Alert archive / Oklahoma / Mesoscale Discussions in 2008

Mesoscale Discussion 600

April 9, 200831 counties in Oklahoma

The Storm Prediction Center issued this mesoscale discussion at Apr 9, 2008, 3:07 PM CDT for 31 counties in Oklahoma. It was in force for 53 min.

The area

The outline as issued.

The facts

Issued: Apr 9, 2008, 3:07 PM CDT (20:07 UTC)
Expired: Apr 9, 2008, 4:00 PM CDT
In force: 53 min
Issued by: the Storm Prediction Center

All 31 counties

Blaine County, OK, Caddo County, OK, Canadian County, OK, Cleveland County, OK, Comanche County, OK, Cotton County, OK, Creek County, OK, Custer County, OK, Dewey County, OK, Garfield County, OK, Garvin County, OK, Grady County, OK, Hughes County, OK, Jefferson County, OK, Kingfisher County, OK, Kiowa County, OK, Lincoln County, OK, Logan County, OK, McClain County, OK, Murray County, OK, Noble County, OK, Okfuskee County, OK, Oklahoma County, OK, Pawnee County, OK, Payne County, OK, Pontotoc County, OK, Pottawatomie County, OK, Seminole County, OK, Stephens County, OK, Tillman County, OK, Washita County, OK

The radar

The Norman radar (KTLX), 42 km from the middle of the area, began a volume at 20:07 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, 8.1 hours before the alert went out and 31 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 1422 m above ground
0-6 km bulk shear: 57 kt
0-1 km storm-relative helicity: 169 m²/s²
0-3 km storm-relative helicity: 338 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

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
Apr 8, 10:36 PM CDT	Mesoscale Discussion	SPC	McCurtain	84 min
Apr 8, 11:51 PM CDT	Severe Thunderstorm Watch	SPC	McCurtain	5 hr
Apr 9, 3:29 AM CDT	Mesoscale Discussion	SPC	McCurtain	61 min
Apr 9, 9:06 AM CDT	Mesoscale Discussion	SPC	Beckham, Blaine, Caddo, Comanche, Cotton, Custer and 9 more	54 min
Apr 9, 9:35 AM CDT	Severe Thunderstorm Watch	SPC	Beckham, Caddo, Comanche, Cotton, Custer, Grady and 9 more	6 hr
Apr 9, 12:24 PM CDT	Mesoscale Discussion	SPC	Atoka, Beckham, Blaine, Bryan, Caddo, Canadian and 29 more	66 min
Apr 9, 3:33 PM CDT	Mesoscale Discussion	SPC	Atoka, Bryan, Carter, Choctaw, Coal, Johnston and 5 more	27 min
Apr 9, 3:48 PM CDT	Tornado Watch PDS	SPC	Atoka, Bryan, Carter, Choctaw, Coal, Johnston and 6 more	7 hr
Apr 9, 5:38 PM CDT	Tornado Watch	SPC	Adair, Cherokee, Delaware, Haskell, Hughes, Latimer and 11 more	5 hr
Apr 9, 6:12 PM CDT	Mesoscale Discussion	SPC	Jackson	63 min
Apr 9, 6:55 PM CDT	Severe Thunderstorm Watch	SPC	Caddo, Canadian, Cleveland, Comanche, Cotton, Garvin and 15 more	8 hr

Nearby

Mesoscale Discussions in Oklahoma, 2008 Every mesoscale discussion in 2008

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.