Alert archive / Tennessee / Mesoscale Discussions in 2006

Mesoscale Discussion 598

April 21, 20066 states

The Storm Prediction Center issued this mesoscale discussion at Apr 21, 2006, 2:15 AM CDT for 6 states. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued
Apr 21, 2006, 2:15 AM CDT (07:15 UTC)
Expired
Apr 21, 2006, 4:15 AM CDT
In force
2 hr
Issued by
the Storm Prediction Center
All 116 counties

Blount County, AL, Cherokee County, AL, Colbert County, AL, Cullman County, AL, DeKalb County, AL, Etowah County, AL, Franklin County, AL, Jackson County, AL, Jefferson County, AL, Lauderdale County, AL, Lawrence County, AL, Limestone County, AL, Madison County, AL, Marshall County, AL, Morgan County, AL, St. Clair County, AL, Tuscaloosa County, AL, Walker County, AL, Winston County, AL, Arkansas County, AR, Ashley County, AR, Bradley County, AR, Chicot County, AR, Desha County, AR, Drew County, AR, Lee County, AR, Lincoln County, AR, Monroe County, AR, Phillips County, AR, St. Francis County, AR, Catoosa County, GA, Chattooga County, GA, Dade County, GA, Murray County, GA, Walker County, GA, Whitfield County, GA, Lincoln Parish, LA, Union Parish, LA, 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, Leflore County, MS, Marshall County, MS, Panola County, MS, Pontotoc County, MS, Prentiss County, MS, Quitman County, MS, Sunflower County, MS, Tallahatchie County, MS, Tate County, MS, Tippah County, MS, Tishomingo County, MS, Tunica County, MS, Union County, MS, Washington County, MS, Yalobusha County, MS, Bedford County, TN, Bledsoe County, TN, Bradley County, TN, Cannon County, TN, Chester County, TN, Clay County, TN, Coffee County, TN, Cumberland County, TN, Davidson County, TN, Decatur County, TN, DeKalb County, TN, Fayette County, TN, Fentress 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, Jackson County, TN, Lawrence County, TN, Lewis County, TN, Lincoln County, TN, Loudon County, TN, Madison County, TN, Marion County, TN, Marshall County, TN, Maury County, TN, McMinn County, TN, McNairy County, TN, Meigs County, TN, Monroe County, TN, Moore County, TN, Morgan County, TN, Overton County, TN, Perry County, TN, Polk County, TN, Putnam County, TN, Rhea County, TN, Roane County, TN, Rutherford County, TN, Sequatchie County, TN, Shelby County, TN, Smith 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 Columbus AFB radar (KGWX), 43 km from the middle of the area, began a volume at 07:15 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 nearest sounding before it

Little Rock, AR (KLZK), launched 00:00Z, 7.3 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, Little Rock, AR at 00:00Z on 2006-04-21Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 512 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, Little Rock, AR at 00:00Z on 2006-04-21The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 69 square meters per square second.19395878Sfc1 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
512 J/kg
Mixed-layer CIN
-90 J/kg
Mixed-layer LCL
1181 m above ground
0-6 km bulk shear
21 kt
0-1 km storm-relative helicity
69 m²/s²
0-3 km storm-relative helicity
130 m²/s²
Significant tornado parameter
0.0
Supercell composite
1.0

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 20, 7:55 PM CDTMesoscale DiscussionSPCCherokee, Clay, Cleburne, Randolph2 hr
Apr 20, 10:53 PM CDTMesoscale DiscussionSPCAutauga, Bibb, Blount, Chilton, Colbert, Cullman and 14 more97 min
Apr 21, 5:00 AM CDTMesoscale DiscussionSPCColbert, Franklin, Lauderdale, Lawrence, Limestone, Marion and 2 more60 min
Apr 21, 12:17 PM CDTMesoscale DiscussionSPCBibb, Blount, Calhoun, Cherokee, Chilton, Clay and 17 more88 min
Apr 21, 12:52 PM CDTMesoscale DiscussionSPCBaldwin, Choctaw, Clarke, Dallas, Greene, Hale and 7 more83 min
Apr 21, 1:24 PM CDTSevere Thunderstorm WatchSPCAutauga, Baldwin, Bibb, Blount, Butler, Calhoun and 45 more8 hr
Apr 21, 3:39 PM CDTMesoscale DiscussionSPCAutauga, Barbour, Bibb, Bullock, Butler, Calhoun and 37 more66 min
Apr 20, 7:35 PM CDTMesoscale DiscussionSPCArkansas, Chicot, Desha, Drew, Lincoln85 min
Apr 20, 9:31 PM CDTMesoscale DiscussionSPCArkansas, Bradley, Calhoun, Clark, Cleveland, Craighead and 29 more89 min
Apr 20, 10:00 PM CDTSevere Thunderstorm WatchSPCArkansas, Ashley, Bradley, Calhoun, Chicot, Clark and 33 more7 hr
Apr 21, 3:33 PM CDTTornado WatchSPCBartow, Catoosa, Chattooga, Cherokee, Dade, Dawson and 12 more6 hr
Apr 21, 6:22 PM CDTMesoscale DiscussionSPCColumbia, Elbert, Franklin, Hart, Lincoln, McDuffie and 7 more83 min
Apr 20, 11:26 PM CDTMesoscale DiscussionSPCBeauregard, Bienville, Caldwell, De Soto, Franklin, Grant and 10 more94 min
Apr 21, 9:51 AM CDTMesoscale DiscussionSPCAcadia, Ascension, Assumption, Avoyelles, Concordia, East Baton Rouge and 23 more84 min
Apr 21, 10:16 AM CDTSevere Thunderstorm WatchSPCAcadia, Ascension, Assumption, Avoyelles, Catahoula, Concordia and 30 more6 hr
Apr 21, 12:04 AM CDTMesoscale DiscussionSPCAlcorn, Benton, Itawamba, Lafayette, Lee, Marshall and 8 more116 min

Nearby

Mesoscale Discussions in Tennessee, 2006Mesoscale Discussions in Mississippi, 2006Mesoscale Discussions in Alabama, 2006Every mesoscale discussion in 2006

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.