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.

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.