Which intensity of turbulence is described as being practically impossible to control and violently tosses the aircraft?

The correct answer is described as extreme turbulence, which is characterized by its intensity that can cause an aircraft to be violently tossed around. In this condition, the forces acting on the aircraft are so strong that pilots and crew often find it practically impossible to control the situation effectively. Characteristics of extreme turbulence include abrupt changes in altitude and attitude, which can lead to significant passenger and crew discomfort, and even potential injuries due to the extreme nature of the shaking.

Understanding the levels of turbulence is crucial for pilots when preparing for flight. Light turbulence might cause minor changes in the altitude of the aircraft but is generally manageable. Moderate turbulence could result in noticeable changes in altitude and attitude, requiring pilots to make continuous control adjustments, though it remains within manageable limits. Severe turbulence, while still very challenging and uncomfortable, does not reach the unmanageable extremes of extreme turbulence, as it usually still allows for some control.

Extreme turbulence is situated at the apex of aircraft handling difficulties, leading to the most severe and immediate need for caution from both pilots and control personnel. It is essential for anyone involved in aviation operations to recognize this distinction for safety and preparedness in turbulent weather conditions.