Alert archive / Oklahoma / Mesoscale Discussions in 2018

Mesoscale Discussion 580

May 30, 201815 counties in Kansas; 30 counties in Oklahoma

The Storm Prediction Center issued this mesoscale discussion at May 30, 2018, 8:22 PM CDT for 15 counties in Kansas; 30 counties in Oklahoma. It was in force for 53 min.

The area

The outline as issued.

The facts

Issued: May 30, 2018, 8:22 PM CDT (01:22 UTC)
Expired: May 30, 2018, 9:15 PM CDT
In force: 53 min
Issued by: the Storm Prediction Center
Chance of a watch: 80%

All 45 counties

Barber County, KS, Butler County, KS, Chautauqua County, KS, Comanche County, KS, Cowley County, KS, Elk County, KS, Greenwood County, KS, Harper County, KS, Kingman County, KS, Kiowa County, KS, Montgomery County, KS, Pratt County, KS, Sedgwick County, KS, Sumner County, KS, Wilson County, KS, Alfalfa County, OK, Blaine County, OK, Canadian County, OK, Craig County, OK, Creek County, OK, Custer County, OK, Dewey County, OK, Ellis County, OK, Garfield County, OK, Grant County, OK, Harper County, OK, Kay County, OK, Kingfisher County, OK, Lincoln County, OK, Logan County, OK, Major County, OK, Noble County, OK, Nowata County, OK, Okfuskee County, OK, Oklahoma County, OK, Okmulgee County, OK, Osage County, OK, Pawnee County, OK, Payne County, OK, Rogers County, OK, Tulsa County, OK, Wagoner County, OK, Washington County, OK, Woods County, OK, Woodward County, OK

The radar

The Vance AFB radar (KVNX), 39 km from the middle of the area, began a volume at 01:20 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.

Severe Thunderstorm Watch 135May 30, 9:10 PM CDT

The nearest sounding before it

Norman, OK (KOUN), launched 00:00Z, 1.4 hours before the alert went out and 152 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: 2577 J/kg
Mixed-layer CIN: -72 J/kg
Mixed-layer LCL: 1392 m above ground
0-6 km bulk shear: 39 kt
0-1 km storm-relative helicity: 66 m²/s²
0-3 km storm-relative helicity: 223 m²/s²
Significant tornado parameter: 1.2
Supercell composite: 11.1

Open this sounding in Storm Lab

The text

As transmitted.

<!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 30, 9:14 PM CDT	Severe Thunderstorm Watch	SPC	Allen, Barber, Butler, Chautauqua, Clark, Comanche and 12 more	8 hr
May 30, 10:40 PM CDT	Mesoscale Discussion	SPC	Barber, Butler, Chautauqua, Comanche, Cowley, Elk and 4 more	2 hr
May 31, 2:59 AM CDT	Mesoscale Discussion	SPC	Allen, Bourbon, Cherokee, Crawford, Labette, Montgomery and 3 more	61 min
May 31, 1:07 AM CDT	Mesoscale Discussion	SPC	Noble, Pawnee	53 min

Nearby

Mesoscale Discussions in Oklahoma, 2018 Mesoscale Discussions in Kansas, 2018 Every mesoscale discussion in 2018

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.