Alert archive / Mississippi / Mesoscale Discussions in 2003

Mesoscale Discussion 816

May 7, 20035 states

The Storm Prediction Center issued this mesoscale discussion at May 7, 2003, 7:06 AM CDT for 5 states. It was in force for 114 min.

The area

The outline as issued.

The facts

Issued
May 7, 2003, 7:06 AM CDT (12:06 UTC)
Expired
May 7, 2003, 9:00 AM CDT
In force
114 min
Issued by
the Storm Prediction Center
All 125 counties

Colbert County, AL, Cullman County, AL, Fayette County, AL, Franklin County, AL, Jackson County, AL, Lamar County, AL, Lawrence County, AL, Limestone County, AL, Madison County, AL, Marion County, AL, Marshall County, AL, Morgan County, AL, Walker County, AL, Winston County, AL, Ashley County, AR, Bradley County, AR, Chicot County, AR, Desha County, AR, Drew County, AR, Phillips County, AR, Union County, AR, Bienville Parish, LA, East Carroll Parish, LA, Jackson Parish, LA, Lincoln Parish, LA, Madison Parish, LA, Morehouse Parish, LA, Ouachita Parish, LA, Richland Parish, LA, Union Parish, LA, West Carroll Parish, LA, Alcorn County, MS, 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, DeSoto County, MS, Grenada County, MS, Hinds 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, 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, Rankin 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, Warren County, MS, Washington County, MS, Webster County, MS, Winston County, MS, Yalobusha County, MS, Yazoo County, MS, Bedford County, TN, Benton County, TN, Cannon County, TN, Carroll County, TN, Cheatham County, TN, Chester County, TN, Coffee County, TN, Crockett County, TN, Davidson County, TN, Decatur County, TN, DeKalb County, TN, Dickson County, TN, Fayette County, TN, Franklin County, TN, Gibson County, TN, Giles County, TN, Grundy County, TN, Hardeman County, TN, Hardin County, TN, Haywood County, TN, Henderson County, TN, Henry County, TN, Hickman County, TN, Houston County, TN, Humphreys County, TN, Lawrence County, TN, Lewis County, TN, Lincoln County, TN, Madison County, TN, Marion County, TN, Marshall County, TN, Maury County, TN, McNairy County, TN, Montgomery County, TN, Moore County, TN, Perry County, TN, Robertson County, TN, Rutherford County, TN, Shelby County, TN, Stewart County, TN, Sumner County, TN, Warren County, TN, Wayne County, TN, Weakley County, TN, Williamson County, TN, Wilson County, TN

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, 0.1 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 2003-05-07Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 196 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 2003-05-07The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 90 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
196 J/kg
Mixed-layer CIN
-170 J/kg
Mixed-layer LCL
956 m above ground
0-6 km bulk shear
54 kt
0-1 km storm-relative helicity
90 m²/s²
0-3 km storm-relative helicity
19 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

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
May 6, 11:32 PM CDTMesoscale DiscussionSPCJackson, Limestone, Madison88 min
May 6, 11:50 PM CDTTornado WatchSPCColbert, Lauderdale, Lawrence, Limestone, Madison, Morgan6 hr
May 7, 1:41 AM CDTMesoscale DiscussionSPCColbert, Franklin, Lauderdale, Lawrence, Limestone, Madison and 1 more3 hr
May 7, 4:55 AM CDTTornado WatchSPCLauderdale6 hr
May 7, 7:35 AM CDTTornado WatchSPCBlount, Colbert, Cullman, Fayette, Franklin, Greene and 16 more5 hr
May 7, 10:24 AM CDTMesoscale DiscussionSPCBibb, Blount, Calhoun, Chambers, Cherokee, Chilton and 20 more2 hr
May 7, 10:35 AM CDTTornado WatchSPCBibb, Blount, Calhoun, Chambers, Cherokee, Chilton and 23 more5 hr
May 7, 10:50 AM CDTTornado WatchSPCSumter5 hr
May 7, 1:42 PM CDTMesoscale DiscussionSPCAutauga, Baldwin, Bullock, Butler, Choctaw, Clarke and 14 more2 hr
May 7, 2:30 PM CDTTornado WatchSPCRussell6 hr
May 7, 3:00 PM CDTTornado WatchSPCAutauga, Barbour, Bibb, Bullock, Butler, Calhoun and 30 more6 hr
May 7, 6:29 PM CDTMesoscale DiscussionSPCAutauga, Barbour, Bibb, Bullock, Butler, Calhoun and 32 more91 min
May 6, 7:15 PM CDTSevere Thunderstorm WatchSPCAshley, Chicot5 hr
May 6, 7:53 PM CDTMesoscale DiscussionSPCBaxter, Cleburne, Conway, Faulkner, Fulton, Garland and 19 more2 hr
May 6, 11:08 PM CDTMesoscale DiscussionSPCArkansas, Bradley, Calhoun, Clark, Cleveland, Columbia and 33 more97 min
May 6, 11:30 PM CDTTornado WatchSPCArkansas, Ashley, Baxter, Boone, Bradley, Calhoun and 67 more6 hr
May 7, 2:27 AM CDTMesoscale DiscussionSPCArkansas, Ashley, Baxter, Boone, Bradley, Calhoun and 64 more3 hr
May 7, 1:54 PM CDTMesoscale DiscussionSPCChicot2 hr
May 6, 9:53 PM CDTMesoscale DiscussionSPCMadison97 min
May 7, 9:47 AM CDTMesoscale DiscussionSPCBienville, Caldwell, Catahoula, Concordia, East Carroll, Franklin and 14 more118 min
May 7, 1:16 AM CDTMesoscale DiscussionSPCAnderson, Bedford, Benton, Bledsoe, Blount, Bradley and 49 more3 hr
May 7, 2:40 AM CDTSevere Thunderstorm WatchSPCAnderson, Bledsoe, Blount, Bradley, Campbell, Claiborne and 25 more5 hr
May 7, 4:26 AM CDTMesoscale DiscussionSPCAnderson, Bledsoe, Blount, Bradley, Campbell, Claiborne and 25 more2 hr

Nearby

Mesoscale Discussions in Mississippi, 2003Mesoscale Discussions in Tennessee, 2003Mesoscale Discussions in Alabama, 2003Every mesoscale discussion in 2003

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.