Alert archive / Missouri / Mesoscale Discussions in 2017

Mesoscale Discussion 1054

June 16, 20174 states

The Storm Prediction Center issued this mesoscale discussion at Jun 16, 2017, 12:45 PM CDT for 4 states. It was in force for 3 hr.

The area

The outline as issued.

The facts

Issued: Jun 16, 2017, 12:45 PM CDT (17:45 UTC)
Expired: Jun 16, 2017, 3:15 PM CDT
In force: 3 hr
Issued by: the Storm Prediction Center
Chance of a watch: 20%

All 31 counties

Alexander County, IL, Jackson County, IL, Johnson County, IL, Massac County, IL, Perry County, IL, Pulaski County, IL, Randolph County, IL, Union County, IL, Williamson County, IL, Ballard County, KY, Carlisle County, KY, Fulton County, KY, Hickman County, KY, McCracken County, KY, Bollinger County, MO, Cape Girardeau County, MO, Madison County, MO, Mississippi County, MO, New Madrid County, MO, Pemiscot County, MO, Perry County, MO, Saint Francois County, MO, Sainte Genevieve County, MO, Scott County, MO, Stoddard County, MO, Crockett County, TN, Dyer County, TN, Gibson County, TN, Lake County, TN, Obion County, TN, Weakley County, TN

The radar

The Paducah radar (KPAH), 69 km from the middle of the area, began a volume at 17:48 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 12:00Z, 5.8 hours before the alert went out and 224 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: 800 J/kg
Mixed-layer CIN: -305 J/kg
Mixed-layer LCL: 1569 m above ground
0-6 km bulk shear: 24 kt
0-1 km storm-relative helicity: -6 m²/s²
0-3 km storm-relative helicity: 24 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
Jun 16, 6:56 PM CDT	Mesoscale Discussion	SPC	Carroll, Jo Daviess, Stephenson	64 min
Jun 15, 7:07 PM CDT	Severe Thunderstorm Watch	SPC	Barry, Barton, Bates, Cass, Cedar, Clay and 13 more	6 hr
Jun 16, 6:16 PM CDT	Mesoscale Discussion	SPC	Andrew, Atchison, Buchanan, DeKalb, Gentry, Holt and 2 more	119 min
Jun 16, 12:42 PM CDT	Severe Thunderstorm Watch	SPC	Fayette, Hardeman, Hardin, McNairy, Shelby, Tipton	10 hr
Jun 16, 3:40 PM CDT	Mesoscale Discussion	SPC	Fayette	2 hr

Nearby

Mesoscale Discussions in Missouri, 2017 Mesoscale Discussions in Illinois, 2017 Mesoscale Discussions in Tennessee, 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.