Which two characteristics define a moist, unstable air mass?

A moist, unstable air mass is characterized primarily by its tendency to produce turbulence and showery precipitation. When air is both moist and unstable, it means that the air contains significant moisture, which can be released in the form of precipitation when the air is lifted and cooled. This lifting can lead to the formation of cumulus clouds, often resulting in showers or thunderstorms as the air continues to rise and cool.

Turbulence is also a natural behavior of unstable air masses, as they are prone to vertical mixing and rapid changes in altitude. This turmoil is a result of warm air rising and cooler air sinking, creating an environment that can lead to variable weather conditions, including gusty winds and sudden changes in visibility. Therefore, the combination of turbulence and showery precipitation is indicative of a moist, unstable air mass.