Alert archive / Nebraska / Mesoscale Discussions in 2017
Mesoscale Discussion 1484
The Storm Prediction Center issued this mesoscale discussion at Aug 12, 2017, 5:16 PM MDT for 4 states. It was in force for 89 min.
The area
The outline as issued.
The facts
- Issued
- Aug 12, 2017, 5:16 PM MDT (23:16 UTC)
- Expired
- Aug 12, 2017, 6:45 PM MDT
- In force
- 89 min
- Issued by
- the Storm Prediction Center
All 48 counties
Cheyenne County, CO, Kit Carson County, CO, Logan County, CO, Phillips County, CO, Sedgwick County, CO, Washington County, CO, Yuma County, CO, Cheyenne County, KS, Rawlins County, KS, Sherman County, KS, Thomas County, KS, Wallace County, KS, Arthur County, NE, Blaine County, NE, Box Butte County, NE, Brown County, NE, Chase County, NE, Cherry County, NE, Cheyenne County, NE, Custer County, NE, Dawes County, NE, Dawson County, NE, Deuel County, NE, Dundy County, NE, Frontier County, NE, Garden County, NE, Grant County, NE, Hayes County, NE, Hitchcock County, NE, Hooker County, NE, Keith County, NE, Keya Paha County, NE, Lincoln County, NE, Logan County, NE, Loup County, NE, McPherson County, NE, Morrill County, NE, Perkins County, NE, Red Willow County, NE, Rock County, NE, Sheridan County, NE, Thomas County, NE, Bennett County, SD, Jackson County, SD, Mellette County, SD, Oglala Lakota County, SD, Todd County, SD, Tripp County, SD
The radar
The North Platte radar (KLNX), 85 km from the middle of the area, began a volume at 23:15 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
N. Platte/Lee Bi, NE (KLBF), launched 12:00Z, 11.3 hours before the alert went out and 130 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
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 1071 m above ground
- 0-6 km bulk shear
- 29 kt
- 0-1 km storm-relative helicity
- 67 m²/s²
- 0-3 km storm-relative helicity
- 123 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.1
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 |
|---|---|---|---|---|
| Aug 12, 2:59 PM MDT | Severe Thunderstorm Watch | SPC | Cheyenne, Kit Carson, Logan, Morgan, Phillips, Sedgwick and 2 more | 7 hr |
| Aug 12, 1:36 PM MDT | Mesoscale Discussion | SPC | Arthur, Box Butte, Brown, Cherry, Cheyenne, Dawes and 9 more | 114 min |
| Aug 12, 4:46 PM MDT | Mesoscale Discussion | SPC | Campbell, Corson, Dewey, Edmunds, Harding, Perkins and 4 more | 89 min |
Nearby
Mesoscale Discussions in Nebraska, 2017Mesoscale Discussions in Colorado, 2017Mesoscale Discussions in South Dakota, 2017Every mesoscale discussion in 2017
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.