The official temperature at O'Hare got up to 15°C this afternoon, which you'd expect in early April and not in mid-February. That's the good news. The bad news is the warm air mass is being driven by converging jet streams more or less directly over Chicago, giving us 67 km/h winds gusting to—I am not making this up—100 km/h. Buildings in the Loop are being evacuated because windows are popping out. Also, people are giving cranes wide berths.
Have I mentioned that anthropogenic climate change will (a) be pretty good for Chicago, for a few decades anyway, and (b) pump more energy into the atmosphere causing these kinds of wind events?