Alert archive / Tennessee / Mesoscale Discussions in 2011

Mesoscale Discussion 1427

June 28, 20114 states

The Storm Prediction Center issued this mesoscale discussion at Jun 28, 2011, 6:08 AM CDT for 4 states. It was in force for 97 min.

The area

The outline as issued.

The facts

Issued: Jun 28, 2011, 6:08 AM CDT (11:08 UTC)
Expired: Jun 28, 2011, 7:45 AM CDT
In force: 97 min
Issued by: the Storm Prediction Center

All 36 counties

Colbert County, AL, DeKalb County, AL, Franklin County, AL, Jackson County, AL, Lauderdale County, AL, Lawrence County, AL, Limestone County, AL, Madison County, AL, Marshall County, AL, Morgan County, AL, Catoosa County, GA, Chattooga County, GA, Dade County, GA, Gordon County, GA, Murray County, GA, Walker County, GA, Whitfield County, GA, Alcorn County, MS, Prentiss County, MS, Tippah County, MS, Tishomingo County, MS, Bedford County, TN, Coffee County, TN, Franklin County, TN, Giles County, TN, Grundy County, TN, Hamilton County, TN, Hardin County, TN, Lawrence County, TN, Lewis County, TN, Lincoln County, TN, Marion County, TN, Marshall County, TN, McNairy County, TN, Moore County, TN, Wayne County, TN

The watches that followed

Watches SPC issued over any of the same counties within four hours of this discussion.

Severe Thunderstorm Watch 569Jun 28, 7:05 AM CDT

The nearest sounding before it

Nashville Metro, TN (KBNA), launched 00:00Z, 11.1 hours before the alert went out and 133 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: 2905 J/kg
Mixed-layer CIN: -9 J/kg
Mixed-layer LCL: 1124 m above ground
0-6 km bulk shear: 43 kt
0-1 km storm-relative helicity: 97 m²/s²
0-3 km storm-relative helicity: 197 m²/s²
Significant tornado parameter: 1.4
Supercell composite: 7.6

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 28, 4:17 AM CDT	Severe Thunderstorm Watch	SPC	Colbert, Franklin, Jackson, Lauderdale, Lawrence, Limestone and 1 more	8 hr
Jun 28, 9:52 AM CDT	Mesoscale Discussion	SPC	Bibb, Choctaw, Fayette, Greene, Hale, Lamar and 5 more	113 min
Jun 28, 10:26 AM CDT	Severe Thunderstorm Watch	SPC	Autauga, Baldwin, Bibb, Butler, Chilton, Choctaw and 26 more	8 hr
Jun 28, 12:53 PM CDT	Mesoscale Discussion	SPC	Barbour, Dale, Henry, Houston, Russell	97 min
Jun 28, 3:19 PM CDT	Mesoscale Discussion	SPC	Butler, Choctaw, Clarke, Conecuh, Covington, Crenshaw and 6 more	116 min
Jun 28, 4:08 AM CDT	Mesoscale Discussion	SPC	Alcorn, Benton, DeSoto, Marshall, Tippah	82 min
Jun 28, 6:34 AM CDT	Mesoscale Discussion	SPC	Benton, Coahoma, DeSoto, Lafayette, Marshall, Panola and 4 more	86 min
Jun 28, 7:06 AM CDT	Severe Thunderstorm Watch	SPC	Alcorn, Benton, Bolivar, Calhoun, Chickasaw, Coahoma and 20 more	5 hr
Jun 28, 1:44 PM CDT	Mesoscale Discussion	SPC	Carter, Cocke, Greene, Johnson, Sullivan, Unicoi and 1 more	91 min

Nearby

Mesoscale Discussions in Tennessee, 2011 Mesoscale Discussions in Alabama, 2011 Mesoscale Discussions in Georgia, 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.