Alert archive / South Dakota / Mesoscale Discussions in 2011
Mesoscale Discussion 1790
The Storm Prediction Center issued this mesoscale discussion at Jul 29, 2011, 8:06 PM MDT for 8 counties in North Dakota; 14 counties in South Dakota. It was in force for 54 min.
The area
The outline as issued.
The facts
- Issued
- Jul 29, 2011, 8:06 PM MDT (02:06 UTC)
- Expired
- Jul 29, 2011, 9:00 PM MDT
- In force
- 54 min
- Issued by
- the Storm Prediction Center
All 22 counties
Adams County, ND, Bowman County, ND, Emmons County, ND, Grant County, ND, Hettinger County, ND, McIntosh County, ND, Sioux County, ND, Slope County, ND, Campbell County, SD, Corson County, SD, Dewey County, SD, Haakon County, SD, Harding County, SD, Hughes County, SD, Hyde County, SD, McPherson County, SD, Perkins County, SD, Potter County, SD, Stanley County, SD, Sully County, SD, Walworth County, SD, Ziebach County, SD
The radar
The Rapid City radar (KUDX), 167 km from the middle of the area, began a volume at 02:09 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
Bismarck Municip, ND (KBIS), launched 00:00Z, 2.1 hours before the alert went out and 173 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
- 478 J/kg
- Mixed-layer CIN
- -202 J/kg
- Mixed-layer LCL
- 2027 m above ground
- 0-6 km bulk shear
- 32 kt
- 0-1 km storm-relative helicity
- 33 m²/s²
- 0-3 km storm-relative helicity
- 132 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.9
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 |
|---|---|---|---|---|
| Jul 29, 9:14 PM MDT | Mesoscale Discussion | SPC | Billings, Bottineau, Burke, Burleigh, Divide, Dunn and 12 more | 61 min |
| Jul 29, 10:52 PM MDT | Mesoscale Discussion | SPC | Barnes, Benson, Billings, Bottineau, Burleigh, Dickey and 23 more | 83 min |
| Jul 30, 4:47 AM MDT | Mesoscale Discussion | SPC | Dickey, LaMoure, McIntosh, Ransom, Richland, Sargent | 88 min |
| Jul 30, 2:22 PM MDT | Mesoscale Discussion | SPC | Barnes, Cass, Dickey, Griggs, LaMoure, Ransom and 4 more | 53 min |
| Jul 30, 4:31 PM MDT | Severe Thunderstorm Watch | SPC | Richland, Sargent | 7 hr |
| Jul 30, 12:28 PM MDT | Severe Thunderstorm Watch | SPC | Brookings, Clark, Codington, Day, Deuel, Grant and 5 more | 112 min |
Nearby
Mesoscale Discussions in South Dakota, 2011Mesoscale Discussions in North Dakota, 2011Every mesoscale discussion in 2011
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.