Alert archive / Texas / Mesoscale Discussions in 2009

Mesoscale Discussion 2272

December 23, 200914 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at Dec 23, 2009, 3:00 PM CST for 14 counties in Texas. It was in force for 60 min.

The area

The outline as issued.

The facts

Issued: Dec 23, 2009, 3:00 PM CST (21:00 UTC)
Expired: Dec 23, 2009, 4:00 PM CST
In force: 60 min
Issued by: the Storm Prediction Center

Counties Bosque County, TX, Comanche County, TX, Cooke County, TX, Dallas County, TX, Denton County, TX, Erath County, TX, Hamilton County, TX, Hood County, TX, Johnson County, TX, Palo Pinto County, TX, Parker County, TX, Somervell County, TX, Tarrant County, TX, Wise County, TX

The radar

The Dallas/Ft Worth radar (KFWS), 32 km from the middle of the area, began a volume at 21:03 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, 9.0 hours before the alert went out and 284 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: 781 J/kg
Mixed-layer CIN: -5 J/kg
Mixed-layer LCL: 434 m above ground
0-6 km bulk shear: 58 kt
0-1 km storm-relative helicity: 137 m²/s²
0-3 km storm-relative helicity: 139 m²/s²
Significant tornado parameter: 0.4
Supercell composite: 2.2

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
Dec 23, 2:37 AM CST	Mesoscale Discussion	SPC	Anderson, Angelina, Bowie, Camp, Cass, Chambers and 44 more	2 hr
Dec 23, 12:18 PM CST	Mesoscale Discussion	SPC	Cooke, Fannin, Grayson	57 min
Dec 23, 1:03 PM CST	Mesoscale Discussion	SPC	Anderson, Angelina, Austin, Brazos, Burleson, Camp and 39 more	57 min
Dec 23, 1:59 PM CST	Tornado Watch	SPC	Anderson, Angelina, Austin, Bowie, Brazos, Burleson and 47 more	7 hr
Dec 23, 5:21 PM CST	Mesoscale Discussion	SPC	Anderson, Angelina, Bowie, Camp, Cass, Cherokee and 32 more	114 min

Nearby

Mesoscale Discussions in Texas, 2009 Every mesoscale discussion in 2009

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.