Alert archive / Oklahoma / Mesoscale Discussions in 2011
Mesoscale Discussion 518
The Storm Prediction Center issued this mesoscale discussion at Apr 22, 2011, 1:23 PM CDT for 4 states. It was in force for 97 min.
The area
The outline as issued.
The facts
- Issued
- Apr 22, 2011, 1:23 PM CDT (18:23 UTC)
- Expired
- Apr 22, 2011, 3:00 PM CDT
- In force
- 97 min
- Issued by
- the Storm Prediction Center
All 75 counties
Benton County, AR, Crawford County, AR, Sebastian County, AR, Washington County, AR, McDonald County, MO, Newton County, MO, Adair County, OK, Atoka County, OK, Bryan County, OK, Carter County, OK, Cherokee County, OK, Choctaw County, OK, Cleveland County, OK, Coal County, OK, Cotton County, OK, Craig County, OK, Creek County, OK, Delaware County, OK, Garvin County, OK, Grady County, OK, Haskell County, OK, Hughes County, OK, Jefferson County, OK, Johnston County, OK, Latimer County, OK, LeFlore County, OK, Lincoln County, OK, Love County, OK, Marshall County, OK, Mayes County, OK, McClain County, OK, McCurtain County, OK, McIntosh County, OK, Murray County, OK, Muskogee County, OK, Nowata County, OK, Okfuskee County, OK, Oklahoma County, OK, Okmulgee County, OK, Ottawa County, OK, Pittsburg County, OK, Pontotoc County, OK, Pottawatomie County, OK, Pushmataha County, OK, Rogers County, OK, Seminole County, OK, Sequoyah County, OK, Stephens County, OK, Tulsa County, OK, Wagoner County, OK, Washington County, OK, Archer County, TX, Clay County, TX, Collin County, TX, Cooke County, TX, Delta County, TX, Denton County, TX, Fannin County, TX, Franklin County, TX, Grayson County, TX, Hopkins County, TX, Hunt County, TX, Jack County, TX, Lamar County, TX, Montague County, TX, Palo Pinto County, TX, Parker County, TX, Red River County, TX, Rockwall County, TX, Stephens County, TX, Tarrant County, TX, Throckmorton County, TX, Wichita County, TX, Wise County, TX, Young County, TX
The radar
The Norman radar (KTLX), 112 km from the middle of the area, began a volume at 18:24 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
Norman, OK (KOUN), launched 12:00Z, 6.4 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.
- Mixed-layer CAPE
- 1839 J/kg
- Mixed-layer CIN
- -330 J/kg
- Mixed-layer LCL
- 987 m above ground
- 0-6 km bulk shear
- 36 kt
- 0-1 km storm-relative helicity
- 514 m²/s²
- 0-3 km storm-relative helicity
- 647 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.3
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.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 22, 10:44 AM CDT | Mesoscale Discussion | SPC | Baxter, Benton, Boone, Carroll, Crawford, Franklin and 7 more | 61 min |
| Apr 22, 3:47 PM CDT | Tornado Watch | SPC | Benton, Carroll, Crawford, Franklin, Madison, Sebastian and 1 more | 8 hr |
| Apr 21, 11:27 PM CDT | Mesoscale Discussion | SPC | Barton, Bates, Buchanan, Cass, Clay, Jackson and 3 more | 3 hr |
| Apr 22, 2:48 AM CDT | Severe Thunderstorm Watch | SPC | Andrew, Bates, Buchanan, Cass, Clay, Clinton and 4 more | 4 hr |
| Apr 22, 5:18 AM CDT | Mesoscale Discussion | SPC | Buchanan, Caldwell, Cass, Clay, Clinton, Jackson and 2 more | 87 min |
| Apr 22, 10:09 AM CDT | Mesoscale Discussion | SPC | Bollinger, Cape Girardeau, Crawford, Dent, Franklin, Gasconade and 17 more | 66 min |
| Apr 22, 1:04 PM CDT | Mesoscale Discussion | SPC | Barry, Barton, Benton, Callaway, Camden, Cedar and 40 more | 116 min |
| Apr 22, 3:34 PM CDT | Tornado Watch | SPC | Audrain, Barry, Benton, Boone, Callaway, Camden and 46 more | 6 hr |
| Apr 22, 5:21 PM CDT | Mesoscale Discussion | SPC | Audrain, Barry, Boone, Callaway, Camden, Christian and 36 more | 114 min |
| Apr 22, 5:27 PM CDT | Mesoscale Discussion | SPC | Cape Girardeau, Perry, Sainte Genevieve, Saint Francois | 33 min |
| Apr 22, 5:49 PM CDT | Tornado Watch | SPC | Bollinger, Butler, Cape Girardeau, Carter, Iron, Madison and 9 more | 7 hr |
| Apr 21, 9:15 PM CDT | Mesoscale Discussion | SPC | Archer, Baylor, Callahan, Coke, Coleman, Concho and 26 more | 60 min |
| Apr 22, 5:43 PM CDT | Mesoscale Discussion | SPC | Archer, Callahan, Clay, Coleman, Comanche, Cooke and 17 more | 92 min |
| Apr 22, 6:10 PM CDT | Severe Thunderstorm Watch | SPC | Archer, Brown, Callahan, Clay, Coke, Coleman and 21 more | 6 hr |
Nearby
Mesoscale Discussions in Oklahoma, 2011Mesoscale Discussions in Texas, 2011Mesoscale Discussions in Arkansas, 2011Every mesoscale discussion in 2011
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.