Alert archive / Texas / Mesoscale Discussions in 2009

Mesoscale Discussion 628

April 29, 200939 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at Apr 29, 2009, 12:07 PM CDT for 39 counties in Texas. It was in force for 113 min.

The area

The outline as issued.

The facts

Issued
Apr 29, 2009, 12:07 PM CDT (17:07 UTC)
Expired
Apr 29, 2009, 2:00 PM CDT
In force
113 min
Issued by
the Storm Prediction Center
All 39 counties

Borden County, TX, Bosque County, TX, Callahan County, TX, Coke County, TX, Coleman County, TX, Comanche County, TX, Crosby County, TX, Dallas County, TX, Eastland County, TX, Ellis County, TX, Erath County, TX, Fisher County, TX, Garza County, TX, Glasscock County, TX, Haskell County, TX, Hill County, TX, Hood County, TX, Howard County, TX, Jack County, TX, Johnson County, TX, Jones County, TX, Kent County, TX, Martin County, TX, Mitchell County, TX, Nolan County, TX, Palo Pinto County, TX, Parker County, TX, Runnels County, TX, Scurry County, TX, Shackelford County, TX, Somervell County, TX, Stephens County, TX, Sterling County, TX, Stonewall County, TX, Tarrant County, TX, Taylor County, TX, Throckmorton County, TX, Wise County, TX, Young County, TX

The radar

The Dyess AFB radar (KDYX), 30 km from the middle of the area, began a volume at 17:09 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

Fort Worth, TX (KFWD), launched 12:00Z, 5.1 hours before the alert went out and 217 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-pSkew-T log-p diagram, Fort Worth, TX at 12:00Z on 2009-04-29Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1229 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Fort Worth, TX at 12:00Z on 2009-04-29The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 130 square meters per square second.193958Sfc1 km3 km6 km9 kmRMLM
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
1229 J/kg
Mixed-layer CIN
-4 J/kg
Mixed-layer LCL
462 m above ground
0-6 km bulk shear
42 kt
0-1 km storm-relative helicity
130 m²/s²
0-3 km storm-relative helicity
173 m²/s²
Significant tornado parameter
0.6
Supercell composite
3.4

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.

IssuedProductOfficeCountiesLasted
Apr 28, 7:23 PM CDTMesoscale DiscussionSPCAndrews, Armstrong, Bailey, Borden, Briscoe, Callahan and 61 more3 hr
Apr 28, 7:46 PM CDTMesoscale DiscussionSPCLoving, Pecos, Reeves, Ward, Winkler119 min
Apr 28, 9:25 PM CDTSevere Thunderstorm WatchSPCArmstrong, Bailey, Briscoe, Carson, Castro, Childress and 43 more6 hr
Apr 28, 10:33 PM CDTMesoscale DiscussionSPCAndrews, Armstrong, Bailey, Briscoe, Carson, Castro and 48 more87 min
Apr 28, 10:57 PM CDTSevere Thunderstorm WatchSPCAndrews, Dawson, Ector, Gaines, Loving, Martin and 2 more5 hr
Apr 29, 2:46 AM CDTMesoscale DiscussionSPCArmstrong, Bailey, Briscoe, Carson, Castro, Childress and 27 more89 min
Apr 29, 3:49 AM CDTSevere Thunderstorm WatchSPCArcher, Armstrong, Baylor, Briscoe, Carson, Childress and 19 more7 hr
Apr 29, 6:09 AM CDTMesoscale DiscussionSPCArcher, Baylor, Childress, Clay, Collingsworth, Cottle and 6 more96 min
Apr 29, 9:16 AM CDTMesoscale DiscussionSPCArcher, Baylor, Bowie, Camp, Cass, Clay and 26 more89 min
Apr 29, 9:36 AM CDTSevere Thunderstorm WatchSPCBowie, Camp, Cass, Collin, Cooke, Delta and 14 more6 hr
Apr 29, 12:36 PM CDTTornado WatchSPCArcher, Baylor, Borden, Callahan, Clay, Crosby and 32 more9 hr
Apr 29, 12:58 PM CDTMesoscale DiscussionSPCBowie, Camp, Cass, Collin, Delta, Fannin and 8 more2 hr
Apr 29, 2:03 PM CDTMesoscale DiscussionSPCCoke, Crockett, Glasscock, Irion, Midland, Reagan and 3 more57 min
Apr 29, 2:33 PM CDTTornado WatchSPCCoke, Concho, Crockett, Edwards, Glasscock, Irion and 14 more9 hr
Apr 29, 2:59 PM CDTMesoscale DiscussionSPCArmstrong, Briscoe, Carson, Donley, Floyd, Gray and 7 more91 min
Apr 29, 3:04 PM CDTMesoscale DiscussionSPCBowie, Camp, Cass, Collin, Dallas, Delta and 17 more56 min
Apr 29, 3:27 PM CDTSevere Thunderstorm WatchSPCBowie, Camp, Cass, Collin, Cooke, Dallas and 24 more6 hr
Apr 29, 3:34 PM CDTMesoscale DiscussionSPCArcher, Baylor, Borden, Callahan, Clay, Crosby and 31 more56 min
Apr 29, 3:47 PM CDTTornado WatchSPCArmstrong, Briscoe, Carson, Childress, Collingsworth, Cottle and 18 more7 hr
Apr 29, 5:17 PM CDTMesoscale DiscussionSPCArmstrong, Briscoe, Carson, Childress, Collingsworth, Cottle and 18 more88 min
Apr 29, 5:19 PM CDTMesoscale DiscussionSPCBowie, Camp, Cass, Collin, Cooke, Delta and 21 more116 min
Apr 29, 5:53 PM CDTMesoscale DiscussionSPCBowie, Camp, Cass, Collin, Cooke, Dallas and 20 more67 min
Apr 29, 6:21 PM CDTMesoscale DiscussionSPCArcher, Baylor, Borden, Callahan, Clay, Crosby and 33 more54 min

Nearby

Mesoscale Discussions in Texas, 2009Every 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.