Alert archive / Oklahoma / Mesoscale Discussions in 2013

Mesoscale Discussion 878

May 30, 201326 counties in Oklahoma; 6 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at May 30, 2013, 12:20 PM CDT for 26 counties in Oklahoma; 6 counties in Texas. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued
May 30, 2013, 12:20 PM CDT (17:20 UTC)
Expired
May 30, 2013, 2:45 PM CDT
In force
2 hr
Issued by
the Storm Prediction Center
Chance of a watch
95%
All 32 counties

Caddo County, OK, Canadian County, OK, Carter County, OK, Cleveland County, OK, Comanche County, OK, Cotton County, OK, Creek County, OK, Garvin County, OK, Grady County, OK, Hughes County, OK, Jefferson County, OK, Johnston County, OK, Lincoln County, OK, Logan County, OK, Love County, OK, McClain County, OK, Murray County, OK, Okfuskee County, OK, Oklahoma County, OK, Okmulgee County, OK, Payne County, OK, Pontotoc County, OK, Pottawatomie County, OK, Seminole County, OK, Stephens County, OK, Tillman County, OK, Archer County, TX, Baylor County, TX, Clay County, TX, Montague County, TX, Wichita County, TX, Wilbarger County, TX

The radar

The Norman radar (KTLX), 68 km from the middle of the area, began a volume at 17:22 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

Norman, OK (KOUN), launched 12:00Z, 5.3 hours before the alert went out and 51 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 2013-05-30Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 2281 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 2013-05-30The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 366 square meters per square second.19395878Sfc1 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
2281 J/kg
Mixed-layer CIN
-7 J/kg
Mixed-layer LCL
542 m above ground
0-6 km bulk shear
33 kt
0-1 km storm-relative helicity
366 m²/s²
0-3 km storm-relative helicity
703 m²/s²
Significant tornado parameter
4.2
Supercell composite
22.1

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 29, 7:36 PM CDTMesoscale DiscussionSPCBeaver, Beckham, Custer, Dewey, Ellis, Greer and 11 more84 min
May 29, 10:25 PM CDTMesoscale DiscussionSPCAtoka, Canadian, Carter, Cleveland, Coal, Creek and 21 more65 min
May 29, 10:44 PM CDTSevere Thunderstorm WatchSPCAdair, Atoka, Blaine, Bryan, Caddo, Canadian and 48 more7 hr
May 30, 3:18 AM CDTMesoscale DiscussionSPCAtoka, Canadian, Carter, Cleveland, Coal, Creek and 21 more87 min
May 30, 11:44 AM CDTMesoscale DiscussionSPCAdair, Cherokee, Craig, Delaware, Haskell, LeFlore and 8 more91 min
May 30, 12:52 PM CDTTornado WatchSPCAtoka, Bryan, Caddo, Canadian, Carter, Cleveland and 38 more10 hr
May 30, 1:21 PM CDTTornado WatchSPCAdair, Cherokee, Choctaw, Delaware, Haskell, Latimer and 5 more8 hr
May 30, 2:35 PM CDTMesoscale DiscussionSPCAdair, Atoka, Carter, Cherokee, Choctaw, Cleveland and 38 more55 min
May 30, 5:23 PM CDTMesoscale DiscussionSPCAdair, Cherokee, Haskell, Latimer, LeFlore, McCurtain and 1 more2 hr
May 30, 5:52 PM CDTMesoscale DiscussionSPCAtoka, Carter, Cherokee, Cleveland, Coal, Comanche and 29 more113 min
May 30, 3:34 AM CDTMesoscale DiscussionSPCBrown, Callahan, Coleman, Comanche, Eastland, Erath and 1 more116 min
May 30, 2:51 PM CDTTornado WatchSPCArcher, Baylor, Clay, Cooke, Fannin, Grayson and 12 more6 hr

Nearby

Mesoscale Discussions in Oklahoma, 2013Mesoscale Discussions in Texas, 2013Every mesoscale discussion in 2013

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.