Alert archive / North Carolina / Mesoscale Discussions in 2019

Mesoscale Discussion 613

May 11, 201913 counties in North Carolina; 8 counties in South Carolina

The Storm Prediction Center issued this mesoscale discussion at May 11, 2019, 2:45 PM EDT for 13 counties in North Carolina; 8 counties in South Carolina. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued: May 11, 2019, 2:45 PM EDT (18:45 UTC)
Expired: May 11, 2019, 4:45 PM EDT
In force: 2 hr
Issued by: the Storm Prediction Center
Chance of a watch: 5%

All 21 counties

Anson County, NC, Cabarrus County, NC, Chatham County, NC, Gaston County, NC, Hoke County, NC, Lee County, NC, Mecklenburg County, NC, Montgomery County, NC, Moore County, NC, Richmond County, NC, Scotland County, NC, Stanly County, NC, Union County, NC, Cherokee County, SC, Chester County, SC, Chesterfield County, SC, Lancaster County, SC, Laurens County, SC, Marlboro County, SC, Union County, SC, York County, SC

The radar

The Columbia radar (KCAE), 110 km from the middle of the area, began a volume at 18:47 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

Greensboro/Hi Pt, NC (KGSO), launched 12:00Z, 6.8 hours before the alert went out and 153 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: 401 J/kg
Mixed-layer CIN: -37 J/kg
Mixed-layer LCL: 702 m above ground
0-6 km bulk shear: 36 kt
0-1 km storm-relative helicity: 15 m²/s²
0-3 km storm-relative helicity: 18 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.1

Open this sounding in Storm Lab

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
May 11, 6:11 PM EDT	Mesoscale Discussion	SPC	Aiken, Allendale, Bamberg, Barnwell, Edgefield, Hampton	94 min

Nearby

Mesoscale Discussions in North Carolina, 2019 Mesoscale Discussions in South Carolina, 2019 Every mesoscale discussion in 2019

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.