What is one effect of high humidity in meteorological terms?

High humidity in meteorological terms directly impacts the atmosphere's capacity to hold moisture. When the humidity levels are high, the air is saturated with water vapor, which means it is conducive to the formation of dew and fog. Dew occurs when the air cools and the water vapor condenses on surfaces, forming tiny droplets of water. Similarly, fog forms when the temperature of the air drops to the dew point, causing the water vapor in the air to condense into tiny water droplets suspended in the air, significantly reducing visibility.

The other options illustrate concepts that do not align with high humidity effects. For example, high humidity does not reduce precipitation chances; rather, it often enhances them. It also does not increase evaporation rates because when humidity is high, the air is already saturated, reducing the potential for further evaporation from surfaces. Lastly, high humidity is indicative of moist atmospheric conditions, not dry ones, making the selection of dew and fog formation the most accurate reflection of the effects of high humidity.