Alert archive / North Carolina / Mesoscale Discussions in 2017

Mesoscale Discussion 836

May 24, 201721 counties in North Carolina; 15 counties in Virginia

The Storm Prediction Center issued this mesoscale discussion at May 24, 2017, 6:59 PM EDT for 21 counties in North Carolina; 15 counties in Virginia. It was in force for 91 min.

The area

The outline as issued.

The facts

Issued: May 24, 2017, 6:59 PM EDT (22:59 UTC)
Expired: May 24, 2017, 8:30 PM EDT
In force: 91 min
Issued by: the Storm Prediction Center

All 36 counties

Bertie County, NC, Camden County, NC, Chowan County, NC, Currituck County, NC, Edgecombe County, NC, Franklin County, NC, Gates County, NC, Granville County, NC, Halifax County, NC, Hertford County, NC, Martin County, NC, Nash County, NC, Northampton County, NC, Pasquotank County, NC, Perquimans County, NC, Person County, NC, Pitt County, NC, Tyrrell County, NC, Vance County, NC, Warren County, NC, Washington County, NC, Brunswick County, VA, Charlotte County, VA, City of Chesapeake, VA, City of Emporia, VA, City of Franklin, VA, City of Portsmouth, VA, City of Suffolk, VA, Dinwiddie County, VA, Greensville County, VA, Halifax County, VA, Isle of Wight County, VA, Lunenburg County, VA, Mecklenburg County, VA, Southampton County, VA, Sussex County, VA

The radar

The Norfolk radar (KAKQ), 89 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 185 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: 13 J/kg
Mixed-layer CIN: -167 J/kg
Mixed-layer LCL: 779 m above ground
0-6 km bulk shear: 56 kt
0-1 km storm-relative helicity: 6 m²/s²
0-3 km storm-relative helicity: 56 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 24, 7:41 AM EDT	Mesoscale Discussion	SPC	Cherokee, Graham	3 hr
May 24, 10:04 AM EDT	Tornado Watch	SPC	Alexander, Avery, Buncombe, Burke, Cabarrus, Caldwell and 24 more	11 hr
May 24, 1:19 PM EDT	Tornado Watch	SPC	Cherokee	7 hr
May 24, 3:02 PM EDT	Mesoscale Discussion	SPC	Alexander, Buncombe, Burke, Cabarrus, Caldwell, Catawba and 21 more	88 min
May 24, 3:13 PM EDT	Mesoscale Discussion	SPC	Alamance, Alleghany, Bladen, Brunswick, Caswell, Chatham and 37 more	2 hr
May 24, 3:46 PM EDT	Tornado Watch	SPC	Alamance, Alleghany, Anson, Ashe, Beaufort, Bladen and 52 more	6 hr
May 24, 3:50 PM EDT	Mesoscale Discussion	SPC	Cherokee, Graham, Swain	55 min
May 24, 5:25 PM EDT	Mesoscale Discussion	SPC	Alexander, Buncombe, Burke, Cabarrus, Caldwell, Catawba and 16 more	65 min
May 24, 6:51 PM EDT	Mesoscale Discussion	SPC	Dickenson, Scott, Wise, City of Bristol, City of Norton	24 min

Nearby

Mesoscale Discussions in North Carolina, 2017 Mesoscale Discussions in Virginia, 2017 Every mesoscale discussion in 2017

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.