Alert archive / Georgia / Mesoscale Discussions in 2011
Mesoscale Discussion 648
The Storm Prediction Center issued this mesoscale discussion at Apr 27, 2011, 11:09 PM CDT for 5 states. It was in force for 36 min.
The area
The outline as issued.
The facts
- Issued
- Apr 27, 2011, 11:09 PM CDT (04:09 UTC)
- Expired
- Apr 27, 2011, 11:45 PM CDT
- In force
- 36 min
- Issued by
- the Storm Prediction Center
All 137 counties
Barbour County, AL, Bullock County, AL, Chambers County, AL, Clay County, AL, Cleburne County, AL, Elmore County, AL, Lee County, AL, Macon County, AL, Montgomery County, AL, Pike County, AL, Randolph County, AL, Russell County, AL, Tallapoosa County, AL, Banks County, GA, Barrow County, GA, Bartow County, GA, Bibb County, GA, Butts County, GA, Carroll County, GA, Chattahoochee 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, Elbert 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, Greene County, GA, Gwinnett County, GA, Habersham County, GA, Hall County, GA, Haralson County, GA, Harris County, GA, Hart 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, Marion County, GA, Meriwether County, GA, Monroe County, GA, Morgan County, GA, Murray County, GA, Muscogee 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, Quitman County, GA, Rabun County, GA, Rockdale County, GA, Schley County, GA, Spalding County, GA, Stephens County, GA, Stewart County, GA, Talbot County, GA, Taylor County, GA, Towns County, GA, Troup County, GA, Union County, GA, Upson County, GA, Walton County, GA, Webster County, GA, White County, GA, Wilkes County, GA, Alexander County, NC, Alleghany County, NC, Ashe County, NC, Avery County, NC, Buncombe County, NC, Burke County, NC, Caldwell County, NC, Catawba County, NC, Cherokee County, NC, Clay County, NC, Cleveland County, NC, Davie County, NC, Gaston County, NC, Graham County, NC, Haywood County, NC, Henderson County, NC, Iredell County, NC, Jackson County, NC, Lincoln County, NC, Macon County, NC, Madison County, NC, McDowell County, NC, Mitchell County, NC, Polk County, NC, Rutherford County, NC, Swain County, NC, Transylvania County, NC, Watauga County, NC, Wilkes County, NC, Yadkin County, NC, Yancey County, NC, Abbeville County, SC, Anderson County, SC, Cherokee County, SC, Greenville County, SC, Laurens County, SC, Oconee County, SC, Pickens County, SC, Spartanburg County, SC, Blount County, TN, Carter County, TN, Cocke County, TN, Grainger County, TN, Greene County, TN, Hamblen County, TN, Hancock County, TN, Hawkins County, TN, Jefferson County, TN, Johnson County, TN, Sevier County, TN, Sullivan County, TN, Unicoi County, TN, Washington County, TN
The radar
The Atlanta radar (KFFC), 75 km from the middle of the area, began a volume at 04:12 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 00:00Z, 4.2 hours before the alert went out and 71 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
- 1215 J/kg
- Mixed-layer CIN
- -15 J/kg
- Mixed-layer LCL
- 1433 m above ground
- 0-6 km bulk shear
- 49 kt
- 0-1 km storm-relative helicity
- 244 m²/s²
- 0-3 km storm-relative helicity
- 408 m²/s²
- Significant tornado parameter
- 1.6
- Supercell composite
- 15.2
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 |
|---|---|---|---|---|
| Apr 27, 7:55 PM CDT | Mesoscale Discussion | SPC | Autauga, Bibb, Blount, Butler, Calhoun, Cherokee and 27 more | 65 min |
| Apr 27, 9:20 PM CDT | Mesoscale Discussion | SPC | Autauga, Bibb, Blount, Butler, Calhoun, Cherokee and 29 more | 25 min |
| Apr 27, 9:42 PM CDT | Tornado Watch | SPC | Autauga, Bibb, Butler, Calhoun, Cherokee, Chilton and 19 more | 4 hr |
| Apr 28, 1:22 AM CDT | Mesoscale Discussion | SPC | Dale, Geneva, Henry, Houston | 83 min |
| Apr 27, 11:56 PM CDT | Tornado Watch | SPC | Baldwin, Banks, Barrow, Bibb, Bleckley, Burke and 80 more | 4 hr |
| Apr 28, 2:30 AM CDT | Mesoscale Discussion | SPC | Baldwin, Bibb, Bleckley, Burke, Chattahoochee, Columbia and 30 more | 90 min |
| Apr 28, 3:30 AM CDT | Tornado Watch | SPC | Baldwin, Bibb, Bleckley, Bulloch, Burke, Candler and 37 more | 10 hr |
| Apr 28, 7:05 AM CDT | Mesoscale Discussion | SPC | Burke, Candler, Dodge, Emanuel, Jefferson, Jenkins and 5 more | 85 min |
| Apr 28, 7:48 AM CDT | Tornado Watch | SPC | Bryan, Bulloch, Candler, Chatham, Effingham, Evans and 6 more | 7 hr |
| Apr 28, 8:47 AM CDT | Severe Thunderstorm Watch | SPC | Appling, Atkinson, Bacon, Brantley, Camden, Charlton and 8 more | 9 hr |
| Apr 28, 10:22 AM CDT | Mesoscale Discussion | SPC | Bulloch, Burke, Candler, Chatham, Effingham, Emanuel and 2 more | 53 min |
| Apr 28, 11:19 AM CDT | Mesoscale Discussion | SPC | Appling, Bacon, Brantley, Camden, Charlton, Clinch and 10 more | 56 min |
| Apr 27, 9:12 PM CDT | Mesoscale Discussion | SPC | Alleghany, Ashe, Forsyth, Rockingham, Stokes, Surry and 3 more | 63 min |
| Apr 27, 11:27 PM CDT | Mesoscale Discussion | SPC | Alamance, Alleghany, Ashe, Caswell, Davidson, Davie and 11 more | 63 min |
| Apr 27, 11:41 PM CDT | Tornado Watch | SPC | Alamance, Alleghany, Ashe, Caswell, Davidson, Forsyth and 10 more | 7 hr |
| Apr 28, 6:38 AM CDT | Tornado Watch | SPC | Bertie, Camden, Caswell, Chowan, Currituck, Gates and 9 more | 7 hr |
| Apr 28, 1:41 PM CDT | Tornado Watch | SPC | Beaufort, Bertie, Camden, Carteret, Chowan, Craven and 21 more | 6 hr |
| Apr 28, 2:19 PM CDT | Tornado Watch | SPC | Bladen, Brunswick, Columbus, New Hanover, Pender | 4 hr |
| Apr 28, 5:33 PM CDT | Mesoscale Discussion | SPC | Beaufort, Bertie, Camden, Carteret, Chowan, Craven and 20 more | 57 min |
Nearby
Mesoscale Discussions in Georgia, 2011Mesoscale Discussions in North Carolina, 2011Mesoscale Discussions in Tennessee, 2011Every mesoscale discussion in 2011
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.