Fog. Frost. Freezing fogs and frosts. Fog was rolling down the valley past our place this morning. It seems to mimic the water - all the tributaries meeting at the main flow. The rivulet flows down into the Derwent River, and our little stream of fog follows along above it and joins the massive bank of fog going down the Derwent. The river fog here is called Bridgewater Jerry for some reason lost in time.
Question - does the fog come up from the water? Or does the fog originate in some mystical way at the same source as the water and just follow it? Water follows contours, and so does fog, but fog has a bit of extra gaseous freedom that lets it waft around with the wind.
So, in closing: fog eh?