Whats the difference between the 3 of them ??

[Ironduke]

Whats the difference between Fog, Mist and Haar
Thanks in advance

[Catso]

Never haard of haar - what is it?

Mist and fog: it used to be a just the degree of visibility. Mist was visibility down to (say) 1km, fog if it were less than that.

[heathfield]

'Haar' is sea fog. It's the dense kind that rolls inland on a hot sunny day to spoil your time on the beach. Haar is a scandinavian term widely used in Scotland. 'Smirr' is another of those weather words, and means that dense fine drizzle, "rain you can take a bite out of" as someone said!

[nickmo]

Radiation fog or sea fog? Explanation here: http://home.clara.net/franksingleton/fog.html