The Coriolis Effect is incredibly important to global weather patterns. It is caused by the Earth's counter-clockwise rotation along its axis. As the Earth rotates on a tilt, uneven heating of the Earth's surface causes wind patterns to be created and to be deflected to the right in the Northern Hemisphere and to the left in the Southern Hemisphere.
The Coriolis Effect has a direct affect on the formation of cyclonic weather systems. For example, in the Southern Hemisphere, the Coriolis Effect causes storms to swirl clockwise. In the Northern Hemisphere, the Coriolis Effect causes storms to swirl counter clockwise. Many large-scale weather patterns, such as hurricanes, exist because of the Coriolis Effect. Trade winds, which are winds that blow toward the Equator, from northeast to southwest in the Northern Hemisphere and from southeast to northwest in the Southern Hemisphere, are also formed by the Coriolis Effect.