FAA Aircraft Dispatcher Practice Exam

What type of circulation is associated with high pressure systems?

1. Counter-clockwise circulations

2. Clockwise circulations

3. Random circulations

4. No circulation

The correct answer is: Clockwise circulations

High-pressure systems are characterized by clockwise circulation in the Northern Hemisphere and counterclockwise circulation in the Southern Hemisphere due to the Coriolis effect. This occurs because air moves from areas of higher pressure to lower pressure. In high-pressure areas, the descending air creates a stability that suppresses cloud formation, often leading to clear skies. Clockwise circulation specifically refers to the movement of air around the high-pressure center in the Northern Hemisphere, while in the Southern Hemisphere, the circulation is counter-clockwise. The typical behavior of high-pressure systems results in calm, settled weather, which contributes to the overall atmospheric stability. Understanding this circulation pattern is essential for predicting weather changes and for effective flight operations.