Alert archive / Minnesota / Mesoscale Discussions in 2015

Mesoscale Discussion 1536

July 25, 2015Lyon County, Osceola County, Iowa; 14 counties in Minnesota; 14 counties in South Dakota

The Storm Prediction Center issued this mesoscale discussion at Jul 25, 2015, 6:13 PM CDT for Lyon County, Osceola County, Iowa; 14 counties in Minnesota; 14 counties in South Dakota. It was in force for 3 hr.

The area

The outline as issued.

The facts

Issued: Jul 25, 2015, 6:13 PM CDT (23:13 UTC)
Expired: Jul 25, 2015, 8:45 PM CDT
In force: 3 hr
Issued by: the Storm Prediction Center
Chance of a watch: 60%

All 30 counties

Lyon County, IA, Osceola County, IA, Big Stone County, MN, Chippewa County, MN, Cottonwood County, MN, Lac qui Parle County, MN, Lincoln County, MN, Lyon County, MN, Murray County, MN, Nobles County, MN, Pipestone County, MN, Redwood County, MN, Renville County, MN, Rock County, MN, Swift County, MN, Yellow Medicine County, MN, Brookings County, SD, Deuel County, SD, Douglas County, SD, Grant County, SD, Hamlin County, SD, Hanson County, SD, Hutchinson County, SD, Lake County, SD, Lincoln County, SD, McCook County, SD, Miner County, SD, Minnehaha County, SD, Moody County, SD, Turner County, SD

The radar

The Sioux Falls radar (KFSD), 49 km from the middle of the area, began a volume at 23:13 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 453Jul 25, 9:30 PM CDT

The nearest sounding before it

Aberdeen, SD (KABR), launched 12:00Z, 11.2 hours before the alert went out and 170 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: 272 J/kg
Mixed-layer CIN: -256 J/kg
Mixed-layer LCL: 2141 m above ground
0-6 km bulk shear: 29 kt
0-1 km storm-relative helicity: 31 m²/s²
0-3 km storm-relative helicity: 143 m²/s²
Significant tornado parameter: 0.0
Supercell composite: -0.1

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
Jul 25, 12:33 AM CDT	Mesoscale Discussion	SPC	Adams, Decatur, Fremont, Mills, Montgomery, Page and 4 more	2 hr
Jul 25, 4:52 PM CDT	Mesoscale Discussion	SPC	Louisa	2 hr
Jul 25, 4:30 PM CDT	Mesoscale Discussion	SPC	Kittson, Marshall, Norman, Pennington, Polk, Red Lake and 1 more	3 hr
Jul 25, 7:47 AM CDT	Mesoscale Discussion	SPC	Brule, Gregory, Jones, Lyman, Mellette, Tripp	2 hr
Jul 25, 10:58 AM CDT	Mesoscale Discussion	SPC	Hanson, Hutchinson, Lake, McCook, Miner, Minnehaha and 1 more	92 min
Jul 25, 3:27 PM CDT	Mesoscale Discussion	SPC	Aurora, Beadle, Brule, Buffalo, Hand, Hughes and 8 more	2 hr
Jul 25, 4:03 PM CDT	Tornado Watch	SPC	Aurora, Beadle, Brookings, Brown, Brule, Buffalo and 33 more	7 hr
Jul 25, 5:22 PM CDT	Mesoscale Discussion	SPC	Bennett, Jackson, Oglala Lakota	2 hr
Jul 25, 5:58 PM CDT	Mesoscale Discussion	SPC	Beadle, Brown, Buffalo, Campbell, Dewey, Edmunds and 14 more	92 min

Nearby

Mesoscale Discussions in Minnesota, 2015 Mesoscale Discussions in South Dakota, 2015 Mesoscale Discussions in Iowa, 2015 Every mesoscale discussion in 2015

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.