Heavy West Coast rain means mudslides threaten fire-ravaged California. Millions of Americans elsewhere get snow, rain, extreme cold and some tornadoes.

A winter storm that brought snow, sleet and freezing rain to a large swath of the Midwest swept into the mid-Atlantic and Northeast on Thursday, causing treacherous travel conditions, prompting school delays and closures and potential power outages for millions of Americans.

Following a mostly quiet and even mild start to the week across a large part of the eastern half of the nation, a large, multifaceted storm is expected to take shape by the middle of the week that can bring a variety of impacts,

Travel will become treacherous Tuesday through early Wednesday in much of Virginia and West Virginia, the National Weather Service said.

Storm Freya whipped from the Midwest into the Northeast Thursday, coating roads in slick ice from Baltimore up the I-95 corridor, making for dangerous commutes and forcing school closures and delayed openings.

Over 80 million people are under winter weather alerts, spanning from coast to coast, as snow and rain are already underway in the Ohio Valley.

Winter weather alerts are in effect for portions of the Ohio Valley and mid-Atlantic, including Washington, D.C., as a powerful winter storm sweeps into the region, bringing heavy snow and ice that could lead to power outages and travel delays.