Alert archive / Nebraska / Mesoscale Discussions in 2013

Mesoscale Discussion 852

May 29, 201339 counties in Iowa; 48 counties in Nebraska; Clay County, Union County, South Dakota

The Storm Prediction Center issued this mesoscale discussion at May 29, 2013, 8:54 AM CDT for 39 counties in Iowa; 48 counties in Nebraska; Clay County, Union County, South Dakota. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued
May 29, 2013, 8:54 AM CDT (13:54 UTC)
Expired
May 29, 2013, 11:00 AM CDT
In force
2 hr
Issued by
the Storm Prediction Center
Chance of a watch
40%
All 89 counties

Adair County, IA, Adams County, IA, Audubon County, IA, Boone County, IA, Buena Vista County, IA, Calhoun County, IA, Carroll County, IA, Cass County, IA, Cherokee County, IA, Clay County, IA, Crawford County, IA, Dallas County, IA, Emmet County, IA, Fremont County, IA, Greene County, IA, Guthrie County, IA, Hamilton County, IA, Harrison County, IA, Humboldt County, IA, Ida County, IA, Kossuth County, IA, Madison County, IA, Mills County, IA, Monona County, IA, Montgomery County, IA, O'Brien County, IA, Palo Alto County, IA, Plymouth County, IA, Pocahontas County, IA, Polk County, IA, Pottawattamie County, IA, Sac County, IA, Shelby County, IA, Sioux County, IA, Story County, IA, Union County, IA, Webster County, IA, Woodbury County, IA, Wright County, IA, Adams County, NE, Antelope County, NE, Boone County, NE, Buffalo County, NE, Burt County, NE, Butler County, NE, Cass County, NE, Cedar County, NE, Clay County, NE, Colfax County, NE, Cuming County, NE, Dakota County, NE, Dixon County, NE, Dodge County, NE, Douglas County, NE, Fillmore County, NE, Franklin County, NE, Garfield County, NE, Greeley County, NE, Hall County, NE, Hamilton County, NE, Harlan County, NE, Howard County, NE, Kearney County, NE, Knox County, NE, Lancaster County, NE, Madison County, NE, Merrick County, NE, Nance County, NE, Nuckolls County, NE, Otoe County, NE, Phelps County, NE, Pierce County, NE, Platte County, NE, Polk County, NE, Saline County, NE, Sarpy County, NE, Saunders County, NE, Seward County, NE, Sherman County, NE, Stanton County, NE, Thurston County, NE, Valley County, NE, Washington County, NE, Wayne County, NE, Webster County, NE, Wheeler County, NE, York County, NE, Clay County, SD, Union County, SD

The radar

The Omaha radar (KOAX), 43 km from the middle of the area, began a volume at 13:57 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

Omaha, NE (KOAX), launched 12:00Z, 1.9 hours before the alert went out and 43 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 12:00Z on 2013-05-29Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1537 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 12:00Z on 2013-05-29The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 124 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
1537 J/kg
Mixed-layer CIN
-93 J/kg
Mixed-layer LCL
544 m above ground
0-6 km bulk shear
11 kt
0-1 km storm-relative helicity
124 m²/s²
0-3 km storm-relative helicity
137 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
May 28, 9:20 PM CDTMesoscale DiscussionSPCAdams, Appanoose, Clarke, Davis, Decatur, Fremont and 10 more55 min
May 29, 2:39 PM CDTMesoscale DiscussionSPCAllamakee, Benton, Black Hawk, Bremer, Buchanan, Chickasaw and 19 more66 min
May 29, 2:56 PM CDTSevere Thunderstorm WatchSPCAllamakee, Appanoose, Benton, Black Hawk, Bremer, Buchanan and 29 more7 hr
May 29, 3:33 PM CDTTornado WatchSPCFremont, Mills7 hr
May 29, 5:54 PM CDTMesoscale DiscussionSPCAllamakee, Appanoose, Benton, Black Hawk, Bremer, Buchanan and 32 more66 min
May 29, 6:24 PM CDTTornado WatchSPCAdams, Audubon, Buena Vista, Carroll, Cass, Cherokee and 20 more4 hr
May 28, 7:52 PM CDTMesoscale DiscussionSPCArthur, Banner, Blaine, Box Butte, Boyd, Brown and 40 more113 min
May 29, 12:57 AM CDTSevere Thunderstorm WatchSPCBlaine, Custer, Hooker, Lincoln, Logan, Loup and 2 more3 hr
May 29, 12:52 PM CDTMesoscale DiscussionSPCBuffalo, Chase, Custer, Dawson, Dundy, Franklin and 14 more53 min
May 29, 1:04 PM CDTTornado WatchSPCAdams, Arthur, Blaine, Buffalo, Chase, Clay and 38 more9 hr
May 29, 3:12 PM CDTMesoscale DiscussionSPCButler, Cass, Fillmore, Gage, Hamilton, Jefferson and 12 more2 hr
May 29, 3:24 PM CDTMesoscale DiscussionSPCAdams, Arthur, Boone, Buffalo, Chase, Clay and 27 more66 min
May 29, 5:18 PM CDTMesoscale DiscussionSPCBurt, Cedar, Colfax, Cuming, Dakota, Dixon and 10 more87 min

Nearby

Mesoscale Discussions in Nebraska, 2013Mesoscale Discussions in Iowa, 2013Mesoscale Discussions in South Dakota, 2013Every mesoscale discussion in 2013

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.