Alert archive / South Dakota / Mesoscale Discussions in 2005

Mesoscale Discussion 1856

July 24, 20058 counties in South Dakota; Crook County, Weston County, Wyoming

The Storm Prediction Center issued this mesoscale discussion at Jul 24, 2005, 10:23 PM MDT for 8 counties in South Dakota; Crook County, Weston County, Wyoming. It was in force for 67 min.

The area

The outline as issued.

The facts

Issued: Jul 24, 2005, 10:23 PM MDT (04:23 UTC)
Expired: Jul 24, 2005, 11:30 PM MDT
In force: 67 min
Issued by: the Storm Prediction Center

Counties Bennett County, SD, Custer County, SD, Fall River County, SD, Haakon County, SD, Jackson County, SD, Lawrence County, SD, Oglala Lakota County, SD, Pennington County, SD, Crook County, WY, Weston County, WY

The radar

The Rapid City radar (KUDX), 55 km from the middle of the area, began a volume at 04:24 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

Bismarck Municip, ND (KBIS), launched 00:00Z, 4.4 hours before the alert went out and 378 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: 225 J/kg
Mixed-layer CIN: -228 J/kg
Mixed-layer LCL: 1629 m above ground
0-6 km bulk shear: 45 kt
0-1 km storm-relative helicity: 170 m²/s²
0-3 km storm-relative helicity: 443 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
Jul 24, 6:13 PM MDT	Mesoscale Discussion	SPC	Butte, Harding, Lawrence, Meade, Perkins	2 hr
Jul 24, 7:26 PM MDT	Mesoscale Discussion	SPC	Clay, Union	94 min
Jul 24, 8:45 PM MDT	Severe Thunderstorm Watch	SPC	Bon Homme, Clay, Davison, Douglas, Hanson, Hutchinson and 10 more	5 hr
Jul 24, 8:53 PM MDT	Mesoscale Discussion	SPC	Bennett, Custer, Fall River, Jackson, Oglala Lakota, Pennington	67 min
Jul 24, 9:00 PM MDT	Severe Thunderstorm Watch	SPC	Bennett, Custer, Fall River, Haakon, Jackson, Lawrence and 2 more	4 hr
Jul 24, 10:45 PM MDT	Mesoscale Discussion	SPC	Bon Homme, Clay, Davison, Douglas, Hanson, Hutchinson and 10 more	60 min
Jul 25, 1:39 AM MDT	Mesoscale Discussion	SPC	Butte, Corson, Harding, Perkins	2 hr
Jul 25, 12:55 PM MDT	Mesoscale Discussion	SPC	Clay, Lincoln, Minnehaha, Moody, Union	2 hr

Nearby

Mesoscale Discussions in South Dakota, 2005 Mesoscale Discussions in Wyoming, 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.