Alert archive / Arkansas / Mesoscale Discussions in 2011

Mesoscale Discussion 1209

June 13, 201128 counties in Arkansas; 10 counties in Mississippi; 4 counties in Missouri

The Storm Prediction Center issued this mesoscale discussion at Jun 13, 2011, 3:25 PM CDT for 28 counties in Arkansas; 10 counties in Mississippi; 4 counties in Missouri. It was in force for 35 min.

The area

The outline as issued.

The facts

Issued: Jun 13, 2011, 3:25 PM CDT (20:25 UTC)
Expired: Jun 13, 2011, 4:00 PM CDT
In force: 35 min
Issued by: the Storm Prediction Center

All 42 counties

Arkansas County, AR, Baxter County, AR, Boone County, AR, Cleburne County, AR, Conway County, AR, Cross County, AR, Faulkner County, AR, Fulton County, AR, Independence County, AR, Izard County, AR, Jackson County, AR, Jefferson County, AR, Lee County, AR, Lonoke County, AR, Marion County, AR, Monroe County, AR, Newton County, AR, Phillips County, AR, Pope County, AR, Prairie County, AR, Pulaski County, AR, Searcy County, AR, Sharp County, AR, St. Francis County, AR, Stone County, AR, Van Buren County, AR, White County, AR, Woodruff County, AR, Douglas County, MO, Howell County, MO, Ozark County, MO, Taney County, MO, Calhoun County, MS, Chickasaw County, MS, Coahoma County, MS, Lafayette County, MS, Panola County, MS, Pontotoc County, MS, Quitman County, MS, Tallahatchie County, MS, Tunica County, MS, Yalobusha County, MS

The radar

The Little Rock radar (KLZK), 88 km from the middle of the area, began a volume at 20:28 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

Little Rock, AR (KLZK), launched 12:00Z, 8.4 hours before the alert went out and 133 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: 2335 J/kg
Mixed-layer CIN: -50 J/kg
Mixed-layer LCL: 1103 m above ground
0-6 km bulk shear: 27 kt
0-1 km storm-relative helicity: 29 m²/s²
0-3 km storm-relative helicity: 157 m²/s²
Significant tornado parameter: 0.9
Supercell composite: 6.5

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.

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, 5:59 PM CDT	Mesoscale Discussion	SPC	Chicot	61 min
Jun 13, 2:41 AM CDT	Mesoscale Discussion	SPC	Bates, Benton, Buchanan, Camden, Cass, Cedar and 19 more	2 hr
Jun 13, 5:16 AM CDT	Severe Thunderstorm Watch	SPC	Adair, Audrain, Benton, Boone, Caldwell, Callaway and 69 more	8 hr
Jun 13, 6:52 AM CDT	Mesoscale Discussion	SPC	Adair, Audrain, Benton, Boone, Caldwell, Callaway and 58 more	83 min
Jun 13, 10:04 AM CDT	Mesoscale Discussion	SPC	Adair, Audrain, Benton, Boone, Caldwell, Callaway and 50 more	86 min

Nearby

Mesoscale Discussions in Arkansas, 2011 Mesoscale Discussions in Mississippi, 2011 Mesoscale Discussions in Missouri, 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.