Alert archive / North Dakota / Mesoscale Discussions in 2016

Mesoscale Discussion 1338

July 20, 201622 counties in North Dakota

The Storm Prediction Center issued this mesoscale discussion at Jul 20, 2016, 2:43 PM MDT for 22 counties in North Dakota. It was in force for 92 min.

The area

The outline as issued.

The facts

Issued: Jul 20, 2016, 2:43 PM MDT (20:43 UTC)
Expired: Jul 20, 2016, 4:15 PM MDT
In force: 92 min
Issued by: the Storm Prediction Center
Chance of a watch: 80%

All 22 counties

Adams County, ND, Benson County, ND, Bottineau County, ND, Burleigh County, ND, Emmons County, ND, Grant County, ND, Hettinger County, ND, Kidder County, ND, McHenry County, ND, McLean County, ND, Mercer County, ND, Morton County, ND, Oliver County, ND, Pierce County, ND, Renville County, ND, Rolette County, ND, Sheridan County, ND, Sioux County, ND, Stark County, ND, Towner County, ND, Ward County, ND, Wells County, ND

The radar

The Bismarck radar (KBIS), 47 km from the middle of the area, began a volume at 20:46 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.

The nearest sounding before it

Bismarck Municip, ND (KBIS), launched 12:00Z, 8.7 hours before the alert went out and 51 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: 2285 J/kg
Mixed-layer CIN: -286 J/kg
Mixed-layer LCL: 1417 m above ground
0-6 km bulk shear: 32 kt
0-1 km storm-relative helicity: 27 m²/s²
0-3 km storm-relative helicity: 205 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.3

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 19, 7:10 PM MDT	Mesoscale Discussion	SPC	Cass, Grand Forks, Steele, Traill	95 min
Jul 20, 3:01 PM MDT	Severe Thunderstorm Watch	SPC	Adams, Benson, Bottineau, Burke, Burleigh, Cavalier and 28 more	8 hr
Jul 20, 4:39 PM MDT	Tornado Watch	SPC	Benson, Bottineau, Cavalier, McHenry, Pierce, Ramsey and 4 more	5 hr
Jul 20, 4:43 PM MDT	Mesoscale Discussion	SPC	Benson, Bottineau, McHenry, Pierce, Renville, Rolette and 2 more	62 min

Nearby

Mesoscale Discussions in North 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.