| Summary: | Air may seem hot and humid, hot and dry, damp and cold, or freezing cold. Vigorous weather systems may create abrupt changes when one air mass replaces another with distinct properties. ‘Global weather systems’ explains that air masses can be classified into categories based on the humidity and temperature of their source region: arctic or antarctic continental, polar continental, tropical continental, arctic maritime, polar maritime, tropical maritime, and equatorial maritime. The boundary between two air masses with differing temperatures and humidities is known as a front and there are three forms: cold, warm, and occluded. Jet streams, including Polar jets, Subtropical jets, and the Equatorial Jet Stream, are also discussed.
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