High pressure systems are characterized by which of the following?

High pressure systems are characterized by which of the following?

• A. Air is DENSER and sinks, moves clockwise (outward) in the Northern Hemisphere, dry and clear weather
• B. Air is LESS DENSE and rises, often bringing rain
• C. Winds rotate counterclockwise and bring storms
• D. They cause tropical storms

Answer: (A)

High pressure systems involve sinking, denser air that suppresses vertical motion. As air descends, it warms slightly and clouds struggle to form, giving dry, clear skies. In the Northern Hemisphere, the Coriolis effect makes surface winds around a high rotate clockwise and flow outward from the center. This combination—dense air sinking and outward clockwise surface flow—produces the dry, settled weather typical of high pressure. The other descriptions point to different situations. Air that is less dense and rises is characteristic of low pressure, which often brings clouds and rain. Winds rotating counterclockwise and bringing storms are also linked to low-pressure systems. High pressure generally does not cause tropical storms; those form in warm, moist conditions around low-pressure centers in tropical regions.

High pressure systems involve sinking, denser air that suppresses vertical motion. As air descends, it warms slightly and clouds struggle to form, giving dry, clear skies. In the Northern Hemisphere, the Coriolis effect makes surface winds around a high rotate clockwise and flow outward from the center. This combination—dense air sinking and outward clockwise surface flow—produces the dry, settled weather typical of high pressure.

The other descriptions point to different situations. Air that is less dense and rises is characteristic of low pressure, which often brings clouds and rain. Winds rotating counterclockwise and bringing storms are also linked to low-pressure systems. High pressure generally does not cause tropical storms; those form in warm, moist conditions around low-pressure centers in tropical regions.