Alert archive / Texas / Mesoscale Discussions in 2003

Mesoscale Discussion 676

May 1, 200320 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at May 1, 2003, 11:19 PM CDT for 20 counties in Texas. It was in force for 86 min.

The area

The outline as issued.

The facts

Issued: May 1, 2003, 11:19 PM CDT (04:19 UTC)
Expired: May 2, 2003, 12:45 AM CDT
In force: 86 min
Issued by: the Storm Prediction Center

Counties Austin County, TX, Brazoria County, TX, Brazos County, TX, Burleson County, TX, Colorado County, TX, Fort Bend County, TX, Grimes County, TX, Harris County, TX, Houston County, TX, Leon County, TX, Liberty County, TX, Madison County, TX, Montgomery County, TX, Robertson County, TX, San Jacinto County, TX, Trinity County, TX, Walker County, TX, Waller County, TX, Washington County, TX, Wharton County, TX

The radar

The Houston radar (KHGX), 127 km from the middle of the area, began a volume at 04:22 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 206May 1, 11:20 PM CDT

The nearest sounding before it

Lake Charles Mun, LA (KLCH), launched 00:00Z, 4.3 hours before the alert went out and 259 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: 2084 J/kg
Mixed-layer CIN: -167 J/kg
Mixed-layer LCL: 1112 m above ground
0-6 km bulk shear: 25 kt
0-1 km storm-relative helicity: 6 m²/s²
0-3 km storm-relative helicity: 62 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.3

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 1, 7:25 PM CDT	Severe Thunderstorm Watch	SPC	Bell, Blanco, Bosque, Brown, Burnet, Comanche and 29 more	5 hr
May 1, 9:00 PM CDT	Severe Thunderstorm Watch	SPC	Bowie, Cass, Morris, Titus	4 hr
May 1, 10:10 PM CDT	Mesoscale Discussion	SPC	Anderson, Bell, Blanco, Bosque, Brown, Burnet and 30 more	95 min
May 1, 11:20 PM CDT	Severe Thunderstorm Watch	SPC	Austin, Brazoria, Chambers, Fort Bend, Galveston, Harris and 4 more	4 hr
May 1, 11:53 PM CDT	Mesoscale Discussion	SPC	Bowie, Cass, Morris, Titus	67 min
May 2, 2:21 PM CDT	Mesoscale Discussion	SPC	Anderson, Angelina, Cherokee, Gregg, Hardin, Harrison and 15 more	114 min
May 2, 2:25 PM CDT	Mesoscale Discussion	SPC	Bosque, Brown, Callahan, Coke, Coleman, Comanche and 21 more	2 hr
May 2, 2:45 PM CDT	Tornado Watch	SPC	Brown, Callahan, Coke, Coleman, Concho, Crockett and 20 more	6 hr
May 2, 4:28 PM CDT	Mesoscale Discussion	SPC	Anderson, Bell, Bosque, Cherokee, Coryell, Dallas and 30 more	2 hr
May 2, 4:45 PM CDT	Severe Thunderstorm Watch	SPC	Anderson, Bell, Bosque, Brown, Burnet, Cass and 32 more	5 hr
May 2, 5:57 PM CDT	Mesoscale Discussion	SPC	Brown, Callahan, Coke, Coleman, Comanche, Concho and 12 more	2 hr

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.