Alert archive / Oklahoma / Mesoscale Discussions in 2023

Mesoscale Discussion 770

May 11, 20234 counties in Oklahoma

The Storm Prediction Center issued this mesoscale discussion at May 11, 2023, 10:01 PM CDT for 4 counties in Oklahoma. It was in force for 89 min.

The area

The outline as issued.

The facts

Issued: May 11, 2023, 10:01 PM CDT (03:01 UTC)
Expired: May 11, 2023, 11:30 PM CDT
In force: 89 min
Issued by: the Storm Prediction Center
Concerning: Tornado watch 213

Counties Cleveland County, OK, McClain County, OK, Pottawatomie County, OK, Seminole County, OK

The radar

The Norman radar (KTLX), 40 km from the middle of the area, began a volume at 03:02 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 00:00Z, 3.0 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-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: 2756 J/kg
Mixed-layer CIN: -1 J/kg
Mixed-layer LCL: 721 m above ground
0-6 km bulk shear: 39 kt
0-1 km storm-relative helicity: 162 m²/s²
0-3 km storm-relative helicity: 237 m²/s²
Significant tornado parameter: 2.0
Supercell composite: 11.5

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 11, 7:07 PM CDT	Mesoscale Discussion	SPC	Cleveland, Oklahoma	53 min
May 11, 8:41 PM CDT	Mesoscale Discussion	SPC	Cleveland, McClain	94 min
May 11, 11:37 PM CDT	Tornado Watch	SPC	Haskell, Latimer, LeFlore, Pittsburg, Pushmataha	3 hr
May 12, 1:07 AM CDT	Mesoscale Discussion	SPC	Atoka, Coal, Haskell, Latimer, LeFlore, Pittsburg and 1 more	113 min
May 12, 1:20 PM CDT	Mesoscale Discussion	SPC	Carter, Cotton, Garvin, Jefferson, Love, Marshall and 2 more	3 hr
May 12, 3:39 PM CDT	Severe Thunderstorm Watch	SPC	Blaine, Caddo, Canadian, Carter, Cleveland, Coal and 37 more	10 hr

Nearby

Mesoscale Discussions in Oklahoma, 2023 Every mesoscale discussion in 2023

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.