Alert archive / Alabama / Severe Thunderstorm Watches in 2024
Severe Thunderstorm Watch 331
The Storm Prediction Center issued this severe thunderstorm watch at May 27, 2024, 4:12 AM CDT for 20 counties in Alabama. It was in force for 5 hr.
The area
The outline as issued.
The facts
- Issued
- May 27, 2024, 4:12 AM CDT (09:12 UTC)
- Expired
- May 27, 2024, 9:00 AM CDT
- In force
- 5 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 1.5 in
- Strongest gust expected
- 60 kt
Counties Bibb County, AL, Calhoun County, AL, Chambers County, AL, Chilton County, AL, Clay County, AL, Cleburne County, AL, Coosa County, AL, Greene County, AL, Hale County, AL, Jefferson County, AL, Marengo County, AL, Perry County, AL, Pickens County, AL, Randolph County, AL, Shelby County, AL, St. Clair County, AL, Sumter County, AL, Talladega County, AL, Tallapoosa County, AL, Tuscaloosa County, AL
The radar
The Birmingham radar (KBMX), 37 km from the middle of the area, began a volume at 09:10 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
- 20%
- Ten or more severe hail reports
- 40%
- One or more hailstones of 2 inches or more
- 20%
- Six or more combined severe hail and wind reports
- 70%
Warnings issued inside it
8 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 27, 5:20 AM CDT | Severe Thunderstorm Warning | BMX | Bibb, Chilton, Jefferson, Shelby, Tuscaloosa | 40 min |
| May 27, 5:39 AM CDT | Severe Thunderstorm Warning | BMX | Jefferson, St. Clair, Shelby, Talladega | 51 min |
| May 27, 5:49 AM CDT | Severe Thunderstorm Warning | BMX | Calhoun, Cleburne, Talladega | 41 min |
| May 27, 5:57 AM CDT | Severe Thunderstorm Warning | BMX | Jefferson, St. Clair | 33 min |
| May 27, 6:11 AM CDT | Severe Thunderstorm Warning | BMX | Calhoun, St. Clair | 34 min |
| May 27, 6:20 AM CDT | Severe Thunderstorm Warning | BMX | Clay | 28 min |
| May 27, 6:26 AM CDT | Severe Thunderstorm Warning | BMX | Calhoun, Cleburne, Talladega | 49 min |
| May 27, 6:29 AM CDT | Flash Flood Warning | BMX | Calhoun, St. Clair | 3 hr |
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 00:00Z, 9.2 hours before the alert went out and 35 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
- 1594 J/kg
- Mixed-layer CIN
- -39 J/kg
- Mixed-layer LCL
- 1387 m above ground
- 0-6 km bulk shear
- 51 kt
- 0-1 km storm-relative helicity
- 88 m²/s²
- 0-3 km storm-relative helicity
- 192 m²/s²
- Significant tornado parameter
- 0.7
- Supercell composite
- 5.1
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 27, 12:52 AM CDT | Mesoscale Discussion | SPC | Blount, Colbert, Cullman, DeKalb, Etowah, Fayette and 12 more | 113 min |
| May 27, 1:10 AM CDT | Tornado Watch | SPC | Blount, Cherokee, Colbert, Cullman, DeKalb, Etowah and 13 more | 5 hr |
| May 27, 2:47 AM CDT | Mesoscale Discussion | SPC | Blount, Cherokee, Colbert, Cullman, DeKalb, Etowah and 18 more | 118 min |
| May 27, 12:41 PM CDT | Mesoscale Discussion | SPC | Barbour, Bullock, Butler, Coffee, Conecuh, Covington and 13 more | 94 min |
| May 27, 1:10 PM CDT | Severe Thunderstorm Watch | SPC | Barbour, Bullock, Coffee, Dale, Geneva, Henry and 5 more | 8 hr |
| May 27, 3:11 PM CDT | Mesoscale Discussion | SPC | Barbour, Bullock, Coffee, Dale, Geneva, Henry and 5 more | 94 min |
| May 27, 4:42 PM CDT | Mesoscale Discussion | SPC | Autauga, Bullock, Butler, Clarke, Coffee, Conecuh and 12 more | 2 hr |
| May 27, 5:10 PM CDT | Severe Thunderstorm Watch | SPC | Baldwin, Butler, Clarke, Conecuh, Covington, Crenshaw and 5 more | 5 hr |
Nearby
Severe Thunderstorm Watches in Alabama, 2024Every severe thunderstorm watch in 2024
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.