Alert archive / Wisconsin / Mesoscale Discussions in 2012

Mesoscale Discussion 1211

June 18, 201213 counties in Wisconsin

The Storm Prediction Center issued this mesoscale discussion at Jun 18, 2012, 6:00 PM CDT for 13 counties in Wisconsin. It was in force for 60 min.

The area

The outline as issued.

The facts

Issued: Jun 18, 2012, 6:00 PM CDT (23:00 UTC)
Expired: Jun 18, 2012, 7:00 PM CDT
In force: 60 min
Issued by: the Storm Prediction Center

Counties Brown County, WI, Calumet County, WI, Door County, WI, Green Lake County, WI, Kewaunee County, WI, Manitowoc County, WI, Marquette County, WI, Oconto County, WI, Outagamie County, WI, Shawano County, WI, Waupaca County, WI, Waushara County, WI, Winnebago County, WI

The radar

The Green Bay radar (KGRB), 11 km from the middle of the area, began a volume at 23:00 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

Green Bay/Straub, WI (KGRB), launched 12:00Z, 11.0 hours before the alert went out and 12 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: 67 J/kg
Mixed-layer CIN: -387 J/kg
Mixed-layer LCL: 1455 m above ground
0-6 km bulk shear: 42 kt
0-1 km storm-relative helicity: 382 m²/s²
0-3 km storm-relative helicity: 524 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.7

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
Jun 17, 7:27 PM CDT	Mesoscale Discussion	SPC	Pierce, Polk, Saint Croix	93 min
Jun 17, 7:57 PM CDT	Severe Thunderstorm Watch	SPC	Adams, Barron, Buffalo, Burnett, Chippewa, Clark and 21 more	8 hr
Jun 17, 10:55 PM CDT	Mesoscale Discussion	SPC	Buffalo, La Crosse, Pierce, Trempealeau	95 min
Jun 18, 1:28 AM CDT	Mesoscale Discussion	SPC	Adams, Buffalo, Chippewa, Clark, Columbia, Dunn and 22 more	62 min
Jun 18, 11:40 AM CDT	Mesoscale Discussion	SPC	Adams, Brown, Buffalo, Calumet, Clark, Door and 27 more	2 hr
Jun 18, 12:24 PM CDT	Severe Thunderstorm Watch	SPC	Adams, Brown, Buffalo, Calumet, Clark, Door and 29 more	8 hr
Jun 18, 2:49 PM CDT	Mesoscale Discussion	SPC	Brown, Calumet, Kewaunee, Marinette, Menominee, Oconto and 5 more	86 min
Jun 18, 3:50 PM CDT	Mesoscale Discussion	SPC	Door, Kewaunee	85 min

Nearby

Mesoscale Discussions in Wisconsin, 2012 Every mesoscale discussion in 2012

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.