The arctic air will persist through at least Wednesday morning. Early Tuesday morning, wind chill readings ranged from -20 to -35 degrees, with colder wind chills for areas north and west of the city. With wind chills, this dangerously cold, frostbite, and hypothermia could happen on exposed skin within 30 minutes or less.

CHICAGO — National Weather Service officials issued a cold weather advisory in effect until 2 p.m. Tuesday for portions of central, east central and northeast Illinois as well as northwest Indiana. Officials said dangerously cold wind chills may reach as low as 28 below zero causing frostbite to those exposed to the frigid temperatures in as little as 30 minutes.

A cold weather advisory has been extended across the entire Chicago area, with warmer temperatures slowly creeping into the forecast.

The Chicago Bears announced Tuesday that the team had reached an agreement with former Detroit Lions offensive coordinator to become the new head coach in the Windy City.

Ben Johnson made a quick decision. Aaron Glenn could be next. With Johnson heading to Chicago and Mike Vrabel already in New England, five head coaching vacancies remain. The Jets, Saints, Jaguars, Raiders and Cowboys are still in the hunt.

The Chicago Bears cast their hooks in many directions this month as they navigated the waters of their coaching search. The team announced interviews with 17 candidates over a period of 12 days — from Mike Vrabel to Eddie George.