The first major winter storm of the year that stretched across the U.S. is continuing its deadly journey eastward, where cities in the mid-Atlantic, like Washington, Baltimore and Philadelphia, are now experiencing significant impacts from heavy snow and ice.

The storm caused thousands of flights and dozens of train trips to be delayed or canceled. At Ronald Reagan National Airport in Washington, all runways were closed Monday evening.

A major winter storm is set to cover large swaths of the U.S. in ice and snow, affecting millions of Americans.