Alert archive / Louisiana / Mesoscale Discussions in 2012

Mesoscale Discussion 1136

June 12, 20124 states

The Storm Prediction Center issued this mesoscale discussion at Jun 12, 2012, 6:08 AM CDT for 4 states. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued: Jun 12, 2012, 6:08 AM CDT (11:08 UTC)
Expired: Jun 12, 2012, 8:15 AM CDT
In force: 2 hr
Issued by: the Storm Prediction Center
Chance of a watch: 40%

All 28 counties

Ashley County, AR, Chicot County, AR, Bienville Parish, LA, Caldwell Parish, LA, Catahoula Parish, LA, Concordia Parish, LA, De Soto Parish, LA, East Carroll Parish, LA, Franklin Parish, LA, Grant Parish, LA, Jackson Parish, LA, LaSalle Parish, LA, Lincoln Parish, LA, Madison Parish, LA, Morehouse Parish, LA, Natchitoches Parish, LA, Ouachita Parish, LA, Red River Parish, LA, Richland Parish, LA, Sabine Parish, LA, Tensas Parish, LA, Union Parish, LA, West Carroll Parish, LA, Winn Parish, LA, Adams County, MS, Nacogdoches County, TX, Panola County, TX, Shelby County, TX

The radar

The Shreveport radar (KSHV), 102 km from the middle of the area, began a volume at 11:09 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 00:00Z, 11.1 hours before the alert went out and 94 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: 2755 J/kg
Mixed-layer CIN: -66 J/kg
Mixed-layer LCL: 1712 m above ground
0-6 km bulk shear: 28 kt
0-1 km storm-relative helicity: -42 m²/s²
0-3 km storm-relative helicity: 76 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
Jun 11, 7:33 PM CDT	Mesoscale Discussion	SPC	Ashley, Chicot, Drew	57 min
Jun 11, 9:25 PM CDT	Severe Thunderstorm Watch	SPC	Sebastian	7 hr
Jun 11, 11:52 PM CDT	Severe Thunderstorm Watch	SPC	Bradley, Calhoun, Clark, Cleveland, Columbia, Dallas and 15 more	6 hr
Jun 12, 2:54 AM CDT	Mesoscale Discussion	SPC	Calhoun, Clark, Columbia, Dallas, Hempstead, Howard and 8 more	96 min
Jun 12, 3:21 AM CDT	Severe Thunderstorm Watch	SPC	Ashley, Chicot, Columbia, Hempstead, Lafayette, Little River and 3 more	8 hr
Jun 11, 8:37 PM CDT	Severe Thunderstorm Watch	SPC	Catahoula, Concordia, East Feliciana, Franklin, Saint Helena, Saint Tammany and 4 more	4 hr
Jun 11, 10:51 PM CDT	Mesoscale Discussion	SPC	East Baton Rouge, East Feliciana, Saint Helena, Tangipahoa, Washington, West Baton Rouge and 1 more	54 min
Jun 12, 7:11 AM CDT	Severe Thunderstorm Watch	SPC	Acadia, Allen, Ascension, Assumption, Avoyelles, Beauregard and 32 more	8 hr
Jun 12, 9:23 AM CDT	Mesoscale Discussion	SPC	Grant, LaSalle, Natchitoches, Sabine	67 min
Jun 12, 12:12 PM CDT	Mesoscale Discussion	SPC	Acadia, Allen, Beauregard, Calcasieu, Cameron, Iberia and 5 more	63 min
Jun 11, 7:11 PM CDT	Mesoscale Discussion	SPC	Brown, Callahan, Clay, Coke, Coleman, Collin and 29 more	94 min
Jun 11, 9:54 PM CDT	Mesoscale Discussion	SPC	Archer, Baylor, Brown, Callahan, Clay, Coke and 31 more	66 min
Jun 11, 11:29 PM CDT	Mesoscale Discussion	SPC	Grayson	61 min
Jun 12, 4:08 AM CDT	Mesoscale Discussion	SPC	Armstrong, Bailey, Briscoe, Castro, Childress, Deaf Smith and 9 more	2 hr
Jun 12, 10:32 AM CDT	Mesoscale Discussion	SPC	Archer, Clay, Collin, Cooke, Dallas, Denton and 19 more	88 min
Jun 12, 11:00 AM CDT	Severe Thunderstorm Watch	SPC	Anderson, Bell, Bosque, Brown, Callahan, Collin and 36 more	6 hr
Jun 12, 2:02 PM CDT	Mesoscale Discussion	SPC	Dallam, Deaf Smith, Hartley, Oldham	88 min
Jun 12, 2:16 PM CDT	Severe Thunderstorm Watch	SPC	Dallam, Deaf Smith, Hartley, Oldham	8 hr
Jun 12, 2:45 PM CDT	Mesoscale Discussion	SPC	Coke, Coleman, Concho, Glasscock, Midland, Mitchell and 4 more	60 min
Jun 12, 3:00 PM CDT	Mesoscale Discussion	SPC	Andrews, Bailey, Cochran, Crane, Ector, Gaines and 7 more	60 min
Jun 12, 3:28 PM CDT	Mesoscale Discussion	SPC	Anderson, Bell, Bosque, Brazos, Brown, Burleson and 37 more	62 min
Jun 12, 3:44 PM CDT	Severe Thunderstorm Watch	SPC	Andrews, Bailey, Cochran, Crane, Culberson, Ector and 13 more	8 hr
Jun 12, 3:56 PM CDT	Severe Thunderstorm Watch	SPC	Anderson, Austin, Bell, Brazoria, Brazos, Burleson and 24 more	4 hr
Jun 12, 5:42 PM CDT	Mesoscale Discussion	SPC	Dallam	63 min

Nearby

Mesoscale Discussions in Louisiana, 2012 Mesoscale Discussions in Texas, 2012 Mesoscale Discussions in Arkansas, 2012 Every mesoscale discussion in 2012

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.