Alert archive / Michigan / Mesoscale Discussions in 2003

Mesoscale Discussion 1909

July 20, 2003Steuben County, Indiana; 12 counties in Michigan; 5 counties in Ohio

The Storm Prediction Center issued this mesoscale discussion at Jul 20, 2003, 12:41 PM EST for Steuben County, Indiana; 12 counties in Michigan; 5 counties in Ohio. It was in force for 64 min.

The area

The outline as issued.

The facts

Issued: Jul 20, 2003, 12:41 PM EST (17:41 UTC)
Expired: Jul 20, 2003, 1:45 PM EST
In force: 64 min
Issued by: the Storm Prediction Center

Counties Steuben County, IN, Barry County, MI, Branch County, MI, Calhoun County, MI, Eaton County, MI, Hillsdale County, MI, Ingham County, MI, Jackson County, MI, Kalamazoo County, MI, Lenawee County, MI, Monroe County, MI, Washtenaw County, MI, Wayne County, MI, Fulton County, OH, Henry County, OH, Lucas County, OH, Williams County, OH, Wood County, OH

The radar

The Detroit radar (KDTX), 108 km from the middle of the area, began a volume at 17:44 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.

Severe Thunderstorm Watch 771Jul 20, 1:20 PM EST

The nearest sounding before it

Detroit, MI (KDTX), launched 12:00Z, 5.7 hours before the alert went out and 112 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 1593 m above ground
0-6 km bulk shear: 31 kt
0-1 km storm-relative helicity: 92 m²/s²
0-3 km storm-relative helicity: 118 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

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 20, 1:20 PM EST	Severe Thunderstorm Watch	SPC	DeKalb, Steuben	6 hr
Jul 20, 3:37 PM EST	Mesoscale Discussion	SPC	Steuben	113 min
Jul 20, 4:25 PM EST	Severe Thunderstorm Watch	SPC	Jasper, Lake, Newton, Porter	5 hr
Jul 20, 6:23 PM EST	Mesoscale Discussion	SPC	Elkhart, Fulton, Jasper, Kosciusko, LaGrange, Lake and 10 more	97 min
Jul 20, 6:45 PM EST	Severe Thunderstorm Watch	SPC	DeKalb, Elkhart, Kosciusko, LaGrange, LaPorte, Marshall and 5 more	5 hr
Jul 20, 1:16 PM EST	Mesoscale Discussion	SPC	Alger, Baraga, Dickinson, Gogebic, Houghton, Iron and 3 more	119 min
Jul 20, 1:55 PM EST	Severe Thunderstorm Watch	SPC	Alger, Baraga, Delta, Dickinson, Gogebic, Houghton and 4 more	7 hr
Jul 20, 3:27 PM EST	Mesoscale Discussion	SPC	Alger, Baraga, Delta, Dickinson, Gogebic, Houghton and 4 more	63 min
Jul 20, 6:47 PM EST	Mesoscale Discussion	SPC	Baraga, Delta, Dickinson, Gogebic, Houghton, Iron and 3 more	88 min

Nearby

Mesoscale Discussions in Michigan, 2003 Mesoscale Discussions in Ohio, 2003 Mesoscale Discussions in Indiana, 2003 Every mesoscale discussion in 2003

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.