How does Obstacle effect promote rainfall?

Obstacle effect, also known as orographic lift, occurs when moist air encounters a mountain or elevated terrain. As the air ascends, it cools and condenses, leading to cloud formation and precipitation on the windward side of the obstacle. This process can significantly enhance rainfall in mountainous regions, while the leeward side often experiences drier conditions, known as a rain shadow effect. Thus, the presence of topographical features can play a crucial role in local weather patterns and rainfall distribution.