Alert archive / Tennessee / Mesoscale Discussions in 2011

Mesoscale Discussion 350

April 4, 20117 states

The Storm Prediction Center issued this mesoscale discussion at Apr 4, 2011, 4:49 PM EDT for 7 states. It was in force for 56 min.

The area

The outline as issued.

The facts

Issued
Apr 4, 2011, 4:49 PM EDT (20:49 UTC)
Expired
Apr 4, 2011, 5:45 PM EDT
In force
56 min
Issued by
the Storm Prediction Center
All 98 counties

Catoosa County, GA, Dade County, GA, Fannin County, GA, Gilmer County, GA, Gordon County, GA, Murray County, GA, Towns County, GA, Union County, GA, Walker County, GA, Whitfield County, GA, Bell County, KY, Boyd County, KY, Breathitt County, KY, Carter County, KY, Clay County, KY, Elliott County, KY, Floyd County, KY, Harlan County, KY, Jackson County, KY, Johnson County, KY, Knott County, KY, Knox County, KY, Laurel County, KY, Lawrence County, KY, Lee County, KY, Leslie County, KY, Letcher County, KY, Magoffin County, KY, Martin County, KY, McCreary County, KY, Menifee County, KY, Morgan County, KY, Owsley County, KY, Perry County, KY, Pike County, KY, Whitley County, KY, Wolfe County, KY, Cherokee County, NC, Clay County, NC, Graham County, NC, Haywood County, NC, Jackson County, NC, Macon County, NC, Madison County, NC, Swain County, NC, Lawrence County, OH, Anderson County, TN, Bledsoe County, TN, Blount County, TN, Bradley County, TN, Campbell County, TN, Claiborne County, TN, Cocke County, TN, Cumberland County, TN, Fentress County, TN, Grainger County, TN, Greene County, TN, Grundy County, TN, Hamblen County, TN, Hamilton County, TN, Hancock County, TN, Hawkins County, TN, Jefferson County, TN, Knox County, TN, Loudon County, TN, Marion County, TN, McMinn County, TN, Meigs County, TN, Monroe County, TN, Morgan County, TN, Polk County, TN, Rhea County, TN, Roane County, TN, Scott County, TN, Sequatchie County, TN, Sevier County, TN, Sullivan County, TN, Union County, TN, Van Buren County, TN, Washington County, TN, Buchanan County, VA, City of Bristol, VA, City of Norton, VA, Dickenson County, VA, Lee County, VA, Russell County, VA, Scott County, VA, Wise County, VA, Boone County, WV, Cabell County, WV, Kanawha County, WV, Lincoln County, WV, Logan County, WV, McDowell County, WV, Mingo County, WV, Putnam County, WV, Wayne County, WV, Wyoming County, WV

The radar

The Knoxville radar (KMRX), 65 km from the middle of the area, began a volume at 20:52 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, 8.8 hours before the alert went out and 269 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 2011-04-04Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 68 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 2011-04-04The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 370 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
68 J/kg
Mixed-layer CIN
-640 J/kg
Mixed-layer LCL
855 m above ground
0-6 km bulk shear
38 kt
0-1 km storm-relative helicity
370 m²/s²
0-3 km storm-relative helicity
507 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.

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SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Apr 4, 5:28 PM EDTMesoscale DiscussionSPCBartow, Butts, Carroll, Cherokee, Clayton, Cobb and 23 more62 min
Apr 4, 5:55 PM EDTTornado WatchSPCBanks, Barrow, Bartow, Carroll, Catoosa, Chattooga and 32 more6 hr
Apr 4, 7:50 PM EDTMesoscale DiscussionSPCBartow, Carroll, Chattooga, Clayton, Cobb, Coweta and 10 more85 min
Apr 4, 5:30 AM EDTSevere Thunderstorm WatchSPCBoone, Campbell, Kenton8 hr
Apr 4, 7:53 AM EDTMesoscale DiscussionSPCBoone, Breckinridge, Caldwell, Carroll, Crittenden, Daviess and 16 more2 hr
Apr 4, 8:22 AM EDTTornado WatchSPCBallard, Breckinridge, Butler, Caldwell, Calloway, Carlisle and 24 more7 hr
Apr 4, 12:34 PM EDTTornado WatchSPCAdair, Allen, Anderson, Barren, Bourbon, Boyle and 43 more5 hr
Apr 4, 12:50 PM EDTMesoscale DiscussionSPCBoone, Campbell, Kenton25 min
Apr 4, 2:25 PM EDTMesoscale DiscussionSPCAdair, Allen, Anderson, Barren, Bath, Bell and 74 more65 min
Apr 4, 3:05 PM EDTSevere Thunderstorm WatchSPCBath, Bell, Boyd, Breathitt, Carter, Clay and 33 more6 hr
Apr 4, 3:08 PM EDTMesoscale DiscussionSPCAllen, Clinton, Cumberland, McCreary, Monroe, Russell and 2 more67 min
Apr 4, 6:00 PM EDTMesoscale DiscussionSPCBell, Boyd, Breathitt, Clay, Floyd, Harlan and 12 more90 min
Apr 4, 5:20 AM EDTMesoscale DiscussionSPCAllen, Auglaize, Butler, Champaign, Crawford, Darke and 21 more25 min
Apr 4, 4:12 PM EDTMesoscale DiscussionSPCAthens, Belmont, Carroll, Columbiana, Coshocton, Guernsey and 12 more63 min
Apr 4, 11:25 AM EDTMesoscale DiscussionSPCBedford, Cannon, Cheatham, Davidson, Decatur, Dickson and 19 more2 hr
Apr 4, 2:03 PM EDTTornado WatchSPCFranklin, Lincoln, Moore7 hr

Nearby

Mesoscale Discussions in Tennessee, 2011Mesoscale Discussions in Kentucky, 2011Mesoscale Discussions in Georgia, 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.