Nailbiter

A mother and her three daughters are forced to take shelter from an advancing tornado in a local storm cellar, only to discover that their refuge is home to another terrifying story. The family soon finds themselves under attack by a monstrous presence, one that is linked to a dark secret about the Shurman family's past and the strange phenomenon of people transforming into monsters during severe weather. As they fight for survival, the family's chances of escape are dwindling, leaving only one daughter to face an onslaught of terrifying new threats.