Fred Wilson sends:

Thanks for this to Gerry Mason

Time lapse of a cloud phenomena called 'Arctic Smoke' on Okanagan Lake, near
Kelowna B.C. Canada This occurs when a very cold mass of air encounters a
relatively warm body of water, typically when the air is about -18C in the
Okanagan Valley. http://www.flyok.ca/

https://www.youtube.com/watch?v=lbmW2tCmyNg