Alert archive / Texas / Mesoscale Discussions in 2017

Mesoscale Discussion 909

May 28, 20177 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at May 28, 2017, 7:19 PM CDT for 7 counties in Texas. It was in force for 56 min.

The area

The outline as issued.

The facts

Issued: May 28, 2017, 7:19 PM CDT (00:19 UTC)
Expired: May 28, 2017, 8:15 PM CDT
In force: 56 min
Issued by: the Storm Prediction Center
Chance of a watch: 60%

Counties Duval County, TX, Jim Hogg County, TX, La Salle County, TX, Live Oak County, TX, McMullen County, TX, Webb County, TX, Zapata County, TX

The radar

The Corpus Christi radar (KCRP), 175 km from the middle of the area, began a volume at 00:05 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.

Severe Thunderstorm Watch 297May 28, 7:40 PM CDT

The nearest sounding before it

Corpus Christi, TX (KCRP), launched 00:00Z, 0.3 hours before the alert went out and 191 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: 2745 J/kg
Mixed-layer CIN: -174 J/kg
Mixed-layer LCL: 1028 m above ground
0-6 km bulk shear: 24 kt
0-1 km storm-relative helicity: 28 m²/s²
0-3 km storm-relative helicity: 63 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 1.0

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 28, 7:08 PM CDT	Severe Thunderstorm Watch	SPC	Hardin, Jasper, Newton, Orange, Tyler	6 hr
May 28, 7:34 PM CDT	Mesoscale Discussion	SPC	Cherokee, Gregg, Harrison, Houston, Nacogdoches, Panola and 5 more	56 min
May 28, 7:40 PM CDT	Severe Thunderstorm Watch	SPC	Brooks, Cameron, Duval, Hidalgo, Jim Hogg, Jim Wells and 10 more	8 hr
May 28, 9:16 PM CDT	Mesoscale Discussion	SPC	Hardin, Jasper, Newton, Orange, Sabine, Tyler	59 min
May 28, 9:41 PM CDT	Mesoscale Discussion	SPC	Brooks, Duval, Jim Hogg, Jim Wells, La Salle, Live Oak and 3 more	64 min
May 29, 2:02 AM CDT	Mesoscale Discussion	SPC	Aransas, Brooks, Cameron, Duval, Hidalgo, Jim Wells and 6 more	118 min

Nearby

Mesoscale Discussions in Texas, 2017 Every mesoscale discussion in 2017

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.