The National Weather Service NEXRAD radar in Portland that tracks rain, snow and sleet across northwest Oregon went out for about five hours Thursday morning but was back on by about 10:40 a.m., officials said.

Heavy snow, freezing rain and temperatures as much as 35 degrees below seasonal averages are set to hit large parts of the United States as a string of storms confirm that winter is far from over.

A procession of winter storms is forecast to bring snow, sleet, ice and potentially flood-inducing rain to sprawling bands of the U.S. this week.