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Orographic Effect

Rain Shadowing

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OROGRAPHIC LIFTING

Where the flow of air is forced up and over barriers such as highlands or mountains. Moist air being forced aloft begins to cool, consequently condensation forms, and rain or snow begins to fall. By the time the air reaches the leeward side of the barrier, it sinks and warms, resulting in decreasing relative humidity, cessation of precipitation, and the dissipation of clouds. May be called an orographic uplift.

Orographic Effect Animation

http://hmxearthscience.com/Warehouse/meteorology/climate/animations/Orographic%20Effect.s

RAIN SHADOW

A rain shadow is a dry area on the lee side of a mountainous area (away from the wind). The mountains block the passage of rain-producing weather systems and cast a "shadow" of dryness behind them.

What is the Orographic Effect?

A change in atmospheric conditions caused by a change in elevation; primarily due to mountains.

This effect tends to leave a distinctive look to the mountains it touches.

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