(LAST IN THE SERIES) CUMULONIMBUS--The cloud associated with thunderstorms.The base of this type of cloud is usually in the rage 1,500 to 6,000ft, but its brilliant white tops made of ice crystals, can be over 30,000 ft high.They are cauliflower-like large towers often with anvil-shaped tops.The base of the cloud is usually very dark & threatening.Squally winds are common beneath these clouds, which are usually given a wide berth by aircraft.Thunder & lightning are commonly associated features