Question

Orographic rainfall explain in detail

Answer 1

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• “Orographic” rainfall is also sometimes called “Orogenic” rainfall.

• We get this term from the Greek oros, meaning ‘mountain’.

• This occurs when moist wind ward sides of many mountain ranges receive heavy precipitation.

• Whereas the leeward sides along which the air moves down receives less rain fall.

• Such situation occurs widely along the western coast of India.

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→ The moist air from the Arabian sea is forced by the western ghats to rise up resulting in expansion, cooling and rainfall.

→ On the other side of the western ghats, the descending wind is devoid of moisture and hence, does not give the rain in the central part of Deccan plateau.

→ Hence this region is dry and is known as rain-shadow region.

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