Chicago is experiencing sustained 48 km/h winds with gusts up to 68 km/h, which has a noticeable effect on the building I work in. Sears Willis Tower was designed to sway in high winds. Over the years, however, material and building techniques have changed, so occasionally windows blow out of our upper floors. Fortunately this hasn't happened in almost 7 years, but these winds are high enough today that we may have to close the upper floors.
I may pop up to 66 today just to feel it. At that floor, the building can sway almost 3 m. I'm feeling a little dizzy and I'm only a third the way up.