Alert archive / Kentucky / Mesoscale Discussions in 2009

Mesoscale Discussion 428

April 10, 200920 counties in Kentucky

The Storm Prediction Center issued this mesoscale discussion at Apr 10, 2009, 11:30 AM EDT for 20 counties in Kentucky. It was in force for 60 min.

The area

The outline as issued.

The facts

Issued: Apr 10, 2009, 11:30 AM EDT (15:30 UTC)
Expired: Apr 10, 2009, 12:30 PM EDT
In force: 60 min
Issued by: the Storm Prediction Center

Counties Anderson County, KY, Bourbon County, KY, Boyle County, KY, Breckinridge County, KY, Bullitt County, KY, Clark County, KY, Fayette County, KY, Hancock County, KY, Hardin County, KY, Jessamine County, KY, Larue County, KY, Madison County, KY, Marion County, KY, Meade County, KY, Mercer County, KY, Nelson County, KY, Scott County, KY, Spencer County, KY, Washington County, KY, Woodford County, KY

The radar

The Louisville radar (KLVX), 65 km from the middle of the area, began a volume at 15:30 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 watches that followed

Watches SPC issued over any of the same counties within four hours of this discussion.

Tornado Watch 133Apr 10, 2:50 PM EDT

The nearest sounding before it

Cncnati-Daytn, OH (KILN), launched 12:00Z, 3.5 hours before the alert went out and 213 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: 1278 m above ground
0-6 km bulk shear: 33 kt
0-1 km storm-relative helicity: 465 m²/s²
0-3 km storm-relative helicity: 808 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 9, 11:52 PM EDT	Severe Thunderstorm Watch	SPC	Ballard, Calloway, Carlisle, Crittenden, Fulton, Graves and 5 more	4 hr
Apr 10, 1:50 AM EDT	Mesoscale Discussion	SPC	Ballard, Breckinridge, Butler, Caldwell, Calloway, Carlisle and 26 more	85 min
Apr 10, 2:22 AM EDT	Severe Thunderstorm Watch	SPC	Allen, Barren, Breckinridge, Bullitt, Butler, Caldwell and 23 more	4 hr
Apr 10, 4:33 AM EDT	Mesoscale Discussion	SPC	Adair, Allen, Barren, Breckinridge, Bullitt, Butler and 28 more	57 min
Apr 10, 9:22 AM EDT	Mesoscale Discussion	SPC	Calloway, Marshall, Todd, Trigg	83 min
Apr 10, 9:53 AM EDT	Tornado Watch	SPC	Adair, Allen, Anderson, Barren, Bourbon, Boyle and 64 more	7 hr
Apr 10, 12:14 PM EDT	Mesoscale Discussion	SPC	Allen, Calloway, Christian, Logan, Lyon, Marshall and 4 more	76 min
Apr 10, 2:26 PM EDT	Mesoscale Discussion	SPC	Adair, Allen, Anderson, Barren, Bath, Bell and 87 more	64 min
Apr 10, 2:51 PM EDT	Tornado Watch	SPC	Bath, Bell, Breathitt, Clay, Elliott, Estill and 27 more	6 hr
Apr 10, 3:56 PM EDT	Mesoscale Discussion	SPC	Breathitt, Clark, Elliott, Estill, Floyd, Jackson and 12 more	64 min
Apr 10, 4:06 PM EDT	Mesoscale Discussion	SPC	Adair, Allen, Barren, Breckinridge, Bullitt, Edmonson and 15 more	54 min
Apr 10, 4:42 PM EDT	Mesoscale Discussion	SPC	Breathitt, Clay, Elliott, Floyd, Harlan, Johnson and 14 more	63 min
Apr 10, 7:53 PM EDT	Mesoscale Discussion	SPC	Harlan, Letcher	67 min

Nearby

Mesoscale Discussions in Kentucky, 2009 Every mesoscale discussion in 2009

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.