Alert archive / Tennessee / Mesoscale Discussions in 2005

Mesoscale Discussion 509

April 6, 200525 counties in Alabama; Alcorn County, Tishomingo County, Mississippi; 29 counties in Tennessee

The Storm Prediction Center issued this mesoscale discussion at Apr 6, 2005, 4:53 PM CDT for 25 counties in Alabama; Alcorn County, Tishomingo County, Mississippi; 29 counties in Tennessee. It was in force for 37 min.

The area

The outline as issued.

The facts

Issued
Apr 6, 2005, 4:53 PM CDT (21:53 UTC)
Expired
Apr 6, 2005, 5:30 PM CDT
In force
37 min
Issued by
the Storm Prediction Center
All 56 counties

Bibb County, AL, Blount County, AL, Chilton County, AL, Colbert County, AL, Coosa County, AL, Cullman County, AL, Fayette County, AL, Franklin County, AL, Greene County, AL, Jefferson County, AL, Lamar County, AL, Lauderdale County, AL, Lawrence County, AL, Limestone County, AL, Madison County, AL, Marion County, AL, Marshall County, AL, Morgan County, AL, Pickens County, AL, Shelby County, AL, St. Clair County, AL, Talladega County, AL, Tuscaloosa County, AL, Walker County, AL, Winston County, AL, Alcorn County, MS, Tishomingo County, MS, 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, Gibson County, TN, Giles County, TN, Hardin 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, Madison County, TN, Marshall County, TN, Maury County, TN, McNairy County, TN, Moore County, TN, Perry County, TN, Rutherford County, TN, Wayne County, TN, Williamson County, TN

The radar

The Columbus AFB radar (KGWX), 101 km from the middle of the area, began a volume at 21:57 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

Birmingham, AL (KBMX), launched 12:00Z, 9.9 hours before the alert went out and 180 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, Birmingham, AL at 12:00Z on 2005-04-06Temperature 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, Birmingham, AL at 12:00Z on 2005-04-06The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 148 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
1203 m above ground
0-6 km bulk shear
39 kt
0-1 km storm-relative helicity
148 m²/s²
0-3 km storm-relative helicity
162 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, 7:00 AM CDTTornado WatchSPCChoctaw, Greene, Mobile, Pickens, Sumter, Washington6 hr
Apr 6, 9:29 AM CDTMesoscale DiscussionSPCChoctaw, Greene, Mobile, Pickens, Sumter, Washington2 hr
Apr 6, 10:50 AM CDTMesoscale DiscussionSPCBaldwin, Butler, Clarke, Coffee, Conecuh, Covington and 9 more55 min
Apr 6, 11:05 AM CDTTornado WatchSPCAutauga, Baldwin, Bullock, Butler, Choctaw, Clarke and 20 more8 hr
Apr 6, 1:21 PM CDTMesoscale DiscussionSPCAutauga, Baldwin, Bullock, Butler, Choctaw, Clarke and 20 more84 min
Apr 6, 3:43 PM CDTMesoscale DiscussionSPCAutauga, Baldwin, Bullock, Butler, Choctaw, Clarke and 20 more92 min
Apr 6, 5:20 PM CDTTornado WatchSPCBibb, Chilton, Cullman, Fayette, Greene, Hale and 8 more8 hr
Apr 6, 6:01 PM CDTMesoscale DiscussionSPCAutauga, Baldwin, Bullock, Butler, Choctaw, Clarke and 21 more59 min
Apr 6, 6:45 PM CDTTornado WatchSPCAutauga, Bibb, Butler, Chilton, Choctaw, Clarke and 20 more6 hr
Apr 5, 10:40 PM CDTMesoscale DiscussionSPCAdams, Amite, Claiborne, Copiah, Covington, Franklin and 16 more2 hr
Apr 6, 2:55 AM CDTTornado WatchSPCAdams, Amite, Claiborne, Clarke, Copiah, Covington and 26 more7 hr
Apr 6, 5:45 AM CDTMesoscale DiscussionSPCAdams, Amite, Attala, Carroll, Choctaw, Claiborne and 36 more90 min
Apr 6, 7:46 AM CDTMesoscale DiscussionSPCBolivar, Issaquena, Washington119 min
Apr 6, 10:40 AM CDTMesoscale DiscussionSPCAttala, Bolivar, Carroll, Claiborne, Hinds, Holmes and 11 more65 min
Apr 6, 11:05 AM CDTTornado WatchSPCAdams, Amite, Attala, Bolivar, Calhoun, Carroll and 51 more8 hr
Apr 6, 1:55 PM CDTTornado WatchSPCBenton, Calhoun, Chickasaw, Coahoma, DeSoto, Lafayette and 12 more7 hr
Apr 6, 3:18 PM CDTMesoscale DiscussionSPCBenton, Calhoun, Chickasaw, Coahoma, DeSoto, Lafayette and 12 more87 min
Apr 6, 5:44 PM CDTMesoscale DiscussionSPCBenton, Calhoun, Chickasaw, Coahoma, DeSoto, Lafayette and 12 more91 min

Nearby

Mesoscale Discussions in Tennessee, 2005Mesoscale Discussions in Alabama, 2005Mesoscale Discussions in Mississippi, 2005Every mesoscale discussion in 2005

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.