Alert archive / Georgia / Mesoscale Discussions in 2009
Mesoscale Discussion 101
The Storm Prediction Center issued this mesoscale discussion at Feb 11, 2009, 1:29 PM CST for 5 states. It was in force for 2 hr.
The area
The outline as issued.
The facts
- Issued
- Feb 11, 2009, 1:29 PM CST (19:29 UTC)
- Expired
- Feb 11, 2009, 3:30 PM CST
- In force
- 2 hr
- Issued by
- the Storm Prediction Center
All 89 counties
Bibb County, AL, Blount County, AL, Calhoun County, AL, Chambers County, AL, Cherokee County, AL, Chilton County, AL, Clay County, AL, Cleburne County, AL, Coosa County, AL, DeKalb County, AL, Etowah County, AL, Jackson County, AL, Jefferson County, AL, Marshall County, AL, Randolph County, AL, Shelby County, AL, St. Clair County, AL, Talladega County, AL, Tallapoosa County, AL, Banks County, GA, Barrow County, GA, Bartow 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, Dade County, GA, Dawson County, GA, DeKalb County, GA, Douglas County, GA, Fannin County, GA, Fayette County, GA, Floyd County, GA, Forsyth County, GA, Franklin County, GA, Fulton County, GA, Gilmer County, GA, Gordon County, GA, Gwinnett County, GA, Habersham County, GA, Hall County, GA, Haralson County, GA, Hart County, GA, Heard County, GA, Henry County, GA, Jackson County, GA, Jasper 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, Paulding County, GA, Pickens County, GA, Pike County, GA, Polk County, GA, Rabun County, GA, Rockdale County, GA, Spalding County, GA, Stephens County, GA, Towns County, GA, Troup County, GA, Union County, GA, Upson County, GA, Walker County, GA, Walton County, GA, White County, GA, Whitfield County, GA, Cherokee County, NC, Clay County, NC, Jackson County, NC, Macon County, NC, Transylvania County, NC, Oconee County, SC, Pickens County, SC, Bradley County, TN, Franklin County, TN, Hamilton County, TN, Marion County, TN, Polk County, TN
The radar
The Atlanta radar (KFFC), 84 km from the middle of the area, began a volume at 19:33 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
Peachtre/Fal Fld, GA (KFFC), launched 12:00Z, 7.5 hours before the alert went out and 89 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.
- Mixed-layer CAPE
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 841 m above ground
- 0-6 km bulk shear
- 66 kt
- 0-1 km storm-relative helicity
- 330 m²/s²
- 0-3 km storm-relative helicity
- 366 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
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</html>SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Feb 11, 9:36 AM CST | Mesoscale Discussion | SPC | Autauga, Baldwin, Barbour, Bullock, Butler, Chambers and 26 more | 84 min |
| Feb 11, 10:02 AM CST | Mesoscale Discussion | SPC | Cullman, DeKalb, Jackson, Lawrence, Limestone, Madison and 3 more | 88 min |
| Feb 11, 11:10 AM CST | Tornado Watch | SPC | Bibb, Blount, Calhoun, Chambers, Cherokee, Chilton and 19 more | 6 hr |
| Feb 11, 3:08 PM CST | Severe Thunderstorm Watch | SPC | Banks, Barrow, Butts, Clarke, Clayton, Cobb and 34 more | 5 hr |
| Feb 11, 12:59 PM CST | Tornado Watch | SPC | Cherokee, Clay | 7 hr |
| Feb 11, 3:34 PM CST | Mesoscale Discussion | SPC | Avery, Buncombe, Haywood, McDowell, Madison, Mitchell and 2 more | 86 min |
| Feb 11, 4:53 PM CST | Severe Thunderstorm Watch | SPC | Alleghany, Ashe, Stokes, Surry, Watauga, Wilkes and 1 more | 4 hr |
| Feb 10, 11:45 PM CST | Tornado Watch | SPC | Dyer, Lake, Lauderdale, Obion, Shelby, Tipton | 6 hr |
| Feb 11, 2:30 AM CST | Mesoscale Discussion | SPC | Crockett, Dyer, Fayette, Gibson, Haywood, Lake and 5 more | 90 min |
| Feb 11, 5:26 AM CST | Mesoscale Discussion | SPC | Dyer, Lake, Lauderdale, Obion, Tipton | 64 min |
| Feb 11, 10:38 AM CST | Tornado Watch | SPC | Bedford, Cannon, Cheatham, Clay, Coffee, Cumberland and 21 more | 6 hr |
| Feb 11, 12:35 PM CST | Mesoscale Discussion | SPC | Anderson, Bedford, Bledsoe, Blount, Campbell, Cannon and 39 more | 85 min |
Nearby
Mesoscale Discussions in Georgia, 2009Mesoscale Discussions in Alabama, 2009Mesoscale Discussions in North Carolina, 2009Every mesoscale discussion in 2009
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.