How is prevailing visibility reported during specific conditions?

Prevailing visibility is reported in meteorological observations as the greatest horizontal distance at which objects can be clearly discerned. This measurement is typically given in statute miles and can include fractions of a mile, allowing for a more precise reflection of visibility conditions.

While nautical miles are commonly used in aviation, prevailing visibility specifically defaults to statute miles when reported, particularly for meteorological purposes. This choice aligns with the format standardization in weather reporting, making it clearer for meteorologists, pilots, and air traffic controllers to interpret visibility data uniformly.

The other options mention reporting methods that can complicate the interpretation of visibility. For instance, using complex averages or variable distances might confuse the straightforward assessment intended in weather observations. By sticking to a clear and concise representation, such as statute miles and fractions, practitioners can quickly assess and respond to weather conditions affecting visibility.