Alert archive / Texas / Mesoscale Discussions in 2020

Mesoscale Discussion 1339

July 25, 20205 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at Jul 25, 2020, 7:23 PM CDT for 5 counties in Texas. It was in force for 5 hr.

The area

The outline as issued.

The facts

Issued: Jul 25, 2020, 7:23 PM CDT (00:23 UTC)
Expired: Jul 26, 2020, 12:30 AM CDT
In force: 5 hr
Issued by: the Storm Prediction Center
Concerning: Severe potential...watch possible
Chance of a watch: 40%

Counties Cameron County, TX, Kenedy County, TX, Kleberg County, TX, Nueces County, TX, Willacy County, TX

The radar

The Corpus Christi radar (KCRP), 99 km from the middle of the area, began a volume at 00:23 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.

Tornado Watch 402Jul 25, 11:05 PM CDT

The nearest sounding before it

Corpus Christi, TX (KCRP), launched 00:00Z, 0.4 hours before the alert went out and 93 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: 573 J/kg
Mixed-layer CIN: -1 J/kg
Mixed-layer LCL: 576 m above ground
0-6 km bulk shear: 31 kt
0-1 km storm-relative helicity: 98 m²/s²
0-3 km storm-relative helicity: 94 m²/s²
Significant tornado parameter: 0.2
Supercell composite: 1.7

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.

Issued	Product	Office	Counties	Lasted
Jul 25, 11:05 PM CDT	Tornado Watch	SPC	Brooks, Cameron, Duval, Hidalgo, Jim Wells, Kenedy and 6 more	9 hr
Jul 26, 3:23 AM CDT	Mesoscale Discussion	SPC	Brooks, Cameron, Duval, Hidalgo, Jim Wells, Kenedy and 6 more	2 hr
Jul 26, 6:45 AM CDT	Mesoscale Discussion	SPC	Aransas, Brooks, Cameron, Duval, Hidalgo, Jim Wells and 5 more	90 min
Jul 26, 7:51 AM CDT	Tornado Watch	SPC	Brooks, Cameron, Duval, Hidalgo, Jim Hogg, Jim Wells and 8 more	14 hr
Jul 26, 12:13 PM CDT	Mesoscale Discussion	SPC	Brooks, Cameron, Duval, Hidalgo, Jim Hogg, Jim Wells and 5 more	2 hr

Nearby

Mesoscale Discussions in Texas, 2020 Every 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.