Alert archive / Mississippi / Mesoscale Discussions in 2014

Mesoscale Discussion 455

April 28, 201419 counties in Alabama; 38 counties in Mississippi; 5 counties in Tennessee

The Storm Prediction Center issued this mesoscale discussion at Apr 28, 2014, 2:09 PM CDT for 19 counties in Alabama; 38 counties in Mississippi; 5 counties in Tennessee. It was in force for 66 min.

The area

The outline as issued.

The facts

Issued
Apr 28, 2014, 2:09 PM CDT (19:09 UTC)
Expired
Apr 28, 2014, 3:15 PM CDT
In force
66 min
Issued by
the Storm Prediction Center
All 62 counties

Blount County, AL, Colbert County, AL, Cullman County, AL, Fayette County, AL, Franklin County, AL, Jackson County, AL, Jefferson County, AL, Lamar County, AL, Lauderdale County, AL, Lawrence County, AL, Limestone County, AL, Madison County, AL, Marion County, AL, Marshall County, AL, Morgan County, AL, Pickens County, AL, Tuscaloosa County, AL, Walker County, AL, Winston County, AL, Alcorn County, MS, Attala County, MS, Calhoun County, MS, Carroll County, MS, Chickasaw County, MS, Choctaw County, MS, Clay County, MS, Grenada County, MS, Hinds 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, Madison County, MS, Monroe County, MS, Montgomery County, MS, Neshoba County, MS, Noxubee County, MS, Oktibbeha County, MS, Pontotoc County, MS, Prentiss County, MS, Rankin County, MS, Scott County, MS, Sharkey County, MS, Tishomingo County, MS, Union County, MS, Warren County, MS, Washington County, MS, Webster County, MS, Winston County, MS, Yalobusha County, MS, Yazoo County, MS, Giles County, TN, Hardin County, TN, Lawrence County, TN, Lincoln County, TN, Wayne County, TN

The radar

The Columbus AFB radar (KGWX), 61 km from the middle of the area, began a volume at 19:08 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 nearest sounding before it

Jackson, MS (KJAN), launched 12:00Z, 7.2 hours before the alert went out and 178 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, Jackson, MS at 12:00Z on 2014-04-28Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1444 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, Jackson, MS at 12:00Z on 2014-04-28The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 366 square meters per square second.19395878Sfc1 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
1444 J/kg
Mixed-layer CIN
-224 J/kg
Mixed-layer LCL
640 m above ground
0-6 km bulk shear
40 kt
0-1 km storm-relative helicity
366 m²/s²
0-3 km storm-relative helicity
543 m²/s²
Significant tornado parameter
0.0
Supercell composite
1.7

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 28, 6:57 AM CDTMesoscale DiscussionSPCLauderdale2 hr
Apr 28, 9:53 AM CDTMesoscale DiscussionSPCFayette, Lamar, Marion, Pickens97 min
Apr 28, 12:05 PM CDTMesoscale DiscussionSPCColbert, Fayette, Franklin, Lamar, Lauderdale, Lawrence and 6 more115 min
Apr 28, 12:39 PM CDTTornado Watch PDSSPCColbert, Cullman, DeKalb, Fayette, Franklin, Greene and 14 more8 hr
Apr 28, 3:49 PM CDTMesoscale DiscussionSPCColbert, Franklin, Lamar, Lawrence, Limestone, Marion and 1 more86 min
Apr 28, 5:22 PM CDTMesoscale DiscussionSPCColbert, Cullman, Fayette, Franklin, Jackson, Lamar and 9 more83 min
Apr 28, 5:56 PM CDTMesoscale DiscussionSPCAutauga, Bibb, Calhoun, Chambers, Cherokee, Chilton and 13 more64 min
Apr 27, 7:03 PM CDTMesoscale DiscussionSPCCalhoun, Chickasaw, Clay, Grenada, Itawamba, Lafayette and 10 more87 min
Apr 28, 1:43 AM CDTTornado WatchSPCAlcorn, Benton, Calhoun, Chickasaw, Coahoma, DeSoto and 16 more8 hr
Apr 28, 2:50 AM CDTMesoscale DiscussionSPCBolivar, Coahoma, Quitman, Tunica, Washington115 min
Apr 28, 4:40 AM CDTTornado WatchSPCBolivar, Carroll, Grenada, Holmes, Humphreys, Issaquena and 8 more7 hr
Apr 28, 7:16 AM CDTMesoscale DiscussionSPCAttala, Calhoun, Carroll, Choctaw, Claiborne, Grenada and 14 more89 min
Apr 27, 7:29 PM CDTMesoscale DiscussionSPCCrockett, Dyer, Fayette, Gibson, Haywood, Lake and 4 more91 min
Apr 27, 7:53 PM CDTTornado WatchSPCDyer, Fayette, Haywood, Lake, Lauderdale, Shelby and 1 more6 hr
Apr 27, 11:41 PM CDTMesoscale DiscussionSPCDyer, Fayette, Haywood, Lake, Lauderdale, Obion and 2 more94 min
Apr 28, 4:30 AM CDTMesoscale DiscussionSPCClay, Macon, Montgomery, Robertson, Sumner90 min
Apr 28, 12:50 PM CDTMesoscale DiscussionSPCAnderson, Bedford, Bledsoe, Bradley, Campbell, Cannon and 33 more55 min
Apr 28, 1:33 PM CDTTornado WatchSPCAnderson, Bledsoe, Blount, Bradley, Campbell, Carter and 27 more5 hr
Apr 28, 3:12 PM CDTMesoscale DiscussionSPCBlount, Carter, Claiborne, Cocke, Grainger, Greene and 13 more63 min
Apr 28, 3:13 PM CDTMesoscale DiscussionSPCBenton, Cannon, Carroll, Cheatham, Clay, Davidson and 25 more2 hr
Apr 28, 5:37 PM CDTTornado Watch PDSSPCAnderson, Bledsoe, Blount, Bradley, Campbell, Claiborne and 25 more6 hr

Nearby

Mesoscale Discussions in Mississippi, 2014Mesoscale Discussions in Alabama, 2014Mesoscale Discussions in Tennessee, 2014Every mesoscale discussion in 2014

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.