A map from the National Weather Service showed the snow in western counties, including parts of Lake and Cook, through 9 a.m. Through 11 a.m., snow was expected to fall in Central Cook, Will and Kankakee Counties, moving into Northwest Indiana by 11 a.m.

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.

Chicago is experiencing dangerous cold weather with "astonishing" temperatures, as wind chills plunge as low as -23°F, posing significant risks to residents, according to a pricing culture analysis provided to Newsweek.

Trainings for Illinois residents looking to join the National Weather Service's severe storm spotter program will be held virtually for the first time this year. There will also be in-person Community Weather Preparedness training sessions.

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

Tuesday is the coldest day so far this winter, but it was far from a record. The coldest temperature on the books for Jan. 21 was 22 degrees below zero in 1984.

As Chicago braces for dangerously cold temperatures, you may notice some changes in the weather advisories issued by the National Weather Service.

National Weather Service officials are expecting up to an inch of snow Wednesday morning as temperatures hover slightly about 10 degrees in Chicago. Officials said snow fall was expected mainly between 11 a.

Monday, the temperature is expected to drop to minus 3 at O’Hare International Airport. A low of minus 7 is expected at O’Hare Tuesday.

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

The National Weather Service issued two advisories from 6 p.m. Sunday to noon Monday, and from 9 p.m. Monday to noon Tuesday.

Both Monday and Tuesday are non-attendance days for Chicago Public Schools students. Wind chills will be -15 to -30 Tuesday morning and -10 to -20 Wednesday morning.