Side story that is pretty funny.. We were out fishing on Cumberland one day when it rolled in like that. We found us a deep cove finger and hung out waiting for it to lift. Waited, waited, waited. Finally said the heck with it and started trolling out of the finger. Got to the mouth and save for that finger, there was no fog left to be seen. We don't know how long we sat there in the cove while it was all clear in the creek.