Alert archive / Texas / Mesoscale Discussions in 2007

Mesoscale Discussion 547

April 23, 200712 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at Apr 23, 2007, 5:40 PM CDT for 12 counties in Texas. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued: Apr 23, 2007, 5:40 PM CDT (22:40 UTC)
Expired: Apr 23, 2007, 7:45 PM CDT
In force: 2 hr
Issued by: the Storm Prediction Center

Counties Crockett County, TX, Dimmit County, TX, Edwards County, TX, Kerr County, TX, Kimble County, TX, Kinney County, TX, Maverick County, TX, Real County, TX, Sutton County, TX, Uvalde County, TX, Val Verde County, TX, Zavala County, TX

The radar

The Laughlin AFB radar (KDFX), 52 km from the middle of the area, began a volume at 22:39 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 169Apr 23, 7:50 PM CDT

The nearest sounding before it

Midland Regional, TX (KMAF), launched 12:00Z, 10.7 hours before the alert went out and 315 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: 820 J/kg
Mixed-layer CIN: -206 J/kg
Mixed-layer LCL: 1281 m above ground
0-6 km bulk shear: 49 kt
0-1 km storm-relative helicity: 196 m²/s²
0-3 km storm-relative helicity: 198 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 3.7

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, 2:02 PM CDT	Mesoscale Discussion	SPC	Armstrong, Briscoe, Carson, Childress, Collingsworth, Cottle and 15 more	103 min
Apr 23, 3:44 PM CDT	Tornado Watch	SPC	Armstrong, Briscoe, Carson, Childress, Collingsworth, Donley and 14 more	6 hr
Apr 23, 5:19 PM CDT	Mesoscale Discussion	SPC	Borden, Coke, Concho, Cottle, Crosby, Dawson and 31 more	56 min
Apr 23, 5:35 PM CDT	Tornado Watch	SPC	Baylor, Borden, Callahan, Coke, Cottle, Crane and 34 more	5 hr

Nearby

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.