1 P.M. EST

New Jersey Gov. Chris Christie declares a state of emergency, and New York Gov. Andrew Cuomo considers a travel ban for the New York City area ahead of storm that is expected to start in earnest Monday evening.

Snow already is falling in Philadelphia and New York, but the worst is expected tonight and into Tuesday, with 1 to 3 feet across much of the region, affecting 35 million people.

A coastal flood warning has been issued from New Jersey to Massachusetts amid predictions of heavy winds, up to 75 mph in some areas.

Flights canceled: Nearly 6,000, scheduled for Monday and Tuesday.

Philadelphia: Schools close at noon, nonessential city workers to leave two hours later.

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NOON EST

The Northeast shuts down against a snowstorm that could be one for the history books, with some 35 million people in its path in the Philadelphia-to-Boston corridor.

Snow is coming down in Philadelphia and New York, and Boston is up next in the afternoon. The worst of it is expected to hit tonight and into Tuesday, with 1 to 3 feet across much of the region.

Flights canceled: More than 5,000 and counting.