The stage is set for a tornado outbreak this Sunday with Chicago in the danger zone.
AccuWeather.com meteorologists are particularly concerned for an outbreak of devastating tornadoes across northern and eastern Illinois, far southeastern Wisconsin, Indiana and southwestern Michigan.
Chicago is among the cities in the heart of this threat zone.
As of Sunday afternoon, a tornado was confirmed near the Chicago suburb of Frankfort.
At Soldier Field, where the Chicago Bears are hosting the Baltimore Ravens, officials asked fans to seek shelter immediately due to the severe weather threat. Gameplay was also halted until further notice.
In addition to tornadoes, the strongest thunderstorms targeting the lower Great Lakes and Ohio Valley will be capable of producing damaging winds, blinding downpours and frequent lightning.
The line of violent thunderstorms and tornadoes is expected to cross Chicago during the early afternoon, putting lives and property in danger.
All residents and visitors to Chicago on Sunday are urged to heed all severe weather-related watches and warnings during this dangerous situation.
Strong winds following the line of severe weather later Sunday afternoon and evening could lead to additional damage as the city dries out.
Noticeably cooler air will also arrive Sunday night, sending temperatures down into the 30s. Temperatures will only rebound into the lower 40s on Monday with even colder AccuWeather.com RealFeel® temperatures.
Snow will linger across parts of the northern Plains to the Upper Midwest as December begins.
December will begin with a roar across the Northwest as rounds of rain, mountain snow and even ice are in store this week.
Downpours will continue the threat for flooding across parts of southern India this week.
Tens of thousands will gather in rainy and mild conditions at 30 Rockefeller Plaza in New York City on Wednesday, Dec. 2, 2015, for the 83rd annual Christmas tree lighting.
As the Northern Hemisphere plunges into winter, the night sky will come to life with several notable astronomical events throughout the season.
Rain will return across much of the eastern U.S. to begin the last month of 2015.
Erie Canal (1831)
Coldest December ever closed Erie Canal.
Snow fell for 5 minutes in South Florida in the Ft. Myers area.
Eastern Maine (1964)
Down east blizzard 12-18" snow, accompanied by 60 mph winds; 8' drifts. Record snow from Detroit to Pittsburgh: Pittsburgh, PA 8.5" snow, most for date Akron-Canton, OH 24" snowstorm Dec. 1-2 - biggest snowstorm on record Detroit, MI Record 19.2" snow paralyzed city.