In METAR, what does "+FC" signify?

In METAR, the notation "+FC" signifies the presence of a funnel cloud that is touching the ground. This notation indicates a very severe weather phenomenon associated with strong thunderstorms, particularly tornadoes.

The "+" prefix indicates that the conditions are intense or severe, and "FC" specifically denotes a funnel cloud, which warrants additional attention from meteorologists and flight dispatchers due to the danger it poses. When forecasting and reporting aviation weather, recognizing such phenomena is crucial for ensuring safety in operations.

It's important for dispatchers and pilots to distinguish between various weather reports, as information about potential funnel clouds that are in contact with the ground can significantly impact flight operations and safety. Understanding these warning signs in the METAR format helps in making informed decisions regarding flight routes and weather avoidance strategies.