Alert archive / Texas / Mesoscale Discussions in 2019

Mesoscale Discussion 320

April 13, 201916 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at Apr 13, 2019, 11:11 AM CDT for 16 counties in Texas. It was in force for 34 min.

The area

The outline as issued.

The facts

Issued: Apr 13, 2019, 11:11 AM CDT (16:11 UTC)
Expired: Apr 13, 2019, 11:45 AM CDT
In force: 34 min
Issued by: the Storm Prediction Center
Chance of a watch: 95%

Counties Brazos County, TX, Grimes County, TX, Hardin County, TX, Harris County, TX, Jasper County, TX, Liberty County, TX, Madison County, TX, Montgomery County, TX, Orange County, TX, Polk County, TX, San Jacinto County, TX, Trinity County, TX, Tyler County, TX, Walker County, TX, Waller County, TX, Washington County, TX

The radar

The Houston radar (KHGX), 123 km from the middle of the area, began a volume at 16:11 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.

Tornado Watch 53Apr 13, 11:25 AM CDT

The nearest sounding before it

Lake Charles Mun, LA (KLCH), launched 12:00Z, 4.2 hours before the alert went out and 202 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: 1903 J/kg
Mixed-layer CIN: -34 J/kg
Mixed-layer LCL: 617 m above ground
0-6 km bulk shear: 37 kt
0-1 km storm-relative helicity: 280 m²/s²
0-3 km storm-relative helicity: 468 m²/s²
Significant tornado parameter: 1.8
Supercell composite: 10.7

Open this sounding in Storm Lab

The text

As transmitted.

<!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 12, 10:14 PM CDT	Mesoscale Discussion	SPC	Chambers, Hardin, Harris, Jasper, Liberty, Montgomery and 5 more	3 hr
Apr 12, 11:40 PM CDT	Mesoscale Discussion	SPC	Coke, Crane, Crockett, Ector, Glasscock, Howard and 13 more	2 hr
Apr 13, 12:56 AM CDT	Mesoscale Discussion	SPC	Bandera, Crockett, Edwards, Kerr, Kimble, Kinney and 7 more	2 hr
Apr 13, 1:32 AM CDT	Severe Thunderstorm Watch	SPC	Brown, Callahan, Coke, Coleman, Concho, Crane and 21 more	8 hr
Apr 13, 1:50 AM CDT	Tornado Watch	SPC	Bandera, Crockett, Edwards, Frio, Gillespie, Kendall and 13 more	8 hr
Apr 13, 1:52 AM CDT	Mesoscale Discussion	SPC	Anderson, Angelina, Camp, Cass, Cherokee, Franklin and 25 more	113 min
Apr 13, 4:35 AM CDT	Mesoscale Discussion	SPC	Bosque, Brown, Callahan, Coke, Coleman, Comanche and 26 more	55 min
Apr 13, 4:50 AM CDT	Mesoscale Discussion	SPC	Bandera, Crockett, Edwards, Frio, Gillespie, Kendall and 13 more	55 min
Apr 13, 6:48 AM CDT	Mesoscale Discussion	SPC	Bell, Bosque, Brown, Callahan, Coleman, Comanche and 27 more	57 min
Apr 13, 7:11 AM CDT	Mesoscale Discussion	SPC	Bandera, Bastrop, Bell, Bexar, Blanco, Burleson and 28 more	2 hr
Apr 13, 7:55 AM CDT	Severe Thunderstorm Watch	SPC	Anderson, Bell, Bosque, Comanche, Coryell, Dallas and 27 more	6 hr
Apr 13, 8:38 AM CDT	Severe Thunderstorm Watch	SPC	Atascosa, Bandera, Bastrop, Bexar, Blanco, Burnet and 22 more	5 hr
Apr 13, 9:40 AM CDT	Mesoscale Discussion	SPC	Bastrop, Bell, Bexar, Blanco, Brazos, Burleson and 19 more	95 min
Apr 13, 9:49 AM CDT	Mesoscale Discussion	SPC	Anderson, Angelina, Cherokee, Freestone, Gregg, Harrison and 12 more	56 min
Apr 13, 10:01 AM CDT	Severe Thunderstorm Watch	SPC	Angelina, Austin, Brazos, Burleson, Camp, Cass and 21 more	5 hr
Apr 13, 11:26 AM CDT	Tornado Watch	SPC	Angelina, Brazos, Cherokee, Grimes, Hardin, Harrison and 18 more	8 hr
Apr 13, 11:52 AM CDT	Mesoscale Discussion	SPC	Anderson, Angelina, Brazos, Cherokee, Freestone, Grimes and 12 more	83 min
Apr 13, 1:38 PM CDT	Mesoscale Discussion	SPC	Angelina, Jasper, Nacogdoches, Newton, Sabine, San Augustine and 1 more	97 min
Apr 13, 3:39 PM CDT	Mesoscale Discussion	SPC	Jefferson, Orange	96 min

Nearby

Mesoscale Discussions in Texas, 2019 Every mesoscale discussion in 2019

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.