Alert archive / Texas / Mesoscale Discussions in 2015

Mesoscale Discussion 1897

October 30, 201522 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at Oct 30, 2015, 7:49 AM CDT for 22 counties in Texas. It was in force for 86 min.

The area

The outline as issued.

The facts

Issued: Oct 30, 2015, 7:49 AM CDT (12:49 UTC)
Expired: Oct 30, 2015, 9:15 AM CDT
In force: 86 min
Issued by: the Storm Prediction Center

All 22 counties

Atascosa County, TX, Austin County, TX, Bandera County, TX, Bastrop County, TX, Bexar County, TX, Burleson County, TX, Caldwell County, TX, Colorado County, TX, Comal County, TX, DeWitt County, TX, Fayette County, TX, Gonzales County, TX, Guadalupe County, TX, Hays County, TX, Karnes County, TX, Kendall County, TX, Lavaca County, TX, Lee County, TX, Medina County, TX, Travis County, TX, Washington County, TX, Wilson County, TX

The radar

The Austin/San Antonio radar (KEWX), 45 km from the middle of the area, began a volume at 12:51 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 nearest sounding before it

Corpus Christi, TX (KCRP), launched 12:00Z, 0.8 hours before the alert went out and 198 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: 1894 J/kg
Mixed-layer CIN: -8 J/kg
Mixed-layer LCL: 648 m above ground
0-6 km bulk shear: 27 kt
0-1 km storm-relative helicity: 138 m²/s²
0-3 km storm-relative helicity: 262 m²/s²
Significant tornado parameter: 0.9
Supercell composite: 5.2

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
Oct 29, 11:55 PM CDT	Mesoscale Discussion	SPC	Bandera, Edwards, Gillespie, Kerr, Kimble, Kinney and 10 more	3 hr
Oct 30, 3:48 AM CDT	Mesoscale Discussion	SPC	Atascosa, Bexar, Caldwell, Comal, DeWitt, Frio and 6 more	117 min
Oct 30, 6:07 AM CDT	Tornado Watch	SPC	Atascosa, Austin, Bandera, Bastrop, Bexar, Blanco and 21 more	6 hr
Oct 30, 7:02 AM CDT	Mesoscale Discussion	SPC	Kenedy, Kleberg, Nueces, San Patricio	118 min
Oct 30, 10:32 AM CDT	Mesoscale Discussion	SPC	Atascosa, Austin, Bandera, Bastrop, Bexar, Burleson and 18 more	58 min
Oct 30, 12:02 PM CDT	Tornado Watch	SPC	Austin, Bastrop, Bell, Brazos, Burleson, Caldwell and 16 more	7 hr
Oct 30, 2:14 PM CDT	Mesoscale Discussion	SPC	Austin, Bastrop, Bell, Brazos, Burleson, Caldwell and 13 more	61 min
Oct 30, 4:45 PM CDT	Mesoscale Discussion	SPC	Bandera, Bexar, Blanco, Brown, Burnet, Concho and 25 more	3 hr
Oct 30, 5:40 PM CDT	Mesoscale Discussion	SPC	Bell, Brazos, Burleson, Falls, Freestone, Lee and 7 more	2 hr
Oct 30, 6:21 PM CDT	Severe Thunderstorm Watch	SPC	Bandera, Blanco, Burnet, Dimmit, Edwards, Frio and 11 more	8 hr

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.