In TAF terminology, what does the abbreviation "BKN" signify?

The abbreviation "BKN" in TAF terminology stands for "broken clouds." This term indicates that there are significant portions of the sky covered by clouds, specifically when the cloud cover is between 5 and 7 tenths. Broken clouds can have implications for aviation, as they can affect visibility and flight operations; pilots need to be aware of the cloud coverage when planning departures and arrivals. This differs from other terms, such as "CLR," which denotes clear skies, or "OVC," which indicates overcast conditions where the sky is completely covered with clouds. Understanding these distinctions is crucial for accurate interpretation of weather forecasts and their impact on flight safety.