Alert archive / Missouri / Mesoscale Discussions in 2009

Mesoscale Discussion 837

May 15, 20094 counties in Illinois; 4 counties in Kansas; 38 counties in Missouri

The Storm Prediction Center issued this mesoscale discussion at May 15, 2009, 3:43 PM CDT for 4 counties in Illinois; 4 counties in Kansas; 38 counties in Missouri. It was in force for 62 min.

The area

The outline as issued.

The facts

Issued
May 15, 2009, 3:43 PM CDT (20:43 UTC)
Expired
May 15, 2009, 4:45 PM CDT
In force
62 min
Issued by
the Storm Prediction Center
All 46 counties

Adams County, IL, Brown County, IL, Calhoun County, IL, Pike County, IL, Atchison County, KS, Johnson County, KS, Leavenworth County, KS, Wyandotte County, KS, Adair County, MO, Andrew County, MO, Audrain County, MO, Boone County, MO, Buchanan County, MO, Caldwell County, MO, Callaway County, MO, Carroll County, MO, Chariton County, MO, Clay County, MO, Clinton County, MO, Cooper County, MO, Daviess County, MO, DeKalb County, MO, Grundy County, MO, Howard County, MO, Jackson 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, Platte County, MO, Ralls County, MO, Randolph County, MO, Ray County, MO, Saline County, MO, Shelby County, MO, Sullivan County, MO, Warren County, MO

The radar

The Pleasant Hill radar (KEAX), 125 km from the middle of the area, began a volume at 20:44 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

Topeka, KS (KTOP), launched 12:00Z, 8.7 hours before the alert went out and 235 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, Topeka, KS at 12:00Z on 2009-05-15Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1293 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, Topeka, KS at 12:00Z on 2009-05-15The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 302 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
1293 J/kg
Mixed-layer CIN
-112 J/kg
Mixed-layer LCL
590 m above ground
0-6 km bulk shear
31 kt
0-1 km storm-relative helicity
302 m²/s²
0-3 km storm-relative helicity
313 m²/s²
Significant tornado parameter
0.0
Supercell composite
13.7

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 15, 12:50 PM CDTTornado WatchSPCAdams, Brown, Calhoun, Pike7 hr
May 15, 2:05 PM CDTMesoscale DiscussionSPCCass, Champaign, Christian, Coles, Cumberland, DeWitt and 23 more25 min
May 15, 2:39 PM CDTTornado WatchSPCBond, Cass, Champaign, Christian, Clinton, Coles and 33 more7 hr
May 15, 5:31 PM CDTMesoscale DiscussionSPCAdams, Bond, Brown, Calhoun, Cass, Champaign and 39 more119 min
May 15, 6:30 PM CDTSevere Thunderstorm WatchSPCRandolph6 hr
May 15, 2:03 AM CDTMesoscale DiscussionSPCAtchison, Brown, Clay, Cloud, Dickinson, Doniphan and 17 more87 min
May 15, 7:14 AM CDTMesoscale DiscussionSPCAtchison, Brown, Doniphan, Jackson, Marshall, Nemaha and 3 more91 min
May 15, 7:42 AM CDTSevere Thunderstorm WatchSPCAtchison, Brown, Clay, Cloud, Doniphan, Douglas and 18 more5 hr
May 15, 11:48 AM CDTMesoscale DiscussionSPCAtchison, Brown, Doniphan, Marshall, Nemaha57 min
May 15, 2:44 PM CDTMesoscale DiscussionSPCAnderson, Barber, Butler, Chase, Coffey, Comanche and 24 more31 min
May 15, 3:01 PM CDTMesoscale DiscussionSPCJefferson, Leavenworth, Shawnee, Wyandotte59 min
May 15, 3:02 PM CDTTornado WatchSPCAllen, Anderson, Barber, Butler, Chase, Chautauqua and 29 more7 hr
May 15, 5:52 PM CDTMesoscale DiscussionSPCAnderson, Butler, Chase, Coffey, Cowley, Elk and 8 more53 min

Nearby

Mesoscale Discussions in Missouri, 2009Mesoscale Discussions in Illinois, 2009Mesoscale Discussions in Kansas, 2009Every mesoscale discussion in 2009

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.