Alert archive / Tennessee / Severe Thunderstorm Watches in 2012

Severe Thunderstorm Watch 471

July 5, 20129 counties in Kentucky; Cherokee County, Clay County, North Carolina; 40 counties in Tennessee

The Storm Prediction Center issued this severe thunderstorm watch at Jul 5, 2012, 2:19 PM CDT for 9 counties in Kentucky; Cherokee County, Clay County, North Carolina; 40 counties in Tennessee. It was in force for 6 hr.

The area

The outline as issued.

The facts

Issued
Jul 5, 2012, 2:19 PM CDT (19:19 UTC)
Expired
Jul 5, 2012, 8:05 PM CDT
In force
6 hr
Issued by
the Storm Prediction Center
Largest hail expected
1.5 in
Strongest gust expected
60 kt
All 51 counties

Adair County, KY, Casey County, KY, Clinton County, KY, Cumberland County, KY, Green County, KY, Metcalfe County, KY, Monroe County, KY, Russell County, KY, Taylor County, KY, Cherokee County, NC, Clay County, NC, Anderson County, TN, Bledsoe County, TN, Blount County, TN, Bradley County, TN, Campbell County, TN, Cannon County, TN, Claiborne County, TN, Clay County, TN, Cocke County, TN, Coffee County, TN, Cumberland County, TN, DeKalb County, TN, Fentress County, TN, Grainger County, TN, Grundy County, TN, Hamblen County, TN, Hamilton County, TN, Jackson 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, Overton County, TN, Pickett County, TN, Polk County, TN, Putnam County, TN, Rhea County, TN, Roane County, TN, Scott County, TN, Sequatchie County, TN, Sevier County, TN, Smith County, TN, Union County, TN, Van Buren County, TN, Warren County, TN, White County, TN

The radar

The Knoxville radar (KMRX), 136 km from the middle of the area, began a volume at 19:18 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
5%
One or more EF2 to EF5 tornadoes
2%
Ten or more severe wind reports
60%
One or more gusts of 65 knots or more
30%
Ten or more severe hail reports
40%
One or more hailstones of 2 inches or more
20%
Six or more combined severe hail and wind reports
80%

Warnings issued inside it

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

IssuedProductOfficeCountiesLasted
Jul 5, 2:22 PM CDTSevere Thunderstorm WarningLMKBoyle, Casey, Marion, Washington33 min
Jul 5, 2:49 PM CDTSevere Thunderstorm WarningLMKBoyle, Casey, Lincoln, Marion46 min
Jul 5, 3:13 PM CDTSevere Thunderstorm WarningLMKAdair, Casey, Lincoln32 min
Jul 5, 3:27 PM CDTSevere Thunderstorm WarningMRXHamblen, Hawkins63 min
Jul 5, 3:37 PM CDTSevere Thunderstorm WarningMRXCampbell, Claiborne, Grainger, Hancock, Union53 min
Jul 5, 3:55 PM CDTSevere Thunderstorm WarningLMKAdair, Clinton, Cumberland, Russell45 min
Jul 5, 4:03 PM CDTSevere Thunderstorm WarningMRXCocke, Greene, Hamblen, Hawkins, Jefferson57 min
Jul 5, 4:13 PM CDTSevere Thunderstorm WarningMRXMorgan, Scott62 min
Jul 5, 4:16 PM CDTSevere Thunderstorm WarningMRXAnderson, Blount, Campbell, Claiborne, Grainger, Knox and 2 more59 min
Jul 5, 4:22 PM CDTSevere Thunderstorm WarningOHXFentress, Pickett23 min
Jul 5, 4:24 PM CDTSevere Thunderstorm WarningOHXClay, Pickett51 min
Jul 5, 4:35 PM CDTSevere Thunderstorm WarningLMKAdair, Cumberland, Metcalfe, Monroe45 min
Jul 5, 4:51 PM CDTSevere Thunderstorm WarningMRXAnderson, Loudon, Monroe, Morgan, Roane, Scott54 min
Jul 5, 4:52 PM CDTSevere Thunderstorm WarningMRXHamilton23 min
Jul 5, 4:54 PM CDTSevere Thunderstorm WarningOHXFentress36 min
Jul 5, 4:59 PM CDTSevere Thunderstorm WarningMRXBlount, Knox, Monroe, Sevier46 min
Jul 5, 5:29 PM CDTSevere Thunderstorm WarningMRXCherokee61 min
Jul 5, 5:36 PM CDTSevere Thunderstorm WarningOHXCannon, Rutherford, Wilson39 min
Jul 5, 5:38 PM CDTSevere Thunderstorm WarningOHXBedford, Coffee37 min
Jul 5, 5:40 PM CDTSevere Thunderstorm WarningMRXMeigs, Rhea, Roane65 min
Jul 5, 5:52 PM CDTSevere Thunderstorm WarningOHXWarren23 min
Jul 5, 6:07 PM CDTSevere Thunderstorm WarningOHXCoffee23 min
Jul 5, 6:14 PM CDTSevere Thunderstorm WarningOHXCannon, Coffee31 min
Jul 5, 6:14 PM CDTSevere Thunderstorm WarningOHXVan Buren, Warren, White46 min
Jul 5, 6:17 PM CDTSevere Thunderstorm WarningOHXWarren28 min
Jul 5, 6:23 PM CDTSevere Thunderstorm WarningOHXVan Buren, Warren55 min
Jul 5, 6:25 PM CDTSevere Thunderstorm WarningMRXBradley, Polk37 min
Jul 5, 6:46 PM CDTSevere Thunderstorm WarningOHXCoffee, Warren40 min
Jul 5, 6:51 PM CDTSevere Thunderstorm WarningOHXCoffee, Grundy54 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, 7.3 hours before the alert went out and 157 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 2012-07-05Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1407 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 2012-07-05The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 22 square meters per square second.193958Sfc1 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
1407 J/kg
Mixed-layer CIN
-126 J/kg
Mixed-layer LCL
1485 m above ground
0-6 km bulk shear
19 kt
0-1 km storm-relative helicity
22 m²/s²
0-3 km storm-relative helicity
33 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
Jul 5, 10:14 AM CDTMesoscale DiscussionSPCBoyd, Breathitt, Carter, Elliott, Floyd, Greenup and 10 more91 min
Jul 5, 10:37 AM CDTSevere Thunderstorm WatchSPCBath, Bell, Boyd, Breathitt, Carter, Clay and 31 more7 hr
Jul 5, 1:57 PM CDTMesoscale DiscussionSPCBath, Bell, Breathitt, Clay, Elliott, Estill and 21 more2 hr
Jul 5, 12:11 PM CDTMesoscale DiscussionSPCBuncombe, Cherokee, Clay, Graham, Haywood, Henderson and 9 more94 min
Jul 5, 12:37 PM CDTSevere Thunderstorm WatchSPCAlexander, Avery, Buncombe, Burke, Cabarrus, Caldwell and 22 more8 hr
Jul 5, 12:40 PM CDTMesoscale DiscussionSPCAnson, Beaufort, Bertie, Bladen, Brunswick, Chowan and 34 more95 min
Jul 5, 5:41 PM CDTMesoscale DiscussionSPCBladen, Columbus, Robeson, Scotland94 min
Jul 5, 6:20 PM CDTMesoscale DiscussionSPCBedford, Cannon, Cheatham, Coffee, Davidson, Franklin and 13 more115 min

Nearby

Severe Thunderstorm Watches in Tennessee, 2012Severe Thunderstorm Watches in Kentucky, 2012Severe Thunderstorm Watches in North Carolina, 2012Every severe thunderstorm watch in 2012

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.