Winds move in a direction in the northern hemisphere and in a direction in the southern hemisphere because of the coriolis effect.

To firstly answer this question, you must know what the Coriolis effect is. In simple terms, it can be defined as something that causes displacement - making things move at a curve, rather than a straight line. This aforementioned effect applies to winds within the hemispheres. Here's how this effect messes with the winds.

Winds move in a counterclockwise direction in the Northern Hemisphere and in a clockwise direction in the S. Hemisphere.

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