A major winter storm set to slam the U.S. later this week has shifted its path slightly before it arrives on Friday.

The major storm is set to hit starting on Jan. 23 and will stretch into the weekend, spreading snow and ice from the southern Plains to the Northeast.

Several emergency declarations have already been issued as a massive winter storm barrels toward more than 35 states, putting more than 200 million people in its path and threatening “considerable disruption” to New York with up to a foot of snow.

A major winter storm is set to spread heavy snow and damaging ice across a large portion of the United States over the coming days. Dangerously cold temperatures will only worsen the storm and increase its danger.

Large parts of the eastern and central United States are expected to see heavy snow. But south of the snow line, forecasters are warning that the storm could deliver dangerously icy conditions. Exactly where that snow vs. ice line will fall was still uncertain on Wednesday.