[Ref Pilot’s Handbook of Aeronautical Knowledge, FAA-H-8083-25B Page 12-15] Fog is a cloud that is on the surface. However, formation of fog could be diabatic/adiabatic process depending on the types (and cloud’s formation is adiabatic process). It typically occurs when the temperature of air near the ground is cooled to the air’s dew point. At … Continue reading Fog