In what stage of a thunderstorm do updrafts and precipitation begin?

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The stage of a thunderstorm where updrafts and precipitation begin is the mature stage. During this phase, the storm reaches its most intense point, characterized by strong updrafts that cause the development of large cumulonimbus clouds. As the moisture within the cloud condenses, it leads to heavy rainfall and can also produce severe weather phenomena such as hail and lightning. It's essentially the peak of the thunderstorm lifecycle, where both upward and downward air movements are significant, and precipitation is actively falling from the cloud.

Other stages, such as the cumulus stage, primarily involve the building of the storm without significant precipitation. The dissipating stage occurs after the mature stage when the storm weakens, and updrafts diminish significantly, leading to a decline in precipitation. The development stage isn't a commonly recognized term associated with the lifecycle of thunderstorms and overlaps more so with the cumulus stage where initial convective activity starts.