Alert archive / North Carolina / Mesoscale Discussions in 2019

Mesoscale Discussion 409

April 19, 201923 counties in North Carolina; 15 counties in Virginia

The Storm Prediction Center issued this mesoscale discussion at Apr 19, 2019, 4:35 PM EDT for 23 counties in North Carolina; 15 counties in Virginia. It was in force for 55 min.

The area

The outline as issued.

The facts

Issued
Apr 19, 2019, 4:35 PM EDT (20:35 UTC)
Expired
Apr 19, 2019, 5:30 PM EDT
In force
55 min
Issued by
the Storm Prediction Center
All 38 counties

Alamance County, NC, Caswell County, NC, Chatham County, NC, Cumberland County, NC, Durham County, NC, Edgecombe County, NC, Franklin County, NC, Granville County, NC, Guilford County, NC, Halifax County, NC, Harnett County, NC, Johnston County, NC, Lee County, NC, Nash County, NC, Northampton County, NC, Orange County, NC, Person County, NC, Rockingham County, NC, Vance County, NC, Wake County, NC, Warren County, NC, Wayne County, NC, Wilson County, NC, Appomattox County, VA, Brunswick County, VA, Campbell County, VA, Charlotte County, VA, City of Danville, VA, City of Emporia, VA, City of Lynchburg, VA, Dinwiddie County, VA, Greensville County, VA, Halifax County, VA, Lunenburg County, VA, Mecklenburg County, VA, Nottoway County, VA, Pittsylvania County, VA, Prince Edward County, VA

The radar

The Raleigh/Durham radar (KRAX), 47 km from the middle of the area, began a volume at 20:36 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

Greensboro/Hi Pt, NC (KGSO), launched 12:00Z, 8.6 hours before the alert went out and 114 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, Greensboro/Hi Pt, NC at 12:00Z on 2019-04-19Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 407 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, Greensboro/Hi Pt, NC at 12:00Z on 2019-04-19The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 228 square meters per square second.19395878Sfc1 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
407 J/kg
Mixed-layer CIN
-4 J/kg
Mixed-layer LCL
641 m above ground
0-6 km bulk shear
52 kt
0-1 km storm-relative helicity
228 m²/s²
0-3 km storm-relative helicity
250 m²/s²
Significant tornado parameter
0.5
Supercell composite
4.8

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.

IssuedProductOfficeCountiesLasted
Apr 19, 10:06 AM EDTMesoscale DiscussionSPCAlexander, Burke, Cabarrus, Caldwell, Caswell, Catawba and 19 more84 min
Apr 19, 10:31 AM EDTTornado WatchSPCAlamance, Alexander, Alleghany, Anson, Ashe, Avery and 40 more9 hr
Apr 19, 10:54 AM EDTMesoscale DiscussionSPCBladen, Brunswick, Columbus, Cumberland, Duplin, Greene and 9 more96 min
Apr 19, 12:29 PM EDTMesoscale DiscussionSPCBertie, Bladen, Brunswick, Chowan, Columbus, Craven and 27 more2 hr
Apr 19, 1:17 PM EDTTornado WatchSPCBeaufort, Bertie, Bladen, Brunswick, Camden, Carteret and 35 more11 hr
Apr 19, 1:40 PM EDTMesoscale DiscussionSPCAlamance, Alexander, Alleghany, Anson, Burke, Cabarrus and 23 more2 hr
Apr 19, 3:18 PM EDTMesoscale DiscussionSPCBertie, Bladen, Brunswick, Chatham, Columbus, Cumberland and 33 more87 min
Apr 19, 6:21 PM EDTMesoscale DiscussionSPCBeaufort, Bertie, Chowan, Craven, Gates, Halifax and 7 more84 min
Apr 19, 12:08 PM EDTMesoscale DiscussionSPCAlbemarle, Amelia, Arlington, Augusta, Buckingham, Clarke and 33 more2 hr
Apr 19, 12:48 PM EDTTornado WatchSPCAlbemarle, Arlington, Augusta, Clarke, Culpeper, Fairfax and 28 more9 hr
Apr 19, 4:32 PM EDTMesoscale DiscussionSPCAlbemarle, Arlington, Augusta, Caroline, Clarke, Culpeper and 35 more58 min

Nearby

Mesoscale Discussions in North Carolina, 2019Mesoscale Discussions in Virginia, 2019Every mesoscale discussion in 2019

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.