Alert archive / Texas / Mesoscale Discussions in 2020

Mesoscale Discussion 674

May 22, 2020Cotton County, Jefferson County, Love County, Oklahoma; 4 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at May 22, 2020, 6:20 PM CDT for Cotton County, Jefferson County, Love County, Oklahoma; 4 counties in Texas. It was in force for 115 min.

The area

The outline as issued.

The facts

Issued: May 22, 2020, 6:20 PM CDT (23:20 UTC)
Expired: May 22, 2020, 8:15 PM CDT
In force: 115 min
Issued by: the Storm Prediction Center
Concerning: Severe thunderstorm watch 203

Counties Cotton County, OK, Jefferson County, OK, Love County, OK, Clay County, TX, Cooke County, TX, Montague County, TX, Wichita County, TX

The radar

The Altus AFB radar (KFDR), 108 km from the middle of the area, began a volume at 23:21 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.

Severe Thunderstorm Watch 205May 22, 6:55 PM CDT

The nearest sounding before it

Fort Worth, TX (KFWD), launched 12:00Z, 11.3 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 580 J/kg
Mixed-layer CIN: -430 J/kg
Mixed-layer LCL: 1997 m above ground
0-6 km bulk shear: 18 kt
0-1 km storm-relative helicity: 30 m²/s²
0-3 km storm-relative helicity: 59 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

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.

Issued	Product	Office	Counties	Lasted
May 21, 9:10 PM CDT	Mesoscale Discussion	SPC	Alfalfa, Beaver, Ellis, Harper, Texas, Woods and 1 more	65 min
May 21, 9:49 PM CDT	Severe Thunderstorm Watch	SPC	Alfalfa, Beaver, Blaine, Canadian, Dewey, Ellis and 14 more	8 hr
May 21, 11:28 PM CDT	Mesoscale Discussion	SPC	Alfalfa, Beaver, Harper, Woods, Woodward	2 hr
May 22, 3:51 AM CDT	Mesoscale Discussion	SPC	Blaine, Canadian, Custer, Dewey, Garfield, Grant and 8 more	84 min
May 22, 5:01 AM CDT	Severe Thunderstorm Watch	SPC	Adair, Atoka, Cherokee, Cleveland, Coal, Creek and 21 more	6 hr
May 22, 9:15 AM CDT	Mesoscale Discussion	SPC	LeFlore	90 min
May 22, 1:27 PM CDT	Severe Thunderstorm Watch	SPC	Carter, Comanche, Cotton, Garvin, Jefferson, Love and 3 more	6 hr
May 22, 4:55 PM CDT	Mesoscale Discussion	SPC	Atoka, Bryan, Carter, Choctaw, Coal, Comanche and 17 more	2 hr
May 21, 8:00 PM CDT	Mesoscale Discussion	SPC	Coke, Concho, Fisher, Haskell, Irion, Jones and 9 more	90 min
May 21, 10:25 PM CDT	Mesoscale Discussion	SPC	Brown, Callahan, Coleman, Concho, McCulloch, Runnels and 2 more	95 min
May 22, 12:55 PM CDT	Mesoscale Discussion	SPC	Archer, Baylor, Foard, Haskell, Jack, Jones and 9 more	95 min

Nearby

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