The Storm Clouds are a Grey Enemies of the game Angry Birds Color Adventure
HistoryThe Storm Clouds are storm clouds that have been captured by the Grey King, that did get stormy forever.
Grey King ordered them to collect that colored and white clouds, and turn into more Storm Clouds. In Angry Birds Epic 2, its called as "Storm" for the final battle. Its where Bubbles faces Sword Spirit.
Storm Clouds can burn Angry Birds taking a big shock.