When a warm air mass meets a cold air mass they don't mix. Instead, the warm less dense air is pushed up over the cold dense air creating the front. As a result, much like when air is forced up over mountains  the warm less dense air cools, and the water vapour condenses into water and falls as raindrops. It can also happen in the united kingdom.

 

When it rains I would wear a rain coat and run to school. I always grab my netbook and my math book. Then I would go to my math class and do my maths. When I finish I eat my lunch. Then I play on my netbook. Then I will do my writing and reading. We have lunch again and we play games again. Then we have writing. Then we go home.

Huntah