Alert archive / North Dakota / Mesoscale Discussions in 2007

Mesoscale Discussion 1239

June 21, 2007Richland County, Wibaux County, Montana; 9 counties in North Dakota; 6 counties in South Dakota

The Storm Prediction Center issued this mesoscale discussion at Jun 21, 2007, 1:43 PM MDT for Richland County, Wibaux County, Montana; 9 counties in North Dakota; 6 counties in South Dakota. It was in force for 92 min.

The area

The outline as issued.

The facts

Issued
Jun 21, 2007, 1:43 PM MDT (19:43 UTC)
Expired
Jun 21, 2007, 3:15 PM MDT
In force
92 min
Issued by
the Storm Prediction Center

Counties Richland County, MT, Wibaux County, MT, Adams County, ND, Billings County, ND, Bowman County, ND, Golden Valley County, ND, Grant County, ND, Hettinger County, ND, Sioux County, ND, Slope County, ND, Stark County, ND, Corson County, SD, Dewey County, SD, Harding County, SD, Meade County, SD, Perkins County, SD, Ziebach County, SD

The radar

The Bismarck radar (KBIS), 162 km from the middle of the area, began a volume at 19:45 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, 7.7 hours before the alert went out and 166 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 2007-06-21Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 62 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 2007-06-21The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -10 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
62 J/kg
Mixed-layer CIN
-338 J/kg
Mixed-layer LCL
1961 m above ground
0-6 km bulk shear
55 kt
0-1 km storm-relative helicity
-10 m²/s²
0-3 km storm-relative helicity
64 m²/s²
Significant tornado parameter
0.0
Supercell composite
-0.0

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.

IssuedProductOfficeCountiesLasted
Jun 20, 6:38 PM MDTMesoscale DiscussionSPCBeaverhead, Broadwater, Carbon, Cascade, Chouteau, Deer Lodge and 19 more67 min
Jun 20, 8:38 PM MDTMesoscale DiscussionSPCBroadwater, Cascade, Chouteau, Deer Lodge, Fergus, Gallatin and 16 more67 min
Jun 21, 1:10 AM MDTMesoscale DiscussionSPCAdams, Dickey, Emmons, Grant, LaMoure, Logan and 3 more95 min
Jun 21, 1:29 AM MDTSevere Thunderstorm WatchSPCAdams, Bowman, Burleigh, Dickey, Emmons, Grant and 13 more8 hr
Jun 21, 4:34 AM MDTMesoscale DiscussionSPCAdams, Dickey, Emmons, Grant, Hettinger, McIntosh and 3 more86 min
Jun 21, 2:55 AM MDTMesoscale DiscussionSPCCodington, Deuel, Grant, Roberts95 min
Jun 21, 6:14 AM MDTMesoscale DiscussionSPCBrookings, Brown, Campbell, Clark, Codington, Day and 11 more91 min
Jun 21, 8:10 AM MDTMesoscale DiscussionSPCAurora, Beadle, Bon Homme, Brookings, Brule, Buffalo and 19 more35 min
Jun 21, 8:38 AM MDTSevere Thunderstorm WatchSPCAurora, Beadle, Bon Homme, Brookings, Brule, Charles Mix and 18 more6 hr
Jun 21, 1:13 PM MDTMesoscale DiscussionSPCAurora, Beadle, Bon Homme, Brookings, Brule, Buffalo and 22 more62 min
Jun 21, 2:15 PM MDTMesoscale DiscussionSPCAurora, Beadle, Bon Homme, Brookings, Brule, Buffalo and 19 more30 min
Jun 21, 3:37 PM MDTTornado WatchSPCBennett, Butte, Custer, Dewey, Fall River, Haakon and 12 more7 hr

Nearby

Mesoscale Discussions in North Dakota, 2007Mesoscale Discussions in South Dakota, 2007Mesoscale Discussions in Montana, 2007Every mesoscale discussion in 2007

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.