Alert archive / Tennessee / Tornado Watches in 2011

Tornado Watch 16

February 24, 201123 counties in Kentucky; 39 counties in Tennessee

The Storm Prediction Center issued this tornado watch at Feb 24, 2011, 7:41 PM CST for 23 counties in Kentucky; 39 counties in Tennessee. It was in force for 5 hr.

The area

The outline as issued.

The facts

Issued
Feb 24, 2011, 7:41 PM CST (01:41 UTC)
Expired
Feb 25, 2011, 12:32 AM CST
In force
5 hr
Issued by
the Storm Prediction Center
Largest hail expected
1 in
Strongest gust expected
65 kt
All 62 counties

Adair County, KY, Allen County, KY, Barren County, KY, Boyle County, KY, Butler County, KY, Casey County, KY, Clinton County, KY, Cumberland County, KY, Edmonson County, KY, Grayson County, KY, Green County, KY, Hart County, KY, Larue County, KY, Lincoln County, KY, Logan County, KY, Marion County, KY, Metcalfe County, KY, Monroe County, KY, Ohio County, KY, Russell County, KY, Simpson County, KY, Taylor County, KY, Warren County, KY, Bedford County, TN, Benton County, TN, Cannon County, TN, Cheatham County, TN, Clay County, TN, Coffee County, TN, Cumberland County, TN, Davidson County, TN, DeKalb County, TN, Dickson County, TN, Fentress County, TN, Giles County, TN, Grundy County, TN, Hickman County, TN, Houston County, TN, Humphreys County, TN, Jackson County, TN, Lawrence County, TN, Lewis County, TN, Macon County, TN, Marshall County, TN, Maury County, TN, Montgomery County, TN, Overton County, TN, Perry County, TN, Pickett County, TN, Putnam County, TN, Robertson County, TN, Rutherford County, TN, Smith County, TN, Stewart County, TN, Sumner County, TN, Trousdale County, TN, Van Buren County, TN, Warren County, TN, Wayne County, TN, White County, TN, Williamson County, TN, Wilson County, TN

The radar

The Nashville radar (KOHX), 52 km from the middle of the area, began a volume at 01:43 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.

What SPC expected

The probabilities SPC published with the watch, for the watch area over its life.

Two or more tornadoes
40%
One or more EF2 to EF5 tornadoes
20%
Ten or more severe wind reports
70%
One or more gusts of 65 knots or more
40%
Ten or more severe hail reports
10%
One or more hailstones of 2 inches or more
5%
Six or more combined severe hail and wind reports
90%

