Alert archive / Illinois / Mesoscale Discussions in 2004

Mesoscale Discussion 989

May 30, 20044 states

The Storm Prediction Center issued this mesoscale discussion at May 30, 2004, 10:04 AM CDT for 4 states. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued
May 30, 2004, 10:04 AM CDT (15:04 UTC)
Expired
May 30, 2004, 12:30 PM CDT
In force
2 hr
Issued by
the Storm Prediction Center
All 59 counties

Alexander County, IL, Clay County, IL, Clinton County, IL, Edwards County, IL, Franklin County, IL, Gallatin County, IL, Hamilton County, IL, Hardin County, IL, Jackson County, IL, Jefferson County, IL, Johnson County, IL, Marion County, IL, Massac County, IL, Perry County, IL, Pope County, IL, Pulaski County, IL, Randolph County, IL, Richland County, IL, Saline County, IL, Union County, IL, Wabash County, IL, Washington County, IL, Wayne County, IL, White County, IL, Williamson County, IL, Gibson County, IN, Pike County, IN, Posey County, IN, Spencer County, IN, Vanderburgh County, IN, Warrick County, IN, Ballard County, KY, Butler County, KY, Caldwell County, KY, Calloway County, KY, Carlisle County, KY, Christian County, KY, Crittenden County, KY, Daviess County, KY, Graves County, KY, Henderson County, KY, Hickman County, KY, Hopkins County, KY, Livingston County, KY, Logan County, KY, Lyon County, KY, Marshall County, KY, McCracken County, KY, McLean County, KY, Muhlenberg County, KY, Ohio County, KY, Todd County, KY, Trigg County, KY, Union County, KY, Webster County, KY, Cape Girardeau County, MO, Mississippi County, MO, Perry County, MO, Scott County, MO

The watches that followed

Watches SPC issued over any of the same counties within four hours of this discussion.

The nearest sounding before it

Nashville Metro, TN (KBNA), launched 12:00Z, 3.1 hours before the alert went out and 254 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, Nashville Metro, TN at 12:00Z on 2004-05-30Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1413 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, Nashville Metro, TN at 12:00Z on 2004-05-30The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 210 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
1413 J/kg
Mixed-layer CIN
-31 J/kg
Mixed-layer LCL
702 m above ground
0-6 km bulk shear
41 kt
0-1 km storm-relative helicity
210 m²/s²
0-3 km storm-relative helicity
176 m²/s²
Significant tornado parameter
0.0
Supercell composite
6.2

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 30, 7:40 AM CDTTornado WatchSPCAdams, Brown, Cass, Champaign, Christian, Coles and 31 more5 hr
May 30, 9:40 AM CDTMesoscale DiscussionSPCAdams, Brown, Calhoun, Cass, Greene, Hancock and 6 more3 hr
May 30, 10:50 AM CDTTornado WatchSPCAdams, Brown, Hancock, McDonough, Pike8 hr
May 30, 11:04 AM CDTMesoscale DiscussionSPCChampaign, Cook, DeWitt, Douglas, DuPage, Iroquois and 4 more116 min
May 30, 11:50 AM CDTTornado WatchSPCClark, Crawford, Edgar, Edwards, Gallatin, Hardin and 7 more7 hr
May 30, 12:13 PM CDTMesoscale DiscussionSPCCarroll, Hancock, Henderson, Henry, Jo Daviess, Knox and 4 more2 hr
May 30, 12:25 PM CDTTornado WatchSPCBureau, Carroll, Henderson, Henry, Jo Daviess, Knox and 8 more7 hr
May 30, 12:53 PM CDTMesoscale DiscussionSPCAdams, Brown, Calhoun, Cass, Christian, Fulton and 13 more2 hr
May 30, 1:05 PM CDTTornado WatchSPCAlexander, Bond, Calhoun, Cass, Champaign, Christian and 45 more6 hr
May 30, 3:16 PM CDTMesoscale DiscussionSPCBoone, Bureau, Carroll, Cass, DeKalb, DuPage and 29 more119 min
May 30, 4:25 PM CDTTornado WatchSPCBoone, Cook, DeKalb, DuPage, Grundy, Iroquois and 12 more6 hr
May 30, 5:10 PM CDTMesoscale DiscussionSPCAlexander, Bond, Clinton, Fayette, Jackson, Madison and 7 more95 min
May 30, 5:36 PM CDTMesoscale DiscussionSPCBoone, Bureau, Carroll, Cass, Champaign, Christian and 39 more54 min
May 30, 6:40 PM CDTTornado WatchSPCAlexander, Bond, Champaign, Christian, Clark, Clay and 41 more6 hr
May 30, 6:55 PM CDTTornado WatchSPCGallatin, Hardin, Lawrence, Wabash8 hr
May 30, 3:05 PM CDTMesoscale DiscussionSPCBartholomew, Blackford, Boone, Brown, Clark, Crawford and 47 more115 min
May 30, 3:55 PM CDTTornado WatchSPCAdams, Dearborn, Ohio, Switzerland, Union, Wayne5 hr
May 30, 11:50 AM CDTMesoscale DiscussionSPCAnderson, Bath, Bell, Bourbon, Boyle, Bracken and 54 more115 min
May 30, 1:40 PM CDTTornado WatchSPCAdair, Anderson, Barren, Bath, Bell, Bourbon and 67 more7 hr
May 30, 3:20 PM CDTTornado WatchSPCCalloway, Fulton8 hr
May 29, 8:45 PM CDTMesoscale DiscussionSPCAndrew, Atchison, Buchanan, Clay, Clinton, DeKalb and 5 more60 min
May 29, 9:35 PM CDTTornado WatchSPCAndrew, Atchison, Buchanan, Caldwell, Cass, Clay and 13 more6 hr
May 29, 11:23 PM CDTMesoscale DiscussionSPCAndrew, Atchison, Buchanan, Caldwell, Clay, Clinton and 10 more67 min
May 30, 2:38 AM CDTMesoscale DiscussionSPCAndrew, Buchanan, Caldwell, Cass, Clay, Clinton and 17 more97 min
May 30, 2:44 PM CDTMesoscale DiscussionSPCBollinger, Butler, Cape Girardeau, Carter, Christian, Crawford and 26 more2 hr

Nearby

Mesoscale Discussions in Illinois, 2004Mesoscale Discussions in Kentucky, 2004Mesoscale Discussions in Indiana, 2004Every mesoscale discussion in 2004

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.