The end of a long workshop day in the Eastern Sierras, we ended with a sunset shoot at Mono Lake. Clouds were forming, wind was kicking up and the light was changing. I was photographing towards the East, bent over to look for a lens wipe in my bag and as I straightened back up, I saw this brilliant last light illuminating a thunder cloud. I rapidly switched directions and composed this fortuitous image! I am glad I had to wipe my lens! The light lasted quite a while but eventually faded into the gray skies.