Ice fog is a meteorological phenomenon characterized by the presence of small ice crystals suspended in the air in a condensed form, creating a fog-like appearance. It occurs when extremely cold temperatures, typically below -35 degrees Celsius (-31 degrees Fahrenheit), combine with high humidity levels. This unique combination allows for the formation of ice crystals, which remain suspended in the air, rather than falling to the ground as snow.
Ice fog is usually observed in regions with cold climates, such as polar or subarctic areas, where low temperatures prevail for extended periods. It often occurs at night or during the early morning hours when the air temperature is at its coldest. The resulting fog can reduce visibility, creating hazardous driving and flying conditions.
Ice fog is distinct from other types of fog, such as radiation fog or advection fog, as it is formed solely by the freezing of water vapor into ice rather than through the condensation of water droplets. It is often associated with clear skies and calm weather conditions, as these conditions provide the necessary ingredients for ice crystal formation.
While ice fog can be visually stunning, with its ethereal, ghostly appearance, it can also have adverse effects on transportation, especially air travel, when visibility is severely compromised. In extreme cases, ice fog may result in the closure of airports or interruption of other outdoor activities due to the hazardous conditions it creates.
