Alert archive / Iowa / Mesoscale Discussions in 2004

Mesoscale Discussion 823

May 22, 200435 counties in Iowa; 8 counties in Missouri; 28 counties in Nebraska

The Storm Prediction Center issued this mesoscale discussion at May 22, 2004, 3:02 PM CDT for 35 counties in Iowa; 8 counties in Missouri; 28 counties in Nebraska. It was in force for 58 min.

The area

The outline as issued.

The facts

Issued
May 22, 2004, 3:02 PM CDT (20:02 UTC)
Expired
May 22, 2004, 4:00 PM CDT
In force
58 min
Issued by
the Storm Prediction Center
All 71 counties

Adair County, IA, Adams County, IA, Appanoose County, IA, Audubon County, IA, Cass County, IA, Clarke County, IA, Dallas County, IA, Davis County, IA, Decatur County, IA, Fremont County, IA, Guthrie County, IA, Harrison County, IA, Iowa County, IA, Jasper County, IA, Jefferson County, IA, Keokuk County, IA, Lucas County, IA, Madison County, IA, Mahaska County, IA, Marion County, IA, Mills County, IA, Monroe County, IA, Montgomery County, IA, Page County, IA, Polk County, IA, Pottawattamie County, IA, Poweshiek County, IA, Ringgold County, IA, Shelby County, IA, Taylor County, IA, Union County, IA, Van Buren County, IA, Wapello County, IA, Warren County, IA, Wayne County, IA, Atchison County, MO, Harrison County, MO, Mercer County, MO, Nodaway County, MO, Putnam County, MO, Schuyler County, MO, Scotland County, MO, Worth County, MO, Adams County, NE, Butler County, NE, Cass County, NE, Clay County, NE, Douglas County, NE, Fillmore County, NE, Franklin County, NE, Gage County, NE, Hall County, NE, Hamilton County, NE, Jefferson County, NE, Johnson County, NE, Kearney County, NE, Lancaster County, NE, Merrick County, NE, Nemaha County, NE, Nuckolls County, NE, Otoe County, NE, Pawnee County, NE, Polk County, NE, Saline County, NE, Sarpy County, NE, Saunders County, NE, Seward County, NE, Thayer County, NE, Washington County, NE, Webster County, NE, York County, NE

The radar

The Omaha radar (KOAX), 63 km from the middle of the area, began a volume at 20:06 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 12:00Z, 8.0 hours before the alert went out and 63 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 2004-05-22Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 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 2004-05-22The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -293 square meters per square second.19395878Sfc1 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
1886 m above ground
0-6 km bulk shear
56 kt
0-1 km storm-relative helicity
-293 m²/s²
0-3 km storm-relative helicity
-132 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 21, 7:37 PM CDTMesoscale DiscussionSPCAudubon, Benton, Black Hawk, Boone, Bremer, Buchanan and 48 more83 min
May 21, 9:55 PM CDTTornado WatchSPCAudubon, Boone, Buena Vista, Calhoun, Carroll, Cherokee and 14 more4 hr
May 22, 12:05 AM CDTSevere Thunderstorm WatchSPCBenton, Black Hawk, Bremer, Buchanan, Butler, Cedar and 26 more6 hr
May 22, 12:25 AM CDTMesoscale DiscussionSPCAudubon, Boone, Buena Vista, Calhoun, Carroll, Cherokee and 14 more2 hr
May 22, 12:55 AM CDTSevere Thunderstorm WatchSPCAdair, Adams, Audubon, Boone, Carroll, Cass and 17 more5 hr
May 22, 2:41 AM CDTMesoscale DiscussionSPCBenton, Black Hawk, Buchanan, Cedar, Clayton, Clinton and 24 more94 min
May 22, 3:44 AM CDTMesoscale DiscussionSPCAdair, Adams, Audubon, Boone, Cass, Dallas and 11 more61 min
May 22, 6:58 AM CDTMesoscale DiscussionSPCAppanoose, Davis, Decatur, Des Moines, Henry, Jefferson and 6 more62 min
May 22, 3:45 PM CDTTornado WatchSPCFremont, Harrison, Mills, Pottawattamie, Shelby7 hr
May 22, 5:52 PM CDTMesoscale DiscussionSPCAdair, Adams, Audubon, Benton, Black Hawk, Boone and 53 more113 min
May 22, 6:15 PM CDTTornado WatchSPCAdair, Adams, Appanoose, Audubon, Benton, Boone and 47 more6 hr
May 21, 7:40 PM CDTTornado WatchSPCAdams, Antelope, Boone, Boyd, Buffalo, Butler and 33 more5 hr
May 21, 10:01 PM CDTMesoscale DiscussionSPCAdams, Antelope, Boone, Boyd, Buffalo, Butler and 33 more89 min
May 22, 1:13 PM CDTMesoscale DiscussionSPCBanner, Chase, Cheyenne, Deuel, Dundy, Keith and 2 more2 hr
May 22, 2:00 PM CDTTornado WatchSPCArthur, Banner, Chase, Cheyenne, Deuel, Dundy and 12 more6 hr
May 22, 3:04 PM CDTMesoscale DiscussionSPCBanner, Chase, Cheyenne, Deuel, Dundy, Keith and 2 more86 min

Nearby

Mesoscale Discussions in Iowa, 2004Mesoscale Discussions in Nebraska, 2004Mesoscale Discussions in Missouri, 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.