Alert archive / Texas / Mesoscale Discussions in 2015

Mesoscale Discussion 814

May 27, 2015Lea County, Roosevelt County, New Mexico; 29 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at May 27, 2015, 4:05 PM MDT for Lea County, Roosevelt County, New Mexico; 29 counties in Texas. It was in force for 115 min.

The area

The outline as issued.

The facts

Issued: May 27, 2015, 4:05 PM MDT (22:05 UTC)
Expired: May 27, 2015, 6:00 PM MDT
In force: 115 min
Issued by: the Storm Prediction Center
Chance of a watch: 60%

All 31 counties

Lea County, NM, Roosevelt County, NM, Andrews County, TX, Bailey County, TX, Borden County, TX, Briscoe County, TX, Castro County, TX, Cochran County, TX, Crosby County, TX, Dawson County, TX, Dickens County, TX, Ector County, TX, Floyd County, TX, Gaines County, TX, Garza County, TX, Hale County, TX, Hall County, TX, Hockley County, TX, Howard County, TX, Kent County, TX, Lamb County, TX, Loving County, TX, Lubbock County, TX, Lynn County, TX, Martin County, TX, Motley County, TX, Parmer County, TX, Swisher County, TX, Terry County, TX, Winkler County, TX, Yoakum County, TX

The radar

The Lubbock radar (KLBB), 87 km from the middle of the area, began a volume at 22:05 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

Midland Regional, TX (KMAF), launched 12:00Z, 10.1 hours before the alert went out and 125 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: 1869 J/kg
Mixed-layer CIN: -147 J/kg
Mixed-layer LCL: 988 m above ground
0-6 km bulk shear: 35 kt
0-1 km storm-relative helicity: 87 m²/s²
0-3 km storm-relative helicity: 74 m²/s²
Significant tornado parameter: 0.1
Supercell composite: 2.9

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 26, 7:25 PM MDT	Mesoscale Discussion	SPC	Coke, Coleman, Concho, Irion, Kimble, McCulloch and 6 more	95 min
May 26, 7:51 PM MDT	Mesoscale Discussion	SPC	Callahan, Comanche, Eastland, Erath, Hood, Jack and 8 more	84 min
May 26, 8:27 PM MDT	Severe Thunderstorm Watch	SPC	Bosque, Brown, Callahan, Coleman, Collin, Comanche and 37 more	6 hr
May 26, 10:47 PM MDT	Mesoscale Discussion	SPC	Anderson, Bell, Bosque, Comanche, Coryell, Erath and 16 more	88 min
May 27, 3:48 AM MDT	Mesoscale Discussion	SPC	Austin, Chambers, Fort Bend, Hardin, Harris, Jasper and 13 more	117 min
May 27, 10:39 AM MDT	Mesoscale Discussion	SPC	Atascosa, Bandera, Bexar, Blanco, Caldwell, Comal and 16 more	66 min
May 27, 1:13 PM MDT	Mesoscale Discussion	SPC	Childress, Collingsworth, Donley, Gray, Hemphill, Lipscomb and 3 more	92 min
May 27, 1:46 PM MDT	Tornado Watch	SPC	Armstrong, Carson, Collingsworth, Donley, Gray, Hansford and 7 more	10 hr
May 27, 2:09 PM MDT	Mesoscale Discussion	SPC	Archer, Baylor, Brown, Callahan, Clay, Coleman and 18 more	2 hr
May 27, 5:16 PM MDT	Mesoscale Discussion	SPC	Collingsworth, Donley, Gray, Hansford, Hemphill, Lipscomb and 3 more	119 min

Nearby

Mesoscale Discussions in Texas, 2015 Mesoscale Discussions in New Mexico, 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.