What is ice fog?

Ice fog is characterized as a weather phenomenon that occurs in extremely cold temperatures, typically when the air temperature is below -20 degrees Celsius (-4 degrees Fahrenheit). It forms when water vapor in the air sublimates directly into ice crystals or when supercooled water droplets freeze upon contact with surfaces, creating a dense cloud of tiny ice particles suspended in the air. This leads to significantly reduced visibility, which is a hallmark of ice fog.

The correct choice accurately describes this phenomenon as involving a visibility reduction due to the formation of rime and glaze, which often accompanies the freezing of water droplets in the air. This process is particularly relevant in arctic and subarctic regions where conditions support the formation of ice fog.

In contrast, the other options describe different weather conditions or phenomena that do not pertain specifically to the definition of ice fog. For instance, a type of fog occurring in warm weather does not relate to the frigid temperatures necessary for ice fog formation. Fog during snowstorms could be related but does not define ice fog specifically, since that fog is associated with different mechanisms. Lastly, while fog produced by condensation in cold climates can sometimes involve moisture, it does not accurately convey the unique characteristics of ice fog, particularly in how it affects visibility