Alert archive / South Carolina / Mesoscale Discussions in 2013

Mesoscale Discussion 238

February 26, 20135 counties in North Carolina; 13 counties in South Carolina

The Storm Prediction Center issued this mesoscale discussion at Feb 26, 2013, 2:44 PM EST for 5 counties in North Carolina; 13 counties in South Carolina. It was in force for 91 min.

The area

The outline as issued.

The facts

Issued: Feb 26, 2013, 2:44 PM EST (19:44 UTC)
Expired: Feb 26, 2013, 4:15 PM EST
In force: 91 min
Issued by: the Storm Prediction Center
Chance of a watch: 40%

Counties Bladen County, NC, Brunswick County, NC, Columbus County, NC, New Hanover County, NC, Pender County, NC, Beaufort County, SC, Berkeley County, SC, Charleston County, SC, Clarendon County, SC, Colleton County, SC, Dorchester County, SC, Florence County, SC, Georgetown County, SC, Horry County, SC, Jasper County, SC, Marion County, SC, Orangeburg County, SC, Williamsburg County, SC

The radar

The Wilmington radar (KLTX), 128 km from the middle of the area, began a volume at 19:44 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

Charleston AFB, SC (KCHS), launched 12:00Z, 7.7 hours before the alert went out and 63 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: 97 J/kg
Mixed-layer CIN: -32 J/kg
Mixed-layer LCL: 434 m above ground
0-6 km bulk shear: 47 kt
0-1 km storm-relative helicity: 361 m²/s²
0-3 km storm-relative helicity: 533 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.3

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
Feb 26, 6:54 AM EST	Mesoscale Discussion	SPC	Alleghany, Forsyth, Rockingham, Stokes, Surry, Wilkes and 1 more	4 hr
Feb 26, 8:44 AM EST	Mesoscale Discussion	SPC	Brunswick, Columbus, New Hanover, Pender	3 hr
Feb 26, 6:17 PM EST	Mesoscale Discussion	SPC	Beaufort, Bladen, Brunswick, Columbus, Craven, Cumberland and 11 more	118 min
Feb 26, 11:38 AM EST	Mesoscale Discussion	SPC	Allendale, Bamberg, Barnwell, Beaufort, Berkeley, Charleston and 6 more	67 min

Nearby

Mesoscale Discussions in South Carolina, 2013 Mesoscale Discussions in North Carolina, 2013 Every 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.