Alert archive / Texas / Mesoscale Discussions in 2003

Mesoscale Discussion 2456

October 25, 200320 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at Oct 25, 2003, 5:21 PM CDT for 20 counties in Texas. It was in force for 84 min.

The area

The outline as issued.

The facts

Issued: Oct 25, 2003, 5:21 PM CDT (22:21 UTC)
Expired: Oct 25, 2003, 6:45 PM CDT
In force: 84 min
Issued by: the Storm Prediction Center

Counties Atascosa County, TX, Austin County, TX, Bee County, TX, Burleson County, TX, Colorado County, TX, DeWitt County, TX, Fayette County, TX, Goliad County, TX, Gonzales County, TX, Jackson County, TX, Karnes County, TX, La Salle County, TX, Lavaca County, TX, Live Oak County, TX, McMullen County, TX, Victoria County, TX, Waller County, TX, Washington County, TX, Wharton County, TX, Wilson County, TX

The radar

The Austin/San Antonio radar (KEWX), 96 km from the middle of the area, began a volume at 22:23 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

Corpus Christi, TX (KCRP), launched 12:00Z, 10.4 hours before the alert went out and 142 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: 1994 J/kg
Mixed-layer CIN: -10 J/kg
Mixed-layer LCL: 725 m above ground
0-6 km bulk shear: 28 kt
0-1 km storm-relative helicity: 100 m²/s²
0-3 km storm-relative helicity: 208 m²/s²
Significant tornado parameter: 0.9
Supercell composite: 6.2

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
Oct 25, 7:30 AM CDT	Mesoscale Discussion	SPC	Aransas, Brazoria, Calhoun, Chambers, Fort Bend, Galveston and 3 more	90 min
Oct 25, 9:17 AM CDT	Mesoscale Discussion	SPC	Hardin, Jasper, Jefferson, Liberty, Newton, Orange and 3 more	118 min
Oct 25, 9:45 AM CDT	Severe Thunderstorm Watch	SPC	Chambers, Hardin, Jasper, Jefferson, Newton, Orange and 1 more	5 hr
Oct 25, 12:19 PM CDT	Mesoscale Discussion	SPC	Angelina, Austin, Brazoria, Chambers, Colorado, Fort Bend and 20 more	56 min
Oct 25, 1:20 PM CDT	Mesoscale Discussion	SPC	Aransas, Austin, Bee, Colorado, DeWitt, Fayette and 13 more	85 min

Nearby

Mesoscale Discussions in Texas, 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.