Temperatures will plunge into the single digits by early Sunday, and likely won't rise above the single digits until Wednesday.

A dangerously cold stretch of weather is arriving in the Chicago area on Sunday, and the frigid temperatures bring a lot of health and safety concerns. Chicago's Office of Emergency Management and Communications is activating warming centers around the city to give people a place to go if they need it.

Bitter cold temperatures and wind chills far below zero are expected in the Chicago area Sunday, Monday, Tuesday and Wednesday.

A piece of the polar vortex spills into the Midwest, creating extreme cold for the Chicago area and northwest Indiana for the next few days. For Sunday morning, actual air temperatures will peak early and fall throughout the day.

The National Weather Service has issued a cold weather advisory for the entire Chicago area, taking effect at 6 p.m. Sunday as dangerously cold temperatures move into the region. The advisory is slated to remain in effect until 12 p.