Four families in a Heartland town are tested in a single day when a tornado hits, forcing paths to cross and redefining the meaning of survival.

Bill and Jo Harding, advanced storm chasers on the brink of divorce, must join together to create an advanced weather alert system by putting themselves in the cross-hairs of extremely violent tornadoes.

After a family survives Hurricane Katrina, there is another storm but this one is much worse.