Alert archive / South Carolina / Mesoscale Discussions in 2015
Mesoscale Discussion 400
The Storm Prediction Center issued this mesoscale discussion at Apr 20, 2015, 4:18 PM EDT for 15 counties in Georgia; 18 counties in North Carolina; 19 counties in South Carolina. It was in force for 57 min.
The area
The outline as issued.
The facts
- Issued
- Apr 20, 2015, 4:18 PM EDT (20:18 UTC)
- Expired
- Apr 20, 2015, 5:15 PM EDT
- In force
- 57 min
- Issued by
- the Storm Prediction Center
All 52 counties
Banks County, GA, Barrow County, GA, Clarke County, GA, Elbert County, GA, Franklin County, GA, Habersham County, GA, Hall County, GA, Hart County, GA, Jackson County, GA, Lincoln County, GA, Madison County, GA, Oconee County, GA, Oglethorpe County, GA, Stephens County, GA, Wilkes County, GA, Alexander County, NC, Buncombe County, NC, Burke County, NC, Cabarrus County, NC, Caldwell County, NC, Catawba County, NC, Cleveland County, NC, Gaston County, NC, Henderson County, NC, Iredell County, NC, Lincoln County, NC, McDowell County, NC, Mecklenburg County, NC, Polk County, NC, Rowan County, NC, Rutherford County, NC, Transylvania County, NC, Union County, NC, Abbeville County, SC, Anderson County, SC, Cherokee County, SC, Chester County, SC, Edgefield County, SC, Fairfield County, SC, Greenville County, SC, Greenwood County, SC, Lancaster County, SC, Laurens County, SC, Lexington County, SC, McCormick County, SC, Newberry County, SC, Oconee County, SC, Pickens County, SC, Saluda County, SC, Spartanburg County, SC, Union County, SC, York County, SC
The watches that followed
Watches SPC issued over any of the same counties within four hours of this discussion.
The nearest sounding before it
Greensboro/Hi Pt, NC (KGSO), launched 12:00Z, 8.3 hours before the alert went out and 218 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
- 17 J/kg
- Mixed-layer CIN
- -48 J/kg
- Mixed-layer LCL
- 654 m above ground
- 0-6 km bulk shear
- 39 kt
- 0-1 km storm-relative helicity
- 59 m²/s²
- 0-3 km storm-relative helicity
- 77 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.4
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 |
|---|---|---|---|---|
| Apr 20, 2:09 AM EDT | Severe Thunderstorm Watch | SPC | Catoosa, Chattooga, Dade, Floyd, Gordon, Walker and 1 more | 4 hr |
| Apr 20, 3:36 AM EDT | Mesoscale Discussion | SPC | Catoosa, Chattooga, Dade, Floyd, Gordon, Murray and 2 more | 84 min |
| Apr 20, 11:04 AM EDT | Severe Thunderstorm Watch | SPC | Appling, Atkinson, Bacon, Baker, Ben Hill, Berrien and 25 more | 8 hr |
| Apr 20, 1:03 PM EDT | Mesoscale Discussion | SPC | Banks, Clarke, Elbert, Franklin, Habersham, Hall and 7 more | 57 min |
| Apr 20, 1:23 PM EDT | Tornado Watch | SPC | Banks, Barrow, Clarke, Clayton, Cobb, Coweta and 22 more | 7 hr |
| Apr 20, 4:36 PM EDT | Tornado Watch | SPC | Lincoln | 5 hr |
| Apr 20, 6:45 PM EDT | Mesoscale Discussion | SPC | Banks, Barrow, Clarke, DeKalb, Elbert, Forsyth and 17 more | 60 min |
| Apr 19, 9:06 PM EDT | Mesoscale Discussion | SPC | Bladen, Brunswick, Duplin, Durham, Edgecombe, Franklin and 13 more | 54 min |
| Apr 20, 2:25 AM EDT | Mesoscale Discussion | SPC | Beaufort, Bertie, Camden, Chowan, Craven, Currituck and 16 more | 95 min |
| Apr 20, 1:54 PM EDT | Mesoscale Discussion | SPC | Alleghany, Stokes, Surry | 3 hr |
| Apr 20, 2:55 PM EDT | Severe Thunderstorm Watch | SPC | Alamance, Alleghany, Anson, Ashe, Bertie, Caswell and 33 more | 7 hr |
| Apr 20, 6:27 PM EDT | Mesoscale Discussion | SPC | Alamance, Alleghany, Caswell, Chatham, Durham, Forsyth and 16 more | 93 min |
Nearby
Mesoscale Discussions in South Carolina, 2015Mesoscale Discussions in North Carolina, 2015Mesoscale Discussions in Georgia, 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.