Director Steven Quale is lining up the cast for his found footage tornado thriller Category Six, adding Richard Armitage (The Hobbit: An Unexpected Journey) and Sarah Wayne Callies (The Walking Dead) to the cast.

We first reported on this project back in October, when New Line Cinema acquired the screenplay by John Swetnam. This found footage drama centers on the worst tornado in American history, as captured by a group of local high school students through their cell phones and other devices. Richard Armitage is playing a widowed father, who enlists the help of storm chasers to find his missing son. No details were given for Sarah Wayne Callies' character.

Shooting is scheduled to begin July 23 in Detroit, although the production schedule raises an interesting question about Sarah Wayne Callies' involvement. The actress is still shooting The Walking Dead Season 3 in Atlanta, so either she was granted a break from shooting... or, perhaps, her character Lori doesn't make it to the end of this upcoming season.