Warnings issued inside it

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

IssuedProductOfficeCountiesLasted
Feb 24, 8:24 PM CSTSevere Thunderstorm WarningOHXBenton, Houston, Humphreys, Stewart36 min
Feb 24, 8:28 PM CSTSevere Thunderstorm WarningLMKButler, Logan, Ohio32 min
Feb 24, 8:30 PM CSTTornado WarningOHXPerry30 min
Feb 24, 8:30 PM CSTTornado WarningOHXBenton, Houston, Humphreys, Stewart30 min
Feb 24, 8:51 PM CSTSevere Thunderstorm WarningLMKButler, Edmonson, Grayson, Warren24 min
Feb 24, 8:54 PM CSTTornado WarningOHXHickman36 min
Feb 24, 8:58 PM CSTSevere Thunderstorm WarningOHXCheatham, Davidson, Dickson, Houston, Humphreys, Montgomery and 2 more63 min
Feb 24, 9:00 PM CSTSevere Thunderstorm WarningOHXLewis, Wayne45 min
Feb 24, 9:00 PM CSTTornado WarningOHXCheatham, Dickson, Houston, Humphreys, Montgomery30 min
Feb 24, 9:12 PM CSTTornado WarningOHXDickson, Humphreys33 min
Feb 24, 9:13 PM CSTSevere Thunderstorm WarningLMKButler, Edmonson, Logan, Warren32 min
Feb 24, 9:14 PM CSTSevere Thunderstorm WarningLMKBreckinridge, Edmonson, Grayson, Hardin, Hart31 min
Feb 24, 9:20 PM CSTSevere Thunderstorm WarningLMKLogan, Simpson, Warren25 min
Feb 24, 9:20 PM CSTTornado WarningOHXMontgomery, Robertson, Sumner25 min
Feb 24, 9:26 PM CSTSevere Thunderstorm WarningOHXMaury, Williamson34 min
Feb 24, 9:30 PM CSTSevere Thunderstorm WarningOHXCheatham, Davidson, Dickson, Macon, Montgomery, Robertson and 3 more60 min
Feb 24, 9:34 PM CSTTornado WarningOHXCheatham, Davidson, Williamson26 min
Feb 24, 9:41 PM CSTSevere Thunderstorm WarningLMKAllen, Logan, Simpson, Warren34 min
Feb 24, 9:45 PM CSTSevere Thunderstorm WarningLMKBarren, Edmonson, Hardin, Hart, Larue30 min
Feb 24, 9:46 PM CSTSevere Thunderstorm WarningOHXBedford, Marshall, Maury, Rutherford, Williamson59 min
Feb 24, 9:47 PM CSTFlash Flood WarningLMKAllen, Barren, Butler, Edmonson, Grayson, Hardin and 6 more3 hr
Feb 24, 9:58 PM CSTTornado WarningLMKLarue17 min
Feb 24, 9:58 PM CSTSevere Thunderstorm WarningOHXGiles, Lawrence, Lewis, Wayne62 min
Feb 24, 10:00 PM CSTTornado WarningLMKAllen, Barren, Edmonson, Hart, Warren30 min
Feb 24, 10:02 PM CSTTornado Warning EmergencyOHXDavidson, Rutherford, Wilson28 min
Feb 24, 10:08 PM CSTTornado WarningOHXDavidson, Macon, Smith, Sumner, Trousdale, Wilson37 min
Feb 24, 10:16 PM CSTSevere Thunderstorm WarningLMKAllen, Barren, Metcalfe, Monroe29 min
Feb 24, 10:17 PM CSTTornado WarningOHXMacon, Sumner, Trousdale43 min
Feb 24, 10:22 PM CSTSevere Thunderstorm WarningLMKAdair, Allen, Barren, Cumberland, Green, Hart and 2 more23 min
Feb 24, 10:24 PM CSTSevere Thunderstorm WarningLMKGreen, Larue, Marion, Taylor36 min
Feb 24, 10:26 PM CSTSevere Thunderstorm WarningOHXClay, Fentress, Jackson, Macon, Overton, Pickett and 5 more79 min
Feb 24, 10:27 PM CSTFlash Flood WarningOHXStewart3 hr
Feb 24, 10:36 PM CSTTornado WarningOHXClay, Jackson, Macon24 min
Feb 24, 10:37 PM CSTSevere Thunderstorm WarningOHXBedford, Cannon, Coffee, Marshall, Maury, Rutherford23 min
Feb 24, 10:39 PM CSTTornado WarningOHXClay, Fentress, Jackson, Macon, Overton, Pickett and 2 more36 min
Feb 24, 10:45 PM CSTSevere Thunderstorm WarningLMKAdair, Casey, Clinton, Cumberland, Green, Metcalfe and 3 more30 min
Feb 24, 10:45 PM CSTSevere Thunderstorm WarningOHXDeKalb30 min
Feb 24, 10:57 PM CSTFlash Flood WarningLMKAdair, Barren, Boyle, Casey, Clinton, Cumberland and 9 more3 hr
Feb 24, 11:03 PM CSTSevere Thunderstorm WarningLMKBoyle, Garrard, Jessamine, Mercer27 min
Feb 24, 11:03 PM CSTSevere Thunderstorm WarningOHXBedford, Cannon, Coffee, Marshall, Rutherford, Warren42 min
Feb 24, 11:14 PM CSTSevere Thunderstorm WarningOHXDeKalb, White31 min
Feb 24, 11:16 PM CSTSevere Thunderstorm WarningLMKCasey, Clinton, Cumberland, Garrard, Lincoln, Madison and 1 more29 min
Feb 24, 11:31 PM CSTSevere Thunderstorm WarningOHXCoffee, Grundy, Van Buren, Warren44 min
Feb 24, 11:34 PM CSTSevere Thunderstorm WarningOHXCumberland41 min
Feb 24, 11:40 PM CSTSevere Thunderstorm WarningOHXWhite35 min
Feb 24, 11:40 PM CSTSevere Thunderstorm WarningOHXFentress, Overton, Pickett, Putnam50 min
Feb 25, 12:07 AM CSTSevere Thunderstorm WarningOHXCumberland23 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 00:00Z, 1.7 hours before the alert went out and 65 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 2011-02-25Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 17 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 2011-02-25The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 538 square meters per square second.1939587897117Sfc1 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
17 J/kg
Mixed-layer CIN
-79 J/kg
Mixed-layer LCL
793 m above ground
0-6 km bulk shear
74 kt
0-1 km storm-relative helicity
538 m²/s²
0-3 km storm-relative helicity
629 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.5

