Alert archive / Alabama / Mesoscale Discussions in 2008

Mesoscale Discussion 416

March 15, 200817 counties in Alabama; Tishomingo County, Mississippi

The Storm Prediction Center issued this mesoscale discussion at Mar 15, 2008, 6:58 AM CDT for 17 counties in Alabama; Tishomingo County, Mississippi. It was in force for 62 min.

The area

The outline as issued.

The facts

Issued
Mar 15, 2008, 6:58 AM CDT (11:58 UTC)
Expired
Mar 15, 2008, 8:00 AM CDT
In force
62 min
Issued by
the Storm Prediction Center

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, Lauderdale County, AL, Lawrence County, AL, Limestone County, AL, Madison County, AL, Marion County, AL, Marshall County, AL, Morgan County, AL, St. Clair County, AL, Winston County, AL, Tishomingo County, MS

The radar

The Northeast Alabama radar (KHTX), 100 km from the middle of the area, began a volume at 12:02 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 00:00Z, 12.0 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, Birmingham, AL at 00:00Z on 2008-03-15Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 940 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 00:00Z on 2008-03-15The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 138 square meters per square second.1939587897117136Sfc1 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
940 J/kg
Mixed-layer CIN
-8 J/kg
Mixed-layer LCL
1109 m above ground
0-6 km bulk shear
56 kt
0-1 km storm-relative helicity
138 m²/s²
0-3 km storm-relative helicity
208 m²/s²
Significant tornado parameter
0.8
Supercell composite
3.7

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
Mar 14, 7:11 PM CDTMesoscale DiscussionSPCAutauga, Barbour, Blount, Bullock, Calhoun, Chambers and 18 more64 min
Mar 15, 12:39 AM CDTMesoscale DiscussionSPCBlount, Calhoun, Cherokee, Clay, Cleburne, Colbert and 22 more66 min
Mar 15, 12:56 AM CDTSevere Thunderstorm WatchSPCAutauga, Bibb, Blount, Calhoun, Chambers, Cherokee and 38 more6 hr
Mar 15, 2:57 AM CDTMesoscale DiscussionSPCCherokee, Cleburne, Randolph93 min
Mar 15, 4:30 AM CDTMesoscale DiscussionSPCColbert, Franklin, Marion90 min
Mar 15, 7:02 AM CDTSevere Thunderstorm WatchSPCBlount, Calhoun, Cherokee, Cleburne, Colbert, Cullman and 16 more4 hr
Mar 15, 9:38 AM CDTMesoscale DiscussionSPCCalhoun, Cherokee, Cleburne, DeKalb, Etowah, Randolph and 1 more67 min
Mar 15, 10:02 AM CDTTornado WatchSPCAutauga, Bullock, Calhoun, Chambers, Cherokee, Chilton and 15 more8 hr
Mar 15, 10:23 AM CDTMesoscale DiscussionSPCColbert67 min
Mar 15, 12:22 PM CDTMesoscale DiscussionSPCBullock, Calhoun, Chambers, Clay, Cleburne, Coosa and 8 more83 min
Mar 15, 1:21 PM CDTMesoscale DiscussionSPCCalhoun, Chambers, Clay, Cleburne, Randolph84 min
Mar 15, 2:08 PM CDTMesoscale DiscussionSPCCleburne67 min
Mar 15, 2:39 PM CDTMesoscale DiscussionSPCBibb, Blount, Cullman, DeKalb, Fayette, Franklin and 12 more2 hr
Mar 14, 7:14 PM CDTTornado WatchSPCBolivar, Claiborne, Humphreys, Issaquena, Sharkey, Sunflower and 2 more7 hr
Mar 14, 9:50 PM CDTMesoscale DiscussionSPCBolivar, Claiborne, Humphreys, Issaquena, Sharkey, Sunflower and 2 more55 min
Mar 14, 10:36 PM CDTMesoscale DiscussionSPCAttala, Calhoun, Carroll, Chickasaw, Choctaw, Clarke and 24 more84 min
Mar 14, 11:01 PM CDTTornado WatchSPCAttala, Calhoun, Carroll, Chickasaw, Choctaw, Clarke and 27 more3 hr
Mar 14, 11:55 PM CDTMesoscale DiscussionSPCBolivar, Claiborne, Humphreys, Issaquena, Sharkey, Sunflower and 2 more65 min
Mar 14, 11:55 PM CDTSevere Thunderstorm WatchSPCAlcorn, Benton, Coahoma, DeSoto, Itawamba, Lafayette and 11 more7 hr
Mar 15, 1:47 AM CDTMesoscale DiscussionSPCAttala, Carroll, Choctaw, Clarke, Clay, Copiah and 25 more88 min
Mar 15, 2:12 AM CDTMesoscale DiscussionSPCAlcorn, Benton, Coahoma, DeSoto, Lafayette, Lee and 10 more93 min

Nearby

Mesoscale Discussions in Alabama, 2008Mesoscale Discussions in Mississippi, 2008Every 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.