Alert archive / Louisiana / Mesoscale Discussions in 2013

Mesoscale Discussion 219

February 25, 20134 states

The Storm Prediction Center issued this mesoscale discussion at Feb 25, 2013, 9:25 AM CST for 4 states. It was in force for 65 min.

The area

The outline as issued.

The facts

Issued: Feb 25, 2013, 9:25 AM CST (15:25 UTC)
Expired: Feb 25, 2013, 10:30 AM CST
In force: 65 min
Issued by: the Storm Prediction Center
Chance of a watch: 80%

All 102 counties

Ashley County, AR, Bradley County, AR, Calhoun County, AR, Clark County, AR, Columbia County, AR, Dallas County, AR, Hempstead County, AR, Howard County, AR, Lafayette County, AR, Miller County, AR, Nevada County, AR, Ouachita County, AR, Union County, AR, Acadia Parish, LA, Allen Parish, LA, Ascension Parish, LA, Assumption 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, East Baton Rouge Parish, LA, East Carroll Parish, LA, East Feliciana Parish, LA, Evangeline Parish, LA, Franklin Parish, LA, Grant Parish, LA, Iberia Parish, LA, Iberville Parish, LA, Jackson Parish, LA, Jefferson Davis Parish, LA, Jefferson Parish, LA, Lafayette Parish, LA, Lafourche Parish, LA, LaSalle Parish, LA, Lincoln Parish, LA, Livingston Parish, LA, Madison Parish, LA, Morehouse Parish, LA, Natchitoches Parish, LA, Orleans Parish, LA, Ouachita Parish, LA, Pointe Coupee Parish, LA, Rapides Parish, LA, Red River Parish, LA, Richland Parish, LA, Sabine Parish, LA, Saint Charles Parish, LA, Saint Helena Parish, LA, Saint James Parish, LA, Saint John the Baptist Parish, LA, Saint Landry Parish, LA, Saint Martin Parish, LA, Saint Tammany Parish, LA, St. Mary Parish, LA, Tangipahoa Parish, LA, Tensas Parish, LA, Terrebonne Parish, LA, Union Parish, LA, Vermilion Parish, LA, Vernon Parish, LA, Washington Parish, LA, Webster Parish, LA, West Baton Rouge Parish, LA, West Carroll Parish, LA, West Feliciana Parish, LA, Winn Parish, LA, Adams County, MS, Amite County, MS, Claiborne County, MS, Copiah County, MS, Franklin County, MS, Hinds County, MS, Issaquena County, MS, Jefferson County, MS, Jefferson Davis County, MS, Lawrence County, MS, Lincoln County, MS, Marion County, MS, Pike County, MS, Walthall County, MS, Warren County, MS, Wilkinson County, MS, Hardin County, TX, Harrison County, TX, Jasper County, TX, Jefferson County, TX, Newton County, TX, Orange County, TX, Panola County, TX, Sabine County, TX, San Augustine County, TX, Shelby County, TX, Tyler 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, 3.4 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: 1164 J/kg
Mixed-layer CIN: -46 J/kg
Mixed-layer LCL: 440 m above ground
0-6 km bulk shear: 52 kt
0-1 km storm-relative helicity: 202 m²/s²
0-3 km storm-relative helicity: 252 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 4.4

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.

Issued	Product	Office	Counties	Lasted
Feb 25, 12:26 PM CST	Tornado Watch	SPC	Ashley, Chicot, Columbia, Lafayette, Miller, Union	10 hr
Feb 25, 12:56 PM CST	Severe Thunderstorm Watch	SPC	Arkansas, Bradley, Calhoun, Clark, Cleburne, Cleveland and 31 more	5 hr
Feb 25, 2:15 PM CST	Mesoscale Discussion	SPC	Ashley, Union	90 min
Feb 25, 3:37 PM CST	Mesoscale Discussion	SPC	Arkansas, Bradley, Calhoun, Cleburne, Cleveland, Conway and 15 more	83 min
Feb 24, 6:48 PM CST	Mesoscale Discussion	SPC	Ascension, Assumption, Iberia, Iberville, Jefferson, Lafourche and 10 more	87 min
Feb 24, 11:57 PM CST	Mesoscale Discussion	SPC	Ascension, Assumption, Iberia, Jefferson, Lafourche, Livingston and 9 more	63 min
Feb 25, 12:04 AM CST	Severe Thunderstorm Watch	SPC	Ascension, Assumption, East Baton Rouge, East Feliciana, Iberville, Jefferson and 14 more	8 hr
Feb 25, 2:50 AM CST	Mesoscale Discussion	SPC	Jefferson, Lafourche, Orleans, Plaquemines, Saint Bernard, Saint Charles and 3 more	115 min
Feb 25, 9:07 AM CST	Mesoscale Discussion	SPC	Plaquemines, Saint Bernard	2 hr
Feb 25, 2:52 PM CST	Mesoscale Discussion	SPC	Saint Bernard	83 min
Feb 25, 3:54 PM CST	Tornado Watch	SPC	Attala, Bolivar, Carroll, Choctaw, Clarke, Clay and 32 more	6 hr
Feb 24, 7:20 PM CST	Mesoscale Discussion	SPC	Armstrong, Carson, Dallam, Deaf Smith, Gray, Hansford and 11 more	6 hr
Feb 24, 7:52 PM CST	Mesoscale Discussion	SPC	Baylor, Childress, Collingsworth, Cottle, Foard, Hall and 4 more	113 min
Feb 24, 10:25 PM CST	Mesoscale Discussion	SPC	Archer, Baylor, Brown, Callahan, Coke, Coleman and 29 more	2 hr
Feb 24, 10:36 PM CST	Severe Thunderstorm Watch	SPC	Archer, Baylor, Brown, Callahan, Clay, Coke and 27 more	5 hr
Feb 25, 2:01 AM CST	Mesoscale Discussion	SPC	Archer, Baylor, Brown, Callahan, Clay, Coleman and 19 more	119 min
Feb 25, 3:39 AM CST	Mesoscale Discussion	SPC	Armstrong, Briscoe, Carson, Castro, Collingsworth, Deaf Smith and 19 more	5 hr
Feb 25, 10:54 AM CST	Mesoscale Discussion	SPC	Armstrong, Briscoe, Carson, Castro, Childress, Collingsworth and 23 more	6 hr

Nearby

Mesoscale Discussions in Louisiana, 2013 Mesoscale Discussions in Mississippi, 2013 Mesoscale Discussions in Arkansas, 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.