Alert archive / Tennessee / Mesoscale Discussions in 2004

Mesoscale Discussion 2335

October 19, 20044 states

The Storm Prediction Center issued this mesoscale discussion at Oct 19, 2004, 3:34 AM CDT for 4 states. It was in force for 26 min.

The area

The outline as issued.

The facts

Issued
Oct 19, 2004, 3:34 AM CDT (08:34 UTC)
Expired
Oct 19, 2004, 4:00 AM CDT
In force
26 min
Issued by
the Storm Prediction Center
All 68 counties

Colbert County, AL, DeKalb County, AL, Franklin County, AL, Jackson County, AL, Lauderdale County, AL, Lawrence County, AL, Limestone County, AL, Madison County, AL, Marshall County, AL, Morgan County, AL, Catoosa County, GA, Chattooga County, GA, Dade County, GA, Gordon County, GA, Murray County, GA, Walker County, GA, Whitfield County, GA, Alcorn County, MS, Benton County, MS, Coahoma County, MS, DeSoto 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, Tate County, MS, Tippah County, MS, Tishomingo County, MS, Tunica County, MS, Union County, MS, Bedford County, TN, Bledsoe County, TN, Bradley County, TN, Cannon County, TN, Chester County, TN, Coffee County, TN, Decatur County, TN, Fayette County, TN, Franklin County, TN, Giles County, TN, Grundy County, TN, Hamilton County, TN, Hardeman County, TN, Hardin County, TN, Henderson County, TN, Hickman County, TN, Lawrence County, TN, Lewis County, TN, Lincoln County, TN, Marion County, TN, Marshall County, TN, Maury County, TN, McMinn County, TN, McNairy County, TN, Meigs County, TN, Moore County, TN, Perry County, TN, Polk County, TN, Rhea County, TN, Sequatchie County, TN, Shelby County, TN, Van Buren County, TN, Warren County, TN, Wayne County, TN

The radar

The Columbus AFB radar (KGWX), 130 km from the middle of the area, began a volume at 08:38 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

Nashville Metro, TN (KBNA), launched 00:00Z, 8.6 hours before the alert went out and 164 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, 7:10 PM CDTTornado WatchSPCColbert, Fayette, Franklin, Greene, Hale, Lamar and 8 more4 hr
Oct 18, 10:33 PM CDTMesoscale DiscussionSPCColbert, Franklin, Lauderdale, Limestone117 min
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, 3:50 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 19, 2:06 PM CDTMesoscale DiscussionSPCBaker, Brooks, Calhoun, Chattahoochee, Clay, Colquitt and 26 more84 min
Oct 18, 9:09 PM CDTMesoscale DiscussionSPCAlcorn, Benton2 hr
Oct 19, 1:35 PM CDTMesoscale DiscussionSPCAdams, Amite, Franklin, Hancock, Issaquena, Jefferson and 3 more2 hr
Oct 18, 8:00 PM CDTTornado WatchSPCBedford, Benton, Carroll, Cheatham, Chester, Crockett and 38 more3 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 Alabama, 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.