Alert archive / Kentucky / Mesoscale Discussions in 2014

Mesoscale Discussion 477

April 29, 201423 counties in Kentucky; 14 counties in Tennessee

The Storm Prediction Center issued this mesoscale discussion at Apr 29, 2014, 2:10 PM CDT for 23 counties in Kentucky; 14 counties in Tennessee. It was in force for 65 min.

The area

The outline as issued.

The facts

Issued: Apr 29, 2014, 2:10 PM CDT (19:10 UTC)
Expired: Apr 29, 2014, 3:15 PM CDT
In force: 65 min
Issued by: the Storm Prediction Center
Chance of a watch: 20%

All 37 counties

Adair County, KY, Allen County, KY, Barren County, KY, Butler County, KY, Casey County, KY, Clinton County, KY, Cumberland County, KY, Edmonson County, KY, Grayson County, KY, Green County, KY, Hardin County, KY, Hart County, KY, Larue County, KY, Logan County, KY, Marion County, KY, Metcalfe County, KY, Monroe County, KY, Nelson County, KY, Russell County, KY, Simpson County, KY, Taylor County, KY, Warren County, KY, Washington County, KY, Cannon County, TN, Cheatham County, TN, Clay County, TN, Davidson County, TN, DeKalb County, TN, Jackson County, TN, Macon County, TN, Robertson County, TN, Rutherford County, TN, Smith County, TN, Sumner County, TN, Trousdale County, TN, Williamson County, TN, Wilson County, TN

The radar

The Nashville radar (KOHX), 67 km from the middle of the area, began a volume at 19:09 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

Nashville Metro, TN (KBNA), launched 12:00Z, 7.2 hours before the alert went out and 80 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 1906 m above ground
0-6 km bulk shear: 82 kt
0-1 km storm-relative helicity: 13 m²/s²
0-3 km storm-relative helicity: 76 m²/s²
Significant tornado parameter: 0.0
Supercell composite: -0.0

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

<!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 29, 2:58 PM CDT	Mesoscale Discussion	SPC	Boyd, Carter, Elliott, Greenup, Lawrence, Martin	92 min
Apr 28, 7:12 PM CDT	Mesoscale Discussion	SPC	Coffee, Franklin, Giles, Grundy, Hamilton, Lawrence and 7 more	93 min
Apr 28, 7:59 PM CDT	Tornado Watch	SPC	Franklin, Lincoln, Moore	11 hr
Apr 28, 9:10 PM CDT	Mesoscale Discussion	SPC	Anderson, Campbell, Claiborne, Grainger, Morgan, Scott and 1 more	65 min
Apr 28, 9:34 PM CDT	Mesoscale Discussion	SPC	Bradley, Hamilton, McMinn, Marion, Meigs, Monroe and 2 more	86 min
Apr 28, 11:20 PM CDT	Mesoscale Discussion	SPC	Blount, Bradley, Cocke, Hamilton, Loudon, McMinn and 3 more	85 min
Apr 28, 11:30 PM CDT	Tornado Watch	SPC	Blount, Bradley, Cocke, Grainger, Greene, Hamblen and 10 more	7 hr
Apr 29, 3:27 PM CDT	Mesoscale Discussion	SPC	Franklin, Giles, Lincoln, Marion, Moore	33 min
Apr 29, 3:56 PM CDT	Tornado Watch	SPC	Franklin, Lincoln, Moore	4 hr
Apr 29, 6:55 PM CDT	Mesoscale Discussion	SPC	Lincoln, Moore	95 min

Nearby

Mesoscale Discussions in Kentucky, 2014 Mesoscale Discussions in Tennessee, 2014 Every mesoscale discussion in 2014

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.