Alert archive / Texas / Mesoscale Discussions in 2020

Mesoscale Discussion 346

April 12, 202030 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at Apr 12, 2020, 4:15 AM CDT for 30 counties in Texas. It was in force for 90 min.

The area

The outline as issued.

The facts

Issued
Apr 12, 2020, 4:15 AM CDT (09:15 UTC)
Expired
Apr 12, 2020, 5:45 AM CDT
In force
90 min
Issued by
the Storm Prediction Center
All 30 counties

Bandera County, TX, Bastrop County, TX, Bell County, TX, Blanco County, TX, Bosque County, TX, Brown County, TX, Burnet County, TX, Comal County, TX, Comanche County, TX, Coryell County, TX, Falls County, TX, Gillespie County, TX, Hamilton County, TX, Hays County, TX, Hill County, TX, Kendall County, TX, Kerr County, TX, Lampasas County, TX, Lee County, TX, Limestone County, TX, Llano County, TX, Mason County, TX, McCulloch County, TX, McLennan County, TX, Milam County, TX, Mills County, TX, Robertson County, TX, San Saba County, TX, Travis County, TX, Williamson County, TX

The radar

The Ft Hood radar (KGRK), 116 km from the middle of the area, began a volume at 09:16 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 00:00Z, 9.3 hours before the alert went out and 241 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 00:00Z on 2020-04-12Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 509 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 00:00Z on 2020-04-12The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 323 square meters per square second.1939587897117Sfc1 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
509 J/kg
Mixed-layer CIN
-124 J/kg
Mixed-layer LCL
678 m above ground
0-6 km bulk shear
47 kt
0-1 km storm-relative helicity
323 m²/s²
0-3 km storm-relative helicity
406 m²/s²
Significant tornado parameter
0.5
Supercell composite
10.7

Open this sounding in Storm Lab

The text

As transmitted.

<!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 11, 7:51 PM CDTMesoscale DiscussionSPCEdwards, Kinney, Real, Sutton, Uvalde, Val Verde84 min
Apr 11, 8:37 PM CDTTornado WatchSPCAtascosa, Bandera, Bastrop, Bexar, Blanco, Caldwell and 23 more5 hr
Apr 11, 9:23 PM CDTMesoscale DiscussionSPCArcher, Baylor, Callahan, Clay, Coke, Coleman and 23 more67 min
Apr 11, 11:03 PM CDTMesoscale DiscussionSPCAtascosa, Bandera, Bexar, Caldwell, Comal, DeWitt and 12 more57 min
Apr 12, 1:37 AM CDTMesoscale DiscussionSPCBandera, Bell, Blanco, Bosque, Brazos, Brown and 44 more113 min
Apr 12, 1:59 AM CDTTornado WatchSPCBandera, Bastrop, Bell, Bexar, Blanco, Bosque and 37 more6 hr
Apr 12, 5:52 AM CDTTornado WatchSPCAnderson, Angelina, Brazos, Burleson, Cherokee, Freestone and 19 more8 hr
Apr 12, 7:18 AM CDTMesoscale DiscussionSPCAnderson, Camp, Cass, Cherokee, Falls, Freestone and 20 more87 min
Apr 12, 9:30 AM CDTMesoscale DiscussionSPCSan Augustine, Shelby90 min
Apr 12, 1:10 PM CDTMesoscale DiscussionSPCCamp, Collin, Cooke, Dallas, Delta, Denton and 17 more95 min
Apr 12, 2:51 PM CDTSevere Thunderstorm WatchSPCBowie, Camp, Cass, Delta, Fannin, Franklin and 11 more5 hr
Apr 12, 6:14 PM CDTMesoscale DiscussionSPCBowie, Camp, Cass, Franklin, Gregg, Harrison and 8 more91 min

Nearby

Mesoscale Discussions in Texas, 2020Every mesoscale discussion in 2020

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.