FAA Ground School Practice Test

Which type of clouds is associated with the greatest turbulence?

1. Cumulus

2. Cumulonimbus

3. Stratus

4. Nimbostratus

The correct answer is: Cumulonimbus

Cumulonimbus clouds are associated with the greatest turbulence due to their vertical development and intense weather characteristics. These towering clouds are capable of producing severe weather phenomena such as thunderstorms, heavy precipitation, and strong updrafts and downdrafts. As warm, moist air is rapidly lifted in these clouds, it creates significant instability and turbulence in the atmosphere, which can affect aircraft flying in their vicinity. In contrast, cumulus clouds typically indicate fair weather and exhibit a more moderate level of turbulence compared to cumulonimbus clouds. Stratus clouds are generally associated with stable air and uniform conditions, while nimbostratus clouds, though they can produce steady precipitation, do not feature the violent turbulence seen in cumulonimbus formations. Thus, cumulonimbus clouds stand out as the type that presents the highest potential for turbulence in aviation.