Alert archive / Minnesota / Mesoscale Discussions in 2017

Mesoscale Discussion 1334

July 17, 201718 counties in Minnesota; Burnett County, Douglas County, Washburn County, Wisconsin

The Storm Prediction Center issued this mesoscale discussion at Jul 17, 2017, 6:22 PM CDT for 18 counties in Minnesota; Burnett County, Douglas County, Washburn County, Wisconsin. It was in force for 53 min.

The area

The outline as issued.

The facts

Issued: Jul 17, 2017, 6:22 PM CDT (23:22 UTC)
Expired: Jul 17, 2017, 7:15 PM CDT
In force: 53 min
Issued by: the Storm Prediction Center

All 21 counties

Aitkin County, MN, Becker County, MN, Benton County, MN, Carlton County, MN, Cass County, MN, Crow Wing County, MN, Douglas County, MN, Grant County, MN, Hubbard County, MN, Kanabec County, MN, Mille Lacs County, MN, Morrison County, MN, Otter Tail County, MN, Pine County, MN, Pope County, MN, Stevens County, MN, Todd County, MN, Wadena County, MN, Burnett County, WI, Douglas County, WI, Washburn County, WI

The radar

The Duluth radar (KDLH), 165 km from the middle of the area, began a volume at 23:25 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, 11.4 hours before the alert went out and 203 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 1041 m above ground
0-6 km bulk shear: 27 kt
0-1 km storm-relative helicity: 140 m²/s²
0-3 km storm-relative helicity: 214 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
Jul 17, 2:57 PM CDT	Mesoscale Discussion	SPC	Aitkin, Becker, Benton, Big Stone, Carlton, Cass and 22 more	63 min
Jul 17, 3:21 PM CDT	Severe Thunderstorm Watch	SPC	Aitkin, Becker, Benton, Big Stone, Carlton, Cass and 23 more	7 hr
Jul 17, 6:41 PM CDT	Mesoscale Discussion	SPC	Aitkin, Becker, Benton, Carlton, Cass, Crow Wing and 12 more	2 hr

Nearby

Mesoscale Discussions in Minnesota, 2017 Mesoscale Discussions in Wisconsin, 2017 Every mesoscale discussion in 2017

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.