Alert archive / Louisiana / Mesoscale Discussions in 2012

Mesoscale Discussion 1137

June 12, 20124 parishes in Louisiana; 4 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at Jun 12, 2012, 9:23 AM CDT for 4 parishes in Louisiana; 4 counties in Texas. It was in force for 67 min.

The area

The outline as issued.

The facts

Issued
Jun 12, 2012, 9:23 AM CDT (14:23 UTC)
Expired
Jun 12, 2012, 10:30 AM CDT
In force
67 min
Issued by
the Storm Prediction Center

Counties Grant Parish, LA, LaSalle Parish, LA, Natchitoches Parish, LA, Sabine Parish, LA, Nacogdoches County, TX, Sabine County, TX, San Augustine County, TX, Shelby County, TX

The nearest sounding before it

Shreveport, LA (KSHV), launched 12:00Z, 2.4 hours before the alert went out and 105 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 2012-06-12Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 17 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 2012-06-12The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -31 square meters per square second.19395878Sfc1 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
17 J/kg
Mixed-layer CIN
-312 J/kg
Mixed-layer LCL
884 m above ground
0-6 km bulk shear
52 kt
0-1 km storm-relative helicity
-31 m²/s²
0-3 km storm-relative helicity
21 m²/s²
Significant tornado parameter
0.0
Supercell composite
-0.1

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 11, 7:33 PM CDTMesoscale DiscussionSPCEast Carroll, Franklin, Madison, Morehouse, Richland, Tensas and 1 more57 min
Jun 11, 8:37 PM CDTSevere Thunderstorm WatchSPCCatahoula, Concordia, East Feliciana, Franklin, Saint Helena, Saint Tammany and 4 more4 hr
Jun 11, 10:51 PM CDTMesoscale DiscussionSPCEast Baton Rouge, East Feliciana, Saint Helena, Tangipahoa, Washington, West Baton Rouge and 1 more54 min
Jun 11, 11:52 PM CDTSevere Thunderstorm WatchSPCBossier, Caddo, Claiborne, Union, Webster6 hr
Jun 12, 2:54 AM CDTMesoscale DiscussionSPCBienville, Bossier, Caddo, Caldwell, Catahoula, Claiborne and 15 more96 min
Jun 12, 3:21 AM CDTSevere Thunderstorm WatchSPCBienville, Bossier, Caddo, Caldwell, Catahoula, Claiborne and 20 more8 hr
Jun 12, 6:08 AM CDTMesoscale DiscussionSPCBienville, Caldwell, Catahoula, Concordia, De Soto, East Carroll and 16 more2 hr
Jun 12, 7:11 AM CDTSevere Thunderstorm WatchSPCAcadia, Allen, Ascension, Assumption, Avoyelles, Beauregard and 32 more8 hr
Jun 12, 12:12 PM CDTMesoscale DiscussionSPCAcadia, Allen, Beauregard, Calcasieu, Cameron, Iberia and 5 more63 min
Jun 11, 7:11 PM CDTMesoscale DiscussionSPCBrown, Callahan, Clay, Coke, Coleman, Collin and 29 more94 min
Jun 11, 9:54 PM CDTMesoscale DiscussionSPCArcher, Baylor, Brown, Callahan, Clay, Coke and 31 more66 min
Jun 11, 11:29 PM CDTMesoscale DiscussionSPCGrayson61 min
Jun 12, 4:08 AM CDTMesoscale DiscussionSPCArmstrong, Bailey, Briscoe, Castro, Childress, Deaf Smith and 9 more2 hr
Jun 12, 10:32 AM CDTMesoscale DiscussionSPCArcher, Clay, Collin, Cooke, Dallas, Denton and 19 more88 min
Jun 12, 11:00 AM CDTSevere Thunderstorm WatchSPCAnderson, Bell, Bosque, Brown, Callahan, Collin and 36 more6 hr
Jun 12, 2:02 PM CDTMesoscale DiscussionSPCDallam, Deaf Smith, Hartley, Oldham88 min
Jun 12, 2:16 PM CDTSevere Thunderstorm WatchSPCDallam, Deaf Smith, Hartley, Oldham8 hr
Jun 12, 2:45 PM CDTMesoscale DiscussionSPCCoke, Coleman, Concho, Glasscock, Midland, Mitchell and 4 more60 min
Jun 12, 3:00 PM CDTMesoscale DiscussionSPCAndrews, Bailey, Cochran, Crane, Ector, Gaines and 7 more60 min
Jun 12, 3:28 PM CDTMesoscale DiscussionSPCAnderson, Bell, Bosque, Brazos, Brown, Burleson and 37 more62 min
Jun 12, 3:44 PM CDTSevere Thunderstorm WatchSPCAndrews, Bailey, Cochran, Crane, Culberson, Ector and 13 more8 hr
Jun 12, 3:56 PM CDTSevere Thunderstorm WatchSPCAnderson, Austin, Bell, Brazoria, Brazos, Burleson and 24 more4 hr
Jun 12, 5:42 PM CDTMesoscale DiscussionSPCDallam63 min

Nearby

Mesoscale Discussions in Louisiana, 2012Mesoscale Discussions in Texas, 2012Every 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.