Alert archive / Missouri / Mesoscale Discussions in 2024

Mesoscale Discussion 929

May 24, 202411 counties in Illinois; 35 counties in Missouri

The Storm Prediction Center issued this mesoscale discussion at May 24, 2024, 11:57 AM CDT for 11 counties in Illinois; 35 counties in Missouri. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued
May 24, 2024, 11:57 AM CDT (16:57 UTC)
Expired
May 24, 2024, 2:00 PM CDT
In force
2 hr
Issued by
the Storm Prediction Center
Concerning
Severe potential...watch possible
Chance of a watch
60%
All 46 counties

Adams County, IL, Brown County, IL, Calhoun County, IL, Cass County, IL, Greene County, IL, Hancock County, IL, Jersey County, IL, Morgan County, IL, Pike County, IL, Schuyler County, IL, Scott County, IL, Adair County, MO, Audrain County, MO, Boone County, MO, Caldwell County, MO, Callaway County, MO, Carroll County, MO, Chariton County, MO, Clark County, MO, Cooper County, MO, Daviess County, MO, Grundy County, MO, Howard County, MO, Johnson County, MO, Knox County, MO, Lafayette County, MO, Lewis County, MO, Lincoln County, MO, Linn County, MO, Livingston County, MO, Macon County, MO, Marion County, MO, Moniteau County, MO, Monroe County, MO, Montgomery County, MO, Pettis County, MO, Pike County, MO, Ralls County, MO, Randolph County, MO, Ray County, MO, Saint Charles County, MO, Saline County, MO, Scotland County, MO, Shelby County, MO, Sullivan County, MO, Warren County, MO

The radar

The St Louis radar (KLSX), 175 km from the middle of the area, began a volume at 17:00 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.

The nearest sounding before it

Davenport, (KDVN), launched 12:00Z, 5.0 hours before the alert went out and 286 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-pSkew-T log-p diagram, Davenport, at 12:00Z on 2024-05-24Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1392 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Davenport, at 12:00Z on 2024-05-24The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 167 square meters per square second.193958Sfc1 km3 km6 km9 kmRMLM
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
1392 J/kg
Mixed-layer CIN
-56 J/kg
Mixed-layer LCL
771 m above ground
0-6 km bulk shear
47 kt
0-1 km storm-relative helicity
167 m²/s²
0-3 km storm-relative helicity
148 m²/s²
Significant tornado parameter
0.9
Supercell composite
5.9

Open this sounding in Storm Lab

The text

As transmitted.

<!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.

IssuedProductOfficeCountiesLasted
May 24, 6:07 AM CDTSevere Thunderstorm WatchSPCBoone, Bureau, Carroll, Cook, DeKalb, DuPage and 33 more9 hr
May 24, 8:44 AM CDTMesoscale DiscussionSPCBoone, Bureau, Carroll, DeKalb, Jo Daviess, Kane and 9 more2 hr
May 24, 1:39 PM CDTMesoscale DiscussionSPCBond, Christian, Clark, Coles, Cumberland, Douglas and 12 more2 hr
May 24, 2:39 PM CDTSevere Thunderstorm WatchSPCAdams, Bond, Brown, Calhoun, Cass, Christian and 31 more10 hr
May 24, 3:57 PM CDTMesoscale DiscussionSPCBond, Brown, Calhoun, Cass, Christian, Clay and 34 more93 min
May 24, 4:46 PM CDTMesoscale DiscussionSPCBoone, Bureau, Carroll, Cook, DeKalb, DuPage and 15 more119 min
May 24, 6:19 PM CDTMesoscale DiscussionSPCBond, Calhoun, Christian, Clinton, Effingham, Fayette and 10 more116 min
May 24, 1:15 AM CDTMesoscale DiscussionSPCAndrew, Atchison, Buchanan, Caldwell, Clinton, Daviess and 13 more2 hr
May 24, 1:33 AM CDTSevere Thunderstorm WatchSPCAtchison, Holt, Nodaway4 hr
May 24, 2:44 AM CDTSevere Thunderstorm WatchSPCAdair, Clark, Gentry, Grundy, Harrison, Mercer and 5 more7 hr
May 24, 3:54 AM CDTMesoscale DiscussionSPCAtchison, Gentry, Harrison, Holt, Mercer, Nodaway and 3 more2 hr
May 24, 5:17 AM CDTMesoscale DiscussionSPCAdair, Andrew, Clark, Daviess, DeKalb, Gentry and 10 more118 min
May 24, 3:42 PM CDTMesoscale DiscussionSPCBarry, Barton, Benton, Camden, Cedar, Christian and 22 more2 hr
May 24, 4:29 PM CDTSevere Thunderstorm WatchSPCBarry, Barton, Benton, Camden, Cedar, Christian and 28 more9 hr

Nearby

Mesoscale Discussions in Missouri, 2024Mesoscale Discussions in Illinois, 2024Every mesoscale discussion in 2024

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.