What remarks would be encoded in column 14 if the surface visibility is 5sm and tower visibility is 1sm?

In the context of aviation weather reporting, column 14 is specifically designated for remarks about visibility conditions. When surface visibility is reported as 5 statute miles (5sm) and tower visibility is 1 statute mile (1sm), accurate encoding of this information is essential for pilots and air traffic controllers to understand the conditions at the airport.

The correct answer reflects the surface visibility being explicitly reported as 5sm, which is a key piece of information that informs those using the weather data of the visibility conditions pilots can expect on the runway. This remark is straightforward and precise, focusing solely on the surface visibility, consistent with standard aviation reporting practices.

In this case, while tower visibility is also a relevant measurement, the encoding of column 14 prioritizes the clarity and straightforward nature of coding the better visibility first. Thus, the other options do not reflect the standard format or reporting protocol, as they either provide incomplete information or incorrectly emphasize the measurement that is less critical for initial assessment at surface level.