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clouds [3]click to hear

Fine droplets of water or ice crystal suspended in the atmosphere; the World Meteorological Organization classifies them according to 10 types.
clouds [3] middle clouds altostratus altocumulus

middle clouds click to hear

Clouds at an altitude of 6,500 to 20,000 feet and composed of water droplets and ice crystals.

altostratus click to hear

Gray sheet that can completely cover the sky but allows the Sun to be seen without a halo phenomenon; it can trigger heavy precipitation.

altocumulus click to hear

Cloud composed of large white or gray flecks that sometimes form parallel layers; it foreshadows the arrival of a depression.