Alert archive / Arkansas / Mesoscale Discussions in 2015

Mesoscale Discussion 557

May 8, 201514 counties in Arkansas; 10 counties in Oklahoma; 11 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at May 8, 2015, 10:43 PM CDT for 14 counties in Arkansas; 10 counties in Oklahoma; 11 counties in Texas. It was in force for 92 min.

The area

The outline as issued.

The facts

Issued
May 8, 2015, 10:43 PM CDT (03:43 UTC)
Expired
May 9, 2015, 12:15 AM CDT
In force
92 min
Issued by
the Storm Prediction Center
All 35 counties

Clark County, AR, Garland County, AR, Hempstead County, AR, Howard County, AR, Lafayette County, AR, Little River County, AR, Miller County, AR, Montgomery County, AR, Nevada County, AR, Pike County, AR, Polk County, AR, Scott County, AR, Sebastian County, AR, Sevier County, AR, Atoka County, OK, Bryan County, OK, Choctaw County, OK, Coal County, OK, Haskell County, OK, Latimer County, OK, LeFlore County, OK, McCurtain County, OK, Pittsburg County, OK, Pushmataha County, OK, Bowie County, TX, Delta County, TX, Fannin County, TX, Franklin County, TX, Grayson County, TX, Hopkins County, TX, Hunt County, TX, Lamar County, TX, Morris County, TX, Red River County, TX, Titus County, TX

The radar

The Western Arkansas radar (KSRX), 134 km from the middle of the area, began a volume at 03:42 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

Shreveport, LA (KBAD), launched 00:00Z, 3.7 hours before the alert went out and 213 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 2015-05-09Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1846 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 00:00Z on 2015-05-09The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 3 square meters per square second.19395878Sfc1 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
1846 J/kg
Mixed-layer CIN
-9 J/kg
Mixed-layer LCL
1150 m above ground
0-6 km bulk shear
25 kt
0-1 km storm-relative helicity
3 m²/s²
0-3 km storm-relative helicity
1 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.5

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
May 9, 9:41 AM CDTMesoscale DiscussionSPCHoward, Little River, Polk, Sevier2 hr
May 9, 1:58 PM CDTMesoscale DiscussionSPCClark, Conway, Faulkner, Franklin, Garland, Hempstead and 20 more92 min
May 9, 2:40 PM CDTTornado WatchSPCBradley, Calhoun, Clark, Cleveland, Columbia, Dallas and 13 more7 hr
May 9, 5:06 PM CDTMesoscale DiscussionSPCArkansas, Bradley, Calhoun, Clark, Cleveland, Columbia and 18 more54 min
May 9, 5:52 PM CDTMesoscale DiscussionSPCClark, Columbia, Hempstead, Lafayette, Little River, Miller and 2 more83 min
May 8, 7:27 PM CDTTornado WatchSPCAtoka, Bryan, Carter, Choctaw, Coal, Creek and 18 more6 hr
May 9, 3:11 AM CDTSevere Thunderstorm WatchSPCBeaver, Cimarron, Texas8 hr
May 9, 4:03 AM CDTMesoscale DiscussionSPCComanche, Cotton, Greer, Harmon, Jackson, Kiowa and 1 more57 min
May 9, 5:51 AM CDTMesoscale DiscussionSPCBeaver, Beckham, Blaine, Cimarron, Comanche, Custer and 14 more84 min
May 9, 7:36 AM CDTSevere Thunderstorm WatchSPCAlfalfa, Beckham, Blaine, Caddo, Canadian, Cleveland and 22 more6 hr
May 9, 11:36 AM CDTMesoscale DiscussionSPCAlfalfa, Blaine, Caddo, Comanche, Cotton, Greer and 7 more84 min
May 9, 1:21 PM CDTTornado WatchSPCAtoka, Bryan, Caddo, Canadian, Carter, Cleveland and 23 more10 hr
May 9, 3:32 PM CDTMesoscale DiscussionSPCBryan, Carter, Coal, Cotton, Garvin, Hughes and 10 more118 min
May 9, 4:52 PM CDTMesoscale DiscussionSPCBeckham, Greer, Harmon, Roger Mills83 min
May 8, 8:42 PM CDTMesoscale DiscussionSPCAndrews, Borden, Callahan, Coke, Coleman, Concho and 28 more2 hr
May 8, 10:48 PM CDTMesoscale DiscussionSPCAndrews, Borden, Callahan, Coke, Crane, Crockett and 26 more87 min
May 9, 2:34 AM CDTMesoscale DiscussionSPCAndrews, Bailey, Castro, Cochran, Dallam, Dawson and 14 more116 min
May 9, 6:21 PM CDTMesoscale DiscussionSPCBrown, Coleman, Comanche, Eastland, Erath, Hood and 6 more84 min

Nearby

Mesoscale Discussions in Arkansas, 2015Mesoscale Discussions in Texas, 2015Mesoscale Discussions in Oklahoma, 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.