Alert archive / Tennessee / Mesoscale Discussions in 2018

Mesoscale Discussion 935

June 28, 20184 states

The Storm Prediction Center issued this mesoscale discussion at Jun 28, 2018, 11:00 PM CDT for 4 states. It was in force for 90 min.

The area

The outline as issued.

The facts

Issued: Jun 28, 2018, 11:00 PM CDT (04:00 UTC)
Expired: Jun 29, 2018, 12:30 AM CDT
In force: 90 min
Issued by: the Storm Prediction Center

All 25 counties

Clay County, AR, Craighead County, AR, Crittenden County, AR, Cross County, AR, Greene County, AR, Mississippi County, AR, Poinsett County, AR, Dunklin County, MO, Alcorn County, MS, Benton County, MS, DeSoto County, MS, Marshall County, MS, Tippah County, MS, Chester County, TN, Crockett County, TN, Fayette County, TN, Hardeman County, TN, Hardin County, TN, Haywood County, TN, Henderson County, TN, Lauderdale County, TN, Madison County, TN, McNairy County, TN, Shelby County, TN, Tipton County, TN

The radar

The Memphis radar (KNQA), 13 km from the middle of the area, began a volume at 04:01 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

Little Rock, AR (KBYH), launched 00:00Z, 4.0 hours before the alert went out and 65 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: 2733 J/kg
Mixed-layer CIN: -27 J/kg
Mixed-layer LCL: 1855 m above ground
0-6 km bulk shear: 12 kt
0-1 km storm-relative helicity: -21 m²/s²
0-3 km storm-relative helicity: -8 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

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
Jun 28, 8:39 PM CDT	Mesoscale Discussion	SPC	Crittenden	96 min
Jun 28, 7:01 PM CDT	Mesoscale Discussion	SPC	Clarke, George, Greene, Jackson, Jasper, Jones and 4 more	89 min
Jun 28, 7:30 PM CDT	Mesoscale Discussion	SPC	Bollinger, Cape Girardeau, Madison, Mississippi, New Madrid, Pemiscot and 5 more	90 min
Jun 28, 8:55 PM CDT	Severe Thunderstorm Watch	SPC	Benton, Carroll, Cheatham, Chester, Crockett, Decatur and 21 more	4 hr

Nearby

Mesoscale Discussions in Tennessee, 2018 Mesoscale Discussions in Arkansas, 2018 Mesoscale Discussions in Mississippi, 2018 Every mesoscale discussion in 2018

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.