Alert archive / Arkansas / Mesoscale Discussions in 2017
Mesoscale Discussion 230
The Storm Prediction Center issued this mesoscale discussion at Feb 28, 2017, 10:46 PM CST for 26 counties in Arkansas; 17 counties in Oklahoma; Fannin County, Lamar County, Red River County, Texas. It was in force for 119 min.
The area
The outline as issued.
The facts
- Issued
- Feb 28, 2017, 10:46 PM CST (04:46 UTC)
- Expired
- Mar 1, 2017, 12:45 AM CST
- In force
- 119 min
- Issued by
- the Storm Prediction Center
- Chance of a watch
- 80%
All 46 counties
Boone County, AR, Carroll County, AR, Conway County, AR, Crawford County, AR, Franklin County, AR, Garland County, AR, Hempstead County, AR, Howard County, AR, Johnson County, AR, Little River County, AR, Logan County, AR, Madison County, AR, Marion County, AR, Montgomery County, AR, Newton County, AR, Perry County, AR, Pike County, AR, Polk County, AR, Pope County, AR, Scott County, AR, Searcy County, AR, Sebastian County, AR, Sevier County, AR, Van Buren County, AR, Washington County, AR, Yell County, AR, Adair County, OK, Atoka County, OK, Bryan County, OK, Choctaw County, OK, Coal County, OK, Haskell County, OK, Hughes County, OK, Johnston County, OK, Latimer County, OK, LeFlore County, OK, Marshall County, OK, McCurtain County, OK, McIntosh County, OK, Muskogee County, OK, Pittsburg County, OK, Pushmataha County, OK, Sequoyah County, OK, Fannin County, TX, Lamar County, TX, Red River County, TX
The radar
The Western Arkansas radar (KSRX), 65 km from the middle of the area, began a volume at 04:48 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
Springfield, MO (KSGF), launched 00:00Z, 4.8 hours before the alert went out and 251 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
- 1117 J/kg
- Mixed-layer CIN
- -52 J/kg
- Mixed-layer LCL
- 931 m above ground
- 0-6 km bulk shear
- 65 kt
- 0-1 km storm-relative helicity
- 341 m²/s²
- 0-3 km storm-relative helicity
- 315 m²/s²
- Significant tornado parameter
- 2.3
- Supercell composite
- 8.2
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 |
|---|---|---|---|---|
| Feb 28, 7:46 PM CST | Mesoscale Discussion | SPC | Baxter, Clay, Cleburne, Craighead, Cross, Fulton and 14 more | 119 min |
| Feb 28, 8:29 PM CST | Tornado Watch | SPC | Clay, Craighead, Greene, Lawrence, Mississippi, Poinsett and 1 more | 12 hr |
| Feb 28, 9:04 PM CST | Tornado Watch | SPC | Benton, Carroll, Madison, Washington | 7 hr |
| Feb 28, 11:35 PM CST | Tornado Watch | SPC | Baxter, Boone, Cleburne, Conway, Crawford, Faulkner and 24 more | 5 hr |
| Mar 1, 2:09 AM CST | Mesoscale Discussion | SPC | Arkansas, Clark, Clay, Cleburne, Cleveland, Conway and 38 more | 2 hr |
| Mar 1, 3:03 AM CST | Tornado Watch | SPC | Clay, Craighead, Crittenden, Cross, Greene, Lawrence and 4 more | 5 hr |
| Mar 1, 4:19 AM CST | Mesoscale Discussion | SPC | Crittenden | 56 min |
| Feb 28, 10:01 PM CST | Mesoscale Discussion | SPC | Craig, Delaware, Mayes, Nowata, Osage, Ottawa and 4 more | 119 min |
Nearby
Mesoscale Discussions in Arkansas, 2017Mesoscale Discussions in Oklahoma, 2017Mesoscale Discussions in Texas, 2017Every mesoscale discussion in 2017
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.