Alert archive / Iowa / Mesoscale Discussions in 2005

Mesoscale Discussion 2164

September 8, 2005Mercer County, Illinois; 19 counties in Iowa

The Storm Prediction Center issued this mesoscale discussion at Sep 8, 2005, 12:38 PM CDT for Mercer County, Illinois; 19 counties in Iowa. It was in force for 97 min.

The area

The outline as issued.

The facts

Issued: Sep 8, 2005, 12:38 PM CDT (17:38 UTC)
Expired: Sep 8, 2005, 2:15 PM CDT
In force: 97 min
Issued by: the Storm Prediction Center

Counties Des Moines County, IA, Henry County, IA, Iowa County, IA, Jasper County, IA, Jefferson County, IA, Johnson County, IA, Keokuk County, IA, Louisa County, IA, Mahaska County, IA, Marion County, IA, Marshall County, IA, Monroe County, IA, Muscatine County, IA, Polk County, IA, Poweshiek County, IA, Story County, IA, Wapello County, IA, Warren County, IA, Washington County, IA, Mercer County, IL

The radar

The Des Moines radar (KDMX), 130 km from the middle of the area, began a volume at 17:39 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 775Sep 8, 1:10 PM CDT

The nearest sounding before it

Davenport, (KDVN), launched 12:00Z, 5.6 hours before the alert went out and 141 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: 47 J/kg
Mixed-layer CIN: -223 J/kg
Mixed-layer LCL: 1125 m above ground
0-6 km bulk shear: 19 kt
0-1 km storm-relative helicity: 77 m²/s²
0-3 km storm-relative helicity: 68 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
Sep 8, 1:10 PM CDT	Severe Thunderstorm Watch	SPC	Adams, Brown, Cass, Fulton, Hancock, Henderson and 12 more	6 hr
Sep 8, 2:40 PM CDT	Mesoscale Discussion	SPC	Adams, Brown, Cass, DeWitt, Fulton, Hancock and 22 more	95 min
Sep 8, 5:17 PM CDT	Mesoscale Discussion	SPC	Brown, Cass, Christian, Coles, DeWitt, Douglas and 19 more	88 min
Sep 8, 1:59 AM CDT	Mesoscale Discussion	SPC	Clay, Dickinson, Emmet, Lyon, O'Brien, Osceola and 1 more	3 hr
Sep 8, 6:08 AM CDT	Mesoscale Discussion	SPC	Boone, Buena Vista, Calhoun, Cerro Gordo, Cherokee, Clay and 18 more	3 hr
Sep 8, 9:40 AM CDT	Severe Thunderstorm Watch	SPC	Adair, Audubon, Boone, Buena Vista, Butler, Calhoun and 34 more	5 hr
Sep 8, 10:56 AM CDT	Mesoscale Discussion	SPC	Boone, Calhoun, Greene, Hamilton, Hardin, Humboldt and 6 more	64 min

Nearby

Mesoscale Discussions in Iowa, 2005 Mesoscale Discussions in Illinois, 2005 Every mesoscale discussion in 2005

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.