Alert archive / Tennessee / Severe Thunderstorm Watches in 2003

Severe Thunderstorm Watch 143

April 20, 200311 counties in Kentucky; 40 counties in Tennessee

The Storm Prediction Center issued this severe thunderstorm watch at Apr 20, 2003, 6:25 PM CDT for 11 counties in Kentucky; 40 counties in Tennessee. It was in force for 6 hr.

The area

The outline as issued.

The facts

Issued
Apr 20, 2003, 6:25 PM CDT (23:25 UTC)
Expired
Apr 21, 2003, 12:00 AM CDT
In force
6 hr
Issued by
the Storm Prediction Center
All 51 counties

Allen County, KY, Barren County, KY, Calloway County, KY, Christian County, KY, Graves County, KY, Logan County, KY, Marshall County, KY, Monroe County, KY, Simpson County, KY, Todd County, KY, Trigg County, KY, Bedford County, TN, Benton County, TN, Carroll County, TN, Cheatham County, TN, Chester County, TN, Crockett County, TN, Davidson County, TN, Decatur County, TN, Dickson County, TN, Fayette County, TN, Gibson County, TN, Giles County, TN, Hardeman County, TN, Hardin County, TN, Haywood County, TN, Henderson County, TN, Henry County, TN, Hickman County, TN, Houston County, TN, Humphreys County, TN, Lawrence County, TN, Lewis County, TN, Lincoln County, TN, Macon County, TN, Madison County, TN, Marshall County, TN, Maury County, TN, McNairy County, TN, Montgomery County, TN, Perry County, TN, Robertson County, TN, Rutherford County, TN, Smith County, TN, Stewart County, TN, Sumner County, TN, Trousdale County, TN, Wayne County, TN, Weakley County, TN, Williamson County, TN, Wilson County, TN

Warnings issued inside it

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

IssuedProductOfficeCountiesLasted
Apr 20, 6:26 PM CDTSevere Thunderstorm WarningOHXLawrence, Wayne49 min
Apr 20, 6:27 PM CDTSevere Thunderstorm WarningOHXHouston, Humphreys48 min
Apr 20, 6:59 PM CDTSevere Thunderstorm WarningOHXGiles31 min
Apr 20, 7:14 PM CDTSevere Thunderstorm WarningMEGCrockett, Gibson31 min
Apr 20, 8:24 PM CDTSevere Thunderstorm WarningMEGCrockett, Gibson51 min
Apr 20, 9:48 PM CDTSevere Thunderstorm WarningLMKButler, Logan, Warren57 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, 11.4 hours before the alert went out and 139 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 2003-04-20Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 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 2003-04-20The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 255 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
706 m above ground
0-6 km bulk shear
37 kt
0-1 km storm-relative helicity
255 m²/s²
0-3 km storm-relative helicity
229 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, 11:52 AM CDTMesoscale DiscussionSPCBallard, Caldwell, Calloway, Carlisle, Christian, Crittenden and 17 more2 hr
Apr 20, 12:20 PM CDTSevere Thunderstorm WatchSPCMeade6 hr
Apr 20, 1:00 PM CDTMesoscale DiscussionSPCBallard, Breckinridge, Butler, Caldwell, Calloway, Carlisle and 24 more3 hr
Apr 20, 1:45 PM CDTSevere Thunderstorm WatchSPCBallard, Breckinridge, Butler, Caldwell, Calloway, Carlisle and 22 more5 hr
Apr 20, 3:15 PM CDTSevere Thunderstorm WatchSPCBoone, Bracken, Campbell, Carroll, Gallatin, Grant and 8 more6 hr
Apr 20, 3:29 PM CDTMesoscale DiscussionSPCAdair, Allen, Anderson, Barren, Bath, Bourbon and 43 more2 hr
Apr 20, 4:35 PM CDTTornado WatchSPCAdair, Allen, Anderson, Barren, Boyle, Breckinridge and 34 more5 hr
Apr 20, 5:31 PM CDTMesoscale DiscussionSPCBoone, Bracken, Campbell, Gallatin, Greenup, Kenton and 1 more89 min
Apr 20, 6:04 PM CDTMesoscale DiscussionSPCAdair, Anderson, Barren, Boyle, Breckinridge, Bullitt and 33 more116 min

Nearby

Severe Thunderstorm Watches in Tennessee, 2003Severe Thunderstorm Watches in Kentucky, 2003Every severe thunderstorm watch in 2003

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.