Alert archive / Mississippi / Mesoscale Discussions in 2006

Mesoscale Discussion 600

April 21, 20068 counties in Alabama; 18 counties in Mississippi; 11 counties in Tennessee

The Storm Prediction Center issued this mesoscale discussion at Apr 21, 2006, 5:00 AM CDT for 8 counties in Alabama; 18 counties in Mississippi; 11 counties in Tennessee. It was in force for 60 min.

The area

The outline as issued.

The facts

Issued
Apr 21, 2006, 5:00 AM CDT (10:00 UTC)
Expired
Apr 21, 2006, 6:00 AM CDT
In force
60 min
Issued by
the Storm Prediction Center
Concerning
Severe thunderstorm watch 229
All 37 counties

Colbert County, AL, Franklin County, AL, Lauderdale County, AL, Lawrence County, AL, Limestone County, AL, Marion County, AL, Morgan County, AL, Winston County, AL, Alcorn County, MS, Benton County, MS, Calhoun County, MS, Chickasaw County, MS, DeSoto County, MS, Itawamba County, MS, Lafayette County, MS, Lee County, MS, Marshall County, MS, Monroe County, MS, Panola County, MS, Pontotoc County, MS, Prentiss County, MS, Tate County, MS, Tippah County, MS, Tishomingo County, MS, Union County, MS, Yalobusha County, MS, Chester County, TN, Decatur County, TN, Fayette County, TN, Giles County, TN, Hardeman County, TN, Hardin County, TN, Lawrence County, TN, Lewis County, TN, McNairy County, TN, Shelby County, TN, Wayne County, TN

The radar

The Columbus AFB radar (KGWX), 87 km from the middle of the area, began a volume at 10:00 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, 10.0 hours before the alert went out and 139 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, 2:15 AM CDTMesoscale DiscussionSPCBlount, Cherokee, Colbert, Cullman, DeKalb, Etowah and 13 more2 hr
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 DiscussionSPCAttala, Bolivar, Calhoun, Carroll, Chickasaw, Choctaw and 26 more85 min
Apr 20, 9:31 PM CDTMesoscale DiscussionSPCAlcorn, Benton, Coahoma, DeSoto, Lafayette, Marshall and 5 more89 min
Apr 20, 10:00 PM CDTSevere Thunderstorm WatchSPCAlcorn, Benton, Bolivar, Coahoma, DeSoto, Lafayette and 15 more7 hr
Apr 21, 12:04 AM CDTMesoscale DiscussionSPCAlcorn, Benton, Itawamba, Lafayette, Lee, Marshall and 8 more116 min
Apr 21, 9:51 AM CDTMesoscale DiscussionSPCAdams, Amite, Attala, Claiborne, Copiah, Covington and 25 more84 min
Apr 21, 10:16 AM CDTSevere Thunderstorm WatchSPCAdams, Amite, Claiborne, Clarke, Copiah, Covington and 27 more6 hr
Apr 21, 3:33 PM CDTTornado WatchSPCAnderson, Bledsoe, Blount, Bradley, Campbell, Claiborne and 17 more6 hr
Apr 21, 6:22 PM CDTMesoscale DiscussionSPCCocke, Greene, Unicoi83 min

Nearby

Mesoscale Discussions in Mississippi, 2006Mesoscale Discussions in Tennessee, 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.