Alert archive / Louisiana / Mesoscale Discussions in 2014

Mesoscale Discussion 1880

October 13, 201410 parishes in Louisiana; 5 counties in Mississippi

The Storm Prediction Center issued this mesoscale discussion at Oct 13, 2014, 5:45 PM CDT for 10 parishes in Louisiana; 5 counties in Mississippi. It was in force for 90 min.

The area

The outline as issued.

The facts

Issued: Oct 13, 2014, 5:45 PM CDT (22:45 UTC)
Expired: Oct 13, 2014, 7:15 PM CDT
In force: 90 min
Issued by: the Storm Prediction Center

Counties Jefferson Parish, LA, Lafourche Parish, LA, Orleans Parish, LA, Saint Charles Parish, LA, Saint James Parish, LA, Saint John the Baptist Parish, LA, Saint Tammany Parish, LA, Tangipahoa Parish, LA, Terrebonne Parish, LA, Washington Parish, LA, George County, MS, Hancock County, MS, Harrison County, MS, Pearl River County, MS, Stone County, MS

The nearest sounding before it

Slidell Radar S, LA (KSIL), launched 12:00Z, 10.8 hours before the alert went out and 8 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: 2055 J/kg
Mixed-layer CIN: 0 J/kg
Mixed-layer LCL: 562 m above ground
0-6 km bulk shear: 31 kt
0-1 km storm-relative helicity: 156 m²/s²
0-3 km storm-relative helicity: 204 m²/s²
Significant tornado parameter: 1.3
Supercell composite: 7.3

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.

Issued	Product	Office	Counties	Lasted
Oct 12, 8:04 PM CDT	Mesoscale Discussion	SPC	East Carroll, Morehouse, West Carroll	86 min
Oct 13, 2:43 AM CDT	Mesoscale Discussion	SPC	Bossier, Caddo, De Soto, Webster	92 min
Oct 13, 3:22 AM CDT	Tornado Watch	SPC	Bossier, Caddo, De Soto, Webster	8 hr
Oct 13, 6:34 AM CDT	Mesoscale Discussion	SPC	Bienville, Bossier, Caddo, Caldwell, Catahoula, Claiborne and 21 more	86 min
Oct 13, 7:08 AM CDT	Tornado Watch	SPC	Bienville, Caldwell, Catahoula, Claiborne, Concordia, East Carroll and 16 more	7 hr
Oct 13, 10:20 AM CDT	Mesoscale Discussion	SPC	Bienville, Caldwell, Catahoula, Concordia, East Carroll, Franklin and 14 more	115 min
Oct 13, 11:10 AM CDT	Tornado Watch	SPC	Acadia, Allen, Avoyelles, Beauregard, Calcasieu, Cameron and 10 more	8 hr
Oct 13, 11:52 AM CDT	Mesoscale Discussion	SPC	East Carroll, Franklin, Madison, Richland, Tensas, West Carroll	113 min
Oct 13, 12:57 PM CDT	Tornado Watch	SPC	Catahoula, Concordia, East Carroll, Franklin, Madison, Tensas	7 hr
Oct 13, 1:39 PM CDT	Tornado Watch	SPC	Ascension, Assumption, East Baton Rouge, East Feliciana, Iberville, Jefferson and 16 more	8 hr
Oct 12, 11:46 PM CDT	Mesoscale Discussion	SPC	Calhoun, Carroll, Chickasaw, Clay, Grenada, Itawamba and 10 more	89 min
Oct 13, 2:22 PM CDT	Mesoscale Discussion	SPC	Alcorn, Attala, Benton, Calhoun, Carroll, Chickasaw and 32 more	113 min
Oct 13, 5:27 PM CDT	Mesoscale Discussion	SPC	Itawamba, Monroe, Tishomingo	63 min

Nearby

Mesoscale Discussions in Louisiana, 2014 Mesoscale Discussions in Mississippi, 2014 Every mesoscale discussion in 2014

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.