Today there are four main groups of clouds, based on their level, and each with sub-classifications that describe the transitions from one cloud type to another.  Together, they form ten basic cloud classifications.

Clouds are classified into these four main groups according to the height of their bases (bottom of the cloud) and vertical development (top of the cloud). 

The cloud heights referred to in the chart below vary according to various factors such as latitude, but are commonly considered accurate.

1. High clouds generally have bases above 10,000 feet.  They tend to be thin and often start with the prefix cirro . These clouds tend to be made up of ice crystals because they are so high.

2. Middle clouds generally have bases between 6,500 and 20,000 feet. These clouds start with the prefix strato  and may be made of water or a mixture of ice and water.  There is an overlap between mid-level and high-level clouds.  Under certain conditions, mid-level clouds may form as high as 20,000 feet and high-level clouds may form as low as 10,000 feet.

3. Low clouds have bases below 6,500 feet.    These clouds are usually made entirely of water.

4. Clouds with vertical development have bases below 6,500  feet but are taller than wide, with the tops reaching up to the troposphere.

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