Alert archive / South Dakota / Mesoscale Discussions in 2008

Mesoscale Discussion 1083

May 29, 2008Dakota County, Dixon County, Nebraska; 9 counties in South Dakota

The Storm Prediction Center issued this mesoscale discussion at May 29, 2008, 5:07 PM CDT for Dakota County, Dixon County, Nebraska; 9 counties in South Dakota. It was in force for 23 min.

The area

The outline as issued.

The facts

Issued: May 29, 2008, 5:07 PM CDT (22:07 UTC)
Expired: May 29, 2008, 5:30 PM CDT
In force: 23 min
Issued by: the Storm Prediction Center

Counties Dakota County, NE, Dixon County, NE, Bon Homme County, SD, Charles Mix County, SD, Clay County, SD, Douglas County, SD, Hutchinson County, SD, Lincoln County, SD, Turner County, SD, Union County, SD, Yankton County, SD

The radar

The Sioux Falls radar (KFSD), 89 km from the middle of the area, began a volume at 22:10 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.

Tornado Watch 387May 29, 5:25 PM CDT

The nearest sounding before it

Omaha, NE (KOAX), launched 12:00Z, 10.1 hours before the alert went out and 208 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: 27 J/kg
Mixed-layer CIN: -229 J/kg
Mixed-layer LCL: 585 m above ground
0-6 km bulk shear: 39 kt
0-1 km storm-relative helicity: 265 m²/s²
0-3 km storm-relative helicity: 349 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 1.1

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
May 28, 11:41 PM CDT	Mesoscale Discussion	SPC	Antelope, Arthur, Blaine, Boyd, Brown, Cedar and 15 more	94 min
May 29, 5:32 AM CDT	Mesoscale Discussion	SPC	Antelope, Boone, Burt, Butler, Cass, Cedar and 29 more	118 min
May 29, 12:24 PM CDT	Mesoscale Discussion	SPC	Banner, Cheyenne, Kimball, Scotts Bluff	96 min
May 29, 1:33 PM CDT	Tornado Watch	SPC	Arthur, Banner, Box Butte, Chase, Cherry, Cheyenne and 14 more	7 hr
May 29, 1:44 PM CDT	Mesoscale Discussion	SPC	Blaine, Custer, Dawson, Frontier, Furnas, Gosper and 9 more	61 min
May 29, 2:30 PM CDT	Tornado Watch PDS	SPC	Adams, Antelope, Blaine, Boone, Boyd, Brown and 44 more	8 hr
May 29, 3:55 PM CDT	Mesoscale Discussion	SPC	Antelope, Blaine, Boyd, Brown, Cherry, Garfield and 10 more	95 min
May 29, 5:26 PM CDT	Tornado Watch	SPC	Dakota, Dixon	6 hr
May 29, 5:55 PM CDT	Mesoscale Discussion	SPC	Adams, Antelope, Blaine, Boone, Boyd, Brown and 63 more	35 min
May 29, 6:43 PM CDT	Tornado Watch	SPC	Burt, Butler, Cass, Colfax, Cuming, Dodge and 15 more	7 hr

Nearby

Mesoscale Discussions in South Dakota, 2008 Mesoscale Discussions in Nebraska, 2008 Every mesoscale discussion in 2008

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.