Alert archive / Minnesota / Mesoscale Discussions in 2003

Mesoscale Discussion 462

April 15, 200348 counties in Minnesota; 14 counties in South Dakota; Pierce County, Saint Croix County, Wisconsin

The Storm Prediction Center issued this mesoscale discussion at Apr 15, 2003, 4:07 PM CDT for 48 counties in Minnesota; 14 counties in South Dakota; Pierce County, Saint Croix County, Wisconsin. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued: Apr 15, 2003, 4:07 PM CDT (21:07 UTC)
Expired: Apr 15, 2003, 6:30 PM CDT
In force: 2 hr
Issued by: the Storm Prediction Center

All 64 counties

Anoka County, MN, Benton County, MN, Big Stone County, MN, Blue Earth County, MN, Brown County, MN, Carver County, MN, Chippewa County, MN, Chisago County, MN, Cottonwood County, MN, Dakota County, MN, Dodge County, MN, Douglas County, MN, Goodhue County, MN, Hennepin County, MN, Isanti County, MN, Kanabec County, MN, Kandiyohi County, MN, Lac qui Parle County, MN, Le Sueur County, MN, Lincoln County, MN, Lyon County, MN, McLeod County, MN, Meeker County, MN, Mille Lacs County, MN, Morrison County, MN, Murray County, MN, Nicollet County, MN, Nobles County, MN, Pipestone County, MN, Pope County, MN, Ramsey County, MN, Redwood County, MN, Renville County, MN, Rice County, MN, Rock County, MN, Scott County, MN, Sherburne County, MN, Sibley County, MN, Stearns County, MN, Steele County, MN, Stevens County, MN, Swift County, MN, Wabasha County, MN, Waseca County, MN, Washington County, MN, Watonwan County, MN, Wright County, MN, Yellow Medicine County, MN, Beadle County, SD, Brookings County, SD, Clark County, SD, Codington County, SD, Deuel County, SD, Grant County, SD, Hamlin County, SD, Kingsbury County, SD, Lake County, SD, McCook County, SD, Miner County, SD, Minnehaha County, SD, Moody County, SD, Sanborn County, SD, Pierce County, WI, Saint Croix County, WI

The radar

The Minneapolis radar (KMPX), 140 km from the middle of the area, began a volume at 21:06 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

Omaha, NE (KOAX), launched 12:00Z, 9.1 hours before the alert went out and 386 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: 39 J/kg
Mixed-layer CIN: -719 J/kg
Mixed-layer LCL: 1713 m above ground
0-6 km bulk shear: 22 kt
0-1 km storm-relative helicity: 78 m²/s²
0-3 km storm-relative helicity: 21 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
Apr 15, 5:15 PM CDT	Severe Thunderstorm Watch	SPC	Cottonwood, Lincoln, Lyon, Murray, Nobles, Pipestone and 2 more	6 hr
Apr 15, 5:35 PM CDT	Severe Thunderstorm Watch	SPC	Anoka, Blue Earth, Brown, Carver, Chisago, Dakota and 28 more	6 hr
Apr 15, 4:46 PM CDT	Mesoscale Discussion	SPC	Bon Homme, Charles Mix, Clay, Douglas, Gregory, Hutchinson and 4 more	89 min
Apr 14, 9:47 PM CDT	Mesoscale Discussion	SPC	Florence, Forest, Iron, Oneida, Vilas	3 hr
Apr 15, 2:53 PM CDT	Mesoscale Discussion	SPC	Brown, Calumet, Clark, Jackson, Kewaunee, Langlade and 13 more	3 hr

Nearby

Mesoscale Discussions in Minnesota, 2003 Mesoscale Discussions in South Dakota, 2003 Mesoscale Discussions in Wisconsin, 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.