Alert archive / Nebraska / Mesoscale Discussions in 2018
Mesoscale Discussion 1077
The Storm Prediction Center issued this mesoscale discussion at Jul 18, 2018, 4:59 PM CDT for 21 counties in Nebraska. It was in force for 91 min.
The area
The outline as issued.
The facts
- Issued
- Jul 18, 2018, 4:59 PM CDT (21:59 UTC)
- Expired
- Jul 18, 2018, 6:30 PM CDT
- In force
- 91 min
- Issued by
- the Storm Prediction Center
- Chance of a watch
- 60%
All 21 counties
Blaine County, NE, Brown County, NE, Buffalo County, NE, Cherry County, NE, Custer County, NE, Dawson County, NE, Garfield County, NE, Grant County, NE, Greeley County, NE, Hall County, NE, Hooker County, NE, Howard County, NE, Kearney County, NE, Logan County, NE, Loup County, NE, McPherson County, NE, Merrick County, NE, Phelps County, NE, Sherman County, NE, Thomas County, NE, Valley County, NE
The radar
The North Platte radar (KLNX), 55 km from the middle of the area, began a volume at 21:59 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
N. Platte/Lee Bi, NE (KLBF), launched 12:00Z, 10.0 hours before the alert went out and 76 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
- 86 J/kg
- Mixed-layer CIN
- -112 J/kg
- Mixed-layer LCL
- 1058 m above ground
- 0-6 km bulk shear
- 42 kt
- 0-1 km storm-relative helicity
- -91 m²/s²
- 0-3 km storm-relative helicity
- 147 m²/s²
- Significant tornado parameter
- -0.0
- Supercell composite
- -0.7
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 |
|---|---|---|---|---|
| Jul 17, 11:04 PM CDT | Mesoscale Discussion | SPC | Box Butte, Dawes, Scotts Bluff, Sheridan, Sioux | 86 min |
| Jul 18, 1:57 AM CDT | Mesoscale Discussion | SPC | Arthur, Garden, Grant, Hooker, Keith, McPherson and 2 more | 2 hr |
| Jul 18, 1:39 PM CDT | Mesoscale Discussion | SPC | Boyd, Brown, Holt, Keya Paha, Rock | 2 hr |
| Jul 18, 3:43 PM CDT | Tornado Watch | SPC | Antelope, Boyd, Brown, Cedar, Garfield, Holt and 5 more | 7 hr |
| Jul 18, 5:16 PM CDT | Mesoscale Discussion | SPC | Antelope, Boyd, Cedar, Dixon, Holt, Keya Paha and 5 more | 119 min |
| Jul 18, 6:14 PM CDT | Severe Thunderstorm Watch | SPC | Adams, Antelope, Blaine, Boone, Boyd, Brown and 52 more | 7 hr |
Nearby
Mesoscale Discussions in Nebraska, 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.