Alert archive / Texas / Mesoscale Discussions in 2004

Mesoscale Discussion 648

May 11, 20048 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at May 11, 2004, 10:05 AM CDT for 8 counties in Texas. It was in force for 115 min.

The area

The outline as issued.

The facts

Issued: May 11, 2004, 10:05 AM CDT (15:05 UTC)
Expired: May 11, 2004, 12:00 PM CDT
In force: 115 min
Issued by: the Storm Prediction Center

Counties Bee County, TX, Duval County, TX, Goliad County, TX, Jim Wells County, TX, Live Oak County, TX, McMullen County, TX, Refugio County, TX, San Patricio County, TX

The radar

The Corpus Christi radar (KCRP), 94 km from the middle of the area, began a volume at 15:09 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 183May 11, 10:55 AM CDT

The nearest sounding before it

Corpus Christi, TX (KCRP), launched 12:00Z, 3.1 hours before the alert went out and 112 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: 2170 J/kg
Mixed-layer CIN: -1 J/kg
Mixed-layer LCL: 548 m above ground
0-6 km bulk shear: 38 kt
0-1 km storm-relative helicity: 89 m²/s²
0-3 km storm-relative helicity: 152 m²/s²
Significant tornado parameter: 1.1
Supercell composite: 6.7

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
May 10, 7:43 PM CDT	Mesoscale Discussion	SPC	Armstrong, Bailey, Borden, Briscoe, Carson, Castro and 38 more	2 hr
May 11, 9:37 AM CDT	Mesoscale Discussion	SPC	Aransas, Austin, Bee, Brazoria, Chambers, Colorado and 17 more	113 min
May 11, 10:55 AM CDT	Severe Thunderstorm Watch	SPC	Aransas, Atascosa, Austin, Bastrop, Bee, Brazoria and 33 more	5 hr
May 11, 2:00 PM CDT	Mesoscale Discussion	SPC	Dallam, Hansford, Hartley, Hutchinson, Moore, Oldham and 1 more	2 hr
May 11, 2:33 PM CDT	Mesoscale Discussion	SPC	Crane, Crockett, Glasscock, Irion, Midland, Pecos and 3 more	117 min
May 11, 2:58 PM CDT	Mesoscale Discussion	SPC	Brazoria, Fort Bend, Harris, Matagorda	62 min
May 11, 3:00 PM CDT	Mesoscale Discussion	SPC	Brazoria, Fort Bend, Harris, Matagorda	60 min
May 11, 3:50 PM CDT	Severe Thunderstorm Watch	SPC	Chambers, Hardin, Harris, Jefferson, Liberty, Orange	3 hr
May 11, 4:05 PM CDT	Severe Thunderstorm Watch	SPC	Armstrong, Bailey, Briscoe, Carson, Castro, Childress and 38 more	6 hr
May 11, 6:03 PM CDT	Mesoscale Discussion	SPC	Chambers, Hardin, Jefferson, Liberty, Orange	57 min

Nearby

Mesoscale Discussions in Texas, 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.