Explain the mechanism of the south-west monsoon in India.

In summer the landmass of northern India heats up strongly and a low pressure area develops over the north-west, while the Indian Ocean remains comparatively cool and has higher pressure. Air therefore moves from the sea towards the land. These moisture-laden winds cross the equator, are deflected to the right by the Coriolis force, and reach the subcontinent from the south-west. On striking the Western Ghats and the Himalayas they are forced to rise, cool and give heavy rainfall.

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Explanation

The reversal of pressure and wind direction between summer and winter is the defining feature of a monsoon climate.