Alert archive / Tennessee / Severe Thunderstorm Watches in 2011

Severe Thunderstorm Watch 352

May 24, 201144 counties in Kentucky; 46 counties in Tennessee; 7 counties in Virginia

The Storm Prediction Center issued this severe thunderstorm watch at May 24, 2011, 6:01 AM CDT for 44 counties in Kentucky; 46 counties in Tennessee; 7 counties in Virginia. It was in force for 8 hr.

The area

The outline as issued.

The facts

Issued: May 24, 2011, 6:01 AM CDT (11:01 UTC)
Expired: May 24, 2011, 1:51 PM CDT
In force: 8 hr
Issued by: the Storm Prediction Center
Largest hail expected: 2 in
Strongest gust expected: 60 kt

All 97 counties

Adair County, KY, Allen County, KY, Barren County, KY, Bell County, KY, Breathitt County, KY, Casey County, KY, Clay County, KY, Clinton County, KY, Cumberland County, KY, Elliott County, KY, Estill County, KY, Floyd County, KY, Garrard County, KY, Green County, KY, Harlan County, KY, Hart County, KY, Jackson County, KY, Johnson County, KY, Knott County, KY, Knox County, KY, Laurel County, KY, Lee County, KY, Leslie County, KY, Letcher County, KY, Lincoln County, KY, Madison County, KY, Magoffin County, KY, Martin County, KY, McCreary County, KY, Menifee County, KY, Metcalfe County, KY, Monroe County, KY, Morgan County, KY, Owsley County, KY, Perry County, KY, Pike County, KY, Powell County, KY, Pulaski County, KY, Rockcastle County, KY, Russell County, KY, Taylor County, KY, Wayne County, KY, Whitley County, KY, Wolfe County, KY, Anderson County, TN, Bledsoe County, TN, Blount County, TN, Campbell County, TN, Cannon County, TN, Carter County, TN, Claiborne County, TN, Clay County, TN, Cocke County, TN, Coffee County, TN, Cumberland County, TN, DeKalb County, TN, Fentress County, TN, Grainger County, TN, Greene County, TN, Grundy County, TN, Hamblen County, TN, Hancock County, TN, Hawkins County, TN, Jackson County, TN, Jefferson County, TN, Johnson County, TN, Knox County, TN, Loudon County, TN, Macon County, TN, McMinn County, TN, Meigs County, TN, Monroe County, TN, Morgan County, TN, Overton County, TN, Pickett County, TN, Putnam County, TN, Rhea County, TN, Roane County, TN, Scott County, TN, Sequatchie County, TN, Sevier County, TN, Smith County, TN, Sullivan County, TN, Trousdale County, TN, Unicoi County, TN, Union County, TN, Van Buren County, TN, Warren County, TN, Washington County, TN, White County, TN, City of Bristol, VA, City of Norton, VA, Lee County, VA, Russell County, VA, Scott County, VA, Washington County, VA, Wise County, VA

The radar

The Knoxville radar (KMRX), 146 km from the middle of the area, began a volume at 11:05 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.

What SPC expected

The probabilities SPC published with the watch, for the watch area over its life.

Two or more tornadoes: 10%
One or more EF2 to EF5 tornadoes: 5%
Ten or more severe wind reports: 40%
One or more gusts of 65 knots or more: 30%
Ten or more severe hail reports: 40%
One or more hailstones of 2 inches or more: 20%
Six or more combined severe hail and wind reports: 80%

