Alert archive / North Dakota / Mesoscale Discussions in 2014

Mesoscale Discussion 1563

August 17, 201415 counties in North Dakota

The Storm Prediction Center issued this mesoscale discussion at Aug 17, 2014, 1:20 PM MDT for 15 counties in North Dakota. It was in force for 85 min.

The area

The outline as issued.

The facts

Issued: Aug 17, 2014, 1:20 PM MDT (19:20 UTC)
Expired: Aug 17, 2014, 2:45 PM MDT
In force: 85 min
Issued by: the Storm Prediction Center
Chance of a watch: 40%

Counties Adams County, ND, Bottineau County, ND, Bowman County, ND, Dunn County, ND, Grant County, ND, Hettinger County, ND, McHenry County, ND, McLean County, ND, Mercer County, ND, Morton County, ND, Oliver County, ND, Renville County, ND, Slope County, ND, Stark County, ND, Ward County, ND

The radar

The Bismarck radar (KBIS), 103 km from the middle of the area, began a volume at 19:23 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 463Aug 17, 2:55 PM MDT

The nearest sounding before it

Bismarck Municip, ND (KBIS), launched 12:00Z, 7.3 hours before the alert went out and 107 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: 154 J/kg
Mixed-layer CIN: -73 J/kg
Mixed-layer LCL: 634 m above ground
0-6 km bulk shear: 21 kt
0-1 km storm-relative helicity: 57 m²/s²
0-3 km storm-relative helicity: 129 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.5

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
Aug 17, 2:52 PM MDT	Severe Thunderstorm Watch	SPC	Adams, Benson, Bottineau, Burleigh, Cavalier, Eddy and 21 more	6 hr
Aug 17, 5:39 PM MDT	Mesoscale Discussion	SPC	Benson, Burleigh, Cavalier, Eddy, Emmons, Foster and 11 more	66 min

Nearby

Mesoscale Discussions in North Dakota, 2014 Every mesoscale discussion in 2014

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.