What is the correct way to record a wind speed of 15 knots in the report format?

To accurately record a wind speed of 15 knots in the report format, the correct representation is "15KT." This format adheres to standard meteorological practices and FAA reporting guidelines. The abbreviation "KT" stands for knots, which is the unit of measurement used in aviation for wind speed.

Using "15" alone does not specify the unit and could lead to ambiguity, making it unclear whether the measurement refers to knots or another form of speed. The option "15KTS" incorrectly adds an "S" at the end, which is not the acronym universally accepted in this context. Lastly, "15KTZ" introduces an unnecessary character "Z," which is not recognized in standard reporting formats and could be misconstrued. Therefore, the proper format "15KT" ensures clarity and accuracy in weather reporting.