​Winds

Wind is “the movement of air relative to the surface of the earth”. Wind blows due to the difference in horizontal and vertical gradient of atmospheric pressure. Pressure can be the reason behind distribution of winds. On the surface of earth, wind blows around low pressure that is cyclones or high-pressure anticyclones region. Winds generally have clockwise rotation in and around southern hemisphere while flows counter-clockwise in northern hemisphere.

Measurement of wind

Wind is a vector term expressed as speed and direction (from which the wind is blowing). There are different types of instrument used for measuring winds such as:

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