What type of cloud is typically associated with thunderstorms?

Cumulonimbus clouds are the type of cloud most commonly associated with thunderstorms. These clouds are characterized by their large, towering structure that can reach impressive heights in the atmosphere, often extending into the stratosphere. This vertical development occurs because of strong updrafts of warm, moist air, which cools and condenses to form the cloud.

Cumulonimbus clouds are not only responsible for producing heavy rain and intense lightning but also can lead to severe weather phenomena such as hail, strong winds, and tornadoes. Their formation is indicative of atmospheric instability, which is a critical factor in the development of thunderstorms. The presence of these clouds is a clear warning sign of the potential for storm activity, making them a key focus in weather observation and forecasting.

In contrast, the other types of clouds listed generally do not produce the severe weather associated with thunderstorms. Cirrus clouds are high, wispy clouds that signal fair weather and do not indicate storm activity. Stratus clouds are usually low, gray clouds that cover the sky and can bring light rain but lack the vertical development associated with thunderstorms. Nimbostratus clouds produce steady, continuous rain but typically do not exhibit the severe turbulence and electric activity characteristic of thunderstorms.