When the prevailing visibility is less than 3 statute miles, under what condition will the sector visibility be encoded?

The correct answer is that sector visibility will be encoded when there is one or more reportable values. In the context of limited aviation weather reporting, having a prevailing visibility of less than 3 statute miles necessitates a careful approach to encoding visibility data.

Sector visibility is a specific measurement that helps pilots and air traffic controllers understand conditions in particular areas of the runway or approach paths. When prevailing visibility is reduced, the visibility reports become crucial for safety. Therefore, if there are one or more reportable values indicating the specific conditions in the different sectors, those values must be encoded to provide the most accurate and relevant information for operational decision-making.

This approach ensures that any existing visibility conditions, even if they are below the threshold of 3 statute miles, are communicated appropriately, enhancing situational awareness for pilots and ensuring proper handling of flight operations. The focus is on providing necessary data that can assist in making informed choices regarding takeoffs, landings, and ongoing flights.