Chicago is currently under an Extreme Cold Warning as temperatures have plunged far below zero, creating dangerously cold conditions. According to CBS News, the city is experiencing severe cold weather, with wind chills making the temperatures feel even lower. The advisory warns residents of the potential for frostbite and hypothermia due to the extreme cold. The cold weather advisory also notes that Friday night will be cloudier, which may contribute to the chilling conditions. The phenomenon of 'exploding trees' has been reported, which occurs when the sap inside trees freezes and expands, causing the bark to crack. This unusual occurrence highlights the severity of the cold snap affecting the region.