Alert archive / Texas / Mesoscale Discussions in 2008

Mesoscale Discussion 745

April 26, 200812 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at Apr 26, 2008, 5:46 PM CDT for 12 counties in Texas. It was in force for 59 min.

The area

The outline as issued.

The facts

Issued: Apr 26, 2008, 5:46 PM CDT (22:46 UTC)
Expired: Apr 26, 2008, 6:45 PM CDT
In force: 59 min
Issued by: the Storm Prediction Center

Counties Coke County, TX, Concho County, TX, Crockett County, TX, Glasscock County, TX, Irion County, TX, Menard County, TX, Reagan County, TX, Schleicher County, TX, Sterling County, TX, Terrell County, TX, Tom Green County, TX, Upton County, TX

The radar

The San Angelo radar (KSJT), 73 km from the middle of the area, began a volume at 22:49 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 239Apr 26, 6:05 PM CDT

The nearest sounding before it

Midland Regional, TX (KMAF), launched 12:00Z, 10.8 hours before the alert went out and 148 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 1672 m above ground
0-6 km bulk shear: 36 kt
0-1 km storm-relative helicity: 218 m²/s²
0-3 km storm-relative helicity: 279 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 25, 7:02 PM CDT	Mesoscale Discussion	SPC	Bell, Williamson	88 min
Apr 25, 9:39 PM CDT	Mesoscale Discussion	SPC	Bandera, Bastrop, Blanco, Burnet, Comal, Edwards and 13 more	66 min
Apr 25, 11:49 PM CDT	Mesoscale Discussion	SPC	Atascosa, Austin, Bastrop, Bexar, Burleson, Caldwell and 17 more	56 min
Apr 26, 2:11 AM CDT	Mesoscale Discussion	SPC	Aransas, Atascosa, Bee, Brazoria, Brooks, Calhoun and 25 more	94 min
Apr 26, 3:43 PM CDT	Mesoscale Discussion	SPC	Armstrong, Bailey, Borden, Briscoe, Carson, Castro and 31 more	2 hr
Apr 26, 6:04 PM CDT	Severe Thunderstorm Watch	SPC	Bandera, Baylor, Blanco, Borden, Brown, Callahan and 49 more	7 hr

Nearby

Mesoscale Discussions in Texas, 2008 Every mesoscale discussion in 2008

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.