Alert archive / Georgia / Mesoscale Discussions in 2009
Mesoscale Discussion 1213
The Storm Prediction Center issued this mesoscale discussion at Jun 18, 2009, 4:54 PM EDT for 4 states. It was in force for 66 min.
The area
The outline as issued.
The facts
- Issued
- Jun 18, 2009, 4:54 PM EDT (20:54 UTC)
- Expired
- Jun 18, 2009, 6:00 PM EDT
- In force
- 66 min
- Issued by
- the Storm Prediction Center
All 65 counties
Banks County, GA, Barrow County, GA, Bartow County, GA, Carroll County, GA, Catoosa County, GA, Chattooga County, GA, Cherokee County, GA, Clarke County, GA, Clayton County, GA, Cobb County, GA, Columbia County, GA, Dade County, GA, Dawson County, GA, DeKalb County, GA, Douglas County, GA, Elbert County, GA, Fannin 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, Hart County, GA, Henry County, GA, Jackson County, GA, Lincoln County, GA, Lumpkin County, GA, Madison County, GA, McDuffie County, GA, Morgan County, GA, Murray County, GA, Newton County, GA, Oconee County, GA, Oglethorpe County, GA, Paulding County, GA, Pickens County, GA, Polk County, GA, Rabun County, GA, Rockdale County, GA, Stephens County, GA, Taliaferro County, GA, Towns County, GA, Union County, GA, Walker County, GA, Walton County, GA, White County, GA, Whitfield County, GA, Wilkes County, GA, Cherokee County, NC, Clay County, NC, Jackson County, NC, Macon County, NC, Abbeville County, SC, Anderson County, SC, McCormick County, SC, Oconee County, SC, Bradley County, TN, Hamilton County, TN, Marion County, TN, Polk County, TN
The radar
The Atlanta radar (KFFC), 150 km from the middle of the area, began a volume at 20:55 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, 8.9 hours before the alert went out and 148 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
- 2883 J/kg
- Mixed-layer CIN
- -24 J/kg
- Mixed-layer LCL
- 758 m above ground
- 0-6 km bulk shear
- 30 kt
- 0-1 km storm-relative helicity
- 64 m²/s²
- 0-3 km storm-relative helicity
- 158 m²/s²
- Significant tornado parameter
- 0.9
- Supercell composite
- 5.7
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 |
|---|---|---|---|---|
| Jun 17, 8:11 PM EDT | Mesoscale Discussion | SPC | Charlton | 64 min |
| Jun 17, 10:32 PM EDT | Mesoscale Discussion | SPC | Baldwin, Banks, Barrow, Burke, Butts, Cherokee and 43 more | 28 min |
| Jun 17, 10:52 PM EDT | Severe Thunderstorm Watch | SPC | Banks, Barrow, Burke, Clarke, Columbia, Dawson and 30 more | 4 hr |
| Jun 18, 1:21 AM EDT | Mesoscale Discussion | SPC | Appling, Bacon, Baldwin, Brantley, Bryan, Bulloch and 32 more | 24 min |
| Jun 18, 1:39 AM EDT | Severe Thunderstorm Watch | SPC | Appling, Bacon, Baldwin, Bartow, Bibb, Bleckley and 67 more | 5 hr |
| Jun 18, 3:45 AM EDT | Mesoscale Discussion | SPC | Appling, Bacon, Ben Hill, Bleckley, Brantley, Bryan and 31 more | 2 hr |
| Jun 18, 10:15 AM EDT | Mesoscale Discussion | SPC | Banks, Barrow, Bartow, Catoosa, Chattooga, Cherokee and 20 more | 90 min |
| Jun 18, 10:39 AM EDT | Severe Thunderstorm Watch | SPC | Banks, Barrow, Bartow, Carroll, Catoosa, Chattooga and 40 more | 7 hr |
| Jun 18, 1:48 PM EDT | Mesoscale Discussion | SPC | Banks, Barrow, Bartow, Carroll, Catoosa, Chattooga and 46 more | 57 min |
| Jun 18, 3:13 PM EDT | Severe Thunderstorm Watch | SPC | Burke, Columbia, Lincoln, McDuffie, Richmond | 6 hr |
| Jun 18, 6:02 PM EDT | Mesoscale Discussion | SPC | Appling, Atkinson, Bacon, Baldwin, Ben Hill, Berrien and 63 more | 28 min |
| Jun 18, 6:22 PM EDT | Severe Thunderstorm Watch | SPC | Appling, Atkinson, Bacon, Baldwin, Ben Hill, Berrien and 66 more | 6 hr |
| Jun 18, 6:34 PM EDT | Mesoscale Discussion | SPC | Brooks, Clinch, Colquitt, Cook, Echols, Grady and 4 more | 86 min |
| Jun 18, 2:21 PM EDT | Severe Thunderstorm Watch | SPC | Camden, Chowan, Currituck, Gates, Pasquotank, Perquimans | 9 hr |
| Jun 18, 3:31 PM EDT | Mesoscale Discussion | SPC | Warren | 59 min |
| Jun 18, 4:25 PM EDT | Mesoscale Discussion | SPC | Alexander, Alleghany, Ashe, Avery, Buncombe, Burke and 17 more | 65 min |
| Jun 17, 8:37 PM EDT | Mesoscale Discussion | SPC | Cheatham, Davidson, Montgomery, Robertson, Rutherford, Sumner and 1 more | 53 min |
Nearby
Mesoscale Discussions in Georgia, 2009Mesoscale Discussions in North Carolina, 2009Mesoscale Discussions in South 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.