Alert archive / Missouri / Mesoscale Discussions in 2013

Mesoscale Discussion 835

May 28, 201317 counties in Illinois; Lee County, Van Buren County, Iowa; 25 counties in Missouri

The Storm Prediction Center issued this mesoscale discussion at May 28, 2013, 3:30 AM CDT for 17 counties in Illinois; Lee County, Van Buren County, Iowa; 25 counties in Missouri. It was in force for 90 min.

The area

The outline as issued.

The facts

Issued: May 28, 2013, 3:30 AM CDT (08:30 UTC)
Expired: May 28, 2013, 5:00 AM CDT
In force: 90 min
Issued by: the Storm Prediction Center

All 44 counties

Lee County, IA, Van Buren County, IA, Adams County, IL, Brown County, IL, Calhoun County, IL, Cass County, IL, Fulton County, IL, Greene County, IL, Hancock County, IL, Henderson County, IL, Jersey County, IL, Macoupin County, IL, Mason County, IL, McDonough County, IL, Menard County, IL, Morgan County, IL, Pike County, IL, Schuyler County, IL, Scott County, IL, Adair County, MO, Audrain County, MO, Boone County, MO, Callaway County, MO, Clark County, MO, Cole County, MO, Cooper County, MO, Howard County, MO, Knox County, MO, Lewis County, MO, Lincoln County, MO, Macon County, MO, Marion County, MO, Moniteau County, MO, Monroe County, MO, Montgomery County, MO, Osage County, MO, Pike County, MO, Ralls County, MO, Randolph County, MO, Saint Charles County, MO, Schuyler County, MO, Scotland County, MO, Shelby County, MO, Warren County, MO

The radar

The St Louis radar (KLSX), 144 km from the middle of the area, began a volume at 08:33 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 00:00Z, 8.5 hours before the alert went out and 204 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: 95 J/kg
Mixed-layer CIN: -159 J/kg
Mixed-layer LCL: 671 m above ground
0-6 km bulk shear: 50 kt
0-1 km storm-relative helicity: 151 m²/s²
0-3 km storm-relative helicity: 261 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
May 28, 5:52 PM CDT	Mesoscale Discussion	SPC	Adams, Hancock, Henderson, McDonough	83 min
May 27, 9:07 PM CDT	Mesoscale Discussion	SPC	Fremont, Page, Ringgold, Taylor	53 min
May 27, 9:31 PM CDT	Severe Thunderstorm Watch	SPC	Decatur, Fremont, Page, Ringgold, Taylor	7 hr
May 28, 1:37 PM CDT	Mesoscale Discussion	SPC	Adair, Adams, Appanoose, Benton, Cass, Cedar and 39 more	113 min
May 28, 2:23 PM CDT	Tornado Watch	SPC	Appanoose, Clarke, Davis, Decatur, Des Moines, Fremont and 20 more	8 hr
May 27, 11:19 PM CDT	Mesoscale Discussion	SPC	Adair, Andrew, Atchison, Buchanan, Caldwell, Carroll and 24 more	116 min

Nearby

Mesoscale Discussions in Missouri, 2013 Mesoscale Discussions in Illinois, 2013 Mesoscale Discussions in Iowa, 2013 Every mesoscale discussion in 2013

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.