Alert archive / Oklahoma / Mesoscale Discussions in 2020
Mesoscale Discussion 435
The Storm Prediction Center issued this mesoscale discussion at Apr 22, 2020, 8:36 AM CDT for 32 counties in Oklahoma. It was in force for 84 min.
The area
The outline as issued.
The facts
- Issued
- Apr 22, 2020, 8:36 AM CDT (13:36 UTC)
- Expired
- Apr 22, 2020, 10:00 AM CDT
- In force
- 84 min
- Issued by
- the Storm Prediction Center
- Chance of a watch
- 60%
All 32 counties
Atoka County, OK, Blaine County, OK, Caddo County, OK, Canadian County, OK, Carter County, OK, Cleveland County, OK, Coal County, OK, Comanche County, OK, Cotton County, OK, Creek County, OK, Garvin County, OK, Grady County, OK, Haskell County, OK, Hughes County, OK, Johnston County, OK, Kingfisher County, OK, Latimer County, OK, Lincoln County, OK, Logan County, OK, McClain County, OK, McIntosh County, OK, Murray County, OK, Okfuskee County, OK, Oklahoma County, OK, Okmulgee County, OK, Payne County, OK, Pittsburg County, OK, Pontotoc County, OK, Pottawatomie County, OK, Pushmataha County, OK, Seminole County, OK, Stephens County, OK
The radar
The Norman radar (KTLX), 49 km from the middle of the area, began a volume at 13:39 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, 1.6 hours before the alert went out and 47 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
- 20 J/kg
- Mixed-layer CIN
- -449 J/kg
- Mixed-layer LCL
- 1138 m above ground
- 0-6 km bulk shear
- 65 kt
- 0-1 km storm-relative helicity
- 375 m²/s²
- 0-3 km storm-relative helicity
- 455 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 1.5
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.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 21, 9:10 PM CDT | Mesoscale Discussion | SPC | Beckham, Blaine, Caddo, Canadian, Carter, Cleveland and 24 more | 95 min |
| Apr 21, 11:32 PM CDT | Mesoscale Discussion | SPC | Beckham, Blaine, Caddo, Canadian, Carter, Cleveland and 24 more | 88 min |
| Apr 22, 1:21 AM CDT | Mesoscale Discussion | SPC | Atoka, Bryan, Carter, Choctaw, Coal, Garvin and 7 more | 84 min |
| Apr 22, 1:46 AM CDT | Severe Thunderstorm Watch | SPC | Atoka, Bryan, Carter, Choctaw, Garvin, Johnston and 6 more | 4 hr |
| Apr 22, 2:16 AM CDT | Mesoscale Discussion | SPC | Beaver, Ellis, Harper, Texas, Woods, Woodward | 119 min |
| Apr 22, 8:53 AM CDT | Severe Thunderstorm Watch | SPC | Adair, Atoka, Bryan, Caddo, Canadian, Carter and 46 more | 6 hr |
| Apr 22, 11:29 AM CDT | Mesoscale Discussion | SPC | Atoka, Coal, Haskell, Hughes, Latimer, LeFlore and 5 more | 91 min |
| Apr 22, 1:12 PM CDT | Mesoscale Discussion | SPC | Atoka, Bryan, Carter, Choctaw, Coal, Garvin and 7 more | 63 min |
| Apr 22, 2:33 PM CDT | Tornado Watch | SPC | Atoka, Bryan, Carter, Choctaw, Coal, Garvin and 11 more | 6 hr |
| Apr 22, 4:43 PM CDT | Mesoscale Discussion | SPC | Atoka, Bryan, Coal, Garvin, Johnston, Marshall and 2 more | 62 min |
| Apr 22, 6:39 PM CDT | Mesoscale Discussion | SPC | McCurtain | 66 min |
Nearby
Mesoscale Discussions in Oklahoma, 2020Every mesoscale discussion in 2020
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.