Alert archive / Texas / Mesoscale Discussions in 2013

Mesoscale Discussion 378

April 2, 201317 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at Apr 2, 2013, 10:26 PM CDT for 17 counties in Texas. It was in force for 64 min.

The area

The outline as issued.

The facts

Issued: Apr 2, 2013, 10:26 PM CDT (03:26 UTC)
Expired: Apr 2, 2013, 11:30 PM CDT
In force: 64 min
Issued by: the Storm Prediction Center

Counties Atascosa County, TX, Bexar County, TX, Blanco County, TX, Comal County, TX, Dimmit County, TX, Duval County, TX, Frio County, TX, Guadalupe County, TX, Hays County, TX, Kendall County, TX, La Salle County, TX, Live Oak County, TX, McMullen County, TX, Medina County, TX, Webb County, TX, Wilson County, TX, Zavala County, TX

The watches that followed

Watches SPC issued over any of the same counties within four hours of this discussion.

Severe Thunderstorm Watch 81Apr 2, 10:45 PM CDT

The nearest sounding before it

Del Rio, TX (KDRT), launched 00:00Z, 3.4 hours before the alert went out and 180 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: 1788 J/kg
Mixed-layer CIN: 0 J/kg
Mixed-layer LCL: 573 m above ground
0-6 km bulk shear: 40 kt
0-1 km storm-relative helicity: 128 m²/s²
0-3 km storm-relative helicity: 154 m²/s²
Significant tornado parameter: 1.1
Supercell composite: 5.7

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
Apr 2, 7:35 PM CDT	Mesoscale Discussion	SPC	Atascosa, Bandera, Bastrop, Bell, Bexar, Blanco and 43 more	85 min
Apr 2, 8:15 PM CDT	Mesoscale Discussion	SPC	Austin, Brazoria, Brazos, Burleson, Chambers, Colorado and 13 more	60 min
Apr 2, 10:06 PM CDT	Mesoscale Discussion	SPC	Brazoria, Chambers, Fort Bend, Galveston, Harris	54 min
Apr 2, 10:47 PM CDT	Severe Thunderstorm Watch	SPC	Atascosa, Bee, Dimmit, Duval, Frio, Jim Wells and 4 more	5 hr
Apr 3, 1:10 AM CDT	Mesoscale Discussion	SPC	Jasper, Newton, Orange	3 hr
Apr 3, 1:36 AM CDT	Mesoscale Discussion	SPC	Aransas, Austin, Bee, Brazoria, Calhoun, Chambers and 13 more	114 min
Apr 3, 7:59 AM CDT	Mesoscale Discussion	SPC	Atascosa, Bandera, Bexar, Blanco, Comal, Dimmit and 20 more	91 min

Nearby

Mesoscale Discussions in Texas, 2013 Every mesoscale discussion in 2013

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.