Alert archive / Oklahoma / Mesoscale Discussions in 2018

Mesoscale Discussion 334

May 3, 20184 counties in Arkansas; 10 counties in Oklahoma

The Storm Prediction Center issued this mesoscale discussion at May 3, 2018, 9:02 AM CDT for 4 counties in Arkansas; 10 counties in Oklahoma. It was in force for 88 min.

The area

The outline as issued.

The facts

Issued: May 3, 2018, 9:02 AM CDT (14:02 UTC)
Expired: May 3, 2018, 10:30 AM CDT
In force: 88 min
Issued by: the Storm Prediction Center
Chance of a watch: 20%

Counties Crawford County, AR, Franklin County, AR, Sebastian County, AR, Washington County, AR, Adair County, OK, Cherokee County, OK, Haskell County, OK, Hughes County, OK, Latimer County, OK, LeFlore County, OK, McIntosh County, OK, Muskogee County, OK, Pittsburg County, OK, Sequoyah County, OK

The radar

The Western Arkansas radar (KSRX), 76 km from the middle of the area, began a volume at 14:05 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

Norman, OK (KOUN), launched 12:00Z, 2.0 hours before the alert went out and 201 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: 236 J/kg
Mixed-layer CIN: -135 J/kg
Mixed-layer LCL: 974 m above ground
0-6 km bulk shear: 59 kt
0-1 km storm-relative helicity: 85 m²/s²
0-3 km storm-relative helicity: 244 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.1

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 2, 10:20 PM CDT	Mesoscale Discussion	SPC	Baxter, Benton, Boone, Carroll, Crawford, Franklin and 6 more	115 min
May 2, 11:09 PM CDT	Severe Thunderstorm Watch	SPC	Baxter, Benton, Boone, Carroll, Crawford, Franklin and 12 more	7 hr
May 3, 2:32 AM CDT	Mesoscale Discussion	SPC	Baxter, Boone, Carroll, Franklin, Fulton, Izard and 6 more	88 min
May 3, 12:35 PM CDT	Mesoscale Discussion	SPC	Boone, Carroll, Clark, Conway, Crawford, Franklin and 22 more	85 min
May 3, 1:44 PM CDT	Severe Thunderstorm Watch	SPC	Baxter, Clark, Clay, Cleburne, Conway, Craighead and 34 more	4 hr
May 3, 3:45 PM CDT	Mesoscale Discussion	SPC	Arkansas, Clark, Clay, Cleburne, Cleveland, Craighead and 25 more	60 min
May 3, 4:52 PM CDT	Mesoscale Discussion	SPC	Baxter, Clark, Clay, Cleburne, Cleveland, Conway and 31 more	53 min
May 2, 7:14 PM CDT	Mesoscale Discussion	SPC	Atoka, Cherokee, Coal, Craig, Creek, Delaware and 18 more	2 hr
May 2, 8:05 PM CDT	Tornado Watch	SPC	Adair, Atoka, Bryan, Carter, Cherokee, Choctaw and 30 more	6 hr
May 2, 11:09 PM CDT	Mesoscale Discussion	SPC	Adair, Atoka, Bryan, Carter, Cherokee, Coal and 26 more	96 min
May 3, 4:06 AM CDT	Mesoscale Discussion	SPC	Bryan, Carter, Cleveland, Coal, Comanche, Cotton and 14 more	114 min
May 3, 5:18 AM CDT	Severe Thunderstorm Watch	SPC	Atoka, Bryan, Carter, Coal, Comanche, Cotton and 11 more	6 hr
May 3, 9:55 AM CDT	Mesoscale Discussion	SPC	Carter, Coal, Comanche, Cotton, Garvin, Jefferson and 7 more	65 min

Nearby

Mesoscale Discussions in Oklahoma, 2018 Mesoscale Discussions in Arkansas, 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.