Open this sounding in Storm Lab

The text

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

755 
WWUS20 KWNS 250142
SEL6
SPC WW 250142
KYZ000-TNZ000-250700-

URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 16
NWS STORM PREDICTION CENTER NORMAN OK
745 PM CST THU FEB 24 2011

THE NWS STORM PREDICTION CENTER HAS ISSUED A
TORNADO WATCH FOR PORTIONS OF

       CENTRAL KENTUCKY
       MIDDLE TENNESSEE

EFFECTIVE THIS THURSDAY NIGHT AND FRIDAY MORNING FROM 745 PM
UNTIL 100 AM CST.

TORNADOES...HAIL TO 1 INCH IN DIAMETER...THUNDERSTORM WIND GUSTS
TO 75 MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE AREAS.

THE TORNADO WATCH AREA IS APPROXIMATELY ALONG AND 75 STATUTE
MILES EAST AND WEST OF A LINE FROM 65 MILES NORTHEAST OF BOWLING
GREEN KENTUCKY TO 65 MILES SOUTH OF NASHVILLE TENNESSEE.  FOR A
COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH OUTLINE
UPDATE (WOUS64 KWNS WOU6).

REMEMBER...A TORNADO WATCH MEANS CONDITIONS ARE FAVORABLE FOR
TORNADOES AND SEVERE THUNDERSTORMS IN AND CLOSE TO THE WATCH
AREA. PERSONS IN THESE AREAS SHOULD BE ON THE LOOKOUT FOR
THREATENING WEATHER CONDITIONS AND LISTEN FOR LATER STATEMENTS
AND POSSIBLE WARNINGS.

OTHER WATCH INFORMATION...CONTINUE...WW 14...WW 15...

DISCUSSION...FAST MOVING LINE OF SEVERE THUNDERSTORMS WITH EMBEDDED
BOWS/SUPERCELLS WILL TRACK RAPIDLY EASTWARD ACROSS PORTIONS OF
CENTRAL KY AND MIDDLE TN.  DAMAGING WINDS APPEAR TO BE THE MAIN
THREAT...HOWEVER ISOLATED QLCS TORNADOES WILL ALSO BE POSSIBLE IN
MOST INTENSE CIRCULATIONS.

AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL
SURFACE AND ALOFT TO 1 INCH. EXTREME TURBULENCE AND SURFACE WIND
GUSTS TO 65 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 450.
MEAN STORM MOTION VECTOR 24045.


...HART

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Feb 24, 7:22 PM CSTMesoscale DiscussionSPCAdair, Allen, Barren, Butler, Caldwell, Calloway and 32 more83 min
Feb 24, 10:59 PM CSTSevere Thunderstorm WatchSPCBell, Breathitt, Clay, Harlan, Jackson, Knott and 12 more5 hr
Feb 25, 12:48 AM CSTMesoscale DiscussionSPCBell, Floyd, Harlan, Johnson, Knott, Lawrence and 6 more27 min
Feb 24, 8:11 PM CSTMesoscale DiscussionSPCGiles, Hardin, Lawrence, Lewis, Lincoln, McNairy and 4 more64 min
Feb 24, 8:30 PM CSTTornado WatchSPCFranklin, Lincoln, Moore6 hr
Feb 24, 10:38 PM CSTMesoscale DiscussionSPCGiles, Hardin, Lawrence, Lewis, Lincoln, McNairy and 4 more97 min
Feb 25, 1:35 AM CSTMesoscale DiscussionSPCBlount, Monroe, Polk55 min

Nearby

Tornado Watches in Tennessee, 2011Tornado Watches in Kentucky, 2011Every tornado watch 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.