Alert archive / Michigan / Mesoscale Discussions in 2005

Mesoscale Discussion 2022

August 18, 2005Cook County, Lake County, Illinois; 10 counties in Michigan; 10 counties in Wisconsin

The Storm Prediction Center issued this mesoscale discussion at Aug 18, 2005, 9:28 PM CDT for Cook County, Lake County, Illinois; 10 counties in Michigan; 10 counties in Wisconsin. It was in force for 92 min.

The area

The outline as issued.

The facts

Issued: Aug 18, 2005, 9:28 PM CDT (02:28 UTC)
Expired: Aug 18, 2005, 11:00 PM CDT
In force: 92 min
Issued by: the Storm Prediction Center

All 22 counties

Cook County, IL, Lake County, IL, Allegan County, MI, Barry County, MI, Berrien County, MI, Branch County, MI, Calhoun County, MI, Cass County, MI, Kalamazoo County, MI, Ottawa County, MI, Saint Joseph County, MI, Van Buren County, MI, Dodge County, WI, Fond du Lac County, WI, Green Lake County, WI, Kenosha County, WI, Milwaukee County, WI, Ozaukee County, WI, Racine County, WI, Sheboygan County, WI, Washington County, WI, Waukesha County, WI

The radar

The Milwaukee radar (KMKX), 114 km from the middle of the area, began a volume at 02:31 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 watches that followed

Watches SPC issued over any of the same counties within four hours of this discussion.

Tornado Watch 734Aug 18, 10:55 PM CDT

The nearest sounding before it

Green Bay/Straub, WI (KGRB), launched 00:00Z, 2.5 hours before the alert went out and 194 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.

Skew-T log-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.

Mixed-layer CAPE: 7 J/kg
Mixed-layer CIN: -105 J/kg
Mixed-layer LCL: 832 m above ground
0-6 km bulk shear: 18 kt
0-1 km storm-relative helicity: 64 m²/s²
0-3 km storm-relative helicity: 161 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

<!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 18, 8:00 PM CDT	Mesoscale Discussion	SPC	Adams, Brown, Cass, Fulton, Greene, Hancock and 9 more	2 hr
Aug 18, 9:53 PM CDT	Mesoscale Discussion	SPC	Champaign, Christian, Clark, Coles, Cumberland, DeWitt and 18 more	67 min
Aug 18, 10:25 PM CDT	Severe Thunderstorm Watch	SPC	Cass, Champaign, Christian, Clark, Coles, Crawford and 24 more	8 hr
Aug 18, 11:15 PM CDT	Mesoscale Discussion	SPC	Adams, Brown, Hancock, McDonough, Pike	60 min
Aug 19, 4:24 AM CDT	Mesoscale Discussion	SPC	Crawford	66 min
Aug 19, 12:49 PM CDT	Mesoscale Discussion	SPC	Crawford, Lawrence, Wabash	86 min
Aug 19, 4:09 PM CDT	Mesoscale Discussion	SPC	Adams, Bond, Brown, Calhoun, Cass, Christian and 23 more	2 hr
Aug 18, 10:55 PM CDT	Tornado Watch	SPC	Barry, Benzie, Calhoun, Clare, Clinton, Crawford and 21 more	4 hr
Aug 19, 1:08 AM CDT	Mesoscale Discussion	SPC	Alcona, Arenac, Barry, Bay, Benzie, Calhoun and 31 more	97 min
Aug 18, 7:28 PM CDT	Mesoscale Discussion	SPC	Columbia, Dane, Green, Marquette, Rock, Waushara	92 min

Nearby

Mesoscale Discussions in Michigan, 2005 Mesoscale Discussions in Wisconsin, 2005 Mesoscale Discussions in Illinois, 2005 Every mesoscale discussion in 2005

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.