Alert archive / Mississippi / Mesoscale Discussions in 2011
Mesoscale Discussion 410
The Storm Prediction Center issued this mesoscale discussion at Apr 11, 2011, 9:46 AM CDT for 16 counties in Arkansas; 5 parishes in Louisiana; 43 counties in Mississippi. It was in force for 29 min.
The area
The outline as issued.
The facts
- Issued
- Apr 11, 2011, 9:46 AM CDT (14:46 UTC)
- Expired
- Apr 11, 2011, 10:15 AM CDT
- In force
- 29 min
- Issued by
- the Storm Prediction Center
All 64 counties
Arkansas County, AR, Ashley County, AR, Bradley County, AR, Calhoun County, AR, Chicot County, AR, Cleveland County, AR, Columbia County, AR, Dallas County, AR, Desha County, AR, Drew County, AR, Grant County, AR, Jefferson County, AR, Lincoln County, AR, Ouachita County, AR, Phillips County, AR, Union County, AR, Claiborne Parish, LA, East Carroll Parish, LA, Morehouse Parish, LA, Union Parish, LA, West Carroll Parish, LA, Attala 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, Grenada County, MS, Holmes County, MS, Humphreys County, MS, Issaquena County, MS, Itawamba County, MS, Kemper County, MS, Lafayette County, MS, Leake County, MS, Lee County, MS, Leflore County, MS, Lowndes County, MS, Marshall County, MS, Monroe County, MS, Montgomery County, MS, Neshoba County, MS, Noxubee County, MS, Oktibbeha County, MS, Panola County, MS, Pontotoc County, MS, Prentiss County, MS, Quitman County, MS, Sharkey County, MS, Sunflower County, MS, Tallahatchie County, MS, Tate County, MS, Tippah County, MS, Tishomingo County, MS, Tunica County, MS, Union County, MS, Washington County, MS, Webster County, MS, Winston County, MS, Yalobusha County, MS, Yazoo County, MS
The radar
The Little Rock radar (KLZK), 172 km from the middle of the area, began a volume at 14:48 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.
The watches that followed
Watches SPC issued over any of the same counties within four hours of this discussion.
The nearest sounding before it
Jackson, MS (KJAN), launched 12:00Z, 2.8 hours before the alert went out and 173 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
- 600 J/kg
- Mixed-layer CIN
- -183 J/kg
- Mixed-layer LCL
- 544 m above ground
- 0-6 km bulk shear
- 50 kt
- 0-1 km storm-relative helicity
- 220 m²/s²
- 0-3 km storm-relative helicity
- 297 m²/s²
- Significant tornado parameter
- 0.1
- Supercell composite
- 1.1
The text
As transmitted, in the capitals the NWS used until 2016.
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</html>SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 10, 7:28 PM CDT | Tornado Watch | SPC | Baxter, Benton, Boone, Carroll, Crawford, Franklin and 7 more | 8 hr |
| Apr 10, 8:52 PM CDT | Mesoscale Discussion | SPC | Benton, Boone, Carroll, Crawford, Madison, Washington | 53 min |
| Apr 11, 1:49 AM CDT | Tornado Watch | SPC | Hempstead, Howard, Lafayette, Little River, Miller, Nevada and 1 more | 4 hr |
| Apr 11, 2:04 AM CDT | Mesoscale Discussion | SPC | Baxter, Benton, Boone, Carroll, Conway, Crawford and 17 more | 56 min |
| Apr 11, 4:19 AM CDT | Mesoscale Discussion | SPC | Calhoun, Clark, Cleburne, Cleveland, Columbia, Conway and 28 more | 56 min |
| Apr 11, 10:31 AM CDT | Tornado Watch | SPC | Arkansas, Bradley, Cleveland, Crittenden, Desha, Drew and 6 more | 6 hr |
| Apr 11, 12:37 PM CDT | Mesoscale Discussion | SPC | Arkansas, Bradley, Cleveland, Crittenden, Desha, Drew and 6 more | 53 min |
| Apr 11, 8:58 AM CDT | Mesoscale Discussion | SPC | Alcorn, Benton, Calhoun, Chickasaw, Clay, Grenada and 19 more | 62 min |
| Apr 11, 10:41 AM CDT | Mesoscale Discussion | SPC | Alcorn, Attala, Benton, Calhoun, Carroll, Chickasaw and 29 more | 64 min |
| Apr 11, 3:56 PM CDT | Mesoscale Discussion | SPC | Alcorn, Attala, Chickasaw, Choctaw, Clarke, Clay and 29 more | 34 min |
| Apr 11, 4:05 PM CDT | Tornado Watch | SPC | Clarke, Covington, Forrest, Greene, Jasper, Jefferson Davis and 20 more | 6 hr |
Nearby
Mesoscale Discussions in Mississippi, 2011Mesoscale Discussions in Arkansas, 2011Mesoscale Discussions in Louisiana, 2011Every mesoscale discussion 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.