Alert archive / Texas / Mesoscale Discussions in 2017

Mesoscale Discussion 746

May 17, 201710 counties in Kansas; 26 counties in Oklahoma; 30 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at May 17, 2017, 1:49 AM CDT for 10 counties in Kansas; 26 counties in Oklahoma; 30 counties in Texas. It was in force for 56 min.

The area

The outline as issued.

The facts

Issued
May 17, 2017, 1:49 AM CDT (06:49 UTC)
Expired
May 17, 2017, 2:45 AM CDT
In force
56 min
Issued by
the Storm Prediction Center
All 66 counties

Butler County, KS, Chase County, KS, Chautauqua County, KS, Cowley County, KS, Elk County, KS, Geary County, KS, Greenwood County, KS, Lyon County, KS, Morris County, KS, Wabaunsee County, KS, Carter County, OK, Cleveland County, OK, Coal County, OK, Creek County, OK, Garfield County, OK, Garvin County, OK, Grant County, OK, Hughes County, OK, Jefferson County, OK, Johnston County, OK, Kay County, OK, Lincoln County, OK, Love County, OK, Marshall County, OK, McClain County, OK, Murray County, OK, Noble County, OK, Okfuskee County, OK, Osage County, OK, Pawnee County, OK, Payne County, OK, Pontotoc County, OK, Pottawatomie County, OK, Seminole County, OK, Stephens County, OK, Washington County, OK, Archer County, TX, Brown County, TX, Clay County, TX, Coleman County, TX, Collin County, TX, Comanche County, TX, Concho County, TX, Cooke County, TX, Dallas County, TX, Denton County, TX, Eastland County, TX, Erath County, TX, Grayson County, TX, Hamilton County, TX, Hood County, TX, Jack County, TX, Johnson County, TX, McCulloch County, TX, Menard County, TX, Mills County, TX, Montague County, TX, Palo Pinto County, TX, Parker County, TX, San Saba County, TX, Schleicher County, TX, Somervell County, TX, Stephens County, TX, Tarrant County, TX, Wise County, TX, Young County, TX

The radar

The Altus AFB radar (KFDR), 72 km from the middle of the area, began a volume at 06:50 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, 6.8 hours before the alert went out and 117 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 2017-05-17Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 768 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 2017-05-17The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 232 square meters per square second.1939587897Sfc1 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
768 J/kg
Mixed-layer CIN
-307 J/kg
Mixed-layer LCL
953 m above ground
0-6 km bulk shear
53 kt
0-1 km storm-relative helicity
232 m²/s²
0-3 km storm-relative helicity
308 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.5

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 16, 7:03 PM CDTSevere Thunderstorm WatchSPCCheyenne, Decatur, Rawlins5 hr
May 16, 7:31 PM CDTMesoscale DiscussionSPCBrown, Clay, Cloud, Dickinson, Ellis, Ellsworth and 24 more59 min
May 16, 9:43 PM CDTMesoscale DiscussionSPCBrown, Cheyenne, Clay, Cloud, Decatur, Dickinson and 26 more62 min
May 16, 9:53 PM CDTMesoscale DiscussionSPCCowley, Harper, Sumner37 min
May 16, 10:07 PM CDTSevere Thunderstorm WatchSPCBarber, Cowley, Harper, Sumner6 hr
May 16, 10:45 PM CDTSevere Thunderstorm WatchSPCBarton, Butler, Chase, Comanche, Dickinson, Edwards and 17 more5 hr
May 17, 11:39 AM CDTMesoscale DiscussionSPCAtchison, Brown, Doniphan, Nemaha66 min
May 17, 12:08 PM CDTTornado WatchSPCAtchison, Brown, Cloud, Doniphan, Douglas, Jackson and 10 more7 hr
May 17, 2:25 PM CDTMesoscale DiscussionSPCAtchison, Brown, Doniphan, Geary, Jackson, Jefferson and 7 more65 min
May 16, 7:29 PM CDTMesoscale DiscussionSPCAlfalfa, Blaine, Caddo, Canadian, Comanche, Custer and 9 more61 min
May 16, 7:29 PM CDTSevere Thunderstorm WatchSPCBorden, Brown, Callahan, Coke, Coleman, Concho and 35 more8 hr

Nearby

Mesoscale Discussions in Texas, 2017Mesoscale Discussions in Oklahoma, 2017Mesoscale Discussions in Kansas, 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.