Alert archive / Iowa / Mesoscale Discussions in 2004

Mesoscale Discussion 1853

August 3, 200438 counties in Iowa; 15 counties in Minnesota; 4 counties in South Dakota

The Storm Prediction Center issued this mesoscale discussion at Aug 3, 2004, 10:48 AM CDT for 38 counties in Iowa; 15 counties in Minnesota; 4 counties in South Dakota. It was in force for 87 min.

The area

The outline as issued.

The facts

Issued
Aug 3, 2004, 10:48 AM CDT (15:48 UTC)
Expired
Aug 3, 2004, 12:15 PM CDT
In force
87 min
Issued by
the Storm Prediction Center
All 57 counties

Allamakee County, IA, Black Hawk County, IA, Bremer County, IA, Buchanan County, IA, Buena Vista County, IA, Butler County, IA, Calhoun County, IA, Cerro Gordo County, IA, Cherokee County, IA, Chickasaw County, IA, Clay County, IA, Clayton County, IA, Delaware County, IA, Dickinson County, IA, Emmet County, IA, Fayette County, IA, Floyd County, IA, Franklin County, IA, Grundy County, IA, Hamilton County, IA, Hancock County, IA, Hardin County, IA, Howard County, IA, Humboldt County, IA, Kossuth County, IA, Lyon County, IA, Mitchell County, IA, O'Brien County, IA, Osceola County, IA, Palo Alto County, IA, Pocahontas County, IA, Sioux County, IA, Story County, IA, Webster County, IA, Winnebago County, IA, Winneshiek County, IA, Worth County, IA, Wright County, IA, Blue Earth County, MN, Cottonwood County, MN, Faribault County, MN, Fillmore County, MN, Freeborn County, MN, Jackson County, MN, Martin County, MN, Mower County, MN, Murray County, MN, Nobles County, MN, Pipestone County, MN, Rock County, MN, Steele County, MN, Waseca County, MN, Watonwan County, MN, Lincoln County, SD, Minnehaha County, SD, Moody County, SD, Turner County, SD

The radar

The Sioux Falls radar (KFSD), 168 km from the middle of the area, began a volume at 15:47 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

Minneapolis, MN (KMPX), launched 12:00Z, 3.8 hours before the alert went out and 184 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, Minneapolis, MN at 12:00Z on 2004-08-03Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 485 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, Minneapolis, MN at 12:00Z on 2004-08-03The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 5 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
485 J/kg
Mixed-layer CIN
-116 J/kg
Mixed-layer LCL
957 m above ground
0-6 km bulk shear
36 kt
0-1 km storm-relative helicity
5 m²/s²
0-3 km storm-relative helicity
35 m²/s²
Significant tornado parameter
-0.0
Supercell composite
-0.3

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 3, 2:02 AM CDTMesoscale DiscussionSPCBenton, Black Hawk, Boone, Buena Vista, Butler, Calhoun and 30 more118 min
Aug 3, 7:21 AM CDTMesoscale DiscussionSPCLyon54 min
Aug 3, 11:05 AM CDTSevere Thunderstorm WatchSPCBremer, Buena Vista, Butler, Calhoun, Cerro Gordo, Cherokee and 25 more6 hr
Aug 3, 1:16 PM CDTMesoscale DiscussionSPCBenton, Black Hawk, Boone, Bremer, Buchanan, Buena Vista and 46 more89 min
Aug 3, 2:25 PM CDTSevere Thunderstorm WatchSPCAllamakee, Bremer, Butler, Cerro Gordo, Chickasaw, Clayton and 7 more5 hr
Aug 3, 3:00 PM CDTMesoscale DiscussionSPCAdair, Audubon, Carroll, Cass, Crawford, Greene and 8 more2 hr
Aug 3, 3:55 PM CDTMesoscale DiscussionSPCAdair, Appanoose, Benton, Black Hawk, Boone, Buchanan and 43 more95 min
Aug 3, 4:25 PM CDTTornado WatchSPCAppanoose, Benton, Black Hawk, Boone, Buchanan, Cedar and 39 more6 hr
Aug 3, 4:52 PM CDTMesoscale DiscussionSPCAdams, Audubon, Cass, Fremont, Harrison, Mills and 5 more53 min
Aug 3, 5:00 PM CDTTornado WatchSPCAdair, Adams, Audubon, Cass, Fremont, Guthrie and 9 more5 hr
Aug 3, 5:07 PM CDTMesoscale DiscussionSPCAllamakee, Clayton, Fayette, Winneshiek53 min
Aug 3, 5:39 PM CDTMesoscale DiscussionSPCAppanoose, Benton, Black Hawk, Buchanan, Cedar, Clarke and 32 more66 min
Aug 3, 6:34 PM CDTMesoscale DiscussionSPCAppanoose, Benton, Black Hawk, Buchanan, Cedar, Clinton and 28 more86 min
Aug 3, 6:45 PM CDTMesoscale DiscussionSPCAdair, Adams, Audubon, Cass, Fremont, Guthrie and 9 more90 min
Aug 2, 7:47 PM CDTMesoscale DiscussionSPCAurora, Bennett, Bon Homme, Brule, Buffalo, Charles Mix and 19 more58 min
Aug 2, 9:07 PM CDTMesoscale DiscussionSPCButte, Harding, Lawrence, Meade53 min
Aug 3, 2:30 AM CDTMesoscale DiscussionSPCHaakon, Hughes, Jones, Meade, Stanley, Ziebach2 hr
Aug 3, 3:00 AM CDTSevere Thunderstorm WatchSPCBuffalo, Haakon, Hughes, Hyde, Jones, Lyman and 4 more5 hr
Aug 3, 5:04 AM CDTMesoscale DiscussionSPCBuffalo, Haakon, Hughes, Hyde, Jones, Lyman and 2 more116 min
Aug 3, 8:00 AM CDTSevere Thunderstorm WatchSPCAurora, Beadle, Brule, Buffalo, Davison, Douglas and 14 more5 hr
Aug 3, 2:53 PM CDTMesoscale DiscussionSPCButte, Custer, Harding, Lawrence, Meade, Pennington and 1 more2 hr

Nearby

Mesoscale Discussions in Iowa, 2004Mesoscale Discussions in Minnesota, 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.