Alert archive / Illinois / Mesoscale Discussions in 2012

Mesoscale Discussion 1187

June 16, 201219 counties in Illinois; 8 counties in Iowa; Clark County, Lewis County, Scotland County, Missouri

The Storm Prediction Center issued this mesoscale discussion at Jun 16, 2012, 12:42 PM CDT for 19 counties in Illinois; 8 counties in Iowa; Clark County, Lewis County, Scotland County, Missouri. It was in force for 63 min.

The area

The outline as issued.

The facts

Issued: Jun 16, 2012, 12:42 PM CDT (17:42 UTC)
Expired: Jun 16, 2012, 1:45 PM CDT
In force: 63 min
Issued by: the Storm Prediction Center
Chance of a watch: 80%

All 30 counties

Clinton County, IA, Des Moines County, IA, Henry County, IA, Lee County, IA, Louisa County, IA, Muscatine County, IA, Scott County, IA, Van Buren County, IA, Adams County, IL, Brown County, IL, Bureau County, IL, Carroll County, IL, Fulton County, IL, Hancock County, IL, Henderson County, IL, Henry County, IL, Knox County, IL, Lee County, IL, McDonough County, IL, Mercer County, IL, Peoria County, IL, Pike County, IL, Rock Island County, IL, Schuyler County, IL, Stark County, IL, Warren County, IL, Whiteside County, IL, Clark County, MO, Lewis County, MO, Scotland County, MO

The radar

The Quad Cities radar (KDVN), 90 km from the middle of the area, began a volume at 17:45 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.

Severe Thunderstorm Watch 401Jun 16, 2:45 PM CDT

The nearest sounding before it

Davenport, (KDVN), launched 12:00Z, 5.7 hours before the alert went out and 94 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: 208 J/kg
Mixed-layer CIN: -3 J/kg
Mixed-layer LCL: 515 m above ground
0-6 km bulk shear: 29 kt
0-1 km storm-relative helicity: 130 m²/s²
0-3 km storm-relative helicity: 101 m²/s²
Significant tornado parameter: 0.1
Supercell composite: 2.2

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 16, 2:45 PM CDT	Severe Thunderstorm Watch	SPC	Adams, Brown, Bureau, Calhoun, Carroll, Cass and 23 more	6 hr
Jun 16, 3:38 PM CDT	Mesoscale Discussion	SPC	Carroll, Fulton, Hancock, Henderson, Henry, Knox and 6 more	97 min
Jun 16, 6:10 PM CDT	Mesoscale Discussion	SPC	Bureau, DeKalb, DuPage, Grundy, Henry, Kane and 10 more	95 min
Jun 16, 6:40 PM CDT	Severe Thunderstorm Watch	SPC	Boone, Cook, DeKalb, DuPage, Ford, Grundy and 12 more	6 hr
Jun 16, 11:40 AM CDT	Mesoscale Discussion	SPC	Adams, Appanoose, Clarke, Decatur, Lucas, Marion and 7 more	95 min
Jun 16, 12:35 PM CDT	Severe Thunderstorm Watch	SPC	Adair, Adams, Appanoose, Cass, Clarke, Davis and 12 more	5 hr
Jun 16, 5:36 PM CDT	Mesoscale Discussion	SPC	Audrain, Barton, Bates, Benton, Boone, Callaway and 32 more	84 min

Nearby

Mesoscale Discussions in Illinois, 2012 Mesoscale Discussions in Iowa, 2012 Mesoscale Discussions in Missouri, 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.