Alert archive / South Carolina / Mesoscale Discussions in 2023

Mesoscale Discussion 593

April 22, 20237 counties in North Carolina; 13 counties in South Carolina

The Storm Prediction Center issued this mesoscale discussion at Apr 22, 2023, 12:46 PM EDT for 7 counties in North Carolina; 13 counties in South Carolina. It was in force for 119 min.

The area

The outline as issued.

The facts

Issued: Apr 22, 2023, 12:46 PM EDT (16:46 UTC)
Expired: Apr 22, 2023, 2:45 PM EDT
In force: 119 min
Issued by: the Storm Prediction Center
Concerning: Severe potential...watch possible
Chance of a watch: 60%

Counties Bladen County, NC, Brunswick County, NC, Columbus County, NC, New Hanover County, NC, Onslow County, NC, Pender County, NC, Robeson County, NC, Berkeley County, SC, Charleston County, SC, Clarendon County, SC, Colleton County, SC, Darlington County, SC, Dillon County, SC, Dorchester County, SC, Florence County, SC, Georgetown County, SC, Horry County, SC, Marion County, SC, Marlboro County, SC, Williamsburg County, SC

The radar

The Wilmington radar (KLTX), 108 km from the middle of the area, began a volume at 16:47 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 watches that followed

Watches SPC issued over any of the same counties within four hours of this discussion.

Severe Thunderstorm Watch 161Apr 22, 3:20 PM EDT

The nearest sounding before it

Charleston AFB, SC (KCHS), launched 12:00Z, 4.8 hours before the alert went out and 86 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: 310 J/kg
Mixed-layer CIN: -48 J/kg
Mixed-layer LCL: 650 m above ground
0-6 km bulk shear: 40 kt
0-1 km storm-relative helicity: 206 m²/s²
0-3 km storm-relative helicity: 227 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
Apr 22, 8:07 AM EDT	Mesoscale Discussion	SPC	Alamance, Cabarrus, Caswell, Chatham, Davidson, Davie and 12 more	113 min
Apr 22, 9:34 AM EDT	Mesoscale Discussion	SPC	Beaufort, Bertie, Chowan, Cumberland, Durham, Edgecombe and 19 more	116 min
Apr 22, 10:07 AM EDT	Severe Thunderstorm Watch	SPC	Bertie, Camden, Chatham, Chowan, Cumberland, Currituck and 24 more	10 hr
Apr 22, 2:12 PM EDT	Mesoscale Discussion	SPC	Beaufort, Bertie, Camden, Chowan, Craven, Cumberland and 30 more	93 min
Apr 22, 3:19 PM EDT	Severe Thunderstorm Watch	SPC	Beaufort, Bladen, Brunswick, Carteret, Columbus, Craven and 12 more	8 hr
Apr 22, 5:38 PM EDT	Mesoscale Discussion	SPC	Bladen, Brunswick, Columbus, Duplin, Jones, New Hanover and 4 more	97 min
Apr 22, 4:54 PM EDT	Mesoscale Discussion	SPC	Beaufort, Jasper	2 hr

Nearby

Mesoscale Discussions in South Carolina, 2023 Mesoscale Discussions in North Carolina, 2023 Every mesoscale discussion in 2023

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.