Timeline: When the potentially historic winter storm is expected to sweep across the US this weekend

Here is a timeline of when and where the major winter storm will arrive, and what up-to-date forecasts predict it will deliver.

Winter storm warnings issued in 19 states as 17 inches of snow to hit

Heavy snow, ice and subzero wind chills threaten to snarl travel, strain power grids and disrupt Monday commutes for millions.