clouds [4]

Fine droplets of water or ice crystal suspended in the atmosphere; the World Meteorological Organization classifies them according to 10 types.

low clouds

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.

stratocumulus

Gray and white cloud arranged in more or less continuous rolled layers; it does not usually trigger precipitation.

nimbostratus

Cloud in the form of a dark layer sufficiently thick to block out the Sun; it triggers continuous precipitation.

stratus

Gray cloud forming a continuous veil that is similar to fog, though it never touches the ground; it can trigger light precipitation.