Alert archive / South Dakota / Mesoscale Discussions in 2005

Mesoscale Discussion 2007

August 17, 200517 counties in Nebraska; 28 counties in South Dakota

The Storm Prediction Center issued this mesoscale discussion at Aug 17, 2005, 3:16 PM CDT for 17 counties in Nebraska; 28 counties in South Dakota. It was in force for 89 min.

The area

The outline as issued.

The facts

Issued: Aug 17, 2005, 3:16 PM CDT (20:16 UTC)
Expired: Aug 17, 2005, 4:45 PM CDT
In force: 89 min
Issued by: the Storm Prediction Center

All 45 counties

Antelope County, NE, Blaine County, NE, Boyd County, NE, Brown County, NE, Cherry County, NE, Garfield County, NE, Holt County, NE, Hooker County, NE, Keya Paha County, NE, Knox County, NE, Logan County, NE, Loup County, NE, McPherson County, NE, Pierce County, NE, Rock County, NE, Thomas County, NE, Wheeler County, NE, Aurora County, SD, Beadle County, SD, Bon Homme County, SD, Brule County, SD, Buffalo County, SD, Charles Mix County, SD, Clark County, SD, Davison County, SD, Douglas County, SD, Gregory County, SD, Hand County, SD, Hanson County, SD, Hughes County, SD, Hutchinson County, SD, Hyde County, SD, Jerauld County, SD, Jones County, SD, Kingsbury County, SD, Lyman County, SD, McCook County, SD, Mellette County, SD, Miner County, SD, Sanborn County, SD, Spink County, SD, Stanley County, SD, Todd County, SD, Tripp County, SD, Yankton County, SD

The radar

The North Platte radar (KLNX), 175 km from the middle of the area, began a volume at 20:19 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 watches that followed

Watches SPC issued over any of the same counties within four hours of this discussion.

Severe Thunderstorm Watch 728Aug 17, 4:55 PM CDT

The nearest sounding before it

Aberdeen, SD (KABR), launched 12:00Z, 8.3 hours before the alert went out and 200 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: 438 J/kg
Mixed-layer CIN: -205 J/kg
Mixed-layer LCL: 980 m above ground
0-6 km bulk shear: 27 kt
0-1 km storm-relative helicity: 50 m²/s²
0-3 km storm-relative helicity: 47 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.2

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
Aug 17, 1:03 PM CDT	Mesoscale Discussion	SPC	Brown, Campbell, Corson, Edmunds, McPherson, Marshall and 2 more	87 min
Aug 17, 1:35 PM CDT	Severe Thunderstorm Watch	SPC	Brown, Campbell, Corson, Dewey, Edmunds, Faulk and 6 more	8 hr
Aug 17, 4:55 PM CDT	Severe Thunderstorm Watch	SPC	Aurora, Beadle, Bon Homme, Brule, Buffalo, Charles Mix and 22 more	5 hr
Aug 17, 5:18 PM CDT	Mesoscale Discussion	SPC	Brown, Campbell, Corson, Dewey, Edmunds, McPherson and 4 more	117 min

Nearby

Mesoscale Discussions in South Dakota, 2005 Mesoscale Discussions in Nebraska, 2005 Every mesoscale discussion in 2005

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.