Alert archive / Mississippi / Mesoscale Discussions in 2013

Mesoscale Discussion 84

January 29, 20137 states

The Storm Prediction Center issued this mesoscale discussion at Jan 29, 2013, 9:49 PM CST for 7 states. It was in force for 116 min.

The area

The outline as issued.

The facts

Issued
Jan 29, 2013, 9:49 PM CST (03:49 UTC)
Expired
Jan 29, 2013, 11:45 PM CST
In force
116 min
Issued by
the Storm Prediction Center
All 113 counties

Colbert County, AL, Franklin County, AL, Lauderdale County, AL, Arkansas County, AR, Ashley County, AR, Chicot County, AR, Crittenden County, AR, Cross County, AR, Desha County, AR, Drew County, AR, Lee County, AR, Mississippi County, AR, Phillips County, AR, Poinsett County, AR, St. Francis County, AR, Calloway County, KY, Fulton County, KY, Caldwell Parish, LA, Catahoula Parish, LA, East Carroll Parish, LA, Franklin Parish, LA, LaSalle Parish, LA, Madison Parish, LA, Morehouse Parish, LA, Ouachita Parish, LA, Richland Parish, LA, Tensas Parish, LA, West Carroll Parish, LA, Dunklin County, MO, Pemiscot County, MO, Alcorn County, MS, Attala County, MS, Benton County, MS, Bolivar County, MS, Calhoun County, MS, Carroll County, MS, Chickasaw County, MS, Choctaw County, MS, Claiborne County, MS, Clay County, MS, Coahoma County, MS, Copiah County, MS, DeSoto County, MS, Grenada County, MS, Hinds County, MS, Holmes County, MS, Humphreys County, MS, Issaquena County, MS, Itawamba County, MS, Jefferson County, MS, Lafayette County, MS, Leake County, MS, Lee County, MS, Leflore County, MS, Madison County, MS, Marshall County, MS, Monroe County, MS, Montgomery 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, Yalobusha County, MS, Yazoo County, MS, Benton County, TN, Carroll County, TN, Cheatham County, TN, Chester County, TN, Crockett County, TN, Davidson County, TN, Decatur County, TN, Dickson County, TN, Dyer County, TN, Fayette County, TN, Gibson 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, Lake County, TN, Lauderdale County, TN, Lawrence County, TN, Lewis County, TN, Madison County, TN, Maury County, TN, McNairy County, TN, Montgomery County, TN, Obion County, TN, Perry County, TN, Robertson County, TN, Shelby County, TN, Stewart County, TN, Tipton County, TN, Wayne County, TN, Weakley County, TN, Williamson County, TN

The radar

The Columbus AFB radar (KGWX), 115 km from the middle of the area, began a volume at 03:49 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 00:00Z, 3.8 hours before the alert went out and 71 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 00:00Z on 2013-01-30Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 784 joules per kilogram.LCLEL10008507005003002001001 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 00:00Z on 2013-01-30The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 508 square meters per square second.1939587897117136Sfc1 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
784 J/kg
Mixed-layer CIN
-2 J/kg
Mixed-layer LCL
571 m above ground
0-6 km bulk shear
66 kt
0-1 km storm-relative helicity
508 m²/s²
0-3 km storm-relative helicity
586 m²/s²
Significant tornado parameter
3.0
Supercell composite
11.5

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
Jan 30, 1:31 AM CSTMesoscale DiscussionSPCBlount, Calhoun, Cherokee, Colbert, Cullman, DeKalb and 17 more29 min
Jan 30, 1:46 AM CSTTornado WatchSPCBlount, Colbert, Cullman, DeKalb, Fayette, Franklin and 16 more8 hr
Jan 30, 4:27 AM CSTMesoscale DiscussionSPCMobile, Washington93 min
Jan 30, 5:01 AM CSTMesoscale DiscussionSPCAutauga, Bibb, Bullock, Butler, Calhoun, Chambers and 26 more29 min
Jan 30, 5:15 AM CSTTornado WatchSPCAutauga, Baldwin, Barbour, Bibb, Bullock, Butler and 34 more7 hr
Jan 30, 7:43 AM CSTMesoscale DiscussionSPCAutauga, Barbour, Bibb, Blount, Bullock, Calhoun and 36 more62 min
Jan 30, 10:09 AM CSTMesoscale DiscussionSPCBarbour, Bullock, Chambers, Clay, Cleburne, Crenshaw and 9 more96 min
Jan 30, 11:50 AM CSTMesoscale DiscussionSPCBullock, Chambers, Elmore, Lee, Macon, Montgomery and 3 more85 min
Jan 30, 12:19 PM CSTTornado WatchSPCBarbour, Bullock, Butler, Chambers, Coffee, Conecuh and 16 more9 hr
Jan 29, 8:11 PM CSTMesoscale DiscussionSPCArkansas, Ashley, Bradley, Calhoun, Chicot, Clark and 35 more94 min
Jan 29, 6:08 PM CSTMesoscale DiscussionSPCBallard, Caldwell, Carlisle, Crittenden, Daviess, Fulton and 13 more2 hr
Jan 29, 7:13 PM CSTTornado WatchSPCBallard, Carlisle, Fulton, Graves, Hickman, McCracken6 hr
Jan 29, 9:19 PM CSTMesoscale DiscussionSPCAllen, Ballard, Barren, Breckinridge, Bullitt, Butler and 39 more86 min
Jan 29, 9:35 PM CSTTornado WatchSPCAllen, Barren, Breckinridge, Bullitt, Butler, Caldwell and 33 more6 hr
Jan 30, 12:45 AM CSTMesoscale DiscussionSPCBoone, Bracken, Campbell, Carroll, Gallatin, Grant and 4 more60 min
Jan 30, 2:33 AM CSTMesoscale DiscussionSPCAdair, Allen, Anderson, Barren, Bath, Boone and 76 more57 min
Jan 30, 3:35 AM CSTTornado WatchSPCAdair, Allen, Anderson, Barren, Bath, Bourbon and 57 more4 hr
Jan 30, 4:51 AM CSTTornado WatchSPCBath, Bell, Boyd, Breathitt, Carter, Clay and 31 more7 hr
Jan 30, 6:38 AM CSTMesoscale DiscussionSPCBell, Boyd, Breathitt, Carter, Clay, Elliott and 21 more97 min
Jan 29, 7:31 PM CSTMesoscale DiscussionSPCMadison, Tensas119 min
Jan 30, 3:03 AM CSTMesoscale DiscussionSPCConcordia, Tensas57 min
Jan 29, 10:07 PM CSTTornado WatchSPCAdams, Alcorn, Attala, Benton, Calhoun, Carroll and 37 more6 hr
Jan 30, 3:45 AM CSTTornado WatchSPCAttala, Choctaw, Clarke, Clay, Copiah, Covington and 23 more4 hr
Jan 29, 8:29 PM CSTMesoscale DiscussionSPCAtchison4 hr

Nearby

Mesoscale Discussions in Mississippi, 2013Mesoscale Discussions in Tennessee, 2013Mesoscale Discussions in Arkansas, 2013Every mesoscale discussion in 2013

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.