Which of the following best describes unstable air characteristics?

Unstable air is characterized by vertical motion and turbulence, which often leads to the development of rough air conditions. This vertical movement in unstable air can create various weather phenomena, including thunderstorms and significant turbulence. When the air is unstable, it tends to rise and cool rapidly, which can result in clear or good visibility between the cloud formations, especially during convective activity.

While rough air is typical in unstable conditions, it often comes with good visibility because precipitation isn't necessarily present. In contrast, other options describe characteristics that are consistent with stable air where air tends to be smooth and more stratified, leading to reduced visibility and less turbulent conditions. Therefore, the description of rough air combined with good visibility accurately captures the essence of unstable air behavior.