Alert archive / Texas / Mesoscale Discussions in 2020

Mesoscale Discussion 556

May 8, 20204 counties in Arkansas; 16 counties in Oklahoma; 23 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at May 8, 2020, 2:30 AM CDT for 4 counties in Arkansas; 16 counties in Oklahoma; 23 counties in Texas. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued
May 8, 2020, 2:30 AM CDT (07:30 UTC)
Expired
May 8, 2020, 4:30 AM CDT
In force
2 hr
Issued by
the Storm Prediction Center
All 43 counties

Lafayette County, AR, Little River County, AR, Miller County, AR, Sevier County, AR, Atoka County, OK, Bryan County, OK, Carter County, OK, Choctaw County, OK, Coal County, OK, Cotton County, OK, Hughes County, OK, Jefferson County, OK, Johnston County, OK, Love County, OK, Marshall County, OK, McCurtain County, OK, Murray County, OK, Pontotoc County, OK, Pushmataha County, OK, Stephens County, OK, Bowie County, TX, Camp County, TX, Cass County, TX, Clay County, TX, Collin County, TX, Cooke County, TX, Delta County, TX, Denton County, TX, Fannin County, TX, Franklin County, TX, Grayson County, TX, Hopkins County, TX, Hunt County, TX, Lamar County, TX, Marion County, TX, Montague County, TX, Morris County, TX, Rains County, TX, Red River County, TX, Rockwall County, TX, Titus County, TX, Upshur County, TX, Wood County, TX

The radar

The Dallas/Ft Worth radar (KFWS), 165 km from the middle of the area, began a volume at 07:32 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

Fort Worth, TX (KFWD), launched 00:00Z, 7.5 hours before the alert went out and 140 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, Fort Worth, TX at 00:00Z on 2020-05-08Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 106 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, Fort Worth, TX at 00:00Z on 2020-05-08The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 354 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
106 J/kg
Mixed-layer CIN
-438 J/kg
Mixed-layer LCL
1863 m above ground
0-6 km bulk shear
67 kt
0-1 km storm-relative helicity
354 m²/s²
0-3 km storm-relative helicity
775 m²/s²
Significant tornado parameter
0.0
Supercell composite
1.1

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
May 8, 3:06 AM CDTSevere Thunderstorm WatchSPCBradley, Calhoun, Clark, Cleveland, Columbia, Dallas and 15 more7 hr
May 8, 5:22 AM CDTMesoscale DiscussionSPCBradley, Calhoun, Cleveland, Columbia, Dallas, Ouachita and 1 more83 min
May 7, 7:40 PM CDTSevere Thunderstorm WatchSPCAlfalfa, Beaver, Blaine, Caddo, Canadian, Cleveland and 21 more7 hr
May 7, 9:24 PM CDTMesoscale DiscussionSPCBeaver, Ellis, Harper, Woodward96 min
May 7, 11:12 PM CDTMesoscale DiscussionSPCBeckham, Blaine, Caddo, Canadian, Cleveland, Coal and 36 more2 hr
May 7, 11:25 PM CDTSevere Thunderstorm WatchSPCAtoka, Beckham, Bryan, Carter, Choctaw, Coal and 24 more5 hr
May 8, 1:22 AM CDTMesoscale DiscussionSPCAtoka, Bryan, Carter, Choctaw, Cleveland, Coal and 18 more113 min
May 7, 8:05 PM CDTMesoscale DiscussionSPCArcher, Jack, Palo Pinto, Young85 min
May 7, 8:27 PM CDTSevere Thunderstorm WatchSPCEllis, Jack, Johnson, Palo Pinto, Parker, Tarrant and 2 more4 hr
May 7, 9:53 PM CDTMesoscale DiscussionSPCJack, Johnson, Parker, Tarrant, Wise67 min
May 8, 9:30 AM CDTMesoscale DiscussionSPCAngelina, Jasper, Nacogdoches, Newton, Sabine, San Augustine and 1 more2 hr
May 8, 1:36 PM CDTSevere Thunderstorm WatchSPCNewton, Orange6 hr

Nearby

Mesoscale Discussions in Texas, 2020Mesoscale Discussions in Oklahoma, 2020Mesoscale Discussions in Arkansas, 2020Every mesoscale discussion in 2020

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.