Update – Winter Storm Warning Sunday – Monday
A significant early season winter storm will continue to impact the area through tonight. Rain will continue to transition to moderate to heavy snow from northwest to southeast through this evening. When this transition occurs, conditions will rapidly deteriorate. Meanwhile, strong northerly wind gusts of 40-45 mph will develop by this evening and continue overnight. Blizzard conditions are expected across much of the area, which will cause dangerous and even life-threatening travel conditions. Furthermore, the heavy wet snow and wind may down tree limbs onto power lines, causing power outages. Areas southeast of I-55 and into northwest Indiana will be latest to transition to snow late this evening into the overnight, but can still expect a period of adverse winter weather into Monday morning. Impacts to the Monday morning commute are likely over northeast Illinois and northwest Indiana before the snow diminishes later Monday morning.