Alert archive / Georgia / Severe Thunderstorm Watches in 2017
Severe Thunderstorm Watch 60
The Storm Prediction Center issued this severe thunderstorm watch at Mar 1, 2017, 3:43 PM CST for 16 counties in Alabama; 28 counties in Georgia. It was in force for 4 hr.
The area
The outline as issued.
The facts
- Issued
- Mar 1, 2017, 3:43 PM CST (21:43 UTC)
- Expired
- Mar 1, 2017, 8:10 PM CST
- In force
- 4 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 2 in
- Strongest gust expected
- 60 kt
All 44 counties
Autauga County, AL, Bibb County, AL, Chambers County, AL, Chilton County, AL, Clay County, AL, Cleburne County, AL, Coosa County, AL, Dallas County, AL, Elmore County, AL, Hale County, AL, Marengo County, AL, Perry County, AL, Randolph County, AL, Shelby County, AL, Talladega County, AL, Tallapoosa County, AL, Banks County, GA, Barrow County, GA, Carroll County, GA, Clarke County, GA, Clayton County, GA, Cobb County, GA, Coweta County, GA, DeKalb County, GA, Douglas County, GA, Fayette County, GA, Forsyth County, GA, Fulton County, GA, Gwinnett County, GA, Hall County, GA, Haralson County, GA, Heard County, GA, Henry County, GA, Jackson County, GA, Madison County, GA, Meriwether County, GA, Newton County, GA, Oconee County, GA, Paulding County, GA, Pike County, GA, Rockdale County, GA, Spalding County, GA, Troup County, GA, Walton County, GA
The radar
The Atlanta radar (KFFC), 57 km from the middle of the area, began a volume at 21:43 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.
What SPC expected
The probabilities SPC published with the watch, for the watch area over its life.
- Two or more tornadoes
- 20%
- One or more EF2 to EF5 tornadoes
- 2%
- Ten or more severe wind reports
- 40%
- One or more gusts of 65 knots or more
- 10%
- Ten or more severe hail reports
- 50%
- One or more hailstones of 2 inches or more
- 30%
- Six or more combined severe hail and wind reports
- 70%
Warnings issued inside it
10 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Mar 1, 3:44 PM CST | Severe Thunderstorm Warning | BMX | Bibb | 46 min |
| Mar 1, 4:12 PM CST | Severe Thunderstorm Warning | BMX | Hale | 48 min |
| Mar 1, 4:21 PM CST | Severe Thunderstorm Warning | BMX | Chilton | 42 min |
| Mar 1, 4:42 PM CST | Severe Thunderstorm Warning | BMX | Perry | 37 min |
| Mar 1, 4:47 PM CST | Severe Thunderstorm Warning | FFC | Dawson, Hall, Lumpkin, White | 43 min |
| Mar 1, 4:49 PM CST | Severe Thunderstorm Warning | BMX | Coosa | 56 min |
| Mar 1, 5:02 PM CST | Severe Thunderstorm Warning | BMX | Cleburne | 28 min |
| Mar 1, 5:20 PM CST | Severe Thunderstorm Warning | FFC | Carroll, Douglas, Haralson, Paulding | 40 min |
| Mar 1, 5:51 PM CST | Severe Thunderstorm Warning | BMX | Tallapoosa | 24 min |
| Mar 1, 5:57 PM CST | Severe Thunderstorm Warning | FFC | Carroll, Coweta, Douglas, Fulton | 48 min |
Discussions around it
SPC mesoscale discussions over the same counties from four hours before the watch to its end.
The nearest sounding before it
Peachtre/Fal Fld, GA (KFFC), launched 12:00Z, 9.7 hours before the alert went out and 62 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
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 680 m above ground
- 0-6 km bulk shear
- 53 kt
- 0-1 km storm-relative helicity
- 173 m²/s²
- 0-3 km storm-relative helicity
- 306 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
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 |
|---|---|---|---|---|
| Mar 1, 4:19 AM CST | Mesoscale Discussion | SPC | Lauderdale | 56 min |
| Mar 1, 5:28 AM CST | Mesoscale Discussion | SPC | Lauderdale | 2 hr |
| Mar 1, 10:08 AM CST | Mesoscale Discussion | SPC | Blount, Calhoun, Cherokee, Colbert, Cullman, DeKalb and 19 more | 2 hr |
| Mar 1, 11:48 AM CST | Tornado Watch | SPC | Blount, Calhoun, Cherokee, Colbert, Cullman, DeKalb and 20 more | 6 hr |
| Mar 1, 2:11 PM CST | Mesoscale Discussion | SPC | Blount, Calhoun, Cherokee, Cullman, DeKalb, Etowah and 7 more | 2 hr |
| Mar 1, 2:43 PM CST | Mesoscale Discussion | SPC | Autauga, Chambers, Chilton, Clay, Coosa, Elmore and 3 more | 3 hr |
| Mar 1, 5:54 PM CST | Mesoscale Discussion | SPC | Autauga, Bibb, Chambers, Chilton, Choctaw, Clarke and 16 more | 2 hr |
| Mar 1, 1:07 PM CST | Mesoscale Discussion | SPC | Rabun | 113 min |
| Mar 1, 2:02 PM CST | Severe Thunderstorm Watch | SPC | Elbert, Franklin, Habersham, Hart, Rabun, Stephens | 7 hr |
Nearby
Severe Thunderstorm Watches in Georgia, 2017Severe Thunderstorm Watches in Alabama, 2017Every severe thunderstorm watch in 2017
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.