A wind report indicating gusts of 20 knots should be formatted as?

The correct formatting for a wind report indicating gusts of 20 knots is "G20KT" because it follows the standard meteorological convention for reporting wind speed and gusts. The "G" signifies gusts, while the number immediately following it indicates the peak gust speed. The "KT" suffix is used to designate that the wind speed is measured in knots.

Using this format ensures clarity and consistency in weather reporting, which is crucial for pilots and meteorologists who depend on precise information for flight operations and safety. The inclusion of "KT" specifies the unit of measurement, avoiding potential confusion with other units like miles per hour (MPH).

In contrast, other formats provided in the options either lack necessary components or present information in a way that does not conform to standard meteorological practices. For example, the absence of "KT" in the first choice fails to convey the unit of measurement, while the additional numbers in other options imply further gust information that isn't specified or pertinent to the original report. Overall, "G20KT" accurately represents a wind gust of 20 knots, making it the correct choice.