Alert archive / Arkansas / Mesoscale Discussions in 2014

Mesoscale Discussion 216

March 28, 201423 counties in Arkansas; 6 parishes in Louisiana; 4 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at Mar 28, 2014, 12:45 PM CDT for 23 counties in Arkansas; 6 parishes in Louisiana; 4 counties in Texas. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued
Mar 28, 2014, 12:45 PM CDT (17:45 UTC)
Expired
Mar 28, 2014, 2:45 PM CDT
In force
2 hr
Issued by
the Storm Prediction Center
Chance of a watch
60%
All 33 counties

Ashley County, AR, Bradley County, AR, Calhoun County, AR, Chicot County, AR, Clark County, AR, Cleveland County, AR, Columbia County, AR, Dallas County, AR, Drew County, AR, Grant County, AR, Hempstead County, AR, Hot Spring County, AR, Howard County, AR, Jefferson County, AR, Lafayette County, AR, Lincoln County, AR, Little River County, AR, Miller County, AR, Nevada County, AR, Ouachita County, AR, Pike County, AR, Sevier County, AR, Union County, AR, Bossier Parish, LA, Claiborne Parish, LA, Lincoln Parish, LA, Morehouse Parish, LA, Union Parish, LA, Webster Parish, LA, Bowie County, TX, Cass County, TX, Marion County, TX, Morris County, TX

The radar

The Shreveport radar (KSHV), 131 km from the middle of the area, began a volume at 17:45 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

Shreveport, LA (KBAD), launched 12:00Z, 5.8 hours before the alert went out and 124 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, Shreveport, LA at 12:00Z on 2014-03-28Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1548 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, Shreveport, LA at 12:00Z on 2014-03-28The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 158 square meters per square second.193958Sfc1 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
1548 J/kg
Mixed-layer CIN
-40 J/kg
Mixed-layer LCL
564 m above ground
0-6 km bulk shear
44 kt
0-1 km storm-relative helicity
158 m²/s²
0-3 km storm-relative helicity
124 m²/s²
Significant tornado parameter
1.2
Supercell composite
5.9

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

<!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, 7:55 PM CDTMesoscale DiscussionSPCBenton, Boone, Carroll, Crawford, Franklin, Johnson and 4 more2 hr
Mar 27, 9:44 PM CDTSevere Thunderstorm WatchSPCBaxter, Boone, Carroll, Conway, Crawford, Franklin and 18 more4 hr
Mar 28, 2:35 PM CDTSevere Thunderstorm WatchSPCArkansas, Ashley, Bradley, Calhoun, Chicot, Clark and 29 more7 hr
Mar 28, 3:11 PM CDTMesoscale DiscussionSPCMiller94 min
Mar 28, 5:43 PM CDTMesoscale DiscussionSPCChicot, Desha, Phillips2 hr
Mar 28, 6:22 PM CDTSevere Thunderstorm WatchSPCLee, Phillips5 hr
Mar 28, 6:38 PM CDTMesoscale DiscussionSPCAcadia, Allen, Ascension, Assumption, Avoyelles, Beauregard and 35 more3 hr
Mar 28, 6:53 PM CDTMesoscale DiscussionSPCDe Soto, Red River, Sabine2 hr
Mar 28, 12:35 PM CDTMesoscale DiscussionSPCAnderson, Bell, Blanco, Bosque, Brazos, Burleson and 48 more115 min
Mar 28, 12:47 PM CDTSevere Thunderstorm WatchSPCAnderson, Bastrop, Bell, Blanco, Bosque, Burnet and 50 more6 hr
Mar 28, 3:57 PM CDTSevere Thunderstorm WatchSPCBrazos, Burleson, Grimes, Hardin, Houston, Jasper and 10 more6 hr
Mar 28, 5:19 PM CDTSevere Thunderstorm WatchSPCAustin, Brazoria, Chambers, Colorado, Fort Bend, Galveston and 5 more5 hr

Nearby

Mesoscale Discussions in Arkansas, 2014Mesoscale Discussions in Louisiana, 2014Mesoscale Discussions in Texas, 2014Every mesoscale discussion in 2014

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.