When two air masses meet, they od not mix readily due to differences in temperature and density. The point at which they meet is called a front. A warm front is fouund where warm air is advancing and being forced to override cold air. A cold front occurs when advancing cold air undercuts a body of warm air.
In both cases, the rising air cools and usually produces clouds. These clouds often generate precipiation. Fronts maybe several hundred kilometeres up into the atmosphere. The most notable type of front, the polar front, occurs when warm, moist Tropical maritime air meets colder, drier Polar maritime air. It is at the polar front that many depressions form. they form most readily over oceans in mid-latitudes , and track eatwards brigning cloud and rain to western margins of continents
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