Alert archive / Iowa / Mesoscale Discussions in 2004
Mesoscale Discussion 2023
The Storm Prediction Center issued this mesoscale discussion at Aug 16, 2004, 8:54 PM CDT for 36 counties in Iowa; Burt County, Nebraska. It was in force for 2 hr.
The area
The outline as issued.
The facts
- Issued
- Aug 16, 2004, 8:54 PM CDT (01:54 UTC)
- Expired
- Aug 16, 2004, 11:00 PM CDT
- In force
- 2 hr
- Issued by
- the Storm Prediction Center
All 37 counties
Audubon County, IA, Boone County, IA, Calhoun County, IA, Carroll County, IA, Crawford County, IA, Dallas County, IA, Davis County, IA, Greene County, IA, Guthrie County, IA, Hamilton County, IA, Henry County, IA, Iowa County, IA, Jasper County, IA, Jefferson County, IA, Johnson County, IA, Keokuk County, IA, Louisa County, IA, Lucas County, IA, Madison County, IA, Mahaska County, IA, Marion County, IA, Marshall County, IA, Monona County, IA, Monroe County, IA, Muscatine County, IA, Polk County, IA, Poweshiek County, IA, Sac County, IA, Shelby County, IA, Story County, IA, Tama County, IA, Van Buren County, IA, Wapello County, IA, Warren County, IA, Washington County, IA, Webster County, IA, Burt County, NE
The radar
The Des Moines radar (KDMX), 10 km from the middle of the area, began a volume at 01:57 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 00:00Z, 1.9 hours before the alert went out and 222 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
- 1574 J/kg
- Mixed-layer CIN
- -42 J/kg
- Mixed-layer LCL
- 1389 m above ground
- 0-6 km bulk shear
- 30 kt
- 0-1 km storm-relative helicity
- 63 m²/s²
- 0-3 km storm-relative helicity
- 88 m²/s²
- Significant tornado parameter
- 0.3
- Supercell composite
- 2.6
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 17, 12:57 PM CDT | Mesoscale Discussion | SPC | Clinton, Davis, Des Moines, Henry, Lee, Louisa and 3 more | 63 min |
| Aug 17, 1:20 PM CDT | Severe Thunderstorm Watch | SPC | Des Moines, Henry, Lee, Van Buren | 6 hr |
| Aug 17, 3:59 PM CDT | Mesoscale Discussion | SPC | Des Moines, Henry, Lee, Van Buren | 61 min |
| Aug 17, 6:16 PM CDT | Mesoscale Discussion | SPC | Arthur, Blaine, Box Butte, Brown, Cherry, Cheyenne and 13 more | 119 min |
Nearby
Mesoscale Discussions in Iowa, 2004Mesoscale Discussions in Nebraska, 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.