Alert archive / Arkansas / Mesoscale Discussions in 2013
Mesoscale Discussion 15
The Storm Prediction Center issued this mesoscale discussion at Jan 12, 2013, 1:25 PM CST for 32 counties in Arkansas; Dunklin County, Pemiscot County, Missouri; 4 counties in Texas. It was in force for 3 hr.
The area
The outline as issued.
The facts
- Issued
- Jan 12, 2013, 1:25 PM CST (19:25 UTC)
- Expired
- Jan 12, 2013, 4:00 PM CST
- In force
- 3 hr
- Issued by
- the Storm Prediction Center
- Chance of a watch
- 80%
All 38 counties
Clark County, AR, Clay County, AR, Cleburne County, AR, Conway County, AR, Craighead County, AR, Cross County, AR, Dallas County, AR, Faulkner County, AR, Garland County, AR, Grant County, AR, Greene County, AR, Hempstead County, AR, Hot Spring County, AR, Howard County, AR, Independence County, AR, Jackson County, AR, Lawrence County, AR, Little River County, AR, Lonoke County, AR, Miller County, AR, Mississippi County, AR, Montgomery County, AR, Nevada County, AR, Perry County, AR, Pike County, AR, Poinsett County, AR, Prairie County, AR, Pulaski County, AR, Saline County, AR, Sevier County, AR, White County, AR, Woodruff County, AR, Dunklin County, MO, Pemiscot County, MO, Bowie County, TX, Cass County, TX, Morris County, TX, Titus County, TX
The radar
The Little Rock radar (KLZK), 88 km from the middle of the area, began a volume at 19:24 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
Shreveport, LA (KSHV), launched 12:00Z, 7.4 hours before the alert went out and 219 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
- 1176 J/kg
- Mixed-layer CIN
- -18 J/kg
- Mixed-layer LCL
- 463 m above ground
- 0-6 km bulk shear
- 54 kt
- 0-1 km storm-relative helicity
- 201 m²/s²
- 0-3 km storm-relative helicity
- 205 m²/s²
- Significant tornado parameter
- 1.4
- Supercell composite
- 7.8
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 |
|---|---|---|---|---|
| Jan 12, 5:20 PM CST | Tornado Watch | SPC | Arkansas, Bradley, Calhoun, Clark, Clay, Cleburne and 47 more | 7 hr |
| Jan 12, 3:45 PM CST | Mesoscale Discussion | SPC | Audrain, Barton, Bates, Benton, Boone, Callaway and 37 more | 6 hr |
Nearby
Mesoscale Discussions in Arkansas, 2013Mesoscale Discussions in Texas, 2013Mesoscale Discussions in Missouri, 2013Every mesoscale discussion in 2013
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.