Clouds Formation

- Genus Altostratus (As): An opaque or translucent non-convective veil of grey/blue-grey cloud that often forms along warm fronts and around low pressure areas where it may thicken into nimbostratus. Altostratus is usually composed of water droplets but may be mixed with ice crystals at higher altitudes. Widespread opaque altostratus can produce light continuous or intermittent precipitation.
+ Altostratus is not subdivided into species.