Alert archive / Indiana / Mesoscale Discussions in 2004

Mesoscale Discussion 1760

July 22, 200416 counties in Illinois; 40 counties in Indiana

The Storm Prediction Center issued this mesoscale discussion at Jul 22, 2004, 11:59 AM CDT for 16 counties in Illinois; 40 counties in Indiana. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued: Jul 22, 2004, 11:59 AM CDT (16:59 UTC)
Expired: Jul 22, 2004, 2:00 PM CDT
In force: 2 hr
Issued by: the Storm Prediction Center

All 56 counties

Champaign County, IL, DeWitt County, IL, Ford County, IL, Grundy County, IL, Iroquois County, IL, Kankakee County, IL, Kendall County, IL, LaSalle County, IL, Livingston County, IL, Marshall County, IL, McLean County, IL, Piatt County, IL, Putnam County, IL, Vermilion County, IL, Will County, IL, Woodford County, IL, Adams County, IN, Allen County, IN, Benton County, IN, Blackford County, IN, Boone County, IN, Carroll County, IN, Cass County, IN, Clinton County, IN, DeKalb County, IN, Delaware County, IN, Fountain County, IN, Fulton County, IN, Grant County, IN, Hamilton County, IN, Henry County, IN, Howard County, IN, Huntington County, IN, Jasper County, IN, Jay County, IN, Kosciusko County, IN, Lake County, IN, LaPorte County, IN, Madison County, IN, Marshall County, IN, Miami County, IN, Montgomery County, IN, Newton County, IN, Noble County, IN, Porter County, IN, Pulaski County, IN, Randolph County, IN, Starke County, IN, Tippecanoe County, IN, Tipton County, IN, Vermillion County, IN, Wabash County, IN, Warren County, IN, Wells County, IN, White County, IN, Whitley County, IN

The radar

The Chicago radar (KLOT), 106 km from the middle of the area, began a volume at 16:59 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

Lincoln, IL (KILX), launched 12:00Z, 5.0 hours before the alert went out and 128 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: 1619 J/kg
Mixed-layer CIN: -123 J/kg
Mixed-layer LCL: 917 m above ground
0-6 km bulk shear: 28 kt
0-1 km storm-relative helicity: 32 m²/s²
0-3 km storm-relative helicity: 1 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.3

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
Jul 22, 12:20 PM CDT	Severe Thunderstorm Watch	SPC	Bureau, Champaign, Coles, Cook, DeKalb, DeWitt and 24 more	6 hr
Jul 22, 1:52 PM CDT	Mesoscale Discussion	SPC	Champaign, Clark, Coles, Crawford, Cumberland, Douglas and 10 more	83 min
Jul 22, 3:05 PM CDT	Severe Thunderstorm Watch	SPC	Champaign, Clark, Clay, Coles, Crawford, Cumberland and 20 more	6 hr
Jul 22, 6:08 PM CDT	Mesoscale Discussion	SPC	Jersey, Madison, Monroe, Saint Clair	97 min
Jul 22, 6:42 PM CDT	Mesoscale Discussion	SPC	Edwards, Franklin, Gallatin, Hamilton, Hardin, Jefferson and 9 more	93 min
Jul 21, 7:49 PM CDT	Mesoscale Discussion	SPC	Adams, Allen, Benton, Blackford, Boone, Carroll and 41 more	56 min
Jul 21, 9:16 PM CDT	Mesoscale Discussion	SPC	Adams, Bartholomew, Blackford, Brown, Clay, Dearborn and 21 more	59 min
Jul 22, 3:45 PM CDT	Severe Thunderstorm Watch	SPC	Spencer	5 hr

Nearby

Mesoscale Discussions in Indiana, 2004 Mesoscale Discussions in Illinois, 2004 Every 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; radar from the NEXRAD Level II archive.