Topography( the physicality of environmental features and resources ) affects the climate of a certain region. Clouds form at the windward side, which is a wet area of mountains where moisture and humidity takes over. Lots of trees and plants live here. When the clouds pass the opposite region next to the windward side ( which what we call Leeward side ), they evaporate and start to fade out. Now, this region is dry and rain shadows also occur.
As clouds crosses mountains especially high mountains clouds will disintegrate because it touches the surface of the mountain and  it leave the moisture on the mountain so without moisture there will be disappearance of the cloud