Alert archive / Tennessee / Mesoscale Discussions in 2011

Mesoscale Discussion 572

April 25, 201126 counties in Tennessee

The Storm Prediction Center issued this mesoscale discussion at Apr 25, 2011, 1:48 PM CDT for 26 counties in Tennessee. It was in force for 87 min.

The area

The outline as issued.

The facts

Issued: Apr 25, 2011, 1:48 PM CDT (18:48 UTC)
Expired: Apr 25, 2011, 3:15 PM CDT
In force: 87 min
Issued by: the Storm Prediction Center

All 26 counties

Bedford County, TN, Benton County, TN, Carroll County, TN, Cheatham County, TN, Davidson County, TN, Decatur County, TN, Dickson County, TN, Giles County, TN, Hardin County, TN, Henderson County, TN, Henry County, TN, Hickman County, TN, Houston County, TN, Humphreys County, TN, Lawrence County, TN, Lewis County, TN, Marshall County, TN, Maury County, TN, Montgomery County, TN, Perry County, TN, Robertson County, TN, Rutherford County, TN, Stewart County, TN, Sumner County, TN, Wayne County, TN, Williamson County, TN

The watches that followed

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

The nearest sounding before it

Nashville Metro, TN (KBNA), launched 12:00Z, 6.8 hours before the alert went out and 90 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: 73 J/kg
Mixed-layer CIN: -150 J/kg
Mixed-layer LCL: 1101 m above ground
0-6 km bulk shear: 37 kt
0-1 km storm-relative helicity: 171 m²/s²
0-3 km storm-relative helicity: 201 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

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, 8:37 AM CDT	Mesoscale Discussion	SPC	Chester, Fayette, Hardeman, Hardin, McNairy, Shelby	53 min
Apr 25, 9:17 AM CDT	Severe Thunderstorm Watch	SPC	Carroll, Chester, Crockett, Decatur, Fayette, Gibson and 10 more	6 hr
Apr 25, 1:15 PM CDT	Mesoscale Discussion	SPC	Fayette, Hardeman, McNairy, Shelby	60 min
Apr 25, 2:29 PM CDT	Severe Thunderstorm Watch	SPC	Benton, Cheatham, Davidson, Dickson, Hickman, Houston and 14 more	4 hr
Apr 25, 4:34 PM CDT	Mesoscale Discussion	SPC	Carroll, Chester, Crockett, Dyer, Fayette, Gibson and 10 more	56 min
Apr 25, 4:50 PM CDT	Tornado Watch PDS	SPC	Carroll, Chester, Crockett, Dyer, Fayette, Gibson and 12 more	7 hr

Nearby

Mesoscale Discussions in Tennessee, 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.