Alert archive / Mississippi / Mesoscale Discussions in 2011

Mesoscale Discussion 1211

June 13, 2011Chicot County, Arkansas; 4 parishes in Louisiana; 39 counties in Mississippi

The Storm Prediction Center issued this mesoscale discussion at Jun 13, 2011, 5:59 PM CDT for Chicot County, Arkansas; 4 parishes in Louisiana; 39 counties in Mississippi. It was in force for 61 min.

The area

The outline as issued.

The facts

Issued: Jun 13, 2011, 5:59 PM CDT (22:59 UTC)
Expired: Jun 13, 2011, 7:00 PM CDT
In force: 61 min
Issued by: the Storm Prediction Center

All 44 counties

Chicot County, AR, East Carroll Parish, LA, Madison Parish, LA, Tensas Parish, LA, West Carroll Parish, LA, Attala County, MS, Choctaw County, MS, Claiborne County, MS, Clarke County, MS, Copiah County, MS, Covington County, MS, Forrest County, MS, Greene County, MS, Hinds County, MS, Holmes County, MS, Humphreys County, MS, Issaquena County, MS, Jasper County, MS, Jefferson County, MS, Jefferson Davis County, MS, Jones County, MS, Kemper County, MS, Lamar County, MS, Lauderdale County, MS, Lawrence County, MS, Leake County, MS, Lincoln County, MS, Lowndes County, MS, Madison County, MS, Neshoba County, MS, Newton County, MS, Noxubee County, MS, Oktibbeha County, MS, Perry County, MS, Rankin County, MS, Scott County, MS, Sharkey County, MS, Simpson County, MS, Smith County, MS, Warren County, MS, Washington County, MS, Wayne County, MS, Winston County, MS, Yazoo County, MS

The radar

The Jackson/Brandon,MS radar (KDGX), 47 km from the middle of the area, began a volume at 22:58 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, 11.0 hours before the alert went out and 40 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 1497 J/kg
Mixed-layer CIN: -60 J/kg
Mixed-layer LCL: 1118 m above ground
0-6 km bulk shear: 16 kt
0-1 km storm-relative helicity: -6 m²/s²
0-3 km storm-relative helicity: 40 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.

Issued	Product	Office	Counties	Lasted
Jun 13, 9:06 AM CDT	Mesoscale Discussion	SPC	Baxter, Clay, Craighead, Crittenden, Cross, Fulton and 10 more	54 min
Jun 13, 10:05 AM CDT	Severe Thunderstorm Watch	SPC	Arkansas, Baxter, Clay, Cleburne, Craighead, Crittenden and 25 more	8 hr
Jun 13, 1:32 PM CDT	Mesoscale Discussion	SPC	Chicot, Desha	58 min
Jun 13, 2:45 PM CDT	Severe Thunderstorm Watch	SPC	Chicot	6 hr
Jun 13, 3:25 PM CDT	Mesoscale Discussion	SPC	Arkansas, Baxter, Boone, Cleburne, Conway, Cross and 22 more	35 min

Nearby

Mesoscale Discussions in Mississippi, 2011 Mesoscale Discussions in Louisiana, 2011 Mesoscale Discussions in Arkansas, 2011 Every 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.