Alert archive / Georgia / Mesoscale Discussions in 2011
Mesoscale Discussion 1277
The Storm Prediction Center issued this mesoscale discussion at Jun 18, 2011, 3:55 PM EDT for 31 counties in Georgia; 12 counties in South Carolina. It was in force for 35 min.
The area
The outline as issued.
The facts
- Issued
- Jun 18, 2011, 3:55 PM EDT (19:55 UTC)
- Expired
- Jun 18, 2011, 4:30 PM EDT
- In force
- 35 min
- Issued by
- the Storm Prediction Center
All 43 counties
Barrow County, GA, Carroll County, GA, Clarke County, GA, Clayton County, GA, Cobb County, GA, Columbia County, GA, DeKalb County, GA, Douglas County, GA, Elbert County, GA, Fayette County, GA, Fulton County, GA, Greene County, GA, Gwinnett County, GA, Haralson County, GA, Henry County, GA, Jasper County, GA, Lincoln County, GA, Madison County, GA, McDuffie County, GA, Morgan County, GA, Newton County, GA, Oconee County, GA, Oglethorpe County, GA, Paulding County, GA, Putnam County, GA, Richmond County, GA, Rockdale County, GA, Taliaferro County, GA, Walton County, GA, Warren County, GA, Wilkes County, GA, Abbeville County, SC, Aiken County, SC, Calhoun County, SC, Edgefield County, SC, Fairfield County, SC, Greenwood County, SC, Lexington County, SC, McCormick County, SC, Newberry County, SC, Orangeburg County, SC, Richland County, SC, Saluda County, SC
The radar
The Atlanta radar (KFFC), 78 km from the middle of the area, began a volume at 19:59 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, 7.9 hours before the alert went out and 73 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
- 1149 J/kg
- Mixed-layer CIN
- -132 J/kg
- Mixed-layer LCL
- 704 m above ground
- 0-6 km bulk shear
- 8 kt
- 0-1 km storm-relative helicity
- 23 m²/s²
- 0-3 km storm-relative helicity
- 33 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 |
|---|---|---|---|---|
| Jun 18, 9:38 AM EDT | Mesoscale Discussion | SPC | Banks, Bartow, Catoosa, Chattooga, Cherokee, Cobb and 22 more | 97 min |
| Jun 18, 11:05 AM EDT | Severe Thunderstorm Watch | SPC | Banks, Bartow, Catoosa, Chattooga, Cherokee, Dade and 20 more | 9 hr |
| Jun 18, 2:21 PM EDT | Mesoscale Discussion | SPC | Banks, Bartow, Catoosa, Chattooga, Cherokee, Dawson and 20 more | 84 min |
| Jun 18, 4:08 PM EDT | Severe Thunderstorm Watch | SPC | Baldwin, Barrow, Burke, Butts, Carroll, Clarke and 51 more | 6 hr |
| Jun 18, 6:49 PM EDT | Mesoscale Discussion | SPC | Baldwin, Barrow, Bibb, Bleckley, Bulloch, Burke and 55 more | 86 min |
| Jun 18, 7:20 PM EDT | Severe Thunderstorm Watch | SPC | Bryan, Bulloch, Candler, Chatham, Effingham, Evans and 6 more | 5 hr |
| Jun 18, 5:46 PM EDT | Mesoscale Discussion | SPC | Chesterfield, Darlington, Dillon, Fairfield, Greenwood, Kershaw and 8 more | 59 min |
Nearby
Mesoscale Discussions in Georgia, 2011Mesoscale Discussions in South Carolina, 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.