Alert archive / Illinois / Mesoscale Discussions in 2015

Mesoscale Discussion 1182

June 25, 201521 counties in Illinois; 18 counties in Missouri

The Storm Prediction Center issued this mesoscale discussion at Jun 25, 2015, 7:27 PM CDT for 21 counties in Illinois; 18 counties in Missouri. It was in force for 93 min.

The area

The outline as issued.

The facts

Issued: Jun 25, 2015, 7:27 PM CDT (00:27 UTC)
Expired: Jun 25, 2015, 9:00 PM CDT
In force: 93 min
Issued by: the Storm Prediction Center

All 39 counties

Bond County, IL, Calhoun County, IL, Clay County, IL, Clinton County, IL, Fayette County, IL, Franklin County, IL, Greene County, IL, Hamilton County, IL, Jefferson County, IL, Jersey County, IL, Macoupin County, IL, Madison County, IL, Marion County, IL, Monroe County, IL, Montgomery County, IL, Perry County, IL, Randolph County, IL, Saint Clair County, IL, Washington County, IL, Wayne County, IL, White County, IL, Audrain County, MO, Boone County, MO, Callaway County, MO, City of Saint Louis, MO, Cooper County, MO, Franklin County, MO, Gasconade County, MO, Jefferson County, MO, Lincoln County, MO, Moniteau County, MO, Montgomery County, MO, Osage County, MO, Pettis County, MO, Pike County, MO, Ralls County, MO, Saint Charles County, MO, Saint Louis County, MO, Warren County, MO

The radar

The St Louis radar (KLSX), 19 km from the middle of the area, began a volume at 00:27 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

Lincoln, IL (KILX), launched 00:00Z, 0.5 hours before the alert went out and 248 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: 239 J/kg
Mixed-layer CIN: -194 J/kg
Mixed-layer LCL: 1150 m above ground
0-6 km bulk shear: 42 kt
0-1 km storm-relative helicity: -8 m²/s²
0-3 km storm-relative helicity: 125 m²/s²
Significant tornado parameter: -0.0
Supercell composite: -0.2

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 25, 10:05 PM CDT	Mesoscale Discussion	SPC	Clay, Clinton, Edwards, Franklin, Gallatin, Hamilton and 12 more	85 min
Jun 26, 11:50 AM CDT	Mesoscale Discussion	SPC	Alexander, Clay, Crawford, Edwards, Franklin, Gallatin and 20 more	115 min
Jun 26, 12:18 PM CDT	Severe Thunderstorm Watch	SPC	Alexander, Edwards, Franklin, Gallatin, Hamilton, Hardin and 13 more	7 hr
Jun 26, 3:16 PM CDT	Mesoscale Discussion	SPC	Hardin, Massac, Pope	89 min
Jun 25, 9:06 PM CDT	Mesoscale Discussion	SPC	Andrew, Boone, Buchanan, Caldwell, Carroll, Clay and 13 more	84 min
Jun 25, 11:33 PM CDT	Mesoscale Discussion	SPC	Buchanan, Cass, Clay, Clinton, Henry, Jackson and 4 more	87 min
Jun 26, 1:46 AM CDT	Mesoscale Discussion	SPC	Barton, Bates, Benton, Camden, Cass, Cedar and 17 more	59 min
Jun 26, 2:18 AM CDT	Severe Thunderstorm Watch	SPC	Barton, Bates, Benton, Camden, Cass, Cedar and 18 more	3 hr
Jun 26, 4:21 AM CDT	Mesoscale Discussion	SPC	Barton, Benton, Camden, Cedar, Christian, Dade and 17 more	84 min

Nearby

Mesoscale Discussions in Illinois, 2015 Mesoscale Discussions in Missouri, 2015 Every mesoscale discussion in 2015

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.