The words that clear the fog (one step at a time), PeAu 5
R:Touch, D:Inst, T:Ind
Casting this spell reduces the degree of a bank of fog in contact with the caster by one step: impenetrable fog becomes merely thick, thick fog becomes a mist, and a mist is cleared completely.
Base 4 [Reduce the intensity of a weather phenomenon by one step - or destroy a light weather phenomenon], +1 Touch