Alert archive / Georgia / Severe Thunderstorm Watches in 2018
Severe Thunderstorm Watch 302
The Storm Prediction Center issued this severe thunderstorm watch at Jul 21, 2018, 6:50 PM CDT for Henry County, Houston County, Alabama; 5 counties in Florida; 15 counties in Georgia. It was in force for 5 hr.
The area
The outline as issued.
The facts
- Issued
- Jul 21, 2018, 6:50 PM CDT (23:50 UTC)
- Expired
- Jul 22, 2018, 12:00 AM CDT
- In force
- 5 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 2 in
- Strongest gust expected
- 60 kt
All 22 counties
Henry County, AL, Houston County, AL, Gadsden County, FL, Jackson County, FL, Jefferson County, FL, Leon County, FL, Wakulla County, FL, Baker County, GA, Calhoun County, GA, Clay County, GA, Decatur County, GA, Dougherty County, GA, Early County, GA, Grady County, GA, Lee County, GA, Miller County, GA, Mitchell County, GA, Quitman County, GA, Randolph County, GA, Seminole County, GA, Terrell County, GA, Thomas County, GA
The radar
The Ft Rucker radar (KEOX), 54 km from the middle of the area, began a volume at 23:52 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
- 10%
- One or more EF2 to EF5 tornadoes
- 2%
- Ten or more severe wind reports
- 20%
- One or more gusts of 65 knots or more
- 20%
- Ten or more severe hail reports
- 50%
- One or more hailstones of 2 inches or more
- 40%
- Six or more combined severe hail and wind reports
- 70%
Warnings issued inside it
7 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 21, 7:42 PM CDT | Severe Thunderstorm Warning | TAE | Clay, Quitman, Randolph | 33 min |
| Jul 21, 8:07 PM CDT | Severe Thunderstorm Warning | TAE | Calhoun, Clay, Quitman, Randolph | 53 min |
| Jul 21, 8:09 PM CDT | Severe Thunderstorm Warning | TAE | Calhoun, Dougherty, Lee, Randolph, Terrell | 51 min |
| Jul 21, 8:39 PM CDT | Severe Thunderstorm Warning | TAE | Baker, Calhoun, Dougherty, Early, Miller, Mitchell | 51 min |
| Jul 21, 9:12 PM CDT | Severe Thunderstorm Warning | TAE | Baker, Decatur, Early, Grady, Miller, Mitchell and 1 more | 48 min |
| Jul 21, 9:49 PM CDT | Severe Thunderstorm Warning | TAE | Gadsden, Jefferson, Leon | 71 min |
| Jul 21, 10:31 PM CDT | Severe Thunderstorm Warning | TAE | Gadsden, Leon | 38 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
Tallahassee Rgnl, FL (KTLH), launched 12:00Z, 11.8 hours before the alert went out and 118 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
- 1280 J/kg
- Mixed-layer CIN
- -42 J/kg
- Mixed-layer LCL
- 852 m above ground
- 0-6 km bulk shear
- 20 kt
- 0-1 km storm-relative helicity
- 34 m²/s²
- 0-3 km storm-relative helicity
- 94 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 20, 10:20 PM CDT | Mesoscale Discussion | SPC | Colbert, Franklin, Lauderdale, Lawrence, Limestone, Madison and 1 more | 115 min |
| Jul 21, 1:38 AM CDT | Mesoscale Discussion | SPC | Blount, Colbert, Cullman, DeKalb, Etowah, Franklin and 10 more | 67 min |
| Jul 21, 2:00 AM CDT | Severe Thunderstorm Watch | SPC | Blount, Calhoun, Chambers, Cherokee, Clay, Cleburne and 10 more | 7 hr |
| Jul 21, 4:35 AM CDT | Mesoscale Discussion | SPC | Calhoun, Chambers, Cherokee, Clay, Cleburne, DeKalb and 6 more | 115 min |
| Jul 21, 7:10 AM CDT | Mesoscale Discussion | SPC | Calhoun, Chambers, Cherokee, Clay, Cleburne, Etowah and 8 more | 2 hr |
| Jul 21, 10:12 AM CDT | Severe Thunderstorm Watch | SPC | Henry, Houston | 5 hr |
| Jul 21, 2:37 PM CDT | Mesoscale Discussion | SPC | Cherokee, Cleburne, DeKalb, Randolph | 2 hr |
| Jul 21, 4:42 PM CDT | Severe Thunderstorm Watch | SPC | Barbour, Bullock, Calhoun, Chambers, Cherokee, Clay and 9 more | 8 hr |
| Jul 21, 6:24 PM CDT | Mesoscale Discussion | SPC | Bullock, Calhoun, Chambers, Cherokee, Clay, Cleburne and 6 more | 96 min |
| Jul 21, 9:30 AM CDT | Mesoscale Discussion | SPC | Gadsden, Hamilton, Jefferson, Leon, Madison | 90 min |
| Jul 21, 12:37 PM CDT | Mesoscale Discussion | SPC | Alachua, Baker, Bradford, Clay, Columbia, Duval and 5 more | 83 min |
| Jul 20, 7:02 PM CDT | Tornado Watch | SPC | Catoosa, Dade, Murray, Walker, Whitfield | 7 hr |
Nearby
Severe Thunderstorm Watches in Georgia, 2018Severe Thunderstorm Watches in Florida, 2018Severe Thunderstorm Watches in Alabama, 2018Every severe thunderstorm watch 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.