincoln	57 min
Jun 11, 5:05 PM CDT	Severe Thunderstorm Warning	OHX	Houston, Montgomery, Stewart	40 min
Jun 11, 5:08 PM CDT	Severe Thunderstorm Warning	MEG	Phillips	52 min
Jun 11, 5:12 PM CDT	Severe Thunderstorm Warning	MEG	Alcorn, Itawamba, Lee, Pontotoc, Prentiss, Tishomingo and 1 more	48 min
Jun 11, 5:15 PM CDT	Severe Thunderstorm Warning	OHX	Cheatham, Montgomery, Robertson	30 min
Jun 11, 5:22 PM CDT	Severe Thunderstorm Warning	HUN	Colbert, Franklin	38 min
Jun 11, 5:33 PM CDT	Tornado Warning	MEG	Itawamba, Tishomingo	12 min
Jun 11, 5:38 PM CDT	Severe Thunderstorm Warning	LZK	Desha, Jefferson, Lincoln	52 min
Jun 11, 5:40 PM CDT	Flash Flood Warning	MEG	Coahoma, Panola, Quitman, Tallahatchie, Tunica, Yalobusha	3 hr
Jun 11, 5:41 PM CDT	Severe Thunderstorm Warning	MEG	Chickasaw, Itawamba, Lee, Monroe	64 min
Jun 11, 5:43 PM CDT	Severe Thunderstorm Warning	MEG	Coahoma, Quitman, Tallahatchie	47 min
Jun 11, 5:53 PM CDT	Severe Thunderstorm Warning	HUN	Franklin, Lawrence	37 min
Jun 11, 5:56 PM CDT	Severe Thunderstorm Warning	LZK	Desha, Drew, Lincoln	49 min
Jun 11, 6:01 PM CDT	Severe Thunderstorm Warning	OHX	Robertson	38 min
Jun 11, 6:10 PM CDT	Severe Thunderstorm Warning	LZK	Bradley, Calhoun, Cleveland, Dallas, Drew, Lincoln	65 min
Jun 11, 6:12 PM CDT	Severe Thunderstorm Warning	OHX	Robertson, Sumner	33 min
Jun 11, 6:22 PM CDT	Severe Thunderstorm Warning	OHX	Davidson, Robertson, Sumner, Wilson	23 min
Jun 11, 6:26 PM CDT	Severe Thunderstorm Warning	HUN	Franklin, Lawrence	35 min
Jun 11, 6:43 PM CDT	Severe Thunderstorm Warning	LZK	Bradley, Desha, Drew, Lincoln	47 min
Jun 11, 7:12 PM CDT	Severe Thunderstorm Warning	HUN	Cullman	48 min
Jun 11, 7:38 PM CDT	Severe Thunderstorm Warning	HUN	Cullman	37 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

Little Rock, AR (KLZK), launched 12:00Z, 6.5 hours before the alert went out and 79 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: 2451 J/kg
Mixed-layer CIN: -37 J/kg
Mixed-layer LCL: 786 m above ground
0-6 km bulk shear: 25 kt
0-1 km storm-relative helicity: 86 m²/s²
0-3 km storm-relative helicity: 120 m²/s²
Significant tornado parameter: 0.7
Supercell composite: 4.9

Open this sounding in Storm Lab

SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jun 11, 12:22 PM CDT	Mesoscale Discussion	SPC	Geneva, Henry, Houston	53 min
Jun 11, 1:12 PM CDT	Mesoscale Discussion	SPC	Colbert, Franklin, Lauderdale, Limestone	93 min
Jun 11, 3:29 PM CDT	Mesoscale Discussion	SPC	Colbert, Franklin, Lauderdale	2 hr
Jun 11, 5:05 PM CDT	Mesoscale Discussion	SPC	Colbert, Franklin, Lauderdale, Lawrence	55 min
Jun 11, 5:17 PM CDT	Severe Thunderstorm Watch	SPC	Autauga, Bibb, Blount, Calhoun, Chambers, Chilton and 28 more	6 hr
Jun 11, 9:31 AM CDT	Mesoscale Discussion	SPC	Baxter, Benton, Boone, Carroll, Clay, Cleburne and 16 more	59 min
Jun 11, 9:45 AM CDT	Severe Thunderstorm Watch	SPC	Baxter, Benton, Boone, Carroll, Clay, Cleburne and 23 more	6 hr
Jun 11, 3:59 PM CDT	Mesoscale Discussion	SPC	Crawford, Polk, Scott, Sebastian, Washington	91 min

Nearby

Severe Thunderstorm Watches in Tennessee, 2012 Severe Thunderstorm Watches in Arkansas, 2012 Severe Thunderstorm Watches in Mississippi, 2012 Every severe thunderstorm watch in 2012

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.