Warnings issued inside it

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

Issued	Product	Office	Counties	Lasted
May 24, 6:12 AM CDT	Severe Thunderstorm Warning	MRX	Cocke, Greene, Hamblen, Jefferson, Sevier	48 min
May 24, 6:26 AM CDT	Severe Thunderstorm Warning	LMK	Clinton, Cumberland	34 min
May 24, 6:45 AM CDT	Severe Thunderstorm Warning	JKL	McCreary, Pulaski, Wayne	45 min
May 24, 7:16 AM CDT	Severe Thunderstorm Warning	JKL	Knox, Laurel, McCreary, Pulaski, Wayne, Whitley	44 min
May 24, 9:00 AM CDT	Severe Thunderstorm Warning	MRX	Lee, Scott, Wise, City of Norton	45 min
May 24, 9:33 AM CDT	Severe Thunderstorm Warning	MRX	Hawkins, Sullivan	57 min
May 24, 10:29 AM CDT	Severe Thunderstorm Warning	MRX	Carter, Johnson, Sullivan	32 min
May 24, 12:34 PM CDT	Severe Thunderstorm Warning	JKL	Bell, Clay, Harlan, Knox, Leslie	41 min
May 24, 12:40 PM CDT	Severe Thunderstorm Warning	OHX	Macon, Smith, Sumner, Trousdale	35 min
May 24, 12:45 PM CDT	Severe Thunderstorm Warning	OHX	Macon, Smith, Trousdale	30 min
May 24, 1:07 PM CDT	Tornado Warning	OHX	Jackson, Macon, Smith, Trousdale	23 min
May 24, 1:23 PM CDT	Severe Thunderstorm Warning	OHX	Macon, Sumner	26 min
May 24, 1:28 PM CDT	Severe Thunderstorm Warning	LMK	Clinton, Cumberland, Metcalfe, Monroe, Russell	47 min
May 24, 1:31 PM CDT	Severe Thunderstorm Warning	OHX	Clay, Jackson, Macon, Smith	29 min
May 24, 1:40 PM CDT	Severe Thunderstorm Warning	MRX	Hawkins, Sullivan, Washington	28 min
May 24, 1:43 PM CDT	Severe Thunderstorm Warning	MRX	Hawkins, Sullivan	17 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 00:00Z, 11.0 hours before the alert went out and 187 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: 1402 J/kg
Mixed-layer CIN: -74 J/kg
Mixed-layer LCL: 1214 m above ground
0-6 km bulk shear: 56 kt
0-1 km storm-relative helicity: 181 m²/s²
0-3 km storm-relative helicity: 213 m²/s²
Significant tornado parameter: 1.1
Supercell composite: 7.3

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
May 23, 7:31 PM CDT	Severe Thunderstorm Watch	SPC	Bath, Boyd, Carter, Elliott, Fleming, Greenup and 6 more	3 hr
May 23, 7:47 PM CDT	Mesoscale Discussion	SPC	Adair, Allen, Barren, Butler, Caldwell, Christian and 21 more	58 min
May 24, 5:24 AM CDT	Mesoscale Discussion	SPC	Adair, Allen, Barren, Bell, Casey, Clay and 18 more	96 min
May 24, 7:34 AM CDT	Mesoscale Discussion	SPC	Bell, Breathitt, Clay, Floyd, Harlan, Jackson and 13 more	116 min
May 24, 11:55 AM CDT	Mesoscale Discussion	SPC	Adair, Allen, Barren, Bell, Clay, Clinton and 15 more	65 min
May 24, 12:57 PM CDT	Severe Thunderstorm Watch	SPC	Adair, Allen, Barren, Bell, Clay, Clinton and 14 more	6 hr
May 24, 2:33 PM CDT	Mesoscale Discussion	SPC	Harlan	87 min
May 24, 3:27 PM CDT	Mesoscale Discussion	SPC	Bell, Harlan, Letcher, Whitley	63 min
May 24, 6:46 PM CDT	Mesoscale Discussion	SPC	Anderson, Bledsoe, Blount, Campbell, Carter, Claiborne and 26 more	59 min
May 24, 9:00 AM CDT	Severe Thunderstorm Watch	SPC	Alleghany, Amherst, Appomattox, Bath, Bedford, Bland and 31 more	7 hr
May 24, 11:15 AM CDT	Mesoscale Discussion	SPC	Amelia, Amherst, Appomattox, Bedford, Botetourt, Brunswick and 41 more	90 min
May 24, 11:42 AM CDT	Severe Thunderstorm Watch	SPC	Accomack, Albemarle, Amelia, Augusta, Brunswick, Caroline and 66 more	5 hr
May 24, 3:43 PM CDT	Tornado Watch	SPC	Bland, Carroll, Floyd, Franklin, Giles, Grayson and 13 more	5 hr
May 24, 6:33 PM CDT	Mesoscale Discussion	SPC	Bland, Carroll, Charlotte, Floyd, Franklin, Grayson and 13 more	57 min
May 23, 7:07 PM CDT	Mesoscale Discussion	SPC	Brooke, Hancock	83 min

Nearby

Severe Thunderstorm Watches in Tennessee, 2011 Severe Thunderstorm Watches in Kentucky, 2011 Severe Thunderstorm Watches in Virginia, 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; radar from the NEXRAD Level II archive.