Alert archive / Tennessee / Mesoscale Discussions in 2011

Mesoscale Discussion 614

April 27, 201118 counties in Kentucky; 21 counties in Tennessee

The Storm Prediction Center issued this mesoscale discussion at Apr 27, 2011, 4:33 AM CDT for 18 counties in Kentucky; 21 counties in Tennessee. It was in force for 57 min.

The area

The outline as issued.

The facts

Issued
Apr 27, 2011, 4:33 AM CDT (09:33 UTC)
Expired
Apr 27, 2011, 5:30 AM CDT
In force
57 min
Issued by
the Storm Prediction Center
All 39 counties

Adair County, KY, Barren County, KY, Boyle County, KY, Casey County, KY, Clinton County, KY, Cumberland County, KY, Garrard County, KY, Green County, KY, Jessamine County, KY, Lincoln County, KY, Marion County, KY, Mercer County, KY, Metcalfe County, KY, Monroe County, KY, Russell County, KY, Taylor County, KY, Washington County, KY, Wayne County, KY, Bedford County, TN, Cannon County, TN, Clay County, TN, Coffee County, TN, Cumberland County, TN, DeKalb County, TN, Fentress County, TN, Grundy County, TN, Jackson County, TN, Macon County, TN, Marshall County, TN, Overton County, TN, Pickett County, TN, Putnam County, TN, Rutherford County, TN, Smith County, TN, Trousdale County, TN, Van Buren County, TN, Warren County, TN, White County, TN, Wilson County, TN

The radar

The Nashville radar (KOHX), 97 km from the middle of the area, began a volume at 09:33 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, 9.6 hours before the alert went out and 105 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 2011-04-27Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1852 joules per kilogram.LCLEL10008507005003002001001 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 2011-04-27The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 144 square meters per square second.1939587897Sfc1 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
1852 J/kg
Mixed-layer CIN
-8 J/kg
Mixed-layer LCL
1222 m above ground
0-6 km bulk shear
47 kt
0-1 km storm-relative helicity
144 m²/s²
0-3 km storm-relative helicity
169 m²/s²
Significant tornado parameter
1.3
Supercell composite
8.9

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 26, 8:35 PM CDTMesoscale DiscussionSPCBreckinridge, Bullitt, Daviess, Hancock, Hardin, Henderson and 4 more55 min
Apr 26, 9:13 PM CDTMesoscale DiscussionSPCBallard, Caldwell, Calloway, Carlisle, Christian, Crittenden and 16 more62 min
Apr 26, 9:58 PM CDTTornado WatchSPCAdair, Allen, Anderson, Barren, Bourbon, Boyle and 49 more7 hr
Apr 27, 5:07 AM CDTTornado WatchSPCAdair, Allen, Anderson, Barren, Bourbon, Boyle and 28 more5 hr
Apr 27, 7:34 AM CDTTornado WatchSPCBath, Bell, Breathitt, Clay, Elliott, Estill and 21 more4 hr
Apr 27, 8:39 AM CDTMesoscale DiscussionSPCBoyd, Carter, Greenup, Lewis66 min
Apr 27, 12:42 PM CDTSevere Thunderstorm WatchSPCBallard, Caldwell, Calloway, Carlisle, Christian, Crittenden and 16 more5 hr
Apr 27, 2:22 PM CDTMesoscale DiscussionSPCBell, Breathitt, Clay, Floyd, Harlan, Jackson and 11 more83 min
Apr 27, 3:06 PM CDTMesoscale DiscussionSPCAllen, Ballard, Barren, Breckinridge, Butler, Caldwell and 28 more54 min
Apr 27, 3:29 PM CDTTornado WatchSPCBallard, Caldwell, Calloway, Carlisle, Christian, Crittenden and 16 more5 hr
Apr 27, 4:38 PM CDTMesoscale DiscussionSPCAdair, Allen, Anderson, Barren, Bath, Bell and 90 more37 min
Apr 27, 4:44 PM CDTTornado WatchSPCAdair, Allen, Anderson, Barren, Bath, Bell and 92 more7 hr
Apr 27, 5:27 PM CDTMesoscale DiscussionSPCCrittenden, Daviess, Henderson, Trimble, Union, Webster63 min
Apr 27, 6:22 PM CDTTornado WatchSPCBoone, Bracken, Campbell, Carroll, Gallatin, Grant and 6 more8 hr
Apr 26, 7:59 PM CDTMesoscale DiscussionSPCBedford, Cheatham, Davidson, Dickson, Giles, Hardin and 11 more2 hr
Apr 27, 2:26 AM CDTTornado WatchSPCFranklin, Lincoln, Moore6 hr
Apr 27, 6:25 AM CDTMesoscale DiscussionSPCFayette, Hardeman, Shelby, Tipton65 min
Apr 27, 8:08 AM CDTTornado WatchSPCFranklin, Lincoln, Moore6 hr
Apr 27, 10:27 AM CDTTornado WatchSPCAnderson, Bedford, Bledsoe, Blount, Bradley, Cannon and 29 more6 hr
Apr 27, 11:02 AM CDTTornado Watch PDSSPCHardin, McNairy8 hr
Apr 27, 11:39 AM CDTMesoscale DiscussionSPCBledsoe, Blount, Bradley, Cannon, Coffee, DeKalb and 16 more66 min
Apr 27, 12:08 PM CDTMesoscale DiscussionSPCBenton, Carroll, Cheatham, Chester, Crockett, Decatur and 21 more67 min
Apr 27, 1:03 PM CDTMesoscale DiscussionSPCBledsoe, Blount, Bradley, Grundy, Hamilton, Loudon and 10 more57 min
Apr 27, 1:05 PM CDTMesoscale DiscussionSPCFranklin, Giles, Lawrence, Lincoln, Marshall, Maury and 1 more85 min
Apr 27, 1:42 PM CDTTornado Watch PDSSPCFranklin, Lincoln, Moore8 hr
Apr 27, 2:56 PM CDTMesoscale DiscussionSPCFranklin, Lincoln, Marion2 hr
Apr 27, 3:36 PM CDTTornado Watch PDSSPCAnderson, Bedford, Benton, Bledsoe, Blount, Bradley and 66 more8 hr
Apr 27, 5:38 PM CDTMesoscale DiscussionSPCAnderson, Bedford, Bledsoe, Blount, Bradley, Cannon and 36 more97 min

Nearby

Mesoscale Discussions in Tennessee, 2011Mesoscale Discussions in Kentucky, 2011Every mesoscale discussion in 2011

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.