In which situation is mechanical turbulence likely to occur?

Mechanical turbulence is typically associated with the interaction of wind with physical obstructions in the environment, such as mountains or buildings. When wind flows over or around these obstacles, it can create disturbances in the airflow, resulting in turbulent conditions. This phenomenon is particularly pronounced near mountain ranges, where the terrain disrupts the smooth flow of air, leading to updrafts, downdrafts, and eddies.

In contrast, areas with clear skies or over open water tend to have more stable conditions, as there are fewer obstructions to disrupt the airflow. High altitude flights, while they may encounter turbulence due to other factors such as wind shear or jet stream activity, are not specifically linked to mechanical turbulence caused by terrain features. Thus, the best context for experiencing mechanical turbulence is indeed near mountain ranges, where the topography significantly affects wind patterns.