Alert archive / South Dakota / Mesoscale Discussions in 2007

Mesoscale Discussion 1983

September 19, 20076 counties in North Dakota; 10 counties in South Dakota

The Storm Prediction Center issued this mesoscale discussion at Sep 19, 2007, 8:16 PM CDT for 6 counties in North Dakota; 10 counties in South Dakota. It was in force for 89 min.

The area

The outline as issued.

The facts

Issued: Sep 19, 2007, 8:16 PM CDT (01:16 UTC)
Expired: Sep 19, 2007, 9:45 PM CDT
In force: 89 min
Issued by: the Storm Prediction Center

Counties Dickey County, ND, Emmons County, ND, LaMoure County, ND, Logan County, ND, McIntosh County, ND, Sargent County, ND, Brown County, SD, Campbell County, SD, Clark County, SD, Day County, SD, Edmunds County, SD, Faulk County, SD, Marshall County, SD, McPherson County, SD, Spink County, SD, Walworth County, SD

The radar

The Aberdeen radar (KABR), 58 km from the middle of the area, began a volume at 01:18 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, 1.3 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 1600 m above ground
0-6 km bulk shear: 45 kt
0-1 km storm-relative helicity: 148 m²/s²
0-3 km storm-relative helicity: 357 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
Sep 20, 1:51 AM CDT	Mesoscale Discussion	SPC	Burleigh, Dickey, Emmons, Grant, Kidder, LaMoure and 7 more	2 hr
Sep 20, 5:54 PM CDT	Mesoscale Discussion	SPC	Cass, Dickey, LaMoure, Ransom, Richland, Sargent	66 min

Nearby

Mesoscale Discussions in South Dakota, 2007 Mesoscale Discussions in North 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.