For a wind speed of 10 knots, how would this be represented in METAR reports?

In METAR reports, wind speed is represented using a specific format that includes the number of knots followed by the abbreviation "KT" for knots. This standardized format ensures consistency and clarity in aviation weather reporting. Therefore, for a wind speed of 10 knots, the correct representation is "10KT."

The use of "KT" conforms to the practices established by the International Civil Aviation Organization (ICAO), which sets the guidelines for aviation meteorological reporting. It is important to note that while "KTS" might seem like a logical abbreviation for knots, it is not the accepted format in METARs.

The options that simply list the number without the designation or include an extraneous letter (like "Z") do not conform to the established METAR reporting structure, diminishing their correctness in this context.