Alert archive / Texas / Mesoscale Discussions in 2015

Mesoscale Discussion 581

May 10, 20154 counties in Arkansas; 4 counties in Oklahoma; 21 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at May 10, 2015, 6:44 AM CDT for 4 counties in Arkansas; 4 counties in Oklahoma; 21 counties in Texas. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued: May 10, 2015, 6:44 AM CDT (11:44 UTC)
Expired: May 10, 2015, 8:45 AM CDT
In force: 2 hr
Issued by: the Storm Prediction Center
Chance of a watch: 20%

All 29 counties

Howard County, AR, Little River County, AR, Polk County, AR, Sevier County, AR, Bryan County, OK, Choctaw County, OK, McCurtain County, OK, Pushmataha County, OK, Bowie County, TX, Camp County, TX, Collin County, TX, Dallas County, TX, Delta County, TX, Denton County, TX, Ellis County, TX, Fannin County, TX, Franklin County, TX, Grayson County, TX, Hopkins County, TX, Hunt County, TX, Kaufman County, TX, Lamar County, TX, Morris County, TX, Rains County, TX, Red River County, TX, Rockwall County, TX, Titus County, TX, Van Zandt County, TX, Wood County, TX

The radar

The Dallas/Ft Worth radar (KFWS), 201 km from the middle of the area, began a volume at 11:48 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

Fort Worth, TX (KFWD), launched 00:00Z, 11.7 hours before the alert went out and 184 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: 2343 J/kg
Mixed-layer CIN: -10 J/kg
Mixed-layer LCL: 1015 m above ground
0-6 km bulk shear: 46 kt
0-1 km storm-relative helicity: 316 m²/s²
0-3 km storm-relative helicity: 396 m²/s²
Significant tornado parameter: 5.1
Supercell composite: 26.9

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
May 9, 8:46 PM CDT	Mesoscale Discussion	SPC	Calhoun, Clark, Cleveland, Columbia, Dallas, Grant and 6 more	59 min
May 10, 2:39 AM CDT	Mesoscale Discussion	SPC	Cleburne, Conway, Franklin, Independence, Jackson, Johnson and 4 more	66 min
May 10, 8:56 AM CDT	Mesoscale Discussion	SPC	Crawford, Polk, Sebastian	2 hr
May 10, 9:28 AM CDT	Tornado Watch	SPC	Benton, Boone, Carroll, Crawford, Franklin, Howard and 13 more	6 hr
May 10, 10:19 AM CDT	Tornado Watch	SPC	Howard, Little River, Sevier	13 hr
May 10, 11:25 AM CDT	Mesoscale Discussion	SPC	Clark, Cleburne, Conway, Dallas, Faulkner, Franklin and 26 more	2 hr
May 10, 12:58 PM CDT	Tornado Watch	SPC	Crawford, Franklin, Sebastian	10 hr
May 10, 2:42 PM CDT	Mesoscale Discussion	SPC	Little River	2 hr
May 10, 5:05 PM CDT	Mesoscale Discussion	SPC	Clay, Cleburne, Conway, Craighead, Cross, Faulkner and 19 more	115 min
May 10, 6:15 PM CDT	Mesoscale Discussion	SPC	Columbia, Hempstead, Howard, Lafayette, Little River, Miller and 2 more	90 min
May 9, 7:49 PM CDT	Mesoscale Discussion	SPC	Atoka, Bryan, Carter, Choctaw, Jefferson, Johnston and 4 more	56 min
May 10, 4:20 AM CDT	Mesoscale Discussion	SPC	Atoka, Bryan, Carter, Choctaw, Coal, Cotton and 9 more	55 min
May 10, 12:33 PM CDT	Mesoscale Discussion	SPC	Carter, Cleveland, Cotton, Garvin, Grady, Jefferson and 12 more	2 hr
May 10, 3:22 PM CDT	Mesoscale Discussion	SPC	Atoka, Carter, Cleveland, Coal, Creek, Garvin and 24 more	53 min
May 10, 5:39 PM CDT	Mesoscale Discussion	SPC	Atoka, Bryan, Carter, Choctaw, Cleveland, Creek and 12 more	96 min
May 9, 8:06 PM CDT	Mesoscale Discussion	SPC	Dimmit, Frio, Kinney, La Salle, Maverick, Uvalde and 2 more	84 min
May 9, 9:38 PM CDT	Mesoscale Discussion	SPC	Brown, Callahan, Coke, Coleman, Comanche, Concho and 12 more	2 hr
May 9, 10:51 PM CDT	Severe Thunderstorm Watch	SPC	Bosque, Brown, Callahan, Coke, Coleman, Comanche and 33 more	10 hr
May 10, 2:06 AM CDT	Mesoscale Discussion	SPC	Brown, Callahan, Coleman, Concho, Crockett, Irion and 6 more	54 min
May 10, 2:55 AM CDT	Severe Thunderstorm Watch	SPC	Bosque, Collin, Comanche, Coryell, Dallas, Denton and 22 more	6 hr
May 10, 9:49 AM CDT	Mesoscale Discussion	SPC	Bell, Blanco, Bosque, Brown, Burnet, Camp and 49 more	2 hr

Nearby

Mesoscale Discussions in Texas, 2015 Mesoscale Discussions in Arkansas, 2015 Mesoscale Discussions in Oklahoma, 2015 Every mesoscale discussion in 2015

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.