Alert archive / Alabama / Mesoscale Discussions in 2007

Mesoscale Discussion 30

January 7, 200745 counties in Alabama; 14 counties in Georgia; 7 counties in Mississippi

The Storm Prediction Center issued this mesoscale discussion at Jan 7, 2007, 11:31 AM CST for 45 counties in Alabama; 14 counties in Georgia; 7 counties in Mississippi. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued: Jan 7, 2007, 11:31 AM CST (17:31 UTC)
Expired: Jan 7, 2007, 2:00 PM CST
In force: 2 hr
Issued by: the Storm Prediction Center

All 66 counties

Autauga County, AL, Barbour County, AL, Bibb County, AL, Blount County, AL, Bullock County, AL, Butler County, AL, Calhoun County, AL, Chambers County, AL, Chilton County, AL, Choctaw County, AL, Clarke County, AL, Clay County, AL, Cleburne County, AL, Coffee County, AL, Conecuh County, AL, Coosa County, AL, Covington County, AL, Crenshaw County, AL, Cullman County, AL, Dale County, AL, Dallas County, AL, Elmore County, AL, Escambia County, AL, Greene County, AL, Hale County, AL, Jefferson County, AL, Lee County, AL, Lowndes County, AL, Macon County, AL, Marengo County, AL, Monroe County, AL, Montgomery County, AL, Perry County, AL, Pike County, AL, Randolph County, AL, Russell County, AL, Shelby County, AL, St. Clair County, AL, Sumter County, AL, Talladega County, AL, Tallapoosa County, AL, Tuscaloosa County, AL, Walker County, AL, Washington County, AL, Wilcox County, AL, Carroll County, GA, Chattahoochee County, GA, Clayton County, GA, Coweta County, GA, Douglas County, GA, Fayette County, GA, Haralson County, GA, Harris County, GA, Heard County, GA, Meriwether County, GA, Muscogee County, GA, Pike County, GA, Talbot County, GA, Troup County, GA, Clarke County, MS, Forrest County, MS, George County, MS, Greene County, MS, Lauderdale County, MS, Perry County, MS, Wayne County, MS

The radar

The Birmingham radar (KBMX), 44 km from the middle of the area, began a volume at 17:34 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.

The nearest sounding before it

Birmingham, AL (KBMX), launched 12:00Z, 5.5 hours before the alert went out and 45 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 446 m above ground
0-6 km bulk shear: 50 kt
0-1 km storm-relative helicity: 244 m²/s²
0-3 km storm-relative helicity: 317 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.2

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
Jan 7, 12:26 PM CST	Tornado Watch	SPC	Autauga, Baldwin, Bibb, Blount, Butler, Calhoun and 38 more	6 hr
Jan 7, 2:51 PM CST	Mesoscale Discussion	SPC	Autauga, Baldwin, Barbour, Bibb, Bullock, Butler and 36 more	84 min
Jan 7, 3:12 PM CST	Tornado Watch	SPC	Barbour, Bullock, Chambers, Coffee, Covington, Dale and 7 more	7 hr
Jan 7, 5:34 PM CST	Mesoscale Discussion	SPC	Barrow, Clarke, DeKalb, Elbert, Forsyth, Fulton and 13 more	86 min

Nearby

Mesoscale Discussions in Alabama, 2007 Mesoscale Discussions in Georgia, 2007 Mesoscale Discussions in Mississippi, 2007 Every 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.