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Relief rainfall - New Zealand

New Zealand's South Island experiences regular relief rainfall. As the warm, moist air from the ocean hits the windward side of the mountain, it is forced to rise. As it rises, it cools and the moisture within it condenses to form water droplets. When the droplets grow large enough, they fall as rain. This process happens two or three times every week, creating the rare temperate rainforest environment. The leeward side of the mountain is much drier.

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3 minutes

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