Cadet Competition Written Practice Exam

Which cloud type is associated with turbulence that affects airplanes?

1. Stratus

2. Cumulus

3. Cirrus

4. Nimbus

The correct answer is: Cumulus

Cumulus clouds are primarily associated with turbulence that can affect airplanes. These clouds usually form due to vertical air currents and are often indicative of instability in the atmosphere. As warm air rises, it cools and condenses into cumulus clouds, which can develop rapidly. Within these clouds, strong updrafts and downdrafts can occur, leading to turbulence that pilots must navigate through. Cumulus clouds, particularly larger and more developed ones, can signal the presence of turbulence associated with convective activity, such as thunderstorms, which can pose significant challenges for flight safety and comfort. In contrast, stratus clouds are typically flat and layer-like, often producing steady precipitation but not significant turbulence. Cirrus clouds are high-altitude clouds, thin and wispy, associated with fair weather but not turbulence. Nimbus clouds, particularly cumulonimbus, can cause turbulence as well; however, cumulus clouds are the more general type associated with aviation turbulence. Therefore, cumulus clouds are the most relevant choice in this context.