Alert archive / Oklahoma / Mesoscale Discussions in 2004

Mesoscale Discussion 458

April 23, 200410 counties in Oklahoma

The Storm Prediction Center issued this mesoscale discussion at Apr 23, 2004, 7:56 PM CDT for 10 counties in Oklahoma. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued: Apr 23, 2004, 7:56 PM CDT (00:56 UTC)
Expired: Apr 23, 2004, 10:00 PM CDT
In force: 2 hr
Issued by: the Storm Prediction Center

Counties Adair County, OK, Atoka County, OK, Cherokee County, OK, Coal County, OK, Haskell County, OK, Johnston County, OK, McIntosh County, OK, Muskogee County, OK, Pittsburg County, OK, Sequoyah County, OK

The radar

The Tulsa radar (KINX), 106 km from the middle of the area, began a volume at 00:57 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, 0.9 hours before the alert went out and 165 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: 8 J/kg
Mixed-layer CIN: -361 J/kg
Mixed-layer LCL: 540 m above ground
0-6 km bulk shear: 48 kt
0-1 km storm-relative helicity: 259 m²/s²
0-3 km storm-relative helicity: 415 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 2.7

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 23, 7:05 PM CDT	Mesoscale Discussion	SPC	Adair, Alfalfa, Atoka, Blaine, Caddo, Canadian and 46 more	25 min
Apr 23, 7:35 PM CDT	Severe Thunderstorm Watch	SPC	Adair, Blaine, Caddo, Canadian, Cherokee, Cleveland and 40 more	6 hr
Apr 23, 7:48 PM CDT	Mesoscale Discussion	SPC	Carter, Cotton, Jefferson, Johnston, Love, Marshall and 3 more	87 min
Apr 23, 9:18 PM CDT	Mesoscale Discussion	SPC	Carter, Coal, Jefferson, Johnston, Love, Marshall and 2 more	57 min
Apr 23, 9:43 PM CDT	Mesoscale Discussion	SPC	Adair, Caddo, Canadian, Cherokee, Cleveland, Coal and 38 more	62 min
Apr 23, 11:08 PM CDT	Mesoscale Discussion	SPC	Carter, Johnston, Love, Marshall, Murray	37 min
Apr 23, 11:33 PM CDT	Mesoscale Discussion	SPC	Adair, Cherokee, Delaware, Haskell, Hughes, Latimer and 12 more	57 min
Apr 24, 1:40 AM CDT	Severe Thunderstorm Watch	SPC	LeFlore, McCurtain, Sequoyah	4 hr

Nearby

Mesoscale Discussions in Oklahoma, 2004 Every mesoscale discussion in 2004

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.