Mammatus Clouds ☁️ The most unusual clouds in the world ✈️ 

Meteo: Mammatus Clouds, they are the most unusual clouds in the world.
Theory formation is that mammatus clouds form when ice crystals within a cloud become vapor and cool the air around them. This colder air sinks, producing a pouch at the bottom of the cloud.
Although mammatus clouds have the reputation of being harbingers of tornadoes and severe thunderstorms, that’s not always the case. Although they are often associated with cumulonimbus clouds, which are essentially giant masses of unstable air, mammatus can occasionally form in other types of clouds like stratocumulus, altostratus and altocumulus.