층운, or "stratocumulus," is a type of cloud characterized by low, lumpy layers that often cover the sky. These clouds typically appear gray or white and can bring light rain or drizzle. They form when warm, moist air rises and cools, leading to condensation. 층운 clouds are commonly found in stable weather conditions and can indicate a change in the weather. They are part of the cloud classification system, which categorizes clouds based on their appearance and altitude. Observing 층운 can help meteorologists predict upcoming weather patterns.