Alert archive / Iowa / Mesoscale Discussions in 2004
Mesoscale Discussion 1257
The Storm Prediction Center issued this mesoscale discussion at Jun 13, 2004, 11:18 PM CDT for 4 states. It was in force for 2 hr.
The area
The outline as issued.
The facts
- Issued
- Jun 13, 2004, 11:18 PM CDT (04:18 UTC)
- Expired
- Jun 14, 2004, 1:45 AM CDT
- In force
- 2 hr
- Issued by
- the Storm Prediction Center
All 35 counties
Buena Vista County, IA, Calhoun County, IA, Cherokee County, IA, Clay County, IA, Dickinson County, IA, Emmet County, IA, Humboldt County, IA, Ida County, IA, Lyon County, IA, O'Brien County, IA, Osceola County, IA, Palo Alto County, IA, Plymouth County, IA, Pocahontas County, IA, Sac County, IA, Sioux County, IA, Webster County, IA, Woodbury County, IA, Jackson County, MN, Murray County, MN, Nobles County, MN, Rock County, MN, Cedar County, NE, Dakota County, NE, Dixon County, NE, Pierce County, NE, Thurston County, NE, Wayne County, NE, Clay County, SD, Lincoln County, SD, McCook County, SD, Minnehaha County, SD, Turner County, SD, Union County, SD, Yankton County, SD
The radar
The Sioux Falls radar (KFSD), 108 km from the middle of the area, began a volume at 04:18 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 00:00Z, 4.3 hours before the alert went out and 182 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
- 84 J/kg
- Mixed-layer CIN
- -158 J/kg
- Mixed-layer LCL
- 2073 m above ground
- 0-6 km bulk shear
- 44 kt
- 0-1 km storm-relative helicity
- 118 m²/s²
- 0-3 km storm-relative helicity
- 208 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.4
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 |
|---|---|---|---|---|
| Jun 13, 11:56 PM CDT | Mesoscale Discussion | SPC | Adair, Adams, Appanoose, Audubon, Cass, Clarke and 22 more | 3 hr |
| Jun 14, 3:05 AM CDT | Severe Thunderstorm Watch | SPC | Adair, Adams, Appanoose, Audubon, Benton, Black Hawk and 68 more | 6 hr |
| Jun 14, 5:25 AM CDT | Mesoscale Discussion | SPC | Benton, Boone, Cedar, Clarke, Clinton, Dallas and 29 more | 3 hr |
| Jun 14, 6:50 AM CDT | Severe Thunderstorm Watch | SPC | Clinton, Dubuque, Jackson, Scott | 6 hr |
| Jun 14, 7:42 AM CDT | Mesoscale Discussion | SPC | Appanoose, Cedar, Clinton, Davis, Des Moines, Henry and 13 more | 2 hr |
Nearby
Mesoscale Discussions in Iowa, 2004Mesoscale Discussions in South Dakota, 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.