Final answer:
When warm, moist, stable air flows upslope, it causes showers and thunderstorms. This process is known as orographic lifting.
Step-by-step explanation:
When warm, moist, stable air flows upslope, it causes showers and thunderstorms. As the air rises, it cools and its water vapor condenses, leading to the formation of clouds and precipitation. This process is known as orographic lifting, and it occurs when air is forced to ascend over a mountain or other elevated terrain.