Dangerously cold air moved into the Chicago area early Sunday with subzero wind chills expected to last through Wednesday. A cold weather advisory remains in effect through Monday across all of northern and central Illinois.Monday and Tuesday morning are expected to be the coldest periods of the stretch, according to the National Weather Service. Wind chills could drop to minus 23 degrees in downtown Chicago on Tuesday morning. As of Sunday morning, the temperature at O'Hare Airport was 6 degrees with a wind chill of minus 11. Sunday is expected to see a high of 12 degrees in Chicago and a low of minus 5, which with windchills could feel like minus 15. Lake effect snow showers are possible Sunday night in northwest Indiana. The National Weather Service encourages everyone to limit outdoor time and cover all exposed skin while outside, as people could develop frostbite in less than 30 minutes. Sub-zero wind chills have arrived and are here to stay through Wednesday morning. The bitter cold will lead to rapid ice formation on area rivers which may lead to ice jams and very localized flooding. (1/3) pic.twitter.com/SzrAP0sMvk— NWS Chicago (@NWSChicago) January 19, 2025 The city will have one warming center open at Garfield Community Service Center, 10 S. Kedzie Ave., from 8 a.m. to 8 p.m. Sunday and Monday. All six of the city’s warming centers will be available Tuesday through Friday between 9 a.m. and 5 p.m.Advocates for the unhoused, health organizations, other activists and officials, including nine alderpeople, signed a letter urging city officials to expand capacity at warming centers and keep them open 24 hours.Other facilities, such as libraries, also serve as warming centers and sometimes have different or longer hours. The following centers will be open beginning at 9 a.m. Tuesday: Garfield Community Service Center10 S. Kedzie Ave.(312) 746-5400Englewood Community Service Center1140 W. 79th St(312) 747-0200Martin Luther King Community Service Center4314 S. Cottage Grove(312) 747-2300North Area Community Service Center845 W. Wilson Ave.(312) 744-2580South Chicago Community Service Center8650 S. Commercial Ave.(312) 747-0500Trina Davila Community Service Center4312 W. North Ave.(312) 744-2014Cook County will open three courthouse warming centers beginning at noon Sunday, which will run continuously until Wednesday afternoon. The Cook County locations are:Skokie Courthouse: 5600 Old Orchard Rd., SkokieMaywood Courthouse: 1500 Maybrook Dr., MaywoodMarkham Courthouse: 16501 S. Kedzie Ave., MarkhamThe Salvation Army’s Freedom Center in Humboldt Park, 825 N. Christiana Ave., will be open 24 hours as a warming shelter throughout the week. The organization also runs the 24-hour Shuttle of Hope, which works with the city’s 311 call center to transport people to shelters.Chicago’s Office of Emergency Management and Communications has also provided several tips for people to stay warm:Motorists should take extra precautions to winterize vehicles and have necessary supplies on-the-go. Keep in mind, disabled vehicles or distracted driving can cause accidents, impact traffic and impede responders heading to emergencies.Residents should know the signs and care of frostbite and hypothermia. For winter preparation information visit, Chicago.gov/OEMC for details and links to other local, state and federal resources.Avoid unnecessary trips outside. When going out, limit the time outdoors.Wear several layers of loose, warm clothes.Keep head, hands and feet covered when outdoors.Stay dry because moisture can reduce the insulation effectiveness of clothing.Pay extra attention to daily needs: get enough sleep, eat high-energy foods, drink warm beverages to keep the body warm and avoid alcoholic beverages.Keep pets indoors as much as possible during bitter, numbing cold.