Alert archive / Tennessee / Mesoscale Discussions in 2011

Mesoscale Discussion 584

April 26, 20115 counties in Alabama; 11 counties in Kentucky; 18 counties in Tennessee

The Storm Prediction Center issued this mesoscale discussion at Apr 26, 2011, 2:04 AM CDT for 5 counties in Alabama; 11 counties in Kentucky; 18 counties in Tennessee. It was in force for 56 min.

The area

The outline as issued.

The facts

Issued: Apr 26, 2011, 2:04 AM CDT (07:04 UTC)
Expired: Apr 26, 2011, 3:00 AM CDT
In force: 56 min
Issued by: the Storm Prediction Center

All 34 counties

Lawrence County, AL, Limestone County, AL, Madison County, AL, Morgan County, AL, Winston County, AL, Allen County, KY, Barren County, KY, Breckinridge County, KY, Edmonson County, KY, Grayson County, KY, Hardin County, KY, Hart County, KY, Larue County, KY, Metcalfe County, KY, Monroe County, KY, Warren County, KY, Bedford County, TN, Cannon County, TN, Clay County, TN, Coffee County, TN, DeKalb County, TN, Franklin County, TN, Giles County, TN, Jackson County, TN, Lincoln County, TN, Macon County, TN, Marshall County, TN, Moore County, TN, Rutherford County, TN, Smith County, TN, Sumner County, TN, Trousdale County, TN, Warren County, TN, Wilson County, TN

The radar

The Nashville radar (KOHX), 64 km from the middle of the area, began a volume at 07:07 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

Nashville Metro, TN (KBNA), launched 00:00Z, 7.1 hours before the alert went out and 51 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: 211 J/kg
Mixed-layer CIN: -48 J/kg
Mixed-layer LCL: 1752 m above ground
0-6 km bulk shear: 41 kt
0-1 km storm-relative helicity: 67 m²/s²
0-3 km storm-relative helicity: 147 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 1.4

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
Apr 25, 11:05 PM CDT	Mesoscale Discussion	SPC	Colbert, Franklin, Lauderdale	115 min
Apr 25, 11:42 PM CDT	Severe Thunderstorm Watch	SPC	Colbert, Franklin, Lauderdale, Lawrence, Limestone	7 hr
Apr 25, 7:34 PM CDT	Mesoscale Discussion	SPC	Ballard, Caldwell, Calloway, Carlisle, Crittenden, Fulton and 9 more	116 min
Apr 26, 12:49 PM CDT	Mesoscale Discussion	SPC	Martin	56 min
Apr 26, 2:41 PM CDT	Mesoscale Discussion	SPC	Ballard, Calloway, Carlisle, Fulton, Graves, Hickman and 2 more	94 min
Apr 26, 3:02 PM CDT	Tornado Watch PDS	SPC	Ballard, Caldwell, Calloway, Carlisle, Christian, Crittenden and 16 more	7 hr
Apr 26, 4:38 PM CDT	Mesoscale Discussion	SPC	Breckinridge, Bullitt, Hancock, Henderson, Jefferson, Meade and 2 more	37 min
Apr 26, 4:50 PM CDT	Tornado Watch	SPC	Allen, Anderson, Barren, Breckinridge, Bullitt, Butler and 25 more	5 hr
Apr 26, 6:17 PM CDT	Mesoscale Discussion	SPC	Ballard, Caldwell, Calloway, Carlisle, Christian, Crittenden and 14 more	118 min
Apr 26, 10:51 AM CDT	Mesoscale Discussion	SPC	Fayette, Haywood, Lauderdale, Shelby, Tipton	54 min

Nearby

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