WATCH: NYC Mayor Eric Adams issues warning as extreme snow batters city

A powerful, fast-moving winter storm was blanketing the US Northeast on Tuesday with heavy snow, creating treacherous driving conditions for millions of Americans, while forcing schools to close and wreaking havoc on air travel.

The National Weather Service said that than 30 million people from West Virginia northeast into New England were under a winter storm warning as the Nor'easter pummelled parts of the area with as much as six inches (15cm) of heavy, wet snow overnight.

New York Mayor Eric Adams has called on New Yorkers to not use the roads as the extreme conditions batter the city.

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