Overview
- More than 18 million people are under winter weather alerts across the West and Midwest, according to the National Weather Service.
- Heavy mountain snow persists in the Northern Rockies, with higher peaks likely topping a foot and Colorado under mountain warnings and advisories.
- Snow is spreading from South Dakota to northwest Illinois with 4–6 inches common, Chicago under a 2–5 inch advisory, and slippery roads reported overnight in parts of Iowa and Wisconsin.
- A sharp cold outbreak late Sunday into Monday could push temperatures below zero in portions of the Dakotas and Minnesota.
- A separate series of Pacific systems is set to deliver prolonged heavy rain to western Washington and Oregon, with flood watches posted and a 5–10 day threat highlighted by forecasters.