Special Clouds
Mammatus Clouds
These are low hanging bulges that droop from cumulonimbus clouds. Mammatus clouds are usually associated with severe weather.
Lenticular Clouds
These clouds are caused by a wave wind pattern created by the mountains. They look like discs or flying saucers that form near mountains.
Fog
This a cloud on the ground. It is composed of billions of tiny water droplets floating in the air. Fog exists if the atmospheric visibility near the Earth's surface is reduced to 1 kilometer or less. Contrails are condensation trails left behind jet aircrafts. Contrails form when hot humid air from jet exhaust mixes with environmental air of low vapor pressure and low temperature. The mixing is a result of turbulence generated by the engine exhaust.
Fractus Clouds
These clouds are small, ragged cloud fragments that are usually found under an ambient cloud base. They form or have broken off from a larger cloud, and are generally sheared by strong winds, giving them a jagged, shredded appearance. Fractus have irregular patterns, appearing much like torn pieces of cotton candy. They change constantly, often forming and dissipating rapidly. They do not have clearly defined bases. Sometimes they are persistent and form very near the surface.
Green Clouds
They are often associated with severe weather. The green color is not completely understood, but it is thought to have something to do with having a high amount of liquid water drops and hail inside the clouds. In the Great Plains region of the U.S., green clouds are associated with storms likely to produce hail and tornadoes.
NB: The British Isles are a group of islands off the north-western coast of continental Europe that consists of the islands of Great Britain, Ireland and over six thousand smaller isles. The British Isles is situated in the North Atlantic and the islands have a total area of approximately 315,159 km2.
