Alert archive / Texas / Mesoscale Discussions in 2018

Mesoscale Discussion 184

March 27, 201823 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at Mar 27, 2018, 11:58 PM CDT for 23 counties in Texas. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued: Mar 27, 2018, 11:58 PM CDT (04:58 UTC)
Expired: Mar 28, 2018, 2:00 AM CDT
In force: 2 hr
Issued by: the Storm Prediction Center

All 23 counties

Atascosa County, TX, Bastrop County, TX, Bexar County, TX, Caldwell County, TX, Comal County, TX, DeWitt County, TX, Dimmit County, TX, Fayette County, TX, Frio County, TX, Gonzales County, TX, Guadalupe County, TX, Karnes County, TX, La Salle County, TX, Lavaca County, TX, Lee County, TX, Live Oak County, TX, Maverick County, TX, McMullen County, TX, Medina County, TX, Uvalde County, TX, Webb County, TX, Wilson County, TX, Zavala County, TX

The radar

The Austin/San Antonio radar (KEWX), 88 km from the middle of the area, began a volume at 05:02 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 00:00Z, 5.0 hours before the alert went out and 183 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: 2154 J/kg
Mixed-layer CIN: -37 J/kg
Mixed-layer LCL: 579 m above ground
0-6 km bulk shear: 37 kt
0-1 km storm-relative helicity: 114 m²/s²
0-3 km storm-relative helicity: 62 m²/s²
Significant tornado parameter: 1.1
Supercell composite: 6.4

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
Mar 27, 9:23 PM CDT	Mesoscale Discussion	SPC	Atascosa, Bandera, Bexar, Blanco, Caldwell, Comal and 20 more	97 min
Mar 27, 9:51 PM CDT	Severe Thunderstorm Watch	SPC	Atascosa, Bastrop, Bexar, Caldwell, DeWitt, Dimmit and 15 more	5 hr
Mar 28, 5:05 AM CDT	Mesoscale Discussion	SPC	Bastrop, Brazos, Burleson, Fayette, Grimes, Lee and 1 more	85 min
Mar 28, 9:09 AM CDT	Mesoscale Discussion	SPC	Atascosa, Bexar, Frio, Medina, Wilson	2 hr
Mar 28, 11:38 AM CDT	Mesoscale Discussion	SPC	Austin, Colorado, Fort Bend, Hardin, Harris, Jasper and 10 more	67 min
Mar 28, 12:03 PM CDT	Tornado Watch	SPC	Angelina, Austin, Brazoria, Chambers, Colorado, Fort Bend and 24 more	9 hr
Mar 28, 3:07 PM CDT	Mesoscale Discussion	SPC	Austin, Chambers, Fort Bend, Hardin, Harris, Jasper and 9 more	113 min
Mar 28, 5:48 PM CDT	Mesoscale Discussion	SPC	Austin, Brazoria, Chambers, Colorado, Fort Bend, Hardin and 10 more	87 min
Mar 28, 6:53 PM CDT	Mesoscale Discussion	SPC	Brooks, Cameron, Duval, Hidalgo, Jim Hogg, Jim Wells and 6 more	97 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.