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How do rain shadows make one side of a mountain much drier?

ClimateGeography

Quick Answer

Moist air rises over a mountain, cools, and drops rain on the windward side, then descends warmer and drier on the leeward side. This creates a rain shadow.

The Full Story

When moist air is forced up a mountain range, it expands and cools. Cooling causes water vapor to condense, leading to clouds and precipitation on the windward side. After crossing the summit, the air descends, compresses, and warms, which lowers relative humidity and inhibits rain. This effect helps create dry regions downwind of mountain ranges, such as areas leeward of the Sierra Nevada or the Andes.

Key Facts

1.Air cools as it rises and warms as it descends
2.Rain shadows are common behind major mountain ranges
3.The effect can produce deserts and semi-arid regions

YouTube Angle

Suggested video title for this topic:

"One mountain can create a wet forest on one side and a desert on the other"