Reed and Joel Patch their friendship the Dominator is damaged.

The deadliest tornado of the season hits. Reed Joel and Chris chase a tornado that changes their lives.

Reed pursues TV weather woman Ginger Zee and a long-time chaser calls it quits.

Sean gets his best tornado intercept chance ever.

The Dominator gets probe cannons, and a member of the team dies.

The supercell system tearing across South Dakota spawns a massive tornado that gives all the teams plenty of almost non-stop intercept action.

Reed's air cannons are locked and loaded, but multiple tornadoes prove a hard target for an itchy trigger finger. Tim's team chases in the tornado twilight zone, while Sean weathers a storm of controversy.

Storm and chasers collide in Minnesota for a final showdown. As a ferocious EF-4 twister targets the town of Wadena, one team finds themselves in the wrong place at the right time, and Sean's trial by fire becomes a race to save others.