Did anyone see a huge blue flash last night in southern Ca about 9:00pm?

At about 9Pm last night 05-04-2011, The whole sky as far as i could see in the distance lit up with a bright blue flash that illuminated a couple of times before it got super bright then it was gone. a friend of mine was driving the opposite direction saw it and called me to ask if I had seen it, but he also said it took up whole sky in that direction also. This was huge and no way could have been a transformer blowing, ive seen those before and it is nowhere near the size or brightness of this.