CUMULUS CLOUDS These are clouds of great vertical extent from 1500 to 9000 metres. They have a low base level (500-2000 m), the base being flat and cloud masses isolated, either rounded or towering, and with a clear outline, resembling the head of a cauliflower. When these clouds are sunlit, they are brilliantly white and are called 'wool clouds'. They occur mainly in summer and are caused by convection. Small cumulus clouds are associated with fair weather.
Cumulonimbus Under different weather conditions, a cumulus cloud may develop into cumulonimbus, the thunderstorm cloud mass of enormous size which brings heavy rainfall, thunder and lightning and gusty winds. It may extend from a height of 300-600 m at the base up to 9000 to 12000 m. When seen from a distance, the top of cumulonimbus may appear white but to observers below, the sky may be darkened to almost night-time blackness.
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