Alert archive / Texas / Mesoscale Discussions in 2015

Mesoscale Discussion 415

April 22, 201542 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at Apr 22, 2015, 10:43 AM CDT for 42 counties in Texas. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued
Apr 22, 2015, 10:43 AM CDT (15:43 UTC)
Expired
Apr 22, 2015, 12:45 PM CDT
In force
2 hr
Issued by
the Storm Prediction Center
Chance of a watch
60%
All 42 counties

Aransas County, TX, Atascosa County, TX, Austin County, TX, Bandera County, TX, Bastrop County, TX, Bee County, TX, Bexar County, TX, Brazoria County, TX, Caldwell County, TX, Calhoun County, TX, Colorado County, TX, Comal County, TX, DeWitt County, TX, Dimmit County, TX, Duval County, TX, Fayette County, TX, Fort Bend County, TX, Frio County, TX, Goliad County, TX, Gonzales County, TX, Guadalupe County, TX, Harris County, TX, Jackson County, TX, Jim Wells County, TX, Karnes County, TX, Kendall County, TX, Kleberg County, TX, La Salle County, TX, Lavaca County, TX, Live Oak County, TX, Matagorda County, TX, McMullen County, TX, Medina County, TX, Nueces County, TX, Refugio County, TX, San Patricio County, TX, Victoria County, TX, Waller County, TX, Webb County, TX, Wharton County, TX, Wilson County, TX, Zavala County, TX

The radar

The Corpus Christi radar (KCRP), 108 km from the middle of the area, began a volume at 15:43 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

Corpus Christi, TX (KCRP), launched 12:00Z, 3.7 hours before the alert went out and 110 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, Corpus Christi, TX at 12:00Z on 2015-04-22Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 856 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, Corpus Christi, TX at 12:00Z on 2015-04-22The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 159 square meters per square second.1939587897Sfc1 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
856 J/kg
Mixed-layer CIN
-173 J/kg
Mixed-layer LCL
763 m above ground
0-6 km bulk shear
55 kt
0-1 km storm-relative helicity
159 m²/s²
0-3 km storm-relative helicity
202 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.9

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 22, 2:55 AM CDTMesoscale DiscussionSPCHemphill, Wheeler3 hr
Apr 22, 11:13 AM CDTTornado WatchSPCAransas, Bee, Calhoun, Duval, Goliad, Jim Wells and 7 more7 hr
Apr 22, 12:07 PM CDTMesoscale DiscussionSPCJim Wells, Nueces83 min
Apr 22, 1:43 PM CDTMesoscale DiscussionSPCAtascosa, Austin, Bandera, Bastrop, Bexar, Caldwell and 15 more92 min
Apr 22, 2:07 PM CDTMesoscale DiscussionSPCArcher, Armstrong, Baylor, Briscoe, Castro, Childress and 25 more2 hr
Apr 22, 2:29 PM CDTMesoscale DiscussionSPCAransas, Bee, Calhoun, Duval, Goliad, Jim Wells and 5 more61 min
Apr 22, 2:56 PM CDTTornado WatchSPCArcher, Armstrong, Bailey, Baylor, Briscoe, Callahan and 36 more9 hr
Apr 22, 5:48 PM CDTMesoscale DiscussionSPCBosque, Comanche, Coryell, Ellis, Erath, Hamilton and 8 more117 min
Apr 22, 6:45 PM CDTMesoscale DiscussionSPCArcher, Armstrong, Baylor, Briscoe, Carson, Castro and 29 more2 hr

Nearby

Mesoscale Discussions in Texas, 2015Every mesoscale discussion in 2015

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.