Alert archive / Oklahoma / Mesoscale Discussions in 2015

Mesoscale Discussion 669

May 16, 201546 counties in Oklahoma; 19 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at May 16, 2015, 5:55 PM CDT for 46 counties in Oklahoma; 19 counties in Texas. It was in force for 95 min.

The area

The outline as issued.

The facts

Issued
May 16, 2015, 5:55 PM CDT (22:55 UTC)
Expired
May 16, 2015, 7:30 PM CDT
In force
95 min
Issued by
the Storm Prediction Center
All 65 counties

Alfalfa County, OK, Beaver County, OK, Beckham County, OK, Blaine County, OK, Bryan County, OK, Caddo County, OK, Canadian County, OK, Carter County, OK, Cleveland County, OK, Coal County, OK, Comanche County, OK, Cotton County, OK, Custer County, OK, Dewey County, OK, Ellis County, OK, Garfield County, OK, Garvin County, OK, Grady County, OK, Grant County, OK, Greer County, OK, Harmon County, OK, Harper County, OK, Jackson County, OK, Jefferson County, OK, Johnston County, OK, Kingfisher County, OK, Kiowa County, OK, Lincoln County, OK, Logan County, OK, Love County, OK, Major County, OK, Marshall County, OK, McClain County, OK, Murray County, OK, Noble County, OK, Oklahoma County, OK, Payne County, OK, Pontotoc County, OK, Pottawatomie County, OK, Roger Mills County, OK, Seminole County, OK, Stephens County, OK, Tillman County, OK, Washita County, OK, Woods County, OK, Woodward County, OK, Archer County, TX, Baylor County, TX, Childress County, TX, Clay County, TX, Collingsworth County, TX, Cooke County, TX, Cottle County, TX, Foard County, TX, Hardeman County, TX, Hemphill County, TX, King County, TX, Knox County, TX, Lipscomb County, TX, Montague County, TX, Ochiltree County, TX, Roberts County, TX, Wheeler County, TX, Wichita County, TX, Wilbarger County, TX

The watches that followed

Watches SPC issued over any of the same counties within four hours of this discussion.

The nearest sounding before it

Norman, OK (KOUN), launched 12:00Z, 10.9 hours before the alert went out and 173 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, Norman, OK at 12:00Z on 2015-05-16Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 538 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, Norman, OK at 12:00Z on 2015-05-16The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 137 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
538 J/kg
Mixed-layer CIN
-4 J/kg
Mixed-layer LCL
590 m above ground
0-6 km bulk shear
29 kt
0-1 km storm-relative helicity
137 m²/s²
0-3 km storm-relative helicity
107 m²/s²
Significant tornado parameter
0.2
Supercell composite
4.6

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
May 15, 8:05 PM CDTMesoscale DiscussionSPCBeaver, Cimarron, Ellis, Harper, Roger Mills, Texas2 hr
May 15, 10:53 PM CDTSevere Thunderstorm WatchSPCBeaver5 hr
May 16, 1:32 AM CDTMesoscale DiscussionSPCBeaver, Ellis, Harmon88 min
May 16, 10:55 AM CDTMesoscale DiscussionSPCBeckham, Blaine, Custer, Dewey, Garfield, Grant and 9 more95 min
May 16, 11:57 AM CDTMesoscale DiscussionSPCBeckham, Greer, Harmon, Jackson, Kiowa, Tillman2 hr
May 16, 12:01 PM CDTMesoscale DiscussionSPCCimarron, Texas89 min
May 16, 12:58 PM CDTTornado WatchSPCBeaver, Beckham, Greer, Harmon, Jackson, Roger Mills and 2 more6 hr
May 16, 3:04 PM CDTMesoscale DiscussionSPCGrant, Kay86 min
May 16, 3:41 PM CDTMesoscale DiscussionSPCAlfalfa, Atoka, Beckham, Blaine, Bryan, Caddo and 42 more94 min
May 16, 4:00 PM CDTTornado WatchSPCAlfalfa, Atoka, Blaine, Bryan, Caddo, Canadian and 37 more8 hr
May 16, 2:43 PM CDTMesoscale DiscussionSPCCallahan, Coke, Coleman, Concho, Crockett, Glasscock and 18 more92 min
May 16, 5:47 PM CDTTornado WatchSPCBrown, Callahan, Coke, Coleman, Comanche, Cooke and 21 more5 hr

Nearby

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