Alert archive / Oklahoma / Mesoscale Discussions in 2007

Mesoscale Discussion 1801

August 19, 200715 counties in Oklahoma

The Storm Prediction Center issued this mesoscale discussion at Aug 19, 2007, 7:27 AM CDT for 15 counties in Oklahoma. It was in force for 63 min.

The area

The outline as issued.

The facts

Issued: Aug 19, 2007, 7:27 AM CDT (12:27 UTC)
Expired: Aug 19, 2007, 8:30 AM CDT
In force: 63 min
Issued by: the Storm Prediction Center

Counties Canadian County, OK, Carter County, OK, Cleveland County, OK, Garvin County, OK, Grady County, OK, Jefferson County, OK, Kingfisher County, OK, Lincoln County, OK, Logan County, OK, McClain County, OK, Murray County, OK, Oklahoma County, OK, Payne County, OK, Pottawatomie County, OK, Stephens County, OK

The radar

The Norman radar (KTLX), 73 km from the middle of the area, began a volume at 12:26 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, 0.5 hours before the alert went out and 57 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: 538 J/kg
Mixed-layer CIN: -11 J/kg
Mixed-layer LCL: 523 m above ground
0-6 km bulk shear: 17 kt
0-1 km storm-relative helicity: 165 m²/s²
0-3 km storm-relative helicity: 193 m²/s²
Significant tornado parameter: 0.4
Supercell composite: 2.1

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.

Issued	Product	Office	Counties	Lasted
Aug 18, 11:36 PM CDT	Mesoscale Discussion	SPC	Blaine, Caddo, Canadian, Comanche, Custer, Grady and 3 more	3 hr
Aug 19, 1:46 AM CDT	Mesoscale Discussion	SPC	Blaine, Caddo, Canadian, Carter, Cleveland, Comanche and 15 more	59 min
Aug 19, 2:51 AM CDT	Tornado Watch	SPC	Blaine, Canadian, Cleveland, Comanche, Cotton, Garvin and 10 more	5 hr
Aug 19, 1:58 PM CDT	Mesoscale Discussion	SPC	Adair, Cherokee, Craig, Delaware, Haskell, McIntosh and 7 more	3 hr

Nearby

Mesoscale Discussions in Oklahoma, 2007 Every mesoscale discussion in 2007

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.