clouds [1]

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

clouds of vertical development

Clouds whose base is at low altitude but extend very high; the two types are cumulus and cumulonimbus.

cumulonimbus

Very imposing cloud that can reach a thickness of 6 mi and whose base is very dark; it can trigger violent precipitation.

cumulus

Fair-weather cloud with very clear contours; it has a gray, flat base and a white top with rounded protuberances.