Alert archive / Mississippi / Mesoscale Discussions in 2017

Mesoscale Discussion 569

April 26, 2017Covington County, Jones County, Mississippi

The Storm Prediction Center issued this mesoscale discussion at Apr 26, 2017, 11:57 PM CDT for Covington County, Jones County, Mississippi. It was in force for 93 min.

The area

The outline as issued.

The facts

Issued: Apr 26, 2017, 11:57 PM CDT (04:57 UTC)
Expired: Apr 27, 2017, 1:30 AM CDT
In force: 93 min
Issued by: the Storm Prediction Center

Counties Covington County, MS, Jones County, MS

The radar

The Jackson/Brandon,MS radar (KDGX), 93 km from the middle of the area, began a volume at 04:57 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

Jackson, MS (KJAN), launched 00:00Z, 5.0 hours before the alert went out and 102 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: 448 J/kg
Mixed-layer CIN: -135 J/kg
Mixed-layer LCL: 1294 m above ground
0-6 km bulk shear: 55 kt
0-1 km storm-relative helicity: 113 m²/s²
0-3 km storm-relative helicity: 161 m²/s²
Significant tornado parameter: 0.1
Supercell composite: 2.1

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
Apr 26, 7:02 PM CDT	Mesoscale Discussion	SPC	Adams, Attala, Carroll, Claiborne, Copiah, Franklin and 14 more	88 min
Apr 26, 7:36 PM CDT	Mesoscale Discussion	SPC	Alcorn, Benton, Calhoun, Chickasaw, Clay, Grenada and 12 more	84 min
Apr 26, 9:01 PM CDT	Severe Thunderstorm Watch	SPC	Adams, Attala, Choctaw, Claiborne, Clarke, Clay and 29 more	5 hr
Apr 27, 1:36 AM CDT	Mesoscale Discussion	SPC	Clarke, Forrest, Greene, Jasper, Jones, Lauderdale and 2 more	114 min

Nearby

Mesoscale Discussions in Mississippi, 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.