Fog

As you probably know from recent blips, our house is in a frost hollow.  One of the characteristics of a frost hollow is that cold air runs down the hills around the hollow and settles in it, if the air is very damp and the temperature drops below its dew point we have a fog.  So most frost hollows are also fog hollows.  This was the case here for a fair part of this morning and when this picture was taken the visibility was only about seventy metres.