Alert archive / Tennessee / Severe Thunderstorm Watches in 2011

Severe Thunderstorm Watch 347

May 23, 201129 counties in Kentucky; 35 counties in Tennessee

The Storm Prediction Center issued this severe thunderstorm watch at May 23, 2011, 4:57 PM CDT for 29 counties in Kentucky; 35 counties in Tennessee. It was in force for 4 hr.

The area

The outline as issued.

The facts

Issued: May 23, 2011, 4:57 PM CDT (21:57 UTC)
Expired: May 23, 2011, 9:20 PM CDT
In force: 4 hr
Issued by: the Storm Prediction Center
Largest hail expected: 2 in
Strongest gust expected: 60 kt

All 64 counties

Allen County, KY, Barren County, KY, Butler County, KY, Caldwell County, KY, Calloway County, KY, Christian County, KY, Crittenden County, KY, Daviess County, KY, Edmonson County, KY, Graves County, KY, Grayson County, KY, Hart County, KY, Henderson County, KY, Hopkins County, KY, Larue County, KY, Livingston County, KY, Logan County, KY, Lyon County, KY, Marshall County, KY, McCracken County, KY, McLean County, KY, Muhlenberg County, KY, Ohio County, KY, Simpson County, KY, Todd County, KY, Trigg County, KY, Union County, KY, Warren County, KY, Webster County, KY, Bedford County, TN, Benton County, TN, Carroll County, TN, Cheatham County, TN, Chester County, TN, Davidson County, TN, Decatur County, TN, Dickson County, TN, Gibson County, TN, Giles County, TN, Hardeman 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, Macon County, TN, Madison County, TN, Marshall County, TN, Maury County, TN, McNairy County, TN, Montgomery County, TN, Perry County, TN, Robertson County, TN, Rutherford County, TN, Stewart County, TN, Sumner County, TN, Trousdale County, TN, Wayne County, TN, Weakley County, TN, Williamson County, TN, Wilson County, TN

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: 60%
One or more gusts of 65 knots or more: 30%
Ten or more severe hail reports: 30%
One or more hailstones of 2 inches or more: 20%
Six or more combined severe hail and wind reports: 90%

Warnings issued inside it

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

Issued	Product	Office	Counties	Lasted
May 23, 4:58 PM CDT	Severe Thunderstorm Warning	PAH	Daviess, Henderson	47 min
May 23, 4:58 PM CDT	Severe Thunderstorm Warning	MEG	Crockett, Dyer, Gibson, Haywood, Lauderdale	47 min
May 23, 5:25 PM CDT	Severe Thunderstorm Warning	MEG	Carroll, Crockett, Gibson, Weakley	50 min
May 23, 5:35 PM CDT	Severe Thunderstorm Warning	MEG	Fayette, Hardeman, Haywood	40 min
May 23, 5:38 PM CDT	Severe Thunderstorm Warning	MEG	Carroll, Crockett, Fayette, Gibson, Hardeman, Haywood and 1 more	52 min
May 23, 5:55 PM CDT	Severe Thunderstorm Warning	MEG	Carroll, Gibson, Henry, Obion, Weakley	50 min
May 23, 5:56 PM CDT	Severe Thunderstorm Warning	PAH	Calloway, Graves, Livingston, Lyon, McCracken, Marshall	24 min
May 23, 6:11 PM CDT	Severe Thunderstorm Warning	MEG	Chester, Fayette, Hardeman, Madison	49 min
May 23, 6:13 PM CDT	Severe Thunderstorm Warning	MEG	Carroll, Chester, Henderson, Madison	47 min
May 23, 6:37 PM CDT	Severe Thunderstorm Warning	OHX	Montgomery, Stewart	23 min
May 23, 6:50 PM CDT	Tornado Warning	OHX	Montgomery, Stewart	25 min
May 23, 6:54 PM CDT	Severe Thunderstorm Warning	PAH	Christian, Todd, Trigg	36 min
May 23, 6:59 PM CDT	Tornado Warning	PAH	Christian, Todd, Trigg	31 min
May 23, 7:14 PM CDT	Severe Thunderstorm Warning	OHX	Benton, Hickman, Humphreys, Perry	31 min
May 23, 7:19 PM CDT	Severe Thunderstorm Warning	PAH	Christian, Muhlenberg, Todd	41 min
May 23, 7:29 PM CDT	Severe Thunderstorm Warning	LMK	Logan	31 min
May 23, 7:39 PM CDT	Severe Thunderstorm Warning	MEG	Decatur, Henderson	21 min
May 23, 7:50 PM CDT	Severe Thunderstorm Warning	OHX	Hickman, Perry, Wayne	25 min
May 23, 7:57 PM CDT	Severe Thunderstorm Warning	OHX	Dickson, Hickman, Humphreys	33 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

