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clouds ![click to hear : clouds click to hear : clouds](../../../images/speaker-vert.gif)
Fine droplets of water or ice crystal suspended in the atmosphere; the World Meteorological Organization classifies them according to 10 types.
altostratus ![click to hear : altostratus click to hear : altostratus](../../../images/speaker-vert.gif)
Gray sheet that can completely cover the sky but allows the Sun to be seen without a halo phenomenon; it can trigger heavy precipitation.
nimbostratus ![click to hear : nimbostratus click to hear : nimbostratus](../../../images/speaker-vert.gif)
Cloud in the form of a dark layer sufficiently thick to block out the Sun; it triggers continuous precipitation.
altocumulus ![click to hear : altocumulus click to hear : altocumulus](../../../images/speaker-vert.gif)
Cloud composed of large white or gray flecks that sometimes form parallel layers; it foreshadows the arrival of a depression.
cirrocumulus ![click to hear : cirrocumulus click to hear : cirrocumulus](../../../images/speaker-vert.gif)
Cloud formed of white or gray flecks or strips, often arranged in rows.
cirrostratus ![click to hear : cirrostratus click to hear : cirrostratus](../../../images/speaker-vert.gif)
Whitish layer that can completely cover the sky and that creates a halo around the Sun.
cirrus ![click to hear : cirrus click to hear : cirrus](../../../images/speaker-vert.gif)
Cloud in the form of wisps or separate strips; it usually appears in advance of a depression.
stratus ![click to hear : stratus click to hear : stratus](../../../images/speaker-vert.gif)
Gray cloud forming a continuous veil that is similar to fog, though it never touches the ground; it can trigger light precipitation.
cumulonimbus ![click to hear : cumulonimbus click to hear : cumulonimbus](../../../images/speaker-vert.gif)
Very imposing cloud that can reach a thickness of 10 km and whose base is very dark; it can trigger violent precipitation.
cumulus ![click to hear : cumulus click to hear : cumulus](../../../images/speaker-vert.gif)
Fair-weather cloud with very clear contours; it has a gray, flat base and a white top with rounded protuberances.
stratocumulus ![click to hear : stratocumulus click to hear : stratocumulus](../../../images/speaker-vert.gif)
Gray and white cloud arranged in more or less continuous rolled layers; it does not usually trigger precipitation.