Alert archive / Arkansas / Mesoscale Discussions in 2013

Mesoscale Discussion 23

January 13, 20134 counties in Arkansas; Bolivar County, Coahoma County, Mississippi

The Storm Prediction Center issued this mesoscale discussion at Jan 13, 2013, 1:18 AM CST for 4 counties in Arkansas; Bolivar County, Coahoma County, Mississippi. It was in force for 87 min.

The area

The outline as issued.

The facts

Issued: Jan 13, 2013, 1:18 AM CST (07:18 UTC)
Expired: Jan 13, 2013, 2:45 AM CST
In force: 87 min
Issued by: the Storm Prediction Center

Counties Ashley County, AR, Chicot County, AR, Desha County, AR, Drew County, AR, Bolivar County, MS, Coahoma County, MS

The radar

The Little Rock radar (KLZK), 167 km from the middle of the area, began a volume at 07:19 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 00:00Z, 7.3 hours before the alert went out and 215 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: 924 J/kg
Mixed-layer CIN: -1 J/kg
Mixed-layer LCL: 568 m above ground
0-6 km bulk shear: 74 kt
0-1 km storm-relative helicity: 485 m²/s²
0-3 km storm-relative helicity: 531 m²/s²
Significant tornado parameter: 3.3
Supercell composite: 15.7

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
Jan 12, 6:18 PM CST	Mesoscale Discussion	SPC	Arkansas, Bradley, Calhoun, Clark, Clay, Cleburne and 48 more	117 min
Jan 12, 9:25 PM CST	Mesoscale Discussion	SPC	Arkansas, Bradley, Calhoun, Clark, Clay, Cleveland and 31 more	2 hr
Jan 12, 10:33 PM CST	Mesoscale Discussion	SPC	Ashley, Bradley, Calhoun, Columbia, Drew, Ouachita and 1 more	87 min
Jan 12, 11:29 PM CST	Tornado Watch	SPC	Arkansas, Ashley, Bradley, Calhoun, Chicot, Cleveland and 9 more	5 hr
Jan 13, 3:53 AM CST	Mesoscale Discussion	SPC	Arkansas, Ashley, Bradley, Chicot, Desha, Drew and 5 more	97 min
Jan 13, 2:30 PM CST	Mesoscale Discussion	SPC	Covington, Forrest, George, Greene, Hancock, Harrison and 8 more	90 min
Jan 13, 2:46 PM CST	Mesoscale Discussion	SPC	Kemper, Lauderdale, Lowndes, Monroe, Neshoba, Newton and 1 more	119 min

Nearby

Mesoscale Discussions in Arkansas, 2013 Mesoscale Discussions in Mississippi, 2013 Every 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.