Alert archive / Texas / Mesoscale Discussions in 2007

Mesoscale Discussion 475

April 12, 200744 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at Apr 12, 2007, 11:31 PM CDT for 44 counties in Texas. It was in force for 119 min.

The area

The outline as issued.

The facts

Issued
Apr 12, 2007, 11:31 PM CDT (04:31 UTC)
Expired
Apr 13, 2007, 1:30 AM CDT
In force
119 min
Issued by
the Storm Prediction Center
All 44 counties

Andrews County, TX, Armstrong County, TX, Bailey County, TX, Borden County, TX, Briscoe County, TX, Carson County, TX, Castro County, TX, Childress County, TX, Cochran County, TX, Collingsworth County, TX, Cottle County, TX, Crosby County, TX, Dawson County, TX, Deaf Smith County, TX, Dickens County, TX, Donley County, TX, Fisher County, TX, Floyd County, TX, Gaines County, TX, Garza County, TX, Gray County, TX, Hale County, TX, Hall County, TX, Hockley County, TX, Howard County, TX, Hutchinson County, TX, Kent County, TX, King County, TX, Lamb County, TX, Lubbock County, TX, Lynn County, TX, Martin County, TX, Mitchell County, TX, Moore County, TX, Motley County, TX, Oldham County, TX, Parmer County, TX, Potter County, TX, Randall County, TX, Roberts County, TX, Scurry County, TX, Swisher County, TX, Terry County, TX, Yoakum County, TX

The radar

The Lubbock radar (KLBB), 35 km from the middle of the area, began a volume at 04:32 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

Amarillo Airport, TX (KAMA), launched 00:00Z, 4.5 hours before the alert went out and 141 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, Amarillo Airport, TX at 00:00Z on 2007-04-13Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 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, Amarillo Airport, TX at 00:00Z on 2007-04-13The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 298 square meters per square second.1939587897117136Sfc1 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
1743 m above ground
0-6 km bulk shear
81 kt
0-1 km storm-relative helicity
298 m²/s²
0-3 km storm-relative helicity
584 m²/s²
Significant tornado parameter
0.0
Supercell composite
1.7

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.

IssuedProductOfficeCountiesLasted
Apr 12, 7:37 PM CDTMesoscale DiscussionSPCBaylor, Collingsworth, Foard, Hardeman, Wheeler, Wichita and 1 more113 min
Apr 12, 9:35 PM CDTMesoscale DiscussionSPCArmstrong, Bailey, Briscoe, Carson, Castro, Childress and 35 more115 min
Apr 12, 11:46 PM CDTSevere Thunderstorm WatchSPCAndrews, Armstrong, Bailey, Baylor, Borden, Briscoe and 63 more7 hr
Apr 13, 2:36 AM CDTMesoscale DiscussionSPCArmstrong, Briscoe, Carson, Castro, Childress, Collingsworth and 23 more84 min
Apr 13, 5:34 AM CDTMesoscale DiscussionSPCArcher, Armstrong, Baylor, Briscoe, Callahan, Carson and 32 more86 min
Apr 13, 12:12 PM CDTMesoscale DiscussionSPCArcher, Baylor, Fisher, Haskell, Hood, Jack and 8 more63 min
Apr 13, 12:27 PM CDTTornado WatchSPCArcher, Baylor, Brown, Callahan, Clay, Coke and 27 more7 hr
Apr 13, 12:37 PM CDTMesoscale DiscussionSPCFoard, Hardeman, Wichita, Wilbarger113 min
Apr 13, 2:51 PM CDTMesoscale DiscussionSPCAnderson, Bell, Bosque, Cherokee, Collin, Cooke and 31 more54 min
Apr 13, 5:08 PM CDTMesoscale DiscussionSPCAngelina, Chambers, Cherokee, Hardin, Harris, Harrison and 18 more97 min
Apr 13, 5:43 PM CDTTornado Watch PDSSPCBell, Bosque, Collin, Cooke, Coryell, Dallas and 22 more4 hr
Apr 13, 5:48 PM CDTTornado Watch PDSSPCAnderson, Angelina, Bowie, Brazos, Burleson, Camp and 39 more8 hr
Apr 13, 5:58 PM CDTMesoscale DiscussionSPCBandera, Blanco, Burnet, Edwards, Gillespie, Hays and 16 more62 min
Apr 13, 6:27 PM CDTTornado WatchSPCAtascosa, Bandera, Bastrop, Bexar, Blanco, Burnet and 26 more8 hr

Nearby

Mesoscale Discussions in Texas, 2007Every 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.