What is currently going on in the atmosphere is one of the best indicators of what is going to happen in the next few hours, or perhaps an indication of what has just occurred.
Undulatas asperatus clouds From the American Meteorological Society Glossary, the definition of Undulatas is: A cloud variety composed of merged or separate elements that are elongated and parallel, either suggestive of ocean waves or arranged in ranks and files. In simpler terms, they are caused by buoyancy in the atmosphere and when there is a cloud deck already in place, gravity and buoyancy create waves in the clouds. It creates an illusion of being underwater, looking up at waves breaking overhead, while in reality you are looking up at a very fluid atmosphere.
Mammatus clouds are a rare example of clouds forming in areas of sinking air and can last a long time if the area of sinking air contains large drops and snow crystals. This is because larger particles require greater amounts of energy for evaporation to occur. Evaporation inside the area of sinking air causes pockets of negative buoyancy and this is what forms the sac-like cloud formation.
severe weather is in the area.
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