During an observation, if visibility varies between 2, 3, and 4 statute miles, what is the reported prevailing visibility?

In aviation weather reporting, prevailing visibility is defined as the greatest distance that can be seen in at least half of the horizon circle, or the visibility observed during a significant portion of the time. In this scenario, the visibility values recorded are 2, 3, and 4 statute miles.

When determining the prevailing visibility from varying values, the report typically selects the most frequently occurring visibility, provided that it is seen for at least half of the time. The figures recorded here suggest that while visibility varied, the 3 statute mile observation represents not only a middle ground between the lowest and highest values but is also the one that indicates a more frequently experienced visibility condition compared to the extremities of 2 miles or 4 miles. Thus the correct prevailing visibility reported is 3 statute miles, which captures the typical condition that a pilot may expect over a definitive period of the observation.

This understanding fits within the parameters of reporting guidelines and methodologies for consistent, standardized aviation weather assessments.