Final answer:
When an air mass cools to its dew point, relative humidity increases due to the condensation of water vapor, leading to cloud formation and precipitation.
Explanation:
As an air mass cools to its dew point, the relative humidity increases because the air reaches saturation and water vapor begins to condense into liquid water. This process can lead to the formation of clouds and eventually precipitation. The cooling of the air causes the water vapor to change state, resulting in higher relative humidity levels.
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