The type of gray or bluish cloud found at intermediate altitudes and consisting of a thick, dense, extensive layer of ice crystals and water droplets: may cause light precipitation.
A mid-altitude cloud that extends in flat, smooth sheets or layers of varying thickness. Altostratus clouds generally form between 2,000 and 6,100 m (6,560 and 20,000 ft) and often produce long, steady rain showers.
An extended cloud formation of bluish or gray sheets or layers.
Origin of altostratus
- Latin altus high al-2 in Indo-European roots stratus
From American Heritage Dictionary of the English Language, 5th Edition