Alert archive / Oklahoma / Mesoscale Discussions in 2011
Mesoscale Discussion 1940
The Storm Prediction Center issued this mesoscale discussion at Aug 11, 2011, 3:15 AM CDT for Harper County, Kansas; 17 counties in Oklahoma; 13 counties in Texas. It was in force for 90 min.
The area
The outline as issued.
The facts
- Issued
- Aug 11, 2011, 3:15 AM CDT (08:15 UTC)
- Expired
- Aug 11, 2011, 4:45 AM CDT
- In force
- 90 min
- Issued by
- the Storm Prediction Center
All 31 counties
Harper County, KS, Alfalfa County, OK, Beaver County, OK, Beckham County, OK, Blaine County, OK, Custer County, OK, Dewey County, OK, Ellis County, OK, Garfield County, OK, Grant County, OK, Harper County, OK, Kingfisher County, OK, Major County, OK, Roger Mills County, OK, Texas County, OK, Washita County, OK, Woods County, OK, Woodward County, OK, Carson County, TX, Gray County, TX, Hansford County, TX, Hartley County, TX, Hemphill County, TX, Hutchinson County, TX, Lipscomb County, TX, Moore County, TX, Ochiltree County, TX, Potter County, TX, Roberts County, TX, Sherman County, TX, Wheeler County, TX
The radar
The Amarillo radar (KAMA), 138 km from the middle of the area, began a volume at 08:19 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
Amarillo Airport, TX (KAMA), launched 00:00Z, 8.3 hours before the alert went out and 137 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
- 1689 J/kg
- Mixed-layer CIN
- -88 J/kg
- Mixed-layer LCL
- 2170 m above ground
- 0-6 km bulk shear
- 24 kt
- 0-1 km storm-relative helicity
- 1 m²/s²
- 0-3 km storm-relative helicity
- 246 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 6.5
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 |
|---|---|---|---|---|
| Aug 10, 7:50 PM CDT | Severe Thunderstorm Watch | SPC | Cheyenne, Decatur, Gove, Logan, Rawlins, Sheridan and 3 more | 3 hr |
| Aug 10, 10:10 PM CDT | Mesoscale Discussion | SPC | Cheyenne, Decatur, Logan, Rawlins, Sheridan, Sherman and 1 more | 95 min |
| Aug 10, 7:23 PM CDT | Mesoscale Discussion | SPC | Adair, Cherokee, Creek, Haskell, Hughes, Latimer and 12 more | 97 min |
| Aug 11, 2:13 PM CDT | Mesoscale Discussion | SPC | Choctaw, McCurtain | 62 min |
| Aug 11, 5:06 PM CDT | Mesoscale Discussion | SPC | Armstrong, Bailey, Briscoe, Castro, Cochran, Crosby and 15 more | 84 min |
Nearby
Mesoscale Discussions in Oklahoma, 2011Mesoscale Discussions in Texas, 2011Mesoscale Discussions in Kansas, 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.