Alert archive / Tennessee / Mesoscale Discussions in 2004

Mesoscale Discussion 2331

October 18, 200424 counties in Kentucky; Alcorn County, Benton County, Mississippi; 39 counties in Tennessee

The Storm Prediction Center issued this mesoscale discussion at Oct 18, 2004, 9:09 PM CDT for 24 counties in Kentucky; Alcorn County, Benton County, Mississippi; 39 counties in Tennessee. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued
Oct 18, 2004, 9:09 PM CDT (02:09 UTC)
Expired
Oct 18, 2004, 11:15 PM CDT
In force
2 hr
Issued by
the Storm Prediction Center
All 65 counties

Allen County, KY, Butler County, KY, Caldwell County, KY, Calloway County, KY, Carlisle County, KY, Christian County, KY, Crittenden County, KY, Edmonson County, KY, Fulton County, KY, Graves County, KY, Hickman County, KY, Hopkins County, KY, Livingston County, KY, Logan County, KY, Lyon County, KY, Marshall County, KY, McCracken County, KY, McLean County, KY, Muhlenberg County, KY, Ohio County, KY, Simpson County, KY, Todd County, KY, Trigg County, KY, Warren County, KY, Alcorn County, MS, Benton County, MS, Benton County, TN, Carroll County, TN, Cheatham County, TN, Chester County, TN, Crockett County, TN, Davidson County, TN, Decatur County, TN, Dickson County, TN, Dyer County, TN, Fayette County, TN, Gibson 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, Lauderdale County, TN, Lawrence County, TN, Lewis County, TN, Macon County, TN, Madison County, TN, Maury County, TN, McNairy County, TN, Montgomery County, TN, Obion County, TN, Perry County, TN, Robertson County, TN, Shelby County, TN, Stewart County, TN, Sumner County, TN, Tipton County, TN, Trousdale County, TN, Wayne County, TN, Weakley County, TN, Williamson County, TN, Wilson County, TN

The watches that followed

Watches SPC issued over any of the same counties within four hours of this discussion.

The nearest sounding before it

Nashville Metro, TN (KBNA), launched 00:00Z, 2.2 hours before the alert went out and 133 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 2004-10-19Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 501 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 2004-10-19The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 558 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
501 J/kg
Mixed-layer CIN
-126 J/kg
Mixed-layer LCL
627 m above ground
0-6 km bulk shear
55 kt
0-1 km storm-relative helicity
558 m²/s²
0-3 km storm-relative helicity
651 m²/s²
Significant tornado parameter
0.9
Supercell composite
16.3

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
Oct 18, 8:00 PM CDTTornado WatchSPCAllen, Calloway, Fulton3 hr
Oct 18, 10:33 PM CDTMesoscale DiscussionSPCAllen, Monroe117 min
Oct 18, 10:55 PM CDTTornado WatchSPCAllen5 hr
Oct 19, 2:04 AM CDTMesoscale DiscussionSPCClinton, Monroe86 min
Oct 18, 7:10 PM CDTTornado WatchSPCAlcorn, Benton, Calhoun, Chickasaw, Choctaw, Clay and 15 more4 hr
Oct 19, 3:34 AM CDTMesoscale DiscussionSPCAlcorn, Benton, Coahoma, DeSoto, Itawamba, Lafayette and 11 more26 min
Oct 19, 3:50 AM CDTSevere Thunderstorm WatchSPCAlcorn, Chickasaw, Itawamba, Lee, Monroe, Prentiss and 2 more4 hr
Oct 19, 7:08 AM CDTMesoscale DiscussionSPCChickasaw, Itawamba, Lee, Monroe2 hr
Oct 19, 9:05 AM CDTTornado WatchSPCAttala, Calhoun, Carroll, Chickasaw, Choctaw, Clay and 21 more7 hr
Oct 19, 11:06 AM CDTMesoscale DiscussionSPCClarke, Copiah, Covington, Forrest, Franklin, Greene and 16 more84 min
Oct 19, 12:00 PM CDTTornado WatchSPCClaiborne, Clarke, Copiah, Covington, Forrest, Franklin and 21 more7 hr
Oct 19, 1:15 PM CDTMesoscale DiscussionSPCAttala, Calhoun, Carroll, Chickasaw, Choctaw, Clay and 20 more90 min
Oct 19, 1:35 PM CDTMesoscale DiscussionSPCAdams, Amite, Franklin, Hancock, Issaquena, Jefferson and 3 more2 hr
Oct 19, 3:08 PM CDTMesoscale DiscussionSPCAmite, Attala, Calhoun, Carroll, Chickasaw, Choctaw and 51 more67 min
Oct 19, 3:30 PM CDTTornado WatchSPCAttala, Calhoun, Carroll, Chickasaw, Choctaw, Clay and 21 more6 hr
Oct 19, 5:48 PM CDTMesoscale DiscussionSPCClarke, Covington, Hinds, Jasper, Jones, Kemper and 10 more117 min
Oct 19, 6:20 PM CDTTornado WatchSPCClarke, Covington, Forrest, Greene, Jasper, Jones and 9 more4 hr
Oct 19, 3:10 PM CDTMesoscale DiscussionSPCCarroll, Chester, Crockett, Fayette, Gibson, Hardeman and 7 more3 hr

Nearby

Mesoscale Discussions in Tennessee, 2004Mesoscale Discussions in Kentucky, 2004Mesoscale Discussions in Mississippi, 2004Every mesoscale discussion in 2004

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.