If you're in the Northeast, get ready for the worst blizzard you've seen in years.
The potentially crippling storm could dump as much as three feet of snow in New England. Boston could get up to two feet.
Along with the snow, HLN meteorologist Bob Van Dillen warns that winds could gust to "near-hurricane strength" along the coast.
This storm is even being compared the the historic "great blizzard" of 1978 that killed about 100 people, so no one is taking chances.
Rhode Island, Connecticut and Massachusetts have all declared a states of emergency so far.
More than 3,000 flights are canceled. Boston's Logan Airport is shutting down completely this afternoon. Amtrak is canceling trains north of New York City.
Close to 200 plows and salt-spreaders were on Boston roads before dawn this morning. Mayor Thomas Menino said his city knows how to handle this weather, but also had some simple advice for Bostonians: "stay home."