Alert archive / Alabama / Mesoscale Discussions in 2018
Mesoscale Discussion 218
The Storm Prediction Center issued this mesoscale discussion at Apr 3, 2018, 11:09 PM CDT for 27 counties in Alabama; 22 counties in Georgia. It was in force for 66 min.
The area
The outline as issued.
The facts
- Issued
- Apr 3, 2018, 11:09 PM CDT (04:09 UTC)
- Expired
- Apr 4, 2018, 12:15 AM CDT
- In force
- 66 min
- Issued by
- the Storm Prediction Center
All 49 counties
Autauga County, AL, Bibb County, AL, Calhoun County, AL, Cherokee County, AL, Chilton County, AL, Choctaw County, AL, Clarke County, AL, Clay County, AL, Cleburne County, AL, Coosa County, AL, Dallas County, AL, DeKalb County, AL, Elmore County, AL, Etowah County, AL, Hale County, AL, Jackson County, AL, Jefferson County, AL, Lowndes County, AL, Marengo County, AL, Marshall County, AL, Perry County, AL, Randolph County, AL, Shelby County, AL, St. Clair County, AL, Talladega County, AL, Tallapoosa County, AL, Wilcox County, AL, Bartow County, GA, Carroll County, GA, Catoosa County, GA, Chattooga County, GA, Cherokee County, GA, Cobb County, GA, Dade County, GA, Dawson County, GA, Douglas County, GA, Floyd County, GA, Forsyth County, GA, Gilmer County, GA, Gordon County, GA, Haralson County, GA, Lumpkin County, GA, Murray County, GA, Paulding County, GA, Pickens County, GA, Polk County, GA, Walker County, GA, White County, GA, Whitfield County, GA
The radar
The Birmingham radar (KBMX), 45 km from the middle of the area, began a volume at 04:07 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
Birmingham, AL (KBMX), launched 00:00Z, 4.2 hours before the alert went out and 45 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
- 156 J/kg
- Mixed-layer CIN
- -75 J/kg
- Mixed-layer LCL
- 1767 m above ground
- 0-6 km bulk shear
- 34 kt
- 0-1 km storm-relative helicity
- 88 m²/s²
- 0-3 km storm-relative helicity
- 134 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.5
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 3, 7:14 PM CDT | Severe Thunderstorm Watch | SPC | Colbert, Cullman, DeKalb, Fayette, Franklin, Jackson and 10 more | 5 hr |
| Apr 3, 9:47 PM CDT | Severe Thunderstorm Watch | SPC | Bibb, Blount, Calhoun, Cherokee, Chilton, Clay and 13 more | 4 hr |
| Apr 4, 1:00 AM CDT | Mesoscale Discussion | SPC | Autauga, Chambers, Chilton, Clay, Cleburne, Coosa and 4 more | 105 min |
| Apr 3, 10:49 PM CDT | Mesoscale Discussion | SPC | Catoosa | 86 min |
Nearby
Mesoscale Discussions in Alabama, 2018Mesoscale Discussions in Georgia, 2018Every mesoscale discussion in 2018
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.