What should be observed to assess the weight of weather conditions in terms of visibility during approach?

To effectively assess the weight of weather conditions concerning visibility during an approach, it is essential to consider both visibility and ceiling. Visibility refers to how far one can see, which is critical for pilots to safely navigate and land an aircraft. It encompasses various factors such as fog, rain, snow, and any obstructions that could impair sight.

Ceiling, on the other hand, indicates the height of the lowest layer of clouds above the ground level. It is vital for determining if an aircraft can safely approach and land due to the altitude at which it can maintain a clear line of sight to the runway.

Combining both visibility and ceiling offers a comprehensive picture of the weather conditions that might affect a pilot's approach and landing. When visibility is low, or the ceiling is too low, it could lead to challenging flying conditions, subsequently affecting safety and operational decisions. Thus, by focusing on both aspects, pilots are better equipped to make informed judgements about approaching conditions.