Which type of ceiling is abbreviated as "BKN"?

The abbreviation "BKN" stands for "Broken," which refers to a specific type of cloud cover in aviation weather reporting. In this case, "broken" indicates that between 5/8 and 7/8 of the sky is covered by clouds. This level of cloud cover can significantly affect flight operations, as pilots need to be aware of visibility and possible flight restrictions based on cloud heights and types.

Understanding cloud cover and its classification is essential for interpreting weather reports and making informed decisions in aviation. In contrast, other terms such as "overcast" refer to 8/8 of the sky being covered, while "visibility" pertains to the clarity of the atmosphere rather than cloud cover. "Variable" describes a situation where cloud cover can change, but it does not have a specific abbreviation like "BKN." Therefore, recognizing "BKN" as meaning "Broken" is key for pilots and meteorologists in assessing weather conditions.