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INTRODUCTION Fair-weather-cumulus clouds are the "puffy" clouds you see on a nice summer day. They are often flat at their bases and rounded at the top. The distance from the base olouds to the earth surface is often the same for a group of clouds in the same area. Clouds can only form if the dew-point temperature is reached. Since the air temperature decreases with height above the earth's surface, clouds may form if the air temperature is cold enough to be at the dew-point temperature. As an unsaturated air parcel rises (relative humidity, RH