Alert archive / Tennessee / Tornado Watches in 2006

Tornado Watch 234

April 21, 200618 counties in Georgia; Cherokee County, Clay County, North Carolina; 23 counties in Tennessee

The Storm Prediction Center issued this tornado watch at Apr 21, 2006, 4:33 PM EDT for 18 counties in Georgia; Cherokee County, Clay County, North Carolina; 23 counties in Tennessee. It was in force for 6 hr.

The area

The outline as issued.

The facts

Issued
Apr 21, 2006, 4:33 PM EDT (20:33 UTC)
Expired
Apr 21, 2006, 11:00 PM EDT
In force
6 hr
Issued by
the Storm Prediction Center
All 43 counties

Bartow County, GA, Catoosa County, GA, Chattooga County, GA, Cherokee County, GA, Dade County, GA, Dawson County, GA, Fannin County, GA, Floyd County, GA, Gilmer County, GA, Gordon County, GA, Lumpkin County, GA, Murray County, GA, Pickens County, GA, Polk County, GA, Towns County, GA, Union County, GA, Walker County, GA, Whitfield County, GA, Cherokee County, NC, Clay County, NC, Anderson County, TN, Bledsoe County, TN, Blount County, TN, Bradley County, TN, Campbell County, TN, Claiborne County, TN, Grainger County, TN, Hamilton 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, Union County, TN

The radar

The Northeast Alabama radar (KHTX), 134 km from the middle of the area, began a volume at 20:33 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.

Warnings issued inside it

15 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.

IssuedProductOfficeCountiesLasted
Apr 21, 4:45 PM EDTSevere Thunderstorm WarningMRXMarion30 min
Apr 21, 4:55 PM EDTSevere Thunderstorm WarningMRXBledsoe35 min
Apr 21, 5:12 PM EDTSevere Thunderstorm WarningMRXHamilton48 min
Apr 21, 5:49 PM EDTSevere Thunderstorm WarningMRXMorgan, Roane41 min
Apr 21, 6:12 PM EDTSevere Thunderstorm WarningMRXAnderson48 min
Apr 21, 6:29 PM EDTTornado WarningMRXRoane31 min
Apr 21, 6:43 PM EDTTornado WarningMRXAnderson, Knox47 min
Apr 21, 7:03 PM EDTSevere Thunderstorm WarningFFCWhitfield27 min
Apr 21, 7:10 PM EDTSevere Thunderstorm WarningMRXUnion35 min
Apr 21, 7:12 PM EDTSevere Thunderstorm WarningMRXLoudon, Monroe33 min
Apr 21, 7:29 PM EDTSevere Thunderstorm WarningFFCMurray, Whitfield14 min
Apr 21, 7:44 PM EDTSevere Thunderstorm WarningMRXBlount, Knox, Loudon46 min
Apr 21, 7:54 PM EDTSevere Thunderstorm WarningMRXHamilton36 min
Apr 21, 8:24 PM EDTSevere Thunderstorm WarningMRXSevier36 min
Apr 21, 8:43 PM EDTSevere Thunderstorm WarningMRXJefferson32 min

Discussions around it

SPC mesoscale discussions over the same counties from four hours before the watch to its end.

The nearest sounding before it

Nashville Metro, TN (KBNA), launched 12:00Z, 8.6 hours before the alert went out and 186 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 2006-04-21Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 3 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 2006-04-21The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 98 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
3 J/kg
Mixed-layer CIN
-311 J/kg
Mixed-layer LCL
1339 m above ground
0-6 km bulk shear
56 kt
0-1 km storm-relative helicity
98 m²/s²
0-3 km storm-relative helicity
140 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Apr 20, 8:55 PM EDTMesoscale DiscussionSPCBanks, Barrow, Bartow, Butts, Carroll, Catoosa and 49 more2 hr
Apr 21, 3:15 AM EDTMesoscale DiscussionSPCCatoosa, Chattooga, Dade, Murray, Walker, Whitfield2 hr
Apr 21, 1:17 PM EDTMesoscale DiscussionSPCBartow, Carroll, Catoosa, Chattooga, Cherokee, Dade and 12 more88 min
Apr 21, 4:39 PM EDTMesoscale DiscussionSPCBartow, Butts, Carroll, Chattahoochee, Cherokee, Clay and 31 more66 min
Apr 21, 7:22 PM EDTMesoscale DiscussionSPCColumbia, Elbert, Franklin, Hart, Lincoln, McDuffie and 7 more83 min
Apr 20, 10:31 PM EDTMesoscale DiscussionSPCBenton, Carroll, Chester, Crockett, Decatur, Dickson and 22 more89 min
Apr 20, 11:00 PM EDTSevere Thunderstorm WatchSPCBenton, Carroll, Cheatham, Chester, Crockett, Davidson and 30 more7 hr
Apr 21, 1:04 AM EDTMesoscale DiscussionSPCHardeman, Hardin, McNairy116 min
Apr 21, 6:00 AM EDTMesoscale DiscussionSPCChester, Decatur, Fayette, Giles, Hardeman, Hardin and 5 more60 min
Apr 21, 2:24 PM EDTSevere Thunderstorm WatchSPCFranklin, Lincoln, Moore8 hr

Nearby

Tornado Watches in Tennessee, 2006Tornado Watches in Georgia, 2006Tornado Watches in North Carolina, 2006Every tornado watch in 2006

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.