Alert archive / South Dakota / Mesoscale Discussions in 2004

Mesoscale Discussion 666

May 11, 200412 counties in Minnesota; Richland County, North Dakota; 15 counties in South Dakota

The Storm Prediction Center issued this mesoscale discussion at May 11, 2004, 10:08 PM CDT for 12 counties in Minnesota; Richland County, North Dakota; 15 counties in South Dakota. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued: May 11, 2004, 10:08 PM CDT (03:08 UTC)
Expired: May 12, 2004, 12:15 AM CDT
In force: 2 hr
Issued by: the Storm Prediction Center

All 28 counties

Big Stone County, MN, Grant County, MN, Lac qui Parle County, MN, Lincoln County, MN, Lyon County, MN, Otter Tail County, MN, Pipestone County, MN, Stevens County, MN, Swift County, MN, Traverse County, MN, Wilkin County, MN, Yellow Medicine County, MN, Richland County, ND, Brookings County, SD, Clark County, SD, Codington County, SD, Day County, SD, Deuel County, SD, Grant County, SD, Hamlin County, SD, Hanson County, SD, Kingsbury County, SD, Lake County, SD, McCook County, SD, Miner County, SD, Moody County, SD, Roberts County, SD, Sanborn County, SD

The radar

The Aberdeen radar (KABR), 125 km from the middle of the area, began a volume at 03:09 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, 3.1 hours before the alert went out and 126 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: 2506 J/kg
Mixed-layer CIN: -8 J/kg
Mixed-layer LCL: 1786 m above ground
0-6 km bulk shear: 23 kt
0-1 km storm-relative helicity: 92 m²/s²
0-3 km storm-relative helicity: 152 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 8.0

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
May 11, 7:00 PM CDT	Tornado Watch	SPC	Becker, Beltrami, Clay, Clearwater, Hubbard, Mahnomen and 4 more	6 hr
May 11, 7:22 PM CDT	Mesoscale Discussion	SPC	Becker, Beltrami, Cass, Clearwater, Hubbard, Mahnomen	113 min
May 11, 8:45 PM CDT	Severe Thunderstorm Watch	SPC	Becker, Beltrami, Big Stone, Cass, Clay, Clearwater and 15 more	5 hr
May 12, 11:29 AM CDT	Mesoscale Discussion	SPC	Dakota, Dodge, Fillmore, Freeborn, Goodhue, Houston and 6 more	2 hr
May 12, 12:20 PM CDT	Severe Thunderstorm Watch	SPC	Dodge, Fillmore, Freeborn, Goodhue, Houston, Mower and 4 more	6 hr
May 12, 2:22 PM CDT	Mesoscale Discussion	SPC	Chisago, Dakota, Dodge, Fillmore, Freeborn, Goodhue and 9 more	83 min
May 12, 3:37 PM CDT	Mesoscale Discussion	SPC	Dakota, Dodge, Fillmore, Freeborn, Goodhue, Houston and 7 more	83 min
May 11, 9:39 PM CDT	Mesoscale Discussion	SPC	Charles Mix, Douglas, Gregory	2 hr

Nearby

Mesoscale Discussions in South Dakota, 2004 Mesoscale Discussions in Minnesota, 2004 Mesoscale Discussions in North Dakota, 2004 Every mesoscale discussion in 2004

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.