When a METAR/SPECI component is not reported, what word should be announced?

In aviation meteorology, when specific components of a METAR (Meteorological Aerodrome Report) or SPECI (Special Weather Report) are not reported, the standard terminology to announce is "Missing." This term is established to provide clarity and consistency in communication, ensuring that all personnel receive the same understanding of the data being presented.

Using "Missing" signifies that while the expectation is that this data should be present as per normal reporting procedures, it is currently absent. This is particularly important in aviation where precise weather information is critical for flight safety, and clarity in communication can prevent misunderstandings.

Other terms like "Unreported," "Unavailable," and "Omitted" might convey a similar sentiment but do not align with the standardized terminology used in aviation. "Unreported" could imply that the data was never gathered or recorded, "Unavailable" suggests a broader context of data not being accessible, and "Omitted" might suggest intentional exclusion. Therefore, "Missing" provides the most accurate and operationally relevant description when components of reported weather data are absent.