Alert archive / Texas / Mesoscale Discussions in 2008

Mesoscale Discussion 733

April 25, 200811 counties in Arkansas; McCurtain County, Oklahoma; 23 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at Apr 25, 2008, 5:05 PM CDT for 11 counties in Arkansas; McCurtain County, Oklahoma; 23 counties in Texas. It was in force for 55 min.

The area

The outline as issued.

The facts

Issued: Apr 25, 2008, 5:05 PM CDT (22:05 UTC)
Expired: Apr 25, 2008, 6:00 PM CDT
In force: 55 min
Issued by: the Storm Prediction Center

All 35 counties

Clark County, AR, Hempstead County, AR, Hot Spring County, AR, Howard County, AR, Little River County, AR, Miller County, AR, Montgomery County, AR, Nevada County, AR, Pike County, AR, Polk County, AR, Sevier County, AR, McCurtain County, OK, Anderson County, TX, Bowie County, TX, Camp County, TX, Cass County, TX, Falls County, TX, Franklin County, TX, Freestone County, TX, Gregg County, TX, Harrison County, TX, Henderson County, TX, Hopkins County, TX, Limestone County, TX, Marion County, TX, McLennan County, TX, Morris County, TX, Navarro County, TX, Rains County, TX, Red River County, TX, Smith County, TX, Titus County, TX, Upshur County, TX, Van Zandt County, TX, Wood County, TX

The radar

The Shreveport radar (KSHV), 160 km from the middle of the area, began a volume at 22:08 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

Fort Worth, TX (KFWD), launched 12:00Z, 10.1 hours before the alert went out and 166 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: 1802 J/kg
Mixed-layer CIN: -149 J/kg
Mixed-layer LCL: 545 m above ground
0-6 km bulk shear: 24 kt
0-1 km storm-relative helicity: 280 m²/s²
0-3 km storm-relative helicity: 387 m²/s²
Significant tornado parameter: 0.7
Supercell composite: 4.2

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.

Issued	Product	Office	Counties	Lasted
Apr 25, 2:15 PM CDT	Mesoscale Discussion	SPC	Baxter, Boone, Carroll, Crawford, Franklin, Howard and 14 more	90 min
Apr 25, 3:26 PM CDT	Severe Thunderstorm Watch	SPC	Hempstead, Howard, Little River, Miller, Nevada, Sevier	7 hr
Apr 25, 6:40 PM CDT	Mesoscale Discussion	SPC	Cleburne, Conway, Faulkner, Fulton, Garland, Grant and 16 more	65 min
Apr 25, 6:38 AM CDT	Mesoscale Discussion	SPC	Craig, Creek, Delaware, Kay, Lincoln, Logan and 14 more	67 min
Apr 25, 4:50 PM CDT	Mesoscale Discussion	SPC	Bandera, Bell, Blanco, Burnet, Coryell, Edwards and 15 more	55 min
Apr 25, 5:32 PM CDT	Severe Thunderstorm Watch	SPC	Bandera, Bastrop, Bexar, Blanco, Burnet, Caldwell and 18 more	6 hr

Nearby

Mesoscale Discussions in Texas, 2008 Mesoscale Discussions in Arkansas, 2008 Mesoscale Discussions in Oklahoma, 2008 Every 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.