Alert archive / Tennessee / Severe Thunderstorm Watches in 2006

Severe Thunderstorm Watch 409

May 26, 200610 counties in Alabama; 28 counties in Tennessee

The Storm Prediction Center issued this severe thunderstorm watch at May 26, 2006, 5:57 PM CDT for 10 counties in Alabama; 28 counties in Tennessee. It was in force for 5 hr.

The area

The outline as issued.

The facts

Issued: May 26, 2006, 5:57 PM CDT (22:57 UTC)
Expired: May 26, 2006, 11:00 PM CDT
In force: 5 hr
Issued by: the Storm Prediction Center
Largest hail expected: 2 in
Strongest gust expected: 60 kt

All 38 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, Bedford County, TN, Benton County, TN, Cannon County, TN, Cheatham County, TN, Coffee County, TN, Davidson County, TN, DeKalb County, TN, Dickson County, TN, Franklin County, TN, Giles County, TN, Grundy County, TN, Hickman County, TN, Houston County, TN, Humphreys County, TN, Lawrence County, TN, Lewis County, TN, Lincoln County, TN, Marshall County, TN, Maury County, TN, Montgomery County, TN, Moore County, TN, Perry County, TN, Rutherford County, TN, Stewart County, TN, Warren County, TN, Wayne County, TN, Williamson County, TN, Wilson County, TN

The radar

The Nashville radar (KOHX), 91 km from the middle of the area, began a volume at 22:56 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: 2%
Ten or more severe wind reports: 30%
One or more gusts of 65 knots or more: 20%
Ten or more severe hail reports: 50%
One or more hailstones of 2 inches or more: 20%
Six or more combined severe hail and wind reports: 70%

Warnings issued inside it

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

Issued	Product	Office	Counties	Lasted
May 26, 6:16 PM CDT	Severe Thunderstorm Warning	OHX	Benton, Humphreys	29 min
May 26, 6:30 PM CDT	Severe Thunderstorm Warning	OHX	Dickson, Hickman, Humphreys	30 min
May 26, 6:40 PM CDT	Severe Thunderstorm Warning	OHX	Benton, Humphreys	35 min
May 26, 6:50 PM CDT	Severe Thunderstorm Warning	OHX	Bedford, Marshall, Rutherford, Williamson	25 min
May 26, 7:01 PM CDT	Severe Thunderstorm Warning	OHX	Hickman, Maury, Williamson	29 min
May 26, 7:06 PM CDT	Severe Thunderstorm Warning	OHX	Bedford, Rutherford	24 min
May 26, 7:11 PM CDT	Severe Thunderstorm Warning	OHX	Humphreys	34 min
May 26, 7:25 PM CDT	Severe Thunderstorm Warning	HUN	Jackson	50 min
May 26, 7:30 PM CDT	Severe Thunderstorm Warning	OHX	Bedford	30 min
May 26, 7:44 PM CDT	Severe Thunderstorm Warning	OHX	Hickman, Humphreys, Perry	31 min
May 26, 7:46 PM CDT	Severe Thunderstorm Warning	HUN	Franklin, Lincoln, Moore	47 min
May 26, 8:02 PM CDT	Severe Thunderstorm Warning	OHX	Bedford	28 min
May 26, 8:07 PM CDT	Severe Thunderstorm Warning	OHX	Maury	23 min
May 26, 8:14 PM CDT	Severe Thunderstorm Warning	OHX	Hickman, Perry	31 min
May 26, 8:19 PM CDT	Severe Thunderstorm Warning	OHX	Humphreys	26 min
May 26, 8:36 PM CDT	Severe Thunderstorm Warning	OHX	Giles, Marshall, Maury	39 min
May 26, 8:45 PM CDT	Severe Thunderstorm Warning	OHX	Dickson, Hickman, Humphreys	31 min
May 26, 9:14 PM CDT	Severe Thunderstorm Warning	OHX	Lewis	31 min
May 26, 9:25 PM CDT	Severe Thunderstorm Warning	OHX	Giles, Maury	35 min
May 26, 9:46 PM CDT	Severe Thunderstorm Warning	OHX	Lawrence, Lewis	29 min
May 26, 9:59 PM CDT	Severe Thunderstorm Warning	OHX	Giles	46 min
May 26, 10:42 PM CDT	Severe Thunderstorm Warning	OHX	Lawrence	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, 11.0 hours before the alert went out and 78 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: 404 J/kg
Mixed-layer CIN: -142 J/kg
Mixed-layer LCL: 967 m above ground
0-6 km bulk shear: 43 kt
0-1 km storm-relative helicity: 195 m²/s²
0-3 km storm-relative helicity: 226 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 1.5

Open this sounding in Storm Lab

SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
May 26, 12:53 AM CDT	Severe Thunderstorm Watch	SPC	Jackson, Lauderdale, Limestone, Madison	4 hr
May 26, 3:57 AM CDT	Mesoscale Discussion	SPC	Colbert, Jackson, Lauderdale, Limestone, Madison	93 min
May 26, 1:12 PM CDT	Severe Thunderstorm Watch	SPC	Bryan, Bulloch, Burke, Candler, Chatham, Columbia and 11 more	9 hr
May 26, 2:53 PM CDT	Severe Thunderstorm Watch	SPC	Elbert, Franklin, Habersham, Hart, Rabun, Stephens	7 hr
May 26, 3:39 PM CDT	Severe Thunderstorm Watch	SPC	Banks, Barrow, Bartow, Carroll, Catoosa, Chattooga and 37 more	6 hr
May 26, 6:21 PM CDT	Mesoscale Discussion	SPC	Banks, Barrow, Bartow, Bryan, Bulloch, Burke and 53 more	84 min
May 26, 1:11 AM CDT	Mesoscale Discussion	SPC	Campbell, Carter, Claiborne, Grainger, Greene, Hamblen and 8 more	94 min
May 26, 10:42 AM CDT	Mesoscale Discussion	SPC	Carter, Greene, Johnson, Sullivan, Unicoi, Washington	2 hr
May 26, 4:35 PM CDT	Severe Thunderstorm Watch	SPC	Carroll, Chester, Crockett, Decatur, Dyer, Fayette and 14 more	6 hr

Nearby

Severe Thunderstorm Watches in Tennessee, 2006 Severe Thunderstorm Watches in Alabama, 2006 Every severe thunderstorm watch in 2006

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.