FAA Ground School Practice Test

What is the only cloud type forecast in TAF reports?

1. Stratus

2. Cumulonimbus

3. Nimbostratus

4. Cirrus

The correct answer is: Cumulonimbus

In Terminal Aerodrome Forecast (TAF) reports, the only cloud type specifically forecasted is cumulonimbus. This cloud type is associated with significant weather phenomena including thunderstorms, heavy precipitation, and turbulence. The forecast emphasizes cumulonimbus due to its impact on aviation safety. Pilots need to be particularly aware of the potential hazards posed by this type of cloud, including severe turbulence, wind shear, and lightning. Other cloud types, while they may be observed or present, are generally not forecasted in TAFs because they do not typically indicate as severe conditions as cumulonimbus clouds do. For instance, stratus clouds are often associated with overcast conditions and light precipitation, while nimbostratus clouds can lead to steady, light to moderate rain but are not as hazardous in terms of severe weather. Cirrus clouds, typically high and wispy, do not indicate any significant weather events that would necessitate special mention in aviation forecasts. Thus, cumulonimbus stands out in TAFs as the cloud type that requires careful monitoring for aviation operations.