Alert archive / Georgia / Mesoscale Discussions in 2011
Mesoscale Discussion 776
The Storm Prediction Center issued this mesoscale discussion at May 13, 2011, 3:47 PM EDT for 6 states. It was in force for 58 min.
The area
The outline as issued.
The facts
- Issued
- May 13, 2011, 3:47 PM EDT (19:47 UTC)
- Expired
- May 13, 2011, 4:45 PM EDT
- In force
- 58 min
- Issued by
- the Storm Prediction Center
All 79 counties
Banks County, GA, Barrow County, GA, Bartow County, GA, Cherokee County, GA, Cobb County, GA, Dawson County, GA, DeKalb County, GA, Fannin 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, Jackson County, GA, Lumpkin County, GA, Paulding County, GA, Pickens County, GA, Polk County, GA, Rabun County, GA, Stephens County, GA, Towns County, GA, Union County, GA, Walton County, GA, White County, GA, Harlan County, KY, Letcher County, KY, Ashe County, NC, Avery County, NC, Buncombe County, NC, Cherokee County, NC, Clay County, NC, Graham County, NC, Haywood County, NC, Henderson County, NC, Jackson County, NC, Macon County, NC, Madison County, NC, McDowell County, NC, Mitchell County, NC, Swain County, NC, Transylvania County, NC, Watauga County, NC, Yancey County, NC, Oconee County, SC, Pickens 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, Monroe County, TN, Sevier County, TN, Sullivan County, TN, Unicoi County, TN, Washington County, TN, Bland County, VA, Buchanan County, VA, City of Bristol, VA, City of Norton, VA, Dickenson County, VA, Grayson County, VA, Lee County, VA, Pulaski County, VA, Russell County, VA, Scott County, VA, Smyth County, VA, Tazewell County, VA, Washington County, VA, Wise County, VA, Wythe County, VA
The radar
The Greer radar (KGSP), 101 km from the middle of the area, began a volume at 19:49 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, 7.8 hours before the alert went out and 227 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
- 696 J/kg
- Mixed-layer CIN
- -88 J/kg
- Mixed-layer LCL
- 1122 m above ground
- 0-6 km bulk shear
- 25 kt
- 0-1 km storm-relative helicity
- -33 m²/s²
- 0-3 km storm-relative helicity
- 32 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 |
|---|---|---|---|---|
| May 13, 12:22 PM EDT | Mesoscale Discussion | SPC | Catoosa, Chattooga, Fannin, Floyd, Gilmer, Gordon and 4 more | 113 min |
| May 13, 1:10 PM EDT | Severe Thunderstorm Watch | SPC | Bartow, Catoosa, Chattooga, Cherokee, Dade, Dawson and 18 more | 6 hr |
| May 13, 4:44 PM EDT | Severe Thunderstorm Watch | SPC | Elbert, Franklin, Hart, Stephens | 8 hr |
| May 13, 1:01 PM EDT | Mesoscale Discussion | SPC | Carlisle, Fulton, Graves, Hickman | 89 min |
| May 13, 1:31 PM EDT | Severe Thunderstorm Watch | SPC | Ballard, Calloway, Carlisle, Fulton, Graves, Hickman and 3 more | 6 hr |
| May 13, 3:44 PM EDT | Mesoscale Discussion | SPC | Ballard, Carlisle, Fulton, Graves, Hickman | 2 hr |
| May 13, 6:03 PM EDT | Mesoscale Discussion | SPC | Christian, Hopkins, Logan, Muhlenberg, Todd, Trigg | 57 min |
| May 13, 6:54 PM EDT | Severe Thunderstorm Watch | SPC | Allen, Butler, Caldwell, Calloway, Christian, Crittenden and 17 more | 6 hr |
| May 13, 4:36 PM EDT | Mesoscale Discussion | SPC | Alamance, Alexander, Alleghany, Anson, Ashe, Avery and 28 more | 24 min |
| May 13, 7:21 PM EDT | Severe Thunderstorm Watch | SPC | Bladen, Cumberland, Duplin, Edgecombe, Franklin, Greene and 11 more | 6 hr |
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.