What is the maximum number of layers that can be coded in a manual observation?

The maximum number of layers that can be coded in a manual observation is six. In aviation meteorology, particularly within the METAR reporting system, weather observers document cloud layers by specifying their heights, types, and coverage. The regulation allows for the reporting of up to six layers to capture a comprehensive overview of the sky conditions. This includes clouds of various types and heights, which provide essential information for pilots and air traffic controllers regarding visibility and flight safety.

While the coding system is carefully structured, the limit of six ensures that observers can include significant layers that contribute to the weather picture without overwhelming the report with too many data points. It maintains a balance between detail and clarity in meteorological observations. Therefore, the correct interpretation of manual observations in the context of aviation weather reporting confirms that six layers can be effectively communicated, adhering to established guidelines.