A dozen formations were recently added to the International Cloud Atlas, the official compendium of all things cloud. Cloud Appreciation Society founder Gavin Pretor-Pinney introduces us to them and to the wild and wonderful world above our heads.

Photographer Camille Seaman began chasing storms in 2008. Little did she know that she was joining a select club, with its own habits and language. Here, she shares some of the lingo you might need to get by in this world — and some of her latest images.

See the world through the eyes of a storm chaser. Here are nine beautiful photos from photographer Camille Seaman.