Alert archive / Texas / Mesoscale Discussions in 2011

Mesoscale Discussion 2324

November 15, 20119 parishes in Louisiana; 21 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at Nov 15, 2011, 2:30 PM CST for 9 parishes in Louisiana; 21 counties in Texas. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued: Nov 15, 2011, 2:30 PM CST (20:30 UTC)
Expired: Nov 15, 2011, 4:30 PM CST
In force: 2 hr
Issued by: the Storm Prediction Center

All 30 counties

Allen Parish, LA, Beauregard Parish, LA, Calcasieu Parish, LA, Cameron Parish, LA, De Soto Parish, LA, Natchitoches Parish, LA, Red River Parish, LA, Sabine Parish, LA, Vernon Parish, LA, Angelina County, TX, Chambers County, TX, Galveston County, TX, Hardin County, TX, Houston County, TX, Jasper County, TX, Jefferson County, TX, Liberty County, TX, Montgomery County, TX, Nacogdoches County, TX, Newton County, TX, Orange County, TX, Panola County, TX, Polk County, TX, Sabine County, TX, San Augustine County, TX, San Jacinto County, TX, Shelby County, TX, Trinity County, TX, Tyler County, TX, Walker County, TX

The radar

The Lake Charles radar (KLCH), 100 km from the middle of the area, began a volume at 20:32 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 886Nov 15, 5:55 PM CST

The nearest sounding before it

Lake Charles Mun, LA (KLCH), launched 12:00Z, 8.5 hours before the alert went out and 102 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: 26 J/kg
Mixed-layer CIN: -395 J/kg
Mixed-layer LCL: 948 m above ground
0-6 km bulk shear: 44 kt
0-1 km storm-relative helicity: 180 m²/s²
0-3 km storm-relative helicity: 109 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.7

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
Nov 15, 5:44 PM CST	Mesoscale Discussion	SPC	Acadia, Allen, Avoyelles, Beauregard, Calcasieu, Cameron and 18 more	61 min
Nov 15, 5:56 PM CST	Tornado Watch	SPC	Acadia, Allen, Avoyelles, Beauregard, Calcasieu, Cameron and 23 more	7 hr
Nov 15, 12:02 AM CST	Mesoscale Discussion	SPC	Bandera, Bexar, Dimmit, Edwards, Frio, Kerr and 8 more	2 hr
Nov 15, 2:14 AM CST	Severe Thunderstorm Watch	SPC	Bandera, Dimmit, Edwards, Frio, Gillespie, Kendall and 10 more	7 hr
Nov 15, 5:35 AM CST	Mesoscale Discussion	SPC	Atascosa, Bexar, Blanco, Comal, Duval, Frio and 10 more	85 min
Nov 15, 6:38 AM CST	Severe Thunderstorm Watch	SPC	Atascosa, Bastrop, Bexar, Blanco, Caldwell, Comal and 10 more	6 hr
Nov 15, 8:57 AM CST	Severe Thunderstorm Watch	SPC	Anderson, Angelina, Austin, Brazoria, Brazos, Burleson and 38 more	9 hr
Nov 15, 10:35 AM CST	Mesoscale Discussion	SPC	Atascosa, Bexar, Blanco, Comal, Duval, Frio and 10 more	115 min
Nov 15, 3:49 PM CST	Mesoscale Discussion	SPC	Bowie, Camp, Cass, Delta, Fannin, Franklin and 6 more	116 min

Nearby

Mesoscale Discussions in Texas, 2011 Mesoscale Discussions in Louisiana, 2011 Every mesoscale discussion in 2011

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.