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,
reporter: in these kind of investigations, especially here in russia, especially with what we ve been seeing, when they start they always say all options are open. that said, no one s really said they re going to pursue a serious terrorism lead. it really seems on so far that it becomes the weather. obviously they have to look at the black box and everything else but it doesn t seem to be going in that direction. do we know anything about the pilot s communications? i d just suggest the weather channel with which we are affiliated has posted some information about the weather conditions at the time. heavy fog, visibility near zero, temperature 34 degrees, dew point 34 degrees, winds should not have been a factor, they were merely coming out of the southeast 5 to 10 miles per hour. but that visibility point is very disturbing. do we know if there was discussion from the pilot about perhaps rerouting? landingi inin inin ining elsewh?