What are the major causes for moving air masses in North America

A major cause for moving air masses in North America is the upper-level winds.

An air mass refers to a large body of air that has identical conditions throughout. It should be noted that air masses take on the condition of the area where they're formed.

Air masses move due to winds and air currents. Moving air masses bring about changes in the weather. The air masses in North America include maritime polar, continental tropical, continental arctic, etc. A major cause for moving air masses in North America is the upper-level winds such as the one that's associated with the jet stream.

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Air masses build when the air stagnates over a region for several days/weeks. To move these huge regions of air, the weather pattern needs to change to allow the air mass to move. One major influence of air mass movement is the upper level winds such as the upper level winds associated with the jet stream.

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