Alert archive / Illinois / Mesoscale Discussions in 2018
Mesoscale Discussion 890
The Storm Prediction Center issued this mesoscale discussion at Jun 26, 2018, 1:31 PM CDT for 11 counties in Illinois; 4 counties in Iowa; 6 counties in Wisconsin. It was in force for 89 min.
The area
The outline as issued.
The facts
- Issued
- Jun 26, 2018, 1:31 PM CDT (18:31 UTC)
- Expired
- Jun 26, 2018, 3:00 PM CDT
- In force
- 89 min
- Issued by
- the Storm Prediction Center
- Chance of a watch
- 20%
All 21 counties
Clinton County, IA, Dubuque County, IA, Jackson County, IA, Jones County, IA, Boone County, IL, Bureau County, IL, Carroll County, IL, DeKalb County, IL, Jo Daviess County, IL, Kane County, IL, Lee County, IL, Ogle County, IL, Stephenson County, IL, Whiteside County, IL, Winnebago County, IL, Dane County, WI, Grant County, WI, Green County, WI, Iowa County, WI, Lafayette County, WI, Rock County, WI
The radar
The Quad Cities radar (KDVN), 75 km from the middle of the area, began a volume at 18:32 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
Davenport, (KDVN), launched 12:00Z, 6.5 hours before the alert went out and 71 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
- 1133 J/kg
- Mixed-layer CIN
- -2 J/kg
- Mixed-layer LCL
- 503 m above ground
- 0-6 km bulk shear
- 35 kt
- 0-1 km storm-relative helicity
- 119 m²/s²
- 0-3 km storm-relative helicity
- 153 m²/s²
- Significant tornado parameter
- 0.6
- Supercell composite
- 3.8
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 |
|---|---|---|---|---|
| Jun 25, 8:08 PM CDT | Mesoscale Discussion | SPC | Alexander, Clinton, Edwards, Franklin, Gallatin, Hamilton and 19 more | 2 hr |
| Jun 26, 2:19 AM CDT | Mesoscale Discussion | SPC | Monroe | 116 min |
| Jun 26, 7:39 AM CDT | Mesoscale Discussion | SPC | Alexander, Bond, Christian, Clark, Clay, Clinton and 39 more | 2 hr |
| Jun 26, 9:26 AM CDT | Severe Thunderstorm Watch | SPC | Edwards, Gallatin, Hardin, Massac, Pope, Saline and 2 more | 5 hr |
| Jun 26, 1:53 PM CDT | Mesoscale Discussion | SPC | Alexander, Franklin, Jackson, Johnson, Perry, Pulaski and 3 more | 67 min |
| Jun 26, 2:22 PM CDT | Severe Thunderstorm Watch | SPC | Alexander, Franklin, Gallatin, Hardin, Jackson, Johnson and 10 more | 6 hr |
| Jun 25, 7:25 PM CDT | Mesoscale Discussion | SPC | Boone, Carroll, Clarke, Dallas, Greene, Guthrie and 4 more | 2 hr |
Nearby
Mesoscale Discussions in Illinois, 2018Mesoscale Discussions in Wisconsin, 2018Mesoscale Discussions in Iowa, 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.