Alert archive / Texas / Mesoscale Discussions in 2017

Mesoscale Discussion 515

April 17, 201710 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at Apr 17, 2017, 4:50 PM CDT for 10 counties in Texas. It was in force for 115 min.

The area

The outline as issued.

The facts

Issued: Apr 17, 2017, 4:50 PM CDT (21:50 UTC)
Expired: Apr 17, 2017, 6:45 PM CDT
In force: 115 min
Issued by: the Storm Prediction Center
Chance of a watch: 5%

Counties Brooks County, TX, Duval County, TX, Jim Hogg County, TX, Jim Wells County, TX, Kenedy County, TX, Kleberg County, TX, Starr County, TX, Webb County, TX, Willacy County, TX, Zapata County, TX

The radar

The Corpus Christi radar (KCRP), 128 km from the middle of the area, began a volume at 21:54 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, 9.8 hours before the alert went out and 140 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 1218 m above ground
0-6 km bulk shear: 12 kt
0-1 km storm-relative helicity: -59 m²/s²
0-3 km storm-relative helicity: -19 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

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
Apr 16, 7:01 PM CDT	Mesoscale Discussion	SPC	Armstrong, Briscoe, Childress, Collingsworth, Cottle, Crosby and 25 more	59 min
Apr 16, 9:06 PM CDT	Mesoscale Discussion	SPC	Coke, Crockett, Dimmit, Edwards, Glasscock, Irion and 9 more	2 hr
Apr 16, 9:33 PM CDT	Mesoscale Discussion	SPC	Armstrong, Briscoe, Childress, Collingsworth, Cottle, Crosby and 26 more	57 min
Apr 17, 2:40 AM CDT	Mesoscale Discussion	SPC	Brooks, Duval, Jim Hogg, Jim Wells, Kenedy, Kleberg and 3 more	3 hr

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.