Alert archive / Georgia / Mesoscale Discussions in 2018
Mesoscale Discussion 220
The Storm Prediction Center issued this mesoscale discussion at Apr 4, 2018, 1:00 AM CDT for 5 states. It was in force for 105 min.
The area
The outline as issued.
The facts
- Issued
- Apr 4, 2018, 1:00 AM CDT (06:00 UTC)
- Expired
- Apr 4, 2018, 2:45 AM CDT
- In force
- 105 min
- Issued by
- the Storm Prediction Center
All 70 counties
Autauga County, AL, Chambers County, AL, Chilton County, AL, Clay County, AL, Cleburne County, AL, Coosa County, AL, Elmore County, AL, Randolph County, AL, Talladega County, AL, Tallapoosa County, AL, Bartow County, GA, Carroll County, GA, Cherokee County, GA, Clayton County, GA, Cobb County, GA, Coweta County, GA, Dawson County, GA, DeKalb County, GA, Douglas County, GA, Fannin County, GA, Fayette County, GA, Floyd County, GA, Forsyth County, GA, Fulton County, GA, Gilmer County, GA, Gordon County, GA, Gwinnett County, GA, Habersham County, GA, Hall County, GA, Haralson County, GA, Heard County, GA, Lumpkin County, GA, Murray County, GA, Paulding County, GA, Pickens County, GA, Polk County, GA, Rabun County, GA, Towns County, GA, Troup County, GA, Union County, GA, White County, GA, Whitfield County, GA, Buncombe County, NC, Cherokee County, NC, Clay County, NC, Graham County, NC, Haywood County, NC, Jackson County, NC, Macon County, NC, Madison County, NC, Mitchell County, NC, Swain County, NC, Yancey County, NC, 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, Monroe County, TN, Polk County, TN, Sevier County, TN, Sullivan County, TN, Unicoi County, TN, Washington County, TN, City of Bristol, VA, Scott County, VA
The radar
The Atlanta radar (KFFC), 82 km from the middle of the area, began a volume at 05:59 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 nearest sounding before it
Peachtre/Fal Fld, GA (KFFC), launched 00:00Z, 6.0 hours before the alert went out and 84 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
- 66 J/kg
- Mixed-layer CIN
- -66 J/kg
- Mixed-layer LCL
- 1853 m above ground
- 0-6 km bulk shear
- 43 kt
- 0-1 km storm-relative helicity
- 58 m²/s²
- 0-3 km storm-relative helicity
- 102 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.2
The text
As transmitted.
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</html>SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 3, 7:14 PM CDT | Severe Thunderstorm Watch | SPC | Colbert, Cullman, DeKalb, Fayette, Franklin, Jackson and 10 more | 5 hr |
| Apr 3, 9:47 PM CDT | Severe Thunderstorm Watch | SPC | Bibb, Blount, Calhoun, Cherokee, Chilton, Clay and 13 more | 4 hr |
| Apr 3, 11:09 PM CDT | Mesoscale Discussion | SPC | Autauga, Bibb, Calhoun, Cherokee, Chilton, Choctaw and 21 more | 66 min |
| Apr 3, 10:49 PM CDT | Mesoscale Discussion | SPC | Catoosa | 86 min |
| Apr 4, 12:27 PM CDT | Mesoscale Discussion | SPC | Beaufort, Bertie, Camden, Chowan, Currituck, Dare and 20 more | 3 hr |
| Apr 3, 8:16 PM CDT | Mesoscale Discussion | SPC | Anderson, Bedford, Bledsoe, Blount, Campbell, Cannon and 31 more | 89 min |
| Apr 3, 8:50 PM CDT | Severe Thunderstorm Watch | SPC | Anderson, Bledsoe, Blount, Bradley, Campbell, Claiborne and 20 more | 5 hr |
Nearby
Mesoscale Discussions in Georgia, 2018Mesoscale Discussions in Tennessee, 2018Mesoscale Discussions in North Carolina, 2018Every mesoscale discussion in 2018
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.