Alert archive / Alabama / Mesoscale Discussions in 2008

Mesoscale Discussion 423

March 15, 200818 counties in Alabama; 7 counties in Georgia; Hamilton County, Marion County, Tennessee

The Storm Prediction Center issued this mesoscale discussion at Mar 15, 2008, 2:39 PM CDT for 18 counties in Alabama; 7 counties in Georgia; Hamilton County, Marion County, Tennessee. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued: Mar 15, 2008, 2:39 PM CDT (19:39 UTC)
Expired: Mar 15, 2008, 4:45 PM CDT
In force: 2 hr
Issued by: the Storm Prediction Center

All 27 counties

Bibb County, AL, Blount County, AL, Cullman County, AL, DeKalb County, AL, Fayette County, AL, Franklin County, AL, Jackson County, AL, Jefferson County, AL, Lamar County, AL, Lawrence County, AL, Madison County, AL, Marion County, AL, Marshall County, AL, Morgan County, AL, Pickens County, AL, Tuscaloosa County, AL, Walker County, AL, Winston County, AL, Catoosa County, GA, Chattooga County, GA, Dade County, GA, Gordon County, GA, Murray County, GA, Walker County, GA, Whitfield County, GA, Hamilton County, TN, Marion County, TN

The radar

The Northeast Alabama radar (KHTX), 94 km from the middle of the area, began a volume at 19:41 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

Birmingham, AL (KBMX), launched 12:00Z, 7.7 hours before the alert went out and 116 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 1121 J/kg
Mixed-layer CIN: -89 J/kg
Mixed-layer LCL: 509 m above ground
0-6 km bulk shear: 66 kt
0-1 km storm-relative helicity: 393 m²/s²
0-3 km storm-relative helicity: 622 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 7.3

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.

Issued	Product	Office	Counties	Lasted
Mar 14, 7:11 PM CDT	Mesoscale Discussion	SPC	Autauga, Barbour, Blount, Bullock, Calhoun, Chambers and 18 more	64 min
Mar 15, 12:39 AM CDT	Mesoscale Discussion	SPC	Blount, Calhoun, Cherokee, Clay, Cleburne, Colbert and 22 more	66 min
Mar 15, 12:56 AM CDT	Severe Thunderstorm Watch	SPC	Autauga, Bibb, Blount, Calhoun, Chambers, Cherokee and 38 more	6 hr
Mar 15, 2:57 AM CDT	Mesoscale Discussion	SPC	Cherokee, Cleburne, Randolph	93 min
Mar 15, 4:30 AM CDT	Mesoscale Discussion	SPC	Colbert, Franklin, Marion	90 min
Mar 15, 6:58 AM CDT	Mesoscale Discussion	SPC	Blount, Cherokee, Colbert, Cullman, DeKalb, Etowah and 11 more	62 min
Mar 15, 7:02 AM CDT	Severe Thunderstorm Watch	SPC	Blount, Calhoun, Cherokee, Cleburne, Colbert, Cullman and 16 more	4 hr
Mar 15, 9:38 AM CDT	Mesoscale Discussion	SPC	Calhoun, Cherokee, Cleburne, DeKalb, Etowah, Randolph and 1 more	67 min
Mar 15, 10:02 AM CDT	Tornado Watch	SPC	Autauga, Bullock, Calhoun, Chambers, Cherokee, Chilton and 15 more	8 hr
Mar 15, 10:23 AM CDT	Mesoscale Discussion	SPC	Colbert	67 min
Mar 15, 12:22 PM CDT	Mesoscale Discussion	SPC	Bullock, Calhoun, Chambers, Clay, Cleburne, Coosa and 8 more	83 min
Mar 15, 1:21 PM CDT	Mesoscale Discussion	SPC	Calhoun, Chambers, Clay, Cleburne, Randolph	84 min
Mar 15, 2:08 PM CDT	Mesoscale Discussion	SPC	Cleburne	67 min
Mar 14, 10:03 PM CDT	Mesoscale Discussion	SPC	Baldwin, Butts, Clayton, Cobb, DeKalb, Douglas and 26 more	57 min
Mar 15, 3:28 AM CDT	Severe Thunderstorm Watch	SPC	Banks, Barrow, Bartow, Butts, Carroll, Chattooga and 42 more	3 hr
Mar 15, 6:18 AM CDT	Mesoscale Discussion	SPC	Burke, Columbia, Glascock, Hancock, Jefferson, Jenkins and 7 more	117 min
Mar 15, 3:36 PM CDT	Tornado Watch PDS	SPC	Baldwin, Barrow, Bibb, Bleckley, Bryan, Bulloch and 73 more	8 hr
Mar 15, 4:56 PM CDT	Mesoscale Discussion	SPC	Appling, Atkinson, Bacon, Ben Hill, Berrien, Bleckley and 40 more	64 min
Mar 15, 5:17 PM CDT	Mesoscale Discussion	SPC	Banks, Bartow, Cherokee, Cobb, Dawson, Floyd and 14 more	28 min
Mar 15, 6:41 PM CDT	Mesoscale Discussion	SPC	Baldwin, Bibb, Bleckley, Bulloch, Burke, Butts and 52 more	64 min
Mar 14, 11:55 PM CDT	Severe Thunderstorm Watch	SPC	Carroll, Chester, Crockett, Decatur, Dyer, Fayette and 14 more	7 hr
Mar 15, 2:12 AM CDT	Mesoscale Discussion	SPC	Chester, Crockett, Dyer, Fayette, Gibson, Hardeman and 6 more	93 min

Nearby

Mesoscale Discussions in Alabama, 2008 Mesoscale Discussions in Georgia, 2008 Mesoscale Discussions in Tennessee, 2008 Every mesoscale discussion in 2008

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.