Alert archive / Texas / Mesoscale Discussions in 2004

Mesoscale Discussion 1378

June 22, 20049 counties in Arkansas; 36 parishes in Louisiana; 40 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at Jun 22, 2004, 10:27 AM CDT for 9 counties in Arkansas; 36 parishes in Louisiana; 40 counties in Texas. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued
Jun 22, 2004, 10:27 AM CDT (15:27 UTC)
Expired
Jun 22, 2004, 12:30 PM CDT
In force
2 hr
Issued by
the Storm Prediction Center
All 85 counties

Ashley County, AR, Bradley County, AR, Calhoun County, AR, Columbia County, AR, Lafayette County, AR, Miller County, AR, Nevada County, AR, Ouachita County, AR, Union County, AR, Acadia Parish, LA, Allen Parish, LA, Avoyelles Parish, LA, Beauregard Parish, LA, Bienville Parish, LA, Bossier Parish, LA, Caddo Parish, LA, Calcasieu Parish, LA, Caldwell Parish, LA, Cameron Parish, LA, Catahoula Parish, LA, Claiborne Parish, LA, Concordia Parish, LA, De Soto Parish, LA, Evangeline Parish, LA, Franklin Parish, LA, Grant Parish, LA, Jackson Parish, LA, Jefferson Davis Parish, LA, Lafayette Parish, LA, LaSalle Parish, LA, Lincoln Parish, LA, Morehouse Parish, LA, Natchitoches Parish, LA, Ouachita Parish, LA, Rapides Parish, LA, Red River Parish, LA, Richland Parish, LA, Sabine Parish, LA, Saint Landry Parish, LA, Union Parish, LA, Vermilion Parish, LA, Vernon Parish, LA, Webster Parish, LA, West Carroll Parish, LA, Winn Parish, LA, Anderson County, TX, Angelina County, TX, Brazoria County, TX, Cass County, TX, Chambers County, TX, Cherokee County, TX, Fort Bend County, TX, Freestone County, TX, Galveston County, TX, Gregg County, TX, Grimes County, TX, Hardin County, TX, Harris County, TX, Harrison County, TX, Houston County, TX, Jasper County, TX, Jefferson County, TX, Leon County, TX, Liberty County, TX, Madison County, TX, Marion County, TX, Matagorda County, TX, Montgomery County, TX, Nacogdoches County, TX, Newton County, TX, Orange County, TX, Panola County, TX, Polk County, TX, Rusk County, TX, Sabine County, TX, San Augustine County, TX, San Jacinto County, TX, Shelby County, TX, Smith County, TX, Trinity County, TX, Tyler County, TX, Upshur County, TX, Walker County, TX, Waller County, TX, Wharton 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

Shreveport, LA (KSHV), launched 12:00Z, 3.5 hours before the alert went out and 93 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, Shreveport, LA at 12:00Z on 2004-06-22Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1624 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, Shreveport, LA at 12:00Z on 2004-06-22The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 67 square meters per square second.193958Sfc1 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
1624 J/kg
Mixed-layer CIN
-11 J/kg
Mixed-layer LCL
585 m above ground
0-6 km bulk shear
25 kt
0-1 km storm-relative helicity
67 m²/s²
0-3 km storm-relative helicity
9 m²/s²
Significant tornado parameter
0.0
Supercell composite
1.6

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
Jun 21, 7:52 PM CDTMesoscale DiscussionSPCBenton83 min
Jun 22, 3:10 PM CDTMesoscale DiscussionSPCAshley, Union95 min
Jun 22, 11:55 AM CDTSevere Thunderstorm WatchSPCBeauregard, Calcasieu, De Soto, Natchitoches, Red River, Sabine and 1 more5 hr
Jun 21, 8:05 PM CDTSevere Thunderstorm WatchSPCArmstrong, Baylor, Briscoe, Carson, Castro, Childress and 27 more7 hr
Jun 21, 10:17 PM CDTMesoscale DiscussionSPCArcher, Armstrong, Baylor, Briscoe, Carson, Castro and 28 more88 min
Jun 21, 11:27 PM CDTMesoscale DiscussionSPCClay93 min
Jun 21, 11:44 PM CDTMesoscale DiscussionSPCArmstrong, Baylor, Borden, Briscoe, Callahan, Carson and 56 more91 min
Jun 22, 2:48 AM CDTMesoscale DiscussionSPCArcher, Baylor, Clay, Crosby, Dickens, Foard and 7 more27 min
Jun 22, 4:05 AM CDTMesoscale DiscussionSPCArcher, Clay, Cooke, Montague2 hr

Nearby

Mesoscale Discussions in Texas, 2004Mesoscale Discussions in Louisiana, 2004Mesoscale Discussions in Arkansas, 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.