What is one outcome of decreasing the temperature of a saturated air parcel?

Decreasing the temperature of a saturated air parcel leads to cloud formation primarily due to the ability of cooler air to hold less moisture. As air cools, the capacity for water vapor decreases, and once it reaches a point known as the dew point, the water vapor begins to condense into tiny water droplets or ice crystals, forming clouds. This process occurs because cooler air can no longer remain saturated with water vapor, which triggers condensation. The formation of clouds is a fundamental process in meteorology, representing a crucial part of the larger atmospheric dynamics.

In contrast, a decrease in temperature does not typically result in a significant decrease in pressure in a direct sense; while colder air is denser and can contribute to localized pressure changes, it isn't a direct outcome of cooling alone. Additionally, lower temperatures tend to enhance moisture conditions, rather than create dry air conditions, since the air is already saturated. Lastly, decreased temperature typically leads to reduced rates of evaporation, as warmer air is generally more capable of evaporating water.