Why cyclones are anti clockwise in northern hemisphere?
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Answer:
Hurricanes and cyclones are low pressure systems. When they form you'd expect the surrounding higher pressure air to flow in radially. But minute forces, caused by the earth's rotation, make the wind flowing towards the low pressure rotate - anticlockwise northern hemisphere, clockwise southern. They're called Coriolis forces. Now imagine a low pressure forming in the southern hemisphere. The first tiny breezes trying to fill the low pressure are made to rotate in a clockwise direction. The low pressure deepens and what was a breeze is now a cyclone. If the cyclone now moves north across the equator the Coriolis forces - now anticlockwise - will try to reverse the rotation, but they're far too small to have any effect. The cyclone will continue to rotate in a clockwise direction.
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Answer:Cyclonic rotation or circulation is movement in the same direction as the Earth's rotation, as opposed to anticyclonic rotation. The Coriolis effect causes cyclonic rotation to be in a counterclockwise direction in the northern hemisphere, and clockwise in the southern hemisphere. A closed area of winds rotating cyclonically is known as a cyclone.