Alert archive / North Dakota / Mesoscale Discussions in 2018

Mesoscale Discussion 929

June 28, 201813 counties in Montana; 28 counties in North Dakota; Corson County, Harding County, Perkins County, South Dakota

The Storm Prediction Center issued this mesoscale discussion at Jun 28, 2018, 5:59 PM MDT for 13 counties in Montana; 28 counties in North Dakota; Corson County, Harding County, Perkins County, South Dakota. It was in force for 91 min.

The area

The outline as issued.

The facts

Issued
Jun 28, 2018, 5:59 PM MDT (23:59 UTC)
Expired
Jun 28, 2018, 7:30 PM MDT
In force
91 min
Issued by
the Storm Prediction Center
All 44 counties

Big Horn County, MT, Carter County, MT, Custer County, MT, Dawson County, MT, Fallon County, MT, Garfield County, MT, McCone County, MT, Powder River County, MT, Prairie County, MT, Richland County, MT, Rosebud County, MT, Treasure County, MT, Wibaux County, MT, Adams County, ND, Benson County, ND, Billings County, ND, Bowman County, ND, Burleigh County, ND, Dunn County, ND, Emmons County, ND, Foster County, ND, Golden Valley County, ND, Grant County, ND, Hettinger County, ND, Kidder County, ND, Logan County, ND, McHenry County, ND, McKenzie County, ND, McLean County, ND, Mercer County, ND, Morton County, ND, Mountrail County, ND, Oliver County, ND, Pierce County, ND, Sheridan County, ND, Sioux County, ND, Slope County, ND, Stark County, ND, Ward County, ND, Wells County, ND, Williams County, ND, Corson County, SD, Harding County, SD, Perkins County, SD

The radar

The Bismarck radar (KBIS), 192 km from the middle of the area, began a volume at 00:01 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, 12.0 hours before the alert went out and 197 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-pSkew-T log-p diagram, Bismarck Municip, ND at 12:00Z on 2018-06-28Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1855 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Bismarck Municip, ND at 12:00Z on 2018-06-28The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 90 square meters per square second.19395878Sfc1 km3 km6 km9 kmRMLM
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
1855 J/kg
Mixed-layer CIN
-101 J/kg
Mixed-layer LCL
945 m above ground
0-6 km bulk shear
52 kt
0-1 km storm-relative helicity
90 m²/s²
0-3 km storm-relative helicity
86 m²/s²
Significant tornado parameter
0.0
Supercell composite
1.1

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.

IssuedProductOfficeCountiesLasted
Jun 28, 2:35 PM MDTMesoscale DiscussionSPCBig Horn, Carter, Custer, Dawson, Fallon, Garfield and 7 more2 hr
Jun 28, 3:42 PM MDTTornado WatchSPCCarter, Custer, Dawson, Fallon, Garfield, McCone and 6 more7 hr
Jun 28, 2:52 AM MDTMesoscale DiscussionSPCBarnes, Burleigh, Cass, Dickey, Emmons, Foster and 12 more83 min
Jun 28, 6:40 AM MDTMesoscale DiscussionSPCAdams, Barnes, Burleigh, Cass, Dickey, Emmons and 18 more3 hr
Jun 28, 12:06 PM MDTMesoscale DiscussionSPCBenson, Burleigh, Eddy, Foster, Grand Forks, Griggs and 8 more114 min
Jun 28, 12:33 PM MDTSevere Thunderstorm WatchSPCCass, Grand Forks, Steele, Traill6 hr
Jun 28, 2:16 PM MDTTornado WatchSPCAdams, Barnes, Benson, Billings, Bowman, Burleigh and 31 more8 hr
Jun 28, 2:53 PM MDTMesoscale DiscussionSPCCass, Grand Forks, Steele, Traill97 min
Jun 28, 4:23 PM MDTMesoscale DiscussionSPCGrand Forks, Traill97 min
Jun 28, 5:10 PM MDTMesoscale DiscussionSPCBennett, Jackson, Mellette, Oglala Lakota, Todd2 hr

Nearby

Mesoscale Discussions in North Dakota, 2018Mesoscale Discussions in Montana, 2018Mesoscale Discussions in South Dakota, 2018Every 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.