Alert archive / Kentucky / Mesoscale Discussions in 2014

Mesoscale Discussion 277

April 4, 20144 states

The Storm Prediction Center issued this mesoscale discussion at Apr 4, 2014, 2:39 AM EDT for 4 states. It was in force for 3 hr.

The area

The outline as issued.

The facts

Issued
Apr 4, 2014, 2:39 AM EDT (06:39 UTC)
Expired
Apr 4, 2014, 5:15 AM EDT
In force
3 hr
Issued by
the Storm Prediction Center
Chance of a watch
60%
All 97 counties

Clark County, IN, Crawford County, IN, Dearborn County, IN, Decatur County, IN, Floyd County, IN, Franklin County, IN, Harrison County, IN, Jackson County, IN, Jefferson County, IN, Jennings County, IN, Ohio County, IN, Orange County, IN, Perry County, IN, Ripley County, IN, Scott County, IN, Switzerland County, IN, Union County, IN, Washington County, IN, Adair County, KY, Allen County, KY, Anderson County, KY, Barren County, KY, Boone County, KY, Bourbon County, KY, Boyle County, KY, Bracken County, KY, Breckinridge County, KY, Bullitt County, KY, Butler County, KY, Campbell County, KY, Carroll County, KY, Casey County, KY, Cumberland County, KY, Edmonson County, KY, Fayette County, KY, Franklin County, KY, Gallatin County, KY, Garrard County, KY, Grant County, KY, Grayson County, KY, Green County, KY, Hancock County, KY, Hardin County, KY, Harrison County, KY, Hart County, KY, Henry County, KY, Jefferson County, KY, Jessamine County, KY, Kenton County, KY, Larue County, KY, Lincoln County, KY, Logan County, KY, Marion County, KY, Mason County, KY, Meade County, KY, Mercer County, KY, Metcalfe County, KY, Monroe County, KY, Muhlenberg County, KY, Nelson County, KY, Nicholas County, KY, Ohio County, KY, Oldham County, KY, Owen County, KY, Pendleton County, KY, Robertson County, KY, Scott County, KY, Shelby County, KY, Simpson County, KY, Spencer County, KY, Taylor County, KY, Todd County, KY, Trimble County, KY, Warren County, KY, Washington County, KY, Woodford County, KY, Brown County, OH, Butler County, OH, Clermont County, OH, Clinton County, OH, Greene County, OH, Hamilton County, OH, Highland County, OH, Montgomery County, OH, Warren County, OH, Cheatham County, TN, Davidson County, TN, Dickson County, TN, Houston County, TN, Humphreys County, TN, Macon County, TN, Montgomery County, TN, Robertson County, TN, Sumner County, TN, Trousdale County, TN, Williamson County, TN, Wilson County, TN

The radar

The Louisville radar (KLVX), 22 km from the middle of the area, began a volume at 06:41 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.

The nearest sounding before it

Nashville Metro, TN (KBNA), launched 00:00Z, 6.7 hours before the alert went out and 192 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-pSkew-T log-p diagram, Nashville Metro, TN at 00:00Z on 2014-04-04Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 999 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Nashville Metro, TN at 00:00Z on 2014-04-04The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 236 square meters per square second.19395878Sfc1 km3 km6 km9 kmRMLM
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
999 J/kg
Mixed-layer CIN
-31 J/kg
Mixed-layer LCL
1348 m above ground
0-6 km bulk shear
56 kt
0-1 km storm-relative helicity
236 m²/s²
0-3 km storm-relative helicity
289 m²/s²
Significant tornado parameter
1.1
Supercell composite
6.8

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.

IssuedProductOfficeCountiesLasted
Apr 3, 9:30 PM EDTTornado WatchSPCPosey, Spencer, Vanderburgh, Warrick7 hr
Apr 4, 12:40 AM EDTMesoscale DiscussionSPCPosey, Spencer, Vanderburgh, Warrick95 min
Apr 3, 9:16 PM EDTMesoscale DiscussionSPCBallard, Caldwell, Calloway, Carlisle, Crittenden, Fulton and 11 more59 min
Apr 4, 3:12 AM EDTMesoscale DiscussionSPCCaldwell, Calloway, Christian, Hopkins, Lyon, McLean and 3 more63 min
Apr 4, 5:42 AM EDTMesoscale DiscussionSPCAdair, Casey, Clay, Clinton, Cumberland, Jackson and 12 more93 min
Apr 4, 5:58 AM EDTSevere Thunderstorm WatchSPCAdair, Bell, Breathitt, Casey, Clay, Clinton and 30 more5 hr
Apr 4, 8:41 AM EDTMesoscale DiscussionSPCBell, Breathitt, Clay, Floyd, Harlan, Jackson and 14 more49 min
Apr 4, 5:54 PM EDTMesoscale DiscussionSPCBelmont, Columbiana, Harrison, Jefferson, Mahoning, Monroe and 1 more96 min
Apr 3, 11:45 PM EDTMesoscale DiscussionSPCChester, Fayette, Hardeman, Haywood, Madison, Shelby and 1 more60 min
Apr 4, 1:40 AM EDTTornado WatchSPCChester, Decatur, Fayette, Hardeman, Hardin, Haywood and 5 more5 hr
Apr 4, 3:29 AM EDTMesoscale DiscussionSPCDecatur, Giles, Hardin, Lawrence, Lewis, Marshall and 3 more31 min
Apr 4, 3:52 AM EDTTornado WatchSPCBedford, Cannon, Cheatham, Clay, Coffee, Cumberland and 30 more5 hr
Apr 4, 4:45 AM EDTMesoscale DiscussionSPCChester, Hardeman, Hardin, Henderson, McNairy60 min
Apr 4, 6:28 AM EDTMesoscale DiscussionSPCBedford, Cannon, Coffee, Cumberland, Davidson, DeKalb and 21 more92 min
Apr 4, 8:00 AM EDTMesoscale DiscussionSPCBlount, Cocke, Greene, Jefferson, Monroe, Polk and 1 more90 min

Nearby

Mesoscale Discussions in Kentucky, 2014Mesoscale Discussions in Indiana, 2014Mesoscale Discussions in Tennessee, 2014Every 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.