Alert archive / Minnesota / Mesoscale Discussions in 2025

Mesoscale Discussion 2000

August 21, 20256 counties in Minnesota; 6 counties in South Dakota

The Storm Prediction Center issued this mesoscale discussion at Aug 21, 2025, 8:24 PM CDT for 6 counties in Minnesota; 6 counties in South Dakota. It was in force for 96 min.

The area

The outline as issued.

The facts

Issued: Aug 21, 2025, 8:24 PM CDT (01:24 UTC)
Expired: Aug 21, 2025, 10:00 PM CDT
In force: 96 min
Issued by: the Storm Prediction Center
Concerning: Severe potential...watch unlikely
Chance of a watch: 20%

Counties Big Stone County, MN, Lac qui Parle County, MN, Lincoln County, MN, Lyon County, MN, Pipestone County, MN, Yellow Medicine County, MN, Brookings County, SD, Codington County, SD, Deuel County, SD, Grant County, SD, Hamlin County, SD, Moody County, SD

The radar

The Sioux Falls radar (KFSD), 125 km from the middle of the area, began a volume at 01:27 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, 1.4 hours before the alert went out and 153 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: 2017 J/kg
Mixed-layer CIN: -96 J/kg
Mixed-layer LCL: 1254 m above ground
0-6 km bulk shear: 47 kt
0-1 km storm-relative helicity: -42 m²/s²
0-3 km storm-relative helicity: 49 m²/s²
Significant tornado parameter: -0.3
Supercell composite: -6.1

Open this sounding in Storm Lab

The text

As transmitted.

<!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 22, 11:52 AM CDT	Mesoscale Discussion	SPC	Chisago, Kanabec, Pine	113 min
Aug 21, 11:57 PM CDT	Mesoscale Discussion	SPC	Beadle, Brookings, Brule, Buffalo, Butte, Clark and 25 more	3 hr
Aug 22, 12:05 AM CDT	Mesoscale Discussion	SPC	Beadle, Brookings, Brule, Buffalo, Butte, Clark and 25 more	2 hr
Aug 22, 2:31 PM CDT	Mesoscale Discussion	SPC	Union	119 min

Nearby

Mesoscale Discussions in Minnesota, 2025 Mesoscale Discussions in South Dakota, 2025 Every mesoscale discussion in 2025

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.