I grew up in Birmingham, and having a dryline to move from west to east across North Central Alabama is not unheard of at all. I recall three severe weather episodes that occurred in the late 1990s and early 2000s where supercells essentially formed in a linear fashion along those dryline and caused several spin up tornadoes along their paths. As a matter of fact, the one in the late 1990s was one of the two tornadoes I've experienced in my life was a result of these type of events.