Alert archive / Louisiana / Mesoscale Discussions in 2007

Mesoscale Discussion 200

February 24, 200718 parishes in Louisiana; Newton County, Orange County, Texas

The Storm Prediction Center issued this mesoscale discussion at Feb 24, 2007, 4:31 PM CST for 18 parishes in Louisiana; Newton County, Orange County, Texas. It was in force for 59 min.

The area

The outline as issued.

The facts

Issued
Feb 24, 2007, 4:31 PM CST (22:31 UTC)
Expired
Feb 24, 2007, 5:30 PM CST
In force
59 min
Issued by
the Storm Prediction Center

Counties Acadia Parish, LA, Allen Parish, LA, Avoyelles Parish, LA, Beauregard Parish, LA, Calcasieu Parish, LA, Cameron Parish, LA, East Baton Rouge Parish, LA, Evangeline Parish, LA, Iberville Parish, LA, Jefferson Davis Parish, LA, Lafayette Parish, LA, Pointe Coupee Parish, LA, Saint Landry Parish, LA, Saint Martin Parish, LA, Vermilion Parish, LA, Vernon Parish, LA, West Baton Rouge Parish, LA, West Feliciana Parish, LA, Newton County, TX, Orange County, TX

The radar

The Lake Charles radar (KLCH), 65 km from the middle of the area, began a volume at 22:32 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, 10.5 hours before the alert went out and 238 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 2007-02-24Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 144 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 2007-02-24The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 513 square meters per square second.1939587897Sfc1 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
144 J/kg
Mixed-layer CIN
-313 J/kg
Mixed-layer LCL
511 m above ground
0-6 km bulk shear
47 kt
0-1 km storm-relative helicity
513 m²/s²
0-3 km storm-relative helicity
661 m²/s²
Significant tornado parameter
0.0
Supercell composite
7.2

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
Feb 24, 8:29 AM CSTMesoscale DiscussionSPCBienville, Bossier, Caddo, Claiborne, Webster61 min
Feb 24, 8:47 AM CSTTornado Watch PDSSPCBienville, Bossier, Caddo, Claiborne, De Soto, Jackson and 7 more9 hr
Feb 24, 10:35 AM CSTMesoscale DiscussionSPCBienville, Bossier, Caddo, Caldwell, Claiborne, De Soto and 11 more115 min
Feb 24, 1:10 PM CSTTornado Watch PDSSPCCaldwell, Catahoula, Concordia, East Carroll, Franklin, Grant and 7 more7 hr
Feb 24, 1:45 PM CSTMesoscale DiscussionSPCUnion2 hr
Feb 24, 3:49 PM CSTMesoscale DiscussionSPCMorehouse, West Carroll86 min
Feb 23, 6:15 PM CSTMesoscale DiscussionSPCArmstrong, Briscoe, Childress, Collingsworth, Cottle, Crosby and 19 more90 min
Feb 23, 7:35 PM CSTMesoscale DiscussionSPCWichita, Wilbarger85 min
Feb 23, 9:01 PM CSTMesoscale DiscussionSPCArcher, Armstrong, Baylor, Briscoe, Childress, Clay and 28 more89 min
Feb 23, 9:26 PM CSTTornado WatchSPCArcher, Baylor, Callahan, Childress, Clay, Collingsworth and 35 more9 hr
Feb 23, 11:35 PM CSTMesoscale DiscussionSPCCollin, Cooke, Dallas, Delta, Denton, Ellis and 12 more115 min
Feb 24, 3:38 AM CSTMesoscale DiscussionSPCArcher, Baylor, Callahan, Clay, Cooke, Eastland and 19 more97 min
Feb 24, 5:20 AM CSTMesoscale DiscussionSPCComanche, Cooke, Eastland, Erath, Hood, Jack and 4 more55 min

Nearby

Mesoscale Discussions in Louisiana, 2007Mesoscale Discussions in Texas, 2007Every mesoscale discussion in 2007

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.