Alert archive / South Dakota / Mesoscale Discussions in 2012

Mesoscale Discussion 1548

July 22, 2012Traverse County, Minnesota; 15 counties in South Dakota

The Storm Prediction Center issued this mesoscale discussion at Jul 22, 2012, 8:13 PM CDT for Traverse County, Minnesota; 15 counties in South Dakota. It was in force for 62 min.

The area

The outline as issued.

The facts

Issued: Jul 22, 2012, 8:13 PM CDT (01:13 UTC)
Expired: Jul 22, 2012, 9:15 PM CDT
In force: 62 min
Issued by: the Storm Prediction Center

Counties Traverse County, MN, Brown County, SD, Campbell County, SD, Codington County, SD, Corson County, SD, Day County, SD, Dewey County, SD, Edmunds County, SD, Faulk County, SD, Grant County, SD, Marshall County, SD, McPherson County, SD, Potter County, SD, Roberts County, SD, Spink County, SD, Walworth County, SD

The radar

The Aberdeen radar (KABR), 78 km from the middle of the area, began a volume at 01:14 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

Aberdeen, SD (KABR), launched 00:00Z, 1.2 hours before the alert went out and 111 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: 2811 J/kg
Mixed-layer CIN: -87 J/kg
Mixed-layer LCL: 1819 m above ground
0-6 km bulk shear: 31 kt
0-1 km storm-relative helicity: 42 m²/s²
0-3 km storm-relative helicity: 87 m²/s²
Significant tornado parameter: 0.1
Supercell composite: 4.8

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
Jul 22, 10:58 PM CDT	Mesoscale Discussion	SPC	Aurora, Beadle, Bennett, Bon Homme, Brookings, Brule and 29 more	107 min
Jul 23, 6:31 PM CDT	Mesoscale Discussion	SPC	Butte, Custer, Dewey, Haakon, Harding, Hughes and 12 more	89 min

Nearby

Mesoscale Discussions in South Dakota, 2012 Mesoscale Discussions in Minnesota, 2012 Every mesoscale discussion in 2012

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.