# Radiation Fog - Low lying areas when the ground cools rapidly and cools the air mass directly above it - Most common on a calm, clear, cool night, low winds # Advection Fog - When a warm, moist mass of air moves over a cold surface - Can be common in coastal areas, caused by strong winds with onshore flow with narrow dewpoint temperature spread # Upslope Fog - Moist, stable air mass is forced up sloping land that makes it cooler # Steam Fog - Cold, dry air mass moves over warm water - Water evaporates and creates fog that resembles smoke # Ice Fog - Occurs when the temperature is far below freezing and water vapor forms directly into ice crystals - Usually -25F or colder for it to occur # Precipitation Induced Fog - Evaporation of a cold air mass through the precipitation can cause evaporation and sublimation to create fog - Also called frontal fog