Altocumulus clouds are a type of mid-level cloud that typically form between 2,000 and 7,000 meters (6,500 to 23,000 feet) in the atmosphere. They appear as white or gray patches, often resembling a layer of cotton balls or waves. These clouds can indicate a change in weather, especially if they thicken or darken. These clouds are composed of water droplets and can sometimes produce light precipitation. Altocumulus clouds are often seen in fair weather but can also signal the approach of a storm, making them an important feature in weather forecasting.