Alert archive / Nebraska / Mesoscale Discussions in 2004

Mesoscale Discussion 1827

August 2, 20044 states

The Storm Prediction Center issued this mesoscale discussion at Aug 2, 2004, 3:02 AM CDT for 4 states. It was in force for 58 min.

The area

The outline as issued.

The facts

Issued
Aug 2, 2004, 3:02 AM CDT (08:02 UTC)
Expired
Aug 2, 2004, 4:00 AM CDT
In force
58 min
Issued by
the Storm Prediction Center
All 33 counties

Buena Vista County, IA, Cherokee County, IA, Ida County, IA, Lyon County, IA, O'Brien County, IA, Osceola County, IA, Plymouth County, IA, Sac County, IA, Sioux County, IA, Woodbury County, IA, Murray County, MN, Nobles County, MN, Rock County, MN, Antelope County, NE, Burt County, NE, Cedar County, NE, Cuming County, NE, Dakota County, NE, Dixon County, NE, Holt County, NE, Knox County, NE, Madison County, NE, Pierce County, NE, Stanton County, NE, Thurston County, NE, Wayne County, NE, Wheeler County, NE, Bon Homme County, SD, Clay County, SD, Lincoln 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 08:04 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 00:00Z, 8.0 hours before the alert went out and 170 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 2004-08-02Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 5168 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 2004-08-02The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 139 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
5168 J/kg
Mixed-layer CIN
-53 J/kg
Mixed-layer LCL
975 m above ground
0-6 km bulk shear
49 kt
0-1 km storm-relative helicity
139 m²/s²
0-3 km storm-relative helicity
252 m²/s²
Significant tornado parameter
8.0
Supercell composite
27.6

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
Aug 2, 12:20 AM CDTSevere Thunderstorm WatchSPCBuena Vista, Cherokee, Ida, Lyon, O'Brien, Osceola and 4 more4 hr
Aug 2, 4:56 AM CDTMesoscale DiscussionSPCAdair, Adams, Appanoose, Audubon, Benton, Black Hawk and 50 more94 min
Aug 1, 7:22 PM CDTMesoscale DiscussionSPCBig Stone, Lac qui Parle, Lincoln, Swift53 min
Aug 2, 12:53 AM CDTMesoscale DiscussionSPCBecker, Beltrami, Cass, Clay, Clearwater, Hubbard and 12 more97 min
Aug 2, 3:00 AM CDTSevere Thunderstorm WatchSPCAnoka, Becker, Benton, Clay, Douglas, Grant and 14 more5 hr
Aug 2, 5:17 AM CDTMesoscale DiscussionSPCAnoka, Becker, Benton, Clay, Douglas, Grant and 14 more88 min
Aug 2, 6:41 AM CDTMesoscale DiscussionSPCAnoka, Becker, Benton, Clay, Douglas, Grant and 14 more64 min
Aug 2, 3:12 PM CDTMesoscale DiscussionSPCBlue Earth, Brown, Cottonwood, Dodge, Faribault, Freeborn and 18 more2 hr
Aug 2, 3:50 PM CDTSevere Thunderstorm WatchSPCBlue Earth, Brown, Cottonwood, Faribault, Freeborn, Jackson and 14 more5 hr
Aug 1, 10:35 PM CDTSevere Thunderstorm WatchSPCAntelope, Boyd, Burt, Cedar, Cuming, Dakota and 9 more5 hr
Aug 2, 4:23 PM CDTMesoscale DiscussionSPCAntelope, Boyd, Brown, Cedar, Cherry, Dixon and 7 more37 min
Aug 2, 4:55 PM CDTSevere Thunderstorm WatchSPCAntelope, Blaine, Boone, Brown, Cedar, Colfax and 15 more5 hr
Aug 1, 7:45 PM CDTTornado WatchSPCBeadle, Brookings, Brown, Buffalo, Campbell, Clark and 26 more6 hr
Aug 1, 10:00 PM CDTMesoscale DiscussionSPCBeadle, Buffalo, Campbell, Edmunds, Faulk, Hand and 7 more60 min
Aug 1, 11:29 PM CDTMesoscale DiscussionSPCAurora, Beadle, Bon Homme, Brule, Buffalo, Charles Mix and 19 more61 min
Aug 2, 6:30 PM CDTSevere Thunderstorm WatchSPCAurora, Bennett, Bon Homme, Brule, Buffalo, Charles Mix and 17 more6 hr

Nearby

Mesoscale Discussions in Nebraska, 2004Mesoscale Discussions in Iowa, 2004Mesoscale Discussions in South Dakota, 2004Every mesoscale discussion in 2004

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.