When a TAF mentions "CB", what does it refer to?

In the context of TAF, the abbreviation "CB" refers to Cumulonimbus clouds. These are significant for aviation because they indicate the presence of potentially severe weather conditions, including thunderstorms, heavy precipitation, and even turbulence. Cumulonimbus clouds are characterized by their towering, dense structure and can extend high into the atmosphere, often associated with significant weather phenomena.

Understanding the role of Cumulonimbus clouds is crucial for pilots and meteorologists since they can affect flight safety and operations. Recognizing this cloud type helps inform decisions regarding flight paths and potential hazards. Other cloud types mentioned, such as cumulus, cirrus, and nimbostratus, do not convey the same immediate implications of severe weather as Cumulonimbus clouds do, which is why "CB" is specifically highlighted in TAF reports.