derekbaxter24 said:The sky looked clear except for the plant fire, I have a good feeling the comet would have been visible for a while.
The sky is pretty obviously cloudy in this video
http://www.youtube.com/watch?v=d9S7yVbqcmg
So, as I said, putting cloud cover at about 3,000ft (for example), the meteorite would have been visible for a fraction of a second before impact/detonation.