(CNN) — A Nor'easter forming off the East Coast of the United States is expected to bring blizzard conditions by Thursday night to Long Island and Cape Cod.
The complicated storm system "will raise havoc" this week, dumping a foot of snow and spreading sub-zero wind chills across parts of the region, the National Weather Service said.
On top of the bone-chilling cold, much of Long Island, New York, will be under a blizzard warning from Thursday night to Friday afternoon.
"Falling and blowing snow with strong winds and poor visibilities are likely," the Weather Service said. "This will lead to whiteout conditions making travel extremely dangerous. Do not travel."
Across the country, nasty winter weather means many can't travel even if they wanted to. More than 1,000 flights have been canceled for Thursday, according to FlightAware.com, which tracks cancellations due to weather and mechanical problems.
Extreme football weather
Parts of the Midwest will get even colder in the coming days.
In Wisconsin, the Green Bay Packers will give a cold welcome to the San Francisco 49ers on Sunday, when temperatures could bottom out at minus 17.
But it will be relatively balmy Sunday in Cincinnati, Ohio, where snow and rain are possible when the city's Bengals host the San Diego Chargers in another NFL playoff match-up.
Of course, while the players might not have a choice, fans don't have to brave the cold for either game. The big worries are for those who travel in the coming days. Authorities in New York, for example, say they may shut the Long Island Expressway if whiteout conditions make driving along the east-west highway too perilous.