Alert archive / Indiana / Mesoscale Discussions in 2014

Mesoscale Discussion 574

May 11, 20145 counties in Illinois; 10 counties in Indiana

The Storm Prediction Center issued this mesoscale discussion at May 11, 2014, 8:32 PM CDT for 5 counties in Illinois; 10 counties in Indiana. It was in force for 58 min.

The area

The outline as issued.

The facts

Issued: May 11, 2014, 8:32 PM CDT (01:32 UTC)
Expired: May 11, 2014, 9:30 PM CDT
In force: 58 min
Issued by: the Storm Prediction Center

Counties DeWitt County, IL, Ford County, IL, Iroquois County, IL, Livingston County, IL, McLean County, IL, Benton County, IN, Carroll County, IN, Cass County, IN, Howard County, IN, Jasper County, IN, Newton County, IN, Pulaski County, IN, Tippecanoe County, IN, Warren County, IN, White County, IN

The radar

The Chicago radar (KLOT), 105 km from the middle of the area, began a volume at 01:35 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, 1.5 hours before the alert went out and 69 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: 2685 J/kg
Mixed-layer CIN: -1 J/kg
Mixed-layer LCL: 968 m above ground
0-6 km bulk shear: 34 kt
0-1 km storm-relative helicity: 92 m²/s²
0-3 km storm-relative helicity: 154 m²/s²
Significant tornado parameter: 1.3
Supercell composite: 7.1

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 12, 9:51 AM CDT	Mesoscale Discussion	SPC	Boone, Bureau, Carroll, Cook, DeKalb, DuPage and 13 more	84 min
May 12, 10:02 AM CDT	Severe Thunderstorm Watch	SPC	Boone, Cook, DeKalb, DuPage, Kane, Lake and 4 more	6 hr
May 12, 11:54 AM CDT	Mesoscale Discussion	SPC	Adams, Brown, Bureau, Carroll, Fulton, Hancock and 16 more	2 hr
May 12, 1:00 PM CDT	Severe Thunderstorm Watch	SPC	Adams, Bureau, Carroll, Hancock, Henderson, Henry and 8 more	7 hr
May 12, 1:06 PM CDT	Mesoscale Discussion	SPC	Boone, Cook, DeKalb, DuPage, Kane, Lake and 6 more	54 min
May 12, 3:21 PM CDT	Mesoscale Discussion	SPC	Adams, Hancock, Henderson, Jo Daviess, McDonough, Mercer and 2 more	54 min
May 12, 3:49 PM CDT	Severe Thunderstorm Watch	SPC	Boone, Cook, DeKalb, DuPage, Kane, Kendall and 6 more	7 hr
May 12, 6:56 PM CDT	Mesoscale Discussion	SPC	Boone, Jo Daviess, Lake, McHenry, Stephenson, Winnebago	64 min

Nearby

Mesoscale Discussions in Indiana, 2014 Mesoscale Discussions in Illinois, 2014 Every mesoscale discussion in 2014

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.