Alert archive / Oklahoma / Mesoscale Discussions in 2009

Mesoscale Discussion 592

April 26, 200922 counties in Kansas; 44 counties in Oklahoma; 20 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at Apr 26, 2009, 8:42 PM CDT for 22 counties in Kansas; 44 counties in Oklahoma; 20 counties in Texas. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued
Apr 26, 2009, 8:42 PM CDT (01:42 UTC)
Expired
Apr 26, 2009, 10:45 PM CDT
In force
2 hr
Issued by
the Storm Prediction Center
All 86 counties

Allen County, KS, Barber County, KS, Butler County, KS, Chase County, KS, Chautauqua County, KS, Comanche County, KS, Cowley County, KS, Elk County, KS, Greenwood County, KS, Harper County, KS, Harvey County, KS, Kingman County, KS, Marion County, KS, McPherson County, KS, Montgomery County, KS, Neosho County, KS, Pratt County, KS, Reno County, KS, Sedgwick County, KS, Sumner County, KS, Wilson County, KS, Woodson County, KS, Alfalfa County, OK, Beckham County, OK, Blaine County, OK, Caddo County, OK, Canadian County, OK, Carter County, OK, Cleveland County, OK, Comanche County, OK, Cotton County, OK, Custer County, OK, Dewey County, OK, Ellis County, OK, Garfield County, OK, Garvin County, OK, Grady County, OK, Grant County, OK, Greer County, OK, Harmon County, OK, Harper County, OK, Jackson County, OK, Jefferson County, OK, Kay County, OK, Kingfisher County, OK, Kiowa County, OK, Lincoln County, OK, Logan County, OK, Love County, OK, Major County, OK, McClain County, OK, Murray County, OK, Noble County, OK, Oklahoma County, OK, Osage County, OK, Pawnee County, OK, Payne County, OK, Pontotoc County, OK, Pottawatomie County, OK, Roger Mills County, OK, Seminole County, OK, Stephens County, OK, Tillman County, OK, Washita County, OK, Woods County, OK, Woodward County, OK, Archer County, TX, Baylor County, TX, Childress County, TX, Clay County, TX, Collingsworth County, TX, Cottle County, TX, Dickens County, TX, Foard County, TX, Hall County, TX, Hardeman County, TX, Hemphill County, TX, Kent County, TX, King County, TX, Knox County, TX, Lipscomb County, TX, Motley County, TX, Stonewall County, TX, Wheeler County, TX, Wichita County, TX, Wilbarger County, TX

The radar

The Vance AFB radar (KVNX), 77 km from the middle of the area, began a volume at 01:46 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, 1.7 hours before the alert went out and 104 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 2009-04-27Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 617 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 2009-04-27The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 359 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
617 J/kg
Mixed-layer CIN
-175 J/kg
Mixed-layer LCL
936 m above ground
0-6 km bulk shear
48 kt
0-1 km storm-relative helicity
359 m²/s²
0-3 km storm-relative helicity
443 m²/s²
Significant tornado parameter
0.2
Supercell composite
3.8

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

<!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 26, 8:21 PM CDTMesoscale DiscussionSPCAnderson, Atchison, Brown, Chase, Coffey, Doniphan and 16 more54 min
Apr 27, 12:32 PM CDTMesoscale DiscussionSPCBourbon, Chautauqua, Cherokee, Crawford, Labette, Montgomery and 2 more88 min
Apr 27, 12:47 PM CDTSevere Thunderstorm WatchSPCAllen, Bourbon, Cherokee, Crawford, Labette, Montgomery and 2 more6 hr
Apr 27, 3:28 PM CDTMesoscale DiscussionSPCCherokee, Labette2 hr
Apr 27, 6:03 PM CDTMesoscale DiscussionSPCChautauqua, Cherokee, Crawford, Labette, Montgomery27 min
Apr 27, 9:28 AM CDTSevere Thunderstorm WatchSPCMcCurtain12 hr
Apr 26, 8:04 PM CDTTornado WatchSPCBlanco, Brown, Burnet, Callahan, Coke, Coleman and 30 more7 hr
Apr 26, 10:46 PM CDTMesoscale DiscussionSPCBlanco, Brown, Callahan, Coke, Coleman, Concho and 22 more119 min
Apr 27, 1:49 AM CDTMesoscale DiscussionSPCBrown, Callahan, Coke, Coleman, Concho, Crockett and 24 more86 min
Apr 27, 2:44 AM CDTSevere Thunderstorm WatchSPCBrown, Callahan, Coke, Coleman, Concho, Crockett and 23 more7 hr
Apr 27, 5:36 AM CDTMesoscale DiscussionSPCBosque, Brown, Coke, Comanche, Concho, Coryell and 17 more84 min
Apr 27, 6:08 AM CDTTornado WatchSPCAnderson, Bastrop, Bell, Blanco, Bosque, Brazos and 33 more7 hr
Apr 27, 7:43 AM CDTMesoscale DiscussionSPCCoke, Concho, Crockett, Irion, Kimble, McCulloch and 8 more92 min
Apr 27, 7:55 AM CDTSevere Thunderstorm WatchSPCBandera, Bexar, Comal, Edwards, Frio, Guadalupe and 9 more5 hr
Apr 27, 8:59 AM CDTMesoscale DiscussionSPCAnderson, Angelina, Bell, Brazos, Burleson, Burnet and 38 more91 min
Apr 27, 11:42 AM CDTMesoscale DiscussionSPCAnderson, Bastrop, Bell, Blanco, Brazos, Burleson and 19 more63 min
Apr 27, 12:00 PM CDTMesoscale DiscussionSPCAtascosa, Bandera, Bexar, Comal, Edwards, Kendall and 6 more60 min
Apr 27, 1:14 PM CDTMesoscale DiscussionSPCBowie, Camp, Cass, Gregg, Harrison, Marion and 8 more91 min
Apr 27, 2:24 PM CDTMesoscale DiscussionSPCAngelina, Bowie, Cass, Cherokee, Gregg, Harrison and 10 more66 min
Apr 27, 2:57 PM CDTSevere Thunderstorm WatchSPCBowie, Cass, Harrison, Marion, Panola, Shelby6 hr
Apr 27, 3:50 PM CDTMesoscale DiscussionSPCAransas, Austin, Bee, Brazoria, Calhoun, Chambers and 20 more85 min
Apr 27, 3:58 PM CDTTornado WatchSPCBrazoria, Calhoun, Chambers, Colorado, DeWitt, Fort Bend and 10 more5 hr
Apr 27, 5:59 PM CDTMesoscale DiscussionSPCBorden, Dawson, Fisher, Garza, Kent, Lynn and 4 more2 hr
Apr 27, 6:30 PM CDTMesoscale DiscussionSPCAransas, Brazoria, Calhoun, Chambers, Galveston, Hardin and 4 more2 hr

Nearby

Mesoscale Discussions in Oklahoma, 2009Mesoscale Discussions in Kansas, 2009Mesoscale Discussions in Texas, 2009Every mesoscale discussion in 2009

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.