I was driving home this late evening, and was impessed by strong wind moving clouds fast in sky. I thought, that direction of moon could be in good place for taking the shot on little lake in neigbourhood... It was not easy to figure out proper exposure time, as clouds were moving fast and one couldn't know, whether there will be more or less moonlight during 30 seconds. Fortunately I had time for experiments and made several shots. This one is best to express the mood.