Residents across western Washington are being warned to brace themselves, as severe flooding is expected to get significantly worse. New video shows how heavy rain has already surged into neighborhoods, with mudslides and flooding shutting down dozens of roads. Watch this for the latest as a second round of rain from an atmospheric river hits the region.

A significant atmospheric river is slamming into the Pacific Northwest. While some of these can be beneficial, this one could bring record flooding for some, and landslides. Here's the latest forecast.

Reinforcing shots of cold air will continue to dive into the Northern Plains and Midwest this week. The coldest air will move in Friday, Saturday and Sunday, and wind chills will drop well below zero for many, including Minneapolis, Chicago, Kansas City and St. Louis. Watch this to see how cold it will get.

The Midwest clipper is moving across the Great Lakes and will move into the Northeast Wednesday. A swath of 3-5 inches looks likely for many with some of the higher elevations in upstate New York forecast to see over 1 foot of snow. On top of that, it will be windy, especially in the Appalachians where blizzard warnings are in effect. If you must travel, make sure you have a winter emergency kit with you at all times. Check your hour-by-hour forecast here.

A weak La Niña is poised to give northern U.S. ski regions a major leg up this December, stacking the deck with storm potential and fresh powder. From the Cascades to New England, the northern tier looks ready to carve ahead, while southern portions of the Rockies and Appalachians may struggle to keep up.