Alert archive / North Carolina / Mesoscale Discussions in 2011

Mesoscale Discussion 2064

August 27, 2011Somerset County, Wicomico County, Worcester County, Maryland; 20 counties in North Carolina; 15 counties in Virginia

The Storm Prediction Center issued this mesoscale discussion at Aug 27, 2011, 3:06 AM EDT for Somerset County, Wicomico County, Worcester County, Maryland; 20 counties in North Carolina; 15 counties in Virginia. It was in force for 114 min.

The area

The outline as issued.

The facts

Issued: Aug 27, 2011, 3:06 AM EDT (07:06 UTC)
Expired: Aug 27, 2011, 5:00 AM EDT
In force: 114 min
Issued by: the Storm Prediction Center

All 38 counties

Somerset County, MD, Wicomico County, MD, Worcester County, MD, Beaufort County, NC, Bertie County, NC, Brunswick County, NC, Camden County, NC, Carteret County, NC, Chowan County, NC, Craven County, NC, Currituck County, NC, Dare County, NC, Gates County, NC, Hyde County, NC, Jones County, NC, New Hanover County, NC, Onslow County, NC, Pamlico County, NC, Pasquotank County, NC, Pender County, NC, Perquimans County, NC, Tyrrell County, NC, Washington County, NC, Accomack County, VA, City of Chesapeake, 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, City of Virginia Beach, VA, City of Williamsburg, VA, Gloucester County, VA, Isle of Wight County, VA, Mathews County, VA, Northampton County, VA, York County, VA

The radar

The Morehead City radar (KMHX), 97 km from the middle of the area, began a volume at 07:08 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 00:00Z, 7.1 hours before the alert went out and 97 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: 148 J/kg
Mixed-layer CIN: 0 J/kg
Mixed-layer LCL: 445 m above ground
0-6 km bulk shear: 50 kt
0-1 km storm-relative helicity: 361 m²/s²
0-3 km storm-relative helicity: 415 m²/s²
Significant tornado parameter: 0.2
Supercell composite: 1.9

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
Aug 27, 12:32 AM EDT	Tornado Watch	SPC	Somerset, Wicomico, Worcester	10 hr
Aug 27, 7:52 AM EDT	Mesoscale Discussion	SPC	Somerset, Wicomico, Worcester	113 min
Aug 27, 10:31 AM EDT	Mesoscale Discussion	SPC	Somerset, Wicomico, Worcester	29 min
Aug 27, 10:41 AM EDT	Tornado Watch	SPC	Calvert, Caroline, Dorchester, Kent, Queen Anne's, Saint Mary's and 4 more	9 hr
Aug 27, 1:01 PM EDT	Mesoscale Discussion	SPC	Calvert, Caroline, Dorchester, Kent, Queen Anne's, Saint Mary's and 4 more	119 min
Aug 27, 4:44 PM EDT	Mesoscale Discussion	SPC	Somerset, Wicomico, Worcester	2 hr
Aug 27, 7:56 PM EDT	Tornado Watch	SPC	Caroline, Cecil, Kent, Queen Anne's, Talbot	9 hr
Aug 26, 8:11 PM EDT	Tornado Watch	SPC	Beaufort, Brunswick, Carteret, Craven, Dare, Hyde and 6 more	9 hr
Aug 26, 11:06 PM EDT	Mesoscale Discussion	SPC	Beaufort, Bertie, Bladen, Brunswick, Camden, Carteret and 36 more	84 min

Nearby

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