Alert archive / Georgia / Mesoscale Discussions in 2011

Mesoscale Discussion 742

May 11, 20117 counties in Georgia; 6 counties in North Carolina; 7 counties in South Carolina

The Storm Prediction Center issued this mesoscale discussion at May 11, 2011, 6:06 PM EDT for 7 counties in Georgia; 6 counties in North Carolina; 7 counties in South Carolina. It was in force for 54 min.

The area

The outline as issued.

The facts

Issued: May 11, 2011, 6:06 PM EDT (22:06 UTC)
Expired: May 11, 2011, 7:00 PM EDT
In force: 54 min
Issued by: the Storm Prediction Center

Counties Banks County, GA, Elbert County, GA, Franklin County, GA, Hart County, GA, Madison County, GA, Rabun County, GA, Stephens County, GA, Buncombe County, NC, Haywood County, NC, Henderson County, NC, Jackson County, NC, Polk County, NC, Transylvania County, NC, Abbeville County, SC, Anderson County, SC, Greenville County, SC, Greenwood County, SC, McCormick County, SC, Oconee County, SC, Pickens County, SC

The radar

The Greer radar (KGSP), 51 km from the middle of the area, began a volume at 22:06 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

Peachtre/Fal Fld, GA (KFFC), launched 12:00Z, 10.1 hours before the alert went out and 221 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.

Skew-T log-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.

Mixed-layer CAPE: 1711 J/kg
Mixed-layer CIN: -64 J/kg
Mixed-layer LCL: 1007 m above ground
0-6 km bulk shear: 21 kt
0-1 km storm-relative helicity: 16 m²/s²
0-3 km storm-relative helicity: 33 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.7

Open this sounding in Storm Lab

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
May 10, 9:01 PM EDT	Mesoscale Discussion	SPC	Alexander, Alleghany, Anson, Ashe, Avery, Bladen and 46 more	59 min
May 10, 10:18 PM EDT	Mesoscale Discussion	SPC	Alexander, Ashe, Avery, Buncombe, Burke, Caldwell and 16 more	27 min
May 10, 10:42 PM EDT	Severe Thunderstorm Watch	SPC	Alexander, Avery, Buncombe, Burke, Caldwell, Catawba and 13 more	4 hr
May 11, 12:14 AM EDT	Mesoscale Discussion	SPC	Alexander, Alleghany, Ashe, Avery, Buncombe, Burke and 17 more	61 min
May 11, 2:37 AM EDT	Mesoscale Discussion	SPC	Alexander, Ashe, Avery, Buncombe, Burke, Caldwell and 14 more	23 min
May 11, 12:41 AM EDT	Severe Thunderstorm Watch	SPC	Aiken, Bamberg, Barnwell, Calhoun, Chesterfield, Clarendon and 11 more	3 hr
May 11, 1:35 AM EDT	Mesoscale Discussion	SPC	Berkeley, Charleston, Darlington, Dorchester, Florence, Georgetown and 2 more	25 min
May 11, 1:41 AM EDT	Severe Thunderstorm Watch	SPC	Berkeley, Charleston, Darlington, Dillon, Dorchester, Florence and 5 more	3 hr
May 11, 3:34 AM EDT	Mesoscale Discussion	SPC	Berkeley, Charleston, Chesterfield, Colleton, Darlington, Dillon and 7 more	56 min

Nearby

Mesoscale Discussions in Georgia, 2011 Mesoscale Discussions in South Carolina, 2011 Mesoscale Discussions in North Carolina, 2011 Every mesoscale discussion in 2011

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.