Alert archive / Tennessee / Severe Thunderstorm Watches in 2014

Severe Thunderstorm Watch 272

June 9, 20144 counties in Alabama; 14 counties in Georgia; 33 counties in Tennessee

The Storm Prediction Center issued this severe thunderstorm watch at Jun 9, 2014, 8:57 PM CDT for 4 counties in Alabama; 14 counties in Georgia; 33 counties in Tennessee. It was in force for 7 hr.

The area

The outline as issued.

The facts

Issued
Jun 9, 2014, 8:57 PM CDT (01:57 UTC)
Expired
Jun 10, 2014, 4:00 AM CDT
In force
7 hr
Issued by
the Storm Prediction Center
Largest hail expected
1.5 in
Strongest gust expected
60 kt
All 51 counties

DeKalb County, AL, Jackson County, AL, Madison County, AL, Marshall County, AL, Bartow County, GA, Carroll County, GA, Catoosa County, GA, Chattooga County, GA, Dade County, GA, Floyd County, GA, Gordon County, GA, Haralson County, GA, Heard County, GA, Murray County, GA, Paulding County, GA, Polk County, GA, Walker County, GA, Whitfield County, GA, Bedford County, TN, Benton County, TN, Bradley County, TN, Cannon County, TN, Cheatham County, TN, Coffee County, TN, Davidson County, TN, Decatur County, TN, Dickson County, TN, Franklin County, TN, Giles County, TN, Grundy County, TN, Hamilton County, TN, Hickman County, TN, Houston County, TN, Humphreys County, TN, Lawrence County, TN, Lewis County, TN, Lincoln County, TN, Marion County, TN, Marshall County, TN, Maury County, TN, Montgomery County, TN, Moore County, TN, Perry County, TN, Polk County, TN, Robertson County, TN, Rutherford County, TN, Sequatchie County, TN, Stewart County, TN, Warren County, TN, Wayne County, TN, Williamson County, TN

The radar

The Northeast Alabama radar (KHTX), 68 km from the middle of the area, began a volume at 02:00 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
20%
One or more EF2 to EF5 tornadoes
2%
Ten or more severe wind reports
60%
One or more gusts of 65 knots or more
10%
Ten or more severe hail reports
20%
One or more hailstones of 2 inches or more
5%
Six or more combined severe hail and wind reports
90%

Warnings issued inside it

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

IssuedProductOfficeCountiesLasted
Jun 9, 8:58 PM CDTSevere Thunderstorm WarningOHXGiles, Hickman, Lawrence, Lewis, Maury, Perry and 1 more32 min
Jun 9, 9:14 PM CDTSevere Thunderstorm WarningHUNCullman, Limestone, Madison, Marshall, Morgan31 min
Jun 9, 9:21 PM CDTSevere Thunderstorm WarningOHXBedford, Giles, Hickman, Marshall, Maury, Williamson39 min
Jun 9, 9:45 PM CDTSevere Thunderstorm WarningHUNJackson, Madison, Marshall, Morgan30 min
Jun 9, 9:48 PM CDTSevere Thunderstorm WarningOHXBedford, Coffee, Hickman, Marshall, Maury, Rutherford and 1 more27 min
Jun 9, 10:03 PM CDTSevere Thunderstorm WarningOHXCheatham, Davidson, Dickson, Robertson, Williamson42 min
Jun 9, 10:14 PM CDTSevere Thunderstorm WarningOHXBedford, Cannon, Coffee, Davidson, Grundy, Rutherford and 3 more31 min
Jun 9, 10:46 PM CDTSevere Thunderstorm WarningMRXHamilton, Marion, Sequatchie44 min
Jun 9, 11:01 PM CDTSevere Thunderstorm WarningHUNJackson29 min
Jun 9, 11:29 PM CDTSevere Thunderstorm WarningMRXBledsoe, Hamilton, Marion, Rhea, Sequatchie31 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, 2.0 hours before the alert went out and 90 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 2014-06-10Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 120 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 2014-06-10The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 69 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
120 J/kg
Mixed-layer CIN
-91 J/kg
Mixed-layer LCL
812 m above ground
0-6 km bulk shear
32 kt
0-1 km storm-relative helicity
69 m²/s²
0-3 km storm-relative helicity
157 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.1

Open this sounding in Storm Lab

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Jun 9, 8:13 PM CDTMesoscale DiscussionSPCAutauga, Bibb, Blount, Calhoun, Cherokee, Chilton and 19 more92 min
Jun 9, 10:17 PM CDTMesoscale DiscussionSPCAutauga, Blount, Calhoun, Cherokee, Chilton, Clay and 15 more88 min
Jun 10, 10:10 AM CDTMesoscale DiscussionSPCChoctaw, Clarke, Dallas, Greene, Hale, Marengo and 6 more65 min
Jun 10, 10:34 AM CDTMesoscale DiscussionSPCBibb, Blount, Cullman, DeKalb, Etowah, Hale and 12 more116 min
Jun 10, 10:51 AM CDTSevere Thunderstorm WatchSPCAutauga, Bibb, Blount, Bullock, Calhoun, Chambers and 35 more7 hr
Jun 10, 10:58 AM CDTSevere Thunderstorm WatchSPCBaldwin, Butler, Choctaw, Clarke, Conecuh, Covington and 6 more8 hr
Jun 10, 1:26 PM CDTMesoscale DiscussionSPCBaldwin, Butler, Conecuh, Covington, Crenshaw, Escambia and 2 more94 min
Jun 10, 1:57 PM CDTMesoscale DiscussionSPCCalhoun, Chambers, Cherokee, Clay, Cleburne, Coosa and 11 more93 min
Jun 10, 3:03 PM CDTMesoscale DiscussionSPCBaldwin, Butler, Coffee, Conecuh, Covington, Dale and 3 more87 min
Jun 10, 3:57 PM CDTMesoscale DiscussionSPCChambers, Randolph63 min
Jun 10, 2:24 PM CDTSevere Thunderstorm WatchSPCBanks, Barrow, Bartow, Butts, Carroll, Chattahoochee and 55 more8 hr
Jun 10, 5:14 PM CDTMesoscale DiscussionSPCHabersham, Rabun, Towns, White91 min
Jun 10, 5:34 PM CDTMesoscale DiscussionSPCBaker, Baldwin, Banks, Barrow, Bibb, Bleckley and 72 more56 min

Nearby

Severe Thunderstorm Watches in Tennessee, 2014Severe Thunderstorm Watches in Georgia, 2014Severe Thunderstorm Watches in Alabama, 2014Every severe thunderstorm watch in 2014

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.