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- Dictionarylake ef·fect snow
noun
- 1. snow falling on the lee side of a lake, generated by cold dry air passing over warmer water, especially in the Great Lakes region.
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noun
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Lake-effect snow is produced during cooler atmospheric conditions when a cold air mass moves across long expanses of warmer lake water. The lower layer of air, heated by the lake water, picks up water vapor from the lake and rises through colder air. The vapor then freezes and is deposited on the leeward (downwind) shores. Wikipedia