Alert archive / Mississippi / Mesoscale Discussions in 2014

Mesoscale Discussion 461

April 28, 20144 states

The Storm Prediction Center issued this mesoscale discussion at Apr 28, 2014, 5:22 PM CDT for 4 states. It was in force for 83 min.

The area

The outline as issued.

The facts

Issued
Apr 28, 2014, 5:22 PM CDT (22:22 UTC)
Expired
Apr 28, 2014, 6:45 PM CDT
In force
83 min
Issued by
the Storm Prediction Center
All 54 counties

Colbert County, AL, Cullman County, AL, Fayette County, AL, Franklin County, AL, Jackson 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, Walker County, AL, Winston County, AL, Dade County, GA, Attala County, MS, Chickasaw County, MS, Choctaw County, MS, Clay County, MS, Hinds County, MS, Holmes County, MS, Itawamba County, MS, Kemper County, MS, Leake County, MS, Lee County, MS, Lowndes County, MS, Madison County, MS, Monroe County, MS, Montgomery County, MS, Neshoba County, MS, Newton County, MS, Noxubee County, MS, Oktibbeha County, MS, Rankin County, MS, Scott County, MS, Tishomingo County, MS, Webster County, MS, Winston County, MS, Yazoo County, MS, Bradley County, TN, Coffee County, TN, Franklin County, TN, Giles County, TN, Grundy County, TN, Hamilton County, TN, Lawrence County, TN, Lincoln County, TN, Marion County, TN, Marshall County, TN, McMinn County, TN, Monroe County, TN, Moore County, TN, Sequatchie County, TN

The radar

The Columbus AFB radar (KGWX), 81 km from the middle of the area, began a volume at 22:23 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

Birmingham, AL (KBMX), launched 12:00Z, 10.4 hours before the alert went out and 116 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, Birmingham, AL at 12:00Z on 2014-04-28Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1223 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, Birmingham, AL at 12:00Z on 2014-04-28The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 268 square meters per square second.193958Sfc1 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
1223 J/kg
Mixed-layer CIN
-70 J/kg
Mixed-layer LCL
477 m above ground
0-6 km bulk shear
31 kt
0-1 km storm-relative helicity
268 m²/s²
0-3 km storm-relative helicity
428 m²/s²
Significant tornado parameter
1.1
Supercell composite
7.4

Open this sounding in Storm Lab

The text

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

<!doctype html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width, initial-scale=1">
  <title>Service Notice</title>
  <link rel="stylesheet" href="index.css">
</head>
<body>
  <main class="wrap">
    <section class="card" role="status" aria-live="polite">
      <div class="status" id="status">Temporary Notice</div>
      <h1 id="headline">This service is currently unavailable.</h1>
      <p id="message1">
        The site you requested is temporarily down for maintenance or an unexpected outage.
      </p>
      <p id="message2">
        Please try again in a few minutes.
      </p>
      <p class="small" id="detail">
        If you are an administrator, restore upstream service and remove the redirect/fallback rule when normal operations resume.
      </p>
    </section>
  </main>
  <script src="index.js"></script>
</body>
</html>

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, 2:09 PM CDTMesoscale DiscussionSPCBlount, Colbert, Cullman, Fayette, Franklin, Jackson and 13 more66 min
Apr 28, 3:49 PM CDTMesoscale DiscussionSPCColbert, Franklin, Lamar, Lawrence, Limestone, Marion and 1 more86 min
Apr 28, 5:56 PM CDTMesoscale DiscussionSPCAutauga, Bibb, Calhoun, Chambers, Cherokee, Chilton and 13 more64 min
Apr 28, 5:37 PM CDTTornado Watch PDSSPCCatoosa, Dade, Murray, Walker, Whitfield6 hr
Apr 28, 6:11 PM CDTTornado WatchSPCBartow, Bibb, Butts, Carroll, Catoosa, Chattahoochee and 50 more110 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

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.