Well in fact it is fog over Lake Louisa at sunset. I was going to pick up the kids from my parents' who leave near the lake and saw this scene. My wife slammed on the brakes, and I went running for the water's edge as I pull off the lens cover and tweaked the camera settings. Full action landscape photography, who knew? Anyway, I managed to get a handful of shots before the light changed completely, and it was gone. Sometimes you plan these things; sometimes you just get damned lucky.