Warm air surrounded by cold air rises and spins counterclockwise {cyclone}| in Northern Hemisphere or clockwise in Southern Hemisphere. Earth rotation causes spin direction. Warm air can hold more water than cold air. As warm moist air rises, it cools and condenses water, causing precipitation.
anticyclone
If surrounded by warm air, cold air falls and spins clockwise {anticyclone} in Northern Hemisphere or counterclockwise in Southern Hemisphere. Cold air is drier, so as it rises, it causes clear skies.
density
In Northern Hemisphere, warm air goes north to cooler regions and rises, because it is less dense, and cool air goes south to warmer regions and falls, because it is more dense. Moving air masses can cause air to swirl counterclockwise or clockwise. Cyclone makes warmer, wetter air rise, causing low pressure and wet days. Anti-cyclones make colder, dryer air fall, causing high pressure and dry days.
Physical Sciences>Earth Science>Atmosphere>Wind>Kinds
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Date Modified: 2022.0224