There a specific visibility point when the mist becomes fog? public service fog is 200 metres. it is all about how far you can see. we have observations across the uk either somebody going out in the middle of the night every hour or every half an hour looking at how far they can see, although there are automatic observation networks as well. that is my favourite fact of the week. fascinating. what do you put on your cv. fog isjust like having your head in the cloud. clouds are made up head in the cloud. clouds are made up of tiny water droplets, that is what fog is made up. some of us live in a permanent state of fog in the case. thank you very much. well i never. you learn something new every day. let s have a look at some of today s front pages. like many of the papers,