Alert archive / Alabama / Mesoscale Discussions in 2007

Mesoscale Discussion 455

April 11, 200732 counties in Alabama; 25 counties in Mississippi; 16 counties in Tennessee

The Storm Prediction Center issued this mesoscale discussion at Apr 11, 2007, 12:16 PM CDT for 32 counties in Alabama; 25 counties in Mississippi; 16 counties in Tennessee. It was in force for 59 min.

The area

The outline as issued.

The facts

Issued
Apr 11, 2007, 12:16 PM CDT (17:16 UTC)
Expired
Apr 11, 2007, 1:15 PM CDT
In force
59 min
Issued by
the Storm Prediction Center
All 73 counties

Autauga County, AL, Bibb County, AL, Blount County, AL, Chilton County, AL, Choctaw County, AL, Colbert County, AL, Coosa County, AL, Cullman County, AL, Dallas County, AL, Fayette County, AL, Franklin County, AL, Greene County, AL, Hale County, AL, Jefferson County, AL, Lamar County, AL, Lauderdale County, AL, Lawrence County, AL, Limestone County, AL, Madison County, AL, Marengo County, AL, Marion County, AL, Marshall County, AL, Morgan County, AL, Perry County, AL, Pickens County, AL, Shelby County, AL, St. Clair County, AL, Sumter County, AL, Talladega County, AL, Tuscaloosa County, AL, Walker County, AL, Winston County, AL, Alcorn County, MS, Attala County, MS, Chickasaw County, MS, Choctaw County, MS, Clarke County, MS, Clay County, MS, Itawamba County, MS, Kemper County, MS, Lauderdale County, MS, Leake County, MS, Lee County, MS, Lowndes County, MS, Monroe County, MS, Neshoba County, MS, Newton County, MS, Noxubee County, MS, Oktibbeha County, MS, Pontotoc County, MS, Prentiss County, MS, Scott County, MS, Tippah County, MS, Tishomingo County, MS, Union County, MS, Webster County, MS, Winston County, MS, Bedford County, TN, Decatur County, TN, Giles County, TN, Hardin County, TN, Henderson County, TN, Hickman County, TN, Lawrence County, TN, Lewis County, TN, Lincoln County, TN, Marshall County, TN, Maury County, TN, McNairy County, TN, Moore County, TN, Perry County, TN, Wayne County, TN, Williamson County, TN

The radar

The Columbus AFB radar (KGWX), 69 km from the middle of the area, began a volume at 17:33 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, 5.3 hours before the alert went out and 96 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 2007-04-11Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1 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, Birmingham, AL at 12:00Z on 2007-04-11The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 342 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
1 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
501 m above ground
0-6 km bulk shear
51 kt
0-1 km storm-relative helicity
342 m²/s²
0-3 km storm-relative helicity
389 m²/s²
Significant tornado parameter
0.0
Supercell composite
-0.3

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
Apr 11, 1:42 PM CDTTornado WatchSPCAutauga, Bibb, Blount, Chilton, Colbert, Coosa and 30 more5 hr
Apr 11, 1:44 PM CDTMesoscale DiscussionSPCButler, Coffee, Conecuh, Covington, Crenshaw, Dale and 4 more61 min
Apr 11, 3:27 PM CDTMesoscale DiscussionSPCAutauga, Barbour, Bibb, Blount, Bullock, Butler and 46 more63 min
Apr 11, 3:48 PM CDTTornado WatchSPCBarbour, Bullock, Butler, Calhoun, Chambers, Cherokee and 15 more6 hr
Apr 11, 6:23 PM CDTMesoscale DiscussionSPCBarbour, Bullock, Butler, Calhoun, Chambers, Cherokee and 24 more97 min
Apr 11, 2:19 AM CDTMesoscale DiscussionSPCBolivar, Coahoma, Humphreys, Issaquena, Leflore, Quitman and 4 more116 min
Apr 11, 2:56 AM CDTSevere Thunderstorm WatchSPCAttala, Benton, Bolivar, Calhoun, Carroll, Chickasaw and 29 more5 hr
Apr 11, 4:36 AM CDTMesoscale DiscussionSPCAttala, Benton, Calhoun, Carroll, Chickasaw, Choctaw and 26 more114 min
Apr 11, 7:30 AM CDTMesoscale DiscussionSPCAttala, Calhoun, Carroll, Chickasaw, Choctaw, Clay and 9 more60 min

Nearby

Mesoscale Discussions in Alabama, 2007Mesoscale Discussions in Mississippi, 2007Mesoscale Discussions in Tennessee, 2007Every mesoscale discussion in 2007

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.