A freak cyclone hits Los Angeles, causing water spouts that scoop up man-eating sharks and flood the city with shark-infested seawater. Bar owner and surfer Fin sets out with his friends, Baz, Nova, and George, to rescue his estranged wife, April, and their teenage daughter, Claudia, after the bar and boardwalk are destroyed by the flooding. While heading to April's home, the group stops on a freeway to save people as flooding causes sharks to attack. George is killed and the group learns of a tornado warning. They arrive at April's house just before the first floor is flooded and shark-infested. Collin, April's boyfriend, is eaten by sharks, but the rest of the group escapes unharmed from the house, which gets hit by a huge wave causing it to collapse.