Clouds are formed when air contains as much water vapor it can hold, reaching what is called the saturation point. There are three classifications for clouds: Low are 50 feet to 6,500 feet; middle are 6,500 feet to 20,000 feet; and high are 20,000 feet and above. Hurricanes arise from cumulonimbus clouds which can grow to heights of 65,000 feet. Beyond this height, the atmosphere does not hold water and clouds do not form.
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