In METAR, what does "IC" represent?

In a METAR report, "IC" specifically signifies Ice Crystals. This term is used to describe the presence of ice particles in the atmosphere, typically indicating conditions associated with certain types of clouds or weather phenomena. Ice crystals can often form in colder temperatures, particularly when supercooled water droplets freeze upon contact. Recognizing "IC" in the context of a METAR is crucial for pilots and meteorologists, as it provides important information about potential in-flight icing conditions, which can affect aircraft performance and safety.

Understanding this detail enhances situational awareness for flight planning and operations. It is essential for pilots to be able to interpret METAR reports accurately to make informed decisions regarding weather-related hazards during flight.