Alert archive / Alabama / Mesoscale Discussions in 2008

Mesoscale Discussion 863

May 10, 200812 counties in Alabama; 8 counties in Mississippi

The Storm Prediction Center issued this mesoscale discussion at May 10, 2008, 2:28 PM CDT for 12 counties in Alabama; 8 counties in Mississippi. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued: May 10, 2008, 2:28 PM CDT (19:28 UTC)
Expired: May 10, 2008, 4:30 PM CDT
In force: 2 hr
Issued by: the Storm Prediction Center

Counties Bibb County, AL, Clay County, AL, Fayette County, AL, Jefferson County, AL, Lamar County, AL, Pickens County, AL, Randolph County, AL, Shelby County, AL, St. Clair County, AL, Talladega County, AL, Tuscaloosa County, AL, Walker County, AL, Choctaw County, MS, Clay County, MS, Lowndes County, MS, Monroe County, MS, Noxubee County, MS, Oktibbeha County, MS, Webster County, MS, Winston County, MS

The radar

The Birmingham radar (KBMX), 55 km from the middle of the area, began a volume at 19:30 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.

Tornado Watch 298May 10, 4:25 PM CDT

The nearest sounding before it

Peachtre/Fal Fld, GA (KFFC), launched 12:00Z, 7.5 hours before the alert went out and 251 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: 1694 J/kg
Mixed-layer CIN: -10 J/kg
Mixed-layer LCL: 500 m above ground
0-6 km bulk shear: 52 kt
0-1 km storm-relative helicity: 44 m²/s²
0-3 km storm-relative helicity: 211 m²/s²
Significant tornado parameter: 1.4
Supercell composite: 5.5

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
May 9, 11:08 PM CDT	Mesoscale Discussion	SPC	Blount, Calhoun, Cherokee, Cleburne, Colbert, Cullman and 19 more	2 hr
May 10, 4:05 AM CDT	Mesoscale Discussion	SPC	Calhoun, Cherokee, Cleburne, DeKalb, Etowah, Jackson and 6 more	115 min
May 10, 11:28 AM CDT	Mesoscale Discussion	SPC	Bullock, Chambers, Lee, Macon, Russell, Tallapoosa	3 hr
May 10, 9:40 AM CDT	Mesoscale Discussion	SPC	Attala, Bolivar, Calhoun, Carroll, Choctaw, Coahoma and 19 more	65 min
May 10, 10:11 AM CDT	Tornado Watch	SPC	Bolivar, Carroll, Claiborne, Copiah, Grenada, Hinds and 12 more	5 hr
May 10, 2:23 PM CDT	Mesoscale Discussion	SPC	Bolivar, Carroll, Claiborne, Copiah, Hinds, Holmes and 10 more	97 min
May 10, 3:36 PM CDT	Tornado Watch PDS	SPC	Bolivar, Carroll, Grenada, Holmes, Humphreys, Leflore and 2 more	4 hr
May 10, 4:27 PM CDT	Tornado Watch	SPC	Alcorn, Benton, Calhoun, Chickasaw, Coahoma, DeSoto and 16 more	10 hr
May 10, 6:22 PM CDT	Mesoscale Discussion	SPC	Alcorn, Benton, Bolivar, Calhoun, Coahoma, DeSoto and 16 more	83 min
May 10, 6:51 PM CDT	Tornado Watch PDS	SPC	Bolivar, Carroll, Grenada, Holmes, Humphreys, Leflore and 2 more	7 hr

Nearby

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