Alert archive / Louisiana / Mesoscale Discussions in 2006

Mesoscale Discussion 692

April 29, 200613 parishes in Louisiana; 5 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at Apr 29, 2006, 9:57 AM CDT for 13 parishes in Louisiana; 5 counties in Texas. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued
Apr 29, 2006, 9:57 AM CDT (14:57 UTC)
Expired
Apr 29, 2006, 12:00 PM CDT
In force
2 hr
Issued by
the Storm Prediction Center

Counties Allen Parish, LA, Beauregard Parish, LA, Bienville Parish, LA, Calcasieu Parish, LA, Grant Parish, LA, Jackson Parish, LA, Lincoln Parish, LA, Natchitoches Parish, LA, Rapides Parish, LA, Red River Parish, LA, Sabine Parish, LA, Vernon Parish, LA, Winn Parish, LA, Chambers County, TX, Hardin County, TX, Jefferson County, TX, Newton County, TX, Orange County, TX

The watches that followed

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

The nearest sounding before it

Lake Charles Mun, LA (KLCH), launched 12:00Z, 3.0 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-pSkew-T log-p diagram, Lake Charles Mun, LA at 12:00Z on 2006-04-29Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 726 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Lake Charles Mun, LA at 12:00Z on 2006-04-29The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 308 square meters per square second.1939587897Sfc1 km3 km6 km9 kmRMLM
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
726 J/kg
Mixed-layer CIN
-55 J/kg
Mixed-layer LCL
547 m above ground
0-6 km bulk shear
55 kt
0-1 km storm-relative helicity
308 m²/s²
0-3 km storm-relative helicity
470 m²/s²
Significant tornado parameter
1.7
Supercell composite
8.4

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.

IssuedProductOfficeCountiesLasted
Apr 29, 6:04 AM CDTTornado WatchSPCAllen, Beauregard, Bienville, Bossier, Caddo, Calcasieu and 18 more7 hr
Apr 29, 7:37 AM CDTMesoscale DiscussionSPCAllen, Beauregard, Bienville, Bossier, Caddo, Calcasieu and 19 more83 min
Apr 29, 11:55 AM CDTMesoscale DiscussionSPCAcadia, Allen, Avoyelles, Beauregard, Bienville, Bossier and 30 more65 min
Apr 29, 12:47 PM CDTTornado WatchSPCAcadia, Allen, Avoyelles, Beauregard, Bienville, Bossier and 27 more8 hr
Apr 29, 5:43 PM CDTTornado WatchSPCAscension, Assumption, East Baton Rouge, East Feliciana, Iberville, Jefferson and 16 more6 hr
Apr 29, 6:26 PM CDTMesoscale DiscussionSPCJackson, Lincoln, Ouachita, Union94 min
Apr 28, 7:43 PM CDTTornado WatchSPCBandera, Bastrop, Bexar, Blanco, Burnet, Caldwell and 33 more6 hr
Apr 28, 8:44 PM CDTMesoscale DiscussionSPCClay, Collin, Cooke, Denton, Fannin, Grayson and 8 more91 min
Apr 28, 10:03 PM CDTMesoscale DiscussionSPCAnderson, Bastrop, Brazos, Burleson, Camp, Cass and 32 more87 min
Apr 28, 11:08 PM CDTTornado WatchSPCAnderson, Angelina, Austin, Bowie, Brazos, Burleson and 40 more7 hr
Apr 28, 11:14 PM CDTMesoscale DiscussionSPCBandera, Bexar, Edwards, Frio, Kendall, Kerr and 5 more91 min
Apr 29, 1:51 AM CDTMesoscale DiscussionSPCAtascosa, Austin, Bastrop, Bell, Bexar, Brazos and 24 more24 min
Apr 29, 1:58 AM CDTTornado WatchSPCAtascosa, Bandera, Bastrop, Bell, Bexar, Blanco and 18 more3 hr
Apr 29, 4:03 AM CDTMesoscale DiscussionSPCAnderson, Angelina, Atascosa, Austin, Bastrop, Bell and 61 more57 min
Apr 29, 10:05 AM CDTMesoscale DiscussionSPCCollin, Cooke, Delta, Fannin, Grayson, Hunt and 2 more115 min

Nearby

Mesoscale Discussions in Louisiana, 2006Mesoscale Discussions in Texas, 2006Every mesoscale discussion in 2006

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.