Clouds can grow in any direction depending on the type of cloud, the current weather patterns and the wind speed. The tendency is for clouds to grow upward because they are formed by rising air, however, they accumulate much in the way that a balloon gets blown up.
Clouds form when rising air, through expansion, cools to the point where some of the water vapor molecules “clump together” faster than they are torn apart by their thermal energy. Some of that (invisible) water vapor condenses to form (visible) cloud droplets or ice crystals.
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