Organic Rainfall | Class VII

Relief rainfall or orographic rainfall is caused by the relief or orography of the land.
• When moisture-laden winds encounter mountains or hills, the air is forced to rise up the slope of the mountains. When air rises, it cools, condenses and forms clouds.
• When the dew point of the air is reached, it can no longer hold all its water, which comes down to the Earth as heavy rain.
One of the best examples of orographic rain is the monsoon rains that occur -along the Western Ghats and the Himalalayan foothills. When the moisture-laden monsoon winds hit the Western Ghats and the Himalayas, the air mass is forced to rise. Monsoon winds bring copious rainfall to the windward side of these mountain ranges.


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