Alert archive / Arkansas / Mesoscale Discussions in 2006

Mesoscale Discussion 552

April 18, 200638 counties in Arkansas; McCurtain County, Oklahoma; 11 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at Apr 18, 2006, 9:43 PM CDT for 38 counties in Arkansas; McCurtain County, Oklahoma; 11 counties in Texas. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued
Apr 18, 2006, 9:43 PM CDT (02:43 UTC)
Expired
Apr 18, 2006, 11:45 PM CDT
In force
2 hr
Issued by
the Storm Prediction Center
All 50 counties

Clark County, AR, Cleburne County, AR, Conway County, AR, Dallas County, AR, Faulkner County, AR, Garland County, AR, Grant County, AR, Hempstead County, AR, Hot Spring County, AR, Howard County, AR, Independence County, AR, Izard County, AR, Jackson County, AR, Lafayette County, AR, Lawrence County, AR, Little River County, AR, Logan County, AR, Lonoke County, AR, Miller County, AR, Montgomery County, AR, Nevada County, AR, Ouachita County, AR, Perry County, AR, Pike County, AR, Polk County, AR, Pope County, AR, Pulaski County, AR, Randolph County, AR, Saline County, AR, Scott County, AR, Searcy County, AR, Sevier County, AR, Sharp County, AR, Stone County, AR, Van Buren County, AR, White County, AR, Woodruff County, AR, Yell County, AR, McCurtain County, OK, Bowie County, TX, Camp County, TX, Cass County, TX, Delta County, TX, Franklin County, TX, Hopkins County, TX, Lamar County, TX, Morris County, TX, Red River County, TX, Titus County, TX, Wood County, TX

The radar

The Little Rock radar (KLZK), 105 km from the middle of the area, began a volume at 02:43 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

Springfield, MO (KSGF), launched 00:00Z, 2.7 hours before the alert went out and 258 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, Springfield, MO at 00:00Z on 2006-04-19Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1677 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, Springfield, MO at 00:00Z on 2006-04-19The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 42 square meters per square second.193958Sfc1 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
1677 J/kg
Mixed-layer CIN
-13 J/kg
Mixed-layer LCL
2485 m above ground
0-6 km bulk shear
26 kt
0-1 km storm-relative helicity
42 m²/s²
0-3 km storm-relative helicity
58 m²/s²
Significant tornado parameter
0.0
Supercell composite
1.0

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.

IssuedProductOfficeCountiesLasted
Apr 19, 12:35 PM CDTMesoscale DiscussionSPCAshley, Columbia, Union115 min
Apr 19, 1:57 PM CDTSevere Thunderstorm WatchSPCAshley, Chicot, Columbia, Lafayette, Miller, Union7 hr
Apr 19, 3:55 PM CDTMesoscale DiscussionSPCAshley, Bradley, Chicot, Columbia, Drew, Lafayette and 2 more2 hr
Apr 18, 7:50 PM CDTMesoscale DiscussionSPCBandera, Blanco, Comal, Gillespie, Hays, Kendall and 3 more115 min
Apr 19, 2:01 PM CDTMesoscale DiscussionSPCBandera, Bell, Blanco, Burnet, Edwards, Falls and 14 more119 min
Apr 19, 3:18 PM CDTMesoscale DiscussionSPCBosque, Brown, Coleman, Collin, Comanche, Concho and 18 more117 min
Apr 19, 3:49 PM CDTSevere Thunderstorm WatchSPCBandera, Blanco, Burnet, Concho, Edwards, Gillespie and 18 more7 hr
Apr 19, 5:12 PM CDTMesoscale DiscussionSPCBosque, Camp, Comanche, Dallas, Ellis, Erath and 18 more2 hr
Apr 19, 5:53 PM CDTMesoscale DiscussionSPCBandera, Blanco, Burnet, Comal, Concho, Edwards and 20 more2 hr

Nearby

Mesoscale Discussions in Arkansas, 2006Mesoscale Discussions in Texas, 2006Mesoscale Discussions in Oklahoma, 2006Every mesoscale discussion in 2006

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.