Alert archive / Nebraska / Mesoscale Discussions in 2015

Mesoscale Discussion 912

June 6, 20154 states

The Storm Prediction Center issued this mesoscale discussion at Jun 6, 2015, 2:32 PM CDT for 4 states. It was in force for 88 min.

The area

The outline as issued.

The facts

Issued: Jun 6, 2015, 2:32 PM CDT (19:32 UTC)
Expired: Jun 6, 2015, 4:00 PM CDT
In force: 88 min
Issued by: the Storm Prediction Center
Chance of a watch: 80%

All 60 counties

Cherokee County, IA, Lyon County, IA, Monona County, IA, Plymouth County, IA, Sioux County, IA, Woodbury County, IA, Rock County, MN, Antelope County, NE, Boone County, NE, Boyd County, NE, Burt County, NE, Cedar County, NE, Colfax County, NE, Cuming County, NE, Dakota County, NE, Dixon County, NE, Dodge County, NE, Garfield County, NE, Greeley County, NE, Holt County, NE, Howard County, NE, Keya Paha County, NE, Knox County, NE, Loup County, NE, Madison County, NE, Merrick County, NE, Nance County, NE, Pierce County, NE, Platte County, NE, Rock County, NE, Sherman County, NE, Stanton County, NE, Thurston County, NE, Valley County, NE, Wayne County, NE, Wheeler County, NE, Aurora County, SD, Beadle County, SD, Bon Homme County, SD, Brule County, SD, Buffalo County, SD, Charles Mix County, SD, Clay County, SD, Davison County, SD, Douglas County, SD, Gregory County, SD, Hanson County, SD, Hutchinson County, SD, Jerauld County, SD, Kingsbury County, SD, Lake County, SD, Lincoln County, SD, McCook County, SD, Miner County, SD, Minnehaha County, SD, Moody County, SD, Sanborn County, SD, Turner County, SD, Union County, SD, Yankton County, SD

The radar

The Sioux Falls radar (KFSD), 130 km from the middle of the area, began a volume at 19:32 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.

Tornado Watch 262Jun 6, 3:40 PM CDT

The nearest sounding before it

Aberdeen, SD (KABR), launched 12:00Z, 7.5 hours before the alert went out and 223 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: 42 J/kg
Mixed-layer CIN: -168 J/kg
Mixed-layer LCL: 1110 m above ground
0-6 km bulk shear: 23 kt
0-1 km storm-relative helicity: 29 m²/s²
0-3 km storm-relative helicity: 63 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.

Issued	Product	Office	Counties	Lasted
Jun 6, 3:40 PM CDT	Tornado Watch	SPC	Lyon, Plymouth, Sioux, Woodbury	5 hr
Jun 6, 6:34 PM CDT	Mesoscale Discussion	SPC	Lyon, Plymouth, Sioux	116 min
Jun 6, 3:05 PM CDT	Mesoscale Discussion	SPC	Big Stone, Clay, Grant, Norman, Traverse, Wilkin	85 min
Jun 6, 5:05 PM CDT	Severe Thunderstorm Watch	SPC	Becker, Big Stone, Chippewa, Clay, Douglas, Grant and 14 more	6 hr
Jun 5, 10:32 PM CDT	Mesoscale Discussion	SPC	Box Butte, Dawes, Sioux	58 min
Jun 6, 3:14 PM CDT	Mesoscale Discussion	SPC	Chase, Deuel, Dundy, Perkins	91 min
Jun 6, 5:25 PM CDT	Severe Thunderstorm Watch	SPC	Chase, Dundy, Frontier, Hayes, Hitchcock, Lincoln and 2 more	5 hr

Nearby

Mesoscale Discussions in Nebraska, 2015 Mesoscale Discussions in South Dakota, 2015 Mesoscale Discussions in Iowa, 2015 Every mesoscale discussion in 2015

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.