Alert archive / North Carolina / Mesoscale Discussions in 2011

Mesoscale Discussion 462

April 16, 201134 counties in North Carolina; Charleston County, Georgetown County, Horry County, South Carolina; 15 counties in Virginia

The Storm Prediction Center issued this mesoscale discussion at Apr 16, 2011, 6:59 PM EDT for 34 counties in North Carolina; Charleston County, Georgetown County, Horry County, South Carolina; 15 counties in Virginia. It was in force for 91 min.

The area

The outline as issued.

The facts

Issued
Apr 16, 2011, 6:59 PM EDT (22:59 UTC)
Expired
Apr 16, 2011, 8:30 PM EDT
In force
91 min
Issued by
the Storm Prediction Center
All 52 counties

Beaufort County, NC, Bertie County, NC, Bladen County, NC, Brunswick County, NC, Camden County, NC, Carteret County, NC, Chowan County, NC, Columbus County, NC, Craven County, NC, Currituck County, NC, Dare County, NC, Duplin County, NC, Edgecombe County, NC, Gates County, NC, Greene County, NC, Halifax County, NC, Hertford County, NC, Hyde County, NC, Jones County, NC, Lenoir County, NC, Martin County, NC, New Hanover County, NC, Northampton 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, Charleston County, SC, Georgetown County, SC, Horry County, SC, City of Chesapeake, VA, City of Emporia, VA, City of Franklin, VA, City of Hampton, VA, City of Newport News, VA, City of Norfolk, VA, City of Poquoson, VA, City of Portsmouth, VA, City of Suffolk, VA, Greensville County, VA, Isle of Wight County, VA, Prince George County, VA, Southampton County, VA, Surry County, VA, Sussex County, VA

The radar

The Morehead City radar (KMHX), 90 km from the middle of the area, began a volume at 23:01 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, 11.0 hours before the alert went out and 90 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-pSkew-T log-p diagram, Newport, NC at 12:00Z on 2011-04-16Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 7 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Newport, NC at 12:00Z on 2011-04-16The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 201 square meters per square second.193958Sfc1 km3 km6 km9 kmRMLM
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
7 J/kg
Mixed-layer CIN
-6 J/kg
Mixed-layer LCL
824 m above ground
0-6 km bulk shear
47 kt
0-1 km storm-relative helicity
201 m²/s²
0-3 km storm-relative helicity
308 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.

IssuedProductOfficeCountiesLasted
Apr 16, 5:57 AM EDTTornado WatchSPCAlexander, Cabarrus, Catawba, Cleveland, Davie, Gaston and 9 more8 hr
Apr 16, 10:39 AM EDTMesoscale DiscussionSPCAlamance, Anson, Bertie, Bladen, Brunswick, Cabarrus and 52 more2 hr
Apr 16, 12:02 PM EDTTornado Watch PDSSPCAlamance, Anson, Beaufort, Bertie, Bladen, Brunswick and 60 more11 hr
Apr 16, 12:16 PM EDTMesoscale DiscussionSPCBeaufort, Bertie, Bladen, Brunswick, Chowan, Columbus and 25 more59 min
Apr 16, 2:28 PM EDTMesoscale DiscussionSPCAlamance, Beaufort, Bertie, Bladen, Brunswick, Camden and 49 more92 min
Apr 16, 4:49 PM EDTMesoscale DiscussionSPCBeaufort, Bertie, Bladen, Brunswick, Camden, Carteret and 34 more86 min
Apr 16, 5:09 AM EDTMesoscale DiscussionSPCAbbeville, Aiken, Anderson, Chester, Edgefield, Fairfield and 10 more96 min
Apr 16, 12:52 PM EDTMesoscale DiscussionSPCAccomack, Albemarle, Amherst, Arlington, Augusta, Botetourt and 51 more113 min
Apr 16, 1:29 PM EDTTornado WatchSPCAlbemarle, Arlington, Augusta, Clarke, Culpeper, Fairfax and 28 more8 hr
Apr 16, 4:29 PM EDTMesoscale DiscussionSPCArlington, Clarke, Culpeper, Fairfax, Fauquier, Frederick and 20 more31 min
Apr 16, 6:38 PM EDTMesoscale DiscussionSPCAlbemarle, Arlington, Augusta, Clarke, Culpeper, Fairfax and 28 more97 min

Nearby

Mesoscale Discussions in North Carolina, 2011Mesoscale Discussions in Virginia, 2011Mesoscale Discussions in South Carolina, 2011Every 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.