Final answer:
The ascending branch of a convective current commonly produces a cumulus cloud, which forms through convection and the positive feedback mechanism of water vapor condensation and heat release.
Step-by-step explanation:
The ascending branch of a convective current may produce an upwardly billowing cloud known as a cumulus cloud. Cumulus clouds are caused by water vapor that rises because of convection. This vapor condenses into liquid droplets, forming clouds as it cools in higher altitudes. The rise of these clouds is powered by what is known as a positive feedback mechanism. In this mechanism, the process of water vapor condensing releases heat and causes air to expand and rise, leading to more condensation and lifting of the cloud higher into the atmosphere.
This can lead to the development of thunderheads and sometimes violent storms, including lightning and hail. Specifically, cumulus clouds, when they grow large and towering, can form cumulonimbus clouds, which are associated with heavy rain, thunderstorms, and even hurricanes. Such processes of cloud formation not only take place over the oceans but can also be observed along mountain ranges where moist air from the ocean rises, cools and forms precipitation on the windward side, leading to a 'rain shadow' on the leeward side where dry conditions prevail.