Alert archive / Mississippi / Mesoscale Discussions in 2011

Mesoscale Discussion 343

April 4, 20115 states

The Storm Prediction Center issued this mesoscale discussion at Apr 4, 2011, 10:25 AM CDT for 5 states. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued
Apr 4, 2011, 10:25 AM CDT (15:25 UTC)
Expired
Apr 4, 2011, 12:30 PM CDT
In force
2 hr
Issued by
the Storm Prediction Center
All 81 counties

Colbert County, AL, Cullman County, AL, Fayette County, AL, Franklin County, AL, Lamar County, AL, Lauderdale County, AL, Lawrence County, AL, Limestone County, AL, Madison County, AL, Marion County, AL, Morgan County, AL, Pickens County, AL, Tuscaloosa County, AL, Walker County, AL, Winston County, AL, Ashley County, AR, Chicot County, AR, East Carroll Parish, LA, Morehouse Parish, LA, West Carroll Parish, LA, Alcorn County, MS, Attala County, MS, Calhoun County, MS, Carroll County, MS, Chickasaw County, MS, Choctaw County, MS, Clay County, MS, Grenada County, MS, Holmes County, MS, Humphreys County, MS, Issaquena County, MS, Itawamba County, MS, Lafayette County, MS, Leake County, MS, Lee County, MS, Leflore County, MS, Lowndes County, MS, Madison County, MS, Monroe County, MS, Montgomery County, MS, Neshoba County, MS, Noxubee County, MS, Oktibbeha County, MS, Pontotoc County, MS, Prentiss County, MS, Sharkey County, MS, Sunflower County, MS, Tallahatchie County, MS, Tippah County, MS, Tishomingo County, MS, Union County, MS, Washington County, MS, Webster County, MS, Winston County, MS, Yalobusha County, MS, Yazoo County, MS, Bedford County, TN, Cannon County, TN, Cheatham County, TN, Davidson County, TN, Decatur County, TN, Dickson County, TN, Giles County, TN, Hardin County, TN, Hickman County, TN, Lawrence County, TN, Lewis County, TN, Lincoln County, TN, Marshall County, TN, Maury County, TN, McNairy County, TN, Moore County, TN, Perry County, TN, Robertson County, TN, Rutherford County, TN, Smith County, TN, Sumner County, TN, Trousdale County, TN, Wayne County, TN, Williamson County, TN, Wilson County, TN

The radar

The Columbus AFB radar (KGWX), 69 km from the middle of the area, began a volume at 15:25 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

Little Rock, AR (KLZK), launched 12:00Z, 3.4 hours before the alert went out and 132 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-pSkew-T log-p diagram, Little Rock, AR at 12:00Z on 2011-04-04Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1771 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Little Rock, AR at 12:00Z on 2011-04-04The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 39 square meters per square second.1939587897Sfc1 km3 km6 km9 kmRMLM
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
1771 J/kg
Mixed-layer CIN
-22 J/kg
Mixed-layer LCL
636 m above ground
0-6 km bulk shear
49 kt
0-1 km storm-relative helicity
39 m²/s²
0-3 km storm-relative helicity
71 m²/s²
Significant tornado parameter
0.6
Supercell composite
2.5

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

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SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Apr 4, 1:03 PM CDTTornado WatchSPCBlount, Colbert, Cullman, DeKalb, Fayette, Franklin and 16 more7 hr
Apr 4, 2:52 PM CDTMesoscale DiscussionSPCChoctaw, Fayette, Greene, Pickens, Sumter, Tuscaloosa113 min
Apr 4, 4:28 PM CDTMesoscale DiscussionSPCAutauga, Baldwin, Bullock, Butler, Calhoun, Chambers and 29 more62 min
Apr 4, 4:55 PM CDTTornado WatchSPCAutauga, Bibb, Blount, Calhoun, Chambers, Cherokee and 28 more6 hr
Apr 4, 5:28 PM CDTTornado WatchSPCBaldwin, Butler, Choctaw, Clarke, Conecuh, Covington and 6 more7 hr
Apr 4, 6:50 PM CDTMesoscale DiscussionSPCAutauga, Baldwin, Bibb, Blount, Butler, Calhoun and 36 more85 min
Apr 3, 9:51 PM CDTMesoscale DiscussionSPCBenton, Crawford, Madison, Washington84 min
Apr 4, 1:29 AM CDTMesoscale DiscussionSPCBenton, Carroll91 min
Apr 4, 3:00 AM CDTMesoscale DiscussionSPCClark, Conway, Dallas, Faulkner, Garland, Grant and 20 more3 hr
Apr 4, 3:44 AM CDTSevere Thunderstorm WatchSPCBradley, Calhoun, Clark, Cleburne, Cleveland, Columbia and 37 more7 hr
Apr 4, 5:48 AM CDTMesoscale DiscussionSPCBaxter, Clark, Clay, Cleburne, Conway, Craighead and 41 more117 min
Apr 4, 7:22 AM CDTTornado WatchSPCArkansas, Bradley, Calhoun, Clark, Clay, Cleburne and 42 more7 hr
Apr 4, 7:44 AM CDTSevere Thunderstorm WatchSPCColumbia, Hempstead, Howard, Lafayette, Little River, Miller and 3 more8 hr
Apr 4, 10:53 AM CDTTornado WatchSPCAshley, Chicot7 hr
Apr 4, 11:20 AM CDTMesoscale DiscussionSPCBeauregard, Bienville, Caldwell, Claiborne, De Soto, Grant and 12 more115 min
Apr 4, 11:34 AM CDTTornado WatchSPCBedford, Benton, Cannon, Cheatham, Clay, Coffee and 33 more5 hr
Apr 4, 1:25 PM CDTMesoscale DiscussionSPCClay, Pickett65 min
Apr 4, 2:05 PM CDTSevere Thunderstorm WatchSPCAnderson, Bledsoe, Blount, Bradley, Campbell, Carter and 27 more6 hr
Apr 4, 2:08 PM CDTMesoscale DiscussionSPCAnderson, Bedford, Bledsoe, Campbell, Cannon, Clay and 41 more67 min
Apr 4, 3:49 PM CDTMesoscale DiscussionSPCAnderson, Bledsoe, Blount, Bradley, Campbell, Claiborne and 28 more56 min
Apr 4, 5:00 PM CDTMesoscale DiscussionSPCAnderson, Blount, Bradley, Campbell, Carter, Claiborne and 24 more90 min

Nearby

Mesoscale Discussions in Mississippi, 2011Mesoscale Discussions in Tennessee, 2011Mesoscale Discussions in Alabama, 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.