Millions of people from the Midwest to the Northeast are on alert as a developing winter storm is expected to bring a potentially crippling ice threat that could knock out power and lead to treacherous travel conditions across the region.

A developing winter storm could bring a potentially crippling ice threat from the Midwest to the Northeast, and the West Coast remains on alert for flooding as a series of atmospheric river storms swamps the region.

A powerful winter storm is expected to bring a swath of potentially crippling ice from the Midwest to the Northeast starting Wednesday that could lead to power outages and wreak havoc on travel across the region.