Alert archive / Texas / Mesoscale Discussions in 2020

Mesoscale Discussion 678

May 22, 202022 counties in Oklahoma; 23 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at May 22, 2020, 9:26 PM CDT for 22 counties in Oklahoma; 23 counties in Texas. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued
May 22, 2020, 9:26 PM CDT (02:26 UTC)
Expired
May 22, 2020, 11:30 PM CDT
In force
2 hr
Issued by
the Storm Prediction Center
Concerning
Severe thunderstorm watch 205
All 45 counties

Atoka County, OK, Bryan County, OK, Caddo County, OK, Carter County, OK, Cleveland County, OK, Coal County, OK, Comanche County, OK, Cotton County, OK, Garvin County, OK, Grady County, OK, Hughes County, OK, Jefferson County, OK, Johnston County, OK, Love County, OK, Marshall County, OK, McClain County, OK, Murray County, OK, Pontotoc County, OK, Pottawatomie County, OK, Seminole County, OK, Stephens County, OK, Tillman County, OK, Archer County, TX, Baylor County, TX, Clay County, TX, Collin County, TX, Cooke County, TX, Denton County, TX, Fannin County, TX, Foard County, TX, Grayson County, TX, Haskell County, TX, Jack County, TX, Jones County, TX, Knox County, TX, Montague County, TX, Palo Pinto County, TX, Parker County, TX, Shackelford County, TX, Stephens County, TX, Throckmorton County, TX, Wichita County, TX, Wilbarger County, TX, Wise County, TX, Young County, TX

The radar

The Norman radar (KTLX), 113 km from the middle of the area, began a volume at 02:26 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

Norman, OK (KOUN), launched 00:00Z, 2.4 hours before the alert went out and 99 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, Norman, OK at 00:00Z on 2020-05-23Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 3106 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, Norman, OK at 00:00Z on 2020-05-23The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 41 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
3106 J/kg
Mixed-layer CIN
-7 J/kg
Mixed-layer LCL
970 m above ground
0-6 km bulk shear
41 kt
0-1 km storm-relative helicity
41 m²/s²
0-3 km storm-relative helicity
128 m²/s²
Significant tornado parameter
1.5
Supercell composite
7.5

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 22, 7:00 PM CDTSevere Thunderstorm WatchSPCAtoka, Bryan, Caddo, Carter, Cleveland, Coal and 16 more8 hr
May 22, 7:17 PM CDTMesoscale DiscussionSPCAdair, Cherokee, Choctaw, Haskell, Latimer, LeFlore and 8 more58 min
May 22, 7:34 PM CDTSevere Thunderstorm WatchSPCChoctaw, Haskell, Latimer, LeFlore, McCurtain, Pittsburg and 2 more8 hr
May 22, 9:14 PM CDTMesoscale DiscussionSPCHaskell, Latimer, LeFlore, Pittsburg, Sequoyah91 min
May 22, 11:56 PM CDTMesoscale DiscussionSPCAtoka, Bryan, Carter, Choctaw, Coal, Comanche and 18 more2 hr
May 23, 2:18 PM CDTMesoscale DiscussionSPCBeaver, Ellis, Harper, Roger Mills117 min
May 23, 3:06 PM CDTSevere Thunderstorm WatchSPCBeaver, Beckham, Ellis, Greer, Harmon, Jackson and 1 more7 hr
May 23, 5:25 PM CDTMesoscale DiscussionSPCBeaver, Beckham, Ellis, Greer, Harmon, Jackson and 1 more2 hr
May 22, 7:16 PM CDTMesoscale DiscussionSPCCoke, Crockett, Fisher, Irion, Jones, Mitchell and 6 more2 hr
May 23, 2:12 PM CDTMesoscale DiscussionSPCBrewster, Coke, Crane, Crockett, Ector, Glasscock and 10 more93 min
May 23, 2:29 PM CDTSevere Thunderstorm WatchSPCBorden, Brewster, Coke, Crane, Crockett, Dawson and 19 more8 hr

Nearby

Mesoscale Discussions in Texas, 2020Mesoscale Discussions in Oklahoma, 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.