Advisories from the NWS were in place for New York, Montana, California, Wyoming, Colorado and Alaska early on Friday.

The National Weather Service has simplified some of its winter weather alerts for Wind Chill and Extreme Cold Warnings.

Delivery times for post in over half the country could be impacted due to hazardous weather, the U.S. Postal Service said.

Firefighters continue to fight fires in Los Angeles as strong winds returned to the region, spurring on a new fire near San Diego.

According to the National Weather Service, a polar vortex will impact most of the country this weekend, here is what you need ...