Alert archive / Tennessee / Mesoscale Discussions in 2011

Mesoscale Discussion 1402

June 26, 20114 states

The Storm Prediction Center issued this mesoscale discussion at Jun 26, 2011, 2:33 PM CDT for 4 states. It was in force for 87 min.

The area

The outline as issued.

The facts

Issued: Jun 26, 2011, 2:33 PM CDT (19:33 UTC)
Expired: Jun 26, 2011, 4:00 PM CDT
In force: 87 min
Issued by: the Storm Prediction Center

All 57 counties

Blount County, AL, Cherokee County, AL, Colbert County, AL, Cullman County, AL, DeKalb County, AL, Etowah County, AL, Franklin County, AL, Jackson County, AL, Lauderdale County, AL, Lawrence County, AL, Limestone County, AL, Madison County, AL, Marion County, AL, Marshall County, AL, Morgan County, AL, St. Clair County, AL, Walker County, AL, Winston County, AL, Crittenden County, AR, Alcorn County, MS, Benton 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, Tate County, MS, Tippah County, MS, Tishomingo County, MS, Tunica County, MS, Union County, MS, Bedford County, TN, Chester County, TN, Decatur County, TN, Fayette County, TN, Franklin County, TN, Giles County, TN, Hardeman County, TN, Hardin County, TN, Haywood County, TN, Henderson County, TN, Lawrence County, TN, Lewis County, TN, Lincoln County, TN, Madison County, TN, Marshall County, TN, McNairy County, TN, Moore County, TN, Perry County, TN, Shelby County, TN, Tipton County, TN, Wayne County, TN

The radar

The Columbus AFB radar (KGWX), 74 km from the middle of the area, began a volume at 19:34 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.

The nearest sounding before it

Little Rock, AR (KLZK), launched 12:00Z, 7.6 hours before the alert went out and 149 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

The text

As transmitted, in the capitals the NWS used until 2016.

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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, 12:05 PM CDT	Severe Thunderstorm Watch	SPC	Autauga, Barbour, Bibb, Blount, Bullock, Calhoun and 38 more	8 hr
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

Mesoscale Discussions in Tennessee, 2011 Mesoscale Discussions in Alabama, 2011 Mesoscale Discussions in Mississippi, 2011 Every mesoscale discussion 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.