Which are the only cloud types forecast in the TAF?

The correct choice is Cumulonimbus because this cloud type is specifically noted in Terminal Aerodrome Forecasts (TAFs) due to its significant implications for aviation. Cumulonimbus clouds are associated with severe weather phenomena, including thunderstorms, turbulence, and other hazardous conditions that can greatly affect flight safety. Therefore, it becomes essential to highlight this cloud type in forecasts to ensure that pilots and dispatchers are adequately informed.

In the context of the TAF, other cloud types, such as Stratocumulus, Altocumulus, and Cirrus, are not typically forecasted because they do not typically present the same level of operational impact as Cumulonimbus. While these clouds may be mentioned in certain scenarios, they do not warrant inclusion in the same way as the more dangerous and impactful Cumulonimbus clouds. Thus, recognizing Cumulonimbus in TAFs helps the aviation community prepare for and mitigate risks associated with severe weather.