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In page Coriolis force:

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This pattern of deflection, and the direction of movement, is called Buys-Ballot's law. In the atmosphere, the pattern of flow is called a cyclone. In the Northern Hemisphere the direction of movement around a low-pressure area is anticlockwise. In the Southern Hemisphere, the direction of movement is clockwise because the rotational dynamics is a mirror image there.[2] At high altitudes, outward-spreading air rotates in the opposite direction.[citation needed][3] Cyclones rarely form along the equator due to the weak Coriolis effect present in this region.[4]