Fine droplets of water or ice crystal suspended in the atmosphere; the World Meteorological Organization classifies them according to 10 types.
Clouds that do not exceed 6,500 feet in altitude and are composed of water droplets occasionally mixed with ice crystals; they sometimes generate continuous precipitation.
Gray and white cloud arranged in more or less continuous rolled layers; it does not usually trigger precipitation.
Cloud in the form of a dark layer sufficiently thick to block out the Sun; it triggers continuous precipitation.
Gray cloud forming a continuous veil that is similar to fog, though it never touches the ground; it can trigger light precipitation.