Alert archive / Nebraska / Mesoscale Discussions in 2015

Mesoscale Discussion 918

June 6, 20154 states

The Storm Prediction Center issued this mesoscale discussion at Jun 6, 2015, 8:11 PM CDT for 4 states. It was in force for 64 min.

The area

The outline as issued.

The facts

Issued
Jun 6, 2015, 8:11 PM CDT (01:11 UTC)
Expired
Jun 6, 2015, 9:15 PM CDT
In force
64 min
Issued by
the Storm Prediction Center
All 51 counties

Cherokee County, IA, Ida County, IA, Lyon County, IA, Monona County, IA, O'Brien County, IA, Osceola County, IA, Plymouth County, IA, Sioux County, IA, Woodbury County, IA, Nobles County, MN, Pipestone County, MN, Rock County, MN, Antelope County, NE, Boone County, NE, Boyd County, NE, Burt County, NE, Butler County, NE, Cedar County, NE, Colfax County, NE, Cuming County, NE, Dakota County, NE, Dixon County, NE, Dodge County, NE, Greeley County, NE, Holt County, NE, Knox County, NE, Madison County, NE, Nance County, NE, Pierce County, NE, Platte County, NE, Polk County, NE, Stanton County, NE, Thurston County, NE, Washington County, NE, Wayne County, NE, Wheeler County, NE, Bon Homme County, SD, Charles Mix County, SD, Clay County, SD, Douglas County, SD, Hanson County, SD, Hutchinson County, SD, Lake County, SD, Lincoln County, SD, McCook County, SD, Miner County, SD, Minnehaha County, SD, Moody County, SD, Turner County, SD, Union County, SD, Yankton County, SD

The radar

The Sioux Falls radar (KFSD), 96 km from the middle of the area, began a volume at 01:12 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

Omaha, NE (KOAX), launched 00:00Z, 1.2 hours before the alert went out and 175 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, Omaha, NE at 00:00Z on 2015-06-07Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1554 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, Omaha, NE at 00:00Z on 2015-06-07The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 184 square meters per square second.193958Sfc1 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
1554 J/kg
Mixed-layer CIN
-63 J/kg
Mixed-layer LCL
1214 m above ground
0-6 km bulk shear
25 kt
0-1 km storm-relative helicity
184 m²/s²
0-3 km storm-relative helicity
388 m²/s²
Significant tornado parameter
0.9
Supercell composite
13.1

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 6, 8:45 PM CDTTornado WatchSPCBuena Vista, Cherokee, Clay, Dickinson, Ida, Lyon and 6 more4 hr
Jun 6, 11:00 PM CDTMesoscale DiscussionSPCBuena Vista, Calhoun, Carroll, Cherokee, Clay, Crawford and 14 more2 hr
Jun 6, 11:23 PM CDTSevere Thunderstorm WatchSPCAdair, Audubon, Black Hawk, Boone, Bremer, Butler and 32 more6 hr
Jun 7, 1:56 AM CDTMesoscale DiscussionSPCAdair, Adams, Benton, Black Hawk, Bremer, Buchanan and 29 more2 hr
Jun 7, 1:52 PM CDTMesoscale DiscussionSPCAppanoose, Davis, Des Moines, Henry, Jefferson, Keokuk and 9 more53 min
Jun 7, 3:33 PM CDTSevere Thunderstorm WatchSPCAppanoose, Clarke, Davis, Decatur, Des Moines, Henry and 10 more4 hr
Jun 7, 6:21 PM CDTMesoscale DiscussionSPCDavis, Des Moines, Henry, Jefferson, Lee, Van Buren84 min
Jun 6, 7:44 PM CDTMesoscale DiscussionSPCBecker, Big Stone, Chippewa, Clay, Douglas, Grant and 11 more91 min
Jun 6, 10:24 PM CDTMesoscale DiscussionSPCChippewa, Kandiyohi, Lac qui Parle, Meeker, Morrison, Pope and 3 more66 min
Jun 6, 7:55 PM CDTMesoscale DiscussionSPCChase, Dundy, Frontier, Hayes, Hitchcock, Perkins and 1 more95 min
Jun 6, 10:33 PM CDTMesoscale DiscussionSPCChase, Dawson, Dundy, Frontier, Furnas, Gosper and 5 more57 min
Jun 7, 2:36 PM CDTMesoscale DiscussionSPCChase, Dundy, Hayes, Hitchcock, Perkins114 min
Jun 7, 5:31 PM CDTMesoscale DiscussionSPCRichardson89 min

Nearby

Mesoscale Discussions in Nebraska, 2015Mesoscale Discussions in South Dakota, 2015Mesoscale Discussions in Iowa, 2015Every 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.