Alert archive / Georgia / Mesoscale Discussions in 2007

Mesoscale Discussion 1343

July 1, 20077 counties in Alabama; 54 counties in Georgia

The Storm Prediction Center issued this mesoscale discussion at Jul 1, 2007, 3:20 PM CDT for 7 counties in Alabama; 54 counties in Georgia. It was in force for 55 min.

The area

The outline as issued.

The facts

Issued: Jul 1, 2007, 3:20 PM CDT (20:20 UTC)
Expired: Jul 1, 2007, 4:15 PM CDT
In force: 55 min
Issued by: the Storm Prediction Center

All 61 counties

Calhoun County, AL, Cherokee County, AL, Cleburne County, AL, DeKalb County, AL, Etowah County, AL, Randolph County, AL, St. Clair County, AL, Banks County, GA, Barrow County, GA, Bartow County, GA, Bibb County, GA, Butts County, GA, Carroll County, GA, Catoosa County, GA, Chattooga County, GA, Cherokee County, GA, Clarke County, GA, Clayton County, GA, Cobb County, GA, Coweta County, GA, Crawford County, GA, Dawson County, GA, DeKalb County, GA, Douglas County, GA, Fayette County, GA, Floyd County, GA, Forsyth County, GA, Fulton County, GA, Gilmer County, GA, Gordon County, GA, Gwinnett County, GA, Hall County, GA, Haralson County, GA, Heard County, GA, Henry County, GA, Jackson County, GA, Jasper County, GA, Jones County, GA, Lamar County, GA, Lumpkin County, GA, Madison County, GA, Meriwether County, GA, Monroe County, GA, Morgan County, GA, Murray County, GA, Newton County, GA, Oconee County, GA, Oglethorpe County, GA, Paulding County, GA, Pickens County, GA, Pike County, GA, Polk County, GA, Putnam County, GA, Rockdale County, GA, Spalding County, GA, Talbot County, GA, Troup County, GA, Upson County, GA, Walker County, GA, Walton County, GA, Whitfield County, GA

The radar

The Atlanta radar (KFFC), 62 km from the middle of the area, began a volume at 20:23 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

Peachtre/Fal Fld, GA (KFFC), launched 12:00Z, 8.3 hours before the alert went out and 64 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: 34 J/kg
Mixed-layer CIN: -220 J/kg
Mixed-layer LCL: 1436 m above ground
0-6 km bulk shear: 9 kt
0-1 km storm-relative helicity: 18 m²/s²
0-3 km storm-relative helicity: 30 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

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
Jul 1, 11:12 AM CDT	Mesoscale Discussion	SPC	Blount, Calhoun, Chambers, Cherokee, Clay, Cleburne and 22 more	2 hr
Jul 1, 12:10 PM CDT	Severe Thunderstorm Watch	SPC	Blount, Calhoun, Cherokee, Clay, Cleburne, Colbert and 16 more	8 hr
Jul 1, 2:09 PM CDT	Mesoscale Discussion	SPC	Lamar	66 min
Jul 1, 5:16 PM CDT	Mesoscale Discussion	SPC	Calhoun, Chambers, Cherokee, Clay, Cleburne, Etowah and 2 more	119 min

Nearby

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