Alert archive / Arkansas / Mesoscale Discussions in 2008

Mesoscale Discussion 618

April 10, 200828 counties in Arkansas; 9 parishes in Louisiana; 18 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at Apr 10, 2008, 8:32 AM CDT for 28 counties in Arkansas; 9 parishes in Louisiana; 18 counties in Texas. It was in force for 58 min.

The area

The outline as issued.

The facts

Issued
Apr 10, 2008, 8:32 AM CDT (13:32 UTC)
Expired
Apr 10, 2008, 9:30 AM CDT
In force
58 min
Issued by
the Storm Prediction Center
All 55 counties

Ashley County, AR, Bradley County, AR, Calhoun County, AR, Clark County, AR, Cleveland County, AR, Columbia County, AR, Dallas County, AR, Drew County, AR, Garland County, AR, Grant County, AR, Hempstead County, AR, Hot Spring County, AR, Howard County, AR, Jefferson County, AR, Lafayette County, AR, Lincoln County, AR, Little River County, AR, Lonoke County, AR, Miller County, AR, Montgomery County, AR, Nevada County, AR, Ouachita County, AR, Pike County, AR, Prairie County, AR, Pulaski County, AR, Saline County, AR, Sevier County, AR, Union County, AR, Bienville Parish, LA, Bossier Parish, LA, Caddo Parish, LA, Claiborne Parish, LA, De Soto Parish, LA, Lincoln Parish, LA, Red River Parish, LA, Union Parish, LA, Webster Parish, LA, Anderson County, TX, Bowie County, TX, Cass County, TX, Cherokee County, TX, Gregg County, TX, Harrison County, TX, Houston County, TX, Leon County, TX, Marion County, TX, Morris County, TX, Nacogdoches County, TX, Panola County, TX, Robertson County, TX, Rusk County, TX, San Augustine County, TX, Shelby County, TX, Smith County, TX, Upshur County, TX

The radar

The Shreveport radar (KSHV), 53 km from the middle of the area, began a volume at 13:31 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 watches that followed

Watches SPC issued over any of the same counties within four hours of this discussion.

The nearest sounding before it

Shreveport, LA (KSHV), launched 12:00Z, 1.5 hours before the alert went out and 57 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 2008-04-10Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 580 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 2008-04-10The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 323 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
580 J/kg
Mixed-layer CIN
-8 J/kg
Mixed-layer LCL
773 m above ground
0-6 km bulk shear
48 kt
0-1 km storm-relative helicity
323 m²/s²
0-3 km storm-relative helicity
615 m²/s²
Significant tornado parameter
1.4
Supercell composite
7.1

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
Apr 9, 7:28 PM CDTMesoscale DiscussionSPCCrawford, Franklin, Hempstead, Howard, Johnson, Little River and 8 more62 min
Apr 9, 8:10 PM CDTTornado WatchSPCHempstead, Howard, Johnson, Little River, Logan, Montgomery and 6 more6 hr
Apr 9, 10:40 PM CDTTornado WatchSPCCrawford, Franklin, Sebastian7 hr
Apr 10, 1:45 AM CDTTornado WatchSPCBaxter, Boone, Cleburne, Conway, Faulkner, Fulton and 16 more8 hr
Apr 10, 3:00 AM CDTMesoscale DiscussionSPCClay, Craighead, Crittenden, Cross, Greene, Mississippi and 1 more60 min
Apr 10, 3:28 AM CDTTornado WatchSPCClay, Craighead, Crittenden, Cross, Greene, Lawrence and 4 more7 hr
Apr 10, 3:54 AM CDTTornado WatchSPCBenton, Carroll, Crawford, Franklin, Hempstead, Howard and 10 more8 hr
Apr 10, 5:55 AM CDTMesoscale DiscussionSPCCrawford, Franklin, Howard, Johnson, Little River, Logan and 4 more65 min
Apr 10, 8:42 AM CDTTornado WatchSPCArkansas, Ashley, Bradley, Calhoun, Chicot, Clark and 19 more7 hr
Apr 10, 9:27 AM CDTMesoscale DiscussionSPCClay, Cleburne, Conway, Craighead, Crittenden, Cross and 16 more2 hr
Apr 10, 9:51 AM CDTTornado WatchSPCClay, Cleburne, Conway, Craighead, Crittenden, Cross and 19 more7 hr
Apr 10, 10:51 AM CDTMesoscale DiscussionSPCArkansas, Ashley, Bradley, Calhoun, Clay, Cleveland and 28 more84 min
Apr 10, 1:41 PM CDTMesoscale DiscussionSPCArkansas, Ashley, Bradley, Calhoun, Clay, Cleveland and 20 more2 hr
Apr 9, 7:44 PM CDTTornado WatchSPCBorden, Brown, Callahan, Coke, Coleman, Concho and 34 more8 hr
Apr 9, 8:13 PM CDTMesoscale DiscussionSPCAnderson, Bosque, Collin, Cooke, Dallas, Delta and 26 more62 min
Apr 9, 10:01 PM CDTMesoscale DiscussionSPCArcher, Clay, Collin, Cooke, Delta, Denton and 8 more59 min
Apr 9, 11:22 PM CDTMesoscale DiscussionSPCBaylor, Childress, Collingsworth, Cottle, Dickens, Foard and 8 more53 min
Apr 9, 11:46 PM CDTMesoscale DiscussionSPCAndrews, Borden, Brown, Callahan, Coke, Coleman and 35 more59 min
Apr 10, 1:36 AM CDTMesoscale DiscussionSPCArcher, Brown, Callahan, Clay, Coleman, Comanche and 19 more54 min
Apr 10, 3:30 AM CDTMesoscale DiscussionSPCAnderson, Bell, Camp, Collin, Dallas, Delta and 26 more60 min

Nearby

Mesoscale Discussions in Arkansas, 2008Mesoscale Discussions in Texas, 2008Mesoscale Discussions in Louisiana, 2008Every mesoscale discussion in 2008

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.