Alert archive / Tennessee / Severe Thunderstorm Watches in 2003

Severe Thunderstorm Watch 104

April 6, 2003Lauderdale County, Alabama; 34 counties in Tennessee

The Storm Prediction Center issued this severe thunderstorm watch at Apr 6, 2003, 1:20 PM CDT for Lauderdale County, Alabama; 34 counties in Tennessee. It was in force for 6 hr.

The area

The outline as issued.

The facts

Issued
Apr 6, 2003, 1:20 PM CDT (18:20 UTC)
Expired
Apr 6, 2003, 7:00 PM CDT
In force
6 hr
Issued by
the Storm Prediction Center
All 35 counties

Lauderdale County, AL, Bedford County, TN, Cannon County, TN, Cheatham County, TN, Coffee County, TN, Davidson County, TN, DeKalb County, TN, Dickson County, TN, Franklin 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, Lincoln County, TN, Macon County, TN, Marion County, TN, Marshall County, TN, Maury County, TN, Montgomery County, TN, Moore County, TN, Perry County, TN, Robertson County, TN, Rutherford County, TN, Smith County, TN, Stewart County, TN, Sumner County, TN, Trousdale County, TN, Warren County, TN, Wayne County, TN, Williamson County, TN, Wilson County, TN

The radar

The Nashville radar (KOHX), 51 km from the middle of the area, began a volume at 18:19 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

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

IssuedProductOfficeCountiesLasted
Apr 6, 1:25 PM CDTSevere Thunderstorm WarningOHXHumphreys35 min
Apr 6, 1:35 PM CDTSevere Thunderstorm WarningOHXWilson40 min
Apr 6, 1:40 PM CDTSevere Thunderstorm WarningOHXSumner50 min
Apr 6, 1:50 PM CDTSevere Thunderstorm WarningOHXDickson40 min
Apr 6, 2:14 PM CDTSevere Thunderstorm WarningOHXCheatham46 min
Apr 6, 2:32 PM CDTSevere Thunderstorm WarningOHXRobertson43 min
Apr 6, 2:48 PM CDTFlash Flood WarningOHXDavidson117 min
Apr 6, 3:01 PM CDTSevere Thunderstorm WarningOHXDavidson, Sumner, Wilson44 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, 6.3 hours before the alert went out and 40 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 2003-04-06Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 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 2003-04-06The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 140 square meters per square second.1939587897Sfc1 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
1528 m above ground
0-6 km bulk shear
58 kt
0-1 km storm-relative helicity
140 m²/s²
0-3 km storm-relative helicity
304 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

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

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SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Apr 6, 9:19 AM CDTMesoscale DiscussionSPCLimestone, Madison116 min
Apr 6, 12:40 PM CDTMesoscale DiscussionSPCGreene, Hale, Marengo, Perry, Pickens, Sumter and 1 more2 hr
Apr 6, 1:35 PM CDTTornado WatchSPCBibb, Butler, Chilton, Choctaw, Clarke, Dallas and 8 more5 hr
Apr 6, 2:56 PM CDTMesoscale DiscussionSPCBibb, Chilton, Dallas, Greene, Hale, Perry and 4 more2 hr
Apr 6, 6:23 PM CDTMesoscale DiscussionSPCBibb, Blount, Choctaw, Cullman, Fayette, Franklin and 14 more97 min
Apr 6, 6:50 PM CDTTornado WatchSPCAutauga, Bibb, Chilton, Choctaw, Cullman, Dallas and 12 more6 hr
Apr 6, 11:05 AM CDTSevere Thunderstorm WatchSPCBenton, Carroll, Chester, Crockett, Decatur, Dyer and 11 more5 hr
Apr 6, 12:27 PM CDTMesoscale DiscussionSPCCrockett, Dyer, Fayette, Gibson, Hardeman, Haywood and 4 more2 hr
Apr 6, 1:07 PM CDTMesoscale DiscussionSPCBedford, Bledsoe, Bradley, Cannon, Cheatham, Coffee and 33 more113 min
Apr 6, 3:02 PM CDTMesoscale DiscussionSPCBedford, Cannon, Cheatham, Coffee, Davidson, DeKalb and 18 more118 min

Nearby

Severe Thunderstorm Watches in Tennessee, 2003Severe Thunderstorm Watches in Alabama, 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; radar from the NEXRAD Level II archive.