Alert archive / Minnesota / Mesoscale Discussions in 2016

Mesoscale Discussion 1608

August 29, 201620 counties in Minnesota; 12 counties in South Dakota

The Storm Prediction Center issued this mesoscale discussion at Aug 29, 2016, 3:35 PM CDT for 20 counties in Minnesota; 12 counties in South Dakota. It was in force for 115 min.

The area

The outline as issued.

The facts

Issued: Aug 29, 2016, 3:35 PM CDT (20:35 UTC)
Expired: Aug 29, 2016, 5:30 PM CDT
In force: 115 min
Issued by: the Storm Prediction Center
Chance of a watch: 20%

All 32 counties

Aitkin County, MN, Benton County, MN, Big Stone County, MN, Carlton County, MN, Cass County, MN, Chippewa County, MN, Crow Wing County, MN, Douglas County, MN, Grant County, MN, Kanabec County, MN, Lac qui Parle County, MN, Mille Lacs County, MN, Morrison County, MN, Pope County, MN, Stearns County, MN, Stevens County, MN, Swift County, MN, Todd County, MN, Traverse County, MN, Wadena County, MN, Beadle County, SD, Clark County, SD, Codington County, SD, Day County, SD, Deuel County, SD, Grant County, SD, Hamlin County, SD, Hand County, SD, Hyde County, SD, Kingsbury County, SD, Roberts County, SD, Spink County, SD

The radar

The Aberdeen radar (KABR), 156 km from the middle of the area, began a volume at 20:33 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

Minneapolis, MN (KMPX), launched 12:00Z, 8.6 hours before the alert went out and 230 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: 278 J/kg
Mixed-layer CIN: -225 J/kg
Mixed-layer LCL: 1423 m above ground
0-6 km bulk shear: 27 kt
0-1 km storm-relative helicity: 93 m²/s²
0-3 km storm-relative helicity: 86 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

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 28, 9:44 PM CDT	Mesoscale Discussion	SPC	Clearwater, Mahnomen, Norman, Polk, Red Lake	91 min

Nearby

Mesoscale Discussions in Minnesota, 2016 Mesoscale Discussions in South Dakota, 2016 Every mesoscale discussion in 2016

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.