Alert archive / Montana / Mesoscale Discussions in 2014

Mesoscale Discussion 1453

July 23, 20144 counties in Montana; Harding County, South Dakota; Crook County, Wyoming

The Storm Prediction Center issued this mesoscale discussion at Jul 23, 2014, 8:28 PM MDT for 4 counties in Montana; Harding County, South Dakota; Crook County, Wyoming. It was in force for 92 min.

The area

The outline as issued.

The facts

Issued
Jul 23, 2014, 8:28 PM MDT (02:28 UTC)
Expired
Jul 23, 2014, 10:00 PM MDT
In force
92 min
Issued by
the Storm Prediction Center
Chance of a watch
20%

Counties Carter County, MT, Custer County, MT, Fallon County, MT, Powder River County, MT, Harding County, SD, Crook County, WY

The radar

The Rapid City radar (KUDX), 235 km from the middle of the area, began a volume at 02:30 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

Glasgow Intl Airport, MT (KGGW), launched 00:00Z, 2.5 hours before the alert went out and 320 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, Glasgow Intl Airport, MT at 00:00Z on 2014-07-24Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 987 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, Glasgow Intl Airport, MT at 00:00Z on 2014-07-24The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 53 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
987 J/kg
Mixed-layer CIN
-98 J/kg
Mixed-layer LCL
2178 m above ground
0-6 km bulk shear
67 kt
0-1 km storm-relative helicity
53 m²/s²
0-3 km storm-relative helicity
252 m²/s²
Significant tornado parameter
0.0
Supercell composite
7.0

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
Jul 23, 6:58 PM MDTMesoscale DiscussionSPCFlathead, Granite, Lake, Lincoln, Mineral, Missoula and 2 more92 min
Jul 23, 7:52 PM MDTMesoscale DiscussionSPCBlaine, Cascade, Chouteau, Fergus, Garfield, Golden Valley and 12 more113 min
Jul 23, 8:31 PM MDTSevere Thunderstorm WatchSPCBlaine, Broadwater, Cascade, Chouteau, Fergus, Garfield and 13 more6 hr
Jul 23, 10:52 PM MDTMesoscale DiscussionSPCCarter, Custer, Fallon, Powder River83 min
Jul 24, 1:41 AM MDTMesoscale DiscussionSPCDaniels, Garfield, McCone, Phillips, Richland, Roosevelt and 2 more2 hr
Jul 24, 2:27 AM MDTSevere Thunderstorm WatchSPCDaniels, Dawson, McCone, Prairie, Richland, Roosevelt and 2 more6 hr
Jul 24, 1:50 PM MDTMesoscale DiscussionSPCBlaine, Daniels, Dawson, Fergus, Garfield, Hill and 7 more55 min
Jul 24, 2:54 PM MDTSevere Thunderstorm WatchSPCDaniels, Dawson, Garfield, McCone, Phillips, Richland and 4 more6 hr
Jul 24, 3:07 PM MDTMesoscale DiscussionSPCBig Horn, Carter, Custer, Fallon, Powder River, Rosebud and 1 more53 min
Jul 24, 4:53 PM MDTMesoscale DiscussionSPCCarter, Custer, Daniels, Dawson, Fallon, Garfield and 9 more97 min
Jul 24, 10:06 AM MDTMesoscale DiscussionSPCBrookings, Clark, Codington, Day, Deuel, Grant and 8 more84 min
Jul 24, 3:45 PM MDTMesoscale DiscussionSPCBennett, Haakon, Jackson, Jones, Mellette, Oglala Lakota and 3 more3 hr

Nearby

Mesoscale Discussions in Montana, 2014Mesoscale Discussions in South Dakota, 2014Mesoscale Discussions in Wyoming, 2014Every 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.