Final answer:
When an unstable air mass is forced upward, it can be expected to form clouds with considerable vertical development and associated turbulence, such as cumulonimbus clouds, in low-pressure systems.
Step-by-step explanation:
The type of clouds to be expected when an unstable air mass is forced upward is clouds with considerable vertical development and associated turbulence.
This phenomenon typically occurs in low-pressure systems, where the earth's surface atmospheric pressure is lower than that of the surrounding environment, causing moist air to rise and condense into clouds. Cumulus clouds are a clear example of this, formed by water vapor rising due to convection, a process driven by a positive feedback mechanism.
According to storm reports, when the barometric pressure is high, air moves towards regions of lower pressure, sometimes resulting in strong winds and even tornadoes, which are violent rotating columns of air connecting a thunderstorm to the ground. These events are part of larger weather systems that can include the development of clouds with vertical structures, such as cumulonimbus clouds, which can lead to storms and other severe weather patterns.