Alert archive / North Carolina / Mesoscale Discussions in 2014

Mesoscale Discussion 480

April 29, 201433 counties in North Carolina

The Storm Prediction Center issued this mesoscale discussion at Apr 29, 2014, 4:38 PM EDT for 33 counties in North Carolina. It was in force for 97 min.

The area

The outline as issued.

The facts

Issued: Apr 29, 2014, 4:38 PM EDT (20:38 UTC)
Expired: Apr 29, 2014, 6:15 PM EDT
In force: 97 min
Issued by: the Storm Prediction Center

All 33 counties

Beaufort County, NC, Bertie County, NC, Bladen County, NC, Camden County, NC, Carteret County, NC, Chowan County, NC, Craven County, NC, Cumberland County, NC, Dare County, NC, Duplin County, NC, Edgecombe County, NC, Gates County, NC, Greene County, NC, Halifax County, NC, Harnett County, NC, Hertford County, NC, Hyde County, NC, Johnston County, NC, Jones County, NC, Lenoir County, NC, Martin County, NC, Nash County, NC, Onslow County, NC, Pamlico County, NC, Pasquotank County, NC, Pender County, NC, Perquimans County, NC, Pitt County, NC, Sampson County, NC, Tyrrell County, NC, Washington County, NC, Wayne County, NC, Wilson County, NC

The radar

The Morehead City radar (KMHX), 62 km from the middle of the area, began a volume at 20:41 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

Newport, NC (KMHX), launched 12:00Z, 8.6 hours before the alert went out and 61 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: 1802 J/kg
Mixed-layer CIN: -9 J/kg
Mixed-layer LCL: 561 m above ground
0-6 km bulk shear: 19 kt
0-1 km storm-relative helicity: 76 m²/s²
0-3 km storm-relative helicity: 76 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

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
Apr 28, 10:34 PM EDT	Mesoscale Discussion	SPC	Cherokee, Graham	86 min
Apr 28, 11:29 PM EDT	Mesoscale Discussion	SPC	Buncombe, Clay, Haywood, Henderson, Jackson, Macon and 2 more	61 min
Apr 29, 12:20 AM EDT	Mesoscale Discussion	SPC	Cherokee, Clay, Graham, Haywood, Jackson, Macon and 1 more	85 min
Apr 29, 12:30 AM EDT	Tornado Watch	SPC	Buncombe, Cherokee, Clay, Graham, Haywood, Henderson and 10 more	7 hr
Apr 29, 1:26 PM EDT	Mesoscale Discussion	SPC	Alamance, Anson, Bladen, Cabarrus, Caswell, Catawba and 40 more	94 min
Apr 29, 2:27 PM EDT	Tornado Watch	SPC	Anson, Beaufort, Bertie, Carteret, Chatham, Chowan and 38 more	8 hr
Apr 29, 7:22 PM EDT	Mesoscale Discussion	SPC	Beaufort, Bertie, Carteret, Chowan, Craven, Cumberland and 26 more	53 min

Nearby

Mesoscale Discussions in North Carolina, 2014 Every mesoscale discussion in 2014

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.