Alert archive / Texas / Mesoscale Discussions in 2017

Mesoscale Discussion 790

May 19, 20177 counties in Arkansas; 30 counties in Oklahoma; 34 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at May 19, 2017, 6:56 PM CDT for 7 counties in Arkansas; 30 counties in Oklahoma; 34 counties in Texas. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued
May 19, 2017, 6:56 PM CDT (23:56 UTC)
Expired
May 19, 2017, 9:00 PM CDT
In force
2 hr
Issued by
the Storm Prediction Center
All 71 counties

Benton County, AR, Carroll County, AR, Crawford County, AR, Franklin County, AR, Madison County, AR, Sebastian County, AR, Washington County, AR, Adair County, OK, Atoka County, OK, Bryan County, OK, Carter County, OK, Cherokee County, OK, Choctaw County, OK, Coal County, OK, Cotton County, OK, Delaware County, OK, Garvin County, OK, Haskell County, OK, Hughes County, OK, Jefferson County, OK, Johnston County, OK, Latimer County, OK, LeFlore County, OK, Love County, OK, Marshall County, OK, McIntosh County, OK, Murray County, OK, Muskogee County, OK, Okfuskee County, OK, Okmulgee County, OK, Pittsburg County, OK, Pontotoc County, OK, Pushmataha County, OK, Seminole County, OK, Sequoyah County, OK, Stephens County, OK, Wagoner County, OK, Archer County, TX, Bosque County, TX, Brown County, TX, Clay County, TX, Collin County, TX, Comanche County, TX, Cooke County, TX, Dallas County, TX, Delta County, TX, Denton County, TX, Eastland County, TX, Ellis County, TX, Erath County, TX, Fannin County, TX, Grayson County, TX, Hamilton County, TX, Hill County, TX, Hood County, TX, Hunt County, TX, Jack County, TX, Johnson County, TX, Kaufman County, TX, Lamar County, TX, Mills County, TX, Montague County, TX, Palo Pinto County, TX, Parker County, TX, Rockwall County, TX, Somervell County, TX, Stephens County, TX, Tarrant County, TX, Wichita County, TX, Wise County, TX, Young County, TX

The radar

The Dallas/Ft Worth radar (KFWS), 123 km from the middle of the area, began a volume at 23:58 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 12:00Z, 11.9 hours before the alert went out and 95 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 2017-05-19Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1189 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 2017-05-19The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 93 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
1189 J/kg
Mixed-layer CIN
-285 J/kg
Mixed-layer LCL
756 m above ground
0-6 km bulk shear
25 kt
0-1 km storm-relative helicity
93 m²/s²
0-3 km storm-relative helicity
75 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.1

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 18, 9:41 PM CDTMesoscale DiscussionSPCBenton, Carroll, Crawford, Franklin, Logan, Madison and 3 more94 min
May 18, 10:58 PM CDTTornado WatchSPCBaxter, Benton, Boone, Carroll, Cleburne, Conway and 21 more6 hr
May 18, 11:48 PM CDTMesoscale DiscussionSPCBenton, Boone, Carroll, Crawford, Madison, Washington57 min
May 19, 2:13 PM CDTMesoscale DiscussionSPCBaxter, Benton, Boone, Carroll, Crawford, Franklin and 9 more92 min
May 19, 3:26 PM CDTTornado WatchSPCBenton, Carroll, Crawford, Franklin, Madison, Sebastian and 1 more11 hr
May 19, 5:03 PM CDTMesoscale DiscussionSPCArkansas, Clay, Cleburne, Craighead, Crittenden, Cross and 18 more117 min
May 18, 7:19 PM CDTMesoscale DiscussionSPCAlfalfa, Garfield, Grant, Major, Woods26 min
May 18, 7:43 PM CDTMesoscale DiscussionSPCCarter, Jefferson, Johnston, Love, Murray, Pontotoc62 min
May 18, 7:47 PM CDTSevere Thunderstorm WatchSPCAlfalfa, Atoka, Bryan, Canadian, Carter, Cleveland and 26 more6 hr
May 19, 10:41 AM CDTMesoscale DiscussionSPCCarter, Jefferson, Love, Marshall94 min
May 19, 3:28 PM CDTMesoscale DiscussionSPCGrant, Kay92 min
May 19, 4:47 PM CDTTornado WatchSPCAlfalfa, Grant, Kay4 hr
May 18, 9:08 PM CDTMesoscale DiscussionSPCBrown, Clay, Comanche, Cooke, Denton, Eastland and 10 more37 min
May 19, 2:17 AM CDTMesoscale DiscussionSPCCallahan, Coke, Crane, Ector, Fisher, Glasscock and 9 more118 min
May 19, 2:44 AM CDTSevere Thunderstorm WatchSPCCallahan, Coke, Fisher, Glasscock, Haskell, Howard and 13 more6 hr
May 19, 7:03 AM CDTMesoscale DiscussionSPCCallahan, Collin, Dallas, Denton, Eastland, Ellis and 15 more117 min
May 19, 12:26 PM CDTTornado WatchSPCBrown, Callahan, Coke, Coleman, Comanche, Concho and 19 more7 hr
May 19, 2:45 PM CDTMesoscale DiscussionSPCCallahan, Coke, Coleman, Concho, Fisher, Irion and 10 more60 min
May 19, 5:50 PM CDTMesoscale DiscussionSPCBrown, Callahan, Coke, Coleman, Concho, Eastland and 11 more115 min

Nearby

Mesoscale Discussions in Texas, 2017Mesoscale Discussions in Oklahoma, 2017Mesoscale Discussions in Arkansas, 2017Every mesoscale discussion in 2017

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.