What type of weather event does fog primarily indicate?

Fog primarily indicates low visibility conditions. This type of weather event occurs when there are tiny water droplets suspended in the air, which can obscure vision significantly. The presence of fog results from specific atmospheric humidity levels and temperature inversions, where warm air traps cold air beneath it, fostering the conditions necessary for fog formation.

When fog is present, visibility can be reduced to less than a mile, potentially affecting aviation operations, driving, and outdoor activities. Understanding that fog leads to low visibility is crucial for pilots, air traffic control, and dispatchers, as they must account for these conditions when planning takeoffs, landings, and routes. This awareness is vital for safety and operational decision-making in aviation.

Other weather events listed, such as strong thunderstorms, severe turbulence, and high wind alerts, involve different meteorological phenomena and do not directly relate to the characteristics of fog.