Special clouds are Mammatus clouds which are actually altocumulus, cirrus, cumulonimbus or other types of clouds that have a pouch like shapes hanging out to the bottoms. In these cases, clouds may form or grow as a consequence of certain, often localized generating factors. Orographic clouds get their shape from mountains or hills that force the air to move over or around them. The lenticular clouds are shaped like lenses or almonds. They may get their shape from hilly terrain another type of orographic cloud or just the way the air is raising over a flat terrain.
When moist, warm air rises to a cooler elevation, and water condenses onto microscopic dust-like seeds, bacteria or ash. Air and seeds that updraft the clouds. Every planet with an atmosphere has clouds. That includes the moon. Clouds reflect the suns light, which causes them to appear white. Big clouds are normally made up of water droplets and have a base under 2000 meters. High altitude clouds are usually made up of ice crystals, which can also serve as seeds, and have a base somewhere between 5,500 and 14,000 meters. If those crystals take on moisture, they may become too heavy for updrafts to support, which is what causes rain. So, it makes sense that shooting those so-called seeds” to clouds should make them rain out.
Credit : e-School
Picture Credit : Google
