What is the expected weather outcome from moist, unstable air and high surface temperatures?

The outcome of moist, unstable air combined with high surface temperatures is the development of strong updrafts and cumulonimbus clouds. In this scenario, the warm, moist air becomes less dense and begins to rise. As it ascends, the air cools, and the moisture condenses to form clouds, specifically cumulonimbus clouds, which are associated with convective activity.

Cumulonimbus clouds are capable of producing severe weather phenomena, including thunderstorms, heavy rain, and even tornadoes. The strong updrafts within these clouds are crucial for their formation, as they help to lift the warm air high into the atmosphere where it can cool and form precipitation.

In contrast, other options describe weather phenomena that are not consistent with the presence of moist, unstable air at high temperatures. For instance, fog tends to occur in stable, often cool environments, while clear skies suggest a lack of meteorological activity typically associated with high temperatures and moisture. Cold fronts and precipitation can involve different weather dynamics that do not specifically stem from the conditions described in the question. Thus, the choice that indicates strong updrafts and cumulonimbus clouds accurately reflects the consequences of moist, unstable air in hot conditions.