When a magnitude nine earthquake leaves California in ruins, a helicopter pilot and his estranged wife make their way to San Francisco to save their only daughter.

In the span of a single day, the town of Silverton is ravaged by an unprecedented onslaught of tornadoes. The entire town is at the mercy of the erratic and deadly cyclones, even as storm trackers predict the worst is yet to come. Most people seek shelter, while others run toward the vortex, testing how far a storm chaser will go for that once-in-a-lifetime shot.