What does "FC" mean in the context of a METAR report?

In the context of a METAR report, "FC" stands for Funnel Cloud. This term is used in aviation meteorology to indicate a weather phenomenon that is potentially indicative of severe weather conditions, particularly tornadoes. A funnel cloud is a rotating, visible condensation funnel that extends from a cumulonimbus cloud and has not yet reached the ground. Identifying funnel clouds in METAR reports is crucial for pilots and air traffic controllers, as it can significantly impact flight safety and decision-making.

Recognizing "FC" in a METAR report allows for immediate awareness of dangerous weather, prompting necessary precautions for flight operations in the affected area. The other options within the choices provided relate to various weather conditions, but they do not align with the specific terminology used in METAR reports, where "FC" uniquely signifies funnel clouds.