Alert archive / Mississippi / Mesoscale Discussions in 2015
Mesoscale Discussion 160
The Storm Prediction Center issued this mesoscale discussion at Mar 31, 2015, 12:41 PM CDT for 11 counties in Arkansas; 23 counties in Mississippi. It was in force for 94 min.
The area
The outline as issued.
The facts
- Issued
- Mar 31, 2015, 12:41 PM CDT (17:41 UTC)
- Expired
- Mar 31, 2015, 2:15 PM CDT
- In force
- 94 min
- Issued by
- the Storm Prediction Center
- Chance of a watch
- 40%
All 34 counties
Arkansas County, AR, Desha County, AR, Grant County, AR, Jefferson County, AR, Lee County, AR, Lincoln County, AR, Lonoke County, AR, Monroe County, AR, Phillips County, AR, Prairie County, AR, Pulaski County, AR, Benton County, MS, Bolivar County, MS, Calhoun County, MS, Carroll County, MS, Chickasaw County, MS, Coahoma County, MS, DeSoto County, MS, Grenada County, MS, Lafayette County, MS, Lee County, MS, Leflore County, MS, Marshall County, MS, Montgomery County, MS, Panola County, MS, Pontotoc County, MS, Quitman County, MS, Sunflower County, MS, Tallahatchie County, MS, Tate County, MS, Tunica County, MS, Union County, MS, Webster County, MS, Yalobusha County, MS
The radar
The Little Rock radar (KLZK), 125 km from the middle of the area, began a volume at 17:43 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
Little Rock, AR (KBYH), launched 12:00Z, 5.7 hours before the alert went out and 106 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
- 836 J/kg
- Mixed-layer CIN
- -130 J/kg
- Mixed-layer LCL
- 924 m above ground
- 0-6 km bulk shear
- 29 kt
- 0-1 km storm-relative helicity
- 179 m²/s²
- 0-3 km storm-relative helicity
- 192 m²/s²
- Significant tornado parameter
- 0.3
- Supercell composite
- 1.7
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 |
|---|---|---|---|---|
| Mar 31, 1:45 PM CDT | Severe Thunderstorm Watch | SPC | Arkansas, Desha, Jefferson, Lincoln, Phillips | 5 hr |
| Mar 31, 2:25 PM CDT | Mesoscale Discussion | SPC | Baxter, Clay, Cleburne, Conway, Craighead, Crittenden and 21 more | 2 hr |
| Mar 31, 3:57 PM CDT | Severe Thunderstorm Watch | SPC | Crawford, Franklin, Sebastian | 6 hr |
| Mar 31, 4:32 PM CDT | Mesoscale Discussion | SPC | Phillips | 58 min |
| Mar 31, 5:13 PM CDT | Severe Thunderstorm Watch | SPC | Clay, Cleburne, Craighead, Crittenden, Cross, Faulkner and 13 more | 7 hr |
Nearby
Mesoscale Discussions in Mississippi, 2015Mesoscale Discussions in Arkansas, 2015Every mesoscale discussion in 2015
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.