Alert archive / Minnesota / Mesoscale Discussions in 2004

Mesoscale Discussion 1830

August 2, 200420 counties in Minnesota; Barnes County, Cass County, Richland County, North Dakota

The Storm Prediction Center issued this mesoscale discussion at Aug 2, 2004, 6:41 AM CDT for 20 counties in Minnesota; Barnes County, Cass County, Richland County, North Dakota. It was in force for 64 min.

The area

The outline as issued.

The facts

Issued: Aug 2, 2004, 6:41 AM CDT (11:41 UTC)
Expired: Aug 2, 2004, 7:45 AM CDT
In force: 64 min
Issued by: the Storm Prediction Center

All 23 counties

Anoka County, MN, Becker County, MN, Benton County, MN, Clay County, MN, Douglas County, MN, Grant County, MN, Kandiyohi County, MN, Meeker County, MN, Morrison County, MN, Otter Tail County, MN, Pope County, MN, Sherburne County, MN, Stearns County, MN, Stevens County, MN, Swift County, MN, Todd County, MN, Traverse County, MN, Wadena County, MN, Wilkin County, MN, Wright County, MN, Barnes County, ND, Cass County, ND, Richland County, ND

The radar

The Minneapolis radar (KMPX), 190 km from the middle of the area, began a volume at 11:41 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 nearest sounding before it

Minneapolis, MN (KMPX), launched 00:00Z, 11.7 hours before the alert went out and 188 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: 2637 J/kg
Mixed-layer CIN: -22 J/kg
Mixed-layer LCL: 947 m above ground
0-6 km bulk shear: 32 kt
0-1 km storm-relative helicity: 31 m²/s²
0-3 km storm-relative helicity: 105 m²/s²
Significant tornado parameter: 0.3
Supercell composite: 1.8

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
Aug 1, 7:22 PM CDT	Mesoscale Discussion	SPC	Big Stone, Lac qui Parle, Lincoln, Swift	53 min
Aug 2, 12:20 AM CDT	Severe Thunderstorm Watch	SPC	Murray, Nobles, Pipestone, Rock	4 hr
Aug 2, 12:53 AM CDT	Mesoscale Discussion	SPC	Becker, Beltrami, Cass, Clay, Clearwater, Hubbard and 12 more	97 min
Aug 2, 3:00 AM CDT	Severe Thunderstorm Watch	SPC	Anoka, Becker, Benton, Clay, Douglas, Grant and 14 more	5 hr
Aug 2, 3:02 AM CDT	Mesoscale Discussion	SPC	Murray, Nobles, Rock	58 min
Aug 2, 5:17 AM CDT	Mesoscale Discussion	SPC	Anoka, Becker, Benton, Clay, Douglas, Grant and 14 more	88 min
Aug 2, 3:12 PM CDT	Mesoscale Discussion	SPC	Blue Earth, Brown, Cottonwood, Dodge, Faribault, Freeborn and 18 more	2 hr
Aug 2, 3:50 PM CDT	Severe Thunderstorm Watch	SPC	Blue Earth, Brown, Cottonwood, Faribault, Freeborn, Jackson and 14 more	5 hr
Aug 1, 8:10 PM CDT	Mesoscale Discussion	SPC	Benson, Bottineau, Burleigh, Eddy, Foster, Kidder and 13 more	65 min

Nearby

Mesoscale Discussions in Minnesota, 2004 Mesoscale Discussions in North Dakota, 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.