Alert archive / Minnesota / Mesoscale Discussions in 2018

Mesoscale Discussion 1368

August 27, 2018Hubbard County, Itasca County, Saint Louis County, Minnesota

The Storm Prediction Center issued this mesoscale discussion at Aug 27, 2018, 2:04 AM CDT for Hubbard County, Itasca County, Saint Louis County, Minnesota. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued: Aug 27, 2018, 2:04 AM CDT (07:04 UTC)
Expired: Aug 27, 2018, 4:30 AM CDT
In force: 2 hr
Issued by: the Storm Prediction Center

Counties Hubbard County, MN, Itasca County, MN, Saint Louis County, MN

The radar

The Duluth radar (KDLH), 129 km from the middle of the area, began a volume at 07:07 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

International Fa, MN (KINL), launched 00:00Z, 7.1 hours before the alert went out and 89 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: 33 J/kg
Mixed-layer CIN: -321 J/kg
Mixed-layer LCL: 967 m above ground
0-6 km bulk shear: 59 kt
0-1 km storm-relative helicity: 100 m²/s²
0-3 km storm-relative helicity: 245 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 26, 7:37 PM CDT	Tornado Watch	SPC	Big Stone, Clay, Traverse, Wilkin	5 hr
Aug 26, 9:48 PM CDT	Severe Thunderstorm Watch	SPC	Becker, Beltrami, Cass, Clearwater, Hubbard, Itasca and 10 more	6 hr
Aug 26, 10:55 PM CDT	Mesoscale Discussion	SPC	Becker, Beltrami, Big Stone, Cass, Clay, Clearwater and 16 more	2 hr
Aug 27, 11:49 AM CDT	Mesoscale Discussion	SPC	Anoka, Blue Earth, Brown, Carver, Chippewa, Cottonwood and 27 more	116 min
Aug 27, 2:24 PM CDT	Mesoscale Discussion	SPC	Anoka, Blue Earth, Brown, Carver, Chisago, Cottonwood and 32 more	96 min
Aug 27, 2:57 PM CDT	Severe Thunderstorm Watch	SPC	Anoka, Benton, Blue Earth, Brown, Carlton, Carver and 38 more	7 hr

Nearby

Mesoscale Discussions in Minnesota, 2018 Every mesoscale discussion in 2018

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.