Boslandew
Just a quick question:
If I were standing in a fog patch (possibly 'hill fog'), and even if others were too; how could we know what people standing outside that fog patch could see? Or indeed how far those conditions extended?
Of course if we had evidence from someone who was outside that hill fog, a yachtsman perhaps, he may be able to enlighten us??
However, if the implications of such approximation of weather were significant, perhaps we would err on the side of caution, rather than on the side of certainty, when reaching a conclusion?