Alert archive / Texas / Mesoscale Discussions in 2015

Mesoscale Discussion 603

May 11, 20156 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at May 11, 2015, 2:31 AM CDT for 6 counties in Texas. It was in force for 89 min.

The area

The outline as issued.

The facts

Issued: May 11, 2015, 2:31 AM CDT (07:31 UTC)
Expired: May 11, 2015, 4:00 AM CDT
In force: 89 min
Issued by: the Storm Prediction Center
Chance of a watch: 40%

Counties Edwards County, TX, Kerr County, TX, Kimble County, TX, Real County, TX, Sutton County, TX, Val Verde County, TX

The radar

The Laughlin AFB radar (KDFX), 98 km from the middle of the area, began a volume at 07:34 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 163May 11, 4:20 AM CDT

The nearest sounding before it

Del Rio, TX (KDLF), launched 00:00Z, 7.5 hours before the alert went out and 89 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: 1932 J/kg
Mixed-layer CIN: -33 J/kg
Mixed-layer LCL: 1379 m above ground
0-6 km bulk shear: 44 kt
0-1 km storm-relative helicity: -18 m²/s²
0-3 km storm-relative helicity: 50 m²/s²
Significant tornado parameter: 0.1
Supercell composite: 0.6

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, 7:08 PM CDT	Mesoscale Discussion	SPC	Bowie, Camp, Cass, Cherokee, Franklin, Gregg and 9 more	97 min
May 10, 7:34 PM CDT	Tornado Watch	SPC	Bowie, Camp, Cass, Cherokee, Franklin, Gregg and 9 more	4 hr
May 10, 8:06 PM CDT	Mesoscale Discussion	SPC	Anderson, Fannin, Freestone, Henderson, Hunt, Kaufman and 5 more	54 min
May 10, 9:57 PM CDT	Mesoscale Discussion	SPC	Anderson, Bowie, Camp, Cass, Cherokee, Franklin and 12 more	93 min
May 10, 11:31 PM CDT	Tornado Watch	SPC	Bowie, Camp, Cass, Cherokee, Gregg, Harrison and 7 more	5 hr
May 11, 2:55 AM CDT	Mesoscale Discussion	SPC	Angelina, Brazos, Burleson, Houston, Leon, Madison and 7 more	95 min
May 11, 4:19 AM CDT	Severe Thunderstorm Watch	SPC	Bandera, Bastrop, Bexar, Blanco, Burnet, Caldwell and 18 more	7 hr
May 11, 7:04 AM CDT	Mesoscale Discussion	SPC	Austin, Bandera, Bastrop, Bexar, Blanco, Burleson and 34 more	56 min
May 11, 2:16 PM CDT	Mesoscale Discussion	SPC	Atascosa, Bee, Bexar, Colorado, DeWitt, Dimmit and 18 more	119 min

Nearby

Mesoscale Discussions in Texas, 2015 Every mesoscale discussion in 2015

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.