I had just walked out onto the patio and sat down to finish a report for work after some friends had left after the circus they went to at The Nutter Center. It was a very bright flash such as lightening but lit up the entire western/southwestern sky. I knew it wasn't heat lightening and that it wasn't suppose to rain until Sunday so I was confused as to what it might have been. I thought perhaps an explosion but I didn't hear anything like sirens or the sound that an explosion would of course make. It happened very fast and was then gone.