the four most important kinds of clouds

stratus cloud

a stratus cloud is a cloud that brings days of rain.                                                                                                                     

cumulonimbus cloud

a cumulonimbus cloud is a cloud that is a thunderstorm cloud.sometimes these clouds can bring tornados or huricans.
Rozel Kansas Tornadoes (May 18th, 2013)

cirrus cloud

a cloud that is made out of crystals.these clouds are made out of ice crystals because it is where the sun is and it is near space and the water inside freezes.

cumulus cloud

a reagular any day cloud that you make shapes out of.