Nashville Metro, TN (KBNA), launched 12:00Z, 10.0 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: 11 J/kg
Mixed-layer CIN: -260 J/kg
Mixed-layer LCL: 946 m above ground
0-6 km bulk shear: 61 kt
0-1 km storm-relative helicity: -255 m²/s²
0-3 km storm-relative helicity: -136 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
May 22, 7:52 PM CDT	Mesoscale Discussion	SPC	Bond, Calhoun, Clinton, Greene, Jersey, Macoupin and 6 more	53 min
May 22, 8:26 PM CDT	Tornado Watch	SPC	Bond, Calhoun, Cass, Champaign, Christian, Clay and 35 more	8 hr
May 22, 9:35 PM CDT	Mesoscale Discussion	SPC	DeKalb, DuPage, Grundy, Iroquois, Kane, Kankakee and 6 more	55 min
May 22, 10:24 PM CDT	Mesoscale Discussion	SPC	Clark, Clay, Coles, Crawford, Cumberland, Edgar and 9 more	66 min
May 23, 7:25 AM CDT	Mesoscale Discussion	SPC	Edgar, Vermilion	65 min
May 23, 10:55 AM CDT	Severe Thunderstorm Watch	SPC	Alexander, Bond, Calhoun, Clinton, Edwards, Fayette and 27 more	7 hr
May 23, 12:37 PM CDT	Mesoscale Discussion	SPC	Bond, Christian, Clark, Clay, Clinton, Coles and 34 more	83 min
May 23, 12:54 PM CDT	Severe Thunderstorm Watch	SPC	Champaign, Christian, Clark, Clay, Coles, Crawford and 13 more	5 hr
May 23, 2:52 PM CDT	Mesoscale Discussion	SPC	Clark, Clay, Coles, Crawford, Cumberland, Edgar and 8 more	53 min
May 23, 3:58 PM CDT	Mesoscale Discussion	SPC	Alexander, Edwards, Franklin, Gallatin, Hamilton, Hardin and 14 more	92 min
May 23, 4:24 PM CDT	Mesoscale Discussion	SPC	Massac	96 min
May 23, 3:20 AM CDT	Mesoscale Discussion	SPC	Adair, Allen, Anderson, Barren, Bath, Bell and 76 more	85 min
May 23, 3:28 PM CDT	Severe Thunderstorm Watch	SPC	Anderson, Boone, Bourbon, Bracken, Breckinridge, Bullitt and 30 more	6 hr
May 23, 5:20 PM CDT	Mesoscale Discussion	SPC	Anderson, Boone, Bourbon, Bracken, Breckinridge, Bullitt and 27 more	55 min
May 23, 6:20 PM CDT	Mesoscale Discussion	SPC	Bath, Boyd, Breathitt, Carter, Elliott, Estill and 19 more	85 min
May 22, 11:46 PM CDT	Mesoscale Discussion	SPC	Dyer, Lake	89 min
May 23, 1:16 PM CDT	Mesoscale Discussion	SPC	Lake	89 min
May 23, 1:34 PM CDT	Severe Thunderstorm Watch	SPC	Crockett, Dyer, Fayette, Haywood, Lake, Lauderdale and 3 more	6 hr

Nearby

Severe Thunderstorm Watches in Tennessee, 2011 Severe Thunderstorm Watches in Kentucky, 2011 Every severe thunderstorm watch 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.