Alert archive / Mississippi / Severe Thunderstorm Watches in 2011
Severe Thunderstorm Watch 200
The Storm Prediction Center issued this severe thunderstorm watch at Apr 25, 2011, 9:17 AM CDT for 4 counties in Arkansas; 22 counties in Mississippi; 16 counties in Tennessee. It was in force for 6 hr.
The area
The outline as issued.
The facts
- Issued
- Apr 25, 2011, 9:17 AM CDT (14:17 UTC)
- Expired
- Apr 25, 2011, 3:00 PM CDT
- In force
- 6 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 1.5 in
- Strongest gust expected
- 60 kt
All 42 counties
Crittenden County, AR, Lee County, AR, Phillips County, AR, St. Francis County, AR, Alcorn County, MS, Benton County, MS, Calhoun County, MS, Chickasaw County, MS, Coahoma County, MS, DeSoto County, MS, Itawamba County, MS, Lafayette County, MS, Lee County, MS, Marshall County, MS, Monroe County, MS, Panola County, MS, Pontotoc County, MS, Prentiss County, MS, Quitman County, MS, Tallahatchie County, MS, Tate County, MS, Tippah County, MS, Tishomingo County, MS, Tunica County, MS, Union County, MS, Yalobusha County, MS, Carroll County, TN, Chester County, TN, Crockett County, TN, Decatur County, TN, Fayette County, TN, Gibson County, TN, Hardeman County, TN, Hardin County, TN, Haywood County, TN, Henderson County, TN, Henry County, TN, Madison County, TN, McNairy County, TN, Shelby County, TN, Tipton County, TN, Weakley County, TN
The radar
The Memphis radar (KNQA), 63 km from the middle of the area, began a volume at 14:18 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
- 20%
- One or more EF2 to EF5 tornadoes
- 5%
- Ten or more severe wind reports
- 30%
- 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
- 70%
Warnings issued inside it
11 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 25, 12:13 PM CDT | Severe Thunderstorm Warning | MEG | Crittenden | 47 min |
| Apr 25, 12:24 PM CDT | Severe Thunderstorm Warning | MEG | Crittenden, Mississippi | 51 min |
| Apr 25, 12:30 PM CDT | Tornado Warning | MEG | Benton, DeSoto, Marshall | 45 min |
| Apr 25, 12:56 PM CDT | Severe Thunderstorm Warning | MEG | Fayette, Hardeman, Shelby | 49 min |
| Apr 25, 12:59 PM CDT | Tornado Warning | MEG | Fayette, Hardeman, Haywood, Madison, Shelby | 46 min |
| Apr 25, 1:34 PM CDT | Severe Thunderstorm Warning | MEG | Carroll, Chester, Crockett, Dyer, Gibson, Hardeman and 3 more | 41 min |
| Apr 25, 1:41 PM CDT | Tornado Warning | MEG | Carroll, Crockett, Gibson, Haywood, Madison, Weakley | 49 min |
| Apr 25, 1:44 PM CDT | Severe Thunderstorm Warning | MEG | Chester, Fayette, Hardeman, Haywood, McNairy, Madison | 46 min |
| Apr 25, 2:11 PM CDT | Severe Thunderstorm Warning | MEG | Carroll, Chester, Decatur, Gibson, Hardeman, Hardin and 5 more | 49 min |
| Apr 25, 2:36 PM CDT | Severe Thunderstorm Warning | MEG | Carroll, Henry, Weakley | 39 min |
| Apr 25, 2:47 PM CDT | Tornado Warning | MEG | Carroll, Henry, Weakley | 43 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 12:00Z, 2.3 hours before the alert went out and 8 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.
- Mixed-layer CAPE
- 11 J/kg
- Mixed-layer CIN
- -189 J/kg
- Mixed-layer LCL
- 729 m above ground
- 0-6 km bulk shear
- 55 kt
- 0-1 km storm-relative helicity
- 210 m²/s²
- 0-3 km storm-relative helicity
- 321 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 4.8
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 24, 10:13 PM CDT | Mesoscale Discussion | SPC | Clark, Cleburne, Conway, Faulkner, Garland, Grant and 15 more | 2 hr |
| Apr 24, 11:43 PM CDT | Severe Thunderstorm Watch | SPC | Hempstead, Howard, Little River, Miller, Nevada, Sevier | 5 hr |
| Apr 25, 1:57 AM CDT | Mesoscale Discussion | SPC | Cleveland, Dallas, Jefferson, Lincoln | 63 min |
| Apr 25, 4:41 AM CDT | Severe Thunderstorm Watch | SPC | Arkansas, Bradley, Calhoun, Clark, Cleveland, Columbia and 25 more | 7 hr |
| Apr 25, 7:23 AM CDT | Mesoscale Discussion | SPC | Calhoun, Clark, Cleveland, Columbia, Dallas, Garland and 11 more | 97 min |
| Apr 25, 8:37 AM CDT | Mesoscale Discussion | SPC | Arkansas, Cleveland, Crittenden, Desha, Drew, Jefferson and 7 more | 53 min |
| Apr 25, 10:46 AM CDT | Mesoscale Discussion | SPC | Hempstead, Howard, Lafayette, Little River, Miller, Sevier | 59 min |
| Apr 25, 11:00 AM CDT | Tornado Watch | SPC | Carroll, Clark, Crawford, Franklin, Hempstead, Howard and 13 more | 7 hr |
| Apr 25, 1:15 PM CDT | Mesoscale Discussion | SPC | Crittenden, Cross, Lee, Phillips, St. Francis | 60 min |
| Apr 25, 1:28 PM CDT | Mesoscale Discussion | SPC | Crawford, Franklin, Howard, Johnson, Little River, Logan and 5 more | 92 min |
| Apr 25, 3:08 PM CDT | Mesoscale Discussion | SPC | Arkansas, Ashley, Baxter, Boone, Bradley, Calhoun and 29 more | 37 min |
| Apr 25, 3:22 PM CDT | Tornado Watch | SPC | Arkansas, Baxter, Boone, Bradley, Calhoun, Clark and 50 more | 8 hr |
| Apr 25, 4:34 PM CDT | Mesoscale Discussion | SPC | Arkansas, Clay, Craighead, Crittenden, Cross, Greene and 11 more | 56 min |
| Apr 25, 4:50 PM CDT | Tornado Watch | SPC | Clay, Craighead, Crittenden, Cross, Greene, Lee and 4 more | 7 hr |
| Apr 25, 1:48 PM CDT | Mesoscale Discussion | SPC | Bedford, Benton, Carroll, Cheatham, Davidson, Decatur and 20 more | 87 min |
| Apr 25, 2:29 PM CDT | Severe Thunderstorm Watch | SPC | Benton, Cheatham, Davidson, Dickson, Hickman, Houston and 14 more | 4 hr |
Nearby
Severe Thunderstorm Watches in Mississippi, 2011Severe Thunderstorm Watches in Tennessee, 2011Severe Thunderstorm Watches in Arkansas, 2011Every 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.