Alert archive / South Dakota / Mesoscale Discussions in 2004

Mesoscale Discussion 1657

July 13, 20046 counties in Nebraska; 10 counties in South Dakota; Niobrara County, Weston County, Wyoming

The Storm Prediction Center issued this mesoscale discussion at Jul 13, 2004, 8:51 PM MDT for 6 counties in Nebraska; 10 counties in South Dakota; Niobrara County, Weston County, Wyoming. It was in force for 84 min.

The area

The outline as issued.

The facts

Issued: Jul 13, 2004, 8:51 PM MDT (02:51 UTC)
Expired: Jul 13, 2004, 10:15 PM MDT
In force: 84 min
Issued by: the Storm Prediction Center

Counties Box Butte County, NE, Cherry County, NE, Dawes County, NE, Hooker County, NE, Sheridan County, NE, Sioux County, NE, Bennett County, SD, Custer County, SD, Fall River County, SD, Haakon County, SD, Jackson County, SD, Lawrence County, SD, Meade County, SD, Oglala Lakota County, SD, Pennington County, SD, Todd County, SD, Niobrara County, WY, Weston County, WY

The radar

The Rapid City radar (KUDX), 94 km from the middle of the area, began a volume at 02:55 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

Rapid City, SD (KUNR), launched 00:00Z, 2.9 hours before the alert went out and 87 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: 145 J/kg
Mixed-layer CIN: -391 J/kg
Mixed-layer LCL: 2292 m above ground
0-6 km bulk shear: 44 kt
0-1 km storm-relative helicity: 93 m²/s²
0-3 km storm-relative helicity: 94 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.1

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 13, 6:15 PM MDT	Mesoscale Discussion	SPC	Arthur, Banner, Box Butte, Cheyenne, Dawes, Deuel and 9 more	90 min
Jul 13, 10:52 PM MDT	Mesoscale Discussion	SPC	Blaine, Boyd, Brown, Cherry, Garfield, Grant and 10 more	83 min
Jul 14, 3:53 PM MDT	Mesoscale Discussion	SPC	Arthur, Banner, Box Butte, Cherry, Cheyenne, Dawes and 8 more	2 hr
Jul 14, 4:35 PM MDT	Severe Thunderstorm Watch	SPC	Banner, Box Butte, Cheyenne, Dawes, Deuel, Kimball and 3 more	5 hr

Nearby

Mesoscale Discussions in South Dakota, 2004 Mesoscale Discussions in Nebraska, 2004 Mesoscale Discussions in Wyoming, 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.