ACS Weather Information Practice Exam

A high-pressure system is generally associated with fair weather and clear skies. This occurs because high-pressure systems result in descending air, which inhibits cloud formation and leads to stable atmospheric conditions. As air descends, it warms, reducing humidity and making it less likely for condensation to occur, which is essential for cloud and precipitation development.

In contrast, other weather phenomena often correlate with different atmospheric pressures. For example, low-pressure systems are more likely to bring stormy conditions and precipitation because they promote rising air, which cools and can lead to cloud formation and storm activity. Additionally, high pressure typically signifies drier air masses rather than cold and humid ones. Lastly, while high-pressure systems can influence wind patterns, they are not primarily marked by increased wind speed and variability; instead, these characteristics are often more associated with the boundaries between different weather systems. Therefore, the occurrence of fair weather and clear skies aligns well with the characteristics of high-pressure systems.