Alert archive / Texas / Mesoscale Discussions in 2015

Mesoscale Discussion 444

April 24, 2015Cameron County, Texas

The Storm Prediction Center issued this mesoscale discussion at Apr 24, 2015, 10:55 PM CDT for Cameron County, Texas. It was in force for 65 min.

The area

The outline as issued.

The facts

Issued
Apr 24, 2015, 10:55 PM CDT (03:55 UTC)
Expired
Apr 25, 2015, 12:00 AM CDT
In force
65 min
Issued by
the Storm Prediction Center

County Cameron County, TX

The nearest sounding before it

Brownsville Intl, TX (KBRO), launched 00:00Z, 3.9 hours before the alert went out and 67 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, Brownsville Intl, TX at 00:00Z on 2015-04-25Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 2706 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, Brownsville Intl, TX at 00:00Z on 2015-04-25The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 49 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
2706 J/kg
Mixed-layer CIN
-231 J/kg
Mixed-layer LCL
760 m above ground
0-6 km bulk shear
39 kt
0-1 km storm-relative helicity
49 m²/s²
0-3 km storm-relative helicity
23 m²/s²
Significant tornado parameter
0.0
Supercell composite
1.4

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 24, 7:46 PM CDTMesoscale DiscussionSPCAnderson, Bosque, Bowie, Camp, Cass, Cherokee and 38 more89 min
Apr 24, 9:20 PM CDTMesoscale DiscussionSPCHarrison, Panola55 min
Apr 24, 9:59 PM CDTTornado WatchSPCCherokee, Gregg, Harrison, Marion, Nacogdoches, Panola and 3 more4 hr
Apr 25, 2:48 AM CDTMesoscale DiscussionSPCAtascosa, Bandera, Bexar, Caldwell, Comal, DeWitt and 17 more87 min
Apr 25, 3:09 AM CDTSevere Thunderstorm WatchSPCAtascosa, Austin, Bandera, Bastrop, Bexar, Blanco and 31 more7 hr
Apr 25, 4:31 AM CDTMesoscale DiscussionSPCAtascosa, Austin, Bandera, Bastrop, Bexar, Caldwell and 23 more89 min
Apr 25, 6:52 AM CDTMesoscale DiscussionSPCAtascosa, Brazoria, Chambers, DeWitt, Fort Bend, Frio and 11 more83 min
Apr 25, 7:12 AM CDTSevere Thunderstorm WatchSPCBrazoria, Chambers, Fort Bend, Galveston, Hardin, Harris and 8 more6 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.