New York City and other areas in the north-east US have shut down, with forecasters warning residents to expect "crippling" amounts of snow.
Forecasters say Winter Storm Juno could dump over 75cm in some parts of New Jersey, Maine and New Hampshire.
Boston, which is seeing some of the heaviest snowfall, has stopped public transport and car travel.
Up to 60 million people are thought to be affected by the bad weather.
Businesses and schools closed early on Monday with many not expected to reopen before Wednesday at the earliest.
Iwan lives in Boston on the East Coast of the USA, and he told us what the snow was like where he lives.