BOSTON (AP) – A blizzard of potentially historic proportions threatened to strike the Northeast with a vengeance Friday, with up to 2 feet of snow feared along the densely populated Interstate 95 corridor from the New York City area to Boston and beyond.

From Pennsylvania to Maine, people rushed to stock up on food, shovels and other supplies, and road crews readied salt and sand, halfway through what had been a merciful winter.

Before the first snowflake had even fallen, Boston, Providence, R.I., Hartford, Conn., and other New England cities canceled school Friday, and airlines scratched more than 1,700 flights, with the disruptions certain to ripple across the U.S.