What is the minimum weather requirement for extended trail maneuvers?

The minimum weather requirement for extended trail maneuvers is defined as 3 miles visibility and a discernable horizon. This requirement is crucial because extended trail maneuvers involve flying in close formation with other aircraft, which demands clear visibility to ensure safe and effective execution of the maneuvers. The presence of 3 miles of visibility allows pilots to maintain situational awareness of both their own aircraft and the surrounding environment, facilitating coordinated movements and reducing the risk of collisions.

Additionally, a discernable horizon is vital in these maneuvers as it helps pilots judge their altitude and position relative to other aircraft. Having a clear visual reference aids in the execution of turns, climbs, descents, and maintaining formation integrity. This is particularly important in conditions that involve multiple aircraft operating in close proximity, as even small errors in judgment or situational awareness could have significant consequences.

In contrast, the other options present less favorable weather conditions that do not meet the established requirements for safety during such operations.