3 P.M. EST

Rhode Island Gov. Gina Raimondo to residents: Be off the roads by 8 p.m. before the full force of this "multiday event" arrives. And Massachusetts Gov. Charlie Baker issues an indefinite ban on all nonessential motor vehicle travel starting at midnight Tuesday, punishable by a fine of up to $500. What they fear is that the impending winds of 60 to 70 mph and swirling snow will make travel extra-treacherous.

New York City's major stock exchanges say they plan to hold normal trading hours Tuesday despite the crippling load of snow expected in the city. Why? Most trades are now handled electronically.

Airlines: Most major carriers say they'll waive the change fee, typically $200, for passengers who reschedule their travel to or from the Northeast through Tuesday.

Amtrak: Trains will continue to run in the Northeast corridor, but passengers should expect reduced service in the 440-mile stretch between Boston and Washington.

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2 P.M. EST

A spokesman at Manchester-Boston Regional Airport in New Hampshire says all flights likely will be canceled Tuesday — the first time the airport would close in 25 years. The southern part of the state expects about 2 feet of snow.

New York City Mayor Bill de Blasio says streets will be closed to all but emergency vehicles starting at 11 p.m. ahead of the 18 to 24 inches of snow expected. A blizzard warning is now on for the city through midnight Tuesday.

New York: Fire Department plans to have an extra 500 staffers on duty.

New Jersey: NJ Transit shuts down starting at 8 p.m. Monday and commuter trains won't be restored until at least Thursday morning.

Flights canceled: More than 6,000.

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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.