Alert archive / Arkansas / Mesoscale Discussions in 2015

Mesoscale Discussion 2029

December 23, 20154 states

The Storm Prediction Center issued this mesoscale discussion at Dec 23, 2015, 4:39 AM CST for 4 states. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued
Dec 23, 2015, 4:39 AM CST (10:39 UTC)
Expired
Dec 23, 2015, 6:45 AM CST
In force
2 hr
Issued by
the Storm Prediction Center
All 97 counties

Bradley County, AR, Calhoun County, AR, Clark County, AR, Cleburne County, AR, Cleveland County, AR, Columbia County, AR, Conway County, AR, Dallas County, AR, Drew County, AR, Faulkner County, AR, Franklin County, AR, Garland County, AR, Grant County, AR, Hempstead County, AR, Hot Spring County, AR, Howard County, AR, Jefferson County, AR, Johnson County, AR, Lafayette County, AR, Lincoln County, AR, Little River County, AR, Logan County, AR, Lonoke County, AR, Miller County, AR, Montgomery County, AR, Nevada County, AR, Newton County, AR, Ouachita County, AR, Perry County, AR, Pike County, AR, Polk County, AR, Pope County, AR, Prairie County, AR, Pulaski County, AR, Saline County, AR, Scott County, AR, Searcy County, AR, Sevier County, AR, Stone County, AR, Union County, AR, Van Buren County, AR, White County, AR, Yell County, AR, Bienville Parish, LA, Bossier Parish, LA, Caddo Parish, LA, Claiborne Parish, LA, De Soto Parish, LA, Grant Parish, LA, Jackson Parish, LA, Lincoln Parish, LA, Natchitoches Parish, LA, Ouachita Parish, LA, Red River Parish, LA, Sabine Parish, LA, Union Parish, LA, Vernon Parish, LA, Webster Parish, LA, Winn Parish, LA, McCurtain County, OK, Anderson County, TX, Angelina County, TX, Bowie County, TX, Camp County, TX, Cass County, TX, Cherokee County, TX, Delta County, TX, Ellis County, TX, Franklin County, TX, Freestone County, TX, Gregg County, TX, Harrison County, TX, Henderson County, TX, Hopkins County, TX, Houston County, TX, Hunt County, TX, Kaufman County, TX, Lamar County, TX, Leon County, TX, Marion County, TX, Morris County, TX, Nacogdoches County, TX, Navarro County, TX, Panola County, TX, Rains County, TX, Red River County, TX, Rockwall County, TX, Rusk County, TX, Sabine County, TX, San Augustine County, TX, Shelby County, TX, Smith County, TX, Titus County, TX, Trinity County, TX, Upshur County, TX, Van Zandt County, TX, Wood County, TX

The radar

The Shreveport radar (KSHV), 137 km from the middle of the area, began a volume at 10:39 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 00:00Z, 10.7 hours before the alert went out and 135 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 00:00Z on 2015-12-23Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 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 00:00Z on 2015-12-23The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 105 square meters per square second.1939587897Sfc1 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
948 m above ground
0-6 km bulk shear
44 kt
0-1 km storm-relative helicity
105 m²/s²
0-3 km storm-relative helicity
177 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

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
Dec 22, 10:17 PM CSTMesoscale DiscussionSPCClark, Columbia, Dallas, Garland, Hempstead, Hot Spring and 9 more2 hr
Dec 23, 12:06 AM CSTTornado WatchSPCBradley, Calhoun, Clark, Cleveland, Columbia, Dallas and 10 more7 hr
Dec 23, 6:13 AM CSTMesoscale DiscussionSPCClay, Greene, Randolph2 hr
Dec 23, 6:20 AM CSTTornado WatchSPCArkansas, Baxter, Boone, Bradley, Calhoun, Clark and 50 more7 hr
Dec 23, 9:05 AM CSTMesoscale DiscussionSPCArkansas, Clark, Clay, Cleburne, Cleveland, Craighead and 28 more85 min
Dec 23, 9:13 AM CSTTornado WatchSPCClay, Craighead, Greene, Lawrence, Mississippi, Poinsett and 1 more8 hr
Dec 23, 10:12 AM CSTMesoscale DiscussionSPCBradley, Calhoun, Clark, Cleveland, Columbia, Dallas and 10 more93 min
Dec 23, 10:29 AM CSTMesoscale DiscussionSPCClay91 min
Dec 23, 10:58 AM CSTMesoscale DiscussionSPCArkansas, Ashley, Bradley, Chicot, Cleveland, Crittenden and 11 more2 hr
Dec 23, 11:57 AM CSTTornado Watch PDSSPCArkansas, Ashley, Bradley, Calhoun, Chicot, Cleveland and 12 more9 hr
Dec 23, 12:48 PM CSTMesoscale DiscussionSPCArkansas, Ashley, Bradley, Calhoun, Chicot, Cleveland and 16 more57 min
Dec 23, 2:49 PM CSTMesoscale DiscussionSPCChicot, Crittenden, Cross, Desha, Lee, Mississippi and 2 more86 min
Dec 22, 11:20 PM CSTMesoscale DiscussionSPCJefferson, Lafourche, Plaquemines, St. Mary, Terrebonne115 min
Dec 23, 2:34 AM CSTMesoscale DiscussionSPCAcadia, Allen, Ascension, Assumption, Avoyelles, Caldwell and 38 more86 min
Dec 23, 1:33 PM CSTMesoscale DiscussionSPCEast Baton Rouge, East Feliciana, Saint Helena, Washington57 min

Nearby

Mesoscale Discussions in Arkansas, 2015Mesoscale Discussions in Texas, 2015Mesoscale Discussions in Louisiana, 2015Every mesoscale discussion in 2015

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.