What does the code "FG" indicate?

The code "FG" is a meteorological abbreviation that indicates the presence of fog. Fog is characterized by a thick cloud of tiny water droplets suspended in the atmosphere, that can significantly reduce visibility, typically to less than 1 kilometer. It is important for air traffic controllers to recognize this code, as fog can greatly impact aviation safety and operations by causing reduced visibility conditions during takeoff, landing, and while in-flight.

Understanding weather codes like "FG" is crucial for effective communication among air traffic controllers and pilots to ensure that all parties are aware of current weather conditions that could affect flight safety and decision-making processes.