Alert archive / Oklahoma / Mesoscale Discussions in 2020
Mesoscale Discussion 489
The Storm Prediction Center issued this mesoscale discussion at Apr 28, 2020, 6:15 PM CDT for 5 counties in Arkansas; Barry County, McDonald County, Newton County, Missouri; 12 counties in Oklahoma. It was in force for 2 hr.
The area
The outline as issued.
The facts
- Issued
- Apr 28, 2020, 6:15 PM CDT (23:15 UTC)
- Expired
- Apr 28, 2020, 8:15 PM CDT
- In force
- 2 hr
- Issued by
- the Storm Prediction Center
Counties Benton County, AR, Carroll County, AR, Crawford County, AR, Madison County, AR, Washington County, AR, Barry County, MO, McDonald County, MO, Newton County, MO, Adair County, OK, Cherokee County, OK, Delaware County, OK, Haskell County, OK, Mayes County, OK, McIntosh County, OK, Muskogee County, OK, Okmulgee County, OK, Ottawa County, OK, Pittsburg County, OK, Sequoyah County, OK, Wagoner County, OK
The radar
The Tulsa radar (KINX), 47 km from the middle of the area, began a volume at 23:15 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
Springfield, MO (KSGF), launched 12:00Z, 11.3 hours before the alert went out and 139 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
- 55 J/kg
- Mixed-layer CIN
- -231 J/kg
- Mixed-layer LCL
- 1021 m above ground
- 0-6 km bulk shear
- 28 kt
- 0-1 km storm-relative helicity
- 369 m²/s²
- 0-3 km storm-relative helicity
- 342 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 2.1
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 28, 1:55 PM CDT | Mesoscale Discussion | SPC | Benton, Carroll, Crawford, Madison, Washington | 3 hr |
| Apr 28, 3:18 PM CDT | Tornado Watch | SPC | Benton, Carroll, Crawford, Franklin, Madison, Sebastian and 1 more | 8 hr |
| Apr 28, 6:41 PM CDT | Mesoscale Discussion | SPC | Baxter, Clay, Cleburne, Conway, Craighead, Faulkner and 21 more | 64 min |
| Apr 28, 3:33 PM CDT | Mesoscale Discussion | SPC | Audrain, Benton, Boone, Callaway, Carroll, Chariton and 32 more | 87 min |
| Apr 28, 3:51 PM CDT | Severe Thunderstorm Watch | SPC | Audrain, Bates, Benton, Boone, Callaway, Camden and 54 more | 7 hr |
| Apr 28, 6:32 PM CDT | Mesoscale Discussion | SPC | Audrain, Barton, Benton, Bollinger, Boone, Callaway and 50 more | 118 min |
| Apr 28, 3:30 PM CDT | Severe Thunderstorm Watch | SPC | Atoka, Bryan, Caddo, Canadian, Carter, Cleveland and 26 more | 8 hr |
Nearby
Mesoscale Discussions in Oklahoma, 2020Mesoscale Discussions in Arkansas, 2020Mesoscale Discussions in Missouri, 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.