Alert archive / Nebraska / Mesoscale Discussions in 2018
Mesoscale Discussion 444
The Storm Prediction Center issued this mesoscale discussion at May 17, 2018, 4:19 PM MDT for 9 counties in Colorado; 16 counties in Nebraska; Goshen County, Laramie County, Wyoming. It was in force for 116 min.
The area
The outline as issued.
The facts
- Issued
- May 17, 2018, 4:19 PM MDT (22:19 UTC)
- Expired
- May 17, 2018, 6:15 PM MDT
- In force
- 116 min
- Issued by
- the Storm Prediction Center
- Chance of a watch
- 60%
All 27 counties
Adams County, CO, Arapahoe County, CO, Logan County, CO, Morgan County, CO, Phillips County, CO, Sedgwick County, CO, Washington County, CO, Weld County, CO, Yuma County, CO, Arthur County, NE, Banner County, NE, Box Butte County, NE, Chase County, NE, Cheyenne County, NE, Dawes County, NE, Deuel County, NE, Garden County, NE, Grant County, NE, Keith County, NE, Kimball County, NE, Morrill County, NE, Perkins County, NE, Scotts Bluff County, NE, Sheridan County, NE, Sioux County, NE, Goshen County, WY, Laramie County, WY
The radar
The Cheyenne radar (KCYS), 123 km from the middle of the area, began a volume at 22:22 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
Rapid City, SD (KRAP), launched 12:00Z, 10.3 hours before the alert went out and 285 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
- 975 J/kg
- Mixed-layer CIN
- -186 J/kg
- Mixed-layer LCL
- 2104 m above ground
- 0-6 km bulk shear
- 25 kt
- 0-1 km storm-relative helicity
- -27 m²/s²
- 0-3 km storm-relative helicity
- -53 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
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 17, 1:38 PM MDT | Mesoscale Discussion | SPC | Baca, Prowers | 2 hr |
| May 17, 2:37 PM MDT | Severe Thunderstorm Watch | SPC | Baca, Prowers | 6 hr |
| May 17, 4:57 PM MDT | Severe Thunderstorm Watch | SPC | Logan, Phillips, Sedgwick | 6 hr |
| May 17, 12:58 PM MDT | Mesoscale Discussion | SPC | Banner, Box Butte, Cheyenne, Dawes, Garden, Grant and 5 more | 92 min |
| May 17, 1:23 PM MDT | Severe Thunderstorm Watch | SPC | Crook, Weston | 10 hr |
| May 17, 4:54 PM MDT | Mesoscale Discussion | SPC | Crook, Niobrara, Weston | 66 min |
Nearby
Mesoscale Discussions in Nebraska, 2018Mesoscale Discussions in Colorado, 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.