Hear the rumble of ice blocks shearing off the edge of a glacier. See the destructive power of a tornado’s swirling winds. Watch flames devour a forest as if it were so many matchsticks.

These dramatic scenes are presented in the new IMAX documentary film Extreme Weather, produced by National Geographic and appearing in theaters starting October 15.

More than two years in the making, the film takes viewers from Alaska to California to witness the awesome power of the Earth. It offers a front-row seat on a fast-changing and dangerous world.

We spoke with the film’s director, Sean Casey, a veteran storm chaser and filmmaker who's also known for his IMAX works Tornado Alley (2011), Forces of Nature (2004), and Alaska: