Alert archive / Alabama / Severe Thunderstorm Watches in 2022
Severe Thunderstorm Watch 101
The Storm Prediction Center issued this severe thunderstorm watch at Apr 6, 2022, 1:11 PM CDT for 36 counties in Alabama. It was in force for 10 hr.
The area
The outline as issued.
The facts
- Issued
- Apr 6, 2022, 1:11 PM CDT (18:11 UTC)
- Expired
- Apr 6, 2022, 11:00 PM CDT
- In force
- 10 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 2 in
- Strongest gust expected
- 60 kt
All 36 counties
Autauga County, AL, Barbour County, AL, Bibb County, AL, Blount County, AL, Bullock County, AL, Calhoun County, AL, Chambers County, AL, Cherokee County, AL, Chilton County, AL, Clay County, AL, Cleburne County, AL, Coosa County, AL, Dallas County, AL, Elmore County, AL, Etowah County, AL, Fayette County, AL, Greene County, AL, Hale County, AL, Jefferson County, AL, Lee County, AL, Lowndes County, AL, Macon County, AL, Marengo County, AL, Montgomery County, AL, Perry County, AL, Pickens County, AL, Pike County, AL, Randolph County, AL, Russell County, AL, Shelby County, AL, St. Clair County, AL, Sumter County, AL, Talladega County, AL, Tallapoosa County, AL, Tuscaloosa County, AL, Walker County, AL
The radar
The Birmingham radar (KBMX), 15 km from the middle of the area, began a volume at 18:12 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
- 5%
- Ten or more severe wind reports
- 40%
- One or more gusts of 65 knots or more
- 10%
- Ten or more severe hail reports
- 40%
- One or more hailstones of 2 inches or more
- 30%
- 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 |
|---|---|---|---|---|
| Apr 6, 1:45 PM CDT | Severe Thunderstorm Warning | BMX | Pickens, Tuscaloosa | 45 min |
| Apr 6, 2:44 PM CDT | Severe Thunderstorm Warning | BMX | Dallas | 31 min |
| Apr 6, 2:56 PM CDT | Severe Thunderstorm Warning | BMX | Elmore, Lee, Tallapoosa | 35 min |
| Apr 6, 3:00 PM CDT | Severe Thunderstorm Warning | BMX | Jefferson | 33 min |
| Apr 6, 5:39 PM CDT | Severe Thunderstorm Warning | BMX | Greene, Sumter | 24 min |
| Apr 6, 5:43 PM CDT | Severe Thunderstorm Warning | BMX | Blount, Etowah, St. Clair | 26 min |
| Apr 6, 7:45 PM CDT | Severe Thunderstorm Warning | BMX | Perry | 20 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
Birmingham, AL (KBMX), launched 12:00Z, 6.2 hours before the alert went out and 14 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
- 1131 J/kg
- Mixed-layer CIN
- -13 J/kg
- Mixed-layer LCL
- 517 m above ground
- 0-6 km bulk shear
- 27 kt
- 0-1 km storm-relative helicity
- 160 m²/s²
- 0-3 km storm-relative helicity
- 256 m²/s²
- Significant tornado parameter
- 0.6
- Supercell composite
- 3.0
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 6, 11:28 AM CDT | Mesoscale Discussion | SPC | Autauga, Barbour, Bibb, Bullock, Butler, Chambers and 21 more | 3 hr |
| Apr 6, 11:58 AM CDT | Mesoscale Discussion | SPC | Houston | 2 hr |
| Apr 6, 12:59 PM CDT | Mesoscale Discussion | SPC | Cullman, Fayette, Franklin, Jackson, Lamar, Lawrence and 5 more | 2 hr |
| Apr 6, 2:58 PM CDT | Mesoscale Discussion | SPC | Autauga, Bibb, Bullock, Chambers, Chilton, Clay and 24 more | 2 hr |
| Apr 6, 3:43 PM CDT | Mesoscale Discussion | SPC | DeKalb, Jackson, Limestone, Madison, Marshall, Morgan | 62 min |
| Apr 6, 3:59 PM CDT | Tornado Watch | SPC | DeKalb, Jackson, Marshall | 5 hr |
| Apr 6, 5:06 PM CDT | Mesoscale Discussion | SPC | Autauga, Bibb, Blount, Bullock, Butler, Calhoun and 32 more | 114 min |
Nearby
Severe Thunderstorm Watches in Alabama, 2022Every severe thunderstorm watch in 2022
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.