Alert archive / Tennessee / Mesoscale Discussions in 2014

Mesoscale Discussion 452

April 28, 2014Clinton County, McCreary County, Wayne County, Kentucky; 39 counties in Tennessee

The Storm Prediction Center issued this mesoscale discussion at Apr 28, 2014, 12:50 PM CDT for Clinton County, McCreary County, Wayne County, Kentucky; 39 counties in Tennessee. It was in force for 55 min.

The area

The outline as issued.

The facts

Issued
Apr 28, 2014, 12:50 PM CDT (17:50 UTC)
Expired
Apr 28, 2014, 1:45 PM CDT
In force
55 min
Issued by
the Storm Prediction Center
Chance of a watch
60%
All 42 counties

Clinton County, KY, McCreary County, KY, Wayne County, KY, Anderson County, TN, Bedford County, TN, Bledsoe County, TN, Bradley County, TN, Campbell County, TN, Cannon County, TN, Clay County, TN, Coffee County, TN, Cumberland County, TN, DeKalb County, TN, Fentress County, TN, Franklin County, TN, Giles County, TN, Grundy County, TN, Hamilton County, TN, Jackson County, TN, Knox County, TN, Lawrence County, TN, Lincoln County, TN, Loudon County, TN, Marion County, TN, Marshall County, TN, McMinn County, TN, Meigs County, TN, Moore County, TN, Morgan County, TN, Overton County, TN, Pickett County, TN, Putnam County, TN, Rhea County, TN, Roane County, TN, Rutherford County, TN, Scott County, TN, Sequatchie County, TN, Smith County, TN, Union County, TN, Van Buren County, TN, Warren County, TN, White County, TN

The radar

The Nashville radar (KOHX), 128 km from the middle of the area, began a volume at 17:50 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 12:00Z, 5.8 hours before the alert went out and 128 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 12:00Z on 2014-04-28Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 267 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 12:00Z on 2014-04-28The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 573 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
267 J/kg
Mixed-layer CIN
-224 J/kg
Mixed-layer LCL
707 m above ground
0-6 km bulk shear
51 kt
0-1 km storm-relative helicity
573 m²/s²
0-3 km storm-relative helicity
616 m²/s²
Significant tornado parameter
0.0
Supercell composite
14.5

Open this sounding in Storm Lab

The text

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

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SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Apr 27, 7:29 PM CDTMesoscale DiscussionSPCCarlisle, Fulton, Hickman91 min
Apr 27, 7:53 PM CDTTornado WatchSPCBallard, Caldwell, Calloway, Carlisle, Christian, Crittenden and 16 more6 hr
Apr 27, 11:41 PM CDTMesoscale DiscussionSPCBallard, Carlisle, Crittenden, Fulton, Graves, Hickman and 5 more94 min
Apr 28, 4:30 AM CDTMesoscale DiscussionSPCAdair, Allen, Anderson, Barren, Bath, Bourbon and 61 more90 min
Apr 28, 6:57 AM CDTMesoscale DiscussionSPCCalloway, Christian, Logan, Simpson, Todd, Trigg2 hr
Apr 28, 1:33 PM CDTTornado WatchSPCBell, Clay, Floyd, Harlan, Knott, Knox and 5 more5 hr
Apr 28, 3:12 PM CDTMesoscale DiscussionSPCHarlan, Letcher, Pike63 min
Apr 28, 3:13 PM CDTMesoscale DiscussionSPCAdair, Allen, Ballard, Barren, Breckinridge, Bullitt and 43 more2 hr
Apr 28, 6:10 PM CDTMesoscale DiscussionSPCBallard, Caldwell, Christian, Crittenden, Graves, Henderson and 9 more95 min
Apr 28, 1:43 AM CDTTornado WatchSPCBenton, Carroll, Chester, Crockett, Decatur, Dyer and 15 more8 hr
Apr 28, 12:05 PM CDTMesoscale DiscussionSPCBedford, Giles, Hardin, Lawrence, Lewis, Lincoln and 5 more115 min
Apr 28, 12:39 PM CDTTornado Watch PDSSPCBedford, Chester, Coffee, Decatur, Franklin, Giles and 13 more8 hr
Apr 28, 2:09 PM CDTMesoscale DiscussionSPCGiles, Hardin, Lawrence, Lincoln, Wayne66 min
Apr 28, 5:22 PM CDTMesoscale DiscussionSPCBradley, Coffee, Franklin, Giles, Grundy, Hamilton and 8 more83 min
Apr 28, 5:37 PM CDTTornado Watch PDSSPCAnderson, Bledsoe, Blount, Bradley, Campbell, Claiborne and 25 more6 hr

Nearby

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