S1, E1: Husband and wife storm chasers, Jeff and Kathy Piotrowski, chase down a Missouri tornado; a twister in Nebraska chases meteorologist Mark Robinson; meteorologist Jaclyn Whittal witnesses one of the widest tornadoes ever.

S1, E1: Husband and wife storm chasers, Jeff and Kathy Piotrowski, chase down a Missouri tornado; a twister in Nebraska chases meteorologist Mark Robinson; meteorologist Jaclyn Whittal witnesses one of the widest tornadoes ever.