Alert archive / Nebraska / Mesoscale Discussions in 2018
Mesoscale Discussion 548
The Storm Prediction Center issued this mesoscale discussion at May 27, 2018, 7:31 PM MDT for 20 counties in Nebraska; 15 counties in South Dakota; Crook County, Niobrara County, Weston County, Wyoming. It was in force for 119 min.
The area
The outline as issued.
The facts
- Issued
- May 27, 2018, 7:31 PM MDT (01:31 UTC)
- Expired
- May 27, 2018, 9:30 PM MDT
- In force
- 119 min
- Issued by
- the Storm Prediction Center
All 38 counties
Arthur County, NE, Box Butte County, NE, Chase County, NE, Cherry County, NE, Dawes County, NE, Deuel County, NE, Garden County, NE, Grant County, NE, Hayes County, NE, Hooker County, NE, Keith County, NE, Lincoln County, NE, Logan County, NE, McPherson County, NE, Morrill County, NE, Perkins County, NE, Scotts Bluff County, NE, Sheridan County, NE, Sioux County, NE, Thomas County, NE, Bennett County, SD, Butte County, SD, Custer County, SD, Fall River County, SD, Haakon County, SD, Jackson County, SD, Jones County, SD, Lawrence County, SD, Meade County, SD, Mellette County, SD, Oglala Lakota County, SD, Pennington County, SD, Stanley County, SD, Todd County, SD, Ziebach County, SD, Crook County, WY, Niobrara County, WY, Weston County, WY
The radar
The Rapid City radar (KUDX), 130 km from the middle of the area, began a volume at 01:31 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
Rapid City, SD (KRAP), launched 00:00Z, 1.5 hours before the alert went out and 125 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
- 757 J/kg
- Mixed-layer CIN
- -156 J/kg
- Mixed-layer LCL
- 1692 m above ground
- 0-6 km bulk shear
- 42 kt
- 0-1 km storm-relative helicity
- 17 m²/s²
- 0-3 km storm-relative helicity
- 345 m²/s²
- Significant tornado parameter
- 0.1
- Supercell composite
- 8.8
The text
As transmitted.
<!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 |
|---|---|---|---|---|
| May 28, 4:23 AM MDT | Mesoscale Discussion | SPC | Blaine, Brown, Buffalo, Custer, Dawson, Frontier and 11 more | 3 hr |
| May 28, 1:12 PM MDT | Tornado Watch | SPC | Dundy, Nuckolls, Webster | 8 hr |
| May 28, 1:39 PM MDT | Mesoscale Discussion | SPC | Banner, Kimball | 96 min |
| May 28, 2:01 PM MDT | Severe Thunderstorm Watch | SPC | Banner, Kimball, Scotts Bluff, Sioux | 7 hr |
| May 27, 10:14 PM MDT | Mesoscale Discussion | SPC | Custer, Haakon, Jackson, Jones, Lawrence, Meade and 5 more | 91 min |
| May 28, 12:19 PM MDT | Mesoscale Discussion | SPC | Albany, Carbon | 86 min |
Nearby
Mesoscale Discussions in Nebraska, 2018Mesoscale Discussions in South Dakota, 2018Mesoscale Discussions in Wyoming, 2018Every mesoscale discussion in 2018
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.