Alert archive / Tennessee / Tornado Watches in 2010

Tornado Watch 131

May 2, 20107 counties in Alabama; 33 counties in Mississippi; 52 counties in Tennessee

The Storm Prediction Center issued this tornado watch at May 2, 2010, 3:36 AM CDT for 7 counties in Alabama; 33 counties in Mississippi; 52 counties in Tennessee. It was in force for 8 hr.

The area

The outline as issued.

The facts

Issued: May 2, 2010, 3:36 AM CDT (08:36 UTC)
Expired: May 2, 2010, 12:00 PM CDT
In force: 8 hr
Issued by: the Storm Prediction Center
Particularly dangerous situation: Yes
Largest hail expected: 2 in
Strongest gust expected: 60 kt

All 92 counties

Colbert County, AL, Franklin County, AL, Lamar County, AL, Lauderdale County, AL, Lawrence County, AL, Limestone County, AL, Marion County, AL, Alcorn County, MS, Benton County, MS, Bolivar County, MS, Calhoun County, MS, Carroll County, MS, Chickasaw County, MS, Choctaw County, MS, Clay County, MS, Coahoma County, MS, DeSoto County, MS, Grenada County, MS, Itawamba County, MS, Lafayette County, MS, Lee County, MS, Leflore County, MS, Lowndes County, MS, Marshall County, MS, Monroe County, MS, Montgomery County, MS, Oktibbeha County, MS, Panola County, MS, Pontotoc County, MS, Prentiss County, MS, Quitman County, MS, Sunflower County, MS, Tallahatchie County, MS, Tate County, MS, Tippah County, MS, Tishomingo County, MS, Tunica County, MS, Union County, MS, Webster County, MS, Yalobusha County, MS, Bedford County, TN, Benton County, TN, Cannon County, TN, Carroll County, TN, Cheatham County, TN, Chester County, TN, Clay County, TN, Coffee County, TN, Crockett County, TN, Cumberland County, TN, Davidson County, TN, Decatur County, TN, DeKalb County, TN, Dickson County, TN, Fayette County, TN, Fentress County, TN, Gibson County, TN, Giles County, TN, Hardeman County, TN, Hardin County, TN, Haywood County, TN, Henderson County, TN, Henry County, TN, Hickman County, TN, Houston County, TN, Humphreys County, TN, Jackson County, TN, Lawrence County, TN, Lewis County, TN, Lincoln County, TN, Macon County, TN, Madison County, TN, Marshall County, TN, Maury County, TN, McNairy County, TN, Montgomery County, TN, Moore County, TN, Overton County, TN, Perry County, TN, Pickett County, TN, Putnam County, TN, Robertson County, TN, Rutherford County, TN, Smith County, TN, Stewart County, TN, Sumner County, TN, Trousdale County, TN, Wayne County, TN, Weakley County, TN, White County, TN, Williamson County, TN, Wilson County, TN

The radar

The Memphis radar (KNQA), 139 km from the middle of the area, began a volume at 08:36 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: 80%
One or more EF2 to EF5 tornadoes: 70%
Ten or more severe wind reports: 60%
One or more gusts of 65 knots or more: 40%
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: 95%

Warnings issued inside it

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

Issued	Product	Office	Counties	Lasted
May 2, 3:55 AM CDT	Severe Thunderstorm Warning	MEG	DeSoto, Marshall	32 min
May 2, 3:59 AM CDT	Flash Flood Warning	MEG	Carroll, Chester, Decatur, Hardeman, Hardin, Henderson and 2 more	10 hr
May 2, 4:01 AM CDT	Tornado Warning	MEG	Decatur, Hardin, Henderson	44 min
May 2, 4:06 AM CDT	Flash Flood Warning	MEG	DeSoto, Lafayette, Marshall, Panola, Quitman, Tallahatchie and 2 more	6 hr
May 2, 4:28 AM CDT	Tornado Warning	OHX	Benton, Humphreys, Perry	32 min
May 2, 4:46 AM CDT	Severe Thunderstorm Warning	MEG	Coahoma, Panola, Quitman, Tallahatchie	44 min
May 2, 4:46 AM CDT	Tornado Warning	OHX	Hickman, Humphreys, Perry	29 min
May 2, 5:06 AM CDT	Tornado Warning	OHX	Dickson, Hickman	24 min
May 2, 5:15 AM CDT	Severe Thunderstorm Warning	MEG	Lafayette, Marshall, Panola, Quitman, Tate	45 min
May 2, 5:26 AM CDT	Flash Flood Warning	MEG	Alcorn, Itawamba, Lee, Pontotoc, Prentiss, Tippah and 2 more	12 hr
May 2, 5:31 AM CDT	Tornado Warning	OHX	Cheatham, Davidson, Dickson, Williamson	29 min
May 2, 5:41 AM CDT	Flash Flood Warning	MEG	Carroll, Gibson, Henderson, Henry, Weakley	74 min
May 2, 5:53 AM CDT	Severe Thunderstorm Warning	OHX	Cheatham, Davidson, Williamson	37 min
May 2, 5:57 AM CDT	Severe Thunderstorm Warning	OHX	Cheatham, Davidson, Dickson, Montgomery, Robertson, Sumner	42 min
May 2, 6:12 AM CDT	Severe Thunderstorm Warning	OHX	Davidson, Rutherford, Sumner, Wilson	48 min
May 2, 6:31 AM CDT	Severe Thunderstorm Warning	OHX	Dickson, Hickman, Maury, Williamson	29 min
May 2, 6:59 AM CDT	Severe Thunderstorm Warning	OHX	Cheatham, Davidson, Williamson	31 min
May 2, 7:16 AM CDT	Flash Flood Warning	MEG	Benton, Calhoun, Lafayette, Marshall, Pontotoc, Tallahatchie and 3 more	6 hr
May 2, 7:34 AM CDT	Severe Thunderstorm Warning	JAN	Grenada, Montgomery, Webster	28 min
May 2, 7:36 AM CDT	Severe Thunderstorm Warning	OHX	Davidson, Sumner, Trousdale, Wilson	24 min
May 2, 7:48 AM CDT	Flash Flood Warning	JAN	Carroll, Grenada, Montgomery	117 min
May 2, 7:49 AM CDT	Severe Thunderstorm Warning	OHX	Davidson, Rutherford, Williamson	26 min
May 2, 8:13 AM CDT	Severe Thunderstorm Warning	OHX	Clay, Jackson, Macon, Smith, Sumner, Trousdale and 1 more	32 min
May 2, 8:30 AM CDT	Severe Thunderstorm Warning	JAN	Carroll, Grenada, Leflore, Sunflower	60 min
May 2, 8:34 AM CDT	Tornado Warning	JAN	Carroll, Grenada, Leflore	34 min
May 2, 8:49 AM CDT	Severe Thunderstorm Warning	OHX	Clay, Jackson, Macon, Smith, Trousdale	41 min
May 2, 8:54 AM CDT	Severe Thunderstorm Warning	MEG	Panola, Quitman, Tallahatchie, Yalobusha	51 min
May 2, 8:58 AM CDT	Severe Thunderstorm Warning	OHX	Davidson, Rutherford, Smith, Sumner, Trousdale, Williamson and 1 more	47 min
May 2, 9:21 AM CDT	Severe Thunderstorm Warning	OHX	Dickson, Hickman, Lewis, Perry, Wayne, Williamson	24 min
May 2, 9:27 AM CDT	Severe Thunderstorm Warning	JAN	Carroll, Grenada, Leflore	63 min
May 2, 9:35 AM CDT	Severe Thunderstorm Warning	OHX	Dickson, Hickman, Lewis, Perry, Wayne, Williamson	10 min
May 2, 9:54 AM CDT	Severe Thunderstorm Warning	OHX	Hickman, Maury, Williamson	21 min
May 2, 9:59 AM CDT	Flash Flood Warning	MEG	Lafayette, Marshall, Panola, Tallahatchie, Tate, Yalobusha	4 hr
May 2, 10:15 AM CDT	Flash Flood Warning	JAN	Carroll, Grenada, Leflore, Montgomery	2 hr
May 2, 10:31 AM CDT	Flash Flood Warning	MEG	Benton, Marshall, Tippah	4 hr
May 2, 11:04 AM CDT	Severe Thunderstorm Warning	OHX	Davidson, Maury, Rutherford, Williamson	26 min
May 2, 11:20 AM CDT	Flash Flood Warning	JAN	Attala, Choctaw, Clay, Montgomery, Webster	115 min
May 2, 11:34 AM CDT	Severe Thunderstorm Warning	OHX	Davidson, Rutherford, Williamson, Wilson	26 min
May 2, 11:41 AM CDT	Flash Flood Warning	MEG	Calhoun, Chickasaw, Itawamba, Lee, Monroe, Pontotoc and 1 more	6 hr
May 2, 11:44 AM CDT	Flash Flood Warning	HUN	Colbert, Franklin, Lauderdale	12 hr

Discussions around it

SPC mesoscale discussions over the same counties from four hours before the watch to its end.

The nearest sounding before it

Little Rock, AR (KLZK), launched 00:00Z, 8.6 hours before the alert went out and 156 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: 3084 J/kg
Mixed-layer CIN: -11 J/kg
Mixed-layer LCL: 561 m above ground
0-6 km bulk shear: 68 kt
0-1 km storm-relative helicity: 305 m²/s²
0-3 km storm-relative helicity: 312 m²/s²
Significant tornado parameter: 6.8
Supercell composite: 25.5

Open this sounding in Storm Lab

SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
May 1, 9:19 PM CDT	Mesoscale Discussion	SPC	Colbert, Franklin, Lamar, Lauderdale, Lawrence, Marion	56 min
May 2, 2:33 AM CDT	Mesoscale Discussion	SPC	Colbert, Franklin, Lauderdale, Lawrence, Marion	87 min
May 2, 6:37 AM CDT	Mesoscale Discussion	SPC	Colbert, Franklin, Lamar, Lauderdale, Lawrence, Limestone and 1 more	113 min
May 2, 11:15 AM CDT	Mesoscale Discussion	SPC	Colbert, Franklin, Lauderdale	60 min
May 2, 11:57 AM CDT	Severe Thunderstorm Watch	SPC	Colbert, Cullman, Fayette, Franklin, Lamar, Lauderdale and 9 more	7 hr
May 2, 2:28 PM CDT	Mesoscale Discussion	SPC	Colbert, Cullman, Fayette, Franklin, Lamar, Lawrence and 6 more	62 min
May 2, 6:29 PM CDT	Mesoscale Discussion	SPC	Fayette, Franklin, Lamar, Lawrence, Limestone, Madison and 4 more	61 min
May 1, 7:11 PM CDT	Mesoscale Discussion	SPC	Bolivar, Coahoma, Tunica	64 min
May 1, 7:30 PM CDT	Mesoscale Discussion	SPC	Alcorn, Benton, Coahoma, DeSoto, Grenada, Lafayette and 11 more	30 min
May 1, 8:06 PM CDT	Tornado Watch PDS	SPC	Alcorn, Benton, Calhoun, Chickasaw, Coahoma, DeSoto and 16 more	8 hr
May 1, 11:38 PM CDT	Mesoscale Discussion	SPC	Alcorn, Benton, Coahoma, DeSoto, Itawamba, Lafayette and 12 more	67 min
May 2, 6:55 AM CDT	Mesoscale Discussion	SPC	Adams, Amite, Attala, Claiborne, Copiah, Covington and 31 more	2 hr
May 2, 8:01 AM CDT	Tornado Watch	SPC	Amite, Attala, Bolivar, Carroll, Choctaw, Claiborne and 52 more	7 hr
May 1, 7:07 PM CDT	Mesoscale Discussion	SPC	Bledsoe, Blount, Bradley, Cannon, Coffee, Franklin and 15 more	53 min
May 1, 10:22 PM CDT	Tornado Watch	SPC	Bedford, Benton, Cannon, Cheatham, Coffee, Davidson and 19 more	5 hr
May 2, 2:32 PM CDT	Severe Thunderstorm Watch	SPC	Anderson, Campbell, Claiborne, Hancock, Morgan, Scott and 1 more	5 hr
May 2, 6:12 PM CDT	Mesoscale Discussion	SPC	Anderson, Campbell, Claiborne, Grainger, Hamblen, Hancock and 5 more	93 min

Nearby

Tornado Watches in Tennessee, 2010 Tornado Watches in Mississippi, 2010 Tornado Watches in Alabama, 2010 Every tornado watch in 2010

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.