Blizzard warnings were issued Saturday for New York City, New Jersey and coastal communities along the East Coast as a late-winter storm set to arrive on Sunday threatened to make a mess of the start of a new week.

The National Weather Service increased its assessment of the potential severity of a storm that was projected to be less ferocious only days earlier.

The weather service said 1 to 2 feet (about 30 to 61 centimeters) of snow was possible in many areas as it issued blizzard warnings for New York City, Long Island, southern Connecticut and coastal communities in New Jersey and Delaware. Flooding was also possible in parts of New York and New Jersey, the weather service said.