Alert archive / Texas / Mesoscale Discussions in 2005

Mesoscale Discussion 2218

September 17, 200511 counties in Oklahoma; 17 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at Sep 17, 2005, 6:38 PM CDT for 11 counties in Oklahoma; 17 counties in Texas. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued: Sep 17, 2005, 6:38 PM CDT (23:38 UTC)
Expired: Sep 17, 2005, 8:45 PM CDT
In force: 2 hr
Issued by: the Storm Prediction Center

All 28 counties

Beckham County, OK, Custer County, OK, Dewey County, OK, Ellis County, OK, Greer County, OK, Harmon County, OK, Harper County, OK, Jackson County, OK, Roger Mills County, OK, Washita County, OK, Woodward County, OK, Briscoe County, TX, Childress County, TX, Collingsworth County, TX, Cottle County, TX, Crosby County, TX, Dickens County, TX, Donley County, TX, Floyd County, TX, Gray County, TX, Hale County, TX, Hall County, TX, Hardeman County, TX, Hemphill County, TX, Lipscomb County, TX, Lubbock County, TX, Motley County, TX, Wheeler County, TX

The radar

The Amarillo radar (KAMA), 112 km from the middle of the area, began a volume at 23:38 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

Amarillo Airport, TX (KAMA), launched 12:00Z, 11.6 hours before the alert went out and 111 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: 895 J/kg
Mixed-layer CIN: -296 J/kg
Mixed-layer LCL: 926 m above ground
0-6 km bulk shear: 35 kt
0-1 km storm-relative helicity: 298 m²/s²
0-3 km storm-relative helicity: 313 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 1.1

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
Sep 17, 5:17 PM CDT	Mesoscale Discussion	SPC	Alfalfa, Beaver, Beckham, Blaine, Custer, Dewey and 10 more	58 min
Sep 17, 5:45 PM CDT	Severe Thunderstorm Watch	SPC	Beckham, Ellis, Harper, Roger Mills, Woods, Woodward	3 hr
Sep 17, 3:41 PM CDT	Mesoscale Discussion	SPC	Andrews, Armstrong, Bailey, Briscoe, Castro, Cochran and 15 more	2 hr
Sep 17, 3:50 PM CDT	Severe Thunderstorm Watch	SPC	Andrews, Bailey, Borden, Briscoe, Castro, Cochran and 16 more	6 hr

Nearby

Mesoscale Discussions in Texas, 2005 Mesoscale Discussions in Oklahoma, 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.