[dr_lew]

The news says it was around 4:30PM. Sunset for Chicago on Nov. 7 was 4:38PM, so my surmise is that it was some sort of lighting effect at sunset, of which there are many examples.

[spinestein]

That would be my best guess. I've seen a lot of impressive lighting effects at sunset and sundown.


BTW. Venus has moved into the evening twilight again and will be getting brighter and brighter for the next few months. 911 calls of UFO's after sunset (right where Venus is!) always dramatically increase when this happens. :^)