Mammatus Cloud
Mammatus cloud is scary and mysterious. Nobody knows how they form. Meteorologist William Clement Ley first described the formation of mammatus cloud in 1894. They have a strange appearance of cell pouches hanging from the base of another cloud. These beautiful clouds form under different environment and sky conditions. There are several theories on how they form and nobody has ever been able to explain this mysterious sky phenomenon. One of the theories explains about cold air sinking down to form pockets of clouds through convection of warm air. Since, they are a form of cumulonimbus rainclouds, mammatus clouds can be dangerous and is an indication of strong storm. Aviators are always cautioned to fly when mammatus clouds appear in the sky.
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