Alert archive / Texas / Mesoscale Discussions in 2018

Mesoscale Discussion 354

May 4, 201814 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at May 4, 2018, 4:41 PM CDT for 14 counties in Texas. It was in force for 94 min.

The area

The outline as issued.

The facts

Issued: May 4, 2018, 4:41 PM CDT (21:41 UTC)
Expired: May 4, 2018, 6:15 PM CDT
In force: 94 min
Issued by: the Storm Prediction Center
Chance of a watch: 5%

Counties Brooks County, TX, Cameron County, TX, Duval County, TX, Hidalgo County, TX, Jim Hogg County, TX, Jim Wells County, TX, Kenedy County, TX, Kleberg County, TX, Live Oak County, TX, Nueces County, TX, Starr County, TX, Webb County, TX, Willacy County, TX, Zapata County, TX

The radar

The Corpus Christi radar (KCRP), 123 km from the middle of the area, began a volume at 21:40 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 nearest sounding before it

Corpus Christi, TX (KCRP), launched 12:00Z, 9.7 hours before the alert went out and 131 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 1166 J/kg
Mixed-layer CIN: -64 J/kg
Mixed-layer LCL: 538 m above ground
0-6 km bulk shear: 20 kt
0-1 km storm-relative helicity: 85 m²/s²
0-3 km storm-relative helicity: 102 m²/s²
Significant tornado parameter: 0.5
Supercell composite: 5.4

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.

Issued	Product	Office	Counties	Lasted
May 3, 9:05 PM CDT	Mesoscale Discussion	SPC	Atascosa, Bandera, Bexar, Blanco, Burnet, Caldwell and 24 more	85 min
May 3, 9:33 PM CDT	Severe Thunderstorm Watch	SPC	Atascosa, Bandera, Bexar, Blanco, Burnet, Comal and 21 more	9 hr
May 3, 11:53 PM CDT	Mesoscale Discussion	SPC	Atascosa, Bandera, Bexar, Blanco, Burnet, Comal and 21 more	2 hr
May 4, 4:13 AM CDT	Mesoscale Discussion	SPC	Edwards, Kinney, Sutton, Val Verde	92 min
May 4, 7:52 AM CDT	Mesoscale Discussion	SPC	Atascosa, Bandera, Bee, Bexar, Blanco, Caldwell and 21 more	113 min

Nearby

Mesoscale Discussions in Texas, 2018 Every mesoscale discussion in 2018

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.