Let's say that the weather man made a mistake, using the word mirage. Even though a mirage is a type of phenomenon of light refraction. Since the Chicago skyline is not visible most of the time, there are other factors at work here. No one should disagree that water tries to seek level. This is however effected when it is effected by currents, tides, wind, barometric pressure and yes gravity. The conditions of this experiment were not given. What was the water temp, air temp, wind speed, air quality, currents...
This was a witch hunt and may have proven 1 person was wrong. This was in June, which means hot air and cold water. This is the recipe for light refraction.