Which weather phenomenon is formed when warm, moist air rises rapidly, cools, and condenses?

The phenomenon described in the question involves warm, moist air that rises quickly, cools, and then condenses. This process is a fundamental characteristic of thunderstorms. As the warm air rises, it cools to the point where the moisture in it condenses into water droplets, forming clouds. If the conditions are right, this can lead to the development of cumulonimbus clouds, which are characteristic of thunderstorms.

Thunderstorms can produce heavy precipitation, lightning, strong winds, and even hail due to the vigorous upward motion of the warm air. The rapid rising and cooling of air creates instability in the atmosphere, which is essential for the formation of these storms.

Other options like fog and high-pressure systems do not fit the criteria for this phenomenon. Fog forms when the air becomes saturated near the ground, typically under stable conditions, rather than the instability required for thunderstorms. High-pressure systems usually indicate descending air that leads to clear skies rather than rising air. Snowstorms result from different atmospheric conditions involving cold air and moisture but are not characterized by the rapid rise and cooling of warm air, as seen in thunderstorms.