Alert archive / Iowa / Mesoscale Discussions in 2004
Mesoscale Discussion 2123
The Storm Prediction Center issued this mesoscale discussion at Aug 26, 2004, 7:45 PM CDT for 5 states. It was in force for 90 min.
The area
The outline as issued.
The facts
- Issued
- Aug 26, 2004, 7:45 PM CDT (00:45 UTC)
- Expired
- Aug 26, 2004, 9:15 PM CDT
- In force
- 90 min
- Issued by
- the Storm Prediction Center
All 94 counties
Adair County, IA, Adams County, IA, Allamakee County, IA, Audubon County, IA, Benton County, IA, Black Hawk County, IA, Boone County, IA, Bremer County, IA, Buchanan County, IA, Butler County, IA, Calhoun County, IA, Carroll County, IA, Cass County, IA, Cerro Gordo County, IA, Chickasaw County, IA, Clarke County, IA, Clayton County, IA, Dallas County, IA, Decatur County, IA, Delaware County, IA, Dubuque County, IA, Fayette County, IA, Floyd County, IA, Franklin County, IA, Fremont County, IA, Greene County, IA, Grundy County, IA, Guthrie County, IA, Hamilton County, IA, Hancock County, IA, Hardin County, IA, Howard County, IA, Iowa County, IA, Jasper County, IA, Jones County, IA, Keokuk County, IA, Linn County, IA, Lucas County, IA, Madison County, IA, Mahaska County, IA, Marion County, IA, Marshall County, IA, Mills County, IA, Mitchell 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, Story County, IA, Tama County, IA, Taylor County, IA, Union County, IA, Warren County, IA, Wayne County, IA, Webster County, IA, Winneshiek County, IA, Worth County, IA, Wright County, IA, Fillmore County, MN, Houston County, MN, Mower County, MN, Andrew County, MO, Atchison County, MO, Daviess County, MO, Gentry County, MO, Harrison County, MO, Holt County, MO, Mercer County, MO, Nodaway County, MO, Worth County, MO, Cass County, NE, Gage County, NE, Jefferson County, NE, Johnson County, NE, Lancaster County, NE, Nemaha County, NE, Otoe County, NE, Pawnee County, NE, Richardson County, NE, Sarpy County, NE, Columbia County, WI, Crawford County, WI, Grant County, WI, Green Lake County, WI, Iowa County, WI, La Crosse County, WI, Marquette County, WI, Richland County, WI, Sauk County, WI, Vernon County, WI
The radar
The Des Moines radar (KDMX), 80 km from the middle of the area, began a volume at 00:46 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
Davenport, (KDVN), launched 00:00Z, 0.8 hours before the alert went out and 234 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.
- Mixed-layer CAPE
- 3587 J/kg
- Mixed-layer CIN
- -9 J/kg
- Mixed-layer LCL
- 948 m above ground
- 0-6 km bulk shear
- 41 kt
- 0-1 km storm-relative helicity
- 132 m²/s²
- 0-3 km storm-relative helicity
- 211 m²/s²
- Significant tornado parameter
- 3.5
- Supercell composite
- 18.5
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.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 26, 9:13 PM CDT | Mesoscale Discussion | SPC | Allamakee, Appanoose, Benton, Black Hawk, Bremer, Buchanan and 39 more | 62 min |
| Aug 26, 9:45 PM CDT | Severe Thunderstorm Watch | SPC | Allamakee, Appanoose, Benton, Black Hawk, Buchanan, Cedar and 36 more | 6 hr |
| Aug 27, 1:49 AM CDT | Mesoscale Discussion | SPC | Appanoose, Davis, Des Moines, Henry, Lee, Louisa and 1 more | 56 min |
| Aug 27, 4:10 PM CDT | Mesoscale Discussion | SPC | Appanoose, Cedar, Clarke, Clinton, Davis, Decatur and 21 more | 2 hr |
| Aug 27, 9:24 AM CDT | Mesoscale Discussion | SPC | Audrain, Bates, Benton, Boone, Callaway, Camden and 30 more | 96 min |
| Aug 27, 9:40 AM CDT | Severe Thunderstorm Watch | SPC | Audrain, Barton, Bates, Benton, Boone, Callaway and 33 more | 5 hr |
| Aug 27, 1:07 PM CDT | Mesoscale Discussion | SPC | Adair, Andrew, Audrain, Barton, Bates, Benton and 70 more | 113 min |
| Aug 27, 2:45 PM CDT | Severe Thunderstorm Watch | SPC | Adair, Buchanan, Caldwell, Carroll, Chariton, Clay and 17 more | 6 hr |
| Aug 27, 2:45 PM CDT | Severe Thunderstorm Watch | SPC | Audrain, Barton, Bates, Benton, Boone, Callaway and 32 more | 6 hr |
| Aug 27, 3:49 PM CDT | Mesoscale Discussion | SPC | Adair, Audrain, Barton, Bates, Benton, Boone and 57 more | 86 min |
| Aug 26, 11:53 PM CDT | Mesoscale Discussion | SPC | Kenosha | 97 min |
| Aug 27, 1:25 AM CDT | Severe Thunderstorm Watch | SPC | Kenosha, Milwaukee, Racine | 6 hr |
Nearby
Mesoscale Discussions in Iowa, 2004Mesoscale Discussions in Nebraska, 2004Mesoscale Discussions in Wisconsin, 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.