Alert archive / Nebraska / Mesoscale Discussions in 2014

Mesoscale Discussion 857

June 6, 20146 counties in Nebraska; Bennett County, Mellette County, Todd County, South Dakota

The Storm Prediction Center issued this mesoscale discussion at Jun 6, 2014, 12:11 PM MDT for 6 counties in Nebraska; Bennett County, Mellette County, Todd County, South Dakota. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued: Jun 6, 2014, 12:11 PM MDT (18:11 UTC)
Expired: Jun 6, 2014, 2:15 PM MDT
In force: 2 hr
Issued by: the Storm Prediction Center
Chance of a watch: 40%

Counties Cherry County, NE, Cheyenne County, NE, Garden County, NE, Grant County, NE, Morrill County, NE, Sheridan County, NE, Bennett County, SD, Mellette County, SD, Todd County, SD

The radar

The North Platte radar (KLNX), 122 km from the middle of the area, began a volume at 18:11 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 242Jun 6, 12:50 PM MDT

The nearest sounding before it

N. Platte/Lee Bi, NE (KLBF), launched 12:00Z, 6.2 hours before the alert went out and 180 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: 698 J/kg
Mixed-layer CIN: -159 J/kg
Mixed-layer LCL: 1180 m above ground
0-6 km bulk shear: 27 kt
0-1 km storm-relative helicity: 15 m²/s²
0-3 km storm-relative helicity: 59 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 3.0

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.

Issued	Product	Office	Counties	Lasted
Jun 6, 12:49 PM MDT	Severe Thunderstorm Watch	SPC	Arthur, Banner, Chase, Cherry, Cheyenne, Custer and 15 more	7 hr
Jun 6, 2:32 PM MDT	Mesoscale Discussion	SPC	Arthur, Cherry, Cheyenne, Deuel, Garden, Grant and 5 more	58 min
Jun 6, 3:03 PM MDT	Mesoscale Discussion	SPC	Red Willow	117 min
Jun 6, 4:33 PM MDT	Severe Thunderstorm Watch	SPC	Dundy, Hitchcock, Red Willow	7 hr
Jun 6, 5:13 PM MDT	Mesoscale Discussion	SPC	Buffalo, Chase, Custer, Dawson, Dundy, Franklin and 13 more	2 hr

Nearby

Mesoscale Discussions in Nebraska, 2014 Mesoscale Discussions in South 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.