What happens to the air and wind that causes high-pressure systems?

Warm air sinks and wind blows outward.

Cool air rises and wind blows inward.

Warm air rises and wind blows inward.

Cool air sinks and wind blows outward.

Warm air sinks and wind blows outward. This creates an area of high pressure at the surface of the earth. High-pressure systems are generally associated with clear skies and stable weather conditions.