Alert archive / Texas / Mesoscale Discussions in 2004

Mesoscale Discussion 2434

November 23, 200410 parishes in Louisiana; 31 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at Nov 23, 2004, 11:38 AM CST for 10 parishes in Louisiana; 31 counties in Texas. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued
Nov 23, 2004, 11:38 AM CST (17:38 UTC)
Expired
Nov 23, 2004, 1:45 PM CST
In force
2 hr
Issued by
the Storm Prediction Center
All 41 counties

Allen Parish, LA, Beauregard Parish, LA, Calcasieu Parish, LA, Grant Parish, LA, LaSalle Parish, LA, Natchitoches Parish, LA, Rapides Parish, LA, Sabine Parish, LA, Vernon Parish, LA, Winn Parish, LA, Angelina County, TX, Austin County, TX, Brazoria County, TX, Calhoun County, TX, Chambers County, TX, Colorado County, TX, Fort Bend County, TX, Galveston County, TX, Hardin County, TX, Harris County, TX, Jackson County, TX, Jasper County, TX, Jefferson County, TX, Liberty County, TX, Matagorda County, TX, Montgomery County, TX, Nacogdoches County, TX, Newton County, TX, Orange County, TX, Polk County, TX, Refugio County, TX, Sabine County, TX, San Augustine County, TX, San Jacinto County, TX, Shelby County, TX, Trinity County, TX, Tyler County, TX, Victoria County, TX, Walker County, TX, Waller County, TX, Wharton County, TX

The radar

The Houston radar (KHGX), 32 km from the middle of the area, began a volume at 17:41 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.

The nearest sounding before it

Lake Charles Mun, LA (KLCH), launched 12:00Z, 5.6 hours before the alert went out and 207 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 2004-11-23Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 534 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 2004-11-23The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 168 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
534 J/kg
Mixed-layer CIN
-154 J/kg
Mixed-layer LCL
1172 m above ground
0-6 km bulk shear
42 kt
0-1 km storm-relative helicity
168 m²/s²
0-3 km storm-relative helicity
88 m²/s²
Significant tornado parameter
0.1
Supercell composite
2.3

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
Nov 22, 6:03 PM CSTMesoscale DiscussionSPCAcadia, Allen, Avoyelles, Beauregard, Bienville, Calcasieu and 26 more2 hr
Nov 23, 9:45 AM CSTTornado WatchSPCAllen, Beauregard, Calcasieu, De Soto, Grant, LaSalle and 5 more5 hr
Nov 23, 11:10 AM CSTMesoscale DiscussionSPCAvoyelles, Concordia, Madison, Tensas3 hr
Nov 23, 12:48 PM CSTMesoscale DiscussionSPCBossier, Caddo, De Soto, Grant, Natchitoches, Sabine and 1 more117 min
Nov 23, 2:00 PM CSTTornado WatchSPCAllen, Beauregard, Bienville, Bossier, Caddo, Calcasieu and 19 more7 hr
Nov 23, 3:21 PM CSTMesoscale DiscussionSPCAllen, Beauregard, Bienville, Bossier, Caddo, Calcasieu and 19 more114 min
Nov 23, 5:30 PM CSTMesoscale DiscussionSPCBeauregard, Caldwell, Catahoula, Franklin, Grant, Jackson and 7 more2 hr
Nov 22, 10:30 PM CSTMesoscale DiscussionSPCBorden, Coke, Crockett, Dawson, Fisher, Garza and 21 more2 hr
Nov 22, 11:00 PM CSTTornado WatchSPCAndrews, Borden, Coke, Crane, Crockett, Dawson and 22 more6 hr
Nov 23, 2:58 AM CSTMesoscale DiscussionSPCBorden, Coke, Crockett, Fisher, Glasscock, Howard and 11 more92 min
Nov 23, 4:10 AM CSTSevere Thunderstorm WatchSPCBrown, Callahan, Coke, Coleman, Comanche, Concho and 19 more5 hr
Nov 23, 7:06 AM CSTMesoscale DiscussionSPCAnderson, Angelina, Austin, Bastrop, Bell, Blanco and 46 more84 min
Nov 23, 7:19 AM CSTMesoscale DiscussionSPCBrown, Callahan, Coleman, Comanche, Concho, Denton and 13 more86 min
Nov 23, 7:40 AM CSTMesoscale DiscussionSPCDallam6 hr
Nov 23, 8:45 AM CSTTornado WatchSPCAnderson, Austin, Bastrop, Bell, Blanco, Brazos and 47 more6 hr
Nov 23, 9:15 AM CSTMesoscale DiscussionSPCCollin, Dallas, Delta, Denton, Fannin, Grayson and 5 more3 hr
Nov 23, 10:37 AM CSTMesoscale DiscussionSPCAnderson, Austin, Bastrop, Bell, Blanco, Brazos and 47 more113 min
Nov 23, 12:15 PM CSTMesoscale DiscussionSPCCarson, Dallam, Hansford, Hartley, Hutchinson, Moore and 3 more5 hr
Nov 23, 12:16 PM CSTMesoscale DiscussionSPCBosque, Brown, Coke, Coleman, Concho, Coryell and 22 more2 hr
Nov 23, 2:14 PM CSTMesoscale DiscussionSPCBriscoe, Childress, Cottle, Crosby, Dickens, Fisher and 20 more3 hr
Nov 23, 3:15 PM CSTSevere Thunderstorm WatchSPCAtascosa, Bandera, Bexar, Blanco, Bosque, Brown and 40 more5 hr
Nov 23, 5:30 PM CSTSevere Thunderstorm WatchSPCAtascosa, Bandera, Bastrop, Bell, Bexar, Blanco and 64 more6 hr

Nearby

Mesoscale Discussions in Texas, 2004Mesoscale Discussions in Louisiana, 2004Every mesoscale discussion in 2004

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.