credit to Google for facts Fog is a low-lying cloud consisting of tiny water droplets or ice crystals suspended in the air near the Earth's surface. It officially occurs when water vapor condenses to a point where horizontal visibility is reduced to less than 1 kilometer (approx. 0.62 miles). If visibility is less restricted, the phenomenon is typically classified as mist or haze.
again credit to google How Fog Forms Fog develops when the air temperature drops to its dew point (the temperature at which air becomes saturated and cannot hold any more water vapor), or when enough moisture is added to the air to reach 100% relative humidity. This causes the invisible water vapor to condense into microscopic liquid water droplets around microscopic particles like dust, salt, or smoke. Common Types of Fog Fog is classified by the unique physical processes that cause it to form: • Radiation Fog: Happens on clear, calm nights when the ground radiates away its heat. The cold ground cools the air immediately above it, forcing moisture to condense. It usually burns off after sunrise. • Advection Fog: Forms when warm, moist air moves horizontally over a cold surface (such as a cold ocean current or snowpack) and cools from below. This type is common along coastlines. • Valley Fog: Occurs when cold, heavy air sinks into valleys and low points overnight. Because it gets trapped under a layer of warmer air (a temperature inversion), valley fog can sometimes linger for days. • Evaporation (or Steam) Fog: Forms when very cold air passes over comparatively warm water. Water evaporates quickly into the cold air layer, saturating it instantly and creating a "steaming" effect. • Freezing Fog: Occurs when liquid fog droplets are supercooled below freezing but remain liquid until they contact a cold surface, instantly forming a layer of icy rime.
