A major winter storm was moving up the Atlantic Coast on Friday night, with forecasters expecting accumulations of one to two feet of snow in some areas by Saturday night, according to the National Weather Service.

Winter storm warnings were in effect from Tennessee and North Carolina to the southern New England states, and the storm was expected to affect Washington, Baltimore, Philadelphia and other cities. A blizzard warning was in effect for Long Island.

The National Weather Service said travel conditions in those areas would be “extremely treacherous” by Saturday morning.