UNDATED (CBS) -- It hasn't even started snowing, but we're already seeing the effects of the storm.
About 3,000 flights have been cancelled throughout the northeast, including at major hubs like Boston's Logan Airport, the three major airports that serve New York City.
For those who aren't traveling, there are just a few hours left to get what they need before this potentially historic snowfall begins.
The salt trucks are ready as the northeast prepares for a major winter storm. New York City Mayor Michael Bloomberg says, "The good news I guess, if you like snow is that we're gonna have some."
Snow has already begun falling Friday morning, but the heaviest accumulation won't come until tonight and into tomorrow. Massachusetts could be hit the hardest. David Bernard, Chief Meteorologist WITH WFOR Miami says, "During the day Saturday, a full blown blizzard for southeastern New England."
The impact of the storm was already being felt even before it hit. Airlines have cancelled thousands of flights into and out of the region.
Forecasters are predicting this storm could be as bad as the December 2010 storm that cost retailers more than a billion dollars in sales as businesses closed and many customers were stranded in their homes. Boston Mayor Thomas Menino says, "We have a significant snow storm headed our way. First snowstorm we've seen of this size in many years."
Menino urged residents to stay home today. He says, "We are hardy New Englanders, let me tell you, used to these types of storms. But I also want to remind everyone to use common sense. Stay off the streets of our city."
And many people are listening to the warnings and stocking up on supplies and essentials.
Officials in Massachusetts want all shopping to be completed before noon today. The record for snow in Boston is a little more than 27-and-a-half inches.