Alert archive / Tennessee / Mesoscale Discussions in 2004

Mesoscale Discussion 2332

October 18, 20045 states

The Storm Prediction Center issued this mesoscale discussion at Oct 18, 2004, 10:33 PM CDT for 5 states. It was in force for 117 min.

The area

The outline as issued.

The facts

Issued
Oct 18, 2004, 10:33 PM CDT (03:33 UTC)
Expired
Oct 19, 2004, 12:30 AM CDT
In force
117 min
Issued by
the Storm Prediction Center
All 102 counties

Colbert County, AL, Franklin County, AL, Lauderdale County, AL, Limestone County, AL, Arkansas County, AR, Crittenden County, AR, Cross County, AR, Jefferson County, AR, Lee County, AR, Mississippi County, AR, Monroe County, AR, Phillips County, AR, Poinsett County, AR, St. Francis County, AR, Allen County, KY, Monroe County, KY, Alcorn County, MS, Benton County, MS, Bolivar County, MS, Calhoun County, MS, Coahoma County, MS, DeSoto County, MS, Grenada County, MS, Itawamba County, MS, Lafayette County, MS, Lee County, MS, Marshall County, MS, Panola County, MS, Pontotoc County, MS, Prentiss County, MS, Quitman County, MS, Tallahatchie County, MS, Tate County, MS, Tippah County, MS, Tishomingo County, MS, Tunica County, MS, Union County, MS, Yalobusha County, MS, Bedford County, TN, Benton County, TN, Bledsoe County, TN, Cannon County, TN, Carroll County, TN, Cheatham County, TN, Chester County, TN, Clay County, TN, Coffee County, TN, Crockett County, TN, Cumberland County, TN, Davidson County, TN, Decatur County, TN, DeKalb County, TN, Dickson County, TN, Dyer County, TN, Fayette County, TN, Fentress County, TN, Franklin County, TN, Gibson County, TN, Giles County, TN, Grundy 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, Jackson County, TN, Lauderdale 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, Moore County, TN, Morgan County, TN, Overton County, TN, Perry County, TN, Pickett County, TN, Putnam County, TN, Rhea County, TN, Roane County, TN, Robertson County, TN, Rutherford County, TN, Scott County, TN, Sequatchie County, TN, Shelby County, TN, Smith County, TN, Sumner County, TN, Tipton County, TN, Trousdale County, TN, Van Buren County, TN, Warren County, TN, Wayne County, TN, White County, TN, Williamson County, TN, Wilson County, TN

The radar

The Memphis radar (KNQA), 152 km from the middle of the area, began a volume at 03:36 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.

The watches that followed

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

The nearest sounding before it

Little Rock, AR (KLZK), launched 00:00Z, 3.6 hours before the alert went out and 167 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, Little Rock, AR at 00:00Z on 2004-10-19Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 3284 joules per kilogram.LCLEL10008507005003002001001 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, Little Rock, AR at 00:00Z on 2004-10-19The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 151 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
3284 J/kg
Mixed-layer CIN
-9 J/kg
Mixed-layer LCL
1041 m above ground
0-6 km bulk shear
37 kt
0-1 km storm-relative helicity
151 m²/s²
0-3 km storm-relative helicity
289 m²/s²
Significant tornado parameter
4.1
Supercell composite
18.9

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, 7:10 PM CDTTornado WatchSPCColbert, Fayette, Franklin, Greene, Hale, Lamar and 8 more4 hr
Oct 18, 10:55 PM CDTTornado WatchSPCColbert, Franklin, Lauderdale, Lawrence, Limestone, Madison and 1 more5 hr
Oct 19, 2:04 AM CDTMesoscale DiscussionSPCColbert, Franklin, Jackson, Lauderdale, Lawrence, Limestone and 2 more86 min
Oct 19, 3:34 AM CDTMesoscale DiscussionSPCColbert, DeKalb, Franklin, Jackson, Lauderdale, Lawrence and 4 more26 min
Oct 19, 3:50 AM CDTSevere Thunderstorm WatchSPCCherokee, Colbert, Cullman, DeKalb, Etowah, Franklin and 9 more4 hr
Oct 19, 7:08 AM CDTMesoscale DiscussionSPCCherokee, Cullman, DeKalb, Etowah, Franklin, Jackson and 6 more2 hr
Oct 19, 9:05 AM CDTTornado WatchSPCAutauga, Bibb, Calhoun, Chambers, Chilton, Clay and 20 more7 hr
Oct 19, 11:06 AM CDTMesoscale DiscussionSPCBarbour, Butler, Choctaw, Clarke, Coffee, Conecuh and 10 more84 min
Oct 19, 12:00 PM CDTTornado WatchSPCBarbour, Bullock, Butler, Choctaw, Clarke, Coffee and 16 more7 hr
Oct 19, 1:15 PM CDTMesoscale DiscussionSPCAutauga, Bibb, Calhoun, Chambers, Chilton, Clay and 20 more90 min
Oct 19, 3:08 PM CDTMesoscale DiscussionSPCAutauga, Barbour, Bibb, Bullock, Butler, Calhoun and 43 more67 min
Oct 19, 3:30 PM CDTTornado WatchSPCAutauga, Bibb, Chilton, Clay, Coosa, Dallas and 16 more6 hr
Oct 19, 5:48 PM CDTMesoscale DiscussionSPCButler, Choctaw, Clarke, Coffee, Conecuh, Covington and 13 more117 min
Oct 19, 6:20 PM CDTTornado WatchSPCBarbour, Butler, Choctaw, Clarke, Coffee, Conecuh and 16 more4 hr
Oct 18, 8:00 PM CDTTornado WatchSPCClay, Craighead, Crittenden, Cross, Greene, Mississippi and 2 more3 hr
Oct 18, 9:09 PM CDTMesoscale DiscussionSPCAllen, Butler, Caldwell, Calloway, Carlisle, Christian and 18 more2 hr
Oct 19, 1:35 PM CDTMesoscale DiscussionSPCAdams, Amite, Franklin, Hancock, Issaquena, Jefferson and 3 more2 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 Mississippi, 2004Mesoscale Discussions in Arkansas, 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; radar from the NEXRAD Level II archive.