At any one time, it is estimated that 2,000 thunderstorms are happening across the world. The team investigates what makes the thundercloud so feared and Leo faces some giant hailstones. Leo and Mike enroll as pylon workers in Florida to find out how the men who do it avoid killer lightning strikes, and we meet the UK boy who cheated death when he was struck by lightning.

Encoded with permission for digital streaming by Infobase on May 23, 2014. Learn360 is distributed by Infobase for Films for the Humanities & Sciences, Cambridge Educational, Meridian Education, and Shopware.

Introduction: Thunderstorms: Fierce Earth (Series 1) (1:25) -- Origins of Thunder (1:22) -- Storm Chasing (1:13) -- Simulated Lightning (4:03) -- Hail (3:31) -- Top 3 Thunderstorm Sites (0:44) -- Lightning Bolt Joe (4:02) -- High Level Repair (5:11) -- Surviving in the Woods (3:46) -- Survival Guide (1:08) -- Credits: Thunderstorms: Fierce Earth (Series 1) (0:28).