Alert archive / Georgia / Mesoscale Discussions in 2011
Mesoscale Discussion 500
The Storm Prediction Center issued this mesoscale discussion at Apr 21, 2011, 2:05 AM EDT for 45 counties in Georgia. It was in force for 85 min.
The area
The outline as issued.
The facts
- Issued
- Apr 21, 2011, 2:05 AM EDT (06:05 UTC)
- Expired
- Apr 21, 2011, 3:30 AM EDT
- In force
- 85 min
- Issued by
- the Storm Prediction Center
All 45 counties
Baldwin County, GA, Barrow County, GA, Bartow County, GA, Bibb County, GA, Butts County, GA, Carroll County, GA, Cherokee County, GA, Clarke County, GA, Clayton County, GA, Cobb County, GA, Coweta County, GA, DeKalb County, GA, Douglas County, GA, Fayette County, GA, Floyd County, GA, Forsyth County, GA, Fulton County, GA, Glascock County, GA, Greene County, GA, Gwinnett County, GA, Hancock County, GA, Heard County, GA, Henry County, GA, Jackson County, GA, Jasper County, GA, Jones County, GA, Lamar County, GA, McDuffie County, GA, Meriwether County, GA, Monroe County, GA, Morgan County, GA, Newton County, GA, Oconee County, GA, Oglethorpe County, GA, Paulding County, GA, Pike County, GA, Putnam County, GA, Rockdale County, GA, Spalding County, GA, Taliaferro County, GA, Troup County, GA, Upson County, GA, Walton County, GA, Warren County, GA, Wilkes County, GA
The radar
The Atlanta radar (KFFC), 48 km from the middle of the area, began a volume at 06:06 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, 6.1 hours before the alert went out and 43 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
- 316 J/kg
- Mixed-layer CIN
- -171 J/kg
- Mixed-layer LCL
- 1406 m above ground
- 0-6 km bulk shear
- 17 kt
- 0-1 km storm-relative helicity
- 76 m²/s²
- 0-3 km storm-relative helicity
- 108 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 |
|---|---|---|---|---|
| Apr 21, 2:32 AM EDT | Severe Thunderstorm Watch | SPC | Baldwin, Banks, Barrow, Bartow, Butts, Carroll and 51 more | 2 hr |
| Apr 21, 4:09 AM EDT | Mesoscale Discussion | SPC | Clarke, Elbert, Franklin, Greene, Hart, Lincoln and 5 more | 96 min |
| Apr 21, 5:40 PM EDT | Mesoscale Discussion | SPC | Appling, Bacon, Brantley, Bryan, Bulloch, Burke and 22 more | 3 hr |
Nearby
Mesoscale Discussions in Georgia, 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.