Two days after christmas, it was very warm, so my friend and I were sitting outside on the porch in the evening talking. Suddenly, we saw a brilliant flash of beautiful blue to blue-green light, illuminate the entire sky for an instant. After about 5 seconds, there was a second flash of this same colored light. No sound, no thunder, no lightning. All the clouds lit up. There was nothing else to be seen. I can't emphasize enough how beautiful this light was. I noticed that a similar event was recorded in Auburn Hills on the NUFORC website on Dec. 24, 2008.