Alert archive / Georgia / Severe Thunderstorm Watches in 2017
Severe Thunderstorm Watch 285
The Storm Prediction Center issued this severe thunderstorm watch at May 27, 2017, 9:07 PM CDT for 19 counties in Alabama; 23 counties in Georgia; 6 counties in Tennessee. It was in force for 8 hr.
The area
The outline as issued.
The facts
- Issued
- May 27, 2017, 9:07 PM CDT (02:07 UTC)
- Expired
- May 28, 2017, 4:58 AM CDT
- In force
- 8 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 2 in
- Strongest gust expected
- 60 kt
All 48 counties
Blount County, AL, Cherokee County, AL, Colbert County, AL, Cullman County, AL, DeKalb County, AL, Etowah County, AL, Fayette County, AL, Franklin County, AL, Jackson County, AL, Lamar County, AL, Lauderdale County, AL, Lawrence County, AL, Limestone County, AL, Madison County, AL, Marion County, AL, Marshall County, AL, Morgan County, AL, Walker County, AL, Winston County, AL, Banks County, GA, Bartow County, GA, Catoosa County, GA, Chattooga County, GA, Cherokee County, GA, Dade County, GA, Dawson County, GA, Fannin County, GA, Floyd County, GA, Forsyth County, GA, Gilmer County, GA, Gordon County, GA, Hall County, GA, Jackson County, GA, Lumpkin County, GA, Madison County, GA, Murray County, GA, Pickens County, GA, Towns County, GA, Union County, GA, Walker County, GA, White County, GA, Whitfield County, GA, Franklin County, TN, Giles County, TN, Lawrence County, TN, Lincoln County, TN, Moore County, TN, Wayne County, TN
The radar
The Northeast Alabama radar (KHTX), 17 km from the middle of the area, began a volume at 02:06 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.
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
- 5%
- Ten or more severe wind reports
- 40%
- One or more gusts of 65 knots or more
- 10%
- Ten or more severe hail reports
- 30%
- One or more hailstones of 2 inches or more
- 30%
- Six or more combined severe hail and wind reports
- 70%
Warnings issued inside it
23 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 27, 9:14 PM CDT | Severe Thunderstorm Warning | OHX | Bedford, Giles, Marshall | 31 min |
| May 27, 9:23 PM CDT | Severe Thunderstorm Warning | HUN | Franklin, Lincoln, Moore | 37 min |
| May 27, 9:33 PM CDT | Severe Thunderstorm Warning | HUN | Franklin, Moore | 27 min |
| May 27, 9:47 PM CDT | Severe Thunderstorm Warning | FFC | Catoosa, Dade, Murray, Walker, Whitfield | 58 min |
| May 27, 9:55 PM CDT | Severe Thunderstorm Warning | HUN | Jackson, Madison | 35 min |
| May 27, 10:26 PM CDT | Severe Thunderstorm Warning | HUN | DeKalb, Jackson, Madison | 34 min |
| May 28, 12:33 AM CDT | Severe Thunderstorm Warning | HUN | Colbert, Franklin, Lauderdale | 42 min |
| May 28, 12:50 AM CDT | Severe Thunderstorm Warning | BMX | Marion | 70 min |
| May 28, 1:02 AM CDT | Severe Thunderstorm Warning | HUN | Colbert, Franklin, Lauderdale, Lawrence, Limestone | 28 min |
| May 28, 1:09 AM CDT | Severe Thunderstorm Warning | BMX | Fayette, Lamar | 81 min |
| May 28, 1:15 AM CDT | Severe Thunderstorm Warning | HUN | DeKalb, Jackson | 30 min |
| May 28, 1:21 AM CDT | Severe Thunderstorm Warning | BMX | Walker, Winston | 69 min |
| May 28, 1:30 AM CDT | Severe Thunderstorm Warning | HUN | Franklin, Lawrence, Limestone, Morgan | 30 min |
| May 28, 1:51 AM CDT | Severe Thunderstorm Warning | HUN | Cullman, Lawrence, Limestone, Marshall, Morgan | 24 min |
| May 28, 2:02 AM CDT | Severe Thunderstorm Warning | FFC | Chattooga, Floyd | 43 min |
| May 28, 2:15 AM CDT | Severe Thunderstorm Warning | HUN | Cullman, Marshall, Morgan | 30 min |
| May 28, 2:22 AM CDT | Severe Thunderstorm Warning | BMX | Blount | 53 min |
| May 28, 2:28 AM CDT | Severe Thunderstorm Warning | BMX | Jefferson, Walker | 77 min |
| May 28, 2:44 AM CDT | Severe Thunderstorm Warning | HUN | DeKalb, Marshall | 31 min |
| May 28, 2:47 AM CDT | Severe Thunderstorm Warning | BMX | Etowah, St. Clair | 58 min |
| May 28, 3:15 AM CDT | Severe Thunderstorm Warning | HUN | DeKalb | 18 min |
| May 28, 3:19 AM CDT | Severe Thunderstorm Warning | BMX | Calhoun, Cherokee | 56 min |
| May 28, 3:58 AM CDT | Severe Thunderstorm Warning | FFC | Floyd, Haralson, Polk | 37 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
Nashville Metro, TN (KBNA), launched 00:00Z, 2.1 hours before the alert went out and 141 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
- 2109 J/kg
- Mixed-layer CIN
- -21 J/kg
- Mixed-layer LCL
- 841 m above ground
- 0-6 km bulk shear
- 50 kt
- 0-1 km storm-relative helicity
- 179 m²/s²
- 0-3 km storm-relative helicity
- 175 m²/s²
- Significant tornado parameter
- 2.0
- Supercell composite
- 12.3
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 27, 11:46 PM CDT | Mesoscale Discussion | SPC | Bibb, Calhoun, Clay, Cleburne, Fayette, Jefferson and 8 more | 59 min |
| May 28, 2:11 AM CDT | Mesoscale Discussion | SPC | Bibb, Blount, Calhoun, Cherokee, Clay, Cleburne and 23 more | 2 hr |
| May 28, 2:53 AM CDT | Severe Thunderstorm Watch | SPC | Calhoun, Chambers, Chilton, Clay, Cleburne, Coosa and 6 more | 4 hr |
| May 28, 10:59 AM CDT | Mesoscale Discussion | SPC | Baldwin, Covington, Escambia, Geneva, Mobile | 2 hr |
| May 27, 10:16 PM CDT | Mesoscale Discussion | SPC | Elbert, Franklin, Habersham, Hart, Rabun, Stephens | 89 min |
| May 27, 11:13 PM CDT | Severe Thunderstorm Watch | SPC | Elbert, Franklin, Habersham, Hart, Rabun, Stephens | 3 hr |
| May 28, 5:29 AM CDT | Mesoscale Discussion | SPC | Baldwin, Bibb, Butts, Clayton, Cobb, Coweta and 21 more | 2 hr |
| May 27, 8:00 PM CDT | Mesoscale Discussion | SPC | Beaufort, Bertie, Camden, Chowan, Dare, Edgecombe and 11 more | 30 min |
| May 27, 9:46 PM CDT | Mesoscale Discussion | SPC | Alexander, Alleghany, Ashe, Avery, Buncombe, Burke and 33 more | 89 min |
| May 28, 1:17 AM CDT | Mesoscale Discussion | SPC | Cabarrus, Chatham, Davidson, Davie, Harnett, Hoke and 9 more | 58 min |
| May 28, 1:27 PM CDT | Mesoscale Discussion | SPC | Bertie, Camden, Chowan, Currituck, Gates, Hertford and 5 more | 63 min |
| May 28, 3:56 PM CDT | Mesoscale Discussion | SPC | Bladen, Brunswick, Columbus, Robeson | 2 hr |
| May 28, 6:06 PM CDT | Severe Thunderstorm Watch | SPC | Bladen, Brunswick, Columbus, New Hanover, Pender, Robeson | 4 hr |
| May 27, 7:02 PM CDT | Mesoscale Discussion | SPC | Bedford, Cannon, Cheatham, Coffee, Davidson, DeKalb and 18 more | 58 min |
| May 27, 9:26 PM CDT | Mesoscale Discussion | SPC | Fayette, Haywood, Lauderdale, Shelby, Tipton | 94 min |
| May 27, 9:59 PM CDT | Tornado Watch | SPC | Chester, Crockett, Decatur, Fayette, Hardeman, Hardin and 7 more | 2 hr |
Nearby
Severe Thunderstorm Watches in Georgia, 2017Severe Thunderstorm Watches in Alabama, 2017Severe Thunderstorm Watches in Tennessee, 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.