Chicago is facing a significant risk of glaze icing as a result of recent weather shifts. This phenomenon occurs when rain freezes upon contact with surfaces at or below freezing, creating a transparent and dangerously slippery layer of ice. The National Weather Service has issued advisories for the area, cautioning residents about potential hazards. Glaze icing is particularly insidious because it is difficult to see, making roads and walkways treacherous for both drivers and pedestrians.