Alert archive / South Dakota / Mesoscale Discussions in 2007

Mesoscale Discussion 2037

September 29, 200717 counties in South Dakota

The Storm Prediction Center issued this mesoscale discussion at Sep 29, 2007, 6:26 PM MDT for 17 counties in South Dakota. It was in force for 64 min.

The area

The outline as issued.

The facts

Issued: Sep 29, 2007, 6:26 PM MDT (00:26 UTC)
Expired: Sep 29, 2007, 7:30 PM MDT
In force: 64 min
Issued by: the Storm Prediction Center

Counties Bennett County, SD, Brule County, SD, Buffalo County, SD, Edmunds County, SD, Faulk County, SD, Hand County, SD, Hughes County, SD, Hyde County, SD, Jones County, SD, Lyman County, SD, Mellette County, SD, Potter County, SD, Stanley County, SD, Sully County, SD, Todd County, SD, Tripp County, SD, Walworth County, SD

The radar

The Aberdeen radar (KABR), 158 km from the middle of the area, began a volume at 00:29 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.

Severe Thunderstorm Watch 695Sep 29, 8:30 PM MDT

The nearest sounding before it

Aberdeen, SD (KABR), launched 00:00Z, 0.4 hours before the alert went out and 122 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: 1496 J/kg
Mixed-layer CIN: -90 J/kg
Mixed-layer LCL: 2061 m above ground
0-6 km bulk shear: 39 kt
0-1 km storm-relative helicity: 143 m²/s²
0-3 km storm-relative helicity: 131 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 1.7

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
Sep 29, 8:28 PM MDT	Severe Thunderstorm Watch	SPC	Aurora, Beadle, Bon Homme, Brookings, Brule, Buffalo and 14 more	6 hr
Sep 30, 12:37 AM MDT	Mesoscale Discussion	SPC	Aurora, Beadle, Bon Homme, Brookings, Brule, Buffalo and 14 more	53 min
Sep 30, 10:01 AM MDT	Mesoscale Discussion	SPC	Bon Homme, Clay, Lincoln, Turner, Union, Yankton	59 min
Sep 30, 12:02 PM MDT	Tornado Watch	SPC	Clay, Lincoln, Turner, Union, Yankton	7 hr
Sep 30, 2:36 PM MDT	Mesoscale Discussion	SPC	Clay, Lincoln, Minnehaha, Moody, Turner, Union	54 min

Nearby

Mesoscale Discussions in South Dakota, 2007 Every mesoscale discussion in 2007

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.