Alert archive / Missouri / Mesoscale Discussions in 2011

Mesoscale Discussion 824

May 20, 20114 states

The Storm Prediction Center issued this mesoscale discussion at May 20, 2011, 9:11 AM CDT for 4 states. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued
May 20, 2011, 9:11 AM CDT (14:11 UTC)
Expired
May 20, 2011, 11:15 AM CDT
In force
2 hr
Issued by
the Storm Prediction Center
All 46 counties

Benton County, AR, Washington County, AR, Allen County, KS, Anderson County, KS, Bourbon County, KS, Cherokee County, KS, Crawford County, KS, Douglas County, KS, Franklin County, KS, Jefferson County, KS, Johnson County, KS, Labette County, KS, Leavenworth County, KS, Linn County, KS, Miami County, KS, Neosho County, KS, Wyandotte County, KS, Barry County, MO, Barton County, MO, Bates County, MO, Buchanan County, MO, Caldwell County, MO, Carroll County, MO, Cass County, MO, Cedar County, MO, Clay County, MO, Clinton County, MO, Dade County, MO, Daviess County, MO, DeKalb County, MO, Henry County, MO, Jackson County, MO, Jasper County, MO, Johnson County, MO, Lafayette County, MO, Lawrence County, MO, McDonald County, MO, Newton County, MO, Platte County, MO, Polk County, MO, Ray County, MO, St. Clair County, MO, Vernon County, MO, Craig County, OK, Delaware County, OK, Ottawa County, OK

The radar

The Pleasant Hill radar (KEAX), 82 km from the middle of the area, began a volume at 14:14 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

Springfield, MO (KSGF), launched 12:00Z, 2.2 hours before the alert went out and 139 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, Springfield, MO at 12:00Z on 2011-05-20Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 537 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, Springfield, MO at 12:00Z on 2011-05-20The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 222 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
537 J/kg
Mixed-layer CIN
-280 J/kg
Mixed-layer LCL
940 m above ground
0-6 km bulk shear
33 kt
0-1 km storm-relative helicity
222 m²/s²
0-3 km storm-relative helicity
161 m²/s²
Significant tornado parameter
0.0
Supercell composite
1.6

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.

IssuedProductOfficeCountiesLasted
May 20, 10:30 AM CDTMesoscale DiscussionSPCArkansas, Baxter, Boone, Bradley, Calhoun, Carroll and 53 more60 min
May 20, 11:03 AM CDTTornado WatchSPCClark, Columbia, Conway, Crawford, Dallas, Franklin and 26 more7 hr
May 20, 1:28 PM CDTMesoscale DiscussionSPCBaxter, Boone, Calhoun, Carroll, Clark, Cleburne and 47 more62 min
May 20, 4:00 PM CDTMesoscale DiscussionSPCCalhoun, Clark, Columbia, Conway, Dallas, Faulkner and 24 more60 min
May 20, 5:56 PM CDTTornado WatchSPCClark, Columbia, Dallas, Garland, Grant, Hempstead and 16 more3 hr
May 19, 8:17 PM CDTMesoscale DiscussionSPCBarber, Barton, Clark, Clay, Cloud, Comanche and 29 more118 min
May 19, 8:46 PM CDTTornado WatchSPCBarber, Barton, Clark, Clay, Cloud, Comanche and 34 more6 hr
May 19, 11:13 PM CDTMesoscale DiscussionSPCBarber, Barton, Clark, Clay, Cloud, Comanche and 29 more2 hr
May 20, 1:52 PM CDTMesoscale DiscussionSPCBarber, Barton, Comanche, Edwards, Ellsworth, Jewell and 11 more113 min
May 20, 2:32 PM CDTSevere Thunderstorm WatchSPCBarber, Barton, Clark, Clay, Cloud, Comanche and 30 more7 hr
May 20, 6:01 PM CDTMesoscale DiscussionSPCBarber, Barton, Clay, Cloud, Comanche, Edwards and 27 more59 min
May 19, 7:47 PM CDTMesoscale DiscussionSPCCaddo, Canadian, Comanche, Cotton, Grady, Kiowa and 1 more118 min
May 19, 11:39 PM CDTSevere Thunderstorm WatchSPCHarmon, Jackson, Tillman6 hr
May 20, 2:58 AM CDTMesoscale DiscussionSPCComanche, Jackson, Kiowa, Tillman, Washita92 min

Nearby

Mesoscale Discussions in Missouri, 2011Mesoscale Discussions in Kansas, 2011Mesoscale Discussions in Oklahoma, 2011Every mesoscale discussion in 2011

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.