This episode provides a lyrical if sobering look at rain and clouds, including interviews with survivors of flash floods that struck Lynmouth, England, in 1952 and Big Thompson Canyon, Colo., in 1976.

This episode explores the staggering power of tornadoes and lightning - and travels with “storm chasers” on the hunt for a tornado.

This episode starts with the ocean, then introduces its ferocious offspring, hurricanes. Of particular interest: Hurricane Andrew, which struck several Miami suburbs with full force in 1992.

This episode poses the question, What is snow?, as well as visiting the residents of Oimyakon, the world’s coldest inhabited village, a Siberian settlement where pens won’t write (the ink freezes solid) and milk is sold in frozen blocks.