Classification of Clouds:

Following the classification of clouds originally proposed by Luke Howard, there are three main types of clouds: cirrus, stratus, and cumulus.

Cirrus clouds are wispy. curly, or stringy They usually signal fair weather ahead.
Stratus clouds are stratified, or layered, often blanketing the entire sky with a uniform cover.
Cumulus clouds are lumpy or heaped. The weather they bring depends on their height and size