Alert archive / Alabama / Mesoscale Discussions in 2008

Mesoscale Discussion 2437

December 10, 20084 states

The Storm Prediction Center issued this mesoscale discussion at Dec 10, 2008, 3:31 AM CST for 4 states. It was in force for 59 min.

The area

The outline as issued.

The facts

Issued: Dec 10, 2008, 3:31 AM CST (09:31 UTC)
Expired: Dec 10, 2008, 4:30 AM CST
In force: 59 min
Issued by: the Storm Prediction Center

All 55 counties

Autauga County, AL, Baldwin County, AL, Bibb County, AL, Blount County, AL, Butler County, AL, Calhoun County, AL, Chambers County, AL, Cherokee County, AL, Chilton County, AL, Clarke County, AL, Clay County, AL, Cleburne County, AL, Conecuh County, AL, Coosa County, AL, Covington County, AL, Crenshaw County, AL, Dallas County, AL, DeKalb County, AL, Elmore County, AL, Escambia County, AL, Etowah County, AL, Hale County, AL, Jefferson County, AL, Lowndes County, AL, Macon County, AL, Marengo County, AL, Mobile County, AL, Monroe County, AL, Montgomery County, AL, Perry County, AL, Randolph County, AL, Shelby County, AL, St. Clair County, AL, Talladega County, AL, Tallapoosa County, AL, Washington County, AL, Wilcox County, AL, Escambia County, FL, Santa Rosa County, FL, Bartow County, GA, Carroll County, GA, Chattooga County, GA, Floyd County, GA, Gordon County, GA, Haralson County, GA, Heard County, GA, Paulding County, GA, Polk County, GA, George County, MS, Greene County, MS, Hancock County, MS, Harrison County, MS, Jackson County, MS, Perry County, MS, Stone County, MS

The radar

The Mobile radar (KMOB), 152 km from the middle of the area, began a volume at 09:34 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 949Dec 10, 6:45 AM CST

The nearest sounding before it

Birmingham, AL (KBMX), launched 00:00Z, 9.5 hours before the alert went out and 167 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: 167 J/kg
Mixed-layer CIN: -33 J/kg
Mixed-layer LCL: 741 m above ground
0-6 km bulk shear: 49 kt
0-1 km storm-relative helicity: 336 m²/s²
0-3 km storm-relative helicity: 421 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 3.8

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
Dec 9, 6:15 PM CST	Mesoscale Discussion	SPC	Clarke, Escambia, Mobile, Monroe, Washington	90 min
Dec 9, 8:03 PM CST	Tornado Watch	SPC	Baldwin, Bibb, Blount, Choctaw, Clarke, Dallas and 18 more	6 hr
Dec 9, 9:51 PM CST	Mesoscale Discussion	SPC	Autauga, Butler, Chilton, Coosa, Crenshaw, Elmore and 4 more	54 min
Dec 9, 11:42 PM CST	Mesoscale Discussion	SPC	Blount, Chilton, Coosa, Cullman, Jefferson, Marshall and 3 more	63 min
Dec 10, 1:25 AM CST	Mesoscale Discussion	SPC	Autauga, Baldwin, Bibb, Blount, Bullock, Butler and 42 more	65 min
Dec 10, 1:41 AM CST	Tornado Watch	SPC	Autauga, Baldwin, Barbour, Bibb, Blount, Bullock and 40 more	5 hr
Dec 10, 5:29 AM CST	Mesoscale Discussion	SPC	Autauga, Baldwin, Barbour, Bullock, Butler, Calhoun and 31 more	61 min
Dec 10, 6:47 AM CST	Tornado Watch	SPC	Autauga, Baldwin, Barbour, Bullock, Butler, Chambers and 22 more	7 hr
Dec 10, 10:45 AM CST	Mesoscale Discussion	SPC	Barbour, Bullock, Coffee, Covington, Dale, Geneva and 5 more	2 hr
Dec 10, 1:08 PM CST	Mesoscale Discussion	SPC	Houston	67 min
Dec 9, 10:19 PM CST	Mesoscale Discussion	SPC	Amite, Covington, Jasper, Jefferson Davis, Kemper, Lawrence and 12 more	56 min

Nearby

Mesoscale Discussions in Alabama, 2008 Mesoscale Discussions in Georgia, 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.