Well to start with fog and mist are the same thing but separated noly by a definition. Mist become fog when the visibility drops below 1000m and vice versa.
Mist and fog is characterstic of the winter months. The amazingly clear winter skies cause sudden drops in temperature,
(u may have noticd when ure nads suddenly drop of)
The moisture in the air just above the ground is then cooled below its dewpoint and condenses forming radiation fog/mist.
Advection fog/mist is when a moist air mass moves onto an area of the surface that is colder than the last and cools the air mass below dewpoint etc.
Mist and fog become frequent in the Autumnal months and especially in the winter due to the cold cloudless nights and moist air.
Help?
Nick
