Alert archive / Illinois / Mesoscale Discussions in 2013

Mesoscale Discussion 889

May 30, 201362 counties in Illinois; Perry County, City of Saint Louis, Missouri

The Storm Prediction Center issued this mesoscale discussion at May 30, 2013, 7:04 PM CDT for 62 counties in Illinois; Perry County, City of Saint Louis, Missouri. It was in force for 56 min.

The area

The outline as issued.

The facts

Issued: May 30, 2013, 7:04 PM CDT (00:04 UTC)
Expired: May 30, 2013, 8:00 PM CDT
In force: 56 min
Issued by: the Storm Prediction Center

All 64 counties

Bond County, IL, Boone County, IL, Calhoun County, IL, Champaign County, IL, Christian County, IL, Clark County, IL, Clay County, IL, Clinton County, IL, Coles County, IL, Crawford County, IL, Cumberland County, IL, DeKalb County, IL, DeWitt County, IL, Douglas County, IL, Edgar County, IL, Edwards County, IL, Effingham County, IL, Fayette County, IL, Franklin County, IL, Greene County, IL, Hamilton County, IL, Jackson County, IL, Jasper County, IL, Jefferson County, IL, Jersey County, IL, Johnson County, IL, LaSalle County, IL, Lawrence County, IL, Livingston County, IL, Logan County, IL, Macon County, IL, Macoupin County, IL, Madison County, IL, Marion County, IL, Marshall County, IL, Mason County, IL, McLean County, IL, Menard County, IL, Monroe County, IL, Montgomery County, IL, Morgan County, IL, Moultrie County, IL, Perry County, IL, Piatt County, IL, Putnam County, IL, Randolph County, IL, Richland County, IL, Saint Clair County, IL, Saline County, IL, Sangamon County, IL, Scott County, IL, Shelby County, IL, Tazewell County, IL, Union County, IL, Vermilion County, IL, Wabash County, IL, Washington County, IL, Wayne County, IL, White County, IL, Williamson County, IL, Winnebago County, IL, Woodford County, IL, City of Saint Louis, MO, Perry County, MO

The radar

The Lincoln radar (KILX), 39 km from the middle of the area, began a volume at 00:07 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 257May 30, 7:35 PM CDT

The nearest sounding before it

Lincoln, IL (KILX), launched 00:00Z, 0.1 hours before the alert went out and 50 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: 596 J/kg
Mixed-layer CIN: -54 J/kg
Mixed-layer LCL: 1317 m above ground
0-6 km bulk shear: 33 kt
0-1 km storm-relative helicity: 122 m²/s²
0-3 km storm-relative helicity: 151 m²/s²
Significant tornado parameter: 0.2
Supercell composite: 2.6

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 30, 7:38 PM CDT	Severe Thunderstorm Watch	SPC	Champaign, Christian, Clark, Clay, Coles, Crawford and 12 more	5 hr
May 30, 10:03 PM CDT	Mesoscale Discussion	SPC	Champaign, Clark, Clay, Coles, Cook, Crawford and 11 more	87 min
May 31, 8:45 AM CDT	Mesoscale Discussion	SPC	Bond, Calhoun, Clinton, Greene, Jersey, Macoupin and 5 more	90 min
May 31, 5:21 PM CDT	Mesoscale Discussion	SPC	Calhoun, Christian, Greene, Jersey, Logan, Macoupin and 4 more	54 min
May 31, 5:45 PM CDT	Tornado Watch	SPC	Bond, Calhoun, Clinton, Fayette, Greene, Jersey and 8 more	4 hr
May 30, 7:41 PM CDT	Mesoscale Discussion	SPC	Atchison	2 hr
May 30, 8:46 PM CDT	Tornado Watch	SPC	Dunklin, Pemiscot	7 hr
May 31, 1:57 AM CDT	Mesoscale Discussion	SPC	Butler, Carter, Oregon, Ripley	93 min
May 31, 2:05 AM CDT	Mesoscale Discussion	SPC	Buchanan, Clay, Clinton, Jackson, Platte, Ray	85 min
May 31, 2:44 AM CDT	Severe Thunderstorm Watch	SPC	Buchanan, Caldwell, Carroll, Cass, Chariton, Clay and 14 more	5 hr
May 31, 4:51 AM CDT	Mesoscale Discussion	SPC	Caldwell, Carroll, Cass, Chariton, Clay, Clinton and 11 more	114 min
May 31, 7:03 AM CDT	Mesoscale Discussion	SPC	Cass, Cooper, Howard, Johnson, Pettis	57 min
May 31, 1:49 PM CDT	Mesoscale Discussion	SPC	Barry, Barton, Bates, Benton, Camden, Cass and 29 more	116 min
May 31, 2:15 PM CDT	Tornado Watch	SPC	Barry, Barton, Bates, Benton, Boone, Callaway and 30 more	8 hr

Nearby

Mesoscale Discussions in Illinois, 2013 Mesoscale Discussions in Missouri, 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.