Alert archive / Tennessee / Tornado Watches in 2010

Tornado Watch 119

May 1, 201016 counties in Mississippi; 18 counties in Tennessee

The Storm Prediction Center issued this tornado watch at May 1, 2010, 12:01 AM CDT for 16 counties in Mississippi; 18 counties in Tennessee. It was in force for 3 hr.

The area

The outline as issued.

The facts

Issued: May 1, 2010, 12:01 AM CDT (05:01 UTC)
Expired: May 1, 2010, 3:15 AM CDT
In force: 3 hr
Issued by: the Storm Prediction Center
Largest hail expected: 1.5 in
Strongest gust expected: 60 kt

All 34 counties

Alcorn County, MS, Benton County, MS, Calhoun County, MS, Coahoma County, MS, DeSoto County, MS, Lafayette County, MS, Marshall County, MS, Panola County, MS, Pontotoc County, MS, Quitman County, MS, Tallahatchie County, MS, Tate County, MS, Tippah County, MS, Tunica County, MS, Union County, MS, Yalobusha County, MS, Carroll County, TN, Chester County, TN, Crockett County, TN, Dyer County, TN, Fayette County, TN, Gibson County, TN, Hardeman County, TN, Haywood County, TN, Henderson County, TN, Henry County, TN, Lake County, TN, Lauderdale County, TN, Madison County, TN, McNairy County, TN, Obion County, TN, Shelby County, TN, Tipton County, TN, Weakley County, TN

The radar

The Memphis radar (KNQA), 32 km from the middle of the area, began a volume at 05:03 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: 50%
One or more EF2 to EF5 tornadoes: 30%
Ten or more severe wind reports: 30%
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: 30%
Six or more combined severe hail and wind reports: 70%

Warnings issued inside it

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

Issued	Product	Office	Counties	Lasted
May 1, 12:03 AM CDT	Severe Thunderstorm Warning	MEG	Lauderdale, Shelby, Tipton	42 min
May 1, 12:21 AM CDT	Severe Thunderstorm Warning	MEG	Crockett, Dyer, Haywood, Lake, Lauderdale, Obion	39 min
May 1, 12:21 AM CDT	Severe Thunderstorm Warning	MEG	Lauderdale, Tipton	39 min
May 1, 12:42 AM CDT	Severe Thunderstorm Warning	MEG	Lauderdale, Tipton	48 min
May 1, 12:50 AM CDT	Severe Thunderstorm Warning	MEG	Crockett, Dyer, Gibson, Lake, Lauderdale, Obion and 1 more	40 min
May 1, 12:55 AM CDT	Severe Thunderstorm Warning	MEG	Crockett, Haywood, Lauderdale, Tipton	50 min
May 1, 1:13 AM CDT	Tornado Warning	MEG	Lake, Obion	26 min
May 1, 1:19 AM CDT	Severe Thunderstorm Warning	MEG	Fayette, Haywood, Shelby, Tipton	41 min
May 1, 1:21 AM CDT	Flash Flood Warning	MEG	Lauderdale	3 hr
May 1, 1:25 AM CDT	Severe Thunderstorm Warning	MEG	Carroll, Crockett, Dyer, Gibson, Henry, Lake and 2 more	50 min
May 1, 1:28 AM CDT	Severe Thunderstorm Warning	MEG	Lauderdale, Shelby, Tipton	47 min
May 1, 1:35 AM CDT	Severe Thunderstorm Warning	MEG	Dyer, Lauderdale	40 min
May 1, 1:39 AM CDT	Severe Thunderstorm Warning	MEG	Crockett, Gibson, Haywood, Lauderdale, Madison, Tipton	51 min
May 1, 1:41 AM CDT	Flash Flood Warning	MEG	Dyer, Lake, Obion	4 hr
May 1, 2:08 AM CDT	Severe Thunderstorm Warning	MEG	Carroll, Crockett, Decatur, Gibson, Henderson, Henry and 3 more	52 min
May 1, 2:13 AM CDT	Severe Thunderstorm Warning	MEG	Lauderdale, Shelby, Tipton	47 min
May 1, 2:19 AM CDT	Severe Thunderstorm Warning	MEG	Crockett, Gibson, Haywood, Lauderdale, Madison, Tipton	41 min
May 1, 2:21 AM CDT	Flash Flood Warning Emergency	MEG	Fayette, Haywood, Lauderdale, Shelby, Tipton	12 hr
May 1, 2:47 AM CDT	Flash Flood Warning	MEG	Carroll, Crockett, Dyer, Gibson, Haywood, Henry and 4 more	10 hr
May 1, 2:52 AM CDT	Severe Thunderstorm Warning	MEG	Chester, Crockett, Fayette, Hardeman, Haywood, Henderson and 4 more	53 min
May 1, 2:56 AM CDT	Severe Thunderstorm Warning	MEG	Carroll, Decatur, Gibson, Henderson, Henry, Madison and 1 more	49 min
May 1, 3:00 AM CDT	Severe Thunderstorm Warning	MEG	Lauderdale, Shelby, Tipton	45 min
May 1, 3:08 AM CDT	Tornado Warning	MEG	Crockett, Fayette, Hardeman, Haywood, Madison, Tipton	52 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

