Chief Requirements for Orographic Rainfall

 


It occures when the saturated air mass comes across a mountain, it is forcefully lifted. With the expansion of rising air, eventually, the temperature falls, and the moisture gets condensed.  The principal characteristic of this type of rain is that the windward slopes get more rainfall.

After giving rain on the windward side, when these winds reach the other slope, they drop away, and their temperature increases. Then their ability to take in moisture increases and hence, these leeward slopes remain dry and rainless. The region situated on the leeward side is known as the rain-shadow area.


Movement of saturated air mass towards the hill slope.

Forcefully upliftment

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