Fog or mist?
 

Does anyone know exactly what the difference is between fog or mist? Is it a visibility thing or is it based on how its formed? any ideas?

Fog
A visible aggregate of minute water particles (droplets) which are based at the Earth's surface and reduces horizontal visibility to less than 5/8 statute mile and, unlike drizzle, it does not fall to the ground.

http://www.met.tamu.edu/class/METAR/...g9-ww.html#FOG

The miracle of google!:D

According to the FAA, fog and mist are the same except that it's not called fog unless the visibility is below 5/8sm or a descriptor is used. So generally, if the vis is very low, it's fog, otherwise, it's mist.