Little Rock, AR (KLZK), launched 00:00Z, 5.0 hours before the alert went out and 86 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: 3037 J/kg
Mixed-layer CIN: -3 J/kg
Mixed-layer LCL: 525 m above ground
0-6 km bulk shear: 58 kt
0-1 km storm-relative helicity: 188 m²/s²
0-3 km storm-relative helicity: 226 m²/s²
Significant tornado parameter: 4.6
Supercell composite: 15.8

Open this sounding in Storm Lab

SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Apr 30, 7:26 PM CDT	Mesoscale Discussion	SPC	Baxter, Cleburne, Conway, Faulkner, Fulton, Garland and 15 more	2 hr
Apr 30, 9:09 PM CDT	Tornado Watch PDS	SPC	Arkansas, Bradley, Calhoun, Clark, Clay, Cleburne and 49 more	7 hr
Apr 30, 10:43 PM CDT	Mesoscale Discussion	SPC	Arkansas, Bradley, Calhoun, Clark, Clay, Cleburne and 49 more	62 min
Apr 30, 11:41 PM CDT	Mesoscale Discussion	SPC	Arkansas, Bradley, Calhoun, Clark, Clay, Cleburne and 45 more	64 min
May 1, 2:25 AM CDT	Mesoscale Discussion	SPC	Arkansas, Ashley, Bradley, Calhoun, Chicot, Clark and 40 more	95 min
May 1, 3:11 AM CDT	Tornado Watch	SPC	Arkansas, Ashley, Bradley, Calhoun, Chicot, Clark and 24 more	8 hr
May 1, 6:17 AM CDT	Mesoscale Discussion	SPC	Arkansas, Ashley, Bradley, Calhoun, Chicot, Cleveland and 9 more	88 min
May 1, 7:48 AM CDT	Mesoscale Discussion	SPC	Arkansas, Ashley, Bradley, Calhoun, Chicot, Cleveland and 22 more	57 min
May 1, 9:52 AM CDT	Tornado Watch	SPC	Ashley, Chicot	8 hr
May 1, 11:19 AM CDT	Mesoscale Discussion	SPC	Crittenden	56 min
May 1, 1:37 PM CDT	Mesoscale Discussion	SPC	Arkansas, Ashley, Bradley, Calhoun, Chicot, Clark and 38 more	53 min
May 1, 3:11 PM CDT	Mesoscale Discussion	SPC	Benton	94 min
May 1, 3:18 PM CDT	Tornado Watch PDS	SPC	Arkansas, Bradley, Calhoun, Clark, Cleburne, Cleveland and 43 more	7 hr
May 1, 5:43 PM CDT	Mesoscale Discussion	SPC	Arkansas, Ashley, Bradley, Calhoun, Clark, Cleveland and 31 more	62 min
Apr 30, 8:36 PM CDT	Mesoscale Discussion	SPC	Ballard, Carlisle, Fulton, Hickman, McCracken	54 min
Apr 30, 9:03 PM CDT	Tornado Watch	SPC	Ballard, Carlisle, Fulton, Graves, Hickman, McCracken	6 hr
May 1, 1:11 AM CDT	Tornado Watch	SPC	Breckinridge, Butler, Caldwell, Calloway, Christian, Crittenden and 17 more	6 hr
May 1, 2:54 AM CDT	Mesoscale Discussion	SPC	Allen, Anderson, Barren, Boone, Breckinridge, Bullitt and 38 more	2 hr
May 1, 4:40 AM CDT	Tornado Watch	SPC	Adair, Allen, Barren, Boyle, Bullitt, Casey and 21 more	4 hr
Apr 30, 9:05 PM CDT	Mesoscale Discussion	SPC	Attala, Calhoun, Chickasaw, Choctaw, Clay, Itawamba and 18 more	55 min
May 1, 2:54 PM CDT	Mesoscale Discussion	SPC	Alcorn, Benton, Coahoma, DeSoto, Itawamba, Lafayette and 13 more	66 min
May 1, 5:04 PM CDT	Mesoscale Discussion	SPC	Alcorn, Attala, Benton, Calhoun, Carroll, Chickasaw and 29 more	56 min
Apr 30, 7:12 PM CDT	Mesoscale Discussion	SPC	Crawford, Dent, Franklin, Gasconade, Iron, Jefferson and 13 more	63 min
May 1, 5:35 PM CDT	Tornado Watch	SPC	Anderson, Bedford, Bledsoe, Blount, Bradley, Coffee and 19 more	4 hr

Nearby

Tornado Watches in Tennessee, 2010 Tornado Watches in Mississippi, 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.