What is true of clouds over medium altitudes?

Clouds at medium altitudes, typically ranging from about 2,000 to 7,000 meters (6,500 to 23,000 feet), include types such as altostratus and altocumulus. These clouds often appear gray or white and can bring steady precipitation, though they are generally less dense than low-level clouds. They can also indicate changes in weather patterns, often signaling an approaching front. Additionally, medium-altitude clouds can reflect light, creating beautiful sunset colors and optical phenomena like halos.