Alert archive / Oklahoma / Mesoscale Discussions in 2007

Mesoscale Discussion 757

May 8, 200718 counties in Oklahoma; 4 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at May 8, 2007, 7:30 PM CDT for 18 counties in Oklahoma; 4 counties in Texas. It was in force for 60 min.

The area

The outline as issued.

The facts

Issued: May 8, 2007, 7:30 PM CDT (00:30 UTC)
Expired: May 8, 2007, 8:30 PM CDT
In force: 60 min
Issued by: the Storm Prediction Center

All 22 counties

Atoka County, OK, Bryan County, OK, Canadian County, OK, Carter County, OK, Cleveland County, OK, Coal County, OK, Garvin County, OK, Grady County, OK, Johnston County, OK, Lincoln County, OK, Love County, OK, Marshall County, OK, McClain County, OK, Murray County, OK, Oklahoma County, OK, Pontotoc County, OK, Pottawatomie County, OK, Seminole County, OK, Cooke County, TX, Denton County, TX, Fannin County, TX, Grayson County, TX

The radar

The Norman radar (KTLX), 126 km from the middle of the area, began a volume at 00:30 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.

Tornado Watch 261May 8, 7:55 PM CDT

The nearest sounding before it

Norman, OK (KOUN), launched 00:00Z, 0.5 hours before the alert went out and 117 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: 763 J/kg
Mixed-layer CIN: -23 J/kg
Mixed-layer LCL: 784 m above ground
0-6 km bulk shear: 21 kt
0-1 km storm-relative helicity: 49 m²/s²
0-3 km storm-relative helicity: 116 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 1.1

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
May 8, 7:54 PM CDT	Tornado Watch	SPC	Atoka, Bryan, Canadian, Carter, Choctaw, Cleveland and 23 more	4 hr
May 8, 10:08 PM CDT	Mesoscale Discussion	SPC	Canadian, Cleveland, Garvin, McClain, Murray, Oklahoma	67 min
May 9, 1:04 AM CDT	Mesoscale Discussion	SPC	Logan, Noble	86 min
May 9, 4:00 PM CDT	Mesoscale Discussion	SPC	Craig, Nowata, Ottawa	2 hr
May 9, 7:47 AM CDT	Mesoscale Discussion	SPC	Brewster, Crane, Crockett, Culberson, Ector, Edwards and 18 more	118 min
May 9, 3:14 PM CDT	Mesoscale Discussion	SPC	Atascosa, Bandera, Bexar, Dimmit, Edwards, Frio and 15 more	61 min
May 9, 3:32 PM CDT	Tornado Watch	SPC	Atascosa, Bandera, Crockett, Dimmit, Duval, Edwards and 16 more	7 hr
May 9, 5:53 PM CDT	Mesoscale Discussion	SPC	Atascosa, Bandera, Burnet, Concho, Dimmit, Edwards and 21 more	97 min

Nearby

Mesoscale Discussions in Oklahoma, 2007 Mesoscale Discussions in Texas, 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.