Alert archive / Texas / Mesoscale Discussions in 2019

Mesoscale Discussion 485

April 30, 201921 counties in Oklahoma; 25 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at Apr 30, 2019, 5:21 PM CDT for 21 counties in Oklahoma; 25 counties in Texas. It was in force for 84 min.

The area

The outline as issued.

The facts

Issued
Apr 30, 2019, 5:21 PM CDT (22:21 UTC)
Expired
Apr 30, 2019, 6:45 PM CDT
In force
84 min
Issued by
the Storm Prediction Center
All 46 counties

Carter County, OK, Cleveland County, OK, Coal County, OK, Cotton County, OK, Creek County, OK, Garvin County, OK, Grady County, OK, Hughes County, OK, Jefferson County, OK, Johnston County, OK, Lincoln County, OK, Love County, OK, Marshall County, OK, McClain County, OK, Murray County, OK, Okfuskee County, OK, Oklahoma County, OK, Pontotoc County, OK, Pottawatomie County, OK, Seminole County, OK, Stephens County, OK, Archer County, TX, Bosque County, TX, Clay County, TX, Collin County, TX, Comanche County, TX, Cooke County, TX, Dallas County, TX, Denton County, TX, Eastland County, TX, Ellis County, TX, Erath County, TX, Grayson County, TX, Hamilton County, TX, Hill County, TX, Hood County, TX, Jack County, TX, Johnson County, TX, Montague County, TX, Palo Pinto County, TX, Parker County, TX, Somervell County, TX, Stephens County, TX, Tarrant County, TX, Wise County, TX, Young County, TX

The radar

The Dallas/Ft Worth radar (KFWS), 127 km from the middle of the area, began a volume at 22:25 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

Fort Worth, TX (KFWD), launched 12:00Z, 10.4 hours before the alert went out and 100 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 12:00Z on 2019-04-30Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1278 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 12:00Z on 2019-04-30The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 237 square meters per square second.193958Sfc1 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
1278 J/kg
Mixed-layer CIN
-54 J/kg
Mixed-layer LCL
701 m above ground
0-6 km bulk shear
34 kt
0-1 km storm-relative helicity
237 m²/s²
0-3 km storm-relative helicity
356 m²/s²
Significant tornado parameter
1.2
Supercell composite
8.5

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
Apr 30, 11:41 AM CDTMesoscale DiscussionSPCAdair, Atoka, Caddo, Canadian, Carter, Cherokee and 41 more2 hr
Apr 30, 12:02 PM CDTTornado WatchSPCAdair, Atoka, Bryan, Caddo, Carter, Cherokee and 45 more13 hr
Apr 30, 2:56 PM CDTMesoscale DiscussionSPCCaddo, Comanche, Grady, Oklahoma, Tillman2 hr
Apr 30, 3:26 PM CDTMesoscale DiscussionSPCAdair, Cherokee, Craig, Delaware, McIntosh, Mayes and 4 more2 hr
Apr 30, 6:00 PM CDTMesoscale DiscussionSPCAdair, Cherokee, Craig, Delaware, LeFlore, Mayes and 5 more90 min
Apr 29, 7:01 PM CDTSevere Thunderstorm WatchSPCAndrews, Borden, Dawson, Ector, Gaines, Howard and 7 more3 hr
Apr 29, 9:35 PM CDTMesoscale DiscussionSPCEctor, Loving, Winkler115 min
Apr 30, 1:53 PM CDTMesoscale DiscussionSPCArcher, Bosque, Brown, Callahan, Clay, Coleman and 28 more2 hr
Apr 30, 2:06 PM CDTMesoscale DiscussionSPCBailey, Borden, Cochran, Crosby, Dawson, Dickens and 17 more2 hr
Apr 30, 2:19 PM CDTTornado WatchSPCArcher, Baylor, Bosque, Clay, Collin, Comanche and 24 more9 hr
Apr 30, 4:26 PM CDTSevere Thunderstorm WatchSPCBorden, Briscoe, Brown, Callahan, Childress, Coke and 44 more8 hr
Apr 30, 6:47 PM CDTMesoscale DiscussionSPCBorden, Coke, Cottle, Crane, Crockett, Crosby and 36 more118 min

Nearby

Mesoscale Discussions in Texas, 2019Mesoscale Discussions in Oklahoma, 2019Every mesoscale discussion in 2019

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.