| Altostratus translucidus, cloud sheets formed by the rising and cooling of large air masses, often precede advancing storm systems. |
| An elevated portion of a frontal zone forces broad areas of lift, which form clouds decks such as altostratus or cirrostratus. |
| An altostratus cloud usually covers the whole sky and has a gray or blue-gray appearance. |
| You were probably looking at the sun or moon through a layer of altostratus clouds. |
| In the middle troposphere, stratiform clouds are known as altostratus. |
| A weak trough in the upper atmosphere was generating broken layers of stratocumulus based at 2,000 feet and additional overcast layers of altostratus. |
