Alert archive / Louisiana / Mesoscale Discussions in 2013

Mesoscale Discussion 344

March 30, 201324 parishes in Louisiana; 9 counties in Mississippi; 13 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at Mar 30, 2013, 5:37 PM CDT for 24 parishes in Louisiana; 9 counties in Mississippi; 13 counties in Texas. It was in force for 53 min.

The area

The outline as issued.

The facts

Issued: Mar 30, 2013, 5:37 PM CDT (22:37 UTC)
Expired: Mar 30, 2013, 6:30 PM CDT
In force: 53 min
Issued by: the Storm Prediction Center

All 46 counties

Avoyelles Parish, LA, Bienville Parish, LA, Bossier Parish, LA, Caddo Parish, LA, Caldwell Parish, LA, Catahoula Parish, LA, Concordia Parish, LA, De Soto Parish, LA, Franklin Parish, LA, Grant Parish, LA, Jackson Parish, LA, LaSalle Parish, LA, Lincoln Parish, LA, Madison Parish, LA, Natchitoches Parish, LA, Ouachita Parish, LA, Rapides Parish, LA, Red River Parish, LA, Richland Parish, LA, Sabine Parish, LA, Tensas Parish, LA, Vernon Parish, LA, Webster Parish, LA, Winn Parish, LA, Adams County, MS, Amite County, MS, Claiborne County, MS, Copiah County, MS, Franklin County, MS, Jefferson County, MS, Lawrence County, MS, Lincoln County, MS, Wilkinson County, MS, Bowie County, TX, Camp County, TX, Cass County, TX, Gregg County, TX, Harrison County, TX, Marion County, TX, Morris County, TX, Panola County, TX, Red River County, TX, Rusk County, TX, Sabine County, TX, Shelby County, TX, Titus County, TX

The radar

The Shreveport radar (KSHV), 103 km from the middle of the area, began a volume at 22:39 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

Shreveport, LA (KSHV), launched 12:00Z, 10.6 hours before the alert went out and 96 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: 137 J/kg
Mixed-layer CIN: -14 J/kg
Mixed-layer LCL: 497 m above ground
0-6 km bulk shear: 31 kt
0-1 km storm-relative helicity: 109 m²/s²
0-3 km storm-relative helicity: 25 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

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
Mar 30, 2:21 PM CDT	Mesoscale Discussion	SPC	Bienville, Bossier, Caddo, Caldwell, Catahoula, De Soto and 8 more	84 min
Mar 30, 2:33 PM CDT	Severe Thunderstorm Watch	SPC	Avoyelles, Bienville, Bossier, Caddo, Caldwell, Catahoula and 18 more	3 hr
Mar 29, 7:01 PM CDT	Mesoscale Discussion	SPC	Baylor, Borden, Briscoe, Callahan, Childress, Coke and 41 more	89 min
Mar 29, 9:24 PM CDT	Mesoscale Discussion	SPC	Archer, Baylor, Clay, Collin, Cooke, Delta and 16 more	96 min
Mar 29, 10:30 PM CDT	Severe Thunderstorm Watch	SPC	Archer, Clay, Collin, Cooke, Denton, Fannin and 6 more	5 hr
Mar 30, 1:21 AM CDT	Mesoscale Discussion	SPC	Collin, Dallas, Denton, Ellis, Fannin, Grayson and 8 more	114 min
Mar 30, 10:24 AM CDT	Mesoscale Discussion	SPC	Bowie, Delta, Franklin, Lamar, Morris, Red River and 1 more	96 min
Mar 30, 4:53 PM CDT	Mesoscale Discussion	SPC	Childress, Collingsworth, Cottle, Foard, Hall, Hardeman	97 min
Mar 30, 5:15 PM CDT	Mesoscale Discussion	SPC	Brown, Callahan, Coleman, Comanche, Concho, Eastland and 8 more	90 min
Mar 30, 6:06 PM CDT	Severe Thunderstorm Watch	SPC	Clay, Collin, Cooke, Denton, Fannin, Grayson and 5 more	7 hr

Nearby

Mesoscale Discussions in Louisiana, 2013 Mesoscale Discussions in Texas, 2013 Mesoscale Discussions in Mississippi, 2013 Every mesoscale discussion in 2013

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.