Alert archive / Oklahoma / Mesoscale Discussions in 2015

Mesoscale Discussion 738

May 24, 20154 counties in Oklahoma; Collin County, Fannin County, Grayson County, Texas

The Storm Prediction Center issued this mesoscale discussion at May 24, 2015, 3:16 AM CDT for 4 counties in Oklahoma; Collin County, Fannin County, Grayson County, Texas. It was in force for 59 min.

The area

The outline as issued.

The facts

Issued: May 24, 2015, 3:16 AM CDT (08:16 UTC)
Expired: May 24, 2015, 4:15 AM CDT
In force: 59 min
Issued by: the Storm Prediction Center

Counties Bryan County, OK, Choctaw County, OK, LeFlore County, OK, Pushmataha County, OK, Collin County, TX, Fannin County, TX, Grayson County, TX

The radar

The Western Arkansas radar (KSRX), 178 km from the middle of the area, began a volume at 08:17 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

Norman, OK (KOUN), launched 00:00Z, 8.3 hours before the alert went out and 195 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: 1041 J/kg
Mixed-layer CIN: -2 J/kg
Mixed-layer LCL: 590 m above ground
0-6 km bulk shear: 42 kt
0-1 km storm-relative helicity: 309 m²/s²
0-3 km storm-relative helicity: 342 m²/s²
Significant tornado parameter: 2.0
Supercell composite: 24.3

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 23, 8:57 PM CDT	Mesoscale Discussion	SPC	Adair, Atoka, Bryan, Carter, Cherokee, Choctaw and 38 more	93 min
May 23, 10:49 PM CDT	Mesoscale Discussion	SPC	Adair, Cherokee, Choctaw, Craig, Delaware, Haskell and 11 more	86 min
May 23, 8:39 PM CDT	Mesoscale Discussion	SPC	Atascosa, Bastrop, Bee, Bexar, Blanco, Caldwell and 18 more	2 hr
May 23, 9:46 PM CDT	Mesoscale Discussion	SPC	Anderson, Austin, Bell, Bosque, Brazos, Burleson and 28 more	89 min
May 23, 10:00 PM CDT	Tornado Watch	SPC	Anderson, Austin, Bell, Bosque, Brazos, Burleson and 34 more	6 hr
May 23, 10:31 PM CDT	Severe Thunderstorm Watch	SPC	Aransas, Brooks, Cameron, Hidalgo, Jim Hogg, Jim Wells and 8 more	5 hr
May 23, 11:32 PM CDT	Mesoscale Discussion	SPC	Anderson, Atascosa, Austin, Bell, Brazos, Burleson and 36 more	88 min
May 23, 11:52 PM CDT	Mesoscale Discussion	SPC	Brooks, Cameron, Duval, Hidalgo, Jim Wells, Kenedy and 3 more	83 min
May 23, 11:59 PM CDT	Mesoscale Discussion	SPC	Bandera, Gillespie, Kendall, Kerr, Kinney, Real and 2 more	91 min
May 24, 2:12 AM CDT	Mesoscale Discussion	SPC	Aransas, Brazoria, Calhoun, Cameron, Fort Bend, Jackson and 4 more	93 min
May 24, 12:05 PM CDT	Mesoscale Discussion	SPC	Bowie, Cass, Marion	115 min
May 24, 12:34 PM CDT	Tornado Watch	SPC	Bowie, Cass, Morris	6 hr
May 24, 3:15 PM CDT	Mesoscale Discussion	SPC	Armstrong, Briscoe, Callahan, Childress, Coleman, Collingsworth and 26 more	90 min

Nearby

Mesoscale Discussions in Oklahoma, 2015 Mesoscale Discussions in Texas, 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.