Winter weather advisories or winter storm warnings are in place for nine states across the U.S. as of early Tuesday morning, and up to nine inches of snow is forecast by the National Weather Service (NWS) in some parts of the country.

The NWS has issued winter weather advisories for parts of upstate New York, with lake effect snow expected to impact travel. Here's how much snow to expect.

The NWS has issued warnings this weekend after a powerful polar vortex plunged temperatures nationwide during the week.