Alert archive / Texas / Mesoscale Discussions in 2018

Mesoscale Discussion 183

March 27, 201826 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at Mar 27, 2018, 9:23 PM CDT for 26 counties in Texas. It was in force for 97 min.

The area

The outline as issued.

The facts

Issued
Mar 27, 2018, 9:23 PM CDT (02:23 UTC)
Expired
Mar 27, 2018, 11:00 PM CDT
In force
97 min
Issued by
the Storm Prediction Center
Chance of a watch
40%
All 26 counties

Atascosa County, TX, Bandera County, TX, Bexar County, TX, Blanco County, TX, Caldwell County, TX, Comal County, TX, Dimmit County, TX, Frio County, TX, Gillespie County, TX, Gonzales County, TX, Guadalupe County, TX, Hays County, TX, Karnes County, TX, Kendall County, TX, Kerr County, TX, Kinney County, TX, La Salle County, TX, Maverick County, TX, McMullen County, TX, Medina County, TX, Real County, TX, Travis County, TX, Uvalde County, TX, Webb County, TX, Wilson County, TX, Zavala County, TX

The radar

The Laughlin AFB radar (KDFX), 117 km from the middle of the area, began a volume at 02:23 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.

The nearest sounding before it

Del Rio, TX (KDLF), launched 00:00Z, 2.4 hours before the alert went out and 173 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-pSkew-T log-p diagram, Del Rio, TX at 00:00Z on 2018-03-28Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 161 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Del Rio, TX at 00:00Z on 2018-03-28The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 67 square meters per square second.1939587897117Sfc1 km3 km6 km9 kmRMLM
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
161 J/kg
Mixed-layer CIN
-119 J/kg
Mixed-layer LCL
821 m above ground
0-6 km bulk shear
52 kt
0-1 km storm-relative helicity
67 m²/s²
0-3 km storm-relative helicity
137 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.

IssuedProductOfficeCountiesLasted
Mar 27, 9:51 PM CDTSevere Thunderstorm WatchSPCAtascosa, Bastrop, Bexar, Caldwell, DeWitt, Dimmit and 15 more5 hr
Mar 27, 11:58 PM CDTMesoscale DiscussionSPCAtascosa, Bastrop, Bexar, Caldwell, Comal, DeWitt and 17 more2 hr
Mar 28, 5:05 AM CDTMesoscale DiscussionSPCBastrop, Brazos, Burleson, Fayette, Grimes, Lee and 1 more85 min
Mar 28, 9:09 AM CDTMesoscale DiscussionSPCAtascosa, Bexar, Frio, Medina, Wilson2 hr
Mar 28, 11:38 AM CDTMesoscale DiscussionSPCAustin, Colorado, Fort Bend, Hardin, Harris, Jasper and 10 more67 min
Mar 28, 12:03 PM CDTTornado WatchSPCAngelina, Austin, Brazoria, Chambers, Colorado, Fort Bend and 24 more9 hr
Mar 28, 3:07 PM CDTMesoscale DiscussionSPCAustin, Chambers, Fort Bend, Hardin, Harris, Jasper and 9 more113 min
Mar 28, 5:48 PM CDTMesoscale DiscussionSPCAustin, Brazoria, Chambers, Colorado, Fort Bend, Hardin and 10 more87 min
Mar 28, 6:53 PM CDTMesoscale DiscussionSPCBrooks, Cameron, Duval, Hidalgo, Jim Hogg, Jim Wells and 6 more97 min

Nearby

Mesoscale Discussions in Texas, 2018Every 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.