Lake-effect snow in Buffalo: What is it? What's the cause?

The Buffalo region of the US has been hit by 'lake-effect snow' – a cold air that sweeps across the Great Lakes and sucks up moisture that falls as snow.

A Lake-Effect Snowstorm in New York Dumps 4 Feet of Snow on

Buffalo and Cleveland share a lake, but lake-effect hits way

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What causes lake-effect snow like Buffalo's extreme storms?

Rochester NY Weather: Lake effect snow warning issued for region

What is lake-effect snow?

First Major Widespread' Winter Weather Event Could Cause Absolute

What causes lake-effect snow?

Lake-Effect Snow and the November 2014 Buffalo Storm – wildcard

Buffalo's deadly blizzard by the numbers: What made the storm so