What happens when two air masses collide?

  • When two different air masses collide, they don’t mix. They push against each other along a line called air front. 
  • When a warm air mass meets a cold air mass, the warm air rises as it is lighter and the water vapour in it condenses at higher altitudes. This type of front is called a warm front. It generates nimbostratus clouds, which can result in moderate rain. 
  • On the other hand, when a cold air mass catches up with a warm air mass, the cold air slides under the warm air and pushes it upward forming a cold front. As the warm air rises, it cools down rapidly giving rise to cumulonimbus clouds that are often associated with heavy precipitation and storms.

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