Heavy snowfall is expected across Montana and Washington tomorrow, with road conditions in Idaho, New Mexico and Colorado also likely to be affected.

These maps show the northward and, sometimes, westward movement of freezing temperatures in eastern North America. The shift of this freezing line between snow and rain can mean ice storms in ...

"Moderate to heavy snow over parts of the Southern Cascades and Northern Intermountain Region," the National Weather Service said.

Wintry travel conditions were reported over 750,000 square miles during Tuesday's storm, according to AccuWeather